JPH0410466Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a coupling device such as a union socket used for water pipes and the like.

[Conventional technology]

In conventional water piping, union sockets such as the one shown in FIG. 6 are often used to connect faucets and the like, and to connect water meters and synthetic resin pipes.

In a conventional union socket, a union socket B is rotatably attached to a socket A, and this union nut B is screwed into a threaded part C of a water meter or faucet, etc., and the socket A and the threaded part C are connected. It has a structure in which a water meter, faucet, etc. and a synthetic resin pipe, etc. are connected by crimping a plate-shaped gasket d between the end faces.

[Problem that the invention aims to solve] However, in the conventional union socket, socket a
When tightening the union nut b with the packing d interposed between the end faces of the threaded part c and the threaded part c, the center O' of the packing d will shift downward by δ with respect to the center O of the socket a and the threaded part c due to the weight of the packing d. As a result, as shown in Fig. 7, a part of the flow path e is blocked by a part of the seal d, which increases the flow resistance and, if the gap of the seal d is large, the sealing effect decreases. There were problems such as water leakage.

This invention was made with the aim of improving the above-mentioned problems, and is intended to provide a coupling device in which the packing does not shift during connection.

[Means and actions to solve the problem]

In order to achieve the above object, this invention forms a joint body by a socket and a nut engaged with one end of the socket, and enlarges the inner diameter of the inner periphery of the nut-side end of the socket. to form a stepped portion, and this stepped portion includes a ring-shaped seal portion,
The cylindrical part of the packing, which is a thin cylindrical part protruding from the inner circumferential end face of the seal part, is fitted into the packing, and the end face of the seal part is in contact with the end face of the socket, and the pipe body and When connecting a water faucet, water meter, etc., the gasket will not shift due to its own weight, and since the cylindrical portion does not protrude from the inner peripheral surface of the socket, there is no risk of foreign objects becoming clogged.

〔Example〕

An embodiment of this invention will be described in detail with reference to the drawings.

In the figure, 1 is a joint body, which is composed of a socket 2 and a nut 3.

The socket 2 has a flange 2a formed at one end, and a flange 3a of a nut 3 inserted from the other end can be locked onto the flange 2a. It is possible to connect synthetic resin pipes, etc.

Further, the nut 3 has a groove 3b formed on its inner circumferential surface, and the flange 2a of the socket 2 is housed in the groove 3b, and a water meter is provided on the inner circumference of the end opposite to the flange portion 3a. 5 and the threaded part 5 of the faucet 6
A female thread 3c that can be screwed freely is formed in a and 6a.

On the other hand, 4 is a packing made of an elastic material such as rubber, and includes an annular seal portion 4a whose inner and outer peripheral surfaces are recessed in an arc shape, and a thin seal portion 4a that protrudes from the inner peripheral portion of one end of this seal portion 4a. The cylindrical portion 4b is the flange 2 of the socket 2.
As shown in FIG. 1, it is fitted into a stepped portion 2b formed by enlarging the inner diameter on the inner circumferential surface of the a-side end.

Next, to explain the operation, the above-mentioned coupling device is used, for example, when connecting between the faucet 6 and the pipe body 7 or between the water meter 5 and the pipe body 7 of the water pipe as shown in Fig. 3. When using it, first, attach the gasket 4 to the flange 2a side of the socket 2 in advance, connect one end of the socket 2 to the pipe body 7 using adhesive, and then connect the faucet 6 or water meter. 5 threaded parts 6a, 5a
Screw together the nut 3 and tighten the nut 3 as shown in FIG.

At this time, since the cylindrical part 4b of the packing 4 is fitted into the socket 2 in advance, the center of the packing 4 will not shift with respect to the center of the socket 2 and the threaded parts 5a, 6a, and the Second
The seal portion 4a having the cross-sectional shape shown in the figure is attached to the socket 2 and the threaded portion 5a as the nut 3 is tightened.
6a is crimped at the end face, and the arc-shaped recess swells outward as shown in FIG. Problems such as protrusion and interference with the female thread 3c of the nut 3 and damage will not occur.

[Effect of idea]

As detailed above, this idea is based on the fact that the gasket has a cylindrical part, and this cylindrical part is attached to the socket in advance, so that the pipe body can be connected to a faucet, water meter, etc. using the joint body. The packing will not shift due to its own weight.

This prevents problems such as part of the seal from clogging the flow path and increasing water flow resistance, and also prevents the seal from shifting, which may reduce the sealing effect and cause water leakage. There is no such thing. In addition, since the cylindrical part of the packing is made thin so that it fits into the stepped part formed on the inner peripheral surface of the socket,
The inner peripheral surfaces of the cylindrical portion and the socket are approximately on the same plane.

This prevents the cylindrical portion from increasing the flow path resistance of the pipe, and also prevents foreign objects from getting caught in the cylindrical portion, thereby eliminating the risk of causing clogging.

In addition, if recesses are provided in advance on the inner and outer peripheries of the seal, even if the seal deforms when the seal is tightened, the outer periphery will protrude toward the nut and interfere with the female thread, causing damage to the seal. There is no risk of this happening, and it can be easily replaced if the sealing effectiveness deteriorates.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, FIG. 1 is a cross-sectional view, FIG. 2 is an enlarged view of the packing, FIGS. 3 to 5 are action explanatory views, and FIGS. 6 and 7 are explanations of the conventional method. It is a diagram. 1 is a joint body, 2 is a socket, 2a is a flange, 3 is a nut, 4 is a packing, 4a is a seal portion, and 4b is a cylindrical portion.

Claims (1)

[Scope of utility model registration request] A joint body 1 is formed by a socket 2 and a nut 3 engaged with one end of the socket 2, and a stepped portion 2b is formed on the inner periphery of the end of the socket 2 on the nut 2 side by enlarging the inner diameter. The stepped portion 2b includes an annular seal portion 4a and a thin cylindrical portion 4 protruding from the inner circumferential end surface of the seal portion 4a.
The cylindrical portion 4b of the gasket 4 made of b is fitted, and the seal portion 4a is attached to the end surface of the socket 2.
A joint device made by abutting the end faces of.