JP2010196689A - Pump unit, pump, and pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump unit including an outer cylinder and an inner cylinder which is expanded to sufficiently close a flow path cross section when supplying a compressing medium, and to provide a pump and a pump device using the same. <P>SOLUTION: The pump unit 1 includes the outer cylinder 2, and the expandable inner cylinder 3 coaxially provided along the inner peripheral face of the outer cylinder 2. In the inner cylinder 3, a plurality of constrainers 4 are embedded at peripherally uniform spaces while extending in the direction of the axial center thereof. The plurality of pump units 1 are coaxially connected to one another to constitute the pump. When the compressing medium is supplied from a hole 6 to a groove 7, four sections are uniformly expanded in the centripetal direction until front ends which are expanded arrive vicinities of the centers of the pump units 1. Thus, flow paths at the inner periphery sides of the inner cylinders 3 are substantially put into full-closed states. With the expanded inner cylinders 3 switched in sequence, liquid, fluid such as slurry, solid or solid-liquid mixture is efficiently transported. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes an outer cylinder and an inner cylinder, and a medium for pressurization is supplied between the outer cylinder and the inner cylinder to expand the inner cylinder in a centripetal direction so that a fluid such as a liquid, a slurry, a solid, or a solid liquid The present invention relates to a pump unit for transporting a mixture. The present invention also relates to a pump and a pump device using this pump unit.

  JP-A-49-804, JP-A-5-321842, and the like describe pumps that supply a pressurizing medium between an outer cylinder and an inner cylinder to contract the inner cylinder and transport liquid or the like.

  In Japanese Patent Laid-Open No. 49-804, three rubber valves, in which a rubber inner tube provided along the inner peripheral surface of the outer cylinder is expanded in the centripetal direction by air, are connected in series. The inner tube is sequentially expanded to transfer the liquid.

  Japanese Patent Laid-Open No. 5-321842 also performs the same configuration and operation, and uses a silicon rubber tube as the inner cylinder.

JP-A 49-804 JP-A-5-321842

  The inner cylinder of the conventional pump is made of rubber or soft synthetic resin. In the case of this inner cylinder, when a pressurizing medium is press-fitted between the outer cylinder, it rarely expands in the centripetal direction evenly in the circumferential direction. It bends locally in a buckled manner. When the inner cylinder swells unevenly in this way, the cross section of the flow path is not sufficiently closed, and the transport efficiency of liquid or the like becomes low.

  The present invention solves the above-described conventional problems, and when a pressurizing medium is supplied to a pump unit including an outer cylinder and an inner cylinder, the inner cylinder expands so as to sufficiently close the cross section of the flow path. An object is to provide a pump unit, a pump using the pump unit, and a pump device.

  The pump unit according to claim 1 includes an outer cylinder, an inner cylinder provided along an inner peripheral surface of the outer cylinder, and a passage for supplying a pressurizing medium between the inner cylinder and the outer cylinder. The inner cylinder is expandable in the centripetal direction by the pressure of the pressurizing medium, and in the pump unit in which both ends in the cylinder axial direction of the inner cylinder are held by the outer cylinder, the inner cylinder shaft A plurality of restraining bodies extending in the direction of the core line and restraining deformation of the inner cylinder are provided at intervals in the circumferential direction of the inner cylinder.

  A pump unit according to a second aspect is the pump unit according to the first aspect, wherein the inner cylinder is made of rubber or elastomer, and the restraint is made of a linear body and is embedded in the rubber or elastomer. Is.

  According to a third aspect of the present invention, there is provided the pump unit according to the first or second aspect, wherein 4 to 6 of the restraining bodies are provided at equal intervals in the circumferential direction of the inner cylinder.

  A pump according to a fourth aspect comprises a connecting body in which a plurality of pump units according to any one of the first to third aspects are connected.

  According to a fifth aspect of the present invention, there is provided a pump apparatus comprising: the pump according to the fourth aspect; and a pressurizing medium supply / discharge means for supplying and discharging the pressurizing medium between an outer cylinder and an inner cylinder of each pump unit. It is.

  When a pressurizing medium is supplied between the inner cylinder and the outer cylinder of the pump unit of the present invention, the inner cylinder expands in the centripetal direction and closes the flow path. In the present invention, the inner cylinder is provided with a plurality of restraining bodies extending in the cylinder axis direction, and a portion of the inner cylinder between the restraining bodies expands in the centripetal direction. In the present invention, the portion between the restraints is fractionated like a small chamber, and each small chamber-like portion expands equally in the centripetal direction by the pressure of the pressurizing medium. And each small chamber-like part expand | swells so that it may reach the axial center vicinity of a pump unit, and a flow path is obstruct | occluded almost completely.

  Therefore, in a pump formed by connecting a plurality of pump units, a fluid such as a liquid or a slurry, a solid, or a solid-liquid mixture can be efficiently transported.

It is sectional drawing of the cylinder axial center direction of the pump unit which concerns on embodiment. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is a perspective view of an inner cylinder. It is a partial expanded sectional view of an inner cylinder. It is the VI-VI sectional view taken on the line of FIG. 7 which shows the cross section of the pump unit at the time of expansion of an inner cylinder. It is the VII-VII sectional view taken on the line of FIG. It is sectional drawing explaining the action | operation of a pump. It is sectional drawing which shows another embodiment. It is sectional drawing of the cylinder axial center direction of the pump unit which concerns on different embodiment. It is the XI-XI sectional view taken on the line of FIG. It is the XII-XII sectional view taken on the line of FIG. It is sectional drawing of the pump unit at the time of an inner cylinder expansion | swelling. It is sectional drawing of the pump which connected the pump unit of FIG. It is sectional drawing of the pump unit connection part of FIG. It is sectional drawing which shows the ventilation structure in the pump unit connection part of FIG. It is a figure which shows the shape before and behind expansion | swelling of an inner cylinder.

  Hereinafter, embodiments will be described with reference to the drawings.

[First Embodiment]
1 to 8 are for explaining the first embodiment.

  As shown in FIGS. 1 to 3, the pump unit 1 includes an outer cylinder 2 and an inflatable inner cylinder 3 provided coaxially along the inner peripheral surface of the outer cylinder 2. The outer cylinder 2 is made of a material that does not deform depending on the pressure of the pressurizing medium, such as metal or hard synthetic resin. The inner cylinder 3 is made of an expandable material such as rubber or elastomer having a thickness of about 0.2 to 5 mm, for example.

  The inner cylinder 3 only needs to be inflatable by the pressure of the pressurizing medium, and the material and thickness thereof are not limited to those described above.

  A plurality (four in this embodiment) of constraint bodies 4 extending in the axial direction of the cylinder are embedded in the inner cylinder 3 at equal intervals in the circumferential direction.

  The restraint 4 is, for example, a fiber roving (a fiber in which fibers are aligned), a yarn (a twisted one), a cord (a yarn combined), a metal wire, or the like such as carbon fiber, glass fiber, or metal fiber. The tensile elastic modulus is higher than the elastic modulus of the material of the inner cylinder 3.

  The restricting body 4 extends from one end to the other end of the inner cylinder 3 in the cylinder axis direction.

  The inner cylinder 3 can be formed by, for example, applying rubber latex to the outer periphery of the mandrel, then distributing the restraint 4, further applying rubber latex from above, crosslinking, and then pulling out the mandrel. it can. However, the method of forming the inner cylinder is not limited to this, and the inner cylinder can be molded by co-extrusion of a matrix material such as rubber or elastomer and a restraint body such as carbon fiber.

  Both ends of the inner cylinder 3 in the cylinder axial direction are fixed to the outer cylinder 2. In this embodiment, the end portions 3a on both sides of the inner cylinder 3 are bent in the diameter increasing direction, and fixed by, for example, sandwiching the end portions 3a with the end surface of the outer cylinder 2 by the annular end plate 5. Yes. The end plate 5 can be attached to the outer cylinder 2 by fastening it to the outer cylinder 2 with bolts or by screwing the end plate 5 itself into the outer cylinder 2. The attachment method is not limited to this.

  The fixing method of the end 3a of the inner cylinder 3 is not limited to the above method. For example, both end portions of the cylindrical inner cylinder 3 are attached to the inner peripheral surface of the outer cylinder 2 from the inner peripheral side by a presser ring. You may fix by pressing.

  In order to supply and discharge the pressurizing medium between the outer cylinder 2 and the inner cylinder 3, a groove 7 is provided so as to go around the inner peripheral surface of the outer cylinder 2, and the outer circumference of the outer cylinder 2 is extended from the groove 7. A hole 6 is provided so as to penetrate to the surface. By supplying a pressurizing medium such as water, oil, air or the like to the groove 7 through the hole 6 by a cylinder device or the like, the portion of the inner cylinder 3 between the restraining bodies 4 is shown in FIGS. It expands in the centripetal direction. Further, after the inner cylinder 3 is expanded, the pressurizing medium is discharged from the hole 6, so that the inner cylinder 3 contracts and returns to the original cylindrical shape as shown in FIGS.

  A plurality of pump units 1 are connected coaxially as shown in FIG. When the pump units 1 are connected to each other, the circumferential positions of the restraining bodies 4 of the adjacent pump units 1 may coincide with each other (that is, the restraining bodies 4 of the pump units 1 may be aligned in a straight line. Well) it may be displaced in the circumferential direction.

  A pump device is configured by connecting a cylinder device or the like to the hole 6 of each pump unit 1 of the pump via a pressure hose or the like.

  The operation of this pump will be described with reference to FIGS. 8 (a) to (e).

  In FIG. 8, three pump units 1 are connected. (A) In the figure, the inner cylinder 3 of any pump unit 1 is contracted. (B) In the figure, only the inner cylinder 3 of the left pump unit 1 expands, (c) In the figure, only the inner cylinder 3 of the left and center pump units 1 expands, and in the (d) figure, the center and right pumps Only the inner cylinder 3 of the unit 1 is expanded, and only the inner cylinder 3 of the right pump unit 1 is expanded in FIG.

  By sequentially expanding the respective inner cylinders 3 in this manner, fluids such as liquids, gas-liquid mixed fluids, slurries, and solids, or solid-liquid mixtures (hereinafter abbreviated as fluids, etc.) from the left to the right in FIG. Is transported).

  In this embodiment, the inner cylinder 3 is divided into four in the circumferential direction by four restraining bodies 4. When the pressurizing medium is supplied from the hole 6 to the groove 7, each of the four partition parts expands equally in the centripetal direction as shown in FIG. 7, and the tip in the expansion direction reaches near the center of the pump unit 1. For this reason, the flow path on the inner peripheral side of the inner cylinder 3 is substantially fully closed. Therefore, by switching the expanding inner cylinder 3 in order as shown in FIG. 8, fluid or the like is efficiently transported. As shown in FIG. 7, a very small gap is generated at the tip of each expanded section, but the flow passage cross-sectional area of this gap is very small, which is substantially the same as in the fully closed state.

  Of the inner peripheral surface of the inner cylinder 3, an intermediate portion between the restraining bodies 4 and 4 adjacent to each other in the circumferential direction of the inner cylinder 3 (that is, the inner cylinder 3 swells most to the center side when the inner cylinder 3 expands). A sponge or the like may be attached to the protruding portion, and the gap near the center of the inner cylinder 3 may be completely closed by the sponge or the like when the inner cylinder 3 is expanded.

  Although three pump units 1 are connected in FIG. 8, it is obvious that four or more pump units 1 may be used.

  In the above embodiment, the inner cylinder 3 is divided into four sections by the four restraining bodies 4, but may be five or six sections. As a result of various experiments conducted by the inventor, in the two or three sections, each small section may not expand evenly in the centripetal direction. In the case of seven or more sections, the pressure of the pressurizing medium for expanding each section to the vicinity of the center of the pump unit becomes considerably high. Therefore, the number of sections, that is, the number of the restraining bodies 4 is preferably about 4 to 6, particularly 4 or 5.

[About the preferred method for calculating the length and diameter of the inner cylinder 3 and the number of restraining bodies 4]
Hereinafter, a method for calculating the length and diameter of the inner cylinder 3 and the number (number) of the restraining bodies 4 will be described with reference to FIG. FIG. 17 (a) is a perspective view of the inner cylinder 3 before expansion, FIG. 17 (b) is a cross-sectional view taken along the line BB of FIG. 17 (a), and FIG. FIG. 17 (b) is a cross-sectional view of the same part as FIG. 17 (b) showing the state expanded to the shape, and FIG. 17 (d) shows the state where the inner cylinder 3 is expanded so as to completely block the central portion of the pump unit. FIG. 3 is a cross-sectional view taken along a cylinder axis of the inner cylinder 3. In addition, since the thickness of the inner cylinder 3 is very small with respect to the length and diameter of the inner cylinder 3, hereinafter, the thickness of the inner cylinder 3 is assumed to be negligible.

As shown in FIG. 17 (a), the length when the inner cylinder 3 is not expanded is L, and the diameter is D. As shown in FIG. 17 (b), i restraining bodies 4 (4 ₁ , 4 ₂ , 4 ₃ ,..., 4 _i ) are arranged in the circumferential direction of the inner cylinder 3 at substantially equal intervals. Yes. In FIGS. 17 (b) and 17 (c), the two-dot chain line indicates the inner cylinder 3 before expansion, the solid line indicates the inner cylinder 3 during expansion, and the one-dot chain line indicates the final expansion shape of the inner cylinder 3 (inner cylinder 3). Shows a state in which the center portion of the pump unit is fully expanded. The arrow in FIG. 17B indicates the direction of pressure applied to the inner surface of the inner cylinder 3 when the inner cylinder 3 is expanded.

From the geometrical consideration of FIG. 17 (b), the conditions for the inner cylinder 3 to expand so as to completely block the central portion of the pump unit are as follows.
iD ≧ πD
That is,
i ≧ π
It is. Here, since i is an integer,
i ≧ 4 (book) (1)
Is guided.

As shown in FIG. 17 (b), the inner cylinder 3 is correctly deformed when expanded (that is, as shown in FIG. 17 (c), a crease or the like is formed in each section of the inner cylinder 3 defined by the restraining bodies 4. In order for each section to expand toward the center of the pump unit as a whole without generating), the following equation must be satisfied.
L ≧ πD / i (2)
Especially from the rule of thumb,
L / (πD / i) = 1.5
Is preferred.

When the inner cylinder 3 is expanded, assuming that the cross-sectional shape of the outer peripheral surface of the inner cylinder 3 in the direction of the cylinder axis is a shape along a perfect circle, the geometrical consideration in FIG. The conditions for the cylinder 3 to expand so as to completely block the central portion of the pump unit are as follows.
L ≧ D (3)

  Therefore, by determining the length L and diameter D of the inner cylinder 3 and the number i of the restraining bodies 4 so as to satisfy all of the above formulas (1) to (3), the center of the pump unit is expanded when the inner cylinder 3 is expanded. The portion can be configured to be substantially completely closed by the expanded inner cylinder 3.

[Second Embodiment]
FIG. 9 illustrates the second embodiment.

  In the above embodiment, the inner cylinders 3 of the plurality of pump units 1 are sequentially expanded. However, like the pump unit 11 of FIG. The presser ring 14 may be disposed, and a plurality of inflatable portions that can be independently expanded may be provided in the direction of the cylinder axis of one pump unit 11.

  In the pump unit 11, an inner cylinder 13 is disposed along the inner periphery of the outer cylinder 12, and both end portions 13 a of the inner cylinder 13 are fixed to the outer cylinder 12 by end plates 15. 4 (or 5 to 6) restraining bodies 4 (not shown in FIG. 9) are embedded in the inner cylinder 13 as in FIGS.

  A holding ring 14 is arranged at an interval in the cylinder axis direction of the pump unit 11 and presses the inner cylinder 13 against the inner peripheral surface of the outer cylinder 12. Circumferential grooves 17 are provided between the presser rings 14 and between the presser ring 14 and the end plate 15, and each groove 17 communicates with the outer peripheral surface of the outer cylinder 12 through the hole 16. By supplying and discharging the pressurizing medium to and from the groove 17, it is possible to expand the portions of the inner cylinder 13 between the press ring 14 and the end plate 15 and between the press rings 14. In FIG. 9, a state in which the leftmost portion expands is shown by a two-dot chain line. The other parts are similarly inflatable.

  Therefore, similarly to FIG. 8, for example, by expanding the inner cylinder 13 in order from the left side, a transported body such as a fluid can be transported to the right. It should be noted that a plurality of pump units 11 shown in FIG.

[Third Embodiment]
FIGS. 10 to 16 illustrate the third embodiment.

  In the pump unit 21 of this embodiment, the inner diameter of the outer cylinder 22 is larger than the outer diameter of the non-expanded inner cylinder 23. An annular end ring 24 is provided at each end of the pump unit 21 in the cylinder axis direction. Both end sides of the outer cylinder 22 are superimposed on the outer peripheral surface of each end ring 24 and fixed by fixing means (not shown) such as a band. Both ends of the inner cylinder 23 pass through the inner peripheral side of each end ring 24 and wrap around the outer end face of each end ring 24. That is, the pump unit 21 has an empty chamber 25 surrounded by an outer cylinder 22, an inner cylinder 23 and a pair of end rings 24.

  Even in this embodiment, the inner cylinder 23 is embedded with four constraint bodies 26 extending in the cylinder axis direction at equal intervals in the circumferential direction. It is not limited to this.

  A circumferential concave step portion 24a (FIGS. 15 and 16) is provided at an outward corner edge of the inner periphery of the end ring 24 on one end side of the pump unit 21. On the outward corner edge of the inner periphery of the end ring 24 on the other end side of the pump unit 21, a circumferential convex portion 24b (FIGS. 15 and 16) is provided so as to project outward in the cylinder axis direction. . When the pump units 21 and 21 are arranged coaxially and face each other, the circumferential convex portion 24 b of one pump unit 21 is engaged with the circumferential concave step portion 24 a of the other pump unit 21. Both ends of the inner cylinder 23 are clamped by the convex portion 24 b and the concave step portion 24 a and are firmly fixed to the end ring 24.

  A hole 27 is provided in the end ring 24 in the direction of the cylinder axis. A plurality of the holes 27 are provided at intervals in the circumferential direction. As shown in FIG. 15, the pump units 21 are connected to some holes 27 through bolts 28. As shown in FIG. 16, a vent pipe 29 is passed through the other hole 27, and the vacant chambers 25 of the pump unit 21 are communicated with each other, or a tube 30 is connected to the vent pipe 29.

  A pump is constructed by connecting a plurality of pump units 21 coaxially as shown in FIG. When the pump units 21 are connected to each other, the circumferential positions of the restraining bodies 26 of the adjacent pump units 21 may coincide with each other (that is, the restraining bodies 26 of the pump units 21 may be aligned in a straight line. Well) it may be displaced in the circumferential direction.

  A pump device is configured by connecting a cylinder device or the like to the vent pipe 29 of the pump unit 21A on the left side of FIG.

  As shown in FIG. 14, when three pump units 21 are connected to form a pump, the vacant chamber 25 of the pump unit 21 (21A) at the left end in the figure is connected to the cylinder via the vent pipe 29 at the left end. It is connected to an air supply / discharge device (not shown) such as a device. The empty chamber 25 of the central pump unit 21 (21B) is connected to the air supply / discharge device via a tube 30 (30A) routed around the pump unit 21A. The vacant chamber 25 of the pump unit 21 (21C) at the right end is connected to the air supply / discharge device via a tube 30 (30B) routed in the pump units 21A and 21B. Note that both ends of the tubes 30A and 30B in the pump units 21A and 21B are connected to the vent pipe 29, respectively. The tubes 30A and 30B are made of a material that can be flexibly deformed, such as silicone rubber, have a required thickness, and are not substantially expanded or contracted depending on air pressure.

  Since the tubes 30A and 30B for ventilation are routed into the empty chambers 25 of the pump units 21A and 21B as described above, the tubes 30A and 30B are not exposed outside the pump units 21A to 21C. The appearance of the units 21A to 21C becomes neat. In addition, since the tubes 30A and 30B are prevented from being caught when the pump is transported, the pump is easy to handle.

  When air is supplied to or discharged from the empty chamber 25 of the left pump unit 21A through the left end side vent pipe 29, the inner cylinder 23 expands or contracts.

  When air is supplied or discharged into the vacant chamber 25 of the central pump unit 21B via the tube 30A of the pump unit 21A, the inner cylinder 23 expands or contracts. When air is supplied or discharged through the tube 30B of the pump units 21A and 21B into the empty chamber 25 of the right pump unit 21C, the inner cylinder 23 expands or contracts.

  Note that the holes 27 that are not used for inserting the ventilation pipes and bolts are closed by the blinds 31.

  The operation of this pump device is the same as that of the pump device of the first embodiment described above. That is, by expanding the pump units 21A to 21C in this order, a transported object such as a fluid is transported from the left side to the right side in FIG. In addition, by expanding the pump units 21C to 21A in this order, transportation is performed from the right side to the left side in FIG. Even in the pump device including the pump unit 21, the same effects as the pump device according to the first embodiment can be obtained.

  Note that the ventilation tube 30 may be directly connected to each pump unit 21 by being routed outside the pump unit 21.

  Each of the above embodiments is an example of the present invention, and the present invention may be configured other than illustrated. For example, the end surfaces of the outer cylinders 2, 12, and 22 of the pump unit are not limited to planes perpendicular to the cylinder axis direction, and may be inclined surfaces that are oblique to the cylinder axis direction. If it does in this way, the pump bent in the longitudinal direction can be constituted by connecting a pump unit.

  In the present invention, the restraining body may be a rod-shaped body that is provided along the inner peripheral surface of the inner cylinder and presses the inner cylinder from the inner peripheral side. You may comprise so that a restraint body may be fixed to the outer peripheral surface of an inner cylinder, and this restraint body may be fixed to an outer cylinder.

1,11,21 Pump unit 2,12,22 Outer cylinder 3,13,23 Inner cylinder 4,26 Constraint body 5,15 End plate 6,16 hole 7,17 Groove 14 Presser ring 24 End ring 25 Empty room 27 Hole 28 Bolt 29 Ventilation tube 30 Tube

Claims (5)

An outer cylinder, an inner cylinder provided along the inner peripheral surface of the outer cylinder, and a passage for supplying a pressurizing medium between the inner cylinder and the outer cylinder,
In the pump unit in which the inner cylinder is expandable in the centripetal direction by the pressure of the pressurizing medium, and both ends of the inner cylinder in the cylinder axial direction are held by the outer cylinder,
A pump unit characterized in that a plurality of restraining bodies extending in the axial direction of the inner cylinder and restraining deformation of the inner cylinder are provided at intervals in the circumferential direction of the inner cylinder.   2. The pump unit according to claim 1, wherein the inner cylinder is made of rubber or elastomer, and the restraining body is made of a linear body and embedded in the rubber or elastomer.   3. The pump unit according to claim 1, wherein 4 to 6 of the restraining bodies are provided at equal intervals in the circumferential direction of the inner cylinder.   A pump comprising a connecting body in which a plurality of pump units according to any one of claims 1 to 3 are connected.   5. A pump apparatus comprising: the pump according to claim 4; and a pressurizing medium supply / discharge means for supplying and discharging a pressurizing medium between an outer cylinder and an inner cylinder of each pump unit.

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