JPH01238791A - Connection structure of pipe - Google Patents

Abstract

PURPOSE:To surely prevent the release of a second pipe body by insertedly housing the bush having a chuck part in the nut threadedly attached to a first pipe body with the second pipe body to be insertedly connected made to penetrate into the first pipe body. CONSTITUTION:A bush 4 provided with the chuck part 42, having a beheaded conical state and in which the outer peripheral surface is formed on the taper surface facing the clamping part 21 of a nut 2, is housed in the nut 2 penetrated and inserted in a second pipe body 3. This enables the release of the body 3 to be surely prevented since the outer peripheral surface of the body 3 is clampedly held with the inner diameter of the part 42 of the bush 4 contracted by the clamping of the nut 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a connection structure for pipes, for example, a connection structure for a faucet leg and a water supply pipe.

(Prior art) Conventionally, as a pipe connection structure, the Utility Model Application Publication No. 59-1 shown in Fig. 5 was used.
The one disclosed in Japanese Patent No. 81389 is known.

To explain what is shown in FIG. 9, the first tube body (1),
A nut (2) screwed onto the first tube body, a second tube body (3) inserted into the first tube body (1) through the nut (2), and each housed in the nut (2). The locking claw part (5) of the nut (2) is released through the locking ring (5) when the nut (2') is tightened.
The retaining ring (6) is held between the retaining ring (6) and the first tube body (1), and the second @ rest (3 ) to prevent the second tube body (3) from falling off.

(Problems to be Solved by the Invention) In the conventional pipe connection structure described above, the second pipe is held only by the spring force of the claws provided on the inner periphery of the retaining ring. There was a problem in that the prevention of falling off was not perfect, and if the nut was tightened too much, the gasket would be completely crushed, so it would no longer function as a gasket and, of course, would be impossible to reuse.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe connection structure that can reliably prevent the second pipe body from falling off and prevent over-tightening of the nut.

(Means for Solving the Problems) In order to achieve the above object, the pipe connecting device of the present invention includes a first pipe body, a nut screwed onto the outer periphery of the first pipe body, and a first pipe penetrating through the nut. A second tube body inserted into the first tube body, and a bush and a packing that are respectively fitted into a nut and tightly attached to the second tube body. An attached section is provided. The bush is provided with a chuck part formed in one tapered surface corresponding to the tightening part of the nut on one axial side and having a slit in the axial direction, and a cylindrical packing housing part on the other side. A packing is fitted and housed in the packing receiving portion, and the packing is formed so that its axial length is longer than the axial length of the packing receiving portion.

Further, it is desirable to provide a small protrusion projecting inward on the inner circumferential surface of the chuck portion.

(Function) In the pipe connection structure configured as described above, when the nut is tightened, the bushing is pushed and moved in the direction of the first pipe body, compressing the bushing and bulging inward, causing the inner peripheral surface of the bush to be pushed and moved. is crimped onto the outer peripheral surface of the second tube. When the bushing's packing accommodation portion hits the first tube end portion, the nut cannot be tightened any further.

on the other hand. The chuck portion of the bush is deformed by the tightening of the tightening portion as the nut is tightened to reduce the inner diameter, and the outer circumferential surface of the second tube body is held in a balanced manner. Further, the small protrusions on the inner circumference of the chuck part bite into the second outer circumferential surface of the body.

(Example) An example will be described with reference to the drawings. In Fig. 1, the first pipe body (1) consists of the legs of a hot and cold water mixing faucet (A), and a male screw (11) is provided on the outer peripheral surface. A nut (2) is screwed on, and a second pipe body (3) made of a copper water supply pipe is inserted inside the nut (2) by passing through the nut (2).

The nut (2) is formed into a cap nut shape with a latching claw part (22) at one end in the axial direction, and the mouth edge part is expanded inward at the inner opening edge of the latching claw part (22). A tightening portion (21) is provided by forming a tapered surface.

Inside each nut (2) is a ring-shaped bush (4).
and Patsukin (5) are accommodated and deployed.

The bush (4) is provided with a truncated conical chuck part (42) whose outer peripheral surface is tapered to correspond to the tightening part (21) of the nut (2) on one side in the axial direction, and on the other side. A cylindrical packing housing part (43) is provided continuously at the base end of the chuck part (42).

The chuck part (42) has a slit (41) extending in the axial direction from the tip thereof, and a plurality of small protrusions (45) which protrude in an annular shape along the circumferential direction are provided on the inner circumferential surface of the chuck part (42).

Further, the packing housing part (43) has an inner diameter larger than the inner diameter of the chuck part (42) via the stepped part (44), and the packing (5) is fitted and accommodated therein.

The bush (4) is inserted into the nut (2) with the chuck part (42) first, and the chuck part (42) is inserted into the nut (2).
Fit into the tightening part (21) of 2).

The packing part (5) is the packing part (4) of the bushing (4).
3) having an outer diameter that is substantially the same as the inner diameter and an inner diameter that is substantially the same as the outer diameter of the second tube body (3), and having an axial length larger than that of the packing housing portion (43); It is inserted and fitted into the gasket accommodating portion (43) and abutted against and latched to the stepped portion (44) via the slip washer (7).

Therefore, in the normal state before the nut (2) is tightened, the packing (5) partially protrudes outward from the open end of the packing receiving portion (43) of the bushing (4), as shown in FIG.

By tightening the nut (2), the bush (4) is pressed toward the first tube body (1) as shown in FIG. (1), and the chuck part (42) is attached to the nut (2).
) enters the tightening part (21) in a wedge shape and the part (42) is narrowed to a reduced diameter, strongly clamping the second tube body (3) and releasing the small protrusion on the inner periphery of the chuck part (42). (45) holds it in an equilibrium state.

Also, the bushing (5) is the first tube body (1) of the bushing (4).
As it moves to the side, it is crushed by the step part (44) of the bushing (4) and the end part of the first tube (1), swells inward, and is pressed against the outer peripheral surface of the second tube (3).

(Effects of the Invention) Since the present invention is configured as described above, it produces the effects described below.

In the pipe connecting device according to claim 1, the nut is inserted into the first pipe to be inserted and connected to the first pipe, and the nut is screwed to the first pipe, and the nut is tightened on one side in the axial direction. Since a bushing having a chuck part that is wedge-shaped and deforms to reduce the inner diameter when pressed is fitted and housed, tightening the nut reduces the inner diameter of the chuck part of the bushing and tightens the outer circumferential surface of the second tubular body. Clamping, 11tll of the second pipe body
R can be reliably prevented.

In addition, the bushing is provided with a packing accommodating section that is continuous with the chuck section, and the packing that is longer in the axial direction is accommodated in this packing accommodating section, so that the packing is crushed when the nut is tightened. It bulges inward and is crimped to the second tube to reliably prevent water leakage and to further ensure that the second tube does not fall when removed. If so, there will be no further crushing of the packing, and there will be less damage to the packing. Therefore, it is possible to reuse the packing.

Furthermore, in the pipe connection structure of claim 2, as the chuck portion reduces in diameter and clamps the second pipe body, the small protrusion weighs the second pipe body and becomes a biting shape, thereby tightening the second pipe body. The hold on the body becomes even stronger.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view obtained by applying the pipe connection structure of the present invention to a hot water mixer faucet, Fig. 2 is an enlarged sectional view of the main part, and Fig. 3
The figure is an enlarged sectional view of the same and shows the state before tightening the nut. FIG. 4 is a partially cutaway perspective view of the bushing, and FIG. 5 is a sectional view showing an example of a conventional pipe connection structure. 1: First tube 2: Nut 3: Second tube 4: Push 5: Packing 21: Tightening part

Claims (2)

[Claims] 1. a first tube; a nut screwed onto the outer periphery of the first tube;
A second pipe body is inserted into the first pipe body through the nut, and a bush and a packing are respectively fitted inside the nut and tightly attached to the second pipe body. A tapered tightening part is provided, and the bush is provided with a chuck part on one side in the axial direction that is formed in a tapered one-sided shape corresponding to the tightening part of the nut and has a slit in the axial direction, and on the other side. A pipe connection structure characterized in that a cylindrical packing accommodating part is provided, a packing is fitted and housed in the packing accommodating part, and the axial length of the packing is formed to be larger than the axial length of the packing accommodating part. 2. 2. The pipe connection structure according to claim 1, wherein the bush has a small protrusion on the inner circumferential surface of the chuck portion.