JPS6128882Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a composite valve that configures a control circuit by combining a fluid control valve that switches and controls the flow direction of fluid by the operation of four poppet valve bodies and a pressure reducing valve that controls pressure reduction of pressurized fluid. Regarding equipment.

Conventionally, this type of composite valve device has a supply channel 60 for supplying pressure fluid and two load channels 61 and 62 connected to a fluid actuator, as shown in FIG.
and a discharge flow path 63 connected to a low pressure section by operating four poppet valve bodies 64, 65, 66, and 67 by operating a pilot switching valve 72, thereby switching and controlling the flow direction of the fluid. and a pressure reducing valve 69 disposed in a pressure passage communicating with the supply passage 60 so as to reduce the pressure of the pressure fluid supplied to the supply passage 60. The fluid actuator is controlled by flowing the pressure fluid whose pressure has been reduced by the flow direction switching control from the supply channel 60 to one load channel 61 or the other load channel 62. However, when it is desired to perform pressure reduction control on only the pressure fluid flowing through one load flow path 61 from the supply flow path 60 and introduced into the fluid actuator, the seventh
As shown in the figure, a specially provided pressure reducing valve 70 is disposed in a connecting flow path communicating with the load flow path 61, and the fluid flowing through the load flow path 61 and led out to the discharge flow path 63 from the fluid actuator is made into a free flow. A check valve 71 must be installed in parallel with the pressure reducing valve 70 so that
In addition, when it is desired to reduce the pressure of only the pressure fluid flowing from the supply channel 60 through the other load channel 62 and introduced into the fluid actuator, a pressure reducing valve specially provided in the same way is connected to the connecting channel communicating with the load channel 62. In addition, a check valve must be installed in parallel with the pressure reducing valve.
There are disadvantages such as the pressure reducing valve is troublesome to manage and handle, the pressure reducing flow path is difficult to change, and the valve device becomes large.

The present invention eliminates such drawbacks and provides a composite valve device that can selectively perform pressure reduction control of a supply channel and two load channels with a single pressure reducing valve, making it easy to change the pressure reducing channel. It is something to do. For this reason, the present invention has a supply channel for supplying pressure fluid, two load channels connected to a fluid actuator, and a discharge channel connected to a low pressure section, and a four-channel system is provided to cut off communication between the channels. By operating the pilot switching valve, a part of the pressure fluid supplied to the supply flow path is introduced as pilot fluid into the working chamber formed on the back of the poppet valve, and the fluid in the working chamber is transferred to the low pressure section. A fluid control valve that switches and controls the flow direction of the fluid by drawing out the fluid, and a pressure flow path that communicates with the supply flow path of the fluid control valve. A valve in which a valve body is slidably fitted and a pilot fluid is introduced into only one of the working chambers formed at both ends of the valve body through a restriction, and the pilot fluid is introduced through the restriction. By controlling the pressure in the working chamber at the end of the body with a pilot valve, the valve body is slid in the axial direction by the acting force due to the pressure difference between the working chambers at both ends and the elastic force of the spring, and is inserted into the supply flow path of the fluid control valve. A pressure reducing valve that controls the supply pressure fluid to be reduced to a set pressure by a pilot valve, a pilot fluid passage in which the pressure flow path side through which the pressure reduction controlled fluid flows communicates with the working chamber of the pressure reducing valve, and a fluid control valve supply. A pilot fluid passage is provided in which the two pilot passage sides are connected to the working chamber of the pressure reducing valve, respectively, and the pilot fluid is introduced into the working chamber at the back of each poppet valve body which disconnects communication between the flow passage and the two load flow passages. , each pilot fluid passage is provided so as to be freely shut off so that the flow passage to be controlled for pressure reduction can be selected.

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

FIG. 1 is a control circuit of a composite valve device shown in partial cross section, in which a fluid control valve 1 and a pressure reducing valve 2 are joined and combined. Two load flow paths A and B connected to, and discharge flow path R connected to the low pressure section
and a drain passage R1, and four poppet valve bodies 8, 9, 10, 1 provided to cut off communication between the passages.
1, and an action chamber 1 formed on the back of each poppet valve body.
2, 13, 14, and 15, and a pilot switching valve 16 for introducing a part of the pressure fluid in the supply flow path P as a pilot fluid and for guiding the fluid in the working chamber to the low pressure section. Then, when the pilot switching valve 16 is operated to the right switching position, the pilot fluid flows into the working chamber 1 through the pilot passages 17 and 18.
2 and 15, the poppet valve bodies 8 and 11 are seated on the valve seats 23 and 26 under the action force of the pilot fluid and the elastic force of the springs 19 and 22, and the poppet valve body 9 absorbs the pressure of the load passage A. The poppet valve element 10 is separated from the valve seat 24 by the action force of the fluid, and the fluid in the action chamber 13 is led out to the drain passage R1 via the pilot passage 27, and the poppet valve element 10 is moved away from the valve seat 25 by the action force of the pressure fluid in the supply passage P. The action chamber 14 is separated from the
The fluid is passed through the pilot passage 28 to the drain passage R.
1. When the pilot switching valve 16 is operated to the left switching position, the pilot fluid is introduced into the action chambers 13, 14 through the pilot passages 27, 28, and the poppet valve bodies 9, 10 are operated by the action force of the pilot fluid and the spring 20, The poppet valve body 8 is seated on the valve seats 24 and 25 by the elastic force of the supply channel P, and the poppet valve body 8 is seated on the valve seats 23 and 25 by the force exerted by the pressure fluid in the supply flow path P.
The fluid in the working chamber 12 is removed from the pilot passage 17.
At the same time, the poppet valve body 11 separates from the valve seat 26 due to the acting force of the pressure fluid in the load flow path B, and the fluid in the working chamber 15 is guided to the drain flow path R1 through the pilot path 18. It is provided so that the direction of fluid flow can be changed by leading out the flow direction. 29, 30 are action chambers 12, 13, 14, 15
A pilot fluid passage for introducing pilot fluid to be introduced into the pressure reducing valve 2 into the pilot passages 17 and 1.
Pilot switching valve 16 communicating with 8, 27, 28
The pilot connecting passages 31 and 32 are branched from each other and opened at the side surface where the pressure reducing valve 2 is connected. 2 to 5 show the specific configuration of the pressure reducing valve 2, in which the pressure flow path 3 communicates with the supply flow path P of the fluid control valve 1 and the connections that communicate with the two load flow paths A and B. The flow paths 4 and 5, the outlet flow path 6 communicating with the discharge flow path R, and the flow path 7 communicating with the drain flow path R1 are connected to the pressure reducing valve body 3.
Both sides FA penetrates through the inside of 3 and is formed flat on the top and bottom,
The pressure reducing valve main body 33 has an opening in the FB.
Inside, there is an annular groove 3 in the longitudinal direction parallel to both sides FA and FB.
4A, 34B, and the pressure passage 3 has an inlet passage 3A communicating with the annular groove 34A of the fitting hole 35, an outflow passage 3B communicating with the annular groove 34B, and the fitting hole. 35, and the two connecting channels 4 and 5, the outlet channel 6, and the channel 7 are connected to the fitting hole 3.
It is installed so as not to interfere with 5. Reference numeral 36 denotes a valve body having a constriction portion H that is slidably fitted into the fitting hole 35 to constrict the pressure flow path 3. A constriction 37 is provided inside the valve body so as to communicate between both end faces. There is. 38
A lid member is screwed onto the valve body 33 so as to close an opening at one end of the fitting hole 35, and forms an action chamber 39 with the end face of the valve body 36. 40 is a pilot fluid passage communicating with the action chamber 39, a communication hole 41 communicating with the outflow passage 3B, two introduction holes 42 communicating with the pilot fluid passages 29, 30 of the fluid control valve 1,
43 is provided with an opening on the side FB. Flow hole 1
Closing members 44 and 45 of the same shape are provided in the first and plurality of introduction holes 42 and 43 so as to be attachable and detachable from the outside of the valve body 33, and are screwed to the communication hole 41 and the introduction hole 42 in the illustrated state. 46 is a spring provided to urge the valve body 36 toward the lid member 38 side; 47 is a spring receiving member housed in the other end of the fitting hole 35 in which the spring 46 is provided; Action chamber 48
A communicating hole 49 is formed and extends through the communicating hole 49 in the axial direction. The working chamber 48 communicates with the working chamber 39 through the throttle 37. Reference numeral 50 denotes a pilot valve body, which is screwed onto the valve body 33 so as to close the other end opening of the fitting hole 35 and has a spring receiving member 47 fixed therein. 53, the pilot fluid in the action chamber 48 is applied to the poppet valve body 52 through the communication hole 49 of the spring receiving member 47, and when the acting force exceeds the set elastic force of the spring 51, the poppet valve body 52 closes the valve. It is provided so as to be detached from the seat 53 and discharge the pilot fluid in the working chamber 48 to a drain passage 54 communicating with the flow passage 7, so that the pressure in the working chamber 48 can be controlled. Reference numeral 55 denotes an adjustment screw for adjusting the set elastic force of the spring 51.

Next, the operation will be explained.

FIG. 1 shows a rest state of the composite valve device, in which the pilot switching valve 16 of the fluid control valve 1 is in the neutral switching position, so that the pressure fluid supplied to the supply channel P via the pressure channel 3 of the pressure reducing valve 2 is A portion of the valve body is introduced into each of the working chambers 12, 13, 14, 15 as a pilot fluid, and each poppet valve body 8, 9, 10, 11 receives the acting force from the pilot fluid introduced into the working chambers 12, 13, 14, 15. It is seated on the valve seats 23, 24, 25, 26 under the elastic force of the springs 19, 20, 21, 22, and blocks the flow paths P, A, B, and R. The pressure reducing valve 2 has a valve body 36 with a spring 46 as shown in FIG.
is biased toward the left in the figure by the elastic force of
The aperture has been enlarged to the maximum.

Now, if the pilot switching valve 16 is operated to the left switching position from this state, the pilot path 17,
The fluid in the action chambers 12 and 15 is led out to the low-pressure part through the valve 18, and the pressure fluid supplied to the supply flow path P presses the poppet valve body 8 against the spring 19 to separate it from the valve seat 23. , the load flow path A, and the connection flow path 4 to operate the fluid actuator, and the fluid discharged from the fluid actuator flows through the connection flow path 5 and the load flow path B to force the poppet valve body 11 against the spring 22. It is pressed to separate from the valve seat 26, flows through the discharge channel R and the outlet channel 6, and is led out to the low pressure section. The pressure reducing valve 2 blocks the communication hole 41 with the closing member 45 and the introduction hole 42 with the closing member 44, and puts the introduction hole 43 in a communicating state, so that the supply flow path P of the fluid control valve 1 is closed.
A part of the pressure fluid is transferred as pilot fluid from the pilot connection path 32 of the pilot switching valve 16 to the pilot fluid passage 30, the introduction hole 43 of the pressure reducing valve 2,
It flows through the pilot fluid passage 40 and is introduced into the working chamber 48 via the working chamber 39 and the throttle 37. Then, the pilot fluid introduced into the action chamber 48 flows through the communication hole 4.
9 acts on the poppet valve body 52, and the poppet valve body 52 closes the valve seat 5 when the force exerted by the counter-acting pilot fluid exceeds the set elastic force of the spring 51.
3 and drain the pilot fluid to the drain passage 5.
4. The flow path 7 is led out to the low pressure part, and the pressure in the working chamber 48 decreases as the introduction of the pilot fluid is restricted by the throttle 37, and the valve body 36 is opened between the working chambers 39 and 48 formed at both ends. The acting force due to the resulting pressure difference causes the spring 46 to slide toward the right in FIG. 2 against the elastic force of the spring 46, thereby constricting the opening of the throttle portion H. Furthermore, due to the pressure drop in the action chamber 48, the poppet valve body 5
2 is seated on the valve seat 53 by the elastic force of the spring 51, the pressure difference between the action chambers 39 and 48 at both ends decreases, and the valve body 36 is slid to the left in FIG. The opening of section H is enlarged, and the pressure fluid in the supply flow path P flowing into the load flow path A of the fluid control valve 1 is controlled to be reduced to the set pressure by the spring 51.

Also, depending on the first condition, the pilot switching valve 1
6 to the right switching position, pilot path 2
The fluid in the working chambers 13 and 14 is led out to the low-pressure part through the valves 7 and 28, and the pressure fluid supplied to the supply flow path P presses the poppet valve body 10 against the spring 21 and separates from the valve seat 25. load flow path B, connection flow path 5
The fluid discharged from the fluid actuator flows through the connection flow path 4 and the load flow path A to force the poppet valve body 9 against the spring 20 and push it away from the valve seat 24. The fluid flows through the discharge channel R and the outlet channel 6 and is led out to the low pressure section, and the flow direction of the fluid is switched. Since the pressure reducing valve 2 blocks the introduction hole 42 from the closing member 44, the pilot fluid flowing through the pilot fluid passage 29 from the pilot connection path 31 of the pilot switching valve 16 of the fluid control valve 1 is not introduced, and the valve is closed. Since the action chambers 39 and 48 at both ends of the body 36 communicate with the drain passage R1 from the pilot switching valve 16 via the pilot fluid passage 30 of the fluid control valve 1, the valve body 36 is connected to the spring 46.
It is held in the position shown in FIG. 2 by the acting force of.

With this operation, the flow path for pressure reduction control is changed to the load flow path A.
To change from the pressure reducing valve 2 to the load flow path B, remove the pressure reducing valve 2 from the fluid control valve 1, and then open the introduction hole 42 of the pressure reducing valve 2.
Remove the closing member 44 screwed into the introduction hole 43.
Just screw it on. In addition, two load flow paths A and B
In order to change the pressure-reducing control flow path to the supply flow path 3 so as to perform pressure reduction control on both of
By screwing into the valve body 3 of the pressure reducing valve 2, a part of the pressure fluid in the outflow channel 3B is used as pilot fluid.
6 is introduced into the action chambers 39 and 48 at both ends, and the pressure is reduced in the same manner as described above. Therefore, the closing members 44, 4 which have already been screwed into the communication hole 41 and the introduction hole 42
Pressure reduction control of the supply flow path P and the two load flow paths A and B can be performed selectively by a simple operation of selectively changing the screwing points of 5, and the pressure reduction valve 2 can be made into a single one. , the depressurization flow path can be easily changed. Furthermore, the closing members 44 and 45 are small in shape and are screwed onto the flow holes 41 and the introduction holes 42 and 43 that form the pilot fluid passage, making them easy to handle and requiring only a change in the screwing locations of those that have already been screwed on. It is also easy to manage. Moreover, the pressure reducing valve 2 is connected to the supply flow path P.
Since the pressure fluid supplied to the supply channel P is provided to reduce the pressure, the pressure fluid in the supply channel P flows in one direction, eliminating the need to install a check valve in parallel to the pressure reducing valve 2, and preventing the valve device from becoming larger. can do. Furthermore, the pressure reducing valve 2 is connected to the pilot switching valve 16 of the fluid control valve 1 through an action chamber 1 formed at the back of each poppet valve body.
2, 13, 14, 15 is passed through the pilot fluid passages 29, 30 to the valve body 3.
Since the load flow path A or the load flow path B is introduced into the action chamber 39 formed at the sixth end and is controlled to reduce the pressure, the load flow path A is changed from the supply flow path P to the load flow path A according to the switching operation of the pilot switching valve 16. Alternatively, the pilot fluid is introduced into the action chamber 39 more quickly than the pressure fluid flowing into the load flow path B, and the pressure reduction in the load flow path A or the load flow path B is controlled with good responsiveness.

Thus, the present invention has a supply channel for supplying pressure fluid, two load channels connected to the fluid actuator, and a discharge channel connected to the low pressure part,
By operating the pilot switching valve, a portion of the pressure fluid supplied to the supply flow path is transferred to the working chamber formed on the back of the poppet valve body as pilot fluid. A pressure reducing valve that has a fluid control valve that switches and controls the flow direction of the fluid by introducing fluid in the working chamber or leading the fluid in the working chamber to a low pressure section, and a pressure flow path that communicates with the supply flow path of the fluid control valve. A valve body for restricting and controlling the pressure flow path is slidably fitted into the main body, and the pilot fluid is introduced through the throttle into only one of the working chambers formed at both ends of the valve body for introducing the pilot fluid, By controlling the pressure in the working chamber at the end of the valve body into which the pilot fluid is introduced via the throttle, the valve body is slid in the axial direction by the acting force due to the pressure difference between the working chambers at both ends and the elastic force of the spring. a pressure reducing valve that controls the pressure fluid supplied to the supply flow path of the fluid control valve to reduce the pressure to a set pressure by a pilot valve; and a pressure flow path side through which the pressure reduction-controlled pressure fluid flows communicates with an action chamber of the pressure reduction valve. Introducing the pilot fluid into the working chamber on the back of each poppet valve body, which communicates and shuts off communication between the pilot fluid passage provided, the supply passage of the fluid control valve, and the two load passages.The two pilot passage sides are communicated with the working chamber of the pressure reducing valve, respectively. Each pilot fluid passage is provided so that it can be shut off so that the flow passage to be controlled by pressure reduction can be selected, making it easy to select and shut off each pilot fluid passage. The pressure reduction control of the flow path can be performed satisfactorily with a single pressure reduction valve, and the pressure reduction flow path can be easily changed. Moreover, since the pressure reducing valve is provided to reduce the pressure of the pressure fluid supplied to the supply channel, there is no need to provide a check valve in parallel with the pressure reducing valve, and it is possible to prevent the valve device from increasing in size.

The pressure reducing valve also operates the pilot switching valve of the fluid control valve to supply pilot fluid, which is part of the pressure fluid in the supply flow path, to the working chamber at the back of each poppet valve body, to both ends of the valve body through the pilot fluid passage. Since the pilot fluid is introduced into the action chamber formed at both ends of the valve body and is controlled to reduce the pressure in the desired load flow path, the pilot fluid flows into the action chamber formed at both ends of the valve body more quickly than the pressure fluid flowing from the supply flow path to the desired load flow path. This provides effects such as being able to perform pressure reduction control in a desired load flow path with good responsiveness.

[Brief explanation of the drawing]

Fig. 1 is a control circuit diagram showing a partial cross-section of a composite valve device showing an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of a pressure reducing valve that is a part of the compound valve device, and Fig. 3 is a pressure reducing The plan view of the valve, Figs. 4 and 5, is the same as Fig. 3-
6 and 7 are control circuit diagrams showing conventional examples, respectively. DESCRIPTION OF SYMBOLS 1... Fluid control valve, 2... Pressure reducing valve, 3... Pressure channel, 29, 30, 40... Pilot fluid passage, 36... Valve body, P... Supply channel, A, B...
Load flow path, R...Discharge flow path.

Claims (1)

[Scope of utility model registration request] It has a supply channel that supplies pressure fluid, two load channels that connect to a fluid actuator, and a discharge channel that connects to a low pressure section, and has four poppet valve bodies installed to cut off communication between the channels. By operating the switching valve, a part of the pressure fluid supplied to the supply channel is introduced as pilot fluid into the action chamber formed on the back of the poppet valve body, and the fluid in the action chamber is led out to the low pressure part. A fluid control valve that switches and controls the flow direction of the fluid, and a valve body that controls the constriction of the pressure flow path can be slid freely into the pressure reducing valve body, which has a pressure flow path that communicates with the supply flow path of the fluid control valve. mated,
The pilot fluid is introduced into only one of the working chambers formed at both ends of the valve body through a restriction, and the pressure in the working chamber at the end of the valve body into which the pilot fluid is introduced through the restriction is controlled by the pilot valve. By controlling the valve body, the valve body is slid in the axial direction by the acting force due to the pressure difference between the working chambers at both ends and the elastic force of the spring, and the pressure fluid supplied to the supply flow path of the fluid control valve is adjusted to the set pressure by the pilot valve. A pressure reducing valve that performs pressure reduction control, a pilot fluid passage that connects the pressure flow path side through which the pressure reduction controlled fluid flows to the action chamber of the pressure reducing valve, and a supply flow path of the fluid control valve and two load flow paths are communicated with each other. The pilot fluid passage has two pilot passages for introducing the pilot fluid into the action chamber on the back of each poppet valve body to be shut off, each of which communicates with the action chamber of the pressure reducing valve, and each pilot fluid passage is a flow passage for pressure reduction control. A composite valve device that can be shut off freely so that the following can be selected.