JPH0454499Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a stacked pressure reducing valve used in a stacked liquid control device.

[Conventional technology]

Conventionally, this type of stacked pressure reducing valve
As shown in Publication No. 25054, the valve body is slidably inserted into the fitting hole of the valve body, and the shaft is adjusted by the opposing action of the elastic force of the elastic member whose elastic force is adjusted by the adjusting screw and the acting force of the pressure liquid. A device is known in which the pressure liquid flowing in the liquid passage is controlled to be reduced by a set pressure caused by the elastic force of an elastic member.

[Problem that the invention attempts to solve]

However, in a laminated pressure reducing valve with such a configuration, when the operator wants to change the pressure liquid flowing through the liquid passage into two stages: pressure reduction control at a low pressure setting and pressure reduction control at a high pressure setting, the operator rotates the adjustment screw and moves the elastic member. There was a problem in that the elastic force of the elastic force had to be adjusted, and the adjustment could not be done quickly and accurately, making it impossible to easily change the adjustment.

The present invention solves these problems, and has two
The different set pressures set by each pilot valve can be switched and selected by energizing and de-energizing the solenoid valve, and the pressure liquid can be easily changed into two stages: low pressure setting pressure reduction control and high pressure setting pressure reduction control. The purpose of the present invention is to provide a laminated type vacuum.

[Means for solving problems]

The structure of the present invention, which was created to solve such problems, has a main body in which a plurality of liquid passages are opened on both opposing sides and are arranged through the main body so that they can be laminated freely. A valve body is provided that is slidably inserted into the valve body and biased in one direction by the elastic force of an elastic member, and the pilot liquid is introduced into only one of the working chambers formed at both ends of the valve body. The first sub-body and the second sub-body are removably attached to opposite side surfaces substantially perpendicular to the side surfaces of the main body through which the plurality of liquid passages are opened. A first communication passage is formed in the first sub-body, one end of which communicates with the working chamber at the main end of the valve into which the pilot liquid is introduced via a throttle, and the other end of which communicates with the liquid passage on the low-pressure side of the main body; The first pilot valve sets the pressure of the working chamber at the end of the valve body to a low pressure and the second pilot valve sets the pressure of this working chamber to a high pressure. The valves are located upstream from the second pilot valve and arranged in series, one end of which communicates between the first pilot valve and the second pilot valve of the first communication passage, and connects the first sub-body and the second sub-body. A second communicating passage is formed in the first sub-body, the second communicating passage opening on both sides to be attached and having the other end communicating with the through-passage provided through the main body, and the second sub-body having one end communicating with the through-passage of the main body. A third communicating passage is formed, the other end of which communicates with the liquid passage on the low pressure side of the main body, and the third communicating passage receives a force acting on the valve body due to the pressure difference between the working chambers at both ends by opening and closing the third communicating passage. By sliding in the axial direction with the elastic force of the elastic member, the pressure liquid flowing through the liquid passage can be freely changed between pressure reduction control with a low pressure setting using the first pilot valve and pressure reduction control with a high pressure setting using the second pilot valve. A solenoid valve is provided to open and close the third communication passage by energizing and de-energizing operations.

[Effect]

In the configuration of the present invention, the third communicating passage is opened and closed by energizing and de-energizing the solenoid valve, and when the third communicating passage is opened, the operating chamber formed at the end of the valve body into which the pilot liquid is introduced through the throttle is opened. The pressure of the liquid is set to a low pressure in the first communication passage by a first pilot valve located upstream of the second pilot valve, and the pressure liquid flowing through the liquid passage is controlled to be reduced to the low pressure setting. Further, when the third communicating passage is closed, when the pressure in the working chamber exceeds the low pressure setting by the first pilot valve and the pilot liquid in the working chamber flows downstream of the first pilot valve, the third communicating passage is closed. Acts on the second pilot valve without flowing out to the low pressure side liquid passage through the communication passage, sets the pressure in the working chamber to a high pressure by the second pilot valve, and reduces the pressure of the pressure liquid flowing through the liquid passage to the high pressure setting. do. For this reason, changing the pressure liquid flowing through the liquid passage between pressure reduction control at a low pressure setting and pressure reduction control at a high pressure setting can be performed with good responsiveness and accuracy with a simple operation of energizing and de-energizing the solenoid valve. The liquid can be easily changed into two stages: pressure reduction control with a low pressure setting and pressure reduction control with a high pressure setting.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIGS. 1 and 2, reference numeral 1 indicates a valve body composed of a main body 2, a first sub-body 3, and a second sub-body 4. The main body 2 is provided with a fitting hole 7 in which annular grooves 5 and 6 are spaced apart in the axial direction, and a liquid passage P1 that communicates with the annular groove 5 of the fitting hole 7 and introduces pressure liquid. A liquid passage P2 that communicates with the annular groove 6 and leads out the pressure liquid is opened on the side surface F1 and on the side surface F2 opposite to F1. Two liquid passages A, B connecting to the side
Two liquid passages R1 and R2 connected to the low pressure side are disposed through the liquid passages and formed so as to be stackable. A valve body 8 is slidably inserted into the fitting hole 7 and forms a constricted portion H with the annular groove 6. Reference numerals 9 and 10 indicate working chambers formed at both ends of the valve body 8, and are provided so as to communicate through a throttle 11. The working chambers 9 are connected to the liquid passage P2 from the passage 12 through a switching member 13 attached to the side surface of the main body 2. It's communicating. By changing the mounting direction, the switching member 13 changes the liquid path communicating with the action chamber 9 to A.
Or B can be freely selected. Reference numeral 14 denotes an elastic member, which is housed in the action chamber 10 and uses the elastic force of the attachment to urge the valve body 8 toward the left in the figure to open the throttle portion H. Reference numeral 15 denotes a through passage disposed through the main body 2, which opens to both side faces F3 and F4 that are substantially perpendicular to the side faces F1 and F2 of the main body 2 and facing each other. The first sub-body 3 is detachably attached to the side surface F3 of the main body 2,
A first communication passage 18 is formed inside, one end of which communicates with the passage 16 from the action chamber 10 that opens on the side face F3, and the other end that communicates with the passage 17 from the low-pressure side liquid passage R2 that opens on the side face F3; A first pilot valve 2 for setting the pressure of the working chamber 10 to a low pressure in the first communication passage 18
1 and a second pilot valve 28 for setting the pressure in the working chamber 10 to a high pressure are arranged in series with the first pilot valve 21 located upstream of the second pilot valve 28, that is, on the working chamber 10 side. The first pilot valve 21 is provided with a poppet valve body 25 that is seated on a valve seat 24 in the valve chamber 23 of the pilot valve body 22, and an elastic member 26 that urges the poppet valve body 25 toward the valve seat 24. When the pilot liquid in the action chamber 10 is introduced into the valve chamber 27 and its acting force exceeds the elastic force of the elastic member 26, the poppet valve body 25 is separated from the valve seat 24 and the introduced pilot liquid is transferred from the valve chamber 23 to the first pilot valve. First communication passage 18 downstream of valve 21
It has a flow to it. Second pilot valve 28
is provided with a poppet valve body 29 and an elastic member 31 that urges the poppet valve body 29 toward the valve seat 30, and the pilot liquid in the action chamber 10 is introduced into the valve seat passage 32 via the first pilot valve 21, and its action is controlled. When the force exceeds the elastic force of the elastic member 31, the introduced pilot liquid flows out from the valve chamber 33 to the liquid passage R2 on the low pressure side. 34 is the first pilot valve 21
a screw member 35 for adjusting the elastic force of the elastic member 26 of the second pilot valve 28;
The elastic force of the elastic member 31 is set to be larger than the elastic force of the elastic member 26. Reference numeral 41 denotes a second communication passage formed inside the first sub-body 3, one end of which communicates between the first pilot valve 21 and the second pilot valve 28 of the first communication passage 18, and a side surface of the through-passage 15 of the main body 2. The other end communicates with the F3 opening side. The second sub-body 4 is removably attached to the side F4 opposite to the side F3 of the main body 2, and inside the side F4 of the through passage 15 of the main body 2.
A third communication passage 20 is formed, one end of which communicates with the opening side and the other end of which communicates with the passage 19 from the liquid passage R1 on the low pressure side, which is open to the side surface F4, and a solenoid valve 3 is provided in the third communication passage.
6 are installed. The solenoid valve 36 is connected to the third communication path 20
It has a spool valve body 37 that can be opened and closed freely, and the movable iron core 3 is operated by energizing the coil 38 of the electromagnetic device.
The suction force acting on the coil 38 operates the spool valve body 37 against the elastic force of the elastic member 40 to open the third communication passage 20, and when the coil 38 is de-energized, the spool valve body 37 is activated by the elastic force of the elastic member 40. 37 to close the third communicating path 20.

Next, the operation of this configuration will be explained.

FIG. 1 shows the electromagnetic valve 36 in a non-energized state, and the spool valve body 37 is urged toward the left end in the figure by the elastic force of the elastic member 40 to close the third communicating path 20.
The valve body 8 is urged toward the left end in the figure by the elastic force of the elastic member 14, and opens the throttle portion H to the maximum.

Now, the pressure liquid introduced into the liquid passage P1 is led out from the annular groove 5 through the constriction part H and the annular groove 6 to the liquid passage P2, and a part of it is passed through the switching member 13 and the passage 12 as a pilot liquid to the action chamber 9 and further. It is introduced into the action chamber 10 through the aperture 11. Then, the pilot liquid in the action chamber 10 is introduced into the introduction passage 27 of the first pilot valve 21 set at a low pressure, and is then introduced into the poppet valve body 25.
It acts on The poppet valve body 25 separates from the valve seat 24 when the force exerted by the counteracting pilot liquid exceeds the elastic force of the elastic member 26, and the poppet valve body 25 releases the pilot liquid from the valve chamber 23 to the first valve valve 21 downstream of the first pilot valve 21. Flow into passage 18. The pilot liquid flowing downstream of the first pilot valve 21 passes through the second communication passage 41 and the third communication passage 20 closed by the solenoid valve 36 from the through passage 15 to the low pressure side liquid passage R1.
It is introduced into the introduction passage 32 of the second pilot valve 28, which has a high pressure setting in which the elastic force of the elastic member 31 is set larger than that of the first pilot valve 21, and acts on the poppet valve body 29. Poppet valve body 2
9 separates from the valve seat 30 when the acting force of the opposing pilot liquid exceeds the elastic force of the elastic member 31, and releases the pilot liquid from the valve chamber 33 to the second valve chamber 33.
The liquid flows out through the first communication passage 18 and passage 17 on the downstream side of the pilot valve 28 to the liquid passage R2 on the low pressure side, and the pressure in the working chamber 10 decreases because the introduction of the pilot liquid is restricted by the throttle 11, and the pressure in the working chamber 10 decreases. The body 8 is slid in the axial direction on the right in the figure against the elastic force of the elastic member 14 due to the acting force due to the pressure difference generated between the action chambers 9 and 10 at both ends, thereby constricting the throttle portion H and closing the liquid passage P.
The flow rate of the pressure liquid flowing from P1 to P2 is reduced. Furthermore, due to the pressure drop in the working chamber 10, the second
When the poppet valve body 29 of the pilot valve 28 is seated on the valve seat 30 due to the elasticity of the elastic member 31,
The valve body 8 is slid in the axial direction on the left in the figure by the elastic force of the elastic member 14 as the pressure difference between the action chambers 9 and 10 at both ends is reduced, and the throttle portion H is enlarged and the pressure flowing from the liquid passage P1 to P2 is increased. The flow rate of the liquid is increased, and the pressure liquid flowing through the liquid passage P2 is controlled to be reduced to a high pressure setting by the second pilot valve 28. Next, the coil 38 of the solenoid valve 36 is energized and the spool valve body 37 is
When the third communication passage 20 is opened by operating the third communication passage 20 in the right direction in the figure against the elastic force of the elastic member 40, the pilot liquid that has flowed from the valve chamber 23 of the first pilot valve 21 to the first communication passage 18 is transferred to the second communication passage 18. passage 41, through passage 15, third
Low pressure side liquid passage R via communication passage 20 and passage 19
1, the pressure in the working chamber 10 is set to a low pressure by the first pilot valve 20, and the valve body 8 is connected to the liquid passage P.
The pressure liquid flowing through the valve 2 is controlled to be reduced to a low pressure setting by the first pilot valve 21.

When the coil 38 of the electromagnetic valve 36 is de-energized, the spool valve pair 37 is moved back to the illustrated position by the elastic force of the elastic member 40 to close the third communicating path 20. The pressure in the working chamber 10 is controlled by the second pilot valve 2.
8, and the valve body 8 controls the pressure liquid flowing through the liquid passage P2 to reduce the pressure to the high pressure setting by the second pilot valve 28.

With this operation, changing the pressure liquid flowing from the liquid passage P1 to P2 between pressure reduction control with a low pressure setting and pressure reduction control with a high pressure setting can be performed accurately and responsively by a simple operation of energizing and de-energizing the solenoid valve 36. The pressure liquid can be easily changed into two stages: pressure reduction control with a low pressure setting and pressure reduction control with a high pressure setting. Furthermore, since the low pressure setting and the high pressure setting are set respectively in the first pilot valve 21 and the second pilot valve 28, each set pressure must be set in advance before the valves are operated. This allows accurate two-step control to be quickly obtained. Moreover, by opening and closing the solenoid valve 36, the liquid passage P
When the pressure liquid flowing through the pilot valve 2 is controlled to be reduced to the set pressure of the first pilot valve 21 or the second pilot valve 28, the set pressure of the other pilot valve 28 or 21 can be adjusted and the valve operation can be stopped. The set pressures of the first pilot valve 21 and the second pilot valve 28 can be adjusted satisfactorily. Furthermore, since the third communicating passage 20 is opened and closed by the solenoid valve 36, changing operations can be conveniently controlled remotely. Furthermore, since the valve body 1 is composed of the main body 2, the first sub-body 3, and the second sub-body 4, the main body 2 can remain disposed between the laminated valves, and the first sub-body 3 and Second sub-body 4
can be replaced as appropriate, and the first sub-body 3 can be replaced as appropriate.
Inside, one end communicates with a passage 16 from the action chamber 10 opened on the side face F3 of the main body 2, and the other end communicates with a passage 15.
By forming a communication passage communicating with the opening side of the side face F3 and replacing it with another sub-body in which a single pilot valve is disposed in this communication passage, the liquid passages P1 to P2 can be
By opening and closing the electromagnetic valve 36, it is possible to obtain a control function for controlling or not controlling the pressure liquid flowing to the pump.

In addition, in one embodiment, the fitting hole 7 and the liquid passage P1,
Although P2 is provided in communication, it goes without saying that it may be provided in communication with liquid passage A or B.

[Effect of idea]

As described above, according to the present invention, the pilot liquid is introduced through the restrictor into only one of the action chambers into which the pilot liquid is introduced at both ends of the valve body which is inserted into the main body of the valve body so as to be stackable. A first sub-body and a second sub-body are provided on opposite side surfaces that are substantially perpendicular to the side surface of the main body where the plurality of liquid passages are opened.
A sub-body is removably attached, and the first sub-body has a first sub-body having one end communicating with the working chamber at the end of the valve body into which the pilot liquid is introduced through the throttle and the other end communicating with the liquid passage on the low pressure side of the main body. A first pilot valve that sets a high pressure in a working chamber at the end of the valve body into which a pilot liquid is introduced through a throttle; The two pilot valves are arranged in series with the first pilot valve located upstream of the second pilot valve, and one end communicates between the first pilot valve and the second pilot valve in the first communication passage, and the first sub-main body is connected to the first pilot valve. A second communication passage is formed in the first sub-body, and the second communication passage is open on both sides to which the second sub-body is attached, and the other end communicates with the through-path provided through the main body. A third communication passage is formed, one end of which communicates with the through passage of the main body, and the other end of which communicates with the liquid passage on the low pressure side of the main body, and the third communication passage has a valve body that connects the valve body between both ends of the action chamber by opening and closing the third communication passage. The pressure liquid flowing through the liquid passage by sliding in the axial direction by the acting force due to the pressure difference and the elastic force of the elastic member is controlled to reduce the pressure at a low pressure setting by the first pilot valve, and the pressure reduction at the high pressure setting by the second pilot valve. By installing a solenoid valve that opens and closes the third communication passage by energizing and de-energizing operation, the pressure liquid flowing through the liquid passage can be changed to low pressure setting pressure reduction control and high pressure setting pressure reduction control. This can be done with high responsiveness and accuracy with a simple operation of energizing and de-energizing the solenoid valve, and the pressure liquid can be easily changed into two stages: depressurization control with a low pressure setting and depressurization control with a high pressure setting. I can do it.

In addition, since the low pressure setting and high pressure setting are set separately for the first and second pilot valves, each setting pressure can be set in advance before the valve is activated. , accurate two-step control can be quickly obtained. Moreover, when the pressure is being reduced to the set pressure of either the first pilot valve or the second pilot valve, the set pressure of the other pilot valve can be adjusted without stopping the valve operation. The set pressures of the first pilot valve and the second pilot valve can be adjusted well. Furthermore, the solenoid valve allows for good remote control. Furthermore, by replacing the sub-body with another sub-body without changing the main body, other control functions can be easily obtained and the range of uses can be expanded.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of a stacked pressure reducing valve, and FIG. 2 is a cross-sectional view taken along the line -
FIG. 2...Main body, 3...First sub-body, 4...Second
Sub-body, 7... Fitting hole, 8... Valve body, 9, 10...
...Action chamber, 11...Aperture, 15...Through passage, 18
...First communication path, 20...Third communication path, 21...
1st pilot valve, 28... 2nd pilot valve,
36...Solenoid valve, 41...Second communication path, P1, P
2, A, B, R1, R2...Liquid passage.

Claims (1)

[Scope of utility model registration request] It has a main body in which a plurality of liquid passages are opened on both opposing sides and are arranged so that they can be laminated freely. A valve element is provided which is biased toward the main body, and the pilot liquid is introduced into only one of the operating chambers formed at both ends of the valve element through a restrictor, and the pilot liquid is introduced through the main body. A first sub-body and a second sub-body are removably attached to opposite side surfaces substantially perpendicular to the side surface in which the plurality of liquid passages are opened, and a valve into which a pilot liquid is introduced through a throttle is provided in the first sub-body. A valve body forming a first communication passage whose one end communicates with the action chamber at the body end and whose other end communicates with the liquid passage on the low pressure side of the main body, and into which the pilot liquid is introduced through a restriction. A first pilot valve that sets the pressure in the end working chamber to a low pressure and a second pilot valve to set the pressure in the working chamber to a high pressure are arranged in series with the first pilot valve being located upstream of the second pilot valve. a through passage provided through the main body and having one end communicating with the first pilot valve and the second pilot valve of the first communication passage and opening on both sides to which the first sub body and the second sub body are attached; A second communication passage is formed in the first sub-body, the other end of which communicates with the passageway of the main body, and the second sub-body has a second communication passage with one end communicating with the through-path of the main body and the other end communicating with the liquid passage on the low pressure side of the main body. Three communication passages are formed, and liquid is supplied to the third communication passage by sliding the valve body in the axial direction by the pressure difference between the two end working chambers and the elastic force of the elastic member by opening and closing the third communication passage. A solenoid valve is arranged to open and close the third communication passage by energizing and de-energizing operation so that the pressure liquid flowing through the passage can be freely changed between pressure reduction control with a low pressure setting by the first pilot valve and pressure reduction control with a high pressure setting by the second pilot valve. Stacked pressure reducing valve.