JP4413741B2 - Diaphragm pump - Google Patents

Description

  The present invention relates to a diaphragm pump having a diaphragm in which two diaphragm sheets are brought into close contact with each other via a fluid, such as a diaphragm pump with a breakage detector.

  FIG. 4 shows a schematic configuration of the diaphragm pump. In the diaphragm pump 10 of FIG. 4, a diaphragm chamber 14 is provided in the diaphragm head 12, and this diaphragm chamber 14 is divided into two chambers of a fluid pressure chamber 16 and a pump chamber 18 by a diaphragm 20. The pump chamber 18 communicates with a suction pipe 22 and a discharge pipe 24 for handling liquid. The fluid pressure chamber 16 is connected to a through hole provided in the diaphragm head 12 for inserting the plunger 26, and the plunger 26 is inserted into the through hole from the outside of the diaphragm head. Here, the plunger 26 is reciprocated by a drive mechanism (not shown), and the tip of the plunger 26 reciprocates toward the fluid pressure chamber 16 as the drive mechanism reciprocates. ing.

  Further, the fluid pressure chamber 16 is filled with the working fluid, and when the plunger 26 is reciprocated as described above, the diaphragm 20 is also reciprocated accordingly, and the diaphragm 20 is moved to the fluid pressure chamber side, that is, the pump chamber side. By repeating the concave curve and the convex curve, the volume of the pump chamber 18 is changed. Further, the suction pipe 22 and the discharge pipe 24 are provided with check valves 22a and 24a, respectively, and the liquid to be handled is one-way from the suction pipe 22 to the discharge pipe 24 by the action of the check valves 22a and 24a. It can only flow into. The handling liquid flows from the suction pipe 22 toward the discharge pipe 24 in accordance with the volume change of the pump chamber 18 due to the reciprocation of the plunger 26.

  Further, in the diaphragm pump 10 of FIG. 4, a reservoir chamber 28 that stores a replenishing working fluid is provided adjacent to the back side (the rear end side of the plunger 26) of the diaphragm head 12. Between the reservoir chamber 28 and the fluid pressure chamber 16, a supply flow path 30 for supplying working fluid from the reservoir chamber 28 into the fluid pressure chamber 16, and excess working fluid in the fluid pressure chamber 16 are stored in the reservoir. The chamber 28 is provided with a release flow path 32, and the supply flow path 30 is provided with a supply valve 30 a that allows only the flow from the reservoir chamber 28 toward the fluid pressure chamber 16. A relief valve 32a that allows only a flow from the fluid pressure chamber 16 toward the reservoir chamber 28 is provided.

  Further, a plunger seal 34 is provided on the inner surface of the through hole of the diaphragm head 12 so that the working fluid does not flow between the fluid pressure chamber 16 and the reservoir chamber 28 through the through hole.

  When the pressure in the fluid pressure chamber 16 drops below a certain level, the replenishment valve 30 a opens, and the working fluid flows from the reservoir chamber 28 into the fluid pressure chamber 16 via the replenishment flow path 30. When the pressure reaches a certain level (the level in which the pressure in the fluid pressure chamber 16 is balanced with the pressure of the working fluid in the reservoir chamber 28), the refill valve 30a is closed. On the other hand, when the pressure in the fluid pressure chamber 16 rises above a certain level, the relief valve 32 a opens, and the working fluid flows out from the fluid pressure chamber 16 to the reservoir chamber 28 via the release flow path 32, When the pressure reaches a certain level, the relief valve 32a is closed. Thus, the pressure in the fluid pressure chamber 16 is maintained at a constant level.

  Further, in the diaphragm pump 10 of FIG. 4, in order to detect the breakage of the diaphragm 20, two diaphragm sheets 20 a and 20 b are brought into close contact with each other via a pressure transmission medium (not shown) as will be described later. It is formed. For example, as shown in FIG. 4, the diaphragm 20 is formed by bonding the peripheral edges of two diaphragm sheets 20a and 20b with a thin peripheral ring 36 interposed therebetween, and the peripheral ring 36 is interposed between the diaphragm sheets 20a and 20b. A pressure transmission medium is injected through the provided through hole.

  In addition, a pressure transmission medium (for example, oil) is injected between the two diaphragm sheets 20a and 20b into the diaphragm (more specifically, the through hole of the peripheral ring 36 between the diaphragm sheets 20a and 20b). An injection path 38 is connected. Further, the peripheral ring 36 is provided with another through hole different from the through hole for injection, and a discharge passage 40 for discharging the excessively injected pressure transmission medium is connected to the other through hole. Has been. The injection path 38 connected to the lower part of the diaphragm 20 has an inlet at the end and is provided with a valve 38a. The discharged pressure transmission medium is supplied to the discharge path 40 connected to the upper part of the diaphragm 20. A check valve 40a is provided so as not to flow back between the diaphragm sheets 20a and 20b, and pressure detecting means (pressure gauge, pressure sensor, etc.) for detecting the pressure of the pressure transmission medium discharged through the check valve 40a. 42 and a drain valve 40b for discharging excess pressure transmission medium to the outside. The injection path 38 and the discharge path 40 perform injection of the pressure transmission medium between the diaphragm sheets 20a and 20b and bonding of the diaphragm sheets 20a and 20b.

  Specifically, the pressure transmission medium is injected between the two diaphragm sheets 20a and 20b via the injection path 38, the valve 38a of the injection path 38 is closed, and the drain valve 40b of the discharge path 40 is opened. By operating the pump 10, the excessive pressure transmission medium between the diaphragm sheets 20a and 20b is discharged to the outside through the check valve 40a and the drain valve 40b together with the mixed air by the operating pressure of the pump 10. The diaphragm sheets 20a and 20b are bonded together like a single diaphragm. When the drain valve 40b is closed in this state, the diaphragm 20 is formed in which the two diaphragm sheets 20a and 20b are in close contact with each other via the pressure transmission medium. The diaphragm 20 in which the two diaphragm sheets 20a and 20b are thus bonded functions as a single diaphragm during normal operation of the pump.

  When one or both of the two diaphragm sheets 20a and 20b are damaged, an operating pressure is applied between the diaphragm sheets 20a and 20b, and the pressure is transmitted to the pressure transmission medium by the pressure detecting means 42. Therefore, when the pressure detecting means 42 shows an abnormal value, it can be determined that the diaphragm sheets 20a and 20b are damaged. At that time, the pump 10 is stopped and repaired. Note that the diaphragm pump capable of detecting the breakage of the diaphragm as described above is described in, for example, the following prior art documents.

JP 2001-289175 A JP-A-11-132149

  In the diaphragm pump 10 having the diaphragm 20 having the above-described configuration, when a pressure transmission medium is injected from the injection path 38 between the diaphragm sheets 20a and 20b, the pressure transmission medium is inserted between the injection port and the diaphragm sheets 20a and 20b using a syringe or the like. The injection work was done by a manual method of pushing in. However, depending on the degree of the gap between the diaphragm sheets 20a and 20b, a pushing force of about 0.1 to 0.2 MPa may be required, so that it is difficult to inject manually using a syringe or the like. Further, when the injection operation is performed by such a method, the pressure transmission medium scatters from the tip portion of a syringe or the like pressed against the injection port. As described above, conventionally, it has been difficult to efficiently inject the pressure transmission medium between the diaphragm sheets 20a and 20b.

  An object of the present invention is to provide a diaphragm pump capable of efficiently injecting a pressure transmission medium without manual operation when injecting the pressure transmission medium between diaphragm sheets.

  The diaphragm pump according to the present invention includes a fluid pressure chamber that contains a working fluid, a pump chamber into which a handling liquid flows in and out, and the fluid pressure chamber that is formed by bringing two diaphragm sheets into close contact with each other through the fluid. A diaphragm that partitions the pump chamber; a plunger that reciprocates the diaphragm via a working fluid in the fluid pressure chamber; and an injection path that allows fluid to be injected between the two diaphragm sheets. A diaphragm pump that causes the handling liquid to flow in and out of the pump chamber by reciprocating movement of the diaphragm, wherein the injection path includes the fluid pressure chamber and a space formed between the two diaphragm sheets. The two diaphragms are provided so as to communicate with each other, and the reciprocating motion of the plunger causes the working fluid in the fluid pressure chamber to flow through the injection path. It is obtained by enabling injected between the sheets.

  Further, in the diaphragm pump having the above-described configuration, the injection path blocks the flow path from the check valve for flowing the working fluid only in one direction from the fluid pressure chamber to the space between the two diaphragm sheets. And a flow path blocking means.

  According to the present invention, when a fluid of the same type as the working fluid is also used as the pressure transmission medium, such as injecting oil as a pressure transmission medium between the diaphragm sheets in the hydraulic diaphragm pump, the working fluid is activated by the action of the pump. Since a part of the working fluid in the fluid pressure chamber is injected between the diaphragm sheets using the pressure applied to the fluid pressure chamber, the labor of the conventional manual work can be eliminated, and the work of injecting the pressure transmission medium can be performed efficiently.

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

  FIG. 1 shows a schematic configuration of a diaphragm pump according to an embodiment of the present invention. The diaphragm pump 1 has the same configuration as that of the conventional diaphragm pump 10 of FIG. 4 except for an injection path 50 for injecting a pressure transmission medium between the diaphragm sheets 20a and 20b. And the operation | movement at the time of the normal driving | operation of the pump 1 which concerns on this embodiment, and the failure | damage detection operation at the time of a diaphragm failure are the same operations as the diaphragm pump 10 of the conventional FIG.

  In the diaphragm pump 1 according to the present embodiment, the diaphragm head 12 is formed with an injection path 50 that communicates the fluid pressure chamber 16 and the space formed between the diaphragm sheets 20a and 20b. Further, in the middle of the injection path 50, the check path 51 for allowing the working fluid to flow only in one direction from the fluid pressure chamber 16 between the diaphragm sheets 20a and 20b and the injection path 50 are shut off. A channel blocking means 52 is provided.

  The channel blocking means 52 has a configuration as shown in FIGS. 2 and 3, for example. In FIG. 2, plug insertion means 52b for inserting a flow path blocking plug 52a is provided in the middle of the injection path 50. In this plug insertion means 52b, a flow path (injection path) from the fluid pressure chamber 16 is provided. ) And the flow path (injection path) to the diaphragm 20 are orthogonal to each other. Then, when the flow path blocking plug 52a is inserted into the plug insertion means 52b, the flow path from the fluid pressure chamber 16 and the flow path to the diaphragm 20 are respectively closed by the tip and side surfaces of the flow path blocking plug 52a. Thereby, the injection path 50 can be shut off. When the flow path blocking plug 52a is pulled out, the flow path from the fluid pressure chamber 16 and the flow path to the diaphragm 20 communicate with each other in the plug insertion means 52b, so that the blocking of the injection path 50 is released. In this configuration, a seal member 52c is provided on the inner surface of the plug insertion hole in the plug insertion means 52b, thereby preventing the working fluid from leaking from the plug insertion hole.

  Further, in the configuration of FIG. 3, the channel blocking plug 52a is inserted into the plug insertion hole provided in the diaphragm head. Similar to the configuration of FIG. 2, the channel blocking plug 52a is inserted and pulled out. The injection path 50 can be blocked and released.

  Next, the injection operation of the pressure transmission medium by the diaphragm pump 1 having the above configuration will be described. Since this injection operation is performed when the pump is manufactured or when the damaged diaphragm 20 is replaced, first, the two diaphragm sheets 20a and 20b are bonded together, and then the fluid is passed from the reservoir chamber 28 through the replenishment flow path 30. The working fluid is allowed to flow into the pressure chamber 16 and the operation of the pump 1 (air bleeding operation) is started.

  At this time, when the drain valve 40b of the discharge path 40 is opened and the blocking of the injection path 50 by the flow path blocking means 52 is released, a part of the working fluid flowing into the fluid pressure chamber 16 from the reservoir chamber 28 is pumped. By the action (movement of the plunger 26), it is pushed out from the fluid pressure chamber 16 into the injection path 50, and the working fluid is injected between the diaphragm sheets 20a and 20b. When the working fluid begins to be discharged to the outside through the drain valve 40b in the open state, the injection path 50 is blocked by the flow path blocking means 52, and the operation of the pump 1 is continued when the operation of the pump 1 is continued in this state. Due to the pressure, an excessive pressure transmission medium between the diaphragm sheets 20a and 20b is discharged to the outside through the check valve 40a and the drain valve 40b together with the mixed air, so that the two diaphragm sheets 20a and 20b are one diaphragm. Are pasted together. When the drain valve 40b is closed in this state, the two diaphragm sheets 20a and 20b are brought into close contact with each other via the pressure transmission medium, and the integrated diaphragm 20 is formed.

  As described above, according to the diaphragm pump 1 according to the present embodiment, when the working fluid is also used for the pressure transmission medium (for example, when the pressure transmission medium is oil in the hydraulic diaphragm pump having the above configuration). With the operation of the pump 1, a part of the working fluid in the fluid pressure chamber 16 can be injected between the diaphragm sheets 20a and 20b as a pressure transmission medium. Therefore, it is possible to eliminate the labor that has been caused by manual work using a conventional syringe or the like, and to efficiently perform injection work of the pressure transmission medium without causing scattering of the pressure transmission medium from the injection port. it can.

It is a schematic block diagram of the diaphragm pump which concerns on one Embodiment of this invention. It is a figure which shows an example of the flow-path interruption | blocking means in the diaphragm pump of FIG. It is a figure which shows an example of the flow-path interruption | blocking means in the diaphragm pump of FIG. It is a schematic block diagram of the conventional diaphragm pump.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Diaphragm pump, 12 Diaphragm head, 14 Diaphragm chamber, 16 Fluid pressure chamber, 18 Pump chamber, 20 Diaphragm, 20a, 20b Diaphragm seat, 22 Suction pipe, 22a Check valve, 24 Discharge pipe, 24a Check valve, 26 Plunger , 28 Reservoir chamber, 30 Supply channel, 30a Supply valve, 32 Release channel, 32a Relief valve, 34 Plunger seal, 36 Peripheral ring, 40 Discharge channel, 40a Check valve, 40b Drain valve, 42 Pressure detection means, 50 Injection channel, 51 check valve, 52 channel blocking means.

Claims (2)

A diaphragm for partitioning the fluid pressure chamber and the pump chamber formed by bringing two diaphragm sheets into close contact with each other via a fluid, a fluid pressure chamber for storing the working fluid, a pump chamber for the handling liquid to flow in and out, and a fluid. And a plunger for reciprocating the diaphragm via the working fluid in the fluid pressure chamber, and an injection path for passing a fluid injected between the two diaphragm sheets, and by reciprocating the diaphragm A diaphragm pump for flowing in and out of the handling liquid in the pump chamber,
The injection path is provided to communicate the fluid pressure chamber and a space formed between the two diaphragm sheets,
A diaphragm pump in which the working fluid in the fluid pressure chamber can be injected between the two diaphragm sheets through the injection path by the reciprocation of the plunger. The diaphragm pump according to claim 1, wherein
The injection path has a check valve for flowing a working fluid only in one direction from the fluid pressure chamber to the two diaphragm sheets, and a flow path blocking means for blocking the flow path. Diaphragm pump.

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