JPH0424232Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a detachment prevention pipe joint.

BACKGROUND ART A conventional separation prevention pipe joint as shown in FIG. 7 has been proposed. That is, the socket 11 formed at the end of one tube, the socket 12 formed at the end of the other pipe and fitted externally to the socket 11, and the socket 11 and the socket that fit together. A gasket 14 having an annular bulge 13 interposed between the gasket 12 and the gasket 12.
The packing 14 is housed in an annular socket groove 15 formed on the inner peripheral surface of the socket 12. A locking metal fitting 16 is fixed to the gasket 14, and as shown in FIG. By protruding and locking, the tube was prevented from coming off. This pipe joint provides a large detachment prevention force, and the joining operation is as simple as inserting the socket 11 into the socket 12 as shown in FIGS. 7 and 8.

Problems to be Solved by the Invention However, according to this type of pipe joint, only one bulge 13 is formed in the annular packing 14, so that the pipe joint may be stretched apart due to an earthquake, for example. As shown in FIG. 10, when the bulging part 13 of the packing 14 is located in the insertion slot 17, there is a gap between the bulge 13 and the outer peripheral surface of the socket 11 forming the insertion slot 17. There is a risk that the sealing performance will be impaired due to the formation of gaps between the pipes, and fluid in the pipe may leak through the insertion groove 17, especially when the pipe joint is bent.

The present invention solves the above problems, and has a large detachment prevention force, easy joining operation,
Moreover, it is an object of the present invention to provide a detachment prevention pipe joint that does not lose its sealing performance even if it expands, contracts, or bends due to an earthquake or the like.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a receptacle formed at the end of one tube, and a receptacle formed at the end of the other tube that fits externally into the receptacle. an annular socket groove formed on the inner circumferential surface of the socket and having a stepped portion on the tube end side of the opening edge; An annular packing that can seal the gap between the opening and the socket; and a locking member that is fixed to the side of the packing on the opening side of the socket and protrudes in a radial direction from an inner peripheral part corresponding to the outer peripheral surface of the socket. a locking fitting having a stopper formed thereon and a protrusion capable of engaging with the stepped portion of the socket groove; and a locking fitting capable of engaging with the locking fitting and provided in an annular shape on the outer circumferential surface of the socket. The tube is provided with an insertion groove, and two bulges arranged in the tube axis direction are formed in the packing.

Function In the above configuration, when the socket is inserted into the socket, the locking metal fitting comes into contact with the peripheral edge of the end of the socket at its locking part, and resists the elastic force of the packing as the socket is inserted. The socket is pushed into the socket groove, allowing the socket to pass through. During this time, the outer circumferential surface of the socket contacts the bulge of the packing and slides, closing the gap between the socket and socket in the mated state. Seal. Next, when the joined socket and socket move apart in the direction of the tube axis, the locking part of the locking fitting, which is biased by the elastic force of the packing, protrudes into the socket groove and engages. At the same time, the protrusion of the locking fitting engages with the step of the socket groove. In this state, the locking fitting locks the insertion port in the direction of separation to prevent it from coming off. By the way, there are cases where the insertion port and socket connected in this way move a certain amount in the direction of separation in the direction of the tube axis, resulting in a state where one of the bulging portions of the gasket is located within the insertion groove. In this case, a gap may be formed between the bulge and the outer peripheral surface of the socket forming the socket groove. However, since the packing has two bulges formed in the tube axis direction, the other bulge comes into close contact with the outer circumferential surface of the insertion port.
This maintains the sealing performance of the pipe joint, and even if the pipe joint bends in this state, water inside the pipe will not leak through the insertion groove.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings. In FIGS. 1 to 6, the end of one tube is formed into a socket 1, and the end of the other tube is formed into a socket 2 which fits externally into the socket 1. An annular socket groove 3 is formed on the inner circumferential surface of this socket 2, and a step 4 is provided at the opening edge of this socket groove 3 over the entire circumference on the pipe end side. There is. and,
An annular gasket 5 formed of a rubber ring capable of sealing the gap between the socket 1 and the socket 2 is arranged in the socket groove 3. This packing 5 has socket 2 and socket 1.
Two bulges 6A and 6B are formed that are aligned in the tube axis direction in order to maintain sealing performance by being pressed between them. In addition, a heel portion 7 is formed on the further side of the bulging portion 6A on the socket opening side of the packing 5 and is lined up in the tube axis direction, and on the side of this heel portion 7,
As shown in FIG. 6, the locking metal fittings 8, which are divided into 12 parts in the circumferential direction of the socket groove 3, are fixed to the side walls of the socket groove 3 in a position that allows them to come into contact with each other. This locking metal fitting 8 has a protrusion 9 that can be engaged with the step 4 of the socket groove 3 on the side corresponding to the side wall of the socket groove 3, and also has a protrusion 9 that can be engaged with the step 4 of the socket groove 3.
It has an engaging portion in which an inclined surface corresponding to the insertion direction of the socket 1 is formed on an inner circumferential surface corresponding to the outer circumferential surface of. The outer peripheral surface of the socket 1 has an annular socket groove 1.
0 is formed. The insertion slot 10 has a locking fitting 8
It is formed by a guide surface that slopes corresponding to the slope of the locking fitting 8, and a locking surface that comes into contact with an end surface formed on the side of the locking fitting 8 on the back side of the socket.

Hereinafter, the effects of the above configuration will be explained. First, when inserting the socket 1 into the socket 2, the locking fitting 8 comes into contact with the outer circumferential surface of the tip of the socket 1 on the inclined surface of the inner peripheral surface, and as the socket 1 is inserted, the fitting 5 is pressed It is pushed into the socket groove 3 against the elastic force and allows the socket 1 to pass through as shown in FIG. When the insertion slot 10 passes in the insertion direction of the insertion slot 1, the locking fitting 8 is urged by the elastic force of the packing 5 and protrudes into the insertion slot 10.
It is pushed into the socket groove 3 again by the guide surface 0. During this time, the outer circumferential surface of the socket 1 slides in contact with the inner circumferential surfaces of the bulges 6A and 6B of the packing 5, and in the joined state shown in FIG.
A and 6B slide into contact with the tube body side of the socket 1 to seal the gap between the socket 2 and the socket 1. Next, if the joined socket 1 and socket 2 move apart in the direction of the tube axis due to an earthquake or the like, the locking metal is biased by the elastic force of the packing 5 as shown in FIG. 8 is the insertion slot 1
0, and engages with the insertion groove 10 by bringing the end surface on the back side of the socket into contact with the locking surface of the insertion groove 10. Then, when the socket 1 and the socket 2 try to separate further, the locking metal fitting 8 swings in the direction of being pulled out from the socket groove 3, and the protrusion 9 engages with the stepped part 4 of the socket groove 3. be done. In this state, the locking fitting 8 locks the insertion port 1 in the direction of separation to prevent it from coming off. At this time, since the protrusion 9 of the locking metal fitting 8 is engaged with the step part 4 of the socket groove 3, the locking metal fitting 8 does not twist, and the locking metal fitting 8 extends over almost the entire circumference. Because the stress generated by the load in the separation direction is reduced,
The detachment prevention force of the locking metal fitting 8 becomes large. In addition, when the socket 1 and socket 2 joined as described above move in the direction of separating from each other in the tube axis direction, the fourth
As shown in the figure and FIG. 5, there are cases where the seal 5 moves a certain amount and stops at a position where the inner peripheral side of one of the bulging parts 6A or 6B of the gasket 5 is fitted into the insertion slot 10. In this case, a gap may be formed between one of the bulges 6A or 6B that fits into the socket groove 10 and the outer peripheral surface of the socket 1 forming the socket groove 10. However, since the packing 5 has two bulges 6A and 6B arranged in the tube axis direction, the other bulge 6B or 6A comes into close contact with the outer circumferential surface of the insertion port 1, which improves the sealing performance. It is maintained.

Effects of the invention As described above, according to the invention, it is possible to obtain a pipe joint that has a large detachment prevention force and is easy to join, and also has two bulges aligned in the direction of the pipe axis on the packing. Therefore, even if the pipe joint expands, contracts, or bends, the sealing performance is reliably maintained, and as a result, fluid inside the pipe is prevented from leaking.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
5 to 5 are operational diagrams of FIG. 1, FIG. 6 is a layout diagram of a locking fitting in an embodiment of the present invention, FIG. 7 is a configuration diagram showing a conventional example, and FIGS. 8 to 10 are FIG. 7 is an action diagram of FIG. 1...Socket, 2...Socket, 3...Socket groove, 4...
... Stepped portion, 5... Packing, 6A, 6B... Bulging portion, 7... Heel portion, 8... Locking metal fitting, 9... Protrusion, 10... Inlet groove.

Claims (1)

[Scope of utility model registration request] A socket formed at the end of one tube, a socket formed at the end of the other pipe and externally fitted into the socket, and an opening edge formed on the inner peripheral surface of the socket. an annular socket groove with a step formed on the pipe end side of the part;
An annular packing that is placed in the socket groove and can seal the gap between the socket and the socket, and a ring-shaped packing that is fixed to the side of the socket on the socket opening side and corresponds to the outer circumferential surface of the socket. a locking fitting having a locking portion projecting in the radial direction on an inner peripheral portion thereof and having a protrusion that can be engaged with the stepped portion of the socket groove; an annular insertion groove provided on the outer circumferential surface of the insertion port, and the packing has two bulges lined up in the tube axis direction to be pressed between the socket and the insertion port to maintain sealing performance. A detachment prevention pipe joint characterized by forming a part.