JP4195896B2 - Fluid pressure control device for pump device - Google Patents

Description

  The present invention relates to a pressure control device for a fluid for a pump device that can be applied to various pump devices such as a pump using a fluid such as compressed air as a driving source, for example, a pump or a reciprocating pump.

Conventionally, various pump devices using a diaphragm or the like are known (see, for example, Patent Document 1).
JP 2004-60633 A

  The conventional pump device such as the above-mentioned Patent Document 1 is provided with a stopping means for stopping the operation of the pump device. The stop means mechanically or electrically stops the operation of the pump device by detecting vibration such as idling or earthquake.

  However, the conventional stopping means as described above cannot detect the deformation or breakage of the parts such as the diaphragm and stop the operation of the pump device. There is a problem that damage to the device cannot be prevented. When there is deformation or breakage of parts such as a diaphragm, the pressure of the fluid such as compressed air supplied to the pump device (fluid flow state) changes. Therefore, by detecting this change in pressure, it is possible to detect deformation and breakage of parts such as diaphragms, and to prevent damage to the pump device due to deformation and breakage of parts such as diaphragms to the minimum. Can do.

  The present invention has been made in view of the above-described problems of the prior art, and detects a change in pressure (fluid flow state) of a fluid such as compressed air supplied to a pump device. An object of the present invention is to provide a pressure control device for a fluid for a pump device that can stop the operation of the device and thereby prevent damage to the pump device due to deformation or breakage of parts such as a diaphragm.

The present invention relates to a fluid for a pump device, which is provided between a fluid supply source for supplying fluid to the pump device and the pump device, and controls the pressure of the fluid supplied from the fluid supply source to the pump device. A pressure control device,
A spool valve body,
A pressure control valve having a valve inlet and a valve outlet;
The spool valve main body is
A first fluid chamber;
A second fluid chamber;
With a spool valve,
The first fluid chamber is
A first fluid chamber inlet into which a fluid supplied from the fluid supply source flows;
A pump device supply port for supplying the fluid that has flowed into the first fluid chamber from the first fluid chamber inlet to the pump device;
A pressure control valve supply port in communication with the valve inlet of the pressure control valve;
The second fluid chamber is
A second fluid chamber inlet communicating with the valve outlet of the pressure control valve;
The spool valve is slidably provided in both the first fluid chamber and the second fluid chamber,
When the pressure of the fluid in the supply port for the pump device controlled by the spool valve is lower than a predetermined set pressure , the pressure control valve is in a closed state, thereby The fluid does not flow from the first fluid chamber to the second fluid chamber;
On the other hand, when the pressure of the fluid at the pump device supply port pressure-controlled by the spool valve maintains a predetermined set pressure, the pressure control valve is in an open state, thereby The fluid flows in from the valve inlet through the pressure control valve supply port, and is discharged from the valve discharge port through the second fluid chamber inlet to the second fluid chamber. 2. A pressure control device for a fluid for a pump device, wherein the spool valve slides and closes the supply port for the pump device by discharging to the two fluid chambers, and the supply of fluid to the pump device is stopped. provide.

  Further, the pressure control valve may be composed of a three-way valve and an adjustment valve. Moreover, it is preferable that the tip end portion of the spool valve extends into the pump device supply port. The spool valve is preferably provided with an adjusting means for adjusting an extension dimension of the tip end portion of the spool valve into the pump device supply port. The fluid supply source may be a compressed air source, for example. Furthermore, the said pump apparatus can be made into the pump apparatus which used the diaphragm, for example.

  According to the present invention, by detecting a change in pressure (fluid flow state) of fluid such as compressed air supplied to the pump device, the operation of the pump device is stopped, so that deformation of parts such as a diaphragm, Damage to the pump device due to breakage can be prevented.

The best mode for carrying out the fluid pressure control device for a pump device according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the pressure control device for the fluid for the pump device. A fluid pressure control device for a pump device according to the present invention is provided between a fluid supply source (not shown) for supplying fluid to a pump device (not shown) and the pump device, and the fluid supply source To control the pressure of the fluid supplied to the pump device. The fluid supply source can be, for example, a compressed air source that supplies compressed air to the pump device, while the pump device can be, for example, a pump device using a diaphragm, but is not limited thereto.

As shown in FIG. 1, the pressure control device 1 for a fluid for a pump device includes a spool valve body 2 and a pressure control valve 3 having a valve inlet 3a and a valve outlet 3b. Hereinafter, these configurations will be described in more detail.

The spool valve main body 2 includes a first fluid chamber 4, a second fluid chamber 5, and a spool valve 6. The first fluid chamber 4 includes a first fluid chamber inlet 4a into which a fluid (for example, compressed air) supplied from a fluid supply source (not shown) flows, and a first fluid chamber inlet 4a through the first fluid chamber inlet 4a. A pump device supply port 4b for supplying fluid flowing into the fluid chamber 4 to a pump device (not shown) and a pressure control valve supply port 4c communicating with the valve inlet 3a of the pressure control valve 3 are provided. is doing. The second fluid chamber 5 has a second fluid chamber inlet 5 a communicating with the valve outlet 3 b of the pressure control valve 3.

As shown in the figure, the spool valve 6 is slidably provided in both the first fluid chamber 4 and the second fluid chamber 5. More specifically, between the first fluid chamber 4 and the second fluid chamber 5, a support cylinder portion 7 provided with one or more sealing materials 7a such as O-rings is provided. The spool valve 6 is interposed in both the first fluid chamber 4 and the second fluid chamber 5 in a state in which the spool valve 6 is slidably supported by the portion 7. Further, the flow of fluid between the first fluid chamber 4 and the second fluid chamber 5 via the support cylinder portion 7 is prevented by the sealing material 7 a of the support cylinder portion 7.

The spool valve 6 has a front end side provided in the first fluid chamber 4 and a rear end side provided in the second fluid chamber 5. And the front-end | tip part 6a of the spool valve 6 is extended in the supply port 4b for pump apparatuses. A sealing material 6b such as an O-ring is provided on the proximal end side of the distal end portion 6a. This sealing material 6b is used for the pump device when the spool valve 6 slides to the pump device supply port 4b side. This is for sealing the supply port 4b.

On the rear end side of the spool valve 6, an adjusting bolt 8 is provided as an adjusting means. The adjustment bolt 8 extends outward from the second fluid chamber 5 at the tip end side (the side not attached to the spool valve 6) through an opening 5 b provided in the second fluid chamber 5. Accordingly, by manually moving the tip side that extends outward from the second fluid chamber 5, the extension dimension of the tip portion 6a of the spool valve 6 into the pump device supply port 4b can be adjusted, The supply flow rate of the fluid passing through the pump device supply port 4b can be adjusted. Further, the spool valve 6 can be manually slid by moving the adjusting bolt 8 by hand.

Next, the pressure control valve 3 can be composed of, for example, a three-way valve 9 and an adjustment valve (REG) 10 connected to the three-way valve 9. The pressure control valve 3 in FIG. 1 is provided with a valve inlet 3a on the three-way valve 9 side and a valve outlet 3b on the adjustment valve 10 side. The pressure control valve 3, when the pressure of the fluid becomes a pressure lower than the predetermined set pressure is in the closed state, on the contrary, the set pressure of the pressure of said fluid predetermined When it is kept, it is open. Further, the pressure control valve 3 can be provided with a switch 11 that can manually switch the open / close state.

Next, the operation of the above embodiment will be described. If the pressure of the fluid in operation is normally, i.e., when the pressure of the fluid in operation is a pressure lower than a predetermined set pressure, the pressure control valve 3 is in the closed state As a result, fluid does not flow from the first fluid chamber 4 to the second fluid chamber 5 via the pressure control valve 3. Therefore, the fluid from the fluid supply source that has flowed into the first fluid chamber 4 via the first fluid chamber inlet 4a is supplied to the pump device via the pump device supply port 4b.

On the other hand, for example, when the pump device is a pump device using a diaphragm, when the diaphragm is deformed or damaged, increasing the pressure of the fluid (flow state of the fluid) is decided pressure of the fluid in operation in advance The set pressure thus set cannot be maintained, resulting in a pressure drop. In the case where the pressure of the fluid in this operation becomes a predetermined set pressure below the pressure (in the case of abnormal operation), it flows into the first fluid chamber 4 through the first fluid chamber for inlet 4a Part of the fluid supplied from the fluid supply source flows into the pressure control valve 3 from the valve inlet 3a through the pressure control valve supply port 4c and is set to have a differential pressure set by the adjustment valve 10 (for example, compressed air). Flows into the second fluid chamber 5 from the valve outlet 3b through the second fluid chamber inlet 5a. The spool valve 6 is pressed and slid by the pressure of the second fluid chamber 5. By the sliding movement of the spool valve 6, the tip 6a of the spool valve 6 further enters the pump device supply port 4b, and the pump device supply port 4b is closed (sealed) by the sealing material 6b. The supply of fluid from the fluid supply source to the pump device is stopped, so that damage to the pump device due to deformation or breakage of parts such as a diaphragm can be prevented. In the case of normal operation again after stopping, when the fluid in the second fluid chamber 5 is discharged by the switch 11, the spool valve 6 is pushed back by the pressure in the first fluid chamber 4, and the fluid from the fluid supply source is discharged. It flows into the pump device supply port 4b from the inflow port 4a and enters a normal operation state.

FIG. 1 is a cross-sectional view showing an embodiment of a fluid pressure control device for a pump device according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure control apparatus of the fluid for pump apparatuses 2 Spool valve main-body part 3 Pressure control valve 3a Valve inlet 3b Valve discharge port 4 1st fluid chamber 4a 1st fluid chamber inlet 4b Pump apparatus supply port 4c Pressure control Supply port for valve 5 Second fluid chamber 5a Inlet for second fluid chamber 6 Spool valve 6a Tip 6b Seal material 7 Support cylinder 7a Seal material 8 Adjustment bolt 9 Three-way valve 10 Adjustment valve (REG)
11 switch

Claims (6)

A fluid pressure control device for a fluid for a pump device, which is provided between the fluid supply source for supplying fluid to the pump device and the pump device, and controls the pressure of the fluid supplied from the fluid supply source to the pump device. There,
A spool valve body,
A pressure control valve having a valve inlet and a valve outlet;
The spool valve body is
A first fluid chamber;
A second fluid chamber;
With a spool valve,
The first fluid chamber is
A first fluid chamber inlet into which a fluid supplied from the fluid supply source flows;
A pump device supply port for supplying the fluid that has flowed into the first fluid chamber from the first fluid chamber inlet to the pump device;
A pressure control valve supply port in communication with the valve inlet of the pressure control valve;
The second fluid chamber is
A second fluid chamber inlet communicating with the valve outlet of the pressure control valve;
The spool valve is slidably provided in both the first fluid chamber and the second fluid chamber,
When the pressure of the fluid in the supply port for the pump device controlled by the spool valve is lower than a predetermined set pressure , the pressure control valve is in a closed state, thereby The fluid does not flow from the first fluid chamber to the second fluid chamber;
On the other hand, when the pressure of the fluid at the pump device supply port pressure-controlled by the spool valve maintains a predetermined set pressure, the pressure control valve is in an open state, thereby The fluid flows from the valve inlet through the pressure control valve supply port, and is discharged from the valve outlet through the second fluid chamber inlet to the second fluid chamber. 2. A pressure control device for fluid for a pump device, wherein the spool valve slides and closes the supply port for the pump device by discharging into the two fluid chambers, and the supply of fluid to the pump device is stopped. The said pressure control valve is comprised from the three-way valve and the adjustment valve, The pressure control apparatus of the fluid for pump apparatuses of Claim 1 characterized by the above-mentioned. The pressure control device for a fluid for a pump device according to claim 1 or 2, wherein a tip portion of the spool valve extends into the supply port for the pump device. The said spool valve is provided with the adjustment means which adjusts the extension dimension to the said pump apparatus supply port of the said front-end | tip part of the said spool valve, The fluid for pump apparatuses of Claim 3 characterized by the above-mentioned. Pressure control device. 5. The fluid pressure control device for a pump device according to claim 1, wherein the fluid supply source is a compressed air source. 6. The said pump apparatus is a pump apparatus using a diaphragm, The pressure control apparatus of the fluid for pump apparatuses as described in any one of the Claims 1 thru | or 5 characterized by the above-mentioned.

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