JP3211091B2 - Pipe fitting and assembly method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint and a method for assembling the same.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a pipe joint to which the present invention is applied.

This pipe joint comprises a tubular joint member (1), two tightening sleeves (ferrules) (2) (3) and a nut (4).
FIG. 2 shows the assembled state.

An outward flange (1a) is formed on the outer periphery of an intermediate portion of the joint member (1), and screws (5)
(6) are formed respectively. Large diameter part (1b) with a slightly larger inner diameter than the left part on the inner periphery on the right end side of the joint member (1)
Is formed, and a tapered surface (1c) inclined rightward inward is formed on the inner periphery of the right end.

[0005] Inside the large diameter portion (1b) of the joint member (1), a pipe is provided.
(7) is inserted from the right side, and a first tightening sleeve (2) and a second tightening sleeve (3) are fitted in order from the left around a pipe (7) projecting rightward from the joint member (1).

The outer peripheral surface (2a) of the first sleeve (2) is a taper surface slightly inclined leftward, and a taper surface (2b) inclined rightward inward is formed on the inner periphery of the right end. Then, the left portion of the first sleeve (2) enters the inside of the tapered surface (1c) of the joint member (1), and the outer peripheral surface (2a) is in close contact with the tapered surface (1c).

[0007] A tapered surface (3a) inclined leftward is formed on the outer periphery of the left end of the second sleeve (3). An outward flange (3b) is formed on the outer periphery of the right end of the second sleeve (3), and the right end surface (3c) is a tapered surface slightly inclined outward. Then, the tapered surface (3a) of the second sleeve (3)
Are in close contact with the tapered surface (2b) of the first sleeve (2).

[0008] An inward flange is formed on the inner periphery of the right end of the nut (4).
(4a) is formed, and this flange (4a) is
It fits around the tube (7) just to the right of the sleeve (3), and inside the nut (4) on the left-hand side, the second sleeve (3), the first sleeve (2) and the right end of the coupling member (1). Side part is inserted.

The left side surface of the flange (4a) of the nut (4) is slightly inclined inward, and this surface is
Close to the right end face (3c) of (3).

A female screw (8) is provided on the inner periphery on the left end side of the nut (4).
Is formed on the right side of the joint member (1).
(6) is screwed.

By tightening the nut (4), the two sleeves (2) and (3) are connected to the joint member (1) and the flange of the nut (4).
(4a), whereby the two sleeves (2) and (3) are tightened, and the pipe (7) is fixed to the joint member (1).

[0012] In the conventional pipe joint, even before assembly, 2
The two sleeves (2), (3) are separated from each other.

[0013]

The above-mentioned pipe joint has two nuts (2) and (3) sandwiched between a joint member (1) and a flange (4a) of the nut (4). 4) The joint member
It is shipped in the normal assembled state with the screw (1) installed, and once disassembled at the site where it is actually used, it is assembled together with the pipe (7).

However, when assembling a pipe joint in a place where the working environment is not always good, such as a site, the positions and orientations of the sleeves (2) and (3) may be incorrectly assembled. In particular, the orientation of the second sleeve (3) is often mistaken. If the pipe joint is incorrectly assembled in this manner, the performance of the joint cannot be sufficiently exhibited, which may cause fluid leakage or the like.

An object of the present invention is to solve the above problems,
An object of the present invention is to provide a pipe joint which is less likely to be mistaken during assembly and a method of assembling the same.

[0016]

SUMMARY OF THE INVENTION A pipe joint according to the present invention comprises a tubular joint member into which a tube is inserted from one end, two clamping sleeves fitted around a tube protruding from one end of the joint member, and A nut for tightening the two tightening sleeves and fixing the pipe to the joint member;
Tapered surface on one sleeve and other sleeve
The taper surface provided in the
Ri, the above two clamping sleeve before assembly
The tapered surfaces are joined to each other with a force enough to separate them by a torsional force when tightening the nut.

Before assembling, one of the two fastening sleeves joined to each other may be joined to the corresponding portion of the nut with such a force that the two sleeves are separated by a torsional force when tightening the nut.

The method for assembling a pipe joint according to the present invention includes a tubular joint member into which a tube is inserted from one end, two clamping sleeves fitted around a tube protruding from one end of the joint member, and these two clamps. A method for assembling a pipe joint comprising a nut for tightening a sleeve to fix a pipe to a joint member, wherein the taper provided on one sleeve is provided.
Surface and the tapered surface provided on the other sleeve are in close contact
Have been made as the above said two clamping sleeve
The tapered surfaces are brought into close contact with each other, and they are joined to each other with a force enough to separate them by the torsion force when tightening the nut. The two tightening sleeves thus joined are fitted around the pipe,
It is characterized by being tightened with a nut.

In some cases, one of the two fastening sleeves joined to each other is joined to a corresponding portion of the nut with a force enough to separate the torsion force when the nut is fastened.

[0020]

Since the two tightening sleeves are joined to each other with a force enough to separate them by the torsional force at the time of tightening the nut before assembling the pipe joint, the sleeves are less likely to be misoriented during the assembling. The two fastening sleeves are a set of fittings
It is separated with the nut tightening operation performed when standing.
When joining sleeves, the tapered surface
Since the power exerted between each other can be used,
Can be combined.

Further, by tightening the nut, the two sleeves are separated from each other, and their original functions are exhibited.

If one of the two fastening sleeves joined to each other before assembly is joined to the corresponding part of the nut,
An error in the orientation of the sleeve during assembly is further reduced.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a state before assembling the pipe joint of FIG.

As shown in FIG. 1, before assembling, the tapered surface (2b) of the first sleeve (2) and the tapered surface (3a) of the second sleeve (3) are tightened when the nut (4) is tightened. They are joined to each other with a force enough to separate them by the torsional force. Appropriate means such as bonding with an adhesive, bonding with various brazing materials or plating can be used as such a bonding method.

The pipe joint and the pipe (7) are assembled as follows.

First, the pipe (7) is inserted into the nut (4) and the second sleeve (3) and the first sleeve (2) joined to each other from the right side, and the left end portion of the pipe (7) is connected with a joint. Element
Insert into the large diameter part (1b) of (1). Then, screw the female screw (8) of the nut (4) into the male screw (6) of the joint member (1),
Tighten the nut (4). When the nut (4) is tightened, a torsional force acts on the joint surface of the two sleeves (2) and (3), thereby separating the two sleeves (2) and (3) from the joint surface. Therefore, the two sleeves (2) and (3) become independent parts,
Demonstrates its original function. First tighten the nut (4) by hand.
After the nut (4) stops rotating,
It is preferable to do it by tightening tightly with pana etc.
The amount of rotation of the nut (4) when tightening with a spanner, etc.
Setting, all fittings can be
Tightening with less sticking becomes possible.

The two sleeves (2) and (3), once tightened by the nut (4), cut into the pipe (7) and are joined,
Loosen the nut (4) so that it does not come off the pipe (7).

Prior to assembling the pipe joint, the two sleeves (2) and (3) are joined together,
The right end surface (3c) of (3) may be similarly joined to the left surface of the flange (4a) of the nut (4).

[0030]

According to the present invention, since the two sleeves are joined to each other before assembly, it is possible to prevent the sleeves from being assembled in the wrong direction, and to separate the two sleeves after assembly. The original function can be exhibited. Moreover, the two tightening sleeves are
Separated due to nut tightening work performed during assembly
So no special operation for separation is required, and
When joining sleeves to each other,
Easy to use with small force because the force that exerts can be used
Can be joined.

By assembling one of the two tightening sleeves joined to the corresponding portion of the nut before assembling, it is possible to more reliably prevent the sleeve from being erroneously assembled.

[Brief description of the drawings]

FIG. 1 is an exploded longitudinal sectional view of a pipe joint before assembling showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing the pipe joint in an assembled state.

[Explanation of symbols]

 (1) Tubular joint member (2) First tightening sleeve (3) Second tightening sleeve (4) Nut

Claims (4)

(57) [Claims] 1. A tubular joint member into which a pipe is inserted from one end side,
It has two clamping sleeves fitted around a tube protruding from one end of the coupling member, and a nut for clamping the two clamping sleeves to fix the tube to the coupling member, and a taper provided on one of the sleeves. Face and the other
Make sure that the tapered surface of the sleeve
Are, these two clamping sleeve before assembly
Characterized in that said tapered surfaces are joined to each other with a force enough to separate them by a torsional force at the time of nut tightening. 2. The assembly according to claim 1, wherein, prior to assembly, one of the two fastening sleeves joined to the corresponding portion of the nut with such a force that the two fastening sleeves are separated by a torsional force when tightening the nut. Pipe fittings. 3. A tubular joint member into which a pipe is inserted from one end side,
A method of assembling a pipe joint comprising: two tightening sleeves fitted around a pipe protruding from one end of the joint member; and a nut for tightening the two tightening sleeves to fix the pipe to the joint member. Tapered surface on one sleeve and other sleeve
The taper surface provided in the
Ri, dense the tapered surfaces of the two clamping sleeves
Assembling a pipe joint characterized in that the two tightening sleeves thus joined are fitted around a pipe and fastened with a nut, so that they are brought into contact with each other and are separated from each other by a torsion force when tightening the nut. Method. 4. The pipe joint assembly according to claim 3, wherein one of the two fastening sleeves joined to each other is joined to a corresponding portion of the nut with a force enough to separate by a torsion force when tightening the nut. Method. Before assembling the pipe joint, the two tightening sleeves are joined to each other with a force enough to separate them by the torsional force at the time of tightening the nut. The two fastening sleeves are a set of fittings
It is separated with the nut tightening operation performed when standing.
When joining sleeves, the tapered surface
Since the power exerted between each other can be used,
Can be combined.