JP2000009271A - Fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting that prevents its gasket from dropping down and imparts improved sealing performance to it. SOLUTION: A cylindrically projecting portion 6 has a locking projection 6a at its end. A gasket 5 is constituted of a C-shaped plate 9 of metal or resin and an O- or ring-shaped seal material 10 of rubber or elastomer joined to the periphery of the C-shaped plate 9. The inside diameter ϕA of the C-shaped plate 9 is smaller than the outside diameter ϕB of the locking projection 6a. The gasket 5 is therefore fitted about the cylindrically projecting portion 6 while the C-shaped plate 9 is diametrally expanded. The gasket 5 is prevented from dropping off the cylindrically projecting portion 6. The O-shaped seal material 10 also offers improved sealing reliability. The rigidity of the C-shaped plate 9 prevents the O-shaped seal material 10 from damaging even against high pressure applied thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint capable of obtaining high sealing performance.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a pipe joint used for connecting a high-pressure pipe of a vehicle refrigeration cycle. This pipe joint joins a male piece J2 having a cylindrical protrusion J1 and a female piece J3 into which the cylindrical protrusion J1 is fitted. Between the two pieces J2 and J3, there is a seal. Gasket J4 is interposed.

[0003]

The gasket J4 used in the prior art has a ring shape and is mounted around a cylindrical projection J1.
, J3, so both pieces J2,
During fastening work of J3, the gasket J4 was likely to fall off, resulting in deterioration of the workability of fastening. In addition, the gasket J4 has fallen off, causing a problem that the gasket J4 is assembled without being attached, and the work of refastening is performed. On the other hand, the conventional gasket J4 is made of a low-hardness metal which is tightened in the axial direction and is plastically deformed to seal between the two pieces J2 and J3. For this reason, the conventional gasket J
No. 4 had a problem that the reliability of the seal was inferior to the rubber seal.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pipe joint which prevents a gasket from falling off and has an improved sealing property.

[0005]

A gasket is mounted around a cylindrical projection. Although the inner diameter of the C-shaped plate is smaller than the outer diameter of the locking projection, the C-shaped plate is partially cut, so that the C-shaped plate can be enlarged at the time of mounting, and can surmount the locking projection. . After the C-shaped plate has passed over the locking projection, the C-shaped plate and the O-shaped sealing material restore the C-shaped plate again.
The inner diameter of the mold plate is smaller than the outer diameter of the locking projection. As a result, the gasket is attached to the cylindrical projection, and the gasket is prevented from falling off from the cylindrical projection. Then, when the male side piece and the female side piece are fastened,
The O-shaped sealing material of the gasket is tightened and elastically deformed between the two pieces to seal between the two pieces.

Thus, before the two pieces are fastened,
Since the gasket is assembled so as not to fall off from the cylindrical projecting portion of the male side piece, there is no problem that the gasket falls off at the time of the work of fastening both pieces, and the workability of the work is improved as compared with the related art. In addition, since there is no inconvenience of assembling without mounting the gasket, there is no need for re-fastening. On the other hand, since the two pieces are sealed by the elastic deformation of the O-type sealing material made of an elastically deformable material, the sealability is easily secured as compared with the conventional low-hardness metal gasket, and the reliability of the seal is improved. Can be increased.

According to the second aspect of the present invention, by applying the present invention to the connection of a refrigerant pipe of a refrigeration cycle for a vehicle, the workability of fastening the refrigerant pipe in a vehicle can be improved, and the reliability of the seal can be improved.

[0008] A high pressure is also applied to the gasket in the pipe joint of the high pressure pipe. For this reason, if a rubber O-ring is used instead of the gasket, the O-ring is broken at a high pressure, and the O-ring may be protruded. However, since the gasket of the present invention avoids damage to the O-type sealing material due to the rigidity of the C-type plate, a high pressure-resistant seal can be realized even when applied to a pipe joint of a high-pressure pipe.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. The pipe joint shown in the present embodiment is a high-pressure pipe 1 in a vehicle refrigeration cycle.
(Corresponding to refrigerant piping)
As shown in the sectional view of FIG. 1, it is composed of a male side piece 3 and a female side piece 4 which are fastened by tightening bolts 2, and a gasket 5 for sealing between the two pieces 3, 4.

The male side piece 3 is provided with a cylindrical projection 6 having a cylindrical shape projecting downward in the figure. The inside of the cylindrical protruding portion 6 communicates with the high-pressure pipe 1, and a distal end thereof is provided with a locking protrusion 6 a protruding in an outer radial direction. Although an annular flange is shown as an example of the locking projection 6a, the locking projection 6a may be constituted by a plurality of projections. The female side piece 4 is provided with a concave portion 7 into which the cylindrical projection 6 of the male side piece 3 is fitted.
At the bottom of the concave portion 7, a female-side passage 8 communicating with the inside of the cylindrical protrusion 6 is formed.

The gasket 5 is formed by integrating a C-shaped plate 9 having a substantially C-shape and an O-shaped sealing material 10 having a ring shape, and will be described with reference to FIG. 2A is a plan view of the gasket 5, and FIG. 2B is a sectional view thereof. The C-shaped plate 9 is a plate made of a metal or resin having a C-shape in which a part of a ring is cut. When an enlarging force is applied, the diameter increases due to the enlargement of the cut portion. It is to return to. The inner diameter φA of the C-shaped plate 9 is set slightly smaller than the outer diameter φB of the locking projection 6a provided on the cylindrical projection 6. The O-shaped seal member 10 is a seal ring made of an elastically deformable material such as rubber or an elastomer having a ring shape, and is bonded to the periphery of the C-shaped plate 9 by baking or bonding.

The assembly of the pipe joint will be described. The gasket 5 is mounted around the cylindrical protrusion 6 in advance. Although the inner diameter dimension φA of the C-shaped plate 9 is smaller than the outer diameter dimension φB of the locking projection 6 a, when the C-shaped plate 9 is pressed against the cylindrical projection 6, the C-shaped plate 9 is tapered by the tapered portion 6 b of the cylindrical projection 6. The diameter of the plate 9 is expanded and gets over the locking projection 6a. After the C-type plate 9 has passed over the locking projection 6a, the C-type plate 9 contracts again due to the restoring force of the C-type plate 9 and the O-type sealing material 10, and as a result, the gasket 5 is assembled, so that the gasket 5 does not fall off from the cylindrical protrusion 6. To assemble the pipe joint, the cylindrical protrusion 6 is fitted into the recess 7, the bolt 2 is tightened, and the male piece 3 and the female piece 4 are fastened. The fastening force of the bolt 2 causes the gasket 5
The mold sealing material 10 is compressed between the two pieces 3 and 4 and elastically deforms, thereby sealing between the two pieces 3 and 4.

As described above, in the pipe joint of the present embodiment, before the two pieces 3 and 4 are fastened, the gasket 5 is previously assembled so as not to fall off from the cylindrical projecting portion 6 of the male side piece 3. Therefore, there is no problem that the gasket 5 falls off during the fastening work of the two pieces 3 and 4, and the workability of the fastening is improved. Also, since there is no problem that the gasket 5 is not attached and assembled, there is no need to re-fasten,
Work efficiency is improved. On the other hand, the space between the two pieces 3 and 4 is sealed by the elastic deformation of the O-type sealing material 10 made of an elastically deformable material such as rubber or elastomer, so that the sealing performance is lower than that of a conventional metal gasket having a low hardness. Easy to secure. For this reason, the reliability of the pipe joint seal can be improved.

Since the pipe joint of this embodiment is applied to the connection of the high-pressure pipe 1 of the refrigeration cycle for a vehicle, the workability of connecting the high-pressure pipe 1 when assembling the refrigeration cycle to the vehicle can be improved, and at the same time, a high seal can be obtained. Reliability can be obtained. Further, the pipe joint of the present embodiment is applied to the connection of the high-pressure pipe 1 of the vehicle refrigeration cycle. However, even if a high pressure is applied to the gasket 5, the rigidity of the C-type plate 9 damages the O-type sealing material 10. Is avoided, so that a high pressure sealing property can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pipe joint (embodiment).

FIG. 2 is a plan view and a sectional view of a gasket (embodiment).

FIG. 3 is a cross-sectional view of a pipe joint (conventional example).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-pressure pipe (refrigerant pipe) 3 Male side piece 4 Female side piece 5 Gasket 6 Cylindrical protrusion 6a Locking projection 9 C-type plate 10 O-type sealing material

Claims (3)

[Claims] 1. A male side piece having a cylindrical projection, a female side piece into which the cylindrical projection is fitted, and interposed between the two pieces and fastened in the axial direction to provide a gap between the two pieces. A gasket to be sealed, wherein a locking projection is provided at an end of the cylindrical projection to protrude in an outer diameter direction, and the inner diameter of the gasket has the locking projection. A C-shaped plate which is smaller than the outer diameter of the C-shaped plate and has a substantially C-shape, and an O-shaped sealing member which is provided around the C-shaped plate and is made of an elastically deformable material and has a ring shape. Plumbing fittings. 2. The pipe joint according to claim 1, wherein the pipe joint is used to connect a refrigerant pipe of a vehicle refrigeration cycle. 3. The pipe joint according to claim 1, wherein the pipe joint is used for connecting a high-pressure pipe through which a high-pressure fluid flows.