JPH0647189Y2 - Pilot operated switching valve - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention operates the main valve by pilot operation by supplying pilot compressed air to the working chamber by the pilot valve or exhausting pilot compressed air from the working chamber. The present invention relates to a pilot operation switching valve that cuts off communication between a supply chamber that supplies compressed air, an output chamber that is connected to a pneumatic actuator, and an exhaust chamber that opens to the atmosphere.

[Conventional technology]

Conventionally, this kind of pilot operated switching valve is open to the atmosphere and a supply chamber 1 having a supply port P for supplying compressed air and an output chamber 2 having an output port A connected to a pneumatic actuator as shown in FIG. The exhaust chamber 3 having the exhaust port E is provided in the valve main body 4 at intervals in the axial direction in order to connect the supply chamber 1 and the output chamber 2 with supply holes 5 and 6, and
The output chamber 2 and the exhaust chamber 3 communicate with each other through exhaust holes 7 and 8, which are located in the supply chamber 1 and are attached to and detached from the supply valve seats 9 and 10.
Exhaust valve section for opening and closing the supply valve sections 11 and 12 and the exhaust valve seats 13 and 14 located in the exhaust chamber 3 for opening and closing the exhaust valve seats 13 and 14
Valve body which penetrates 15 and 16 through supply holes 5 and 6 and exhaust holes 7 and 8
The main valves 19 and 20 are formed by having the valves 17 and 18, and the main valves 19 and 20 are valve bodies.
Pilot valve of FIG. 2 has pistons 23 and 24 integrally formed with exhaust valve portions 15 and 16 slidably on the valve body 4 so as to define working chambers 21 and 22 at the ends of 17 and 18, respectively. In the non-energized state of 25 and 26, the pilot compressed air in the working chambers 21 and 22 is exhausted, the main valves 19 and 20 are moved upward in the drawing by the force of the springs 27 and 28, and the supply valve portions 11 and 12 are It sits 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 portion 15,
16 is separated from the exhaust valve seats 13 and 14 to communicate 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. When the pilot valves 25 and 26 are energized from the state shown in the drawing, pilot compressed air is supplied to the working chambers 21 and 22, and the working force based on this pilot compressed air acts on the pistons 23 and 24 and slides downward in the drawing. , The main valves 19, 20 are pressed by the pistons 23, 24
27, 28 Move downward in the figure against the force to supply valve parts 11, 12
Is separated from the supply valve seats 9 and 10 to communicate between the supply chamber 1 and the output chamber 2, and the exhaust valve portions 15 and 16 are seated on the exhaust valve seats 13 and 14 so that the output chamber 2 and the exhaust chamber 3 are connected to each other. Is shut off and compressed air in the supply chamber 1 is supplied to the pneumatic actuator connected to the output chamber 2 to control the operation.

[Problems that Invention devises to solve]

However, in order to reduce the weight, the valve body 4 is made of an aluminum material, and the pistons 23, 24 are also made of an aluminum material, and the ridges of the pistons 23, 24 are formed by repeatedly operating the main valves 19, 20. Since the sliding portion of the valve body 4 is twisted at the portion, the sliding portion of the piston 23, 24 of the valve body 4 becomes worn and becomes a rough surface, and the seal members 29, 30 provided on the pistons 23, 24 are The problem is that the abrasion powder generated by abrasion is caught or damaged by rubbing on a rough surface, the pilot compressed air in the working chambers 21 and 22 leaks to the exhaust chamber 3, and good valve operation cannot be obtained for a long period of time. there were.

The present invention solves such a problem by significantly reducing the wear of the sliding parts of the pistons of the valve body and preventing the damage of the seal member arranged at the sliding parts of the valve body and the pistons. The present invention also provides a pilot operated switching valve capable of obtaining good valve operation for a long period of time.

[Means for solving problems]

Therefore, according to the present invention, a supply chamber for supplying compressed air, an output chamber connected to a pneumatic actuator, and an exhaust chamber open to the atmosphere are sequentially provided in the valve body with a gap in the axial direction. The chambers are connected by two supply holes arranged in parallel, and the output chamber and the exhaust chamber are communicated by two exhaust holes coaxial with the supply hole, and a supply valve seat is provided around each supply hole opening of the supply chamber. The exhaust valve seat is formed around each exhaust hole opening of the exhaust chamber, and the exhaust valve seat is arranged in the supply chamber and is attached to and detached from each supply valve seat to open and close each supply valve seat. Two exhaust valve parts that are arranged and attached to and detached from each exhaust valve seat to open and close each exhaust valve seat, and two valves formed of stainless steel that penetrate through each supply hole and each exhaust hole and are axially movable. Two main valves are constructed from the body, and each main valve moves in one direction to open the supply valve seat and close the exhaust valve seat. The supply valve section and the exhaust valve section are provided so as to be locked to the valve body so that the supply valve seat is closed and the exhaust valve seat is opened by moving in the direction, and one end of the valve body is slidably supported on the valve body. In addition, the other end of the valve body has a piston made of a resin material that is slidable on the valve main body so as to define and form a working chamber, and supplies pilot compressed air to each working chamber or each working chamber. There are two pilot valves for pilot operation of each main valve by exhausting pilot compressed air, and seal members at sliding points between the valve body and each piston to prevent leak of pilot compressed air in each working chamber. In the valve body, the portion where each piston slides is formed of an aluminum material and the portion where each valve body slides is formed of a resin material.

[Action]

In this structure, the sliding portion between the valve body and each piston is the sliding between the aluminum material and the resin material. For this reason,
Since the resin material that forms each piston is softer than the aluminum material that forms the point where each piston of the valve body slides,
It is possible to significantly reduce the wear of the parts where the pistons of the valve body slide, and to prevent damage to the seal member that is installed at the sliding parts of the valve body and the pistons, and to obtain good valve operation over a long period of time. it can.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 31 is a main body member made of an aluminum material, and a supply chamber having a supply port P for supplying compressed air.
32 and an output chamber 33 having an output port A connected to a pneumatic actuator and an exhaust chamber having an exhaust port E open to the atmosphere
34 are sequentially provided in the interior with a space in the axial direction, and the supply chamber 32
And the output chamber 33 are connected by two supply holes 35 and 36 arranged in parallel, and the output chamber 33 and the exhaust chamber 34 are connected to each other by the supply holes 35 and 36.
The two exhaust holes 37 and 38, which are coaxial with each other and have a diameter larger than that of the supply holes 35 and 36, are communicated with each other. 39 and 40 are body members 31
Polyacetal (JI
(Refer to SK6900) It is a lid member made of resin material, and each supply hole
35, 36 and the exhaust holes 37, 38 are coaxially screwed to the lower portion of the main body member 31, and the main body member 31 forms a valve main body 41. 42 and 43 are supply valve seats formed around the openings of the supply holes 35 and 36 of the supply chamber 32, and 44 and 45 are exhaust valve seats formed around the openings of the exhaust holes 37 and 38 of the exhaust chamber 34. 46 and 47 are two main valves arranged in parallel in the valve body 41 so as to be movable in the axial direction.
Placed in 32 and attached to and detached from supply valve seats 42, 43.
Supply valve parts 48 and 49 for opening and closing 43, exhaust valve parts 50 and 51 arranged in the exhaust chamber 34 for opening and closing the exhaust valve seats 44 and 45 to open and close, and supply holes 35. , 36 and exhaust holes 37, 38 that are axially movable and made of stainless steel
It consists of 2, 53. Then, the main valves 46 and 47 are moved upward and the supply valve portions 48 and 49 are shown.
Closes the supply valve seats 42, 43, and the exhaust valve parts 50, 51 are exhaust valve seats 44,
The valve element 52, so that the supply valve portions 48, 49 open the supply valve seats 42, 43 and the exhaust valve portions 50, 51 close the exhaust valve seats 44, 45 by opening 45 and moving downward in the direction as one direction. Supply valve portions 48 and 49 are disposed axially below the exhaust valve portion 53 and exhaust valve portions 50 and 51 are disposed axially above the exhaust valve portions 50 and 51, respectively. Further, the main valves 46 and 47 are the valve bodies 5
Axial lower end portions of 2, 53 are lid members 39, 4 constituting a valve body 41.
It is slidably and airtightly supported on 0, and the working chamber 5 is installed on the upper end in the axial direction.
Body member 3 that constitutes the valve body 41 so as to define 4 and 55
1 has slidable pistons 56 and 57. The pistons 56 and 57 are made of the same polyacetal resin material as the lid members 39 and 40, and seal members 58 and 59 are provided at sliding points with the main body member 31, and pilot compressed air in the working chambers 54 and 55 is provided. Are not leaking into the exhaust chamber 34. 60 and 61 are supply holes
Supply holes 35, which are arranged on the shafts of the valve bodies 52, 53 penetrating 35, 36,
O-ring fitted to 36 seals the inner circumference of supply holes 35 and 36 even if supply valve sections 48 and 49 are separated from supply valve seats 42 and 43 by downward movement of main valves 46 and 47. The contact between the supply chamber 32 and the output chamber 33 is shut off, and the main valves 46, 47 are moved further downward, so that the supply holes 35, 36 are provided before the exhaust valve portions 50, 51 are seated on the exhaust valve seats 44, 45.
The supply chamber 32 and the output chamber 33 are separated from each other so as to communicate with each other. Reference numeral 62 is a pilot valve main body disposed above the main body member 31, 63 and 64 are pilot valves for pilot-operating the main valves 46 and 47 provided in the pilot valve main body 62, and are provided in the supply chamber 32 via the pilot compressed air passage 77. With the pilot supply paths 65 and 66 connected and supplying pilot compressed air, the pilot output paths 67 and 68 connected to the working chambers 54 and 55, and the pilot exhaust paths 69 and 70 for releasing to the atmosphere, the non-energized state shown. Then, the movable iron cores 71 and 72 are moved downward by the forces of the springs 73 and 74 to close the pilot supply passages 65 and 66 and communicate between the pilot output passages 67 and 68 and the pilot exhaust passages 69 and 70, and the working chambers 54 and 55. The pilot compressed air is exhausted to move the main valves 46 and 47 upwards by the force of springs 75 and 76, or the movable iron cores 71 and 72 are attracted against the forces of springs 73 and 74 and move upwards when energized. Then close the pilot exhaust paths 69, 70 and the pilot output paths 67, 68 The pilot compressed air to the working chambers 54 and 55 by communicating between the supply channels 65 and 66, and the main valves 46 and 47 to the working chambers 54 and 55 by the acting force based on the pilot compressed air.
It tries to move downward against the force.

Next, the operation of this configuration will be described.

The state of FIG. 1 shows the non-energized state of the pilot valves 63 and 64, and the pilot compressed air in the working chambers 54 and 55 is exhausted through the pilot output passages 67 and 68 and the pilot exhaust passages 69 and 70, 46 and 47 are moved upward by the forces of springs 75 and 76 and the action of compressed air in the supply chamber 32, and the supply valve section
48 and 49 are seated on the supply valve seats 42 and 43 to close the supply valve seats 42 and 43, and the exhaust valve parts 50 and 51 are separated from the exhaust valve seats 44 and 45 to open the exhaust valve seats 44 and 45, The O-rings 60 and 61 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 shut off, and the output chamber 33 and the exhaust chamber 34 communicate with each other, and the output chamber 33 Compressed air from the pneumatic actuator connected to is exhausted. From this state, when the pilot valves 63, 64 are energized, the pilot supply paths 65, 66 and the pilot output paths 67, 68 are in communication, the pilot output paths 67, 68 and the pilot exhaust paths 69, 70 are shut off, and the supply chamber Part of 32 compressed air is pilot compressed air from pilot compressed air passage 77 Pilot supply passage
65, 66, working chambers 54, 55 via pilot output paths 67, 68
Is supplied to the main valve 4 and the acting force based on the pilot compressed air acts on the pistons 56 and 57 and slides downward in the drawing.
6 and 47 are pressed by pistons 56 and 57 to move downward in the drawing against the forces of springs 75 and 76, and supply valve portions 48 and 49 are separated from supply valve seats 42 and 43, and supply valve seat 42 , 43, and exhaust valve
The exhaust valve seats 44 and 45 are seated on the exhaust valve seats 44 and 45, and the exhaust valve seats 44 and 45 are closed.
Exhaust valve parts 50, 51 by moving further downward after further separating
Before being seated on the exhaust valve seats 44 and 45, they are separated from the supply holes 35 and 36 and open the supply holes 35 and 36 so that the supply chamber 32 and the output chamber 33 communicate with each other and the output chamber 33 and the exhaust chamber 34 are shut off The compressed air in the supply chamber 32 is supplied to the pneumatic actuator connected to the output chamber 33, and the operation of the pneumatic actuator is controlled. When the pilot valves 63 and 64 are de-energized from this state, the state returns to the state shown in FIG. 1, the pilot supply paths 65 and 66 and the pilot output paths 67 and 68 are cut off, and the pilot output paths 67 and 68 and the pilot output paths 67 and 68 are disconnected. The exhaust passages 69 and 70 are communicated with each other, and the main valves 46 and 47 move upward while exhausting the pilot compressed air in the working chambers 54 and 55 by the springs 75 and 76 and the acting force based on the compressed air in the supply chamber 32. After moving, the supply valve parts 48 and 49 are seated on the supply valve seats 42 and 43, the exhaust valve parts 50 and 51 are separated from the exhaust valve seats 44 and 45, and the O-rings 60 and 61 are moved.
Fits into the supply holes 35 and 36 and closes the supply holes 35 and 36,
32 and the output chamber 33 are cut off, the output chamber 33 and the non-air chamber 34 communicate with each other, and compressed air is exhausted from the pneumatic actuator connected to the output chamber 33 so that the pressure is lowered and the operation is controlled.

By such an operation, the sliding portion between the main body member 31 and the pistons 56, 57 that form the valve main body 41 is the sliding of the aluminum material and the resin material, and each piston 56 is made of the aluminum material forming the main body member 31, Since the resin material forming 57 is soft, the wear of the parts where the pistons 56, 57 of the main body member 31 slide can be greatly reduced, and the pistons 56, 57 are installed in the sliding parts of the main body member 31 with the main body member 31. It is possible to prevent damage to the seal members 58 and 59, and to obtain good valve operation for a long period of time. And
Each piston 56, 57 is formed of a polyacetal resin material and has a swelling property, and expands even if it is worn by sliding with the main body member 31 by including the water content contained in the compressed air. At the same time, good sliding with the main body member 31 can be obtained by the self-lubricating action.

Further, the main valves 46 and 47 pivotally support the lower end portions of the main valves 52 and 53 in the axial direction to the respective lid members 39 and 40 and the upper end portions in the axial direction of the respective pistons 56 and 57.
Since it is slidable to the main body member 31, it can be supported at both ends, and can be satisfactorily operated even if the acting force based on the compressed air acts eccentrically. Further, since the valve bodies 52, 53 and the lid members 39, 40 are slidable between the stainless material and the resin material, even if the moisture contained in the compressed air adheres to the sliding parts, the sliding parts do not move. It is possible to prevent the occurrence of electrolytic corrosion. Furthermore, since each valve element 52, 53 is made of a stainless material, the strength can be improved and rust can be prevented even if the moisture contained in the compressed air adheres.

Now, the main body member 31 forming the valve main body 41 is formed of an aluminum material, the pistons 56, 57 that slide with the main body member 31 are formed of a resin material, and the lid members 39, 40 forming the valve main body 41 are formed. In the pilot operated switching valve of the embodiment shown in FIG. 1 in which the valve bodies 52 and 53 slidably supported on the lid members 39 and 40 are formed from stainless steel material, the compressed air used is The pressure was 5 kgf / cm ² , and the lubricating oil was not mixed, and when repeatedly operated under this condition, there was no problem even after continuing 17.2 million times.

However, the valve body 4 is made of an aluminum material, the pistons 23 and 24 that slide with the valve body 4 are made of an aluminum material, and the valve bodies 17 and 18 are not pivotally supported on the valve body 4 as shown in FIG. When the pilot operated switching valve was repeatedly operated using the above-mentioned compressed air, the valve body 4 and piston moved 780,000 times.
The sliding parts with 23 and 24 were worn out and malfunction occurred.

[Effect of device]

As described above, according to the present invention, the supply chamber for supplying compressed air, the output chamber connected to the pneumatic actuator, and the exhaust chamber open to the atmosphere are sequentially provided in the valve body with a gap in the axial direction between the supply chamber and the supply chamber. The output chambers are connected by two supply holes arranged in parallel, the output chamber and the exhaust chamber are connected by two exhaust holes coaxial with the supply holes, and a supply valve seat is provided around each supply hole opening of the supply chamber. And an exhaust chamber that forms an exhaust valve seat around each exhaust hole opening of the exhaust chamber and that is disposed in the supply chamber and is attached to and detached from each supply valve seat to open and close each supply valve seat and the exhaust chamber. And two exhaust valve parts that are attached to and detached from each exhaust valve seat to open and close each exhaust valve seat, two exhaust valve parts that penetrate through each supply hole and each exhaust hole, and are movable in the axial direction. Two main valves are constructed from the valve body, and each main valve moves in one direction to open the supply valve seat and close the exhaust valve seat. The supply valve part and the exhaust valve part are provided so as to be locked to the valve body so that the supply valve seat is closed and the exhaust valve seat is opened by moving in the other direction, and one end of the valve body is slidably attached to the valve body. It has a piston made of a resin material that is slidable on the valve body so as to partition and form working chambers at the other end of the valve body, and supplies pilot compressed air to each working chamber Two pilot valves for pilot-operating each main valve by exhausting pilot compressed air from the chamber are provided, and seals are made at sliding points between the valve body and each piston to prevent pilot compressed air from leaking from each working chamber. The parts where the pistons slide on the valve body are made of aluminum, and the parts where the valve slides are made of resin. Wear on the valve body and each piston Prevent damage to the disposed the sealing member on the sliding location, it is possible to obtain an excellent valve operation over a long period of time.

Also, since each main valve has one end of each valve body slidably supported on the valve body and the other end slidably on the valve body by each piston, both ends can be supported and compressed air Even if the acting force based on it acts eccentrically, it can operate well. Furthermore, since each valve element and valve body slide between stainless steel and resin material, even if the water contained in the compressed air adheres to the sliding location, the occurrence of electrolytic corrosion at the sliding location is prevented. can do. Furthermore, since each valve element is made of a stainless material, it has the effect of improving the strength and preventing rust even if moisture contained in the compressed air adheres.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a pilot operation switching valve showing an embodiment of the present invention, and FIG. 2 is a vertical sectional view of a pilot operation switching valve showing a conventional example. 32 ... Supply chamber, 33 ... Output chamber, 34 ... Exhaust chamber, 35, 36 ...
… Supply hole, 37, 38 …… Exhaust hole, 41 …… Valve body, 42, 43…
… Supply valve seat, 44,45 …… Exhaust valve seat, 46,47 …… Main valve, 4
8, 49 …… Supply valve section, 50, 51 …… Exhaust valve section, 52,53 ……
Valve body, 54, 55 ... Working chamber, 56, 57 ... Piston, 63, 64
...... Pilot valve.

Claims (1)

[Scope of utility model registration request] 1. A supply chamber for supplying compressed air, an output chamber connected to a pneumatic actuator, and an exhaust chamber open to the atmosphere are sequentially provided in the valve body with a gap in the axial direction, and between the supply chamber and the output chamber. Are connected by two supply holes arranged in parallel, and the output chamber and the exhaust chamber are connected by two exhaust holes coaxial with the supply hole, and a supply valve seat is formed around each supply hole opening of the supply chamber. Along with each exhaust hole opening of the exhaust chamber to form an exhaust valve seat,
Two supply valve parts arranged in the supply chamber and attached to and separated from each supply valve seat to open and close each supply valve seat and two supply valve parts placed in the exhaust chamber and attached to and separated from each exhaust valve seat to open and close each exhaust valve seat 2 Two main valves are made up of two exhaust valves, two supply holes, and two valve bodies made of stainless steel that penetrate each exhaust hole and are movable in the axial direction. Each main valve is unidirectional. The supply valve portion and the exhaust valve portion are locked to the valve body so that the supply valve seat is opened and the exhaust valve seat is closed by the movement of
One end of the valve body is slidably supported on the valve body, and the other end of the valve body has a piston made of a resin material that is slidable on the valve body so as to separately define working chambers. , Two pilot valves for pilot operation of each main valve by supplying pilot compressed air to each working chamber and exhausting pilot compressed air from each working chamber are provided, and pilot compressed air in each working chamber leaks. A seal member is placed at the sliding point between the valve body and each piston so that the piston body slides on the valve body is made of aluminum and the valve body slides on the resin material. Pilot operated switching valve.