JPH0710155Y2 - Coupling device for piping - Google Patents

Description

TECHNICAL FIELD The present invention relates to a joint device for piping.

2. Description of the Related Art Conventionally, a method of connecting a bellows-shaped metal flexible pipe to a gas pipe by using a joint device to branch the gas flow path from the gas pipe arranged along the outer wall of a building such as a house Is taken.

Therefore, in order to fit one end of the flexible tube into the main body of the joint device and engage it, a metal retaining ring that holds the vicinity of one end of the flexible tube is used. Known by the issue. The snap ring is divided in the circumferential direction, and the snap ring is fitted in the joint body while holding the vicinity of one end of the flexible pipe with the snap ring,
The flexible pipe is connected to the joint main body by pushing the retaining ring inside the joint main body by tightening the cap nut that is screwed into the joint main body.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above-described conventional configuration, when the flexible pipe is connected to the joint body, the retaining ring is first set near one end of the flexible pipe outside the joint body, and the flexible state is maintained. Since one end of the pipe is fitted into the joint main body and then the cap nut is screwed into the joint main body, there is a problem that the work at the connection work site takes time. In addition, the retaining ring has a front shape of, for example, a hexagonal shape in order to prevent co-rotation inside the joint main body, and moreover, in order to firmly embrace the flexible pipe inside the joint main body, the retaining ring has a shaft core. Pile of flexible tubes in direction 3
There is a problem in that the length for holding the flexible pipe in the range of about 4 to 4 is required, the retaining ring itself becomes expensive, and the cost of the joint device increases.

The present invention solves such a problem, and an object of the present invention is to improve the connection work efficiency and to provide an inexpensive joint device.

Means for Solving the Problem In order to solve the problem, the present invention provides a cylindrical receiving seat portion at an intermediate position in the hole of a joint body having a hole serving as a fluid flow path inside. A concave portion is formed around the receiving seat portion, a female screw portion is formed on the inner surface of the hole portion located outside the receiving seat portion, and a tip is applied to the end surface of the receiving seat portion inside the hole portion. A ring-shaped packing that wraps the tip of the bellows-shaped flexible tube inserted into the hole so as to come into contact with it from the outside, and a retaining ring that prevents the flexible tube from shrinking and that can be expanded in diameter. A tightening member that is screwed into the female screw part and the tip of which comes into contact with the retaining ring, and a stopper that prevents the packing from being fitted into the recess before tightening by the tightening member is provided in the hole. By tightening the tightening member All the peaks on the tip side of the flexible pipe in the valley where the snap ring fits are crushed by the rake, presses against the end surface of the receiving seat, and the packing is also pushed by the snap ring, causing At the same time when the flexible tube is crushed, it is pressed against the tip of the crushed flexible tube.

Operation With this configuration, when connecting the joint device and the flexible pipe, the flexible pipe is simply pushed into the hole of the joint main body and the tightening member is tightened at the work site. Moreover, the parts themselves are inexpensive, and the cost can be reduced.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a metal joint main body having a hole 2 through which gas passes through in the axial direction. A male screw portion 3 is formed on the outer surface of the length range of / 3. One end of a bellows-shaped metal flexible pipe 4 is inserted into the hole 2 from the other end side in the axial direction of the joint body 1, and the end of the flexible pipe 4 is the shaft of the hole 2 of the joint body 1. It can come into contact with the end surface of the cylindrical receiving seat portion 5 formed at the central portion in the core direction. The receiving seat portion 5 is formed so as to be flush with one end side of the joint body 1 in the axial direction so that the inner diameter thereof is the same as the inner diameter of the hole 2a on the one end side of the joint body 1 in the axial direction. Around the seat portion 5, a hole 2b on the other end side in the axial direction having a diameter larger than the inner diameter of the hole 2a on one end side in the axial direction of the joint body 1 is formed. Therefore, a recess 6 is formed between the outer surface of the receiving seat 5 and the inner surface of the hole 2b. 7
Numerals 8 and 8 are ring-shaped packings and retaining rings made of spring, which are inserted into the hole 2 at the factory, for example, before the insertion of the flexible tube 4, and the packing 7 is inserted before the retaining ring 8. The packing 7 is stopped before the recess 6 by a flat ring-shaped stopper 9 made of a metal plate inserted into the hole 2 before the packing 7.
The stopper 9 is integrally provided with protrusions 10 at the outer peripheral portion and the inner peripheral portion at four locations in the circumferential direction, and
The projecting piece 10 is configured to come into contact with the end surface of the receiving seat portion 5 and the step portion 11 on the outer periphery of the entrance of the recess 6 before this. Thus, the stopper 9 and the packing 7 are inserted into the hole 2 and the retaining ring 8 inserted after the packing 7 is inserted.
Is configured so as to be able to contact the rear end surface of the packing 7. The retaining ring 8 is formed by bending a coiled spring in a ring shape so as to be capable of contracting and expanding its diameter, and both ends thereof are joined to each other. By the way, a female screw portion 12 is formed on the inner surface of the hole 2b within a length range of about 1/3 from the other end side in the axial direction of the joint body 1. Numeral 13 is screwed into the joint body 1 from the other end in the axial direction, and the stopper ring 8 is provided at the tip.
A cylindrical tightening member that pushes the packing 7 and presses the tip of the flexible tube 4 against the end surface of the seat portion 5. The tip of the tightening member 13 has a taper surface 13a that extends outward from the inner surface toward the tip. Are formed. Reference numeral 14 is an O-ring fitted in an annular groove portion 15 formed on the inner surface of the rear end portion of the fastening member 13.

On the other hand, the flexible pipe 4 is covered with a flexible cover 16 made of resin, except for one end inserted into the joint body 1 and the other end inserted into another joint device. ing. The covering cover 16 has the O-ring in a state where one end of the flexible tube 4 is inserted into the joint body 1.
The outer surface is attached to 14 at one end.

In the above structure, the stopper 9, the packing 7, and the retaining ring 8 are inserted in this order inside the joint body 1, and the flexible pipe 4 is inserted into the hole 2 from the other end side in the axial direction of the joint body 1. Insert by pushing in one end. At that time, the retaining ring 8 successively rides over the ridges of the flexible tube 4, the flexible tube 4 gradually enters the hole 2, and the tip of the flexible tube 4 contacts the end surface of the receiving seat 5. At that time, the retaining ring 8 engages with the third trough from the tip of the flexible tube 4. After that, the state in which the tightening member 13 is screwed into the joint body 1 and the tip is brought into contact with the retaining ring 8 is shown in FIG. From the state shown in FIG. 2, the tightening member 13 is screwed and tightened to press the retaining ring 8 inwardly in the axial direction of the joint body 1 by the tapered surface 13a at the tip, whereby the retaining ring 8 is pressed. All the plurality of peaks on the tip side of the flexible pipe 4 in the valley portion where is fitted are crushed and pressed against the end surface of the receiving seat portion 5 to make a metal seal, and the retaining ring 8 seals the packing 7 The packing 7 is also pushed and deforms the protruding piece 10 of the stopper 9 and presses the stopper 9 to press-fit into the recess 6 and press-contact the recess 6, the tip end of the crushed flexible pipe 4 and the retaining ring 8. It is done and a seal is made. Such sealing prevents gas leakage, and the O-ring 14 adheres to the covering cover 16 of the flexible tube 4 to prevent rainwater or the like from entering from the outside.

By the way, in the above-mentioned embodiment, the joint main body 1 having the male screw portion 3 on the outer surface on the one end side in the axial direction is used for description, but the shape of the joint main body 1 is not particularly limited, and one joint main body is not limited. A plurality of female screw portions may be provided in parallel in the section to connect a plurality of flexible pipes at the same time.

As described above, according to the present invention, when the joint device and the flexible pipe are connected, the flexible pipe is simply pushed into the hole of the joint main body at the work site and the tightening member is tightened. Therefore, the work efficiency can be improved, and the parts themselves can be inexpensive, so that the cost can be reduced.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a sectional view when a flexible tube is inserted, and FIG. 3 is a sectional view when a tightening member is tightened. 1 ... Coupling body, 2,2a, 2b ... Hole, 3 ... Male thread, 4 ... Flexible pipe, 5 ... Receiving seat, 6 ... Recess, 7 ... Packing, 8 ... Stop Wheel, 9 ... Stopper, 10 ... Projection piece, 12 ... Female screw part, 13 ... Tightening member, 13a ... Tapered surface.

Claims (1)

[Scope of utility model registration request] 1. A cylindrical receiving seat portion and a recessed portion formed around the receiving seat portion at an intermediate position in the hole portion of a joint main body portion having a hole portion serving as a fluid passage therein. A female screw portion is formed on the inner surface of the hole portion located outside the seat portion, and a bellows-like flexible member is inserted into the hole portion so that the tip end contacts the end surface of the receiving seat portion. A ring-shaped packing for wrapping the tip of the pipe from the outside and a retaining ring for retaining the diameter that can be engaged with the valley of the flexible pipe and that can be reduced in diameter and expanded in diameter are arranged side by side, and the tip is screwed into the female screw portion. Is provided with a tightening member that comes into contact with the snap ring, and a stopper is provided in the hole to prevent the packing from being fitted into the recess before tightening by the tightening member. Flexible valley matching All of the plurality of peaks on the tip side are crushed and pressed against the end surface of the receiving seat, and the packing is also pressed by the retaining ring to be pressed into the recess and at the same time the crushed flexible tube tip A joint device for piping that is configured to make pressure contact.