JPH0341173Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is attached to a P port individual spacer,
The present invention relates to a residual pressure exhaust valve that exhausts the residual pressure of an actuator.

[Prior Art] FIG. 5 is a circuit diagram showing an example of a conventional pneumatic circuit.

In this circuit, pressurized air from a pressure source 1 passes through a filter with a drain 3, a pressure reducing valve 5, a switching valve 7 that operates as a residual pressure exhaust valve, is supplied to a manifold 9, and is directed toward the direction attached to the manifold 9. Pneumatic cylinders 15, 17 via control valves 11, 13
to drive.

Further, after passing through the filter 3, some of the pressurized air does not pass through the pressure reducing valve 5, and a residual pressure exhaust valve 19,
It passes through the P port individual spacer 21 attached to the manifold 9, and the P port individual spacer 21
The pneumatic cylinder 25 is driven through a directional control valve 23 attached to the directional control valve 23 .

The pneumatic cylinders 15, 17, 25 are communicated via directional control valves 11, 13, 23 to silencers 27, 29 attached to the manifold 9.

In the air circuit as described above, when performing maintenance or repair of valves, pneumatic cylinders, piping, etc., it is necessary to release the residual pressure in the pneumatic cylinders 15, 17, 25 for work safety. A residual pressure exhaust valve 7 that relieves the residual pressure of the pneumatic cylinders 15 and 17 that operate at low pressure, and a residual pressure exhaust valve 19 that relieves the residual pressure of the pneumatic cylinder 25 that operates at high pressure are provided.

[Problems to be solved by the invention] As mentioned above, conventionally, the residual pressure exhaust valve 19 is connected by piping between the downstream of the filter 3 and the P port individual spacer 21, which increases the number of piping man-hours and requires installation. This led to an increase in space.

[Means for solving the problems] The present invention aims to solve the above problems, and its gist is to provide a body that can slide in the axial direction into the through hole in the sleeve. A first bottomed hole having a pressure port is formed in the axial direction of the body from one end of the body, and a second bottomed hole having an operating port is formed in the axial direction of the body from the other end of the body. , further forming an attachment part at the other end of the body, and forming communication holes from the bottoms of the first bottomed hole and the second bottomed hole of the body in the outer circumferential direction of the body, so that the sleeve and the body are connected to each other. The outer circumference of the body and the inner circumference of the sleeve are connected to and separated from one end of the outer circumference of the body and one end of the inner circumference of the sleeve by sliding relative to each other, thereby forming a first passage that communicates and blocks communication between both communication holes. The compressed air from the operating port is released to the atmosphere through a communication hole formed on the second bottomed hole side at a position of the body and sleeve that blocks the first passage, and At a position where the body and the sleeve communicate with each other, one end of the outer periphery of the body and one end of the inner periphery of the sleeve come into contact with each other, thereby forming a second passage that is isolated from the atmosphere. It is located in the residual pressure exhaust valve formed in between.

[Operations and effects of the invention] In the residual pressure exhaust valve of the invention, the first passage communicates with the sleeve and the body by sliding relative to each other, and when the second passage is blocked, the above pressure is removed. The pressurized air supplied from the port passes through the first bottomed hole, the communication hole provided in the first bottomed hole, the first passage, the communication hole provided in the second bottomed hole, and the second bottomed hole. It passes through the bottomed hole and is supplied to equipment such as the operating cylinder from the operating port.

When the sleeve and the body slide relative to each other and the first passage is blocked, the second passage communicates with the atmosphere and the pressure applied to the operating port is
It passes through the second bottomed hole, the communication hole provided in the second bottomed hole, and the second passage to be opened to the atmosphere.

The residual pressure exhaust valve of the present invention as described above has a mounting portion formed at the other end of the body and is small in size, so it can be directly connected to the connection port of the conventional P port individual spacer. There is no need to install and fix it in the middle of piping. Therefore, it is possible to reduce the number of piping steps such as piping between the connection port of the P port individual spacer and the residual pressure exhaust valve, and to reduce the space for installing the residual pressure exhaust valve.

Furthermore, the residual pressure can be exhausted by a simple operation of moving the sleeve in the axial direction of the body, improving operability.

[Example] An example of the present invention will be described with reference to the drawings. The present invention is not limited to this, but includes various embodiments without departing from the gist thereof.

Fig. 1 is a longitudinal sectional view of the residual pressure exhaust valve of this embodiment, Fig. 2 is a sectional view taken along the line A-A shown in Fig. 1, and Fig. 3 is a plan view of the residual pressure exhaust valve of this embodiment. The figure shows. Further, FIG. 4 shows a circuit when the residual pressure exhaust valve of this embodiment is used in the conventional pneumatic circuit shown in FIG. 5.

In FIG. 1, 30 is a residual pressure exhaust valve of this embodiment, which has a pressure port 32 connected to an air pressure source at one end and an operating port 34 for supplying pressurized air to other equipment at the other end. It is composed of a body 36 and a sleeve 38 in which the body 36 is fitted into a through hole 37.

The body 36 includes a first bottomed hole 40 bored in the body axial direction from the pressure port 32 side, and an operating port 3
A second bottomed hole 4 drilled from the 4 side in the axial direction of the body.
2. four communication holes 44 provided from the bottom of the first bottomed hole 40 toward the outer circumference of the body 36; four communication holes 46 provided from the bottom of the second bottomed hole 42 toward the outer circumference of the body 36; A first groove portion 48 that is annularly provided on the outer circumferential portion of the body 36, communicates with the communication hole 44, and has a taper that widens toward the outer circumferential surface as shown in FIG.
Similarly, a second groove 50 is provided in an annular shape on the outer circumferential surface of the body 36 and communicates with the communication hole 46, and has a taper that widens toward the outer circumferential surface as shown in FIG. port 3
a small-diameter protrusion 52 that is tapered toward the fourth side and has a male thread; a hexagonal head 54 formed on the pressure port 32 side of the body 36;
A female screw portion 56 provided on the pressure port 32 side of the bottomed hole 40, an annular first protrusion 57 formed between the first groove portion 48 and the second groove portion 50, and a second groove portion 50.
An annular second protrusion 5 formed on the protrusion 52 side of the
8. An annular O-ring 59 held in the outer circumferential groove of the first protruding part 57, an annular O-ring 60 held in the outer circumferential groove of the second protruding part 58, and a head 54 of the first groove part 48 on the outer circumferential surface of the body. O-ring 6 installed near the side
It has 2. Furthermore, the body 36
A guide groove 64, on which the tip of a pin 63 driven into the hole 8 slides and guides the body 36 in the axial direction, is provided between the O-ring 62 and the head 50, and forms part of a detent mechanism to be described later. It has two parallel annular grooves 65 and 66.

On the other hand, the sleeve 38 is provided with an annular groove 70 provided on its inner wall surface as shown in FIG. 1, and two ball insertion holes 72 and 74 extending radially through the sleeve 38 as shown in FIG.

Balls 78 and 80 are inserted into the ball insertion holes 72 and 74 of the sleeve 38, respectively, and the balls 78 and 80 are held by an annular spring 82 fitted around the outer periphery of the sleeve 38. Furthermore, the annular spring 82 is attached to the name plate 8 shown in FIG.
4 to the sleeve 38.

Said parallel annular grooves 64, 66, balls 78, 8
0. The annular spring 82 constitutes a detent mechanism, and when the balls 78 and 80 fit into either of the parallel annular grooves 64 and 66, the sleeve 38
The relative position between the body 36 and the body 36 is determined.

FIG. 4 shows an example of how this residual pressure exhaust valve 30 is used. In FIG. ports, P, A, B, R connected to the directional control valve 23
The ports No. 1 and R2 are provided with a tapered female screw portion 92 that widens toward the opening direction connected to the piping from the pressure supply source. Also, 94 is the manifold 9
This is a gasket provided between the P port individual spacer 90 and the P port individual spacer 90. The present residual pressure exhaust valve 30 has a protruding portion 52 that is connected to the female screw portion 9 of the P port individual spacer 90.
2 and is fixed.

When the residual pressure exhaust valve 30 is in the position where the sleeve 38 is moved to the right with respect to the body 36 as shown in FIG. The annular groove 70 and the second groove part 50 of the body 36 communicate with each other to form the first groove.
The pressurized air is supplied to the pressure port 32 through the first bottomed hole 40 of the body 36, the communication hole 44, the first passage, and the communication hole 4 of the body 36.
6. Pass through the second bottomed hole 42 and open the operating port 34
is supplied to the P port individual spacer 90. At this time, the space between the sleeve 38 and the body 36 is
It is hermetically sealed by rings 60 and 62.

Further, when the residual pressure exhaust valve 30 is in the position where the sleeve 38 is moved to the left with respect to the body 36 as shown in FIG. The pressurized air supplied to the pressure port 32 does not reach the actuation port 34 because the sleeve 38 sealed in the first groove 48 closes off the first passage.
On the other hand, the second groove portion 50 of the body 36 and the sleeve 38
Since the annular groove 70 of the body 36 and the atmosphere side communicate with each other to form a second passage, the air pressure applied to the operating port 34 flows through the second bottomed hole 42 of the body 36, the communication hole 46, and the second passage. It passes through and is opened to the atmosphere.

As described above, the present residual pressure exhaust valve 30 configured as described above can be connected by simply screwing and fixing its protruding portion 52 into the female threaded portion 92 of the P port individual spacer 90, and can be connected to No need to install and fix. Therefore, the installation space is reduced,
Piping man-hours can be reduced. Further, the residual pressure can be easily released by simply sliding the sleeve 38 relative to the body 36.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of one embodiment of the residual pressure exhaust valve of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a plan view of the residual pressure exhaust valve, and Fig. 4. is a pneumatic circuit diagram including the residual pressure exhaust valve, and FIG. 5 is a pneumatic circuit diagram using a conventional residual pressure exhaust valve. 30...Residual pressure exhaust valve, 32...Pressure port, 3
4... Operating port, 34, 36... Body, 37
...Through hole, 38...Sleeve, 40, 42...
First and second bottomed holes, 44, 46... communicating hole, 70
...Annular groove.

Claims (1)

[Claims for Utility Model Registration] A body that is slidable in the axial direction is fitted into a through hole in the sleeve, and a first bottomed hole having a pressure port is formed in the axial direction of the body from one end of the body. A second bottomed hole having an operating port is formed from the other end of the body in the axial direction of the body, and an attachment portion is further formed at the other end of the body, and the first bottomed hole and the second bottomed hole of the body are formed at the other end of the body. A communication hole is formed from the bottom of the hole in the direction of the outer circumference of the body, and when the sleeve and the body slide relative to each other, one end of the outer circumference of the body and one end of the inner circumference of the sleeve are attached and separated, and both communication holes are formed. A first passage is formed between the outer periphery of the body and the inner periphery of the sleeve, and a first passage is formed between the outer periphery of the body and the inner periphery of the sleeve, and a second passage is formed on the side of the second bottomed hole at a position between the body and the sleeve that blocks the first passage. The compressed air from the operating port is released to the atmosphere through the provided communication hole, and one outer end of the body and one inner end of the sleeve are in contact with each other at a position where the body and the sleeve communicate with each other through the first passage. A residual pressure exhaust valve in which a second passage isolated from the atmosphere is formed between the outer circumference of the body and the inner circumference of the sleeve.