US20050144989A1 - Method and system for controlling a drying process - Google Patents
Method and system for controlling a drying process Download PDFInfo
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- US20050144989A1 US20050144989A1 US11/070,184 US7018405A US2005144989A1 US 20050144989 A1 US20050144989 A1 US 20050144989A1 US 7018405 A US7018405 A US 7018405A US 2005144989 A1 US2005144989 A1 US 2005144989A1
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- cleaning
- cleaning fluid
- articles
- fluid
- dry
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F43/00—Dry-cleaning apparatus or methods using volatile solvents
- D06F43/08—Associated apparatus for handling and recovering the solvents
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F43/00—Dry-cleaning apparatus or methods using volatile solvents
- D06F43/08—Associated apparatus for handling and recovering the solvents
- D06F43/086—Recovering the solvent from the drying air current
Definitions
- the invention relates generally to article cleaning apparatuses and more specifically to a method and system for controlling a drying process in a dry cleaning apparatus.
- Solvent based article cleaning systems typically include washing or rinsing systems and drying systems, for cleaning articles such as objects of clothing, drapes, upholstery or similar textiles. Before the articles may be reused after cleaning, they should be substantially devoid of the solvent based cleaning fluid. If the solvent is not substantially removed from the articles, the articles will feel oily to the touch and will require additional cleaning prior to use.
- a dry cleaning device includes a cleaning enclosure suitable for receiving clothing articles and a cleaning fluid, typically a solvent based cleaning fluid, and circuitry coupled to the dry cleaning device for sensing at least one operational parameter of the dry cleaning device and for calculating a retained cleaning fluid content in the articles disposed within the cleaning enclosure based on the at least one operational parameter.
- the circuitry may calculate the amount of cleaning fluid returned to the system during the cleaning process.
- FIG. 1 is a schematic of a dry cleaning device according to an embodiment of the invention.
- FIG. 2 is a graphical illustration of data collected that is related to one embodiment of the instant invention.
- FIG. 4 is a graphical illustration of data collected that is related to another embodiment of the instant invention.
- FIG. 5 is a flow chart that is representative of one method of operation associated with the instant invention.
- a dry cleaning device 10 comprises a cleaning enclosure 12 suitable for receiving clothing articles (not shown) and a cleaning fluid, typically a solvent based cleaning fluid, introduced via an inlet line 14 , as shown in FIG. 1 . Additionally, dry cleaning device 10 further includes circuitry 16 coupled to the dry cleaning device 10 for sensing at least one operational parameter of the dry cleaning device 10 and for calculating a retained cleaning fluid content in the articles disposed within the cleaning enclosure based on at least one operational parameter.
- RMC Retained Moisture Content
- moisture refers to liquids retained in the clothes from the solvent, the water and any combination thereof.
- articles is defined, for illustrative purposes and without limitation, as fabrics, textiles, garments, and linens and any combination thereof.
- solvent based cleaning fluid is defined for illustrative purposes and without limitation, as comprising a cyclic siloxane solvent and, optionally, a cleaning agent. If water is present in a solvent based cleaning fluid, the water is typically present in an amount in a range from about 1 percent to about 8 percent of the total weight of the solvent based cleaning fluid. In another embodiment of the present invention, if water is present in the solvent based cleaning fluid, the water is typically present in an amount in a range from about 1 percent to about 2 percent of the total weight of the solvent based cleaning fluid.
- the cyclic siloxane solvent is decamethylcyclopentasiloxane (hereinafter referred to as D 5 ).
- cleaning agent is defined for illustrative purposes and without limitation, as being selected from the group consisting of sanitizing agents, emulsifiers, surfactants, detergents, bleaches, softeners, and combinations thereof.
- water based cleaning fluid is defined for illustrative purposes and without limitation, as comprising water and, optionally, a cleaning agent.
- cleaning process is defined, for illustrative purposes and without limitation, as utilizing a solvent cleaning process, water cleaning process, and any combination thereof.
- the dry cleaning device 10 further comprises an air management system 18 and a fluid processing system 20 and a controller 22 that is coupled to the cleaning enclosure 12 , the air management system 18 , and the fluid processing system 20 .
- the controller 22 is configured to perform a variety of cleaning processes.
- a cleaning process typically includes at least three main steps, a washing step, a spinning step and a drying step.
- a solvent based cleaning fluid is introduced within the cleaning enclosure 12 and the controller 22 initiates a washing step of the cleaning process.
- the articles are typically agitated together with the solvent based cleaning fluid to clean the articles.
- the solvent based cleaning fluid is drained to the fluid processing system 20 .
- the draining of solvent based cleaning fluid typically recovers about 75%-90% of the solvent based cleaning fluid that was originally introduced. Most of the remaining solvent based cleaning fluid is retained within the articles.
- the articles are submitted to a drying step of the cleaning process.
- the articles are typically tumbled in cleaning enclosure 12 and dried using air management system 18 .
- Hot, dry air is forced over the articles, heating the articles and the solvent based cleaning fluid and vaporizing the solvent based cleaning fluid.
- the vapor flows from the cleaning enclosure 12 to the air management system 18 where the vapor is condensed and the condensate is gravity fed back to the fluid processing system 20 via drain 36 .
- the drying step of the cleaning process typically recovers about an additional 3% to 4.5% bringing the total recovered solvent based cleaning fluid to about 99.5% of the introduced amount.
- the solvent based cleaning solution is relatively expensive and the replacement involves the end-user replacing the solvent, typically via a cartridge insert, it is important to ensure that the recovered amount of the solvent based cleaning fluid is as close to 100 % as reasonably possible.
- the appropriate controls are not available and most systems use an ineffective drying time approximation to determine the amount of residual solvent based cleaning fluid. This drying time approximation is not a robust technique and results in ineffective recovery of the cleaning fluid or alternatively, over-drying of the articles.
- controller 22 is configured to sense operational parameters of the dry cleaning device 10 , calculate the solvent based cleaning fluid content in the articles or alternatively the amount of the solvent based cleaning fluid returned to the fluid processing system 20 , and based on that calculation, control the drying step of the dry cleaning device 10 .
- the operational parameters relate to the operation of dry cleaning device 10
- the operational parameters may include, for example, cleaning fluid inflow or outflow rates, cleaning fluid vapor pressure inside the cleaning enclosure 12 , airflow inflow or outflow rates, airflow inlet and outlet temperatures, various wash cycles (rinse, tumble, drying) times, basket rotation speeds, article weight, cleaning fluid weight and volume, among various others, and various such operational parameters that will occur to those skilled in the art.
- drying process parameters e.g. spin time, airflow temperatures, basket vapor pressure
- the controller 22 is configured to receive and interpret a state of at least one of such operational parameters.
- Controller 22 typically comprises a digital signal processor, configured to receive and execute instructions.
- the controller 22 may further comprise, or be associated with a data storage device (not shown in the figures) for storing various data including instructions and operational parameters.
- the controller 22 includes simulation models for various operating cycles of the dry cleaning device 10 .
- Controller 22 also comprises instructions for correlating an operational parameter of the dry cleaning device to the retained solvent based cleaning fluid content in the articles or the amount of solvent based cleaning fluid returned. Such correlation can be accomplished using many conventional techniques including, for example, using a lookup table or a plot.
- the dry cleaning device 10 includes at least one temperature sensor 110 coupled to the controller 22 and in communication with the air management system 18 such that the temperature sensor 110 senses the temperature of the airflow flowing between the air management system 18 and the cleaning enclosure 12 during the drying step of the cleaning process.
- an inlet temperature of the airflow entering into cleaning enclosure 12 is sensed, and the inlet temperature is correlated to the retained cleaning fluid content by controller 22 .
- an outlet temperature of the airflow exiting the cleaning enclosure 12 is sensed, and the outlet temperature is correlated to the retained cleaning fluid content by controller 22 .
- a difference between the outlet temperature and the inlet temperature of the airflow is calculated, and the difference is correlated to the retained cleaning fluid content by controller 22 .
- the graphical display illustrates the relationship between an airflow inlet temperature, an airflow outlet temperature and the retained cleaning fluid content.
- FIG. 2 illustrates that the inlet and outlet temperatures converge as the retained cleaning fluid content decreases. It is also observed from FIG. 2 that the difference between the inlet and outlet temperatures decreases with decreasing retained cleaning fluid content.
- the rate of variation of the inlet or outlet temperatures, or the difference between the inlet and outlet temperatures, with respect to the retained cleaning fluid content may be empirically determined, and this data may then be used to correlate a current state of these parameters to ascertain a current state of the retained cleaning fluid content in articles, during the drying process by controller 22 .
- the rate of change of the vapor pressure undergoes a slope change right in the region of the 1% RMC location. It is further illustrated in FIG. 3 that the final vapor pressure measurement is not constant and is highly dependent on the type of fabrics being washed.
- the vapor pressure measurements or the calculated rate of change may also be combined with a change over time calculation or a model or both to calibrate and improve the accuracy of the RMC calculation.
- the vapor pressure can be directly measured by pressure sensor 120 or may be inferred based on certain measurements from pressure sensor 120 , for example inferring vapor pressure from infrared measurements.
- the dry cleaning device 10 ( FIG.1 ) includes at least one torque load sensor 130 coupled to the controller 22 and disposed adjacent the rotatable basket 24 to sense the torque load measurement on the motor 26 during the cleaning process.
- One implementation of this embodiment may include rotating the basket at a known rotational velocity after the introduction of articles and prior to introduction of the cleaning fluid to establish a baseline torque load.
- This technique utilizes the fact that the motor 26 , having a known torque curve, requires a specific motor torque to tumble articles and this required torque increases as the weight of the articles increase. With an amount of cleaning fluid being retained in the articles, the article weight increases from a dry state of the articles, and correspondingly the torque required to rotate these articles is higher. This increase in the torque load is therefore indicative of the excess weight in the articles due to the cleaning fluid, and accordingly the torque load required to rotate the motor 26 is correlated by controller 22 to the retained cleaning fluid content.
- the dry cleaning device 10 includes at least one volume sensor 150 coupled to the controller 22 and to the fluid processing system 20 to sense the volume of the returned cleaning fluid during the cleaning process. Since the beginning volume of the cleaning fluid is a known value, the controller 22 would control the drying process to ensure that a certain predetermined volume of cleaning fluid is returned before ending the cleaning process.
- the predetermined volume is in the range between about 99.1 percent of the initial volume of the cleaning fluid to about 99.9 percent of the initial volume of the cleaning fluid. In another embodiment, for example, the predetermined volume is in the range between about 99.3 percent of the initial volume of the cleaning fluid to about 99.7 percent of the initial volume of the cleaning fluid.
- Another method to ensure recovery of a significant percentage of the cleaning fluid is to embed a calibrated model of the drying process within controller 22 to predict RMC based on the physics of the drying process.
- a calibrated model of the drying process would utilize the airflow temperatures flowing into and out of the air management system 18 , as well as the airflow based on a fixed value and pressure drop model of the dry cleaning system 10 . From these known or calculated values, the vapor pressure and RMC can be predicted.
- the RMC can be predicted quite accurately as shown in the FIG. 4 below for six runs with different starting RMC values. This accuracy holds not only for the constant rate portion of the drying cycle, but also for the tail end, where the drying rate is much lower and the final RMC is much closer to the preferred value (typically between 0% and 1%).
- FIG. 5 illustrates, with the help of a flow diagram, a specific method for controlling the drying process, according to one embodiment of the invention.
- the drying process is started SI in the cleaning enclosure 12 , and at least one operational parameter is sensed S 2 . Based on the sensed operational parameter, a value of the retained cleaning fluid content in the articles or the amount of cleaning fluid returned is calculated S 3 .
- An ascertainment S 4 is made, of whether the condition of the retained cleaning fluid content is less than a predetermined value, or the amount of returned cleaning fluid is more than a predetermined value, is met. If the condition is not met, the drying process is continued. If the condition is met, however, the drying process is stopped.
Abstract
A dry cleaning device includes a cleaning enclosure suitable for receiving clothing articles and a cleaning fluid, typically a solvent based cleaning fluid, and circuitry coupled to the dry cleaning device for sensing at least one operational parameter of the dry cleaning device and for calculating a retained cleaning fluid content in the articles disposed within the cleaning enclosure based on the at least one operational parameter. Alternatively, the circuitry may calculate the amount of cleaning fluid returned to the system during the cleaning process.
Description
- This patent application is a continuation-in-part of co-pending and commonly assigned U.S. patent application Ser. No. 10/127,001, entitled “Apparatus and Method For Article Cleaning,” filed Apr. 16, 2002, which Patent Application is hereby incorporated by reference.
- The invention relates generally to article cleaning apparatuses and more specifically to a method and system for controlling a drying process in a dry cleaning apparatus.
- Solvent based article cleaning systems, better known as “dry cleaning” systems, typically include washing or rinsing systems and drying systems, for cleaning articles such as objects of clothing, drapes, upholstery or similar textiles. Before the articles may be reused after cleaning, they should be substantially devoid of the solvent based cleaning fluid. If the solvent is not substantially removed from the articles, the articles will feel oily to the touch and will require additional cleaning prior to use.
- In addition, if the solvent is not substantially recovered after the dry cleaning process is completed, the solvent will need to be replaced more frequently, driving up the cost per usage by the consumer and potentially requiring an overall increase in the periodicity of cartridge or solvent replacement and servicing.
- Currently, to achieve removal of the solvent, conventional systems typically employ a time-based drying cycle that may not accurately indicate the residual amount of the solvent based cleaning fluid in the articles.
- Accordingly, development of improved systems and methods for controlling these drying cycles to ensure solvent recovery in dry cleaning systems is desired.
- A dry cleaning device includes a cleaning enclosure suitable for receiving clothing articles and a cleaning fluid, typically a solvent based cleaning fluid, and circuitry coupled to the dry cleaning device for sensing at least one operational parameter of the dry cleaning device and for calculating a retained cleaning fluid content in the articles disposed within the cleaning enclosure based on the at least one operational parameter. Alternatively, the circuitry may calculate the amount of cleaning fluid returned to the system during the cleaning process.
- These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
-
FIG. 1 is a schematic of a dry cleaning device according to an embodiment of the invention. -
FIG. 2 is a graphical illustration of data collected that is related to one embodiment of the instant invention. -
FIG. 3 is a graphical illustration of data collected that is related to another embodiment of the instant invention. -
FIG. 4 is a graphical illustration of data collected that is related to another embodiment of the instant invention. -
FIG. 5 is a flow chart that is representative of one method of operation associated with the instant invention. - A
dry cleaning device 10 comprises acleaning enclosure 12 suitable for receiving clothing articles (not shown) and a cleaning fluid, typically a solvent based cleaning fluid, introduced via aninlet line 14, as shown inFIG. 1 . Additionally,dry cleaning device 10 further includescircuitry 16 coupled to thedry cleaning device 10 for sensing at least one operational parameter of thedry cleaning device 10 and for calculating a retained cleaning fluid content in the articles disposed within the cleaning enclosure based on at least one operational parameter. - As used herein, the term Retained Moisture Content (“RMC”) is defined as: (weight of the articles with moisture—dry weight of the articles)/(dry weight of articles).
- As used herein, the term moisture refers to liquids retained in the clothes from the solvent, the water and any combination thereof.
- As used herein, the term “articles” is defined, for illustrative purposes and without limitation, as fabrics, textiles, garments, and linens and any combination thereof.
- As used herein, the term “solvent based cleaning fluid” is defined for illustrative purposes and without limitation, as comprising a cyclic siloxane solvent and, optionally, a cleaning agent. If water is present in a solvent based cleaning fluid, the water is typically present in an amount in a range from about 1 percent to about 8 percent of the total weight of the solvent based cleaning fluid. In another embodiment of the present invention, if water is present in the solvent based cleaning fluid, the water is typically present in an amount in a range from about 1 percent to about 2 percent of the total weight of the solvent based cleaning fluid. In one example, the cyclic siloxane solvent is decamethylcyclopentasiloxane (hereinafter referred to as D5).
- As used herein, the term, “cleaning agent” is defined for illustrative purposes and without limitation, as being selected from the group consisting of sanitizing agents, emulsifiers, surfactants, detergents, bleaches, softeners, and combinations thereof.
- As used herein, the term, “water based cleaning fluid” is defined for illustrative purposes and without limitation, as comprising water and, optionally, a cleaning agent.
- As used herein, the term, “cleaning process” is defined, for illustrative purposes and without limitation, as utilizing a solvent cleaning process, water cleaning process, and any combination thereof.
- The
dry cleaning device 10 further comprises anair management system 18 and afluid processing system 20 and acontroller 22 that is coupled to thecleaning enclosure 12, theair management system 18, and thefluid processing system 20. Thecontroller 22 is configured to perform a variety of cleaning processes. A cleaning process typically includes at least three main steps, a washing step, a spinning step and a drying step. - The
cleaning enclosure 12 ofFIG. 1 typically comprises arotatable basket 24 coupled to amotor 26. Therotatable basket 24 has a plurality ofholes 28. Themotor 26 rotates therotatable basket 24. The direct drive orientation of therotatable basket 24 and themotor 26 is provided for illustrative purposes and it is not intended to imply a restriction to the present invention. While thecleaning enclosure 12 is shown comprising arotatable basket 24 and an accompanyingmotor 26, other types of non-rotating cleaning enclosures are contemplated in this invention. - In accordance with one embodiment of the instant invention, upon introduction of articles within
cleaning enclosure 12 and initiation of a cleaning process by a user via a user control interface (not shown), a solvent based cleaning fluid is introduced within thecleaning enclosure 12 and thecontroller 22 initiates a washing step of the cleaning process. The articles are typically agitated together with the solvent based cleaning fluid to clean the articles. After the washing cycle is completed, the solvent based cleaning fluid is drained to thefluid processing system 20. The draining of solvent based cleaning fluid typically recovers about 75%-90% of the solvent based cleaning fluid that was originally introduced. Most of the remaining solvent based cleaning fluid is retained within the articles. - Next, the articles are typically centrifuged in a spinning step in order to recover additional solvent based cleaning fluid. The spinning step typically recovers about an additional 5%-15% of the solvent based cleaning fluid bringing the total recovery to about 95% of the introduced amount.
- Next, the articles are submitted to a drying step of the cleaning process. The articles are typically tumbled in
cleaning enclosure 12 and dried usingair management system 18. Hot, dry air is forced over the articles, heating the articles and the solvent based cleaning fluid and vaporizing the solvent based cleaning fluid. The vapor flows from thecleaning enclosure 12 to theair management system 18 where the vapor is condensed and the condensate is gravity fed back to thefluid processing system 20 viadrain 36. The drying step of the cleaning process typically recovers about an additional 3% to 4.5% bringing the total recovered solvent based cleaning fluid to about 99.5% of the introduced amount. - As discussed above, because the solvent based cleaning solution is relatively expensive and the replacement involves the end-user replacing the solvent, typically via a cartridge insert, it is important to ensure that the recovered amount of the solvent based cleaning fluid is as close to 100% as reasonably possible. Currently, the appropriate controls are not available and most systems use an ineffective drying time approximation to determine the amount of residual solvent based cleaning fluid. This drying time approximation is not a robust technique and results in ineffective recovery of the cleaning fluid or alternatively, over-drying of the articles.
- There are a variety of novel arrangements that can be utilized to ensure that the maximum quantity of the solvent based cleaning fluid is efficiently recovered after a cleaning process is completed, a number of which will be discussed below.
- According to one embodiment of the instant invention,
controller 22 is configured to sense operational parameters of thedry cleaning device 10, calculate the solvent based cleaning fluid content in the articles or alternatively the amount of the solvent based cleaning fluid returned to thefluid processing system 20, and based on that calculation, control the drying step of thedry cleaning device 10. - In general, the operational parameters relate to the operation of
dry cleaning device 10, and the operational parameters may include, for example, cleaning fluid inflow or outflow rates, cleaning fluid vapor pressure inside thecleaning enclosure 12, airflow inflow or outflow rates, airflow inlet and outlet temperatures, various wash cycles (rinse, tumble, drying) times, basket rotation speeds, article weight, cleaning fluid weight and volume, among various others, and various such operational parameters that will occur to those skilled in the art. It is appreciated that drying process parameters (e.g. spin time, airflow temperatures, basket vapor pressure) form a subset of the operational parameters ofdry cleaning device 10. Thecontroller 22 is configured to receive and interpret a state of at least one of such operational parameters. -
Controller 22 typically comprises a digital signal processor, configured to receive and execute instructions. Thecontroller 22 may further comprise, or be associated with a data storage device (not shown in the figures) for storing various data including instructions and operational parameters. In one embodiment, thecontroller 22 includes simulation models for various operating cycles of thedry cleaning device 10.Controller 22 also comprises instructions for correlating an operational parameter of the dry cleaning device to the retained solvent based cleaning fluid content in the articles or the amount of solvent based cleaning fluid returned. Such correlation can be accomplished using many conventional techniques including, for example, using a lookup table or a plot. - In one embodiment of the instant invention, the
dry cleaning device 10 includes at least onetemperature sensor 110 coupled to thecontroller 22 and in communication with theair management system 18 such that thetemperature sensor 110 senses the temperature of the airflow flowing between theair management system 18 and the cleaningenclosure 12 during the drying step of the cleaning process. According to one technique, an inlet temperature of the airflow entering into cleaningenclosure 12 is sensed, and the inlet temperature is correlated to the retained cleaning fluid content bycontroller 22. According to another technique, an outlet temperature of the airflow exiting the cleaningenclosure 12 is sensed, and the outlet temperature is correlated to the retained cleaning fluid content bycontroller 22. According to yet another technique, a difference between the outlet temperature and the inlet temperature of the airflow is calculated, and the difference is correlated to the retained cleaning fluid content bycontroller 22. - More specifically, and with respect to
FIG. 2 , the graphical display illustrates the relationship between an airflow inlet temperature, an airflow outlet temperature and the retained cleaning fluid content.FIG. 2 illustrates that the inlet and outlet temperatures converge as the retained cleaning fluid content decreases. It is also observed fromFIG. 2 that the difference between the inlet and outlet temperatures decreases with decreasing retained cleaning fluid content. The rate of variation of the inlet or outlet temperatures, or the difference between the inlet and outlet temperatures, with respect to the retained cleaning fluid content may be empirically determined, and this data may then be used to correlate a current state of these parameters to ascertain a current state of the retained cleaning fluid content in articles, during the drying process bycontroller 22. - In another embodiment of the instant invention, the dry cleaning device 10 (
FIG. 1 ) includes at least onepressure sensor 120, typically a gas specific vapor pressure sensor, coupled to thecontroller 22 and disposed adjacent to theenclosure 12 such thatpressure sensor 120 is positioned to sense the vapor pressure within cleaningenclosure 12 during the drying step of the cleaning process. The vapor pressure of the cleaning fluid inside the cleaningenclosure 12 is sensed bypressure sensor 120 and correlated bycontroller 22 to the retained cleaning fluid content. As shown inFIG. 3 , the vapor pressure is nearly constant during a portion of the drying process and begins to gradually drop off until finally stabilizing. Using either the empirical data surrounding the stabilization or the rate of change of the vapor pressure, the retained cleaning fluid content can be calculated. In fact, inFIG. 3 , it can be seen that the rate of change of the vapor pressure undergoes a slope change right in the region of the 1% RMC location. It is further illustrated in FIG.3 that the final vapor pressure measurement is not constant and is highly dependent on the type of fabrics being washed. The vapor pressure measurements or the calculated rate of change may also be combined with a change over time calculation or a model or both to calibrate and improve the accuracy of the RMC calculation. As discussed above, the vapor pressure can be directly measured bypressure sensor 120 or may be inferred based on certain measurements frompressure sensor 120, for example inferring vapor pressure from infrared measurements. - In another embodiment of the invention, the dry cleaning device 10 (
FIG.1 ) includes at least onetorque load sensor 130 coupled to thecontroller 22 and disposed adjacent therotatable basket 24 to sense the torque load measurement on themotor 26 during the cleaning process. One implementation of this embodiment may include rotating the basket at a known rotational velocity after the introduction of articles and prior to introduction of the cleaning fluid to establish a baseline torque load. This technique utilizes the fact that themotor 26, having a known torque curve, requires a specific motor torque to tumble articles and this required torque increases as the weight of the articles increase. With an amount of cleaning fluid being retained in the articles, the article weight increases from a dry state of the articles, and correspondingly the torque required to rotate these articles is higher. This increase in the torque load is therefore indicative of the excess weight in the articles due to the cleaning fluid, and accordingly the torque load required to rotate themotor 26 is correlated bycontroller 22 to the retained cleaning fluid content. - In another embodiment of the invention, the
dry cleaning device 10 includes at least oneweight sensor 140 coupled to thecontroller 22 and to thefluid processing system 20 to sense the weight of the returned cleaning fluid during the cleaning process. Since the beginning weight of the cleaning fluid is a known value, thecontroller 22 would control the drying process to ensure that a certain predetermined weight of cleaning fluid is returned before ending the cleaning process. In one embodiment, for example, the predetermined weight is in the range between about 99.1 percent of the initial weight of the cleaning fluid to about 99.9 percent of the initial weight of the cleaning fluid. In another embodiment, for example, the predetermined weight is in the range between about 99.3 percent of the initial weight of the cleaning fluid to about 99.7 percent of the initial weight of the cleaning fluid. - In another embodiment of the invention, the
dry cleaning device 10 includes at least onevolume sensor 150 coupled to thecontroller 22 and to thefluid processing system 20 to sense the volume of the returned cleaning fluid during the cleaning process. Since the beginning volume of the cleaning fluid is a known value, thecontroller 22 would control the drying process to ensure that a certain predetermined volume of cleaning fluid is returned before ending the cleaning process. In one embodiment, for example, the predetermined volume is in the range between about 99.1 percent of the initial volume of the cleaning fluid to about 99.9 percent of the initial volume of the cleaning fluid. In another embodiment, for example, the predetermined volume is in the range between about 99.3 percent of the initial volume of the cleaning fluid to about 99.7 percent of the initial volume of the cleaning fluid. - Another method to ensure recovery of a significant percentage of the cleaning fluid is to embed a calibrated model of the drying process within
controller 22 to predict RMC based on the physics of the drying process. Such a model would utilize the airflow temperatures flowing into and out of theair management system 18, as well as the airflow based on a fixed value and pressure drop model of thedry cleaning system 10. From these known or calculated values, the vapor pressure and RMC can be predicted. The RMC can be predicted quite accurately as shown in theFIG. 4 below for six runs with different starting RMC values. This accuracy holds not only for the constant rate portion of the drying cycle, but also for the tail end, where the drying rate is much lower and the final RMC is much closer to the preferred value (typically between 0% and 1%). - An additional measure to ensure recovery of cleaning solution is to lock the system user out of the cleaning
enclosure 12 until the RFC calculated bycontroller 22 is less than a predetermined value, for example, 0.5%. -
FIG. 5 illustrates, with the help of a flow diagram, a specific method for controlling the drying process, according to one embodiment of the invention. The drying process is started SI in the cleaningenclosure 12, and at least one operational parameter is sensed S2. Based on the sensed operational parameter, a value of the retained cleaning fluid content in the articles or the amount of cleaning fluid returned is calculated S3. An ascertainment S4 is made, of whether the condition of the retained cleaning fluid content is less than a predetermined value, or the amount of returned cleaning fluid is more than a predetermined value, is met. If the condition is not met, the drying process is continued. If the condition is met, however, the drying process is stopped. - While only certain features of the invention have been illustrated and described herein, many modifications and changes will occur to those skilled in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.
Claims (16)
1. A dry cleaning device, comprising:
a cleaning enclosure configured to receive articles and a cleaning fluid; and
circuitry coupled to said dry cleaning device for sensing at least one operational parameter of said dry cleaning device and calculating a retained cleaning fluid content in said articles based on said at least one operational parameter.
2. A dry cleaning device according to claim 1 , wherein said circuitry controls a drying process for said dry cleaning device based on the calculated retained cleaning fluid content.
3. A dry cleaning device according to claim 1 , wherein said circuitry includes at least one sensing device.
4. A dry cleaning device according to claim 3 , wherein said at least one sensing device is a temperature sensor.
5. A dry cleaning device according to claim 4 , further comprising an air management system for circulating an airflow through said cleaning enclosure and wherein said temperature sensor senses a temperature of said airflow and said circuitry calculates the retained cleaning fluid content based on said sensed temperature.
6. A dry cleaning device according to claim 3 , wherein said at least one sensing device is a vapor pressure sensor to sense a vapor pressure of the cleaning fluid in the cleaning enclosure and said circuitry calculates the retained cleaning fluid content based on said sensed vapor pressure.
7. A dry cleaning device according to claim 3 , wherein said cleaning enclosure includes a rotatable basket and said at least one sensing device is a torque load sensor to sense a torque load measurement while said basket rotates with said articles at a known speed and said circuitry calculates the retained cleaning fluid content based on said sensed torque load measurement.
8. A dry cleaning device according to claim 3 , further comprising a fluid processing system configured to receive the cleaning fluid after usage within the cleaning enclosure, wherein said at least one sensing device is a weight sensor adapted to sense the weight of said cleaning fluid within said fluid processing system and said circuitry calculates the retained cleaning fluid content based on said sensed weight measurement.
9. A dry cleaning device according to claim 3 , further comprising a fluid processing system configured to receive the cleaning fluid after usage within the cleaning enclosure, wherein said at least one sensing device is a volume sensor adapted to sense the volume of said cleaning fluid within said fluid processing system and said circuitry calculates the retained cleaning fluid content based on said volume measurement.
10. A dry cleaning device according to claim 1 , wherein said circuitry is configured to provide a calibrated model that is representative of a drying process and said circuitry calculates the retained cleaning fluid content based on said model in conjuction with said sensed operational parameters.
11. A method for controlling a drying process in a dry cleaning device that uses a cleaning fluid to clean articles, the method comprising:
sensing at least one operational parameter of the dry cleaning device;
calculating a retained cleaning fluid content in the articles based on the sensed operational parameter; and
controlling the drying process based on the calculated retained cleaning fluid content.
12. A dry cleaning device for cleaning articles with a solvent based cleaning fluid, comprising:
a cleaning enclosure configured to receive the articles;
a fluid processing system that supplies a solvent based cleaning fluid to the cleaning enclosure;
an air management system that supplies an airflow to the cleaning enclosure;
at least one sensing device configured to sense an operational parameter of the dry cleaning device; and
a controller responsive to the at least one sensing device, wherein the controller is configured to calculate the retained solvent based cleaning fluid content in the articles based on the sensed operational parameter and control the drying process based on the calculated retained cleaning fluid.
13. A dry cleaning device for cleaning articles with a solvent based cleaning fluid, comprising:
a means for receiving articles;
a means for introducing said solvent based cleaning fluid into said means for receiving articles upon introduction of said articles;
a means for determining at least one operational parameter of said dry cleaning device; and
and a means for calculating a retained solvent based cleaning fluid content in said articles based on said at least one operational parameter.
14. A dry cleaning device for cleaning articles with a solvent based cleaning fluid in accordance with claim 13 , further comprising means for controlling a drying process for said dry cleaning device based on the calculated retained solvent based cleaning fluid content.
15. A dry cleaning device for cleaning articles with a solvent based cleaning fluid, comprising:
a cleaning enclosure configured to receive the articles;
a fluid processing system that supplies a solvent based cleaning fluid to the cleaning enclosure;
an air management system that supplies an airflow to the cleaning enclosure;
at least one sensing device configured to sense an operational parameter of the dry cleaning device; and
a controller responsive to the at least one sensing device, wherein the controller is configured to calculate the amount of returned solvent based cleaning solution based on the sensed operational parameter and control the drying process based on the calculated returned cleaning fluid.
16. A dry cleaning device in accordance with claim 1 , wherein said circuitry locks the cleaning enclosure until the calculated retained fluid content is less than a predetermined value.
Priority Applications (1)
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US11/070,184 US20050144989A1 (en) | 2002-04-22 | 2005-03-02 | Method and system for controlling a drying process |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/127,001 US7308808B2 (en) | 2002-04-22 | 2002-04-22 | Apparatus and method for article cleaning |
US11/070,184 US20050144989A1 (en) | 2002-04-22 | 2005-03-02 | Method and system for controlling a drying process |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/127,001 Continuation-In-Part US7308808B2 (en) | 2002-04-22 | 2002-04-22 | Apparatus and method for article cleaning |
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US20050144989A1 true US20050144989A1 (en) | 2005-07-07 |
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US11/070,184 Abandoned US20050144989A1 (en) | 2002-04-22 | 2005-03-02 | Method and system for controlling a drying process |
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US (1) | US20050144989A1 (en) |
Citations (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3258847A (en) * | 1962-12-06 | 1966-07-05 | Engelhard Hanovia Inc | Dry cleaning machine |
US4111034A (en) * | 1976-04-08 | 1978-09-05 | Hubner Rolf H | Apparatus for monitoring the solvent content of air |
US4164538A (en) * | 1977-11-11 | 1979-08-14 | American Sterilizer Company | Load conditioning control method for steam sterilization |
US5166592A (en) * | 1989-08-11 | 1992-11-24 | Whirlpool Corporation | Motor diagnostics and electronic control for a clothes dryer |
US5172490A (en) * | 1991-02-28 | 1992-12-22 | Kabushiki Kaisha Toshiba | Clothes dryer with neurocontrol device |
US5290511A (en) * | 1989-11-24 | 1994-03-01 | Duncan Newman | Method for steam sterilization of articles |
US5347727A (en) * | 1991-12-23 | 1994-09-20 | Goldstar Co., Ltd. | Method for controlling combined sensing type clothes dryer |
US5739534A (en) * | 1996-11-18 | 1998-04-14 | Raytheon Corporation | Methods and apparatus for detecting fluids |
US5899005A (en) * | 1997-03-13 | 1999-05-04 | General Electric Company | System and method for predicting the dryness of clothing articles |
US5943721A (en) * | 1998-05-12 | 1999-08-31 | American Dryer Corporation | Liquified gas dry cleaning system |
US6122840A (en) * | 1998-11-18 | 2000-09-26 | General Electric Company | Systems and methods for determining drying time for a clothes dryer |
US6141887A (en) * | 1997-03-13 | 2000-11-07 | General Electric Company | System and method for sensing the dryness of clothing articles |
US20020004995A1 (en) * | 2000-06-05 | 2002-01-17 | France Paul Amaat | Systems for controlling a drying cycle in a drying apparatus |
US6355072B1 (en) * | 1999-10-15 | 2002-03-12 | R.R. Street & Co. Inc. | Cleaning system utilizing an organic cleaning solvent and a pressurized fluid solvent |
US6446357B2 (en) * | 2000-06-30 | 2002-09-10 | Whirlpool Corporation | Fuzzy logic control for an electric clothes dryer |
US6493963B1 (en) * | 2001-05-25 | 2002-12-17 | Maytag Corporation | Method and apparatus for dryness detection in a clothes dryer |
US6691536B2 (en) * | 2000-06-05 | 2004-02-17 | The Procter & Gamble Company | Washing apparatus |
US6764994B1 (en) * | 1993-08-10 | 2004-07-20 | Biopharm Gesellschaft Zur Biotechnologischen Entwicklung Von Pharmaka Mbh | Growth/differential factor of the TGF-B family |
US6776801B2 (en) * | 1999-12-16 | 2004-08-17 | Sail Star Inc. | Dry cleaning method and apparatus |
US6857437B2 (en) * | 2003-06-18 | 2005-02-22 | Ekc Technology, Inc. | Automated dense phase fluid cleaning system |
US7146749B2 (en) * | 2002-04-22 | 2006-12-12 | The Procter & Gamble Company | Fabric article treating apparatus with safety device and controller |
-
2005
- 2005-03-02 US US11/070,184 patent/US20050144989A1/en not_active Abandoned
Patent Citations (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3258847A (en) * | 1962-12-06 | 1966-07-05 | Engelhard Hanovia Inc | Dry cleaning machine |
US4111034A (en) * | 1976-04-08 | 1978-09-05 | Hubner Rolf H | Apparatus for monitoring the solvent content of air |
US4164538A (en) * | 1977-11-11 | 1979-08-14 | American Sterilizer Company | Load conditioning control method for steam sterilization |
US5166592A (en) * | 1989-08-11 | 1992-11-24 | Whirlpool Corporation | Motor diagnostics and electronic control for a clothes dryer |
US5290511A (en) * | 1989-11-24 | 1994-03-01 | Duncan Newman | Method for steam sterilization of articles |
US5172490A (en) * | 1991-02-28 | 1992-12-22 | Kabushiki Kaisha Toshiba | Clothes dryer with neurocontrol device |
US5347727A (en) * | 1991-12-23 | 1994-09-20 | Goldstar Co., Ltd. | Method for controlling combined sensing type clothes dryer |
US6764994B1 (en) * | 1993-08-10 | 2004-07-20 | Biopharm Gesellschaft Zur Biotechnologischen Entwicklung Von Pharmaka Mbh | Growth/differential factor of the TGF-B family |
US5739534A (en) * | 1996-11-18 | 1998-04-14 | Raytheon Corporation | Methods and apparatus for detecting fluids |
US5899005A (en) * | 1997-03-13 | 1999-05-04 | General Electric Company | System and method for predicting the dryness of clothing articles |
US6141887A (en) * | 1997-03-13 | 2000-11-07 | General Electric Company | System and method for sensing the dryness of clothing articles |
US5943721A (en) * | 1998-05-12 | 1999-08-31 | American Dryer Corporation | Liquified gas dry cleaning system |
US6122840A (en) * | 1998-11-18 | 2000-09-26 | General Electric Company | Systems and methods for determining drying time for a clothes dryer |
US6355072B1 (en) * | 1999-10-15 | 2002-03-12 | R.R. Street & Co. Inc. | Cleaning system utilizing an organic cleaning solvent and a pressurized fluid solvent |
US6776801B2 (en) * | 1999-12-16 | 2004-08-17 | Sail Star Inc. | Dry cleaning method and apparatus |
US6691536B2 (en) * | 2000-06-05 | 2004-02-17 | The Procter & Gamble Company | Washing apparatus |
US20020004995A1 (en) * | 2000-06-05 | 2002-01-17 | France Paul Amaat | Systems for controlling a drying cycle in a drying apparatus |
US6840069B2 (en) * | 2000-06-05 | 2005-01-11 | Procter & Gamble Company | Systems for controlling a drying cycle in a drying apparatus |
US6446357B2 (en) * | 2000-06-30 | 2002-09-10 | Whirlpool Corporation | Fuzzy logic control for an electric clothes dryer |
US6493963B1 (en) * | 2001-05-25 | 2002-12-17 | Maytag Corporation | Method and apparatus for dryness detection in a clothes dryer |
US7146749B2 (en) * | 2002-04-22 | 2006-12-12 | The Procter & Gamble Company | Fabric article treating apparatus with safety device and controller |
US6857437B2 (en) * | 2003-06-18 | 2005-02-22 | Ekc Technology, Inc. | Automated dense phase fluid cleaning system |
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