JP2767708B2 - Pilot operated switching valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a supply chamber for supplying compressed air and a pneumatic pressure by opening and closing a supply valve seat and an exhaust valve seat by operating a main valve by a pilot valve. The present invention relates to a pilot operation switching valve that disconnects communication between an output chamber connected to an actuator and an exhaust chamber released to the atmosphere.

[Conventional technology]

Conventionally, as shown in FIG. 5, this kind of pilot operated switching valve is provided with a supply chamber 1 having a supply port P for supplying compressed air, an output chamber 2 having an output port A connected to a pneumatic actuator, and an open air. And an exhaust chamber 3 having an exhaust port E to be provided in the valve body 4 with an interval in the axial direction in sequence.
The supply chamber 1 communicates with the output chamber 2 through supply holes 5 and 6, and the output chamber 2 communicates with the exhaust chamber 3 through exhaust holes 7 and 8. Detach and supply valve seats 9, 10
Supply valve portions 11 and 12 that open and close the exhaust valve seats 13 and 14 that are attached to and detached from the exhaust valve seats 13 and 14 that are located in the exhaust chamber 3.
A valve body in which supply holes 15 and 16 pass through supply holes 5 and 6 and exhaust holes 7 and 8
The main valves 19 and 20 are configured so as to be integrally movable with the main valves 19 and 20. When the pilot valves 21 and 22 shown in FIG.
The pilot compressed air in the working chambers 23 and 24 formed at the ends of the 20 is exhausted, and the main valves 19 and 20 are moved upward in the drawing as the other direction by the force of the springs 25 and 26. Are seated on the supply valve seats 9 and 10 to shut off between the supply chamber 1 and the output chamber 2, and the exhaust valve parts 15 and 16 are separated from the exhaust valve seats 13 and 14 and between the output chamber 2 and the exhaust chamber 3. And the compressed air of the pneumatic actuator connected to the output chamber 2 is exhausted from the exhaust chamber 3.
In the state shown in the drawing, when the pilot valves 21 and 22 are energized, pilot compressed air is supplied to the working chambers 23 and 24 and the main valves 19 and 20 are supplied.
Is moved downward in the drawing as one direction by resisting the springs 25 and 26 by the action force based on the pilot compressed air supplied to the action chambers 23 and 24, and the supply valve portions 11 and 12 are moved to the supply valve seats 9 and 10 The supply chamber 1 and the output chamber 2 are further separated from each other to communicate with each other, and the exhaust valve sections 15 and 16 are seated on the exhaust valve seats 13 and 14 to shut off the space between the output chamber 2 and the exhaust chamber 3. Compressed air in the supply chamber 1 is supplied to the pneumatic actuator connected to the controller to control the operation. When the exhaust valves 15 and 16 are seated on the exhaust valve seats 13 and 14 due to the downward movement of the main valves 19 and 20, the supply valve portions 11 and 12 are detached from the supply valve seats 9 and 10 respectively. The rear surface opposite to the separated surface is brought into contact with the valve body 4 to obtain a buffering action.

[Problems to be solved by the invention]

However, the supply valve portions 11 and 12 are formed of a rigid material, and elastically deformable elastic materials are provided on the attachment / detachment surfaces of the supply valve seats 9 and 10 in order to obtain a closed property when the supply valve seats 9 and 10 are closed. The seal members 27 and 28 must be disposed particularly, and the back surfaces of the supply valve portions 11 and 12 are provided to obtain a buffering action when the exhaust valve portions 15 and 16 are seated on the exhaust valve seats 13 and 14. The buffer members 29 and 30 made of an elastic material which can be elastically deformed must be specially disposed on the valve body 4 to be in contact with the valve body 4, and there is a problem that the number of parts is large and the configuration is complicated.

The present invention solves such a problem, so that the number of parts can be reduced to obtain a good closing property when closing the supply valve seat and a buffering action when the exhaust valve section is seated on the exhaust valve seat. The present invention provides a pilot operated switching valve.

[Means for solving the problem]

For this reason, the present invention provides a supply chamber for supplying compressed air, an output chamber connected to the pneumatic actuator, and an exhaust chamber for releasing to the atmosphere in the valve body with a space in the axial direction in order. The chambers are communicated with each other by a supply hole, and the output chamber and the exhaust chamber are communicated with each other by an exhaust hole coaxial with the supply hole. A supply valve seat is formed around the supply hole opening of the supply chamber, and around the exhaust hole opening of the exhaust chamber. The exhaust valve seat is formed, and the supply valve seat is located in the supply chamber so that the supply valve seat is opened and the exhaust valve seat is closed by moving in one direction, and the supply valve seat is closed and the exhaust valve seat is opened by the movement in the other direction. The supply valve portion that opens and closes the supply valve seat by detaching from the valve and the exhaust valve portion that is located in the exhaust chamber and detaches from the exhaust valve seat to open and close the exhaust valve seat move integrally with the valve body that passes through the supply hole and the exhaust hole. The main valve is constructed as possible and supplies pilot compressed air to the working chamber formed at the end of the main valve. A pilot valve for operating the main valve in a pilot manner by exhausting pilot compressed air from the working chamber, the supply valve section is formed integrally with an elastic material so as to be elastically deformable, The opposing back surface is provided so that the supply valve seat is opened and the exhaust valve seat is closed so that the main valve can move in one direction and abut on the valve body.

[Action]

In such a configuration, the supply valve portion integrally formed of an elastic material so as to be elastically deformable is seated on the supply valve seat by moving in the other direction of the main valve, closes the supply valve seat to obtain a closeability, and one direction of the main valve. When the exhaust valve section is seated on the exhaust valve seat by moving to the rear side, the supply valve section is elastically deformed by the back surface opposite to the surface where the supply valve section is attached to and detached from the supply valve seat, and the cushioning action is performed. obtain. For this reason, it is possible to eliminate the need for a member for obtaining the obstruction when closing the supply valve seat and a member for obtaining a buffering action when the exhaust valve portion is seated on the exhaust valve seat, so that the number of parts can be reduced. , And a good closing property when the supply valve seat is closed and a cushioning effect when the exhaust valve portion is seated on the exhaust valve seat can be obtained.

〔Example〕

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

In FIG. 1, reference numeral 31 denotes a valve body, which has a supply chamber 32 having a supply port P for supplying compressed air, an output chamber 33 having an output port A connected to a pneumatic actuator, and an exhaust having an exhaust port E open to the atmosphere. The supply chamber 32 and the output chamber 33 communicate with each other through two supply holes 35 and 36 arranged in parallel, and the output chamber 33 and the exhaust chamber 34 are provided. The space is coaxial with the supply holes 35 and 36 and communicates with two exhaust holes 37 and 38 arranged in parallel and having a larger diameter than the supply holes 35 and 36. 39 and 40 are supply valve seats formed around the supply holes 35 and 36 of the supply chamber 32, and 41 and 42 are exhaust holes 37 and 38 of the exhaust chamber 34.
It is an exhaust valve seat formed around the opening. 43 and 44 are the valve body 31
The two main valves are arranged in parallel so as to be movable in the axial direction into the inside.
Supply valve portions 45 and 46 for opening and closing 9, 40; exhaust valve portions 47 and 48 located in the exhaust chamber 34 for opening and closing the exhaust valve seats 41 and 42 while being attached to and detached from the exhaust valve seats 41 and 42; The supply valve portions 45 and 46 are provided at the lower part in the axial direction so that the supply valve portions 45 and 46 and the exhaust valve portions 47 and 48 are integrally moved through the exhaust holes 37 and 38 and the exhaust valve portions at the upper part in the axial direction. 47 and 48 are respectively constituted by valve bodies 49 and 50 which are penetrated and locked. The main valves 43, 44 are moved upward in the other direction, and the supply valve portions 45, 46
The exhaust valve portions 47, 48 open the exhaust valve seats 41, 42, and the supply valve portions 45, 46 open the supply valve seats 39, 40 by moving downward in the figure as one direction, and open the exhaust valve portions 47, 48. Are provided with supply valve portions 45, 46 and exhaust valve portions 47, 48 so as to close the exhaust valve seats 41, 42. The valve bodies 49 and 50 are provided with pistons 51 and 52 at the upper part in the axial direction where the exhaust valve parts 47 and 48 are penetrated and engaged with the exhaust valve parts 47 and 48, and the supply valve parts 45 and 46 are penetrated. The stopped lower portion in the axial direction is axially slidably and axially slidably supported by lid members 53 and 54 which are fixed to the valve body 31. As shown in detail in FIGS. 2 to 4, the exhaust valve portion 47 is integrally formed of urethane rubber (see JISK6200) as an elastic material so as to be elastically deformable. When seated on 41, it is elastically deformed to obtain a cushioning effect. The supply valve portion 45 is integrally formed of urethane rubber as an elastic material so as to be elastically deformable similarly to the exhaust valve portion 47, and detaches from the supply valve seat 39 when the exhaust valve portion 47 sits on the exhaust valve seat 41. A back surface 45B facing the surface 45A is provided so as to be able to contact the lid member 53 provided in the valve body 4,
When the back surface 45B abuts on the lid member 53, the back surface 45B itself is elastically deformed, so that the exhaust valve portion 47 further obtains a cushioning effect when seated on the exhaust valve seat 41. And supply valve part 45 is back 45B
When the valve body 49 is elastically deformed by contacting the lid member 53, a radial gap H is formed between the valve body 49 and the valve body 49 so that the valve body 49 is uniformly elastically deformed in the radial direction so that a force for twisting the valve body 49 with respect to the axis is not applied. ing. Although only the supply valve section 45 and the exhaust valve section 47 have been described, the supply valve section 46 and the exhaust valve section 48 have the same configuration. 55, 56 are valve elements 49, which penetrate the supply holes 35, 36,
O-rings arranged on the shaft of 50 and fitted to the supply holes 35 and 36,
Even if the supply valve portions 45 and 46 are separated from the supply valve seats 39 and 40 by the downward movement of the main valves 43 and 44, the supply chambers 32 and the output chamber 33 are kept in sealing contact with the inner circumferences of the supply holes 35 and 36. The main valves 43 and 44 are further moved downward so that the exhaust valve portions 47 and 48 are moved to the exhaust valve seats 41 and 42.
Before the user sits on the floor, it is separated from the supply holes 35 and 36 so as to communicate between the supply chamber 32 and the output chamber 33. 57 and 58 are main valves 43,
At the end of the piston 44 on the side where the pistons 51 and 52 are disposed, the piston 51, 52, the valve body 31, and the pilot valve body 59 disposed above the valve body 31 form an operation chamber which is partitioned. 60 and 61 are pilot valve bodies 59
A pilot valve for pilot-operating the main valves 43 and 44, which is connected to the supply chamber 32 via a pilot compressed air path 62 to supply pilot compressed air.
64 and pilot output paths 65 and 66 connected to the working chambers 57 and 58, and pilot exhaust paths 67 and 68 released to the atmosphere. It moves downward to close the pilot supply passages 63 and 64, communicates between the pilot output passages 65 and 66 and the pilot exhaust passages 67 and 68, exhausts the pilot compressed air in the working chambers 57 and 58, and
44 is moved upward by the force of the springs 73 and 74. The pilot passages are supplied to the working chambers 57 and 58 by communicating between the output passages 65 and 66 and the pilot supply passages 63 and 64, and the main valves 43 and 44 are supplied.
Are moved downward against the forces of the springs 73 and 74 by the action force based on the pilot compressed air supplied to the action chambers 57 and 58.

 Next, the operation of this configuration will be described.

1 and 2 show the non-energized state of the pilot valves 60 and 61, and the pilot compressed air in the working chambers 57 and 58 is exhausted through the pilot output paths 65 and 66 and the pilot exhaust paths 67 and 68. The main valves 43 and 44 are actuated by springs 73 and 74 and the supply chamber 32.
The supply valve portions 45 and 46 are seated on the supply valve seats 39 and 40 to close the supply valve seats 39 and 40, and the exhaust valve portions 47 and 48 are The exhaust valve seats 41 and 42 are opened by separating from the exhaust valve seats 41 and 42, the O-rings 55 and 56 are fitted into the supply holes 35 and 36 to close the supply holes 35 and 36, and the supply chamber 32 and the output chamber The gap between the output chamber 33 and the output chamber 33 is communicated with each other, and the compressed air of the pneumatic actuator connected to the output chamber 33 is exhausted. From this state. When the pilot valves 60 and 61 are energized, the pilot supply paths 63 and 64 and the pilot output paths 65 and 66
Communication between pilot output passages 65 and 66 and pilot exhaust passage
The space between 67 and 68 is shut off, and a part of the compressed air in the supply chamber 32 is used as pilot compressed air from the pilot compressed air passage 62 through the pilot supply passages 63 and 64 and the pilot output passages 65 and 66 to the working chambers 57 and 58. The main valves 43 and 44 are supplied to the working chambers 57 and 58
Spring by the acting force based on the pilot compressed air supplied to the
The supply valve portions 45, 46 move downward against the forces 73, 74 and the acting force based on the compressed air in the supply chamber 32, and the supply valve portions 45, 46 are separated from the supply valve seats 39, 40 to supply the supply valve seats 39, 40. The exhaust valve portions 47, 48 are seated on the exhaust valve seats 41, 42 to close the exhaust valve seats 41, 42, and the O-rings 55, 56 are separated from the supply valve portions 39, 40 by the supply valve portions 45, 46. After seating, the exhaust valve parts 47 and 48 move further downward to exhaust valve seats.
Before sitting on 41, 42, remove from the supply holes 35, 36 and supply holes
35 and 36 are opened, the communication between the supply chamber 32 and the output chamber 33
And the exhaust chamber 34 are shut off, and the pneumatic actuator connected to the output chamber 33 is supplied with the compressed air in the supply chamber 32 and is operated. This downward movement causes the exhaust valve portion 47 to be elastically deformed by being pressed against the exhaust valve seat 41 when seated on the exhaust valve seat 41 as shown in FIG. obtain. The supply valve portion 45 is provided with an exhaust valve portion 47 as shown in FIG.
When the back seat 45B does not come into contact with the lid member 53 at the moment when it is seated on the exhaust valve seat 41, and when the exhaust valve portion 47 is elastically deformed, as shown in FIG. As a result, a further damping effect is obtained when the exhaust valve portion 47 is seated on the exhaust valve seat 41.
Although the exhaust valve section 47 and the supply valve section 45 have been described, the same applies to the exhaust valve section 48 and the supply valve section 46. In this state, when the pilot valves 60 and 61 are de-energized, the state returns to the state shown in FIG. 1 and the pilot supply paths 63 and 64 are disconnected from the pilot output paths 65 and 66, and the pilot output paths 65 and 66 are connected to the pilot output paths 65 and 66. The exhaust paths 67 and 68 communicate with each other, and the main valves 43 and 44 are
With the force of 3, 74 and the acting force based on the compressed air in the supply chamber 32, the pilot compressed air in the working chambers 57, 58 moves upward while exhausting the pilot compressed air to the first illustrated state, and the supply valve parts 45, 46 are supplied. The seats 39 and 40 are seated, and the exhaust valve portions 47 and 48 are
The O-rings 55 and 56 are fitted to the supply holes 35 and 36 to close the supply holes 35 and 36, the supply chamber 32 and the output chamber 33 are cut off, and the output chamber 33 and the exhaust chamber 34 are separated. The pneumatic actuator connected to and connected to the output chamber 33 is operatively controlled by exhausting the compressed air and decreasing the pressure.

With this operation, the supply valves 45, 46 integrally formed of elastic material so as to be elastically deformable are seated on the supply valve seats 39, 40 by the upward movement of the main valves 43, 44, and the supply valve seats 39, 40 are moved. Close the valve to obtain a closed property, and move the main valves 43 and 44 downward to move the exhaust valve
When 7, 48 are seated on the exhaust valve seats 41, 42, the supply valve portions 45, 46
When the back surface 45B opposite to the attachment / detachment surface 45A to the supply valve seats 39, 40 abuts the lid members 53, 54 of the valve body 31, the supply valve portions 45, 46
Is elastically deformed to obtain a buffering action. For this reason, it is possible to eliminate the need for a member for obtaining the obstruction when closing the supply valve seat and a member for obtaining a buffering action when the exhaust valve portion is seated on the exhaust valve seat, so that the number of parts can be reduced. Good closing performance when closing the supply valve seats 39 and 40 and the exhaust valve section 4
It is possible to obtain a buffering action when the seats 7 and 48 are seated on the exhaust valve seats 41 and 42.

In addition, since the supply valve portions 45 and 46 are formed by integrally forming urethane rubber, they can be configured as a single member, and the assembly and production of the main valves 43 and 44 can be facilitated.

In the embodiment, the radial gap H is formed between the supply valve portions 45 and 46 and the valve bodies 49 and 50, but this may not be formed.

〔The invention's effect〕

As described above, the present invention provides a supply chamber for supplying compressed air, an output chamber connected to the pneumatic actuator, and an exhaust chamber for releasing to the atmosphere in the valve body with an interval in the axial direction sequentially, and The output chamber communicates with the supply hole through the supply hole, and the output chamber and the exhaust chamber communicate with each other through the exhaust hole coaxial with the supply hole. The supply valve seat is formed around the supply hole opening of the supply chamber, and around the exhaust hole opening of the exhaust chamber. The supply valve is located in the supply chamber such that the supply valve seat is opened by moving in one direction, the exhaust valve seat is closed, and the supply valve seat is closed by movement in the other direction to open the exhaust valve seat. The supply valve part that opens and closes the supply valve seat by detaching from the seat and the exhaust valve part that is located in the exhaust chamber and detaches from the exhaust valve seat to open and close the exhaust valve seat are integrated with the valve body that penetrates the supply hole and the exhaust hole. The main valve is constructed movably and supplies pilot compressed air to the working chamber formed at the end of the main valve. A pilot valve for operating the main valve by piloting by exhausting pilot compressed air from the working chamber is provided.The supply valve part is formed integrally with an elastic material so as to be elastically deformable. The supply valve seat is opened on the opposite back side and the exhaust valve seat is closed. The main valve can be moved in one direction to abut on the valve body, so the number of parts can be reduced and the supply valve seat can be closed well. It is possible to obtain a sufficient blocking property and a buffering action when the exhaust valve section is seated on the exhaust valve seat.

In addition, since the supply valve portion is integrally formed of an elastic material, the supply valve portion can be formed as a single member, which has an effect of facilitating assembly and production of the main valve.

[Brief description of the drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a pilot operation switching valve, FIG. 2 is an enlarged partial sectional view of a main part of FIG. 1, FIG. 4 is an enlarged partial cross-sectional view of a main part showing an operating state, and FIG. 5 is a vertical cross-sectional view of a pilot operation switching valve showing a conventional example. 31 Valve body, 32 Supply chamber, 33 Output chamber, 34 Exhaust chamber, 35, 36 Supply hole, 37, 38 Exhaust hole, 39, 40
… Supply valve seat, 41, 42 …… Exhaust valve seat, 43, 44 …… Main valve, 4
5, 46: Supply valve part, 45A: Detachable surface, 45B: Back, 4
7, 48 ... exhaust valve section, 49, 50 ... valve body, 57, 58 ... working chamber, 60, 61 ... pilot valve.

Claims (1)

(57) [Claims] 1. A valve body is provided with a supply chamber for supplying compressed air, an output chamber connected to a pneumatic actuator, and an exhaust chamber open to the atmosphere at an interval in the axial direction. And the output chamber and the exhaust chamber communicate with each other by an exhaust hole coaxial with the supply hole. A supply valve seat is formed around the supply hole opening of the supply chamber, and the exhaust valve is formed around the exhaust hole opening of the exhaust chamber. A seat is formed, and the supply valve seat is opened and the exhaust valve seat closed by movement in one direction.The supply valve seat is closed and the exhaust valve seat is opened by movement in the other direction. The supply valve part that opens and closes the supply valve seat and the exhaust valve part that is located in the exhaust chamber and separates from the exhaust valve seat to open and close the exhaust valve seat can be moved integrally with the valve body that penetrates the supply hole and the exhaust hole. Provide the main valve to supply pilot compressed air to the working chamber formed at the end of the main valve A pilot valve for operating the main valve in a pilot manner by exhausting pilot compressed air is provided, and a supply valve portion is integrally formed of an elastic material so as to be elastically deformable, and a rear surface facing a separation surface which is separated from and separated from the supply valve seat. A pilot-operated switching valve which is provided so as to be able to contact the valve body by moving the main valve in one direction by opening the supply valve seat and closing the exhaust valve seat.