JPH0738791Y2 - Pipe fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a one-touch fitting suitable for use in a pressure piping system.

[Prior Art] Conventionally, for example, when a pressure fluid supply source and a pressure fluid use device are connected by a hose, a connection part between one end of the hose and the pressure fluid supply source, and the other end of the hose and the pressure fluid use device are connected. One-touch fittings are used for each of the connections. This one-touch fitting is composed of opposing plugs and sockets, each of which has a one-touch attachment / detachment structure, and these plugs and sockets can be quickly and reliably connected / disconnected from each other with one touch.

[Problems to be Solved by the Invention] However, when the conventional pipe joint is used, if the plug and the socket are separated under the condition that there is residual pressure in the hose,
Residual pressure is released into the atmosphere instantaneously, which is dangerous.

In the conventional one-touch fitting, an automatic opening / closing valve is built in at least one of the plug and socket, the automatic opening / closing valve is automatically opened when both are connected, and the automatic opening / closing valve is automatically opened when the two are separated. Some are closed. When using this pipe joint, if the plug and socket are separated when there is residual pressure in the hose, the residual pressure will be trapped by the automatic opening / closing valve and the risk of instantaneous atmospheric release can be avoided. . However, in this case, for example, when a hose containing residual pressure separated from the pressure fluid supply source and the pressure fluid using device is to be wound up for storage, the residual pressure should be gradually released to the atmosphere. , Special depressurizing jig must be prepared.

Japanese Utility Model Publication No. 56-23598 discloses, as a coupler with residual pressure release, "a body attached to one end of a first fluid passage, and a poppet incorporated in this body for closing one end of the first fluid passage, A nose that is attached to one end of the second fluid passage and that fits with the body, pushes the poppet into the body at the time of fitting, and connects the first and second fluid passages to each other, and the rolling element radially extends to the body. And a holding means that is mounted so as to be movable into the groove of the outer periphery of the nose when the body and the nose are fitted together, and a retaining means that is fitted coaxially to the body to prevent radial movement of the rolling element. At the same time, a collar that allows the rolling element to move in the radial direction by axial movement and that separates the nose from the body, and a collar that is provided in the body and that pushes the first fluid passage into the outside air when pushed into the body. A residual pressure release valve for communicating,
An inclined engagement portion which is provided on at least one of the valve and the collar so as to be inclined with respect to the collar axis line and which transmits the moving force of the collar as a pushing force to the body of the residual pressure relief valve by axially moving the collar by a predetermined amount. According to this prior art, the moving force of the collar is transmitted to the valve rod of the residual pressure relief valve by its inclined engagement portion to open the valve and remains in the body. Residual pressure can be released.

However, in the conventional technique described in Japanese Utility Model Publication No. 56-23598, an inclined engaging portion is provided in a part of the collar, and the valve rod is pushed in by the inclined engaging portion to release pressure. There is a point.

Although the head of the valve rod is pushed by the inclined engaging portion of the collar, the valve rod cannot be effectively pushed in because the frictional force between the inclined engaging portion and the valve rod is large, and When the residual pressure is large, the pressure release is incomplete.

It is stated that the valve may be opened by screwing the collar and body when the internal pressure of the body becomes large.
At high pressure, the screwing force becomes excessive and the operability is poor. Also, dust, etc., may enter the threads and cause malfunction.

The slant engagement portion of the collar and the head of the valve stem are rubbed against each other, and both are easily worn, and the pushing of the valve stem becomes incomplete with the lapse of use, resulting in incomplete pressure release.

The collar covers around the residual pressure release port of the residual pressure release valve, and the collar prevents smooth release of residual pressure, and particularly when the releasing fluid is a liquid, the liquid hits the collar and stains the coupler.

INDUSTRIAL APPLICABILITY The present invention is a pipe joint that allows the plug and the socket to be safely separated with one touch after the residual pressure in the pipe is easily released. The pipe joint has good depressurization operability and enables complete and smooth depressurization. The purpose is to

[Means for Solving the Problems] The present invention comprises a plug and a socket facing each other, and each of the plug and the socket is provided with a one-touch attachment / detachment structure, and the plug and the socket are connected / disconnected with each other by one-touch. In a pipe joint that can be provided, a pressure relief device is provided in at least one of a plug and a socket, and the pressure relief device communicates with a discharge port that directly exposes the pipeline of the plug or the socket to the atmospheric space, The pressure relief valve that opens and closes the pressure relief passage, the elastic body that always sets the pressure relief valve in the closing direction, and the operator that can set the pressure relief valve to the open position as necessary,
The operator has a push hole that can move in the axial direction of the pressure relief valve and can rotate around it, and a key hole that can engage with a pin provided on the body of the pressure relief device. The pressure relief valve is held in the closed position by the elastic spring when the side portion of the keyhole of the operator is not locked to the pin,
When the operating element is pushed in and rotated from the above state and the lateral part of the key hole of the operating element is locked to the pin, it is pushed open by the pushing part of the operating element and set to the open position. Is.

[Operation] When separating the plug and socket under the condition that there is residual pressure in the pipe, first set the pressure relief valve to the open position by the operator of the pressure relief device, and then through the pressure relief passage that opens. Therefore, the residual pressure in the pipe can be easily released to the atmosphere. After the air is released, the plug and the socket are separated by one touch by their one-touch attachment / detachment structure. At this time, since the plug and the socket are not accompanied by residual pressure release to the atmosphere, they can be safely separated.

The operator is moved in the axial direction and vertically contacts the pressure relief valve to push it open. Therefore, when the pressure relief valve is pushed open by the operator, the pressure relief valve can be effectively pushed in without causing friction loss and the like, and even when the internal pressure is large, the pressure can be completely released.

The operator has a simple-shaped key hole, and the lateral portion of the key hole is engaged with and disengaged from the pin to selectively hold the pressure relief valve at either the open position or the closed position. Therefore, malfunction of the operator is unlikely to occur, and operability at high pressure is good.

The operator and the depressurizing valve are in vertical contact with each other and are less likely to be worn away from each other, and an operational failure due to the use progress is unlikely to occur.

The outlet of the depressurization passage is installed so as to directly face the atmospheric space, and the depressurization from the outlet to the atmospheric space is smooth, and the discharged fluid does not touch the joint equipment and contaminate them. .

[Embodiment] FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing a plug, FIG. 3 is a front view showing a plug, and FIG. 4 is a schematic view showing a piping system. is there.

As shown in Fig. 1, the pipe joint (one-touch coupler) 10
It consists of opposing plug 11 and socket 12.

The plug 11 is provided with a conduit 14 in a plug body 13, a threaded portion 16 at one end of a hexagonal nut portion 15, and a ball groove 17 and a seal cylinder portion 18 at the other end of the hexagonal nut portion 15.

The socket 12 includes a socket body 19 having a conduit 20, a hexagonal nut portion 21 having an internal thread portion 22 and an O-ring 23, and hexagonal nut portions 21 having balls 24 at a plurality of circumferential positions on the other end side. ing. Further, in the socket 12, a sleeve 25 and a sleeve spring 26 are attached to the outer peripheral portion of the other end of the hexagonal nut portion 21 in the socket body 19. 27 is a stop ring attached to the socket body 19.

That is, in the pipe joint 10, at the time of connection, the sleeve spring 26 is contracted and the sleeve 25 is pulled, and the plug 11
Insert the seal tubular portion 18 of the inside of the socket 12, then return the sleeve 25 by the restoring force of the sleeve spring 26, the ball 24 of the socket 12 side engages with the ball groove 17 of the plug 11,
Connection is completed with one touch. The seal at the time of connection is made by the seal cylinder portion 18 of the plug 11 and the O-ring 23 of the socket 12 being in close contact with each other. On the other hand, at the time of separation, when the sleeve 25 is pulled and the socket 12 is pulled out from the plug 11 as in the case of connection, the balls 24 come out of the ball groove 17 and the separation is completed with one touch.

Thus, in the pipe joint 10, as shown in FIGS. 1 to 3, the pressure relief device 30 is screwed on the hexagonal nut portion 15 of the plug 11. The depressurizing device 30 sets a depressurizing passage 31 that connects the conduit 14 of the plug 11 to the atmospheric space, a depressurizing valve 32 that opens and closes the depressurizing passage 31, and sets the depressurizing valve 32 in a normally closing direction. An elastic spring 33 and an operator 34 that can set the pressure relief valve 32 to the open position as required. 35 is a discharge port that communicates with the pressure release passage 31 and directly faces the atmospheric space,
36 is a support plate for the elastic spring 33.

The operator 34 is a key that can move in the axial direction of the pressure relief valve 32 and can rotate in the direction around the axis, and can be engaged with the pushing portion 37 that comes into contact with the pressure relief valve 32 and the pin 38 provided in the main body 30A. Hole 3
Equipped with 9. The pressure relief valve 32 has a key hole lateral portion 39A of the operator 34.
When it is not locked to the pin 38, it is held in the closed position by the elastic spring 33 (see FIGS. 2 and 3), and the manipulator 34 is pushed in and rotated from the above state and the manipulator 34 is rotated. When the keyhole lateral portion 39A is locked to the pin 38, the pushing portion 37 of the operator 34
It is pushed open by and set to the open position (see FIG. 1). When the pressure relief valve 32 is set to the open position, the plug 11
The residual pressure of the piping system connected to the pipeline 14 of the
35 will be released into the atmosphere.

FIG. 4 is a schematic diagram showing a maintenance piping system of the crude oil transportation piping 40. 41, 42, 43, 44 are high pressure steam supply pipes, high pressure water supply pipes, high pressure air supply pipes, high pressure nitrogen supply pipes, respectively. It is provided. A high-pressure hot water generator 45 is connected to the downstream side of the on-off valves 41A, 42A provided in the high-pressure steam supply pipe 41 and the high-pressure water supply pipe 42. Thus, the open / close valve 40A of the crude oil transport pipe 40, the hot water generator 45, the open / close valve 43A of the high pressure air supply pipe 43, the open / close valve 44A of the high pressure nitrogen supply pipe 44.
The above-mentioned plug 11 is fixed to each of these via the male screw portion 16. On the other hand, the above-mentioned pipes are added to the crude oil transport pipe 40.
41 to 44, there is a hose 46 for selectively connecting the hot water generator 45, and the sockets described above are provided at both ends of the hose 46.
12 is fixed via the female screw portion 22.

That is, the socket 12 at one end of the hose 46 is connected to the crude oil transportation pipe.
Connect to the plug 11 on the 40 side and the socket on the other end of the hose 46
By connecting each pipe 41 to 44 to 12 and the plug 11 on the side of the hot water generator 45, high-pressure steam, high-pressure water to the crude oil transport pipe 40,
Either high-pressure air, high-pressure nitrogen, or high-pressure hot water is supplied, whereby, for example, cleaning of the crude oil transport pipe 40, airtightness test,
Liquid tightness test, residual liquid purge, etc. can be performed.

Next, the operation of the above embodiment will be described.

When using the pipe joint 10, when separating the plug 11 and the socket 12 under the condition where the hose 46 has a residual pressure, first, the pressure relief valve 32 is set to the open position by the operator 34 of the pressure relief device 30, As a result, the residual pressure of the hose 46 can be easily released to the atmosphere through the pressure relief passage 31 that opens. After this atmospheric release, the plug 11 and the socket 12 are separated by one-touch by their one-touch attachment / detachment structure. At this time, since the plug 11 and the socket 12 are not accompanied by residual pressure release into the atmosphere, they can be safely separated.

Further, the manipulator 34 is moved in the axial direction and abuts the pressure relief valve 32 vertically to push the pressure relief valve 32 open. Therefore, when the pressure relief valve 32 is pushed open by the operator 34, the pressure relief valve 32 can be effectively pushed in without causing a friction loss or the like, and the pressure can be completely released even when the internal pressure is large.

Further, the operator 34 has a key hole 39 having a simple shape, and by disengaging the key hole lateral portion 39A from the pin 38, the pressure relief valve 32 can be selectively opened or closed. Hold on. Therefore, malfunction of the operator 34 is unlikely to occur,
Good operability at high pressure.

Further, the operator 34 and the depressurization valve 32 are in vertical contact with each other and are less likely to wear with each other, so that an operation failure due to the use progress is unlikely to occur.

Moreover, the discharge port 35 of the pressure release passage 31 is installed so as to directly face the atmospheric space, and the pressure release from the discharge port 35 to the atmospheric space is smooth, and the discharged fluid touches the joint device to remove them. It doesn't get dirty.

Therefore, the hose 46 including the pipe joint 10 can be safely and reliably used in the piping system and can be immediately wound up after use.

In the implementation of the present invention, the depressurizing device may be provided on the socket side.

[Effects of the Invention] As described above, according to the present invention, in the pipe joint in which the residual pressure in the pipe can be easily released and the plug and the socket can be safely separated with one touch, the pressure release operability can be improved. It is good and can be completely and smoothly depressurized.

[Brief description of drawings]

1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing a plug, FIG. 3 is a front view showing the plug, and FIG. 4 is a schematic view showing a piping system. 10 ... Pipe fitting, 11 ... Plug, 12 ... Socket, 17 ... Ball groove, 24 ... Ball, 25 ... Sleeve, 30 ... Depressurizing device, 31 ...
Pressure relief passage, 32 ... Pressure relief valve, 33 ... Resilient spring, 34 ... Operator, 35 ... Discharge port, 37 ... Pushing part, 38 ... Pin, 39 ... Key hole.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A pipe joint comprising a plug and a socket facing each other, each plug and socket having a one-touch attachment / detachment structure, and the plug and socket can be connected / separated from each other with one-touch. A pressure release device is provided in at least one of the pressure release device and the pressure release device that connects the pressure release device to a discharge port that directly exposes the conduit of the plug or socket to the atmospheric space and the pressure release device that opens and closes the pressure release passage. A pressure relief valve, an elastic body that always sets the pressure relief valve in the closing direction, and an operator that can set the pressure relief valve to the open position as needed. It is equipped with a pusher that can move in the axial direction and can rotate around the axis, and that comes in contact with the pressure relief valve and a key hole that can be engaged with a pin provided in the body of the pressure relief device. Is held in the closed position by the elastic spring when the lateral part of the keyhole of the operator is not locked to the pin, and the lateral part of the keyhole of the operator is pushed and rotated from the above state. The pipe joint is characterized in that when it is locked to the pin, it is pushed open by the pushing portion of the operating element and set to the open position.