JP5991608B2 - Pumping unit - Google Patents

Description

  The present invention relates to a pump unit for supplying a fluid by supplying a pressurizing medium between an outer cylinder and an inner cylinder and expanding the outer cylinder and the inner cylinder or the inner cylinder.

FIG. 11A is a diagram showing a configuration of a pump unit 50 including an inner cylinder 51 and an outer cylinder 52 made of a rubber member in which a number of highly elastic fibers extending in the axial direction are embedded. The figure is an AA cross section of the figure (a).
The pump unit 50 is a pressurizing medium through an air introduction hole 54H provided in one flange 54 from a compressed air supply / exhaust means (not shown) in an air chamber 53 provided between the inner cylinder 51 and the outer cylinder 52. The compressed air is supplied to expand the inner cylinder 51 and the outer cylinder 52, and the fluid fed into the flow path 55 formed from the inner wall of the inner cylinder 51 from one end side of the inner cylinder 51 is supplied to the inner cylinder 51. Discharge from the other end side. Note that reference numeral 54h in the figure indicates that when a plurality of pump units 50 are connected in the axial direction, an unillustrated air tube for sending compressed air to a pump unit connected to the subsequent stage of the pump unit 50 is passed. It is a hole.
As shown in FIG. 11C, the inner cylinder 51 includes a plurality of restraining bodies 56 that extend in a direction parallel to the axial direction of the inner cylinder 51 and restrain deformation of the inner cylinder 51 at equal intervals in the circumferential direction. The book is provided. The restraining body 56 restricts and restrains the expansion of the inner cylinder 51 in the axial direction. When the inner cylinder 51 is inflated, the restraining body 56 is, as shown in FIGS. The deformation of the inner cylinder 51 is restrained, and the inner cylinder 51 is partitioned into a plurality of expansion regions 511 to 514.
As a result, when compressed air that is a pressurizing medium is supplied to expand the inner cylinder 51, the inner cylinder 51 has a plurality of expansion areas 511 to 514 partitioned by the restraining body 56 inside the unit that becomes the flow path 55. Since it is in the closed state, the fluid can be efficiently conveyed from one end side of the pump unit 50 to the other end side.

On the other hand, the inner cylinder 51 and the outer cylinder 52 do not expand in the axial direction of the pump unit 50, and when the inner cylinder 51 and the outer cylinder 52 expand, the pump unit 50 contracts in the axial direction. Accordingly, when the fluid is pushed out from the inner cylinder 51, the length of the pump unit 50 is shortened, so that the fluid can be efficiently conveyed.
Therefore, by connecting a plurality of such pump units 50 in the axial direction, a peristaltic pump device that can efficiently transport a fluid such as a liquid or a solid-liquid mixture along the connecting direction of the pump units 50 is configured. (For example, refer to Patent Document 1).

JP 2010-203400 A

  However, in the conventional pump unit 50, it is difficult to control the fluid conveyance state such as completely closing the inside of the unit or conveying only the solid content of the solid-liquid mixture.

  The present invention has been made in view of the conventional problems, and an object of the present invention is to provide a pump unit capable of controlling the fluid conveyance state.

In order to solve the above-described problems, the present invention provides an outer cylinder, an inner cylinder provided on the inner peripheral side of the outer cylinder, a fixing member that fixes both axial ends of the inner cylinder and both axial ends of the outer cylinder. When, a pump unit for conveying the inner cylinder and a pressurizing passage for supplying pressurizing medium between said outer cylinder, fluid inner cylinder is inflated by pressurizing medium, the inner tube, A plurality of restraining bodies which are provided at intervals in the circumferential direction of the inner cylinder, extend along a direction parallel to the axial direction of the inner cylinder and restrain deformation of the inner cylinder, and a restraining body adjacent in the circumferential direction. A plurality of inner protrusions that are provided at intermediate positions and protrude toward the inner peripheral side of the inner cylinder, and the inner protrusions abut each other when the inner cylinder is inflated to close the inner cylinder. And
According to the above configuration, the inner projecting portion is provided at an intermediate position between the restraint body and the restraint body, and each part of the inner cylinder (hereinafter referred to as an expansion region) partitioned by the restraint body is inflated around the inner projecting portion. By doing so, each expansion region can be expanded uniformly. In this case, since the inner projecting portion itself fills the space of the channel not closed by the inner cylinder, the closing rate R _L [%] and the volume exclusion rate R _E [%] inside the unit serving as the channel are set. It can be almost 100%.
Further, a plurality provided, net-like gap between the respective portions of the inner cylinder divided by the restraint body by contacting the inwardly projecting portions upon inflation during the inner-side projection and the restraining member and the restraint member In this way, it is possible to control the fluid conveyance state such as filtering the solid-liquid mixture.

The closing rate R _L [%] is an amount representing the closing ratio inside the unit when the inner cylinder expands, and when the unit is viewed from the axial direction as shown in FIGS. 13 (a) and 13 (b). When the opening area of the normal flow path of the inner cylinder 11 is S ₀ [m ² ] and the opening area during expansion is S _p [m ² ], it is expressed by the following formula (1).
R _L [%] = {(S ₀ −S _p ) / S ₀ } × 100 (1)
The closing rate R _L [%] represents the performance of the unit as a valve.
Reference numeral 12 denotes an outer cylinder, reference numeral 18 denotes an air chamber, and reference numeral 19 denotes a fluid flow path.
The volume exclusion rate R _E [%] is an amount that represents the rate of volume change inside the unit (flow path 19) when the inner cylinder 11 is expanded, and as shown in FIGS. 14 (a) and 14 (b), When the volume of the channel 19 at the time is V ₀ [m ³ ] and the volume of the channel 19 at the time of expansion is V _p [m ³ ], it is expressed by the following equation (2).
R _E [%] = {(V ₀ −V _p ) / V ₀ } × 100 (2)
The volume exclusion rate R _E [%] represents the efficiency of pushing out the fluid inside the unit.

The invention of the present application is characterized in that the restraining body is a carbon roving fiber.
Thus, if the carbon roving fiber which is thin and has high strength is used as the restraint, the closing ratio when the inner cylinder is expanded can be increased and the durability of the restraint can be improved.
The present invention is characterized in that the outer cylinder includes a rubber member and a highly elastic fiber embedded in the rubber member and extending in a circumferential direction of the outer cylinder.
When the outer cylinder having such a configuration is used, the axial length of the pump unit can be contracted when the outer cylinder and the inner cylinder are expanded. Therefore, when the outer cylinder and the inner cylinder expand and push out the fluid from the inside of the unit, the unit length is shortened, so that the fluid can be efficiently conveyed.
The summary of the invention does not list all necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

It is a figure which shows the structure of the pump unit which concerns on Embodiment 1 of this invention. It is a figure which shows an example of an inner cylinder. It is a figure which shows the detail of protrusion. It is a figure which shows an example of an outer cylinder. It is a figure for demonstrating the effect | action of a processus | protrusion. It is a figure which shows the other form of protrusion. It is a figure which shows one structure of a compressed air supply / discharge means. It is a figure which shows operation | movement of the pump formed by connecting the pump unit which has an inner cylinder by this invention in series. It is a figure which shows the structure of the inner cylinder which concerns on Embodiment 2. FIG. FIG. 10 is a diagram showing an operation of the inner cylinder according to the second embodiment. It is a figure which shows the structure of the conventional pump unit. It is a figure for demonstrating operation | movement of the conventional pump unit. It is a figure for demonstrating a closing rate. It is a figure for demonstrating a volume exclusion rate. It is a figure which shows the relationship between viscosity and volumetric efficiency.

  Hereinafter, the present invention will be described in detail through embodiments, but the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

Embodiment 1 FIG.
1A to 1C are views showing a pump unit 10 according to the first embodiment. The pump unit 10 includes an inner cylinder 11, an outer cylinder 12, upstream and downstream flanges 13A and 13B, and FIG. Is provided.
The inner cylinder 11 is a cylindrical member made of a rubber member such as natural latex rubber or silicone rubber, for example, and both end portions in the axial direction of the inner cylinder 11 are provided on the inflow side of the upstream flange 13A. The recess 13k and the recess 13k provided on the discharge side of the downstream flange 13B are fixed by the inner fixing ring 14.
As shown in FIGS. 2A to 2C, the inner cylinder 11 includes a plurality of restraining bodies 15 extending along the axial direction of the inner cylinder 11 at intervals in the circumferential direction, and the inner cylinder 11. And a protrusion 16 as an inner protrusion provided at intervals in the circumferential direction. Each protrusion 16 is provided at a position in the middle between the two restraining bodies 15 and 15 adjacent to each other.
In this example, a low ammonia natural latex rubber was used as the rubber member, and a thin and high strength carbon roving fiber was used as the restraining body 15.
Since the carbon roving fiber is thin and has high strength, it is possible to increase the closing rate when the inner cylinder is expanded and to improve the durability of the restraint.
The number i of the restraining bodies 15 is preferably i ≧ 4 from the condition that when the inner cylinder 11 is expanded, the inside of the inner cylinder 11 is completely closed and does not loosen. In this example, the number of the restraints 15 is set to 4 which is the minimum number that satisfies the above-described conditions.

As shown in FIGS. 2A to 2C, the protrusion 16 has a mountain shape in cross section and protrudes to the inner peripheral side of the inner cylinder 11.
The protrusions 16 are positioned at intermediate positions between the two adjacent restraining bodies 15, 15 of the restraining bodies 15 when viewed from the axial direction of the inner cylinder 11. Therefore, the number of the protrusions 16 is equal to the number of the restraining bodies 15. Further, the protrusion 16 extends in parallel along the axial direction of the inner cylinder 11, and the position thereof is preferably near the central portion in the axial direction of the inner cylinder 11.
Further, the length l _g of the protrusion 16 only needs to be about 15% or more of the axial length l of the inner cylinder 11, and the height h _g It is preferable that the thickness is equal to or greater than the thickness of the cylinder 11. Moreover, there is no restriction | limiting in particular about the apex angle of a mountain shape, However, The magnitude | size of an apex angle should just exist in the range of 45 degrees-120 degrees.
In this example, as shown again in FIG. 3 (a), the protrusion 16 having a mountain-shaped cross section extending in a direction parallel to the axial direction of the inner cylinder 11 is provided, but FIGS. 3 (b) and 3 (c). As shown in FIG. 5, a 16-m polygonal protrusion 16m or a semi-circular protrusion 16n may be provided.

  As shown in FIGS. 4A to 4C, the outer cylinder 12 includes high-elastic fibers 12k extending in the axial direction between two cylindrical rubber members 12a and 12b made of low ammonia natural latex rubber. A plurality of fiber layers embedded in the circumferential direction are provided, and both end portions in the axial direction of the outer cylinder 12 are outer fixing rings 17 (see FIG. 1) on the outer peripheral sides of the upstream and downstream flanges 13A and 13B, respectively. ). As the high elastic fiber 12k, carbon fiber, glass fiber, aramid fiber or the like is preferably used.

As shown in FIG. 1, the upstream flange 13A and the downstream flange 13B include an air inflow hole 13H and a plurality of through holes 13h.
An air chamber 18 as a pressurizing passage for supplying compressed air, which is a pressurizing medium, is formed by the outer peripheral side of the inner cylinder 11, the inner peripheral side of the outer cylinder 12, the upstream flange 13A, and the downstream flange 13B. The inner peripheral side of the inner cylinder 11 and the upstream flange 13A and the downstream flange 13B form a flow path 19 for transporting a fluid such as a liquid or a solid-liquid mixture. The flow path 19 may be hereinafter referred to as “unit inside”.

The air inflow hole 13H is a hole for introducing the compressed air sent from the compressed air supply / exhaust means (not shown) into the air chamber 18, and the through holes 13h are connected when a plurality of pump units 10 are connected in the axial direction. It is a hole for passing an air tube (not shown) for sending the compressed air to the pump unit connected to the subsequent stage of the pump unit 10.
Reference numeral 13p denotes an engaging concave portion provided on the inflow side of the upstream flange 13A, and reference numeral 13q denotes an engaging convex portion provided on the discharge side of the downstream flange 13B. When a plurality of pump units 10 are connected, the plurality of pump units 10 are connected to the inner cylinder 11 by engaging the engaging convex portion 13q of the upstream pump unit and the engaging concave portion 13p of the downstream pump unit. And it connects with the axial direction of the outer cylinder 12. FIG.

Next, the operation at the time of expansion of the inner cylinder 11 and the outer cylinder 12 will be described.
As shown in FIGS. 5A and 5B, when compressed air is introduced into the air chamber 18, the inner cylinder 11 expands with the restraining body 15 as a starting point at four points in the circumferential direction. Further, the inner cylinder 11 is expanded and deformed so as to be divided into a plurality of expansion regions 111 to 114 by the restraining body 15 and expand.
Moreover, since the protrusion 16 is provided on the inner wall side of the inner cylinder 11, when compressed air is introduced into the inner cylinder 11, pressure in a direction perpendicular to the surface also acts on a portion where the protrusion 16 exists, When the inner cylinder 11 is inflated, the projection 16 itself fills the space not closed by the inner cylinder 11, so that the closing rate and the volume exclusion rate can be almost 100%.

On the other hand, the outer cylinder 12 is non-extensible in the axial direction due to the high elastic fiber 12k, and therefore contracts in the axial direction while expanding in the radial direction.
That is, as shown in FIGS. 5 (a) and 5 (b), the outer cylinder 12 expands radially outward of the pump unit 10, and the inner cylinder 11 has a plurality of expansion regions 111 to 114 partitioned by the restraining body 15. While expanding radially inwardly, the entire pump unit 10 contracts in the axial direction.
Thereby, in the inner cylinder 11, at the time of the maximum expansion, the inside of the unit that becomes the flow path can be almost fully closed by the expansion regions 111 to 114, and the entire pump unit 10 contracts in the axial direction. The fluid can be efficiently transferred from one end side of the pump unit 10 to the other end side.

In addition, as an inner side protrusion part, it is not restricted to the thing of the form extended in the axial direction of the inner cylinder 11, like protrusion 16,16m, 16n shown to Fig.3 (a)-(c), FIG. A truncated cone-shaped protrusion 16p as shown in FIG.
The frustoconical protrusion 16p only needs to have a certain size at the center in the circumferential direction. Further, the number of the truncated cone-shaped protrusions 16p may be one. However, when the length of the inner cylinder 11 in the axial direction is long, a plurality of the cone-shaped protrusions 16p are spaced at intervals in the axial direction of the inner cylinder 11. It may be provided.

  Thus, in the first embodiment, the outer cylinder 12, the inner cylinder 11 provided on the inner peripheral side of the outer cylinder 12, both axial ends of the inner cylinder 11, and both axial ends of the outer cylinder 12 In the pump unit 10 provided with the upstream and downstream flanges 13A and 13B which are fixing members for fixing the inner cylinder 11, the inner cylinder 11 is provided in the circumferential direction of the inner cylinder 11 with an interval in the axial direction of the inner cylinder 11. A constraining body 15 extending along the constraining body 15 is provided to constrain the deformation of the inner cylinder 11, and is disposed in the middle of the constraining body 15 at a distance in the circumferential direction of the inner cylinder 11 and protrudes toward the inner peripheral side of the inner cylinder 11. Since the mountain-shaped protrusions 16 are provided, the protrusions 16 come into contact with each other at the center when the inner cylinder 11 expands, and the flow path 19 is completely closed. Therefore, the closing rate and the volume exclusion ratio of the inner cylinder 11 are improved. The fluid can be transported more efficiently.

FIG. 7 is a diagram showing a configuration of a peristaltic pump 20 formed by connecting a plurality of pump units 10 in series and a compressed air supply / discharge unit 30 used for operating the peristaltic pump 20.
In this example, the compressed air supply / exhaust means 30 having an exhaust system is used to forcibly exhaust the air in the air chamber 18, so that the fluid to be transported has a particularly high viscosity. A mode in which the return (restoration) of the inner cylinder 11 at the time of conveyance can be accelerated and the conveyance efficiency can be improved will be described. Of course, the exhaust system may not be used depending on the fluid.
Here, a case where there are six pump units 10 will be described. Hereinafter, the six pump units constituting the peristaltic pump 20 are referred to as first to sixth units 201 to 206.

  The compressed air supply / discharge means 30 includes a compressor 31 that supplies compressed air, proportional solenoid valves 321-326, an air pump 33, an air tank 34, an air regulator 35, three-port solenoid valves 361-366, and a proportional solenoid valve. The control means 37 which controls 321-326 and the 3 port solenoid valves 361-366, and the air tubes 371-376 are provided.

The compressed air supply / discharge means 30 sends proportional control valves 321 to 326 control signals for controlling the proportional solenoid valves 321 to 326 and the three-port solenoid valves 361 to 366 based on a solenoid valve control program stored in the control means 37 in advance. And it outputs to 3 port solenoid valves 361-366, and controls expansion and contraction of the 1st-6th units 201-206.
The 3-port solenoid valves 361 to 366 are connected to the air tubes 371 to 376, the proportional solenoid valves 321 to 326, and the air regulator 35, and open and close the passages between the proportional solenoid valves 321 to 326 and the air tubes 371 to 376. The passage between the air regulator 35 and the air tubes 371 to 376 is opened and closed.
When the proportional solenoid valves 321 to 326 are opened, the air pressure of the compressed air discharged from the compressor 31 is adjusted to a pressure corresponding to the control signal to the air chambers 18 of the first to sixth units 201 to 206. Supply.
When the passage between the air regulator 35 and the air tubes 371 to 376 is opened, the compressed air introduced into the air chamber 18 is forcibly sucked by the air pump 33. As a result, the pressure in the air chamber 18 is The pressure decreases to the set pressure of the air regulator 35 set lower than the external pressure. The set pressure of the air regulator 35 is set according to the negative pressure generated in the first to sixth units 201 to 206 (in the flow path).
As described above, when the proportional solenoid valves 321 to 326 are closed, if the air in the air chamber 18 is forcibly sucked by the air pump 33, the viscosity of the high-viscosity fluid causes the inner cylinder 11 in an expanded state. Even if the restoration to the initial state (the state before the introduction of compressed air) is hindered, the inner cylinder 11 can be quickly returned to the initial state.
In this example, the air tubes 371 to 376 connect the first to sixth units 201 to 206, the compressor 31, and the air pump 33 via the three-port solenoid valves 361 to 366, respectively. The supply of compressed air to the air chamber 18 of the first to sixth units 201 to 206 and the exhaust of compressed air from the air chamber 18 are controlled independently.

FIG. 15 shows the experimental results showing the relationship between the viscosity (Viscosity) of the fluid introduced into the peristaltic pump 20 having the compressed air supply / discharge means 30 and the volume efficiency. The graph in the figure is a numerical representation of the volumetric efficiency for each of the three types of fluids having different viscosities. The volumetric efficiency indicates the ratio of the flow rate actually discharged when the theoretically dischargeable flow rate is 100%. The theoretical flow rate is determined by shape factors such as the diameter and length of the pump, and the operation pattern and operation interval of the pump.
As shown in the figure, it is understood that when the forced suction by the compressed air supply / exhaust means 30 is not executed, the volumetric efficiency gradually decreases as the fluid viscosity increases.
On the other hand, when forced suction by the compressed air supply / discharge means 30 is executed, the flow rates of the three types of fluids converge at substantially the same value regardless of the viscosity of the fluid. It can be seen that the internal volume of the tube is fully utilized. That is, according to the peristaltic pump 20 that executes forced suction, the fluid can be stably conveyed without depending on the viscosity of the fluid.

Next, the operation of the peristaltic pump 20 will be described.
First, as shown in FIG. 8A, the peristaltic pump 20 is set so that the connecting direction of the first to sixth units 201 to 206 is a vertical direction, and the first pump unit that is the lowest stage pump unit. The unit 201 is installed in the liquid 39 stored in the water tank 38 shown in FIG. 7, and the liquid is introduced into the first unit 201. In the initial state, since the three-port solenoid valve 361 is open on the compressor 31 side and the proportional solenoid valves 321 to 326 are closed, the inner cylinders 11 of the first to sixth units 201 to 206 are all contracted. Is in a state.
Next, as shown in FIG. 8 (b), the proportional solenoid valve 321 is opened, compressed air is sent into the air chamber 18 of the first unit 201, and only the first unit 201 is inflated. The fluid inside is pushed into the second unit 202.
Next, as shown in FIG. 8C, the proportional solenoid valve 322 connected to the air tube 372 is opened while the inner cylinder 11 of the first unit 201 is expanded, and the air chamber of the second unit 202 is opened. The compressed air is sent to 18, the second unit 202 is expanded, and the fluid in the second unit 202 is pushed out into the third unit 203.
Next, as shown in FIG. 8D, the proportional solenoid valve 323 connected to the air tube 373 is opened while the second unit 202 is inflated, and compressed into the air chamber 18 of the third unit 203. Air is sent to expand the third unit 203 and push the fluid in the third unit 203 into the fourth unit 204. At this time, the proportional solenoid valve 321 to which the air tube 371 is connected is closed and the three-port solenoid valve 361 is switched to the air pump 33 side. Thereby, the compressed air in the air chamber 18 of the first unit 201 is forcibly sucked by the air pump 33 and is reduced to the set pressure of the air regulator 35, so that the inner cylinder 11 and the outer cylinder 12 easily contract. . Therefore, a new liquid 39 can be quickly introduced into the first unit 201.
In addition, after the inner cylinder 11 and the outer cylinder 12 are contracted, it is preferable to switch the 3-port solenoid valve 361 to the compressor 31 side again.

Next, as shown in FIG. 8E, while the third unit 203 is expanded, the fourth unit 204 is expanded to push the fluid in the fourth unit 204 into the fifth unit 205, and The second unit 202 is contracted. Note that the compressed air in the air chamber 18 of the second unit 202 is forcibly sucked even when the second unit 202 contracts. Hereinafter, similarly, when each unit contracts, forced air intake by the air pump 33, the air tank 34, and the air regulator 35 is executed.
Next, as shown in FIG. 8 (f), the fifth unit 205 is expanded while the fourth unit 204 is expanded, and the fluid in the fifth unit 205 is pushed into the sixth unit 206. Three units 203 are contracted.
Next, as shown in FIG. 8G, the sixth unit 206 is expanded while the fifth unit 205 is expanded, and the fluid in the sixth unit 206 is pushed out of the peristaltic pump 20. The fourth unit 204 is contracted.
Next, as shown in FIG. 8 (h), the first unit 201 is expanded while the sixth unit 206 is expanded, and the fluid in the first unit 201 is pushed into the second unit 202, and the first unit 201 is expanded. 5 The unit 205 is contracted.
The state shown in FIG. 8H is the same as the state shown in FIG. 8B except that the sixth unit 206 is expanded. Therefore, next, as shown in FIG. 8C, the sixth unit 206 is contracted and the second unit 202 is expanded while the first unit 201 is expanded, so that the fluid in the second unit 202 is expanded. Is pushed into the third unit 203.
Hereinafter, by repeating the operations of FIG. 8C to FIG. 8H, the fluid introduced into the first unit 201 can be discharged from the sixth unit 206 to the outside of the peristaltic pump 20.

  In the first embodiment, the pump unit 10 having the outer cylinder 12 provided with the fiber layer in which a large number of highly elastic fibers 12k extending in the axial direction are embedded in the circumferential direction in the rubber member has been described. However, the present invention is not limited to this, and the present invention can also be applied to a pump unit having a fixed outer dimension, such as a pump unit having an outer cylinder made of metal or hard synthetic resin. In the above example, four restraints 15 are provided at equal angles in the circumferential direction of the inner cylinder 11, but may be three or five or more.

Embodiment 2. FIG.
In the first embodiment, the inner cylinder is the inner cylinder 11 in which only one inner protrusion such as the protrusions 16, 16 m, 16 n or the protrusion 16 p is provided between the restraining body 15 and the restraining body 15. Thus, the closing rate of the pump unit 10 is almost 100%. However, as shown in FIG. 9, a plurality of inner protrusions 46 k made of cylindrical protrusions are provided between the restraining bodies 45. If the pump unit provided with the inner cylinder 40 is used, a pump unit having a filtration function can be obtained. In addition, since the structure of the pump unit provided with the inner cylinder 40 of Embodiment 2 differs only in the structure of the inner cylinder from the pump unit 10 shown in FIG. 1, illustration is abbreviate | omitted. Moreover, the restraint body 45 is the same structure as the restraint body 15 of the pump unit 10 of FIG.

According to the inner cylinder 40 according to the second embodiment, as shown in FIG. 10 (a), when the inner cylinder 40 is inflated, among the inflating areas partitioned by the restraining body 45, the inner juts of the inflating areas adjacent to each other The portions 46k come into contact with each other to form a mesh-like gap between the expansion regions.
Therefore, when the fluid to be conveyed is, for example, a solid-liquid mixture, a solid larger than the size of the mesh-like gap cannot pass through the gap, and only the solid smaller than the size of the liquid and the mesh-like gap is pumped. Since it is discharged | emitted from a unit, the solid-liquid mixture which flowed into the pump unit can be filtered.
Further, as shown in FIGS. 10B and 10C, the size of the mesh can be adjusted by changing the size and number of the inner protrusions 46k, so that the size of the solid to be filtered can be selected. That is, the state of fluid conveyance can be freely controlled by changing the size and number of the inner protrusions 46k.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the embodiment. It is apparent from the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

10 pump unit, 11 inner cylinder, 12 outer cylinder,
12a, 12b Cylindrical rubber member, 12k high elastic fiber,
13A, 13B flange, 13H air inlet,
13h through hole, 13k recess, 13p engagement recess, 13q engagement protrusion,
14 inner fixing ring, 15 restraint body, 16 protrusion, 17 outer fixing ring,
18 air chambers, 19 flow paths (inside the unit).

Claims (4)

An outer cylinder,
An inner cylinder provided on the inner peripheral side of the outer cylinder;
A fixing member that fixes both axial ends of the inner cylinder and axial ends of the outer cylinder;
A pressurizing passage for supplying a pressurizing medium between the inner cylinder and the outer cylinder;
A pump unit that conveys fluid by expanding the inner cylinder with the pressurizing medium;
The inner cylinder is
A plurality of restraining bodies which are provided at intervals in the circumferential direction of the inner cylinder, extend along a direction parallel to the axial direction of the inner cylinder and restrain deformation of the inner cylinder;
A plurality of inner protrusions respectively provided at intermediate positions of the restraining bodies adjacent in the circumferential direction and protruding toward the inner peripheral side of the inner cylinder;
Equipped with a,
The pump unit characterized in that the plurality of inner projecting portions come into contact with each other when the inner cylinder is inflated to close the inside of the inner cylinder . An outer cylinder,
An inner cylinder provided on the inner peripheral side of the outer cylinder;
A fixing member that fixes both axial ends of the inner cylinder and axial ends of the outer cylinder;
A pressurizing passage for supplying a pressurizing medium between the inner cylinder and the outer cylinder;
A pump unit that conveys fluid by expanding the inner cylinder with the pressurizing medium;
The inner cylinder is
A plurality of restraining bodies which are provided at intervals in the circumferential direction of the inner cylinder, extend along a direction parallel to the axial direction of the inner cylinder and restrain deformation of the inner cylinder;
A plurality of inner protrusions that are provided between the restraining bodies adjacent in the circumferential direction and protrude toward the inner peripheral side of the inner cylinder;
With
The pump unit characterized in that the plurality of inner projecting portions are in contact with each other during expansion of the inner cylinder to form a mesh-like gap in the inner cylinder. Pump unit according to claim 1 or claim 2, wherein said restraining member is a carbon roving fibers.   3. The pump unit according to claim 1, wherein the outer cylinder includes a rubber member and a highly elastic fiber embedded in the rubber member and extending in a circumferential direction of the outer cylinder.

Images