JPH10185052A - Coupling structure for high pressure piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupling structure for high pressure piping in which a high accuracy of processing is unnecessary to a seal seat surface, as well as a screwing fastening is unnecessary, and the time of the fastening work can be reduced. SOLUTION: In this coupling structure for high pressure piping, a tube body 36 having a fitting seal seat 34 at the tip is connected to a tube body 32 to be connected having a step form of receiver seal seat 28 at the middle part of a hole 26. Between the receiver seal seat 28 of the connected tube body 32, and the fitting seal seat 34 of the tube body 36, a gasket 38 made of a metal or a high polymer material favorable to the seat seats 28 and 34, and possible to contact closely to them, is provided, and the tube body 36 presses the gasket 38, so as to make the receiver and the fitting seal seats 28 and 34 in a sealed condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a high-pressure pipe for connecting a tube to a connected pipe having a stepped seal seat in the middle of a hole.

[0002]

2. Description of the Related Art Conventional high pressure pipe joint structures such as diesel fuel injection pipes and brake tubes generally have a tapered surface formed on a pipe to be connected and a tapered surface formed on a tube. The tapered surfaces of the body were connected by press printing.

[0003] For example, in the case of a fuel injection pipe joint structure, the following has occurred.

A receiving tapered surface 16 is formed at the tip of a connected pipe body 14 having a male screw portion 12 at the tip,
Taper surface 2 against tip bulging engagement portion 20 of tube body 18
Form 2 A cap nut 25 having an engagement adapter 24 mounted inside is mounted on the distal end bulging engagement portion 20 of the tube body 18. The fastening of this joint structure was performed by screwing the cap nut 25 into the male screw portion 12.

[0005]

However, in the case of the joint structure for a high-pressure pipe as described above, since the pressure contact between the seal seats is performed by screw fastening, the connection work also requires time. Also,
For the printing connection between the metals, high-precision processing including centering of the tapered surfaces (seal seats) was required.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a joint structure for a high-pressure pipe, which does not require screw fastening, shortens the time of fastening work, and does not require high-precision machining of the seal seat surface. I do.

[0007]

The joint structure for high-pressure piping according to the present invention solves the above-mentioned problems by the following constitution.

A structure in which a tube body having a seal seat at the tip is connected to a connected pipe body having a step-shaped receiving seal seat in the middle of a hole, and wherein the receiving seal seat of the connected pipe body is applied to the tube body A metal or polymer gasket of a material that can be fitted and adhered to each seal seat is interposed between the seal seats, and the tube body presses the gasket via the cam mechanism to seal the gap between the receiving and contact seal seats. It is characterized by being made possible.

[0009]

Next, each component of the above means will be described in detail.

(1) Basically, there is a structure in which a connected pipe body 32 having a stepped receiving seal seat 28 in the middle of the hole portion 26 is connected to a tube body 36 having a seal seat 34 at the tip. Between the receiving seal seat 28 of the connected pipe body 32 and the abutment seal seat 34 of the tube body 36, a metal or resin gasket 38 of a material which can be closely fitted to the two seal seats 28 and 34 is interposed. The pressure 36 presses the gasket 38 via the cam mechanism so that the space between the receiving and contact seal seats 28 and 34 can be sealed. (2) More specifically, it is as follows.

The connected pipe body 32 has a stepped receiving seal seat 28 in the middle of the hole 26, and a flange 4
0, and a push plate insertion hole 42 is formed at a position inside the flange portion 40 via a cam mechanism seat portion 41.
Here, the receiving seal seat 28 is formed at the boundary between the small diameter portion 28a at the base and the large diameter portion 28b at the tip. The connected pipe body 32 is usually formed integrally with the device main body B. The cam mechanism seat 41 is formed of a perfect circular recess so that an elliptical cam 56 described later can be guided and rotated. It has been. Cut out as shown in the figure.

A cylindrical gasket 38 having a receiving step 38a in the middle is inserted into the connected pipe body 30. Here, the distal end side of the receiving step portion 38a is thick over the entire length, but may be formed by a partial inner flange portion as shown by a dotted line. The base side of the cylindrical gasket 38 is a guide cylinder part 38a so that the tube body 36 is not inserted eccentrically. Further, the material of the cylindrical gasket 38 is not particularly limited as long as it can be adapted to and close to the seal seats 28 and 34. Usually, metal such as copper is used, but polymer materials such as resin and rubber can also be used.

The cylindrical gasket 38 has an engaging projection 4
4 is inserted. When the tube 36 is inserted into the cylindrical gasket 38, the engagement convex portion 44 is formed at the opening of the push plate insertion hole 32 of the connected pipe 32. Also,
The engaging projection 44 may be formed by cutting, but usually,
It is formed by plastic working (bulge working).

Gate-shaped push plate 4 provided with leg portions 46 on both sides
8 is inserted from the push plate insertion hole 42, and the opposite leg portion 46 sandwiches the tube body 36 and is engaged with the front side of the engagement convex portion 44.

A gate-shaped cam fastener 52 having a pair of arms 50 on both sides is mounted on the cam mechanism seat 41.

Then, the tube body 18 is pressed by the rotation of the elliptical cam 56 formed inside the distal end of the pair of arms 50 via the push plate 48 and the engaging projection 44 of the tube body 36, and the gasket 38 presses the tube body 18. A seal is formed between the abutment seal seat 34 at the tip of 36 and the receiving seal seat 28 of the connection pipe body 14.

Although the elliptical cam is taken here as an example of the cam shape, any cam shape such as a semicircular cam, a yoke cam, and a linear cam can be used.

(3) Next, the usage of the above embodiment will be described.

The cam fastening pair 52 is mounted on the cam mechanism seat 41 of the connected pipe body 32 and the gasket 38 is inserted into the connected pipe body 32 in advance.

Next, the tube body 18 is inserted into the connected pipe body 32, the push plate 48 is inserted through the push plate insertion hole 42, and the tube body 18 is connected to the leg portion 46 of the push plate 48.
To elastically clamp the spring.

Then, the arm 50 of the cam fastener 52 is rotated upward. Then, the elliptical cam 56 rotates in the horizontal direction from the upright position, and the lock concave portion 41b of the cam mechanism seat portion 41 is formed.
And stop. Thus, the push plate 48 is moved to the elliptical cam 5.
6, the tube body 18 presses the gasket 38 at the distal end thereof via the engagement convex portion 44, and
At 8 and 30, the gasket 38 is adapted and closely contacted, and a sufficient sealing property is secured.

[0022]

The joint structure for high pressure piping of the present invention
With the above configuration, the following operation and effect can be obtained.

The gasket is compressed by the cam mechanism via the push plate, and the gasket fits and presses in the respective seal seats of the connected body and the tube body. That is, after the tube body is inserted into the connected pipe body, the push plate is inserted into the push plate insertion hole, and thereafter, the cam fastening body is simply rotated to ensure sufficient sealing performance.

Accordingly, screw fastening is not required and the time for fastening operation can be shortened, and high precision machining of the seal seat surface is not required.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a conventional joint structure in a diesel fuel injection pipe.

FIG. 2 is a sectional view showing an example of a joint structure according to the present invention before the joint is fastened.

FIG. 3 is a cross-sectional view after fastening the joint.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 2;

FIG. 5 is a perspective view corresponding to the joint structure shown in FIG. 2;

FIG. 6 is a perspective view showing a contact plate used in FIG. 2;

FIG. 7 is a perspective view showing the same cam fastening body.

[Explanation of symbols]

 Reference numeral 26: hole of the pipe to be connected 28: receiving seal seat 32: pipe to be connected 34: sealing seat 36: tube body 38: gasket 40, flange 41, cam mechanism seat 41a, chord 41b, lock recess 42, push plate insertion hole 44, engagement protrusion 46 Leg of push plate 48 Push plate 50 Arm 52 Cam fastening body 56 Elliptical cam

Claims (2)

[Claims] 1. A structure in which a connected pipe body having a step-shaped receiving seal seat in the middle of a hole is connected to a tube body having a sealing seat at the tip end, wherein the receiving seal seat of the connected pipe body and A gasket made of a metal or a polymer material of a material that can be closely fitted to and close to each of the seal seats is interposed between the contact seal seats of the tube body, and the tube body presses the gasket via a cam mechanism, and A joint structure for high-pressure piping, wherein a space between a receiving and a contact seal seat can be sealed. 2. The connected pipe body has a stepped seal seat in the middle of the hole, has a flange on the outer periphery of the distal end, and further inserts a push plate at a position inside the flange via a cam mechanism seat. A hole is formed, a cylindrical gasket having a receiving step portion in the middle is inserted into the connected pipe body, and the tube body having an engaging projection in the middle is inserted into the cylindrical gasket, A gate-shaped push plate having opposite leg portions on both sides is inserted from the push plate insertion hole, and the opposite leg portions engage the front side of the engagement convex portion while clamping the tube body. A gate-shaped cam fastener provided with a pair of arms is mounted on the cam mechanism seat, and the engagement convex portion of the push plate and the tube body is formed by rotation of an elliptical cam formed inside the distal end of the pair of arms. Through the tube, and presses the tube with the gasket. Joint structure for high-pressure pipe according to claim 1, wherein the seal between the sealing seat of the the tip of the probe body to be connected the pipe.