US20030138335A1 - Tube pump - Google Patents
Tube pump Download PDFInfo
- Publication number
- US20030138335A1 US20030138335A1 US10/326,473 US32647302A US2003138335A1 US 20030138335 A1 US20030138335 A1 US 20030138335A1 US 32647302 A US32647302 A US 32647302A US 2003138335 A1 US2003138335 A1 US 2003138335A1
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- United States
- Prior art keywords
- tube
- pump
- pressure application
- accordance
- housing
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/0009—Special features
- F04B43/0054—Special features particularities of the flexible members
- F04B43/0072—Special features particularities of the flexible members of tubular flexible members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
- F04B43/123—Machines, pumps, or pumping installations having flexible working members having peristaltic action using an excenter as the squeezing element
Definitions
- the present invention relates to a tube pump, more particularly to an improvement of a tube for use in the tube pump.
- a tube pump is configured such that a tube is disposed in a ring shape along a circular inner circumferential face formed in a housing and such that the tube is squeezed sequentially in the longitudinal direction thereof by a pressure application member disposed inward, such as a roller or a ring, so as to feed fluid from the inside of the tube.
- a straight tube which is made of a rubber elastic material, circular or nearly circular in cross section and stretchable and compressible in both the radial and longitudinal directions, is generally used as a tube for this pump. This tube is bent in a ring shape and disposed along the inner circumferential face of the housing.
- the tube in order to operate the pump efficiently, the tube is required to be flattened completely so as not to cause any clearance inside when the tube is squeezed, and also required to return to its original shape promptly after squeezing.
- a pressure force that is large enough to fold back the wall of the tube 180 degrees at both ends thereof in cross section.
- the elastic force of the tube is larger.
- the pressure force is large enough to cope with this large elastic force. Therefore, these also become great factors making the size of the pump larger.
- these require extra energy significantly exceeding energy required for fluid transfer. As a result, the efficiency of the pump is lowered, and the tube is apt to break at portions wherein folding back is repeated, thereby increasing maintenance cost.
- a first object of the present invention is to provide a compact tube pump.
- a second object of the present invention is to reduce energy required for pump operation.
- a third object of the present invention is to provide a tube pump comprising a tube being resistant to breakage.
- a fourth object of the present invention is to provide a tube pump having very few limitations on the material of the tube so as to be usable for wide applications.
- the tube pump of the present invention uses a tube formed by blow molding beforehand into a shape adapted for the inner circumferential face of the housing.
- FIG. 1 is a schematic front view showing an embodiment of a tube pump in accordance of the present invention
- FIG. 2A is a perspective view showing a tube for use in the pump
- FIG. 2B is a sectional view showing a shape of the squeezed portion of the tube
- FIG. 3A is a sectional view showing another shape of the squeezed portion of the tube
- FIG. 3B is a sectional view showing still another shape of the squeezed portion of the tube
- FIG. 4 is a sectional view showing shapes of the pressure application faces of the pump and a further shape of the squeezed portion of the tube;
- FIG. 5A is a sectional view showing a still further shape of the squeezed portion of the tube for use in the pump.
- FIG. 5B is a sectional view showing a squeezed condition of the still further shape of the squeezed portion of the tube.
- numeral 1 designates a housing having an inner circumferential face 2 .
- a circular pressure application face 2 a is formed in a range larger than the half and smaller than the whole of the circumference of the inner circumferential face 2 .
- An opening portion 2 b is provided at a portion wherein the pressure application face 2 a is not formed.
- Numeral 3 designates a tube. The tube 3 is disposed along the inner circumferential face 2 . The straight extension portions 3 a at both ends of the tube 3 are extended outside the housing 1 from the opening portion 2 b.
- Numeral 4 designates a ring-shaped pressure application member disposed on the inner side of the tube 3 .
- the pressure application member 4 has a double structure comprising an inner ring 41 and an outer ring 42 .
- the inner ring 41 is made of a rigid material having a low friction coefficient, such as a fluorocarbon-resin-based synthetic resin mold.
- the outer ring 42 is formed of a mold made of an elastic material having a high friction coefficient, such as rubber. The outer circumference of the outer ring 42 is used as a pressure application face 4 b.
- Numeral 5 designates an eccentric driving member disposed on the inner side of the pressure application member 4 .
- Numeral 6 designates a rotation shaft on which the eccentric driving member 5 is installed.
- the eccentric driving member 5 rotates for example clockwise as seen in FIG. 1 while its circular outer circumferential face 5 a makes sliding contact with the inner circumferential face 4 a of the pressure application member 4 .
- the pressure application member 4 carries-out circular motion along the inner circumferential face 2 of the housing 1 , whereby the pressure application faces 2 a and 4 b hold the tube 3 therebetween and squeeze the tube 3 sequentially toward the left extension portion 3 a as seen in FIG. 1.
- a drive motor (not shown) is disposed on the rear face of the housing 1 , and the output shaft of the motor is directly used as the rotation shaft 6 or connected to the rotation shaft 6 via an appropriate reduction gear.
- the tube 3 is formed by blow molding from a synthetic resin having a high chemical resistance, such as polypropylene, polyethylene and fluorocarbon resin. As a whole, the tube 3 has a shape shown in FIG. 2A.
- the straight extension portion 3 a adapted for the opening 2 b is formed at each end of the ring-shaped squeezed portion 3 c adapted for the pressure application face 2 a of the housing 1 so as to be integrated with the squeezed portion 3 c .
- a connection portion 3 b for connection to another apparatus via a tube is formed at the end of the extension portions 3 a .
- the connection portion 3 b is provided with appropriate annular projections to prevent disconnection.
- This tube 3 is not so flexible as rubber because it is a mold made of the above-mentioned material. Furthermore, the tube 3 has some hardness and rigidity, and also has elasticity so as to be deformable and so as to return to its original shape after deformation.
- the shape of the tube 3 shown in FIG. 2A is just an example, and it is needless to say that the tube 3 can be formed into a shape adapted for the inner circumferential face 2 of the housing 1 in which the tube 3 is used.
- blow molding It should be apparent to one of ordinary skill in the art that there are several ways of blow molding. Such ways include injection and extrusion blow molding.
- FIG. 2B is a sectional view taken along a plane in a direction perpendicular to the length of the squeezed portion 3 c .
- its cross section has a flat shape wherein an outer side 3 d making contact with the housing 1 is joined to an inner side 3 e making contact with the pressure application member 4 at joint portions 3 f .
- An angle A at which the outer side 3 d intersects the inner side 3 e is an acute angle.
- Both the outer side 3 d and the inner side 3 e have circular arc shapes slightly inflated outward.
- the thickness of the outer side 3 d and the thickness of the inner side 3 e are far smaller than that of the extension portion 3 a .
- the cross sections of the outer side 3 d and the inner side 3 e have ordinary circular arc shapes.
- the cross sections may have circular arc shapes partially taken from ellipses.
- the tube pump 11 of this embodiment comprises the tube 3 having the above-mentioned shape
- the outer side 3 d and the inner side 3 e having small wall thicknesses and slightly inflated shapes should only be flattened at the time of squeezing. Since the angle at the joint portion 3 f is an acute angle, the amount of its deformation is small at the time of squeezing. Furthermore, in the case of this deformation, both the ends are not folded back 180 degrees when flattened.
- the outer side 3 d and the inner side 3 e should only have elasticity to the extent that they can return to their inflated shapes. For this reason, the wall thicknesses of the outer side 3 d and the inner side 3 e can be made smaller.
- the tube can be squeezed completely by applying a smaller pressure force in comparison with a case wherein a circular rubber tube is squeezed, and breakage at the joint portions 3 f owing to repeated deformations is less likely to occur. Still further, since the deformations at the outer side 3 d and the inner side 3 e are small, they can return promptly to their original shapes after squeezing by virtue of the recovery forces of the outer side 3 d , the inner side 3 e and the joint portions 3 f.
- FIGS. 3A and 3B show examples of other sectional shapes of the squeezed portion 3 c .
- the shapes of the outer side 3 d and the inner side 3 e shown in FIG. 3A are formed of broken lines wherein the outer side 3 d and the inner side 3 e are inflated and bent outward thereby forming a rhombus. In addition to this rhombus, it is possible to have a flat hexagon or the like.
- the shape shown in FIG. 3B is similar to that shown in FIG. 2B, but the joint portions 3 f have fin shapes extending in the direction of flatness of the tube 3 .
- the outer side 3 d and the inner side 3 e have shapes smoothly inflated in parallel with the fin-shaped joint portions 3 f .
- deformations at the joint portions 3 f are almost negligible, whereby the tube 3 can be squeezed easily to a flat shape.
- the sum of the wall thickness of the outer side 3 d and the wall thickness of the inner side 3 e is made equal to the wall thickness of the joint portion 3 f , and when the tube 3 is squeezed and flattened, the thickness of the tube 3 becomes constant on the whole.
- the tube 3 is formed into the shape adapted for the inner circumferential face 2 of the housing 1 beforehand as described above, even when the housing 1 is small and when the curvature of the inner circumferential face 2 is large, no extension force applies to the outer side of the curved shape of the tube 3 , and no compression force applies to the inner side of the curved shape of the tube 3 during pump operation.
- the sectional shape of the squeezed portion 3 c of the tube 3 that is squeezed during pump operation is a flat shape wherein the outer side 3 d on the side of the housing 1 and the inner side 3 e on the side of the pressure application member 4 are joined to each other at acute angles.
- the wall thickness of the squeezed portion 3 c can be decreased, and the amount of its deformation at the time of squeezing can be reduced, whereby squeezing can be carried out securely by applying a relatively small pressure force.
- the size of the pump is prevented from being made larger, and breakage of the tube owing to repeated deformations does not occur because the amount of deformation of the tube is reduced.
- a variety of synthetic resins can be used as materials of the tube, whereby it is possible to obtain a tube pump applicable to a variety of medicines and chemical products.
- this kind of pump is not used independently, but is required to be connected between external apparatuses via connection tubes in order to receive and deliver fluid to be transferred.
- the connection to the external apparatuses is easy, since the connection portion 3 b is formed at each end of the tube 3 so as to be integrated therewith as described above.
- the pressure application face 2 a of the housing 1 and the pressure application face 4 b of the pressure application member 4 are cylindrical and that their sectional shapes are straight in the axial direction.
- the squeezed portion 3 c of the tube 3 is symmetrical with respect to its centerline in the direction of flatness of the tube 3 .
- one of the pressure application face 2 a of the housing 1 and the pressure application face 4 b of the pressure application member 4 can have a convex circular arc shape in cross section, and the other can have a concave circular arc shape in cross section adapted for the convex circular shape.
- the wall thickness of one of the outer side 3 d and the inner side 3 e of the tube 3 , making contact with the concave pressure application face is made larger, and that the wall thickness of the other, making contact with the convex pressure application face, is made smaller.
- the pressure application face 4 b is made convex
- the pressure application face 2 a is made concave
- the wall thickness of the outer side 3 d of the tube 3 is made larger
- the wall thickness of the inner side 3 e is made smaller.
- the side that is thin and deformable easily at the time of squeezing that is, the inner side 3 e in the example shown in FIG. 4
- the inner side 3 e can be deformed and pressed easily against the outer side 3 d with no clearance therebetween as indicated in a chain line.
- no large pressure force is required for squeezing.
- the inner side 3 e returns to its original shape by virtue of its elasticity.
- a thin object having a slightly inflated shape has the property of being deflated abruptly because of a kind of buckling phenomenon when an external pressure larger than the deflation pressure of the object is applied to the object and returning to its original shape abruptly when the external pressure becomes extinct.
- this tube 3 by properly selecting the wall thickness and the inflated shape of the inner side 3 e , the inner side 3 e can be deflated easily by slight pressure application and can immediately return to its original shape when the pressure application ceases.
- FIGS. 5A and 5B show an example wherein the shape returning force of the tube 3 is improved by using a structure different from the above-mentioned structures.
- a structure different from the above-mentioned structures at least the squeezed portion 3 c of the tube 3 , a synthetic resin mold, is covered with a rubber tube 8 .
- this rubber tube 8 has a size that achieves a slightly stretched condition when the tube 3 is covered with the rubber tube 8 .
- an inward contracting stress is produced in the stretched rubber tube 8 as indicated by the arrows.
- the returning force of the rubber tube 8 is superimposed on the returning force of the tube 3 itself, whereby the tube 3 can promptly return to its original shape after squeezing.
- a structure in which cushion members made of sponge or the like are disposed at positions making contact with the connection portions 3 f at both ends of the tube 3 when squeezed and flattened, may be used.
- the forces for returning the connection portions 3 f are generated by the cushion members. Even when this configuration is used, the tube 3 can return promptly to its original shape after squeezing.
- the tube can return promptly to its original shape after the squeezing of the tube is completed, whereby it is possible to obtain an efficient tube pump.
Abstract
A tube pump comprising a tube formed beforehand into a shape adapted for the inner circumferential face of the housing. With this configuration, the tube can be used without problems even when the inner circumferential face of the housing is small and when the curvature of the inner circumferential face is large, and squeezing can be carried out by applying a small pressure force to the tube. Hence, the size of the pump is prevented from being made larger, and breakage of the tube owing to repeated deformations does not occur because the amount of deformation of the tube is reduced. Furthermore, synthetic resins having high chemical resistance can be used as materials of the tube. Hence, unlike a rubber tube, the tube of the present invention is suited for a wide range of applications.
Description
- 1. Field of the Invention
- The present invention relates to a tube pump, more particularly to an improvement of a tube for use in the tube pump.
- 2. Description of the Prior Art
- A tube pump is configured such that a tube is disposed in a ring shape along a circular inner circumferential face formed in a housing and such that the tube is squeezed sequentially in the longitudinal direction thereof by a pressure application member disposed inward, such as a roller or a ring, so as to feed fluid from the inside of the tube. A straight tube, which is made of a rubber elastic material, circular or nearly circular in cross section and stretchable and compressible in both the radial and longitudinal directions, is generally used as a tube for this pump. This tube is bent in a ring shape and disposed along the inner circumferential face of the housing.
- When the straight tube is bent during use as described above, the outer side of the bent tube is stretched, and the inner side thereof is compressed. Hence, if the curvature of the bent tube exceeds a certain limit, the tube results in buckling, and the buckling portion becomes flat, whereby the effective cross-sectional area of the tube becomes small and the pump cannot deliver its intended capacity. To prevent this problem, it is necessary to take countermeasures. For example, the diameter of the inner circumferential face of the housing is made larger to decrease the curvature thereof, or the wall thickness of the tube is made larger to make the tube resistant to flattening. However, these countermeasures become great factors making the size of the pump larger.
- In addition, in order to operate the pump efficiently, the tube is required to be flattened completely so as not to cause any clearance inside when the tube is squeezed, and also required to return to its original shape promptly after squeezing. However, in the case of a tube being circular in cross section, in order to completely flatten this tube, it is necessary to apply a pressure force that is large enough to fold back the wall of the tube 180 degrees at both ends thereof in cross section. Furthermore, in order to allow the tube to return to its original shape promptly after squeezing, it is preferable that the elastic force of the tube is larger. Hence, it is necessary that the pressure force is large enough to cope with this large elastic force. Therefore, these also become great factors making the size of the pump larger. Moreover, these require extra energy significantly exceeding energy required for fluid transfer. As a result, the efficiency of the pump is lowered, and the tube is apt to break at portions wherein folding back is repeated, thereby increasing maintenance cost.
- Still further, since a freely stretchable and compressible tube having rubber-like elasticity is required, the material of the tube that can be used for the pump is limited. Hence, it is impossible to use tubes made of synthetic resins having high chemical resistance, such as polypropylene, polyethylene and fluorocarbon resin, thereby causing a problem of limiting the application range of the pump.
- In view of these problems, a first object of the present invention is to provide a compact tube pump. A second object of the present invention is to reduce energy required for pump operation. A third object of the present invention is to provide a tube pump comprising a tube being resistant to breakage. Furthermore, a fourth object of the present invention is to provide a tube pump having very few limitations on the material of the tube so as to be usable for wide applications.
- In order to attain the above-mentioned objects, the tube pump of the present invention uses a tube formed by blow molding beforehand into a shape adapted for the inner circumferential face of the housing.
- The specific configuration of the tube pump of the present invention, more particularly the specific configuration of its tube, will become apparent from the following descriptions of embodiments of the invention.
- FIG. 1 is a schematic front view showing an embodiment of a tube pump in accordance of the present invention;
- FIG. 2A is a perspective view showing a tube for use in the pump;
- FIG. 2B is a sectional view showing a shape of the squeezed portion of the tube;
- FIG. 3A is a sectional view showing another shape of the squeezed portion of the tube;
- FIG. 3B is a sectional view showing still another shape of the squeezed portion of the tube;
- FIG. 4 is a sectional view showing shapes of the pressure application faces of the pump and a further shape of the squeezed portion of the tube;
- FIG. 5A is a sectional view showing a still further shape of the squeezed portion of the tube for use in the pump; and
- FIG. 5B is a sectional view showing a squeezed condition of the still further shape of the squeezed portion of the tube.
- Referring to FIG. 1,
numeral 1 designates a housing having an innercircumferential face 2. On the innercircumferential face 2, a circularpressure application face 2 a is formed in a range larger than the half and smaller than the whole of the circumference of the innercircumferential face 2. Anopening portion 2 b is provided at a portion wherein thepressure application face 2 a is not formed.Numeral 3 designates a tube. Thetube 3 is disposed along the innercircumferential face 2. Thestraight extension portions 3 a at both ends of thetube 3 are extended outside thehousing 1 from theopening portion 2 b. - Numeral4 designates a ring-shaped pressure application member disposed on the inner side of the
tube 3. The pressure application member 4 has a double structure comprising aninner ring 41 and anouter ring 42. Theinner ring 41 is made of a rigid material having a low friction coefficient, such as a fluorocarbon-resin-based synthetic resin mold. Theouter ring 42 is formed of a mold made of an elastic material having a high friction coefficient, such as rubber. The outer circumference of theouter ring 42 is used as apressure application face 4 b. - Numeral5 designates an eccentric driving member disposed on the inner side of the pressure application member 4. Numeral 6 designates a rotation shaft on which the
eccentric driving member 5 is installed. Theeccentric driving member 5 rotates for example clockwise as seen in FIG. 1 while its circular outercircumferential face 5 a makes sliding contact with the innercircumferential face 4 a of the pressure application member 4. Hence, the pressure application member 4 carries-out circular motion along the innercircumferential face 2 of thehousing 1, whereby the pressure application faces 2 a and 4 b hold thetube 3 therebetween and squeeze thetube 3 sequentially toward theleft extension portion 3 a as seen in FIG. 1. A drive motor (not shown) is disposed on the rear face of thehousing 1, and the output shaft of the motor is directly used as therotation shaft 6 or connected to therotation shaft 6 via an appropriate reduction gear. - The
tube 3 is formed by blow molding from a synthetic resin having a high chemical resistance, such as polypropylene, polyethylene and fluorocarbon resin. As a whole, thetube 3 has a shape shown in FIG. 2A. Thestraight extension portion 3 a adapted for theopening 2 b is formed at each end of the ring-shaped squeezedportion 3 c adapted for thepressure application face 2 a of thehousing 1 so as to be integrated with the squeezedportion 3 c. In addition, aconnection portion 3 b for connection to another apparatus via a tube is formed at the end of theextension portions 3 a. Theconnection portion 3 b is provided with appropriate annular projections to prevent disconnection. Thistube 3 is not so flexible as rubber because it is a mold made of the above-mentioned material. Furthermore, thetube 3 has some hardness and rigidity, and also has elasticity so as to be deformable and so as to return to its original shape after deformation. The shape of thetube 3 shown in FIG. 2A is just an example, and it is needless to say that thetube 3 can be formed into a shape adapted for the innercircumferential face 2 of thehousing 1 in which thetube 3 is used. - It should be apparent to one of ordinary skill in the art that there are several ways of blow molding. Such ways include injection and extrusion blow molding.
- FIG. 2B is a sectional view taken along a plane in a direction perpendicular to the length of the squeezed
portion 3 c. In other words, its cross section has a flat shape wherein anouter side 3 d making contact with thehousing 1 is joined to aninner side 3 e making contact with the pressure application member 4 atjoint portions 3 f. An angle A at which theouter side 3 d intersects theinner side 3 e is an acute angle. Both theouter side 3 d and theinner side 3 e have circular arc shapes slightly inflated outward. Since the squeezedportion 3 c is extended in the direction of flatness of thetube 3, the thickness of theouter side 3 d and the thickness of theinner side 3 e are far smaller than that of theextension portion 3 a. In FIG. 2B, it is assumed that the cross sections of theouter side 3 d and theinner side 3 e have ordinary circular arc shapes. However, the cross sections may have circular arc shapes partially taken from ellipses. - Since the
tube pump 11 of this embodiment comprises thetube 3 having the above-mentioned shape, theouter side 3 d and theinner side 3 e having small wall thicknesses and slightly inflated shapes should only be flattened at the time of squeezing. Since the angle at thejoint portion 3 f is an acute angle, the amount of its deformation is small at the time of squeezing. Furthermore, in the case of this deformation, both the ends are not folded back 180 degrees when flattened. Hence, theouter side 3 d and theinner side 3 e should only have elasticity to the extent that they can return to their inflated shapes. For this reason, the wall thicknesses of theouter side 3 d and theinner side 3 e can be made smaller. Therefore, the tube can be squeezed completely by applying a smaller pressure force in comparison with a case wherein a circular rubber tube is squeezed, and breakage at thejoint portions 3 f owing to repeated deformations is less likely to occur. Still further, since the deformations at theouter side 3 d and theinner side 3 e are small, they can return promptly to their original shapes after squeezing by virtue of the recovery forces of theouter side 3 d, theinner side 3 e and thejoint portions 3 f. - FIGS. 3A and 3B show examples of other sectional shapes of the squeezed
portion 3 c. The shapes of theouter side 3 d and theinner side 3 e shown in FIG. 3A are formed of broken lines wherein theouter side 3 d and theinner side 3 e are inflated and bent outward thereby forming a rhombus. In addition to this rhombus, it is possible to have a flat hexagon or the like. Furthermore, the shape shown in FIG. 3B is similar to that shown in FIG. 2B, but thejoint portions 3 f have fin shapes extending in the direction of flatness of thetube 3. Theouter side 3 d and theinner side 3 e have shapes smoothly inflated in parallel with the fin-shapedjoint portions 3 f. Hence, deformations at thejoint portions 3 f are almost negligible, whereby thetube 3 can be squeezed easily to a flat shape. In this case, when the sum of the wall thickness of theouter side 3 d and the wall thickness of theinner side 3 e is made equal to the wall thickness of thejoint portion 3 f, and when thetube 3 is squeezed and flattened, the thickness of thetube 3 becomes constant on the whole. - Since the
tube 3 is formed into the shape adapted for the innercircumferential face 2 of thehousing 1 beforehand as described above, even when thehousing 1 is small and when the curvature of the innercircumferential face 2 is large, no extension force applies to the outer side of the curved shape of thetube 3, and no compression force applies to the inner side of the curved shape of thetube 3 during pump operation. Furthermore, the sectional shape of the squeezedportion 3 c of thetube 3 that is squeezed during pump operation is a flat shape wherein theouter side 3 d on the side of thehousing 1 and theinner side 3 e on the side of the pressure application member 4 are joined to each other at acute angles. Hence, the wall thickness of the squeezedportion 3 c can be decreased, and the amount of its deformation at the time of squeezing can be reduced, whereby squeezing can be carried out securely by applying a relatively small pressure force. - With these overall effects, the size of the pump is prevented from being made larger, and breakage of the tube owing to repeated deformations does not occur because the amount of deformation of the tube is reduced. Furthermore, a variety of synthetic resins can be used as materials of the tube, whereby it is possible to obtain a tube pump applicable to a variety of medicines and chemical products.
- Still further, this kind of pump is not used independently, but is required to be connected between external apparatuses via connection tubes in order to receive and deliver fluid to be transferred. In this embodiment, the connection to the external apparatuses is easy, since the
connection portion 3 b is formed at each end of thetube 3 so as to be integrated therewith as described above. - In the embodiment, it is assumed that the
pressure application face 2 a of thehousing 1 and thepressure application face 4 b of the pressure application member 4 are cylindrical and that their sectional shapes are straight in the axial direction. The squeezedportion 3 c of thetube 3 is symmetrical with respect to its centerline in the direction of flatness of thetube 3. - On the other hand, as shown in FIG. 4, one of the
pressure application face 2 a of thehousing 1 and thepressure application face 4 b of the pressure application member 4 can have a convex circular arc shape in cross section, and the other can have a concave circular arc shape in cross section adapted for the convex circular shape. In this case, it is preferable that the wall thickness of one of theouter side 3 d and theinner side 3 e of thetube 3, making contact with the concave pressure application face, is made larger, and that the wall thickness of the other, making contact with the convex pressure application face, is made smaller. In FIG. 4, thepressure application face 4 b is made convex, thepressure application face 2 a is made concave, the wall thickness of theouter side 3 d of thetube 3 is made larger, and the wall thickness of theinner side 3 e is made smaller. In the case of this shape, the side that is thin and deformable easily at the time of squeezing, that is, theinner side 3 e in the example shown in FIG. 4, can be deformed and pressed easily against theouter side 3 d with no clearance therebetween as indicated in a chain line. Hence, no large pressure force is required for squeezing. Furthermore, after squeezing, theinner side 3 e returns to its original shape by virtue of its elasticity. - Generally speaking, a thin object having a slightly inflated shape has the property of being deflated abruptly because of a kind of buckling phenomenon when an external pressure larger than the deflation pressure of the object is applied to the object and returning to its original shape abruptly when the external pressure becomes extinct. In the case of this
tube 3, by properly selecting the wall thickness and the inflated shape of theinner side 3 e, theinner side 3 e can be deflated easily by slight pressure application and can immediately return to its original shape when the pressure application ceases. By using this property, it is possible to obtain a tube wherein theinner side 3 e can make completely close contact with theouter side 3 d by applying a small pressure force and theinner side 3 e returns promptly to its original shape after squeezing. This so-called can-deflating effect can be obtained by properly selecting the wall thickness and inflated shape. Hence, an effect similar to this effect can also be obtained even when the wall thickness of theouter side 3 d is equal to that of theinner side 3 e. - FIGS. 5A and 5B show an example wherein the shape returning force of the
tube 3 is improved by using a structure different from the above-mentioned structures. In this example, at least the squeezedportion 3 c of thetube 3, a synthetic resin mold, is covered with arubber tube 8. It is preferable that thisrubber tube 8 has a size that achieves a slightly stretched condition when thetube 3 is covered with therubber tube 8. In this configuration, in a condition wherein thetube 3 is squeezed and flattened as shown in FIG. 5B, an inward contracting stress is produced in the stretchedrubber tube 8 as indicated by the arrows. Hence, the returning force of therubber tube 8 is superimposed on the returning force of thetube 3 itself, whereby thetube 3 can promptly return to its original shape after squeezing. - Unlike the structure wherein the
tube 3 is covered with therubber tube 8 shown in FIGS. 5A and 5B, for example, a structure, in which cushion members made of sponge or the like are disposed at positions making contact with theconnection portions 3 f at both ends of thetube 3 when squeezed and flattened, may be used. In other words, the forces for returning theconnection portions 3 f are generated by the cushion members. Even when this configuration is used, thetube 3 can return promptly to its original shape after squeezing. - As a result, with the above-mentioned configurations, the tube can return promptly to its original shape after the squeezing of the tube is completed, whereby it is possible to obtain an efficient tube pump.
Claims (9)
1. A tube pump comprising a tube disposed in a ring shape along a circular inner circumferential face formed in a housing, said tube being squeezed sequentially in the longitudinal direction thereof by a pressure application member disposed inward so as to feed fluid from the inside of said tube, wherein said tube is formed by blow molding beforehand into a shape adapted for said inner circumferential face of said housing.
2. A tube pump in accordance with claim 1 , wherein said tube is made of a synthetic resin, and a squeezed portion thereof is flat in cross section such that an outer side of said tube on a side of said housing and an inner side of said tube on a side of said pressure application member are joined to each other at acute angles.
3. A tube pump in accordance with claim 2 , wherein the outer side and the inner side of said tube have circular arc shapes in cross section.
4. A tube pump in accordance with claim 2 , wherein the outer side and the inner side of said tube have broken line shapes in cross section.
5. A tube pump in accordance with claim 3 , wherein one of the pressure application face of said inner circumferential face of said housing and the pressure application face of said pressure application member has a convex circular arc shape and the other has a concave circular arc shape in cross section.
6. A tube pump in accordance with claim 5 , wherein either one of the outer side and the inner side of said tube, making contact with said concave pressure application face, has a wall thickness thicker than an other, and the wall thickness of the other, making contact with said convex pressure application face, is thinner.
7. A tube pump in accordance with any one of claims 1 to 6 , wherein the outside of said tube is covered with a rubber tube.
8. A tube pump in accordance with any one of claims 1 to 6 , wherein a connection portion is formed at each end of said tube so as to be integrated therewith.
9. A tube pump in accordance with claim 7 , wherein a connection portion is formed at each end of said tube so as to be integrated therewith.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/326,473 US20030138335A1 (en) | 2000-07-03 | 2002-12-20 | Tube pump |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-200424 | 2000-07-03 | ||
JP2000200424A JP2002021743A (en) | 2000-07-03 | 2000-07-03 | Tube pump |
US09/897,508 US20020001530A1 (en) | 2000-07-03 | 2001-06-29 | Tube pump |
US10/326,473 US20030138335A1 (en) | 2000-07-03 | 2002-12-20 | Tube pump |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/897,508 Continuation-In-Part US20020001530A1 (en) | 2000-07-03 | 2001-06-29 | Tube pump |
Publications (1)
Publication Number | Publication Date |
---|---|
US20030138335A1 true US20030138335A1 (en) | 2003-07-24 |
Family
ID=26595228
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/326,473 Abandoned US20030138335A1 (en) | 2000-07-03 | 2002-12-20 | Tube pump |
Country Status (1)
Country | Link |
---|---|
US (1) | US20030138335A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030190246A1 (en) * | 2002-04-05 | 2003-10-09 | Sigma International | Portable pump for use with IV tubing |
US20070177992A1 (en) * | 2006-02-01 | 2007-08-02 | Seiko Epson Corporation | Tube and tube pump |
US9759210B1 (en) | 2010-06-08 | 2017-09-12 | Stenner Pump Company, Inc. | Peristaltic pump head and related methods |
US20170314544A1 (en) * | 2016-04-29 | 2017-11-02 | Saint-Gobain Performance Plastics Corporation | Peristaltic pump tube with non-uniform lumen profile |
CN108348679A (en) * | 2015-11-20 | 2018-07-31 | 先进微流控技术股份公司 | Micropump |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3192863A (en) * | 1962-03-14 | 1965-07-06 | Grenobloise Etude Appl | Blood pump |
US4512732A (en) * | 1980-04-14 | 1985-04-23 | Wedco Incorporated | Heat treating of material in finely divided form |
US5215450A (en) * | 1991-03-14 | 1993-06-01 | Yehuda Tamari | Innovative pumping system for peristaltic pumps |
US5468129A (en) * | 1994-08-05 | 1995-11-21 | Cole Parmer Instrument Company | Peristaltic pump |
-
2002
- 2002-12-20 US US10/326,473 patent/US20030138335A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3192863A (en) * | 1962-03-14 | 1965-07-06 | Grenobloise Etude Appl | Blood pump |
US4512732A (en) * | 1980-04-14 | 1985-04-23 | Wedco Incorporated | Heat treating of material in finely divided form |
US5215450A (en) * | 1991-03-14 | 1993-06-01 | Yehuda Tamari | Innovative pumping system for peristaltic pumps |
US5468129A (en) * | 1994-08-05 | 1995-11-21 | Cole Parmer Instrument Company | Peristaltic pump |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030190246A1 (en) * | 2002-04-05 | 2003-10-09 | Sigma International | Portable pump for use with IV tubing |
US7059840B2 (en) * | 2002-04-05 | 2006-06-13 | Sigma International | Energy-saving, anti-free flow portable pump for use with standard PVC IV tubing |
US20070177992A1 (en) * | 2006-02-01 | 2007-08-02 | Seiko Epson Corporation | Tube and tube pump |
US7762794B2 (en) * | 2006-02-01 | 2010-07-27 | Seiko Epson Corporation | Tube and tube pump |
US9759210B1 (en) | 2010-06-08 | 2017-09-12 | Stenner Pump Company, Inc. | Peristaltic pump head and related methods |
US10036380B1 (en) | 2010-06-08 | 2018-07-31 | Stenner Pump Company, Inc. | Peristaltic pump head and related methods |
CN108348679A (en) * | 2015-11-20 | 2018-07-31 | 先进微流控技术股份公司 | Micropump |
US20170314544A1 (en) * | 2016-04-29 | 2017-11-02 | Saint-Gobain Performance Plastics Corporation | Peristaltic pump tube with non-uniform lumen profile |
US10557465B2 (en) * | 2016-04-29 | 2020-02-11 | Saint-Gobain Performance Plastics Corporation | Peristaltic pump tube with non-uniform lumen profile |
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Legal Events
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Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |