JPH08233165A - Pipe joint - Google Patents

Abstract

PURPOSE: To provide the pipe joint which can connect a hose to fluid equipment comparatively easily, and furthermore is easy in part management. CONSTITUTION: The pipe joint is so constituted that a box nut is mounted to the one end side of a hard bent pipe 1 rotatably in a detent condition, and concurrently a hose connecting section 3 is provided for the other end side, in this case, a nipple 4 is threadedly inserted in the box nut, and concurrently, a locking means 5 is provided for the box nut, which suspends the movement of the nipple 4 in the joint axial direction with respect to the box nut 2 before the threaded insertion of the box nut with the nipple comes off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting a hose to fluid equipment.

[0002]

2. Description of the Related Art As a pipe joint of this type, for example, FIG.
As shown in the figure, this pipe joint is rotatably attached to one end side of a metal bend pipe 90 and a cap nut 92 is attached in a retaining state, and a hose connection is made to the other end side. It is composed of a first part including the portion 91 and a second part including the nipple 93.

In this pipe joint, first, the hose connecting portion 9
After inserting the hose H into 1, the hose connection portion 91 is crimped to make the hose H in a non-removable state, and then one end of the nipple 93 is screwed into a screw hole h formed in the fluid device S, and subsequently, , Rotate the cap nut 92 to rotate the nipple 9
The hose H can be connected to the fluid device S by strongly tightening the other end of the hose 3.

In the connected state, a so-called wedge effect is generated between the tapered surface 93a of the nipple 93 and the tapered surface 90a of the bend tube 90, and the cap nut 92 is in a rotation preventing state. Therefore, the connection between the nipple 93 and the cap nut 92 and between the cap nut 92 and the bend pipe 90 will not be unintentionally loosened.

However, since the pipe joint is composed of the first part and the second part which is separate from the first part, it is troublesome to manage the two parts.

[0006]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a pipe joint in which a hose can be relatively easily connected to a fluid device and whose parts can be easily managed.

[0007]

In the pipe joint of the present invention, a cap nut 2 is rotatably attached to one end of a hard bend pipe 1 in a retaining state, and a hose connecting portion 3 is provided on the other end. The nipple 4 is screwed into the cap nut 2, and the nipple 4 moves in the joint axial direction with respect to the cap nut 2 before the cap nut 2 and the nipple 4 are unscrewed. A locking means 5 for stopping is provided.

[0008]

The present invention operates as follows.

A nipple 4 is screwed into the cap nut 2, and a locking means 5 for stopping the movement of the nipple 4 relative to the cap nut 2 in the joint axial direction before the cap nut 2 and the nipple 4 are unscrewed. Since the nipple 4 is provided, the nipple 4 does not separate from the cap nut 2. Therefore, it can be managed as one component.

In this pipe joint, the nipple 4 is screwed into the screw hole of the fluid device (during this work, the cap nut 2 rotates integrally with the nipple 4), and the rotation of the nipple 4 is stopped by a tool. When the cap nut 2 is screwed into the nipple 4,
The hose H attached to the hose connection part 3 can be connected to a fluid device.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described with reference to the drawings shown as embodiments.

As shown in FIG. 1, the pipe joint of this embodiment is provided with a bend pipe 1, a cap nut 2 attached to one end of the bend pipe 1, and another end of the bend pipe 1. It is composed of a hose connecting portion 3, a nipple 4 screwed into the cap nut 2, and locking means 5 for preventing the cap nut 2 and the nipple 4 from being separated from each other.

As shown in FIG. 1, the bend pipe 1 is formed by bending a metal pipe by 90 °, and has an enlarged diameter portion 10 having a tapered outer surface portion 10a having a diameter reduced toward the tip end at one end thereof. And the uneven portion 11 formed of a large number of circumferential grooves is formed on the outer peripheral surface on the other end side.

As shown in FIG. 1, the cap nut 2 has a hexagonal outer surface formed in a tubular shape as a whole, and has a large diameter hole portion 20 having a small inwardly projecting peripheral portion 50 and a female screw. It has a formed medium-diameter hole portion 21 and a small-diameter hole portion 22 having a smaller diameter than the enlarged diameter portion 10 of the bend pipe 1.

As shown in FIG. 1, the hose connecting portion 3 has a metal pipe 31 having an uneven portion 32 on its inner surface, which is externally inserted into a portion of the bend pipe 1 which includes the uneven portion 11.
1 is fixed to the bend pipe 1 via the ring body 30 by caulking (in the figure, a portion by caulking is indicated by 33).

The nipple 4, as shown in FIGS. 1 and 2,
A tool-corresponding portion 40 having an external hexagonal shape, and the tool-corresponding portion 4
Male threaded portion 41 provided on both sides of 0, and a large diameter portion 4 provided between the tool corresponding portion 40 and one male threaded portion 41.
2, the inner surface corresponding to the tool corresponding portion 40 and the male screw portion 41 on one side, and the taper inner surface portion 44 having a diameter increasing toward the end edge.
It consists of and. As shown in FIG. 2, the large-diameter portion 42 has a diameter slightly smaller than the inner diameter of the inwardly projecting peripheral portion 50, and a peripheral groove 43 is provided on the outer surface thereof. As shown in FIGS. 1 and 2, a snap ring 6 is fitted in the circumferential groove 43, and the snap ring 6 can be expanded and contracted by a metal circular ring as shown in FIG. The elastic member is set so that it can be completely accommodated in the circumferential groove 43 when its outer diameter is larger than that of the large-diameter portion 42 and is reduced in a natural state where no external force is applied. In the assembled state of the pipe joint, as shown in FIG.
More than half (may be less than half) of the whole is accommodated inside, and the taper surfaces of the snap ring 6 and the inwardly projecting peripheral portion 50 are locked before the cap nut 2 and the nipple 4 are unscrewed. In this manner, the contact point of the tapered surface of the inwardly projecting peripheral portion 50 and the snap ring 6 in the cross-sectional view in the locked state is set on the outer peripheral side with respect to the center diameter of the snap ring 6.

Therefore, when the male screw portion 41 on the side having the large diameter portion 42 is screwed into the medium diameter hole portion 21 (where the male screw is formed) of the cap nut 2, the snap ring 6 is inserted midway. Is reduced in diameter by the contact with the inwardly projecting peripheral portion 50 and crosses the inwardly projecting peripheral portion 50, and the snap ring 6 thereafter.
The nipple 4 is prevented from coming off from the cap nut 2 due to the expanded diameter. That is, in this embodiment, the snap ring 6 and the inwardly projecting peripheral portion 50 constitute the locking means 5. Due to the presence of the locking means 5, the nipple 4 and the cap nut 2 cannot be separated in this pipe joint, and they can be managed as one part, which facilitates management.

Further, when the cap nut 2 is unscrewed into the nipple 4 with a torque above a certain level using a tool, the snap ring 6 comes into contact with the taper surface of the inwardly projecting peripheral portion 50 in the middle thereof. When the hose needs to be replaced due to an accident or the like, the cap nut 2 and the nipple 4 are released from the engagement by being pushed into the circumferential groove 43 by the contact, so that the hose replacement can be performed relatively easily.

When the hose H is connected to the fluid equipment by this pipe joint, the work may be performed in the following order. Insert the hose H between the bend pipe 1 and the metal pipe 31,
The metal tube 31 is crimped to reduce the diameter of almost the entire metal tube 31. In this state, the convex portions of the concave-convex portions 11 and 32 bite into the hose H, and the fluid tightness between the hose H and the metal pipe 31 and the bend pipe 1 is secured. The nipple 4 is screwed into the screw hole h of the fluid device S using the tool corresponding portion 40 (during this work, the cap nut 2 rotates integrally with the nipple 4). While the rotation of the nipple 4 is stopped by using the tool corresponding portion 40, the cap nut 2 is screwed into the nipple 4 by utilizing the hexagonal outer surface portion thereof. When the screw-in amount reaches a certain value, the taper outer surface portion 10a and the taper inner surface portion 44 come into contact with each other, a so-called wedge effect is generated between them, and the cap nut 2 is in a rotation stop state. Therefore, the connection between the nipple 4 and the cap nut 2 and between the cap nut 2 and the bend pipe 1 will not be unintentionally loosened.

It should be noted that, instead of the structure of the locking means 5 of the above embodiment, the structure shown in FIG. 3, that is, the peripheral groove 43a is provided on the inner peripheral surface of the cap nut 2 and the peripheral groove 43a is formed. The snap ring 6 is fitted, and on the other hand, the outer peripheral projecting peripheral portion 50a is brought into a locked state with the snap ring 6 on the nipple 4 side.
Can also be formed. Even in this case, the snap ring 6 in the natural state is accommodated in the circumferential groove 43a in a half or more of the whole (or half or less), and the snap ring 6 and the snap ring 6 are disengaged before the cap nut 2 and the nipple 4 are unscrewed. The taper surface of the outward projecting peripheral portion 50a is in a locked state, and the abutting point of the taper surface of the outward projecting peripheral portion 50a and the snap ring 6 in the locked state in cross section is the snap ring 6. It is preferable to set it on the inner peripheral side with respect to the center diameter.

Further, instead of the structure of the locking means 5 of the above-mentioned embodiment, the structure shown in FIG. 4, that is, the cap nut 2 is used.
An inwardly projecting peripheral portion 50c is formed on the edge of the nipple 4
The outer projecting peripheral portion 50b is formed on the side, and the outer projecting peripheral portion 5 is formed.
Alternatively, the cap nut 2 may be formed by crimping the edge portion of the cap nut 2 in a state where 0b exceeds the inwardly projecting peripheral portion 50c.

[0022]

From the contents described in the section of operation, it is possible to provide a pipe joint in which a hose can be relatively easily connected to a fluid device and whose parts can be easily managed.

[Brief description of drawings]

FIG. 1 is a half sectional view of a pipe joint according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a locking means of the pipe joint.

FIG. 3 is an explanatory diagram of another embodiment of locking means.

FIG. 4 is an explanatory view of a locking means of another aspect.

FIG. 5 is a partial cross-sectional view of a prior art pipe fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bend pipe 2 Cap nut 3 Hose connecting part 4 Nipple 5 Locking means 43 Circumferential groove 43a Circumferential groove 50 Inward projecting peripheral part 50a Outer projecting peripheral part

Claims (5)

[Claims] 1. A hard bend pipe (1) having a cap nut (2) rotatably attached to one end of the hard bend pipe (1) and a hose connection (3) provided at the other end. Therefore, the nipple (4) is screwed into the cap nut (2), and the nipple (4) with respect to the cap nut (2) is removed before the cap nut (2) and the nipple (4) are unscrewed. ) Locking means (5) for stopping the movement of the joint in the axial direction
A pipe joint comprising: 2. A locking means (5) is provided with a peripheral groove (43) provided on the outer peripheral surface of the nipple (4) and a snap ring (6) partly housed in the peripheral groove (43). ) And an inwardly projecting peripheral portion (50) formed on the cap nut (2) which is in a locked state with the snap ring (6) before the screw engagement between the cap nut (2) and the nipple (4) is released. In addition, the contact point of the inwardly projecting peripheral portion (50) and the snap ring (6) in a sectional view in the locked state is set on the outer peripheral side with respect to the center diameter of the snap ring (6). The pipe joint according to claim 1, wherein: 3. A peripheral groove (43a) provided on the inner peripheral surface of the cap nut (2), and a locking means (5), and the peripheral groove (43).
Snap ring (6) partially housed in a)
And an outwardly projecting peripheral portion (50a) formed on the nipple (4) that is locked with the snap ring (6) before the cap nut (2) and the nipple (4) are unscrewed. The contact point of the outwardly projecting peripheral portion (50a) and the snap ring (6) in a sectional view in the locked state is set on the inner peripheral side with respect to the center diameter of the snap ring (6). The pipe joint according to claim 1, wherein: 4. The pipe joint according to claim 2, wherein a portion of the inwardly projecting peripheral portion (50) that abuts on the snap ring (6) is a tapered surface. 5. The pipe joint according to claim 3, wherein a portion of the outwardly projecting peripheral portion (50a) contacting the snap ring (6) is a tapered surface.