CA1213863A - Temperature-actuated flow control device - Google Patents
Temperature-actuated flow control deviceInfo
- Publication number
- CA1213863A CA1213863A CA000446768A CA446768A CA1213863A CA 1213863 A CA1213863 A CA 1213863A CA 000446768 A CA000446768 A CA 000446768A CA 446768 A CA446768 A CA 446768A CA 1213863 A CA1213863 A CA 1213863A
- Authority
- CA
- Canada
- Prior art keywords
- temperature
- fluid
- metallic element
- switching chamber
- flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/08—Air or gas separators in combination with liquid meters; Liquid separators in combination with gas-meters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
- G01N2001/2261—Sampling from a flowing stream of gas in a stack or chimney preventing condensation (heating lines)
Abstract
TEMPERATURE-ACTUATED FLOW CONTROL DEVICE
ABSTRACT OF THE DISCLOSURE
A temperature-actuated flow control device has a fluid inlet connected to an exhaust line with a con-trol chamber located therebetween. The control chamber has a free-floating bi-metallic circular element which is flexed in response to temperature changes between a first position stopping flow between the inlet and the exhaust line and a second position opening the flow therebetween. This flow control device, when adapted-to a gas sampling system, allows the bi-metallic ele-ment remain in a first position at normal operating temperatures to permit the continuous sampling of the sample gas. Whenever the temperature falls below the dew point of the sample gas, the bi-metallic element re-turns to its second position to stop the sampling of sample gas by the system to prevent condensation in the system.
ABSTRACT OF THE DISCLOSURE
A temperature-actuated flow control device has a fluid inlet connected to an exhaust line with a con-trol chamber located therebetween. The control chamber has a free-floating bi-metallic circular element which is flexed in response to temperature changes between a first position stopping flow between the inlet and the exhaust line and a second position opening the flow therebetween. This flow control device, when adapted-to a gas sampling system, allows the bi-metallic ele-ment remain in a first position at normal operating temperatures to permit the continuous sampling of the sample gas. Whenever the temperature falls below the dew point of the sample gas, the bi-metallic element re-turns to its second position to stop the sampling of sample gas by the system to prevent condensation in the system.
Description
..
.
.. `.~ . . I
-- 1 ~ Case 4534 TEMPERATURE-ACTU~TED FL~W CO ~ ROL D~VI OE
. TE~HNIC~L FIELD . -i Thf~ invention relates to flow con~rol deviee3 in generai and i~ particular to a new and useful ga~ lo~
~ontrol device for ga~ analyzing apparatus u~ilizing a bi-metal ~w~tch to control ga3 flow in ~h2 apparatu~
BACKGROUND ART
The presen~ inYention has application ~o the con-trol of all fluids which requ~re a reduction of fluid flow or a shut-off fluld flow due to critical ~empera- ¦
ture changes in th~ fluid. l~e lnven~ion ha~ particular application in the oonstruction of g~8 analyzers w~ich use heated sampling ~ystems to prevent liquid condensa-15 tion in the system and w~ich syst~s draw a ga~ through . th~ syst~m by using an asplrator ~o affec~ the ~as flow.
It ~s desirabl~ in ~uch de~ice~ ~o int~rrup~ the sspira-tio~ of ga8 flow when the ~a~ sample tempera~ure falls below ~he d~w point oausing condensation within the apparatu~. Know~ device~ u~e a ~emperature sensor ~nd a solenoid valve to control the asplra~ng air stream by shu~ting it on and off. Such 2n ar~angement involves expcnsive electrlcal circuitry and connec~ion~ a~ well a~ piping which frequen~ly limits i~ applicab~lity due to ambienP effect~ on the valv~ and electr~c~l co~po~t8 .
, " S ~ Y OF THE INYENTI~
, In accordance wlth the present invent~on, the flow of an aspirating gas and, he~ce, the flow of a con~rol ga~ i8 regulated by use of a snap-acting bi-metallic . . switch which i8 mounted ln a chamber of an aspirator in-let pa~age to thereby control ~he fl~w of the aspirated 8as easily and automaticslly~ The bl-metallic switch i8 - ~
a disc or ~imilar element w~ich ha~ a~ area which over- ~i lies and closes ~he a~p~rator air pas~age whene~er the temperature of operatio~ i~ no in a satisfactory rang2.
The bi-metal element i8 chQsen to ach~eve the desired con~
trol in the predetermined temperature range and is lo-. cated i~ tha aspirated chamber where it is not appreciably 'I
sffected by the aspirating air. The bl-metal elemen~ pro-v~des excellent control wi~hin ~he deslred tempera~ure range of the s~mple. The bi-~e~al switch i8 made free- -float~ng in a chamber having a helght and diameter larger than the switch. The chamber ~urace hav~ng the control-led opening i~ ~apered to make ~he swltch self-aligning with the opening thus insuring positi~e clo~ure and re peatability. Thu8, a simple bi-metallic device will ac-complish ~he same functlon a~ an electrical con~rol valve but in a less espensive and easily-installed manner.
Accordingly, ~t 1~ an ob3ect of the present lnven~
tion to prvvide an improved ~emperature actuator fluid - cont~ol in w~ch a sampl~ ga~ flow i~ regulated by the flow of an asp~rating gas and this a~plra ing gaB 1~w i~ controlled by a bi-metalllc element whi~h clo~es off the fl~w whenever a desired ga~ ~emperature i~ ~ot ach~eved.
Yet ano~her obiect of the present lnvention ~8 to provide a ga~ sampllng d~vice w~ich include~ a free-floating bi-metallle switch mounted in a tapered area having a switch-controlled opening to make the switch self-center-ing with respect to the opening.
Still another object of the present invention is to provide a temperature actuated fluid flow control for a gas sampling device having a free-floating bi-metallic switch which has sym-metrical gas flow around the switch to insure repeatable switch action.
The invention consists of a temperature-actuated fluid flow control device comprising: a fluid inlet; an exhaust line for the fluid connected to said fluid inlet; means for inducing flow of fluid into said fluid inlet and out said exhaust line;
a switching chamber located between said fluid inlet and said exhaust line; a bi-metallic flexible element disposed in said switching chamber and being flexibly responsive to temperature change to move between a first flexed position wherein the element stops the flow of fluid between said fluid inlet and said exhaust line and a second flexed position opening flow between said fluid inlet and said exhaust line; and said switch-ing chamber being larger than said bi-metallic element to make said bi-metallic element free-floating in said switching chamber.
The foregoing and other objects of novelty which charac-teri2e the present invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure.
For a better understanding of the present invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which a preferred embodiment of the invention is illustrated.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a partial sectional view of a gas sampling device constructed in accordance with the present invention.
Fig. 2 is an expanded view of a bi-metallic element in the open flow position and the mounting area for same of the device of Fig. 1.
-3a-Fig. 3 is a top view of the bi-metallic switch and mount-ing area of Fig. 2.
Fig. 4 is a graphical representation of the operation of the device of Fig. 1 in response to temperature change.
DETAII,ED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawings wherein the showings are for purposes of detailing a preferred embodiment of the...
in~ention but not lim~ting the invention thereto, Figs.
1 through 3 show a tempexature actuat~d fluid flow con-trol device generally des~gnated 10 which in ~he embodl- ?
5 men~ illustra~ed comprises ~ device for sampling a ~a~.
The device 10 include~ an inle~ passage l~ for the inflow of a gas sample into a heated block or housing 14 ~h~ch contains a separate sampllng chamber 16 ha~ing a gas sen~lng device 18 w~ich may, for example, include ~eans 10 for determining the ~ype of gas and possibly the quantity . of such ga~ in a particular sample fl~. As shownJ the gas sensor 18 ~ connected through electrical linPs 20 to suitable instruments for determinin~ the desired ga~ .
sample charaeteris~ics. The sample gas then flows 15 through a reduced flow area section 20 followed by an aspirating cham~er 22 and then out through an exhaust or discharge area 24. The flow of the sample gas through the inlet 12 i8 controlled by the flow of an aspirating gas which is admlt~ed in the direction o~ an arrow 26 20 into an aspirating gas fl~w control ehamber 28 through an opening 30 into the chamber 22 and then ou~ the exhaust 24. This flow induces the flow of ~he ~ample gaR through the inle~ 12.
. The flow of the sample gas in the direction of 2S arrow 32 is con~rolled by the flow of ~he aspirated g~
in the direc i~n of.the arrow 26 through the opening 30.
A ~i-metallic el~ment-34 is disposed in th~ aspirating cham~er 28 and it may be flexed from th~ solid line indicated posltion to the do~ted line indicated p~sitlon 30 in aceordance ~ith predetermined temperature cha~e~ of th~ aspirating ga~. The bl-metallic element i~ made up of metsls having characterIstic~ whlch will permit it to operate in the desired temperature range and it i~
advantageou~ly in t~e form of a disc a~ may be best se~n 35 in Figs~ 2 and 3~ The cons~ruction may be of any sha~e such that ~c will close the openin~ 30 when th~ tempera-- ture i~ other than a correct operating te~perature.
In the embodiment o the inventlon shown as a gas 5 analyzer when the block 14 i8 at proper operating temper-ature the bi-metallic element 34 will remain in ~çhe. solid llne position and permi~ flow of aspirat~ng g~ and ~n- .
flow of ~he sample gas ln the directio~ of the arrow 32 by allowing air aro~d its periphery to e~cit il~tO tha 10 pas~age 30. If ~che bloclc temperature CooiR below the d~-sired ~cemperature, th~ bi-metallic elemenlt abruptly changes ts: the dot~ced lir~e position thereby blocking air flow to the pas~age 30 arld the aspira~cor to thereby shut - off t:he ~ampling proces~- . In ~o doing 9 it eliminstes 15 the poss~ility of condensate forming in the sample gas pas~ageways. The bi-metallic element 34 is fabricated by bonding two metal~ ~co~ether which ha~e differen~c thermal coe~ficlent~ of expan~ion. By proper s~lectlon of metals and diameters and ~izesD etc., ~che element i~
20 made to deflect abruptly in order to rapidly cause di~-placemen~ or exert forces.
As may be better seen wit~ partlcular reference to F'ig8. 2 through 4, the bi-metallic elemer~t 34 i~ made to be free-float~ing wlthin ~he~ ohamber ~. Free~
25 float:ing in the present e~bodiment is indlcated to have a clearance of approxlmately 0 . 010 lnche3 along the radius of che chamber 28 when the bl-metallic elemen~s 34 i8 of a diame~cer apprsximately 0 . 625 inehes in its Fig. 2 po~ltion. The hei)3ht c~earance i8 approxima~ely 0.008 30 inches on the chamber height H of 0.032 inche~. Thi~
a~ility of the bi~metallic elemen~ 34 to floa~ withln the chamber 28 preveR~ it rom being ~ammed.in unde~lred posi~ions as well a~ provide~ an adequate leakagç!! of air from the inlet 26 ~o ~he passa$e 30. To make ~che b~-35 metallic element 3b, ~elf-eent~rlng wi~h respect to the ~ 3~3 ~ S~
- . . . .
- . . . . .
passage 30, a tapered sect~on 40 18 formed a~ the ~: bottom of the chamber 28 which may be best described . -as a tapered section 40 hav~ng the passage 30 a~ it8 center and anglsd towards the pas~ag~ 30. The taper i8 approximately 0.004 inches sn~ this ~aper i8 sufficient to make the free-floating bi-metallic elem~nt 34 self- -centeri~g with respect to the pa~age 30.
: As ma~ be best een with p~rtlcular reference to Fig~. 2 and 3, the tapered ~e~tion 40 ~8 fonmed betwee~
- center~ of a pair of eounterbored sections 36 and 36t located along a diameter of ~he tapered section 40 and the center o~ passage 30. The counterbores 36 and 36 t are approx~mately 0.156 lnches ln diameter and are ap-proximately 0.125 inehes deep. The purpo~e of the~ecounterbores i~ to prov~de unrestricted flow resulting - ln a swift and large volume of air flowing from the in-let 28 to both sides of the bi-metallic element 34, thus making-it speedily respon~ve t~ temperature changes by maintaining a substantial volume of the same air on bot~ -sides of the bi-metallic element 34.
. The bl-metallic element 34 ~s manufactured to specification as is known by those skilled in ~he ar~
to ha~e a movement of approx~mately 0.02 inche~ between a snap te~peraturc a~ static flow o approximately 380F~
~nd a reset temperature of approx~mately 33l:1F~
As may be bes~ described wi~h partlcular reference to Fig. 4, which describes an actual snapping o~eratls:~n of the b~-metallio element w~th`time over a ~eries of 30 temperature cycle8 las~cing approxi~ately l . 5 hr~.Jcys~
From the curve, it may be seen ~hat flo~ from port ~8 to the pa~sage 30 remains at approximately O per cent over a time interval until the temperature in passage 28 re~che~ approxima~ely-377F., at which ~ime the bi-metallic element 34 8nap8 to its Fi~. 1 sol~d line , ~l~13B63 positibn sllowing lOO per cent of the flo~ fro~ thepa~sag~ 28 to the passage 30. Rai~in~ the temperature to 507F. ant then dropp~ng ~t bac~ down cau~ei th~ --S bi-metallic element 34 to ~nap to ~t~ dotted line po~i-tion as indicated in Flg. 1 at a temperature of 435F.
Fur~her decrea~e i~ th~ temperature to 199F. and then raislng it back up maintains the bi-metallic el~ment 34 ~n it~ ~otted llne Flg. 1' po8i~10n ~eallng approxlmately all of ~he fl~ b~tween the passage~ 28 and 30 un~
~ temperature reache~ 368Fo at whic~ t~me th~ bl-metallic element 34 ~naps ~o its sol~d line Fi~. 1 position al-lowing 100 per cent of the flow between pacsage~ 28 and 30. The raising of the temperature to 503F. and then dropping i~ back down causes the next switch to occur at 430F. It may thu~ be seen that with the fo~egoing con-struction, ~he bi-metallic elemene 34 provldes a posi tive clo~ure and opening of ~he passage 30 a~ reapeat-able tempera~ure~.
Certain modificatio~s and impro~ement~ will oceur to those skilled in the art upon r~ad~n~ the foxegoing description. It wi~l be understood that all such improvements and modiications have be~n deleted herein for ~he sake of conc~seness and readability bltt are properly within the scope of the following claims.
.
.. `.~ . . I
-- 1 ~ Case 4534 TEMPERATURE-ACTU~TED FL~W CO ~ ROL D~VI OE
. TE~HNIC~L FIELD . -i Thf~ invention relates to flow con~rol deviee3 in generai and i~ particular to a new and useful ga~ lo~
~ontrol device for ga~ analyzing apparatus u~ilizing a bi-metal ~w~tch to control ga3 flow in ~h2 apparatu~
BACKGROUND ART
The presen~ inYention has application ~o the con-trol of all fluids which requ~re a reduction of fluid flow or a shut-off fluld flow due to critical ~empera- ¦
ture changes in th~ fluid. l~e lnven~ion ha~ particular application in the oonstruction of g~8 analyzers w~ich use heated sampling ~ystems to prevent liquid condensa-15 tion in the system and w~ich syst~s draw a ga~ through . th~ syst~m by using an asplrator ~o affec~ the ~as flow.
It ~s desirabl~ in ~uch de~ice~ ~o int~rrup~ the sspira-tio~ of ga8 flow when the ~a~ sample tempera~ure falls below ~he d~w point oausing condensation within the apparatu~. Know~ device~ u~e a ~emperature sensor ~nd a solenoid valve to control the asplra~ng air stream by shu~ting it on and off. Such 2n ar~angement involves expcnsive electrlcal circuitry and connec~ion~ a~ well a~ piping which frequen~ly limits i~ applicab~lity due to ambienP effect~ on the valv~ and electr~c~l co~po~t8 .
, " S ~ Y OF THE INYENTI~
, In accordance wlth the present invent~on, the flow of an aspirating gas and, he~ce, the flow of a con~rol ga~ i8 regulated by use of a snap-acting bi-metallic . . switch which i8 mounted ln a chamber of an aspirator in-let pa~age to thereby control ~he fl~w of the aspirated 8as easily and automaticslly~ The bl-metallic switch i8 - ~
a disc or ~imilar element w~ich ha~ a~ area which over- ~i lies and closes ~he a~p~rator air pas~age whene~er the temperature of operatio~ i~ no in a satisfactory rang2.
The bi-metal element i8 chQsen to ach~eve the desired con~
trol in the predetermined temperature range and is lo-. cated i~ tha aspirated chamber where it is not appreciably 'I
sffected by the aspirating air. The bl-metal elemen~ pro-v~des excellent control wi~hin ~he deslred tempera~ure range of the s~mple. The bi-~e~al switch i8 made free- -float~ng in a chamber having a helght and diameter larger than the switch. The chamber ~urace hav~ng the control-led opening i~ ~apered to make ~he swltch self-aligning with the opening thus insuring positi~e clo~ure and re peatability. Thu8, a simple bi-metallic device will ac-complish ~he same functlon a~ an electrical con~rol valve but in a less espensive and easily-installed manner.
Accordingly, ~t 1~ an ob3ect of the present lnven~
tion to prvvide an improved ~emperature actuator fluid - cont~ol in w~ch a sampl~ ga~ flow i~ regulated by the flow of an asp~rating gas and this a~plra ing gaB 1~w i~ controlled by a bi-metalllc element whi~h clo~es off the fl~w whenever a desired ga~ ~emperature i~ ~ot ach~eved.
Yet ano~her obiect of the present lnvention ~8 to provide a ga~ sampllng d~vice w~ich include~ a free-floating bi-metallle switch mounted in a tapered area having a switch-controlled opening to make the switch self-center-ing with respect to the opening.
Still another object of the present invention is to provide a temperature actuated fluid flow control for a gas sampling device having a free-floating bi-metallic switch which has sym-metrical gas flow around the switch to insure repeatable switch action.
The invention consists of a temperature-actuated fluid flow control device comprising: a fluid inlet; an exhaust line for the fluid connected to said fluid inlet; means for inducing flow of fluid into said fluid inlet and out said exhaust line;
a switching chamber located between said fluid inlet and said exhaust line; a bi-metallic flexible element disposed in said switching chamber and being flexibly responsive to temperature change to move between a first flexed position wherein the element stops the flow of fluid between said fluid inlet and said exhaust line and a second flexed position opening flow between said fluid inlet and said exhaust line; and said switch-ing chamber being larger than said bi-metallic element to make said bi-metallic element free-floating in said switching chamber.
The foregoing and other objects of novelty which charac-teri2e the present invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure.
For a better understanding of the present invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which a preferred embodiment of the invention is illustrated.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a partial sectional view of a gas sampling device constructed in accordance with the present invention.
Fig. 2 is an expanded view of a bi-metallic element in the open flow position and the mounting area for same of the device of Fig. 1.
-3a-Fig. 3 is a top view of the bi-metallic switch and mount-ing area of Fig. 2.
Fig. 4 is a graphical representation of the operation of the device of Fig. 1 in response to temperature change.
DETAII,ED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawings wherein the showings are for purposes of detailing a preferred embodiment of the...
in~ention but not lim~ting the invention thereto, Figs.
1 through 3 show a tempexature actuat~d fluid flow con-trol device generally des~gnated 10 which in ~he embodl- ?
5 men~ illustra~ed comprises ~ device for sampling a ~a~.
The device 10 include~ an inle~ passage l~ for the inflow of a gas sample into a heated block or housing 14 ~h~ch contains a separate sampllng chamber 16 ha~ing a gas sen~lng device 18 w~ich may, for example, include ~eans 10 for determining the ~ype of gas and possibly the quantity . of such ga~ in a particular sample fl~. As shownJ the gas sensor 18 ~ connected through electrical linPs 20 to suitable instruments for determinin~ the desired ga~ .
sample charaeteris~ics. The sample gas then flows 15 through a reduced flow area section 20 followed by an aspirating cham~er 22 and then out through an exhaust or discharge area 24. The flow of the sample gas through the inlet 12 i8 controlled by the flow of an aspirating gas which is admlt~ed in the direction o~ an arrow 26 20 into an aspirating gas fl~w control ehamber 28 through an opening 30 into the chamber 22 and then ou~ the exhaust 24. This flow induces the flow of ~he ~ample gaR through the inle~ 12.
. The flow of the sample gas in the direction of 2S arrow 32 is con~rolled by the flow of ~he aspirated g~
in the direc i~n of.the arrow 26 through the opening 30.
A ~i-metallic el~ment-34 is disposed in th~ aspirating cham~er 28 and it may be flexed from th~ solid line indicated posltion to the do~ted line indicated p~sitlon 30 in aceordance ~ith predetermined temperature cha~e~ of th~ aspirating ga~. The bl-metallic element i~ made up of metsls having characterIstic~ whlch will permit it to operate in the desired temperature range and it i~
advantageou~ly in t~e form of a disc a~ may be best se~n 35 in Figs~ 2 and 3~ The cons~ruction may be of any sha~e such that ~c will close the openin~ 30 when th~ tempera-- ture i~ other than a correct operating te~perature.
In the embodiment o the inventlon shown as a gas 5 analyzer when the block 14 i8 at proper operating temper-ature the bi-metallic element 34 will remain in ~çhe. solid llne position and permi~ flow of aspirat~ng g~ and ~n- .
flow of ~he sample gas ln the directio~ of the arrow 32 by allowing air aro~d its periphery to e~cit il~tO tha 10 pas~age 30. If ~che bloclc temperature CooiR below the d~-sired ~cemperature, th~ bi-metallic elemenlt abruptly changes ts: the dot~ced lir~e position thereby blocking air flow to the pas~age 30 arld the aspira~cor to thereby shut - off t:he ~ampling proces~- . In ~o doing 9 it eliminstes 15 the poss~ility of condensate forming in the sample gas pas~ageways. The bi-metallic element 34 is fabricated by bonding two metal~ ~co~ether which ha~e differen~c thermal coe~ficlent~ of expan~ion. By proper s~lectlon of metals and diameters and ~izesD etc., ~che element i~
20 made to deflect abruptly in order to rapidly cause di~-placemen~ or exert forces.
As may be better seen wit~ partlcular reference to F'ig8. 2 through 4, the bi-metallic elemer~t 34 i~ made to be free-float~ing wlthin ~he~ ohamber ~. Free~
25 float:ing in the present e~bodiment is indlcated to have a clearance of approxlmately 0 . 010 lnche3 along the radius of che chamber 28 when the bl-metallic elemen~s 34 i8 of a diame~cer apprsximately 0 . 625 inehes in its Fig. 2 po~ltion. The hei)3ht c~earance i8 approxima~ely 0.008 30 inches on the chamber height H of 0.032 inche~. Thi~
a~ility of the bi~metallic elemen~ 34 to floa~ withln the chamber 28 preveR~ it rom being ~ammed.in unde~lred posi~ions as well a~ provide~ an adequate leakagç!! of air from the inlet 26 ~o ~he passa$e 30. To make ~che b~-35 metallic element 3b, ~elf-eent~rlng wi~h respect to the ~ 3~3 ~ S~
- . . . .
- . . . . .
passage 30, a tapered sect~on 40 18 formed a~ the ~: bottom of the chamber 28 which may be best described . -as a tapered section 40 hav~ng the passage 30 a~ it8 center and anglsd towards the pas~ag~ 30. The taper i8 approximately 0.004 inches sn~ this ~aper i8 sufficient to make the free-floating bi-metallic elem~nt 34 self- -centeri~g with respect to the pa~age 30.
: As ma~ be best een with p~rtlcular reference to Fig~. 2 and 3, the tapered ~e~tion 40 ~8 fonmed betwee~
- center~ of a pair of eounterbored sections 36 and 36t located along a diameter of ~he tapered section 40 and the center o~ passage 30. The counterbores 36 and 36 t are approx~mately 0.156 lnches ln diameter and are ap-proximately 0.125 inehes deep. The purpo~e of the~ecounterbores i~ to prov~de unrestricted flow resulting - ln a swift and large volume of air flowing from the in-let 28 to both sides of the bi-metallic element 34, thus making-it speedily respon~ve t~ temperature changes by maintaining a substantial volume of the same air on bot~ -sides of the bi-metallic element 34.
. The bl-metallic element 34 ~s manufactured to specification as is known by those skilled in ~he ar~
to ha~e a movement of approx~mately 0.02 inche~ between a snap te~peraturc a~ static flow o approximately 380F~
~nd a reset temperature of approx~mately 33l:1F~
As may be bes~ described wi~h partlcular reference to Fig. 4, which describes an actual snapping o~eratls:~n of the b~-metallio element w~th`time over a ~eries of 30 temperature cycle8 las~cing approxi~ately l . 5 hr~.Jcys~
From the curve, it may be seen ~hat flo~ from port ~8 to the pa~sage 30 remains at approximately O per cent over a time interval until the temperature in passage 28 re~che~ approxima~ely-377F., at which ~ime the bi-metallic element 34 8nap8 to its Fi~. 1 sol~d line , ~l~13B63 positibn sllowing lOO per cent of the flo~ fro~ thepa~sag~ 28 to the passage 30. Rai~in~ the temperature to 507F. ant then dropp~ng ~t bac~ down cau~ei th~ --S bi-metallic element 34 to ~nap to ~t~ dotted line po~i-tion as indicated in Flg. 1 at a temperature of 435F.
Fur~her decrea~e i~ th~ temperature to 199F. and then raislng it back up maintains the bi-metallic el~ment 34 ~n it~ ~otted llne Flg. 1' po8i~10n ~eallng approxlmately all of ~he fl~ b~tween the passage~ 28 and 30 un~
~ temperature reache~ 368Fo at whic~ t~me th~ bl-metallic element 34 ~naps ~o its sol~d line Fi~. 1 position al-lowing 100 per cent of the flow between pacsage~ 28 and 30. The raising of the temperature to 503F. and then dropping i~ back down causes the next switch to occur at 430F. It may thu~ be seen that with the fo~egoing con-struction, ~he bi-metallic elemene 34 provldes a posi tive clo~ure and opening of ~he passage 30 a~ reapeat-able tempera~ure~.
Certain modificatio~s and impro~ement~ will oceur to those skilled in the art upon r~ad~n~ the foxegoing description. It wi~l be understood that all such improvements and modiications have be~n deleted herein for ~he sake of conc~seness and readability bltt are properly within the scope of the following claims.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A temperature-actuated fluid flow control device comprising:
a fluid inlet;
an exhaust line for the fluid connected to said fluid inlet;
means for inducing flow of fluid into said fluid inlet and out said exhaust line;
a switching chamber located between said fluid inlet and said exhaust line;
a bi-metallic flexible element disposed in said switching chamber and being flexibly responsive to temperature change to move between a first flexed posi-tion wherein the element stops the flow of fluid between said fluid inlet and said exhaust line and a second flexed position opening flow between said fluid inlet and said exhaust line; and said switching chamber being larger than said bi-metallic element to make said bi-metallic element free-floating in said switching chamber.
a fluid inlet;
an exhaust line for the fluid connected to said fluid inlet;
means for inducing flow of fluid into said fluid inlet and out said exhaust line;
a switching chamber located between said fluid inlet and said exhaust line;
a bi-metallic flexible element disposed in said switching chamber and being flexibly responsive to temperature change to move between a first flexed posi-tion wherein the element stops the flow of fluid between said fluid inlet and said exhaust line and a second flexed position opening flow between said fluid inlet and said exhaust line; and said switching chamber being larger than said bi-metallic element to make said bi-metallic element free-floating in said switching chamber.
2. A temperature-actuated fluid flow control device as set forth in claim 1 wherein said bi-metallic element has a predetermined height and where the height of said switching chamber is greater than the height of said bi-metallic element.
3. A temperature-actuated fluid flow control device as set forth in claim 2 wherein said bi-metallic element is circular and wherein said switching chamber is also circular but having a radius larger than the radius of said bi-metallic element.
4. A temperature-actuated fluid flow control device as set forth in claim 3 wherein said switching chamber has a pair of counterbored areas formed at the extreme ends of a diameter of said switching chamber to allow the symmetrical flow of fluid past said bi-metallic element.
5. A temperature-actuated fluid flow control device as set forth in claim 4 wherein said switching chamber has a centrally-located outlet port communicat-ing with said fluid outlet and a tapered area inclined toward said outlet port to make said bi-metallic element self-centering with said outlet port.
6. A gas sampling device comprising:
means defining a gas sampling chamber having a gas sensor in said chamber;
a sample gas inlet connected into said gas sampling chamber;
means for moving sample gas between said gas sampling chamber and said exhaust line including a switching chamber located therebetween, a bi-metallic element disposed in said switching chamber and being flexible and responsive to temperature change so that in a first flexed position it stops the flow between said gas sampling chamber and said exhaust line while allowing flow therebetween in a second flexed position;
and wherein said switching chamber is larger than said bi-metallic element to make said element free-floating therein.
means defining a gas sampling chamber having a gas sensor in said chamber;
a sample gas inlet connected into said gas sampling chamber;
means for moving sample gas between said gas sampling chamber and said exhaust line including a switching chamber located therebetween, a bi-metallic element disposed in said switching chamber and being flexible and responsive to temperature change so that in a first flexed position it stops the flow between said gas sampling chamber and said exhaust line while allowing flow therebetween in a second flexed position;
and wherein said switching chamber is larger than said bi-metallic element to make said element free-floating therein.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US467,554 | 1983-02-17 | ||
| US06/467,554 US4557419A (en) | 1983-02-17 | 1983-02-17 | Temperature-actuated flow control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1213863A true CA1213863A (en) | 1986-11-12 |
Family
ID=23856175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000446768A Expired CA1213863A (en) | 1983-02-17 | 1984-02-03 | Temperature-actuated flow control device |
Country Status (12)
| Country | Link |
|---|---|
| US (2) | US4557419A (en) |
| EP (1) | EP0117062B1 (en) |
| JP (1) | JPS59157525A (en) |
| KR (1) | KR890002321B1 (en) |
| AU (2) | AU566706B2 (en) |
| BR (1) | BR8400406A (en) |
| CA (1) | CA1213863A (en) |
| DE (1) | DE3471184D1 (en) |
| ES (1) | ES277507Y (en) |
| HK (1) | HK98588A (en) |
| IN (1) | IN162945B (en) |
| MX (1) | MX158860A (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4557419A (en) * | 1983-02-17 | 1985-12-10 | The Babcock & Wilcox Company | Temperature-actuated flow control device |
| US4608556A (en) * | 1983-07-04 | 1986-08-26 | Cole Martin T | Smoke detection apparatus |
| US4616052A (en) * | 1985-07-05 | 1986-10-07 | Becton, Dickinson And Company | High temperature creep resistant thermoplastic elastomer compositions |
| DE3717676C2 (en) * | 1987-05-26 | 1997-05-07 | Bayerische Motoren Werke Ag | Vehicle heating or air conditioning |
| US4799394A (en) * | 1987-09-03 | 1989-01-24 | The Babcock & Wilcox Company | Analyzer block for sealing and isolating analyzer gas sample flow |
| US4852637A (en) * | 1988-06-02 | 1989-08-01 | United Technologies Corporation | Thermostatic controlled system |
| NL9002168A (en) * | 1990-10-05 | 1992-05-06 | Blandikus Catharikus Jaspers E | HOLLOW ELECTRODE FOR AN ELECTROCHEMICAL CELL PROVIDED WITH AT LEAST A GAS SUPPLY AND EXHAUST OPENING, AND ELECTROCHEMICAL CELL INCLUDING SUCH ELECTRODE. |
| DE4040910C2 (en) * | 1990-12-20 | 1993-11-11 | Emerson Electric Gmbh | Sensor element for a temperature-dependent switching, regulating or control device |
| US6431458B1 (en) | 2001-04-10 | 2002-08-13 | Pgi International, Ltd. | Temperature actuated flow restrictor |
| US6450412B1 (en) | 2001-04-10 | 2002-09-17 | Pgi International, Ltd. | Temperature actuated flow restrictor |
| US7111521B1 (en) | 2005-05-19 | 2006-09-26 | The United States Of America As Represented By The Secretary Of The Navy | Sampling system for moving fluid |
| NZ572060A (en) * | 2006-04-20 | 2011-11-25 | Scantech Int Pty Ltd | Particle monitor with means for purging analysis chamber with heated gas |
| CN104122123B (en) * | 2014-08-15 | 2016-05-18 | 武汉市天虹仪表有限责任公司 | A kind of gaseous mercury sampling apparatus for stationary source |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3709204A (en) * | 1971-04-09 | 1973-01-09 | Gen Motors Corp | Crankcase ventilation |
| IT1024413B (en) * | 1973-12-26 | 1978-06-20 | Texas Instruments Inc | IMPROVEMENT IN VALVE COMPLEXES FOR FLUIDS INCLUDING A BIMETALLIC THERMOSTATIC ELEMENT |
| US3930613A (en) * | 1974-10-18 | 1976-01-06 | Therm-O-Disc Incorporated | Check valve having temperature response |
| US3960500A (en) * | 1975-01-09 | 1976-06-01 | Bailey Meter Company | Gas sampling analyzing system |
| US3970106A (en) * | 1975-03-03 | 1976-07-20 | Reed Tool Company | Collapsible ball valve |
| FR2389123A1 (en) * | 1977-04-27 | 1978-11-24 | Charbonnages De France | Hot, humid gas samples prodn. - involves dosing with inert gas and raising above dew point before entering analysis appts. |
| US4141379A (en) * | 1977-05-16 | 1979-02-27 | Cutter Laboratories, Inc. | Check valve |
| US4441356A (en) * | 1982-03-29 | 1984-04-10 | The Babcock & Wilcox Company | Temperature actuated air flow control and gas sampler |
| US4557419A (en) * | 1983-02-17 | 1985-12-10 | The Babcock & Wilcox Company | Temperature-actuated flow control device |
-
1983
- 1983-02-17 US US06/467,554 patent/US4557419A/en not_active Expired - Lifetime
-
1984
- 1984-01-03 AU AU23046/84A patent/AU566706B2/en not_active Ceased
- 1984-01-18 EP EP84300307A patent/EP0117062B1/en not_active Expired
- 1984-01-18 DE DE8484300307T patent/DE3471184D1/en not_active Expired
- 1984-01-31 BR BR8400406A patent/BR8400406A/en not_active IP Right Cessation
- 1984-02-03 CA CA000446768A patent/CA1213863A/en not_active Expired
- 1984-02-09 KR KR1019840000600A patent/KR890002321B1/en not_active IP Right Cessation
- 1984-02-14 ES ES1984277507U patent/ES277507Y/en not_active Expired
- 1984-02-15 IN IN104/CAL/84A patent/IN162945B/en unknown
- 1984-02-15 MX MX200337A patent/MX158860A/en unknown
- 1984-02-16 JP JP59026188A patent/JPS59157525A/en active Granted
- 1984-03-23 US US06/592,503 patent/US4502341A/en not_active Expired - Lifetime
-
1987
- 1987-09-02 AU AU77784/87A patent/AU618516B2/en not_active Ceased
-
1988
- 1988-12-08 HK HK985/88A patent/HK98588A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59157525A (en) | 1984-09-06 |
| MX158860A (en) | 1989-03-20 |
| EP0117062B1 (en) | 1988-05-11 |
| KR890002321B1 (en) | 1989-06-30 |
| IN162945B (en) | 1988-07-23 |
| EP0117062A1 (en) | 1984-08-29 |
| ES277507Y (en) | 1985-02-16 |
| AU566706B2 (en) | 1987-10-29 |
| ES277507U (en) | 1984-07-01 |
| AU2304684A (en) | 1984-08-23 |
| AU618516B2 (en) | 1992-01-02 |
| BR8400406A (en) | 1985-02-12 |
| US4557419A (en) | 1985-12-10 |
| KR840009152A (en) | 1984-12-24 |
| HK98588A (en) | 1988-12-16 |
| JPH023457B2 (en) | 1990-01-23 |
| AU7778487A (en) | 1987-12-03 |
| US4502341A (en) | 1985-03-05 |
| DE3471184D1 (en) | 1988-06-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1213863A (en) | Temperature-actuated flow control device | |
| CA1186915A (en) | Temperature actuated air flow control and gas sampler | |
| US3992941A (en) | Liquid level measuring apparatus | |
| EP0071877B1 (en) | Magnetic differential pressure valve with an indicator showing when valve has opened or closed | |
| CA1097990A (en) | Magnetic pressure indicator with thermal lockout | |
| US4729339A (en) | Pressure differential indicator with non-mechanical thermal lockout | |
| US4383231A (en) | Temperature switch having a magnetically soft amorphous metal member | |
| GB2076539A (en) | Fluid pressure sensing apparatus | |
| KR910015858A (en) | Automatic capping device for analyzer pipette | |
| US4320871A (en) | Bimetallic column | |
| CA1119837A (en) | Magnetic pressure indicator with deactuator for bimetallic temperature-sensitive elements | |
| BR7906766A (en) | TEMPERATURE-SENSITIVE CONTROL DEVICE | |
| CA2180165C (en) | Precision double-pole single-throw switch assembly | |
| DE19634690A1 (en) | Micro heat conductivity detector for gas analysis | |
| SU1162447A1 (en) | Laboratory rectifying column | |
| Khononzon et al. | Microsensors and actuators based on single-crystal silicon in miniature gas chromatographs and analysers | |
| SU685946A1 (en) | Liquid sampling device | |
| SU1690009A1 (en) | Thermal relay | |
| EP0210947A3 (en) | Device for detecting the presence of a gas | |
| SU797705A1 (en) | Sprinkler | |
| SU1767442A1 (en) | Air flow relay | |
| RU2082117C1 (en) | Dilatometric thermal relay | |
| US3399604A (en) | Water pressure activated switch | |
| SE8405859D0 (en) | DEVICE FOR COLLECTION OF LIQUID SAMPLES IN A LIQUID PASSAGE | |
| SU1195122A1 (en) | Steam trap |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |