JPH0447495Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a residual pressure exhaust valve, and particularly to a residual pressure exhaust valve suitable for use in a pneumatic circuit.

[Background Art] For example, in a pneumatic circuit that uses compressed air pressure to drive a cylinder device, etc., after the supply of compressed air pressure to the cylinder device, etc. is stopped, the remaining air in the downstream piping to which the cylinder device, etc. is connected is removed. Residual pressure exhaust valves are sometimes used for purposes such as exhausting pressure.

As such a residual pressure exhaust valve, for example, an exhaust flow path is provided so as to intersect with a communication portion between an inlet flow path and an outlet flow path that are provided facing each other, and an exhaust flow path is provided in the axial direction of the exhaust flow path. By displacing the poppet fixed to the shaft body in the axial direction, both end surfaces of the poppet can be connected to the main valve seat provided between the inlet flow path and the outlet flow path, the outlet flow path and the exhaust flow, respectively. The exhaust valve seat is configured to alternately come into close contact with the exhaust valve seat provided between the exhaust valve seat and the exhaust valve seat.

Then, by disengaging the poppet from the main valve seat and moving it toward the exhaust valve seat, the inlet flow path and the outlet flow path are brought into communication, and the exhaust valve seat is occluded. When the poppet is moved to the valve seat side and the inlet flow path and outlet flow path are cut off, the poppet is removed from the exhaust valve seat so that the residual pressure on the outlet flow path side is discharged to the outside through the exhaust flow path. A structure with a similar structure can be considered.

However, in the residual pressure exhaust valve having the above structure, when the poppet moves between the main valve seat and the exhaust valve seat to perform a switching operation, the poppet moves between the main valve seat and the exhaust valve seat. It is inevitable that the inlet flow path, outlet flow path, and exhaust flow path will be temporarily in communication with each other, and the compressed air flowing in from the inlet flow path will be lost through the exhaust flow path, causing the compressed air to become compressed. This has the disadvantage that the amount of air consumed is increased more than necessary.

Furthermore, when the poppet is removed from the exhaust valve seat, the residual pressure on the outlet flow path side is rapidly discharged to the outside, which poses a danger.

In order to avoid such drawbacks, the structure of the valve should be changed to
It is also possible to make it into a so-called spool shape, but
The spool type has the drawback that the airtightness is likely to be incomplete when it is closed, and fluid leakage is likely to occur.

[Object of the invention] An object of the invention is to provide a residual pressure exhaust valve that can prevent fluid loss during switching operation.

[Summary of the invention] The invention consists of a main shaft in which an exhaust valve part for opening and closing the outlet flow path and the exhaust flow path is integrally formed, and a main shaft through which the main shaft is inserted to open and close the inlet flow path and the outlet flow path. The main valve part and the main valve part are independently displaceable in the axial direction, and after both the exhaust valve part and the main valve part are closed, the exhaust valve part or the main valve part is made to be able to be displaced independently in the axial direction by displacement of the main shaft in the axial direction. By adopting a structure in which one opening operation is performed, it is possible to avoid simultaneous communication between the inlet flow path, the outlet flow path, and the exhaust flow path during the switching operation, thereby preventing fluid loss during the switching operation. This is to prevent this.

[Embodiment] Fig. 1 is a sectional view of a residual pressure exhaust valve which is an embodiment of the present invention, and Figs. 2 and 3 are sectional views sequentially illustrating its operating state.

Inside the main body 1, an inlet channel 2 and an outlet channel 3 are provided so as to face each other and communicate with each other, and an exhaust channel 4 is provided to intersect with the axial direction of the inlet channel 2 and outlet channel 3. is formed.

Furthermore, a cap 5 is screwed onto the main body 1 at a position facing the exhaust flow path 4.
One end of the main shaft 6 provided through the center of the cap 5 projects outside the cap 5, and the other end is inserted into the small diameter portion 4a of the exhaust passage 4.

In this case, an exhaust valve part A consisting of an enlarged diameter part 6a and an O-ring 6b is integrally provided at the end of the main shaft 6 inserted into the small diameter part 4a, and is opened and closed by displacement of the main shaft 6 in the axial direction. It is a structure in which actions are performed.

Further, the main shaft 6 is provided inside the main body 1.
It is slidably inserted into the main valve part B, which is made up of a holder 7a and a poppet 7b made of rubber or the like, and the main valve part B is biased by the valve spring 8 so that the valve seat 8a
By being in close contact with the holder 7a, communication between the inlet channel 2 and the outlet channel 3 is cut off, and the holder 7a
One end is locked to the flange portion 6c of the main shaft 6, and the main valve portion B resists the biasing force of the valve spring 8 to the valve seat 8a.
The structure is such that the axial displacement of the main shaft 6 is transmitted only in the direction of separation from the main shaft 6, so that the inlet flow path 2 and the outlet flow path 3 are communicated with each other.

An O-ring 6d and an O-ring 6e are attached to each insertion portion of the main shaft 6, main valve portion B, and cap 5 to maintain airtightness of each insertion portion.

A guide pin 9 is attached to the end of the main shaft 6 that projects outside the cap 5 in a direction intersecting the axis of the main shaft 6.
is inserted.

Both ends of the guide pin 9 have a pair of spiral guide grooves 10 carved rotationally symmetrically into the wall surface of a cylindrical sleeve 10 attached to the main body 1.
a and the guide groove 10b.

This sleeve 10 is made of, for example, resin, and has a structure that reduces sliding resistance with the guide pin 9 made of metal or the like.

Further, the sleeve 10 is fixed to the main body 1 via a taper pin 10a.

Further, the guide pin 9 has a groove 11a and a groove 11b (not shown only in FIGS. 2 and 3) that are parallel to the axial direction of the main shaft 6 and are formed in a handle 11 that is rotatably attached to the main body 1. ).

Then, the handle 11 is acted upon from the outside.
The rotational force about the main shaft 6 is transmitted to the guide pin 9 through the grooves 11a and 11b, and the guide pin 9 is connected to the spiral guide grooves 10a and 10b.
By moving the main shaft 6 along the main shaft 6, an axial displacement is generated in the main shaft 6.

A pair of protrusions 11c and 11d formed on the outer periphery of the handle 11 are screwed with a fixing screw 12a and a fixing screw 12b, respectively, and the tips thereof are fitted into the grooves of the main body 1. A handle 11 is rotatably locked to the main body 1.

The operation of this embodiment will be explained below.

First, as shown in FIG.
are located at the ends of the guide grooves 10a and 10b, and when the main valve section B is in an open state, the exhaust flow path 4 is in a closed state by the exhaust valve section A, and is not connected to, for example, a compressed air pressure source. Fluid such as compressed air flowing into the inlet flow path 2 is supplied to a cylinder device (not shown) or the like through the outlet flow path 3.

Next, when the handle 11 is rotated in a predetermined direction, the guide pin 9 fixed to the main shaft 6 moves into the guide groove 1.
0a and 10b, and to which the guide pin 9 is fixed, the main shaft 6 is displaced in the direction of entering the inside of the main body 1 while making a spiral movement, and the main shaft 6, which is fixed to the flange portion 6c of the main shaft 6, The valve portion B follows the displacement of the main shaft 6 by the biasing force of the valve spring 8 and comes into close contact with the valve seat 8a, and the inlet flow path 2 and the outlet flow path 3 are cut off.

This state is shown in FIG. 2, and at this time, the guide pin 9 is located approximately in the middle of the paths of the guide grooves 10a and 10b, and the exhaust valve part A as well as the main valve part B are maintained in a closed state.

Furthermore, when the handle 11 is rotated in the same direction, only the main shaft 6 is further displaced with the main valve part B closed by the biasing force of the valve spring 8, and the valve formed at the end of the main shaft 6 is The exhaust valve part A is the exhaust flow path 4.
The guide pin 9 reaches the ends of the guide grooves 10a and 10b, and the residual pressure in the outlet passage 3 is released to the outside through the exhaust passage 4, as shown in FIG. The residual pressure is discharged, and the closing operation of the residual pressure exhaust valve is completed.

Conversely, in the case of an opening operation, by rotating the handle 11 in a predetermined direction in the state shown in FIG. As shown in the figure,
The main valve part B and the exhaust valve part A are closed at the same time, and then the main valve part B is locked to the flange part 6c, and the main valve part B is moved together with the main shaft 6 against the biasing force of the valve spring 8. It is displaced and separated from the valve material 8a, and the opening operation is completed in the state shown in FIG. 1.

In this way, in this embodiment, the main shaft 6 into which the exhaust valve part A is integrally formed and the main valve part B through which the main shaft 6 is inserted are configured to be movable independently, and the exhaust valve part A and the main valve part Since either the exhaust valve section A or the main valve section B is opened after both the exhaust valve section A and the main valve section B are closed, when switching between opening and closing of the main valve section B, the exhaust valve section A
The main valve part B is simultaneously opened, and the inlet flow path 2, outlet flow path 3, and exhaust flow path 4 are prevented from being in communication with each other temporarily, and the compressed air supplied to the inlet flow path 2, etc. The fluid is prevented from being lost to the outside through the exhaust flow path 4.

Furthermore, the opening operation of the exhaust valve portion A is caused by the exhaust flow path 4
The enlarged diameter part 6a of the main shaft 6 is inserted into the small diameter part 4a of
Since the structure is such that the exhaust gas is gradually separated from the small diameter portion 4a, the residual pressure in the outlet flow path 3 is not suddenly discharged to the exhaust flow path 4.
It's safe.

Moreover, since the main valve part B is constituted by the poppet 7b, the closing operation of the main valve part B is reliably performed, and leakage of fluid from the inlet channel 2 to the outlet channel 3 is prevented.

Also, a guide groove 10a into which the guide pin 9 is fitted
and 10b are formed in the sleeve 10 provided separately from the handle 11, which simplifies the structure of the handle 11, and by making the sleeve 10 of resin or the like, the guide pin 9 and The sliding resistance of handle 1 is reduced.
1. The operation becomes smooth.

It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit thereof.

[Effects] (1) An exhaust flow path is provided together with the inlet flow path and the outlet flow path, and when the flow of fluid from the inlet flow path to the outlet flow path is cut off, the residual pressure on the outlet flow path side is reduced. A residual pressure exhaust valve that exhausts air through the exhaust flow path, and a main shaft integrally formed with an exhaust valve portion that opens and closes the outlet flow path and the exhaust flow path;
After the main shaft is inserted, the main valve part that opens and closes the inlet flow path and the outlet flow path can be independently displaced in the axial direction, and both the exhaust valve part and the main valve part are closed. Since the structure is such that one of the exhaust valve section or the main valve section is opened by displacement of the main shaft in the axial direction, the exhaust valve section and the main valve section are opened at the same time when switching between opening and closing of the main valve section. This prevents the inlet flow path from being in communication with the outlet flow path and the exhaust flow path, and fluid such as compressed air supplied to the inlet flow path is lost to the outside through the exhaust flow path. Fluid losses due to this are prevented.

(2) Since the main valve part is a poppet, the closing operation of the main valve part is performed reliably, and leakage of fluid from the inlet flow path to the outlet flow path is prevented.

(3) Since the guide groove into which the guide pin is fitted is formed in a sleeve provided separately from the handle, the structure of the handle is simplified, and the sleeve can be made of resin or the like. This reduces sliding resistance with the guide pin,
The handle can be operated smoothly.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a residual pressure exhaust valve which is an embodiment of the present invention, and FIGS. 2 and 3 are sectional views sequentially illustrating its operating state. DESCRIPTION OF SYMBOLS 1... Main body, 2... Inlet channel, 3... Outlet channel, 4... Exhaust channel, 4a... Small diameter part, 5... Cap, 6... Main shaft, 6a... Expanded diameter part, 6b ……
O-ring, 6c...flange part, 6d, 6e...
O-ring, 7a...Holder, 7b...Poppet,
8... Valve spring, 8a... Valve seat, 9... Guide pin, 10... Sleeve, 10a, 10b... Guide groove, 11... Handle, 11a, 11b... Groove, 11c, 11d... Projection , 12a, 12b
...Fixing screw, A...Exhaust valve part, B...Main valve part.

Claims (1)

[Claims for Utility Model Registration] (1) An exhaust flow path is provided together with the inlet flow path and the outlet flow path, and when the flow of fluid from the inlet flow path to the outlet flow path is interrupted, the outlet flow The residual pressure exhaust valve discharges residual pressure on the road side through the exhaust flow path, the main shaft having an integrally formed exhaust valve portion for opening and closing the outlet passage and the exhaust flow path, and the main shaft inserted through the residual pressure exhaust valve. A main valve section that opens and closes the inlet flow path and the outlet flow path is made independently displaceable in the axial direction, and after both the exhaust valve section and the main valve section are closed, the main valve section A residual pressure exhaust valve characterized in that one of the exhaust valve section and the main valve section is opened by displacement in an axial direction. (2) The residual pressure exhaust according to claim 1, wherein the main valve portion is a poppet, and the poppet is biased by a spring so as to be able to be displaced independently of the main shaft. valve.