JP2010077976A - Bellows pump and method of operating the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bellows pump which solves the problem that a conventional bellows pump requires an increase in the number of components since an operation object is mechanically connected to a bellows in order to compress and extend the bellows and that it requires large assembling man-hours since accurate assembling is required for assembling accuracy, which can reduce the number of components by compressing and extending the bellows by a simple method, and can be easily assembled. <P>SOLUTION: An air chamber composed of the bellows, a cylinder and a cylinder end plate is divided into two air chambers with a seal provided at the top plate of bellows. An air chamber entrance/exit joint connected to a drive source of a drive fluid is provided to each of the air chambers, and the air chamber entrance/exit joint can be opened in the atmospheric air. A narrow hole or a small groove used for connecting the air chambers to each other is formed at the top plate of the bellows in order to prevent the deformation/fracture of the bellows. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bellows pump and a method for operating the bellows pump.

  The bellows pump is a pump that operates by extending and compressing the bellows to suck and discharge the transport liquid. The bellows pump can easily discharge the transport liquid by compressing the bellows, but it is difficult to suck the liquid by extending the bellows.

  In Patent Document 1, a pump head that forms a suction passage, a discharge passage, and the like, left and right cylinder cases that are disposed so as to sandwich the pump head from both sides, and the cylinder cases are located on the outer peripheral side and at least approximately. There are a plurality of fastening means consisting of bolts or the like tightened at a total of four corners on the top, bottom, left, and right, and both sides of the both sides extending and contracting by the driving fluid disposed in each cylinder case and sucked and exhausted by the cylinder case. A bottom cylindrical bellows, a shaft member projecting from the free end face of each bellows, a connecting plate attached to each shaft member, and two rods connecting the connecting plates The two bellows are alternately extended and contracted through the intake and exhaust of the driving fluid and the rod, etc., thereby sucking the transfer fluid from the suction passage and Twin bellows pump which discharges is described.

  The conventional bellows pump is mechanically coupled so that it can be operated in a state in which the operating body is mechanically fastened and connected to the bellows, and the bellows that is mechanically coupled to the opposite side using the compression of one bellows is externally connected. Because it is mechanically extended from the shaft, it requires a lot of other parts such as shaft members, connecting plates, rods, bearing mechanisms, fixing members, etc., which are necessary for this mechanical connection. However, there are many factors that cause troubles such as a lot of restraints, difficulty in stabilizing the movement, a lot of man-hours, and wear of the bearings.

  As an alternative to the conventional bellows pump, two bellows are placed facing each other, and when one of the bellows is compressed with compressed air, a rod that directly pushes the opposite bellows to extend and opens a hole in the partition, A bellows pump that arranges two bellows to be connected by inserting the rod into a bellows into which a carrier fluid enters, so that the opposite bellows is directly expanded by the compressed bellows, and the bellows pump on the opposite side is extended. is there.

JP 2004-197689 A

  When a rod is inserted into the bellows, the pump carrier fluid enters the inside of the bellows, and therefore the resistance of the flow of the pump carrier fluid increases due to the influence of this rod, so the flow rate of the carrier fluid decreases and the loss increases. The pump of this method has a serious disadvantage as a pump in which the flow rate of the carrier fluid decreases, and is not suitable for a large pump in particular.

  In the conventional bellows drive system in which the operating body is fastened to the bellows, many parts are necessary and complicated. Moreover, it becomes a serious fault as a pump such as a decrease in the flow rate of the transport fluid.

  When the compressed fluid, which is the driving fluid, is supplied for the bellows pump operation, the bellows bellows, which is the bellows part that constitutes the bellows, is formed in a thin shape to make it easy to expand and contract. In addition, a phenomenon occurs in which the bellows bellows is crushed and deformed by the pressure of the compressed fluid toward the center of the bellows without being expanded or contracted.

  That is, since the bellows is contracted without being extended by the bellows, the carrier fluid cannot be sucked up and the bellows pump cannot be operated.

  This phenomenon is a serious defect that eliminates the function as a pump. This phenomenon is the cause of the abandonment of development by an engineer of a leading manufacturer who has repeated various experiments in the past.

  The present invention has been made in view of such points, and when a sufficient compressed fluid is supplied, the bellows bellows is deformed and broken by the compressed fluid, or the bellows bellows is contracted without being stretched when the bellows bellows should be stretched by the compressed fluid. It is an object of the present invention to solve the above-mentioned serious defect of the conventional bellows pump by avoiding the occurrence of the phenomenon and enabling normal operation.

The present invention includes at least two bellows formed by attaching a bellows portion to a bellows top plate portion, and includes two cylinders in which each bellows is slidably disposed, and the two cylinders and 2 A pump main body to which two bellows portions are fixed, and compressed fluid working chambers are formed in the cylinder, between the cylinder and the bellows portion, and between the bellows top plate portion and the cylinder, respectively. The compressed fluid is introduced into the respective compressed fluid working chambers to compress and expand the bellows part so that the transport liquid flows alternately into the bellows and the transport liquid is alternately discharged from the bellows. In bellows pump,
A compressed fluid discharge passage is provided that communicates with a compressed fluid working chamber formed between the cylinder and the bellows portion to relieve the working pressure of the compressed fluid introduced into the compressed fluid working chamber;
The compressed fluid discharge path communicates with a compressed fluid working chamber formed between the cylinder and the bellows part, and is introduced into the compressed fluid working chamber formed between the cylinder and the bellows. When fluid is introduced into the compressed fluid working chamber formed between the bellows top plate portion and the cylinder, a part of the introduced compressed fluid flows out to the atmosphere to generate an inflow loss, and compression The bellows pump is characterized by being formed by pores or small grooves communicating with the atmosphere for relaxing the working pressure of the fluid.

  In the present invention, it is preferable that the pores are formed by reducing the working pressure of the compressed fluid when the compressed fluid is introduced into a compressed fluid working chamber formed between the cylinder and the bellows. The bellows pump is characterized in that it is formed in a size that does not crush the bellows forming the bellows.

The present invention includes at least two bellows formed by attaching a bellows portion to a bellows top plate portion, and includes two cylinders in which each bellows is slidably disposed, and the two cylinders and 2 A pump main body to which two bellows portions are fixed, and compressed fluid working chambers are formed in the cylinder, between the cylinder and the bellows portion, and between the bellows top plate portion and the cylinder, respectively. The compressed fluid is introduced into the respective compressed fluid working chambers to compress and expand the bellows part, so that the transport liquid flows alternately into each bellows, and the transport liquid is alternately discharged from each bellows. , Communicating with a compressed fluid working chamber formed between the cylinder and the bellows portion, and reducing the working pressure of the compressed fluid introduced into the compressed fluid working chamber. Compressed fluid discharge passage is provided with a sum, method of operating a bellows pump which is formed the compressed fluid discharge passage by pores or small grooves,
The pores or small grooves communicating with the atmosphere are communicated with a compressed fluid working chamber formed between the cylinder and the bellows portion, and are formed in the compressed fluid working chamber formed between the cylinder and the bellows. When the introduced compressed fluid is introduced into the compressed fluid working chamber formed between the bellows top plate portion and the cylinder, a part of the introduced compressed fluid is caused to flow out to the atmosphere to reduce inflow loss. A method for operating a bellows pump is provided, wherein the operating pressure of the compressed fluid is reduced.

  In the present invention, it is preferable that when the compressed fluid is introduced into a compressed fluid working chamber formed between the cylinder and the bellows, the pores relieve the working pressure of the compressed fluid and compress the compressed fluid. Provided is a method for operating a bellows pump, wherein the fluid does not crush the bellows forming the bellows.

  The present invention communicates with the compressed fluid working chamber formed between the cylinder and the bellows portion which is the bellows bellows as described above, and compresses the working pressure of the compressed fluid introduced into the compressed fluid working chamber. Since the fluid discharge path is provided, and further, the compressed fluid discharge path is formed by a narrow hole or a small groove communicating with the external atmosphere, so that the compressed fluid is supplied to the compressed fluid working chamber, or When the bellows bellows is to be stretched by the compressed fluid, it is possible to avoid the phenomenon that the bellows bellows contracts without being stretched, and thus the normal operation of the bellows pump can be continued.

  In addition, the present invention employs a structure in which pores or small grooves communicating with the atmosphere are formed in the bellows top plate, cylinder, or other part as described above, so that it is necessary for mechanical coupling like a conventional bellows pump. It is possible to solve a serious defect of the conventional bellows pump with a very simple structure without using any member, and the manufacturing cost of the apparatus itself can be reduced due to this simple structure.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 is an overall perspective view of a bellows pump of an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a right side view of FIG. 1, FIG. 4 is a left side view of FIG. 1 is a longitudinal sectional view of FIG.

  1 to 4, the bellows pump 100 of this embodiment is in close contact with the left and right cylinders 1a and 1b (1 in general terms), a pump body 19 provided integrally between them, and the outside of each cylinder. Cylinder end plates 4 and 5 are provided, and O-rings 4a and 5a are provided between the cylinder end plates 4 and 5 and the cylinders 1a and 1b. Fixing bolts 34a, 34b, 34c, 34d (34 in the case of generic name) are provided through the four corners, and are fastened by nuts 35a, 35b, 35c, 35d (35 in the case of a generic name).

  At the uppermost part of the cylinder 1a, there is provided a joint (hereinafter referred to as an air chamber inlet joint. The same shall apply to other similar components) 8 serving as an air chamber inlet / outlet. An air chamber inlet / outlet joint 9 is provided at the top of 1b, an air chamber inlet / outlet joint 6 is provided at the upper side of the cylinder end plate 4, and an air chamber inlet / outlet joint 7 is provided at the upper side of the cylinder end plate 5a. Is provided.

A valve 10 is installed at the center of the side of the cylinder end plate 4, and another valve 11 is installed at the center of the side of the cylinder end plate 5. The pump body 19 is formed in the center cylindrical lower shapes of cylinder height, the discharge port 17 of the transport liquid in its uppermost part, and inlet 1 8 of the transfer liquid to the front side lateral part are provided. The suction port 18 and the discharge port 17 communicate with each other as described later.

  In FIG. 4, a bellows top plate portion 2b is disposed in a cylinder 1a, and a bellows portion 2c that is a bellows bellows integrated with the bellows top plate portion 20 is disposed in the cylinder 1a. The bellows top plate portion 2b is formed in a plate shape, and an O-ring groove 2a is formed on an end surface thereof, and an O-ring 2e is disposed in the O-ring groove 2a to ensure airtightness.

  The bellows portion 2c has a bellows bellows configuration as described above, and can be extended and contracted. One end side is fixed to the bellows top plate portion 2b, and the other end side is fixed to the end surface of the pump body 19. With such a configuration, that is, the bellows portion 2c is attached to the bellows top plate portion 2b, and one bellows 2 is formed.

  In the formed bellows 2, the end surface of the bellows top plate portion 2b slides on the inner surface of the cylinder 1b, and at that time, airtightness is maintained by the combination of the O-ring groove 2a and the O-ring 2e.

  In this way, the bellows top plate portion 2b that can maintain airtightness divides the internal space of the cylinder 1a into left and right sides and forms chambers on both sides. The bellows part 2c divides the chamber divided on the left side into chambers inside and outside the bellows. Therefore, the chamber divided by the right side and formed by the bellows top plate portion 2b and the cylinder 1a is referred to as a bellows top plate side air chamber 12. This bellows top plate side air chamber 12 acts as one compressed fluid working chamber.

The bellows portion 2c and the cylinder 1 a, a chamber formed called bellows (bellows) Gawakishitsu 14. The bellows side air chamber 14 functions as another compressed fluid working chamber. Bellows 14 inside the bellows portion 2c, the chamber formed by the bellows top plate 2b and the pump body 19 becomes delivery flow member transport chamber 14A.

  An air chamber inlet / outlet joint 6 provided in the cylinder end plate 4 communicates with the bellows top plate side air chamber 12, and compressed fluid (for example, compressed air) as a drive source is introduced through the air chamber inlet / outlet joint 6. Discharged. The introduced compressed fluid acts on the side surface of the bellows top plate portion 2b and presses the bellows top plate portion 2b to slide in the cylinder 1a.

An air chamber inlet / outlet joint 8 provided in the cylindrical portion of the cylinder 1a communicates with the bellows side air chamber 14, and compressed fluid as a drive source is introduced and discharged through the air chamber inlet / outlet joint 8. The introduced compressed fluid acts on the bellows part 2c, expands the bellows 2, and moves the inside of the cylinder 1a to the right.

A compressed fluid as a driving source is introduced into one of the bellows top plate side air chamber 12 and the bellows side air chamber 14 and discharged, whereby the bellows 1 expands and contracts in the cylinder 1 . Along with this, the volume of the transfer fluid transfer chamber 14A increases or decreases. At both ends of the bellows top plate portion 2b, there are provided pores 20 and 21 that allow the bellows top plate side air chamber 12 and the bellows side air chamber 14 to communicate with each other. The function of the pores 20 and 21 will be described later.
The bellows 2 is configured as described above.
The bellows 3 on the other side is configured in the same manner as the bellows 2.

  An air chamber inlet / outlet joint 7 provided in the cylinder end plate 5 communicates with the bellows top plate side air chamber 13, and a compressed fluid (for example, compressed air) as a drive source is introduced through the air chamber inlet / outlet joint 7. Discharged. The introduced compressed fluid acts on the side surface of the bellows top plate portion 3b and presses the bellows top plate portion 3b to slide in the cylinder 1b.

  An air chamber inlet / outlet joint 9 provided in the cylindrical portion of the cylinder 1b communicates with the bellows-side air chamber 15, and compressed fluid as a drive source is introduced and discharged through the air chamber inlet / outlet joint 8. The introduced compressed fluid acts on the bellows portion 3c and expands the bellows 3 to move leftward in the cylinder 1b.

  Compressed fluid as a drive source is introduced into one of the bellows top plate side air chamber 13 and the bellows side air chamber 15 and discharged, whereby the bellows 3 expands and contracts in the cylinder 1b. Along with this, the volume of the transfer flow transfer chamber 15A increases or decreases.

At both ends of the bellows top plate portion 3b, there are provided pores 22 and 23 that allow the bellows top plate side air chamber 13 and the bellows side air chamber 15 to communicate with each other. The function of the pores 22 and 23 will be described later.
The bellows 3 is configured as described above.

  6 shows the right side of the pump body 19, FIG. 7 shows the cross section of FIG. 5, FIG. 7 (B) shows the BB cross section of FIG. 6, and FIG. FIG. 8 shows a cross section taken along the line AA of FIG.

  As shown in FIGS. 4 and 7, communication holes 26 </ b> A and 30 </ b> A that communicate from the suction port 18 to the transport flow transfer chambers 14 </ b> A and 15 </ b> A through suction side outlets 29 and 33, respectively, are provided inside the pump body 19. The suction side check valve seat 28 is disposed in the communication hole 26A (FIG. 7B), and the communication hole 30A suction side check valve 30 is disposed (FIG. 7C). As shown in FIG. 7B, the check valve installation member 19A is fitted into the communication hole 26A. The check valve installation member 19A is guided by the intake valve body guide 27 and the intake valve body guide 27. A sliding suction check valve 26 and a suction check valve seat 28 are provided.

  The suction side check valve 26 is sealed by being brought into pressure contact with the suction side check valve seat 28, and the inflow of the transport liquid from the suction port 18 to the bellows 2 side is prevented. That is, the flow from the suction side outlet 29 to the transfer fluid transfer chamber 14A of the bellows 2 is stopped and discharged from the discharge check valve 16 (to be described later) toward the discharge port 17 by the transfer liquid in the bellows 2 and the action of the bellows 2. Is made. When the pressure in the transfer fluid transfer chamber 14A decreases and the seal is released, the suction side check valve 26 is guided by the suction valve body guide 27 and slides upward, so that the transfer liquid is transferred from the suction side outlet 29. It is allowed to flow into the fluid transfer chamber 14A.

As shown in FIG. 7C, the check valve installation member 19 B is inserted into the communication hole 30 A. The check valve installation member 19 B is connected to the intake valve body guide 31 and the intake valve body guide 31. A suction-side check valve 30 and a suction-side check valve seat 32 that slide while being guided are provided.

The suction-side check valve 30 is sealed by being brought into pressure contact with the suction-side check valve seat 32, and the flow of the transport liquid from the suction port 18 to the bellows 3 side is prevented. That is, the flow of the bellows 3 from the suction side outlet 33 to the transport liquid transport chamber 15A is stopped, and the transport liquid in the bellows 3 is discharged from the discharge side check valve 16 ( described later) toward the discharge port 17 by the action of the bellows 3. Made. When the pressure in the transport liquid transport chamber 15A decreases and the seal is released, the suction side check valve 30 is guided by the suction valve body guide 31 and slides upward, so that the transport liquid is transported from the suction side outlet 33. It is allowed to flow into the liquid transfer chamber 15A.

Such an operation is alternately repeated in synchronism with the alternately extending and contracting actions of the bellows 2 and 3, and the transport liquid in one of the transport liquid transport chambers 14A and 15A is discharged to the discharge port without interruption. Pumped through valve 16. The discharge side check valve 16 is configured as follows.
The bellows 2 is configured as described above.

  As shown in FIGS. 4 and 8, a communication hole 16A communicating with the liquid conveyance chambers 14A and 15A is provided in the upper part of the pump body 19, and the discharge side check valve 16 is disposed in the communication hole 16A. The discharge side of the discharge side check valve 16 communicates with the discharge port 17. The discharge-side check valve 16 alternately leads the transport liquid in the transport liquid transport chambers 14A and 15A to the discharge port 17.

FIG. 9 shows a bellows pump drive fluid switching operation circuit. In FIG. 9, the bellows pump driving fluid switching operation circuit includes a main valve 44 connected to a driving fluid supply path 45 connected to a driving source, and the main valve 44 includes a switching circuit therein, and is driven by this switching. The fluid supply path 45 is continued to either the air chamber inlet / outlet joint 6 and the air chamber inlet / outlet joint 9 or the air chamber inlet / outlet joint 7 and the air chamber inlet / outlet joint 8. In the illustrated example, the driving fluid supply path 45 is connected to the air chamber access joints 7 and 8 . In this example, a compressed liquid is used as the driving fluid. In the illustrated example, the air chamber entrance / exit joints 7 and 8 are open to the atmosphere. Therefore, in this case, the bellows top plate side air chamber 13 is opened to the atmosphere via the air chamber inlet / outlet joint 7.

  The circuit switching of the main valve 44 is performed by operation signals from the valve 10 and the valve 11.

  In FIG. 5, step holes 4 b and 5 b are provided near the center of the cylinder end plates 4 and 5, and pins 38 and 39 are attached together with springs 40 and 41. The valves 10 and 11 are screwed to the plates corresponding to the pins 38 and 39, and these plates are fixedly arranged on the cylinder end plates 4 and 5 with screws. These pins 38 and 39 transmit the expansion and contraction movements of the bellows 2 and 3 to the main valve 44 as signals for the switching operation of the main bubbles 44 of the bubbles 10 and 11. This signal is used to perform a pushing operation necessary for the switching operation of the main valve 44. That is, when the bellows 2 and 3 are extended, the pins 38 and 39 are pushed up by the stainless steel plates 42 and 43 incorporated in the bellows 2 and 3, and the air is switched by pushing the switching portion of the valves 10 and 11. The switched air is used as a signal to switch the main valve 44.

When compressed gas is simultaneously put into the air chamber inlet / outlet joints 6 and 9 that function as a pump, the bellows 2 is contracted by the compressed air that has entered the air chamber 12, and the check valve on the discharge side is moved by the contraction of the bellows 2, The carrier fluid is discharged through the discharge port 17. At that time, since the compressed air enters the bellows-side air chamber 15 at the same time, the bellows 3 expands.
Next, the suction side check valve 30 releases the pressure contact state with the suction check valve seat 32 and floats to draw the carrier fluid from the suction port 18 into the bellows 3. At this time, the discharge side check valve Since 16 is closed, only the transport fluid from the bellows 2 flows to the discharge port 17. The pin 39 is pushed by the plate 43 joined to the bellows top plate portion 3b by the extension of the bellows 3, and the valve 11 is switched.

Next, the compressed fluid obtained by compressing and expanding the bellows 2 and the bellows 3 is released when the main valve 44 is switched, and the compressed air is released to the atmospheric pressure from the air chamber inlet / outlet joints 6 and 9, respectively. 9 and the valve 11 is returned to its original position. At the same time, the main valve 44 shown in FIG. 9 is switched, so that compressed gas is supplied to the air inlet / outlet joints 7 and 8 and the bellows 3 is contracted to check. The valve 16 is opened, the carrier fluid is discharged from the discharge port 17, and the suction side check valve 30 of the suction port 18 is closed.
At the same time, the bellows 2 expands. As a result, since the suction side check valve 26 inside the bellows 2 is lifted and the pressure seal state with the suction side check valve seat 28 is lost, the carrier fluid is transferred from the suction port 18 into the bellows 2. It flows in vigorously.

  This time, the pin 38 is pushed by the plate 42 joined to the bellows top plate portion 2b, and the valve 10 is switched. Then, the main valve 44 is switched again, and the compressed gas is supplied to the air chamber inlet / outlet joints 6 and 9. In this way, the compression and expansion operations of the bellows are repeated, and the carrier fluid is pumped.

When compressed gas is supplied to the bellows side air chamber 14 or 15, the bellows portions 2c and 3c, which are bellows bellows, are thin-walled and can be easily expanded and contracted. When the bellows enters, the bellows bellows is crushed and deformed and destroyed by the pressure of the compressed air toward the center of the bellows in a state in which the bellows bellows is not stretched by the compressed air pressure.
That is, since the bellows contracts without being stretched, a phenomenon occurs in which the carrier fluid cannot be sucked up and does not function as a pump.

  This defect is caused by the pores 20 and 21 communicating the bellows top plate side air chamber 12 and the bellows side air chamber 14 or / and the pore 22 communicating the bellows top plate side air chamber 13 and the bellows side air chamber 15. , 23 is provided to prevent the bellows bellows from being crushed and deformed by causing some loss of the compressed fluid. That is, in the communicating pores 20, 21, 22, and 23, the bellows top plate side air chambers 12 and 13 are opened to the atmospheric pressure, so that a loss of compressed fluid occurs. Since the loss of the compressed fluid relaxes the pressure of the introduced compressed fluid, it has a function not to cause the compression deformation that crushes the bellows.

Here, the pores 20 and 21 that communicate the bellows top plate side air chamber 12 and the bellows side air chamber 14, and / or the pores 22 that communicate the bellows top plate side air chamber 13 and the bellows side air chamber 15, 23 was provided to avoid deformation of the bellows part. As another method, the same effect can be obtained by forming similar pores in the cylindrical portions of the cylinders 1a and 1b having the bellows-side bellows-side air chambers 14 and 15 to communicate with the atmosphere. Alternatively, the pump body 19 may be provided with pores so as to communicate with the atmosphere.
Alternatively, as another method, the seal may be sealed loosely so that compressed air leaks, instead of completely sealing.

  That is, the compressed fluid introduced into the compressed fluid working chamber is communicated with the compressed fluid working chamber which is the bellows (bellows) side air chambers 14 and 15 formed between the cylinders 1a and 1b and the bellows portions 2c and 3c. The deficiencies described above are overcome by providing a compressed fluid discharge path that relieves the working pressure of the fluid.

  The compressed fluid discharge path is formed between the compressed fluid working chambers 14 and 15 formed between the cylinders 1a and 1b and the bellows portions 2c and 3c, and the bellows top plate portions 2b and 3b and the cylinders 1a and 1b. The compressed fluid working chambers 12 and 13 can be formed by pores or small grooves communicating with each other. The compressed fluid discharge path can be formed by a communication means for communicating the compressed fluid working chambers 14 and 15 formed between the cylinders 1a and 1b and the bellows portions 2c and 3c to the outside atmosphere.

  The communication means can be formed by forming pores in the cylinders 1a, 1b or the pump body 19 for communicating with the external atmosphere.

  As described above, the compressed gas sufficiently supplied for the operation of the bellows expands the bellows 2 or the bellows 3 without deforming and destroying the bellows 2c or the bellows 3c due to the loss at the beginning of the addition. In other words, by making the loss, the deformation of the bellows is selected by selecting the size of the narrow hole and the size of the communicating area so that the force of the compressed gas is applied to the bellows which is the bellows part of the bellows but does not become the force until it is crushed The bellows can be extended while preventing breakage. If the pores are too large, it will be difficult to operate the bellows.

With regard to the size of the communication pores, it is usually preferable to provide several in consideration of the balance, but one small hole may be used if it is a small bellows. Moreover, although it was set as the pore in the Example, the same effect can be given even with a small groove. Or do not seal completely. A similar operation can be achieved by providing a slight gap in the seal. Since the open area varies depending on the size of the pump and the pressure of the compressed air, it is determined by simulation or experiment.
By making this communication, the expansion and contraction of the bellows becomes free. Unlike conventional bellows pumps, the number of parts that make the pump function is reduced, making it possible to operate with almost half of the parts. It becomes like this.

  In addition, for the part that requires the accuracy required to stabilize the operation of the pump, the conventional pump is a multi-constraint design, so the structure was complicated and difficult to achieve performance, but the bellows pump of this embodiment is Since the accuracy is simple, pump assembly is easy, and important problems of the pump such as the life and reliability of the pump can be easily achieved, which is very advantageous as compared with the conventional pump.

  As described above, in this embodiment, at least two bellows 2 and 3 formed by attaching bellows 2c and 3c having a bellows configuration to bellows top plates 2b and 3b are provided. The cylinders 1a and 1b are slidably disposed in the cylinders 1a and 1b, respectively, between the cylinders 1a and 1b and the bellows portions 2c and 3c, and the bellows top plates 2b and 3b. And the cylinders 1a and 1b are formed with compressed fluid working chambers (bellows (bellows) side air chambers 14 and 15 and bellows top plate side air chambers 12 and 13), respectively. The bellows 2c, 3c are compressed and expanded by being introduced, and the carrier liquid is alternately introduced into each bellows, and the carrier liquid is alternately discharged from each bellows. Pump 100 is used.

In the bellows pump configured as described above, when the compressed fluid is introduced into the compressed fluid working chamber formed between the cylinders 1a and 1b and the bellows portions 2c and 3c, the compression of the portion from the compressed fluid discharge passage is performed. A method of operating the bellows pump is formed in which the fluid is discharged to relieve the working pressure of the compressed fluid introduced into the compressed fluid working chamber.
Further, in this operation method, a compression fluid working chamber formed between the cylinders 1a and 1b and the bellows portions 2c and 3c is formed between the bellows top plate portions 2b and 3b and the cylinders 1a and 1b. An operation method is formed in which a part of the compressed fluid is caused to flow into the compressed fluid working chamber.

Further, in the above-described operation method, an operation method in which a part of the compressed fluid is caused to flow directly from the compressed fluid working chamber formed between the cylinders 1a and 1b and the bellows portions 2c and 3c to the outside atmosphere. Is formed.
Further, in the above-described operation method, an operation method is formed in which a part of the compressed fluid is directly discharged into the atmosphere from, for example, the pores 20, 21, 22, and 23 provided in the cylinders 1a and 1b or the pump body 19. Is done.

1 is an overall perspective view of a bellows pump according to an embodiment of the present invention. The front view of the bellows pump of FIG. The right side view of the bellows pump of FIG. The left side view of the bellows pump of FIG. The bellows pump sectional drawing of FIG. The pump main body right view of FIG. BB sectional drawing (FIG. 7B) of FIG. 6, CC sectional view (FIG. 7C). AA line sectional view of Drawing 6. The gas circuit diagram for the bellows pump drive used for a present Example.

1a, 1b: Cylinder 2: Bellows 3: Bellows 2a, 3a: O-ring groove 2b, 3b: Bellows top plate portion 2c, 3c: Bellows portion (bellows portion)
4: Cylinder end plate 5: Cylinder end plate 4b, 5b: Step hole 6: Air chamber entrance / exit joint 7: Air chamber entrance / exit joint 8: Air chamber entrance / exit joint 9: Air chamber entrance / exit joint 10: Valve 11: Valve 12: Bellows top Plate side air chamber 13: Bellows top plate side air chamber 14: Bellows (bellows) side air chamber 14A: Transfer fluid transfer chamber (bellows 2 side)
15: Bellows (bellows) side air chamber 15A: Transfer liquid transfer chamber (bellows 3 side)
16: Discharge side check valve 16A: Communication hole 17: Discharge port 18: Suction port 19: Pump body 19A: Check valve installation member 20, 21, 22, 23: Fine hole 26: Suction side check valve (bellows 2) side)
26A: Communication hole 27: Suction valve element guide (bellows 2 side)
28: Check valve seat on suction side (Bellows 2 side)
29: Suction side outlet (Bellows 2 side)
30: Suction side check valve (Bellows 3 side)
31: Suction valve body guide (bellows 3 side)
32: Suction side check valve seat (Bellows 3 side)
33: Inlet side outlet (bellows 3 side)
42: plate 43: plate 44: main valve 45: drive fluid supply path

Claims (4)

The bellows top plate part is provided with at least two bellows formed by attaching the bellows part, and each bellows is provided with two cylinders slidably disposed, the two cylinders and the two bellows parts are provided. A pump main body to be fixed, and a compression fluid working chamber is formed in the cylinder between the cylinder and the bellows part, and between the bellows top plate part and the cylinder. In the bellows pump that compresses and expands the bellows portion by introducing a compressed fluid into the fluid working chamber, alternately flows the transport liquid into each bellows, and alternately discharges the transport liquid from each bellows.
A compressed fluid discharge passage is provided that communicates with a compressed fluid working chamber formed between the cylinder and the bellows portion to relieve the working pressure of the compressed fluid introduced into the compressed fluid working chamber;
The compressed fluid discharge path communicates with a compressed fluid working chamber formed between the cylinder and the bellows part, and is introduced into the compressed fluid working chamber formed between the cylinder and the bellows. When fluid is introduced into the compressed fluid working chamber formed between the bellows top plate portion and the cylinder, a part of the introduced compressed fluid flows out to the atmosphere to generate an inflow loss, and compression A bellows pump characterized in that it is formed by pores or small grooves communicating with the atmosphere that relieve the working pressure of fluid.   2. The pore according to claim 1, wherein when the compressed fluid is introduced into a compressed fluid working chamber formed between the cylinder and the bellows, the compressed fluid is relieved by reducing the working pressure of the compressed fluid. A bellows pump characterized by being formed in a size that does not crush the bellows forming the bellows. The bellows top plate part is provided with at least two bellows formed by attaching the bellows part, and each bellows is provided with two cylinders slidably disposed, the two cylinders and the two bellows parts are provided. A pump main body to be fixed, and a compression fluid working chamber is formed in the cylinder between the cylinder and the bellows part, and between the bellows top plate part and the cylinder. When the compressed fluid is introduced into the fluid working chamber, the bellows portion is compressed and expanded, and the carrier liquid is alternately introduced into each bellows, and the carrier liquid is alternately discharged from each bellows, Pressure that reduces the working pressure of the compressed fluid introduced into the compressed fluid working chamber by communicating with the compressed fluid working chamber formed between the bellows portion Fluid discharge passage is provided method of operating a bellows pump which is formed the compressed fluid discharge passage by pores or small grooves,
The pores or small grooves communicating with the atmosphere are communicated with a compressed fluid working chamber formed between the cylinder and the bellows portion, and are formed in the compressed fluid working chamber formed between the cylinder and the bellows. When the introduced compressed fluid is introduced into the compressed fluid working chamber formed between the bellows top plate portion and the cylinder, a part of the introduced compressed fluid is caused to flow out to the atmosphere to reduce inflow loss. A method for operating a bellows pump, characterized in that the operating pressure of the compressed fluid is reduced.   4. The compressed pore according to claim 3, wherein the pore relaxes the working pressure of the compressed fluid when the compressed fluid is introduced into a compressed fluid working chamber formed between the cylinder and the bellows. Does not crush the bellows forming the bellows.

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