JPH10110880A - Connecting structure body for connector and pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting structure body for a connector and a pipe high in reliability, suppressing radial play between a connector and a pipe and improving sealing performance so as to be adaptable to particularly a very low temperature sealing performance test of -40 deg.C. SOLUTION: A connecting structure body consists of a pipe 2 having a locking collar part 21 at the periphery, and a connector 1 provided with a locking member 15 and an O-ring inside. The locking collar part 21 of the pipe 2 inserted from an opening part 12 is engaged with the locking member 15, and a space to the peripheral surface of the pipe 2 is sealed with the O-ring. An annular protruding part 41 is provided at the peripheral surface of the pipe 2 opposed to the opening part inner peripheral edge 12a of the connector 1, or an annular ring 42 is mounted on one end of the connector 1 and brought in proximity to or in contact with the pipe 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-touch connector used as a pipe joint for an automobile,
The present invention relates to a connector-to-pipe connection structure for suppressing backlash between a pipe connected to the connector.

[0002]

2. Description of the Related Art Conventionally, as a pipe joint for an automobile,
Many one-touch connectors as shown in FIG. 1 are used. The connector 1 is made of a cylindrical synthetic resin having a shaft hole 11 at the center of the shaft. The housing 3 has an opening 12 for inserting the pipe 2 at one end, and the tube 3 is fitted over the other end. A concave portion 1 having a diameter larger than that of the opening 12 adjacent to the opening 12 inside the opening 12 inside one end of the shaft hole 11.
4 are formed.

A locking member 15 having a synthetic resin formed in an annular shape at one end side is provided in the concave portion 14 of the connector 1 in the radial direction.
An O-ring 16 is arranged at the other end side. The O-ring 16 is connected to the locking member 1 at one end.
5 and the inner wall of the other end of the housing portion 10 are positioned so as to hardly move in the axial direction.

A pipe 2 inserted into this connector 1
Is made of a synthetic resin or a metal, and has a locking flange 21 on its outer periphery. When the pipe 2 is inserted into the housing part 10 through the opening 12 of the connector 1, the locking flange 21 is engaged with the locking claw 15 a of the locking member 15 of the connector 1.
Is pushed and spread while moving along the inclined surface, but once passed, the locking claw 15a returns to its original position, so that the locking flange 21 engages with the locking claw 15a of the locking member 15. Stop and cannot move to one end side. In this way, at the same time that pipe 2 is connected to connector 1,
Is sealed by an O-ring 16 between the outer peripheral surface of the connector 1 and the inner peripheral surface of the connector 1.

However, when the pipe 2 is inserted, the locking claw 15a of the locking member 15 and the recessed portion 14 in the housing portion 10 can be pushed and spread in the radial direction.
A gap 14a in the radial direction is provided in advance, so that when the pipe 2 is connected to the connector 1, the play in the radial direction perpendicular to the axis is large as shown in FIG. Even if the sealing property can be ensured by the ring 16, there is a problem that the sealing property is lowered at a low temperature.
This is because the elasticity of the O-ring 16 is impaired at low temperatures, so that the O-ring 16
Is displaced and its recovery is delayed.

[0006]

As described above, conventional connectors and pipes have a large backlash in the radial direction at the time of connection, and thus have a problem in the sealing property especially at low temperatures. Conventionally, measures such as arranging double O-rings and using O-rings having good low-temperature performance have been taken, but the cost increase due to such measures has been unavoidable.

[0007] Even with such improvement of the O-ring, it has been extremely difficult to pass the sealing test at cryogenic temperatures. In this cryogenic seal test, a tube and a pipe were connected to both ends of the connector at -40 ° C.
While maintaining the pipe at a very low temperature, and applying a radial force to the pipe, the presence or absence of leakage of the pressurized gas flowing inside is checked.

The present invention has been made in view of such a conventional situation,
Reliable connector-to-pipe connection structure that suppresses radial play between the connector and the pipe, improves sealing, and is particularly suitable for sealing tests at -40 ° C cryogenic temperatures. The purpose is to provide.

[0009]

In order to achieve the above object, a connector-pipe connection structure provided by the invention of claim 1 has a pipe having a locking flange on the outer periphery and a shaft hole. And a connector provided with a housing portion at one end portion, a locking member held at one end side in the housing portion, and an O-ring attached to the other end side, and an opening formed at one end of the housing portion. While engaging the locking flange of the pipe inserted into the housing with the locking member,
In a connector / pipe connection structure for sealing a space between the pipe and an outer peripheral surface with an O-ring, an annular protrusion is provided on an outer peripheral surface of the pipe facing an inner peripheral edge of the opening of the housing portion.

In this connector / pipe connection structure, the outer diameter of the annular projection is at least the same as the outer diameter of the locking flange of the pipe, but is preferably larger than the outer diameter of the locking flange. Then, the gap between the annular projection of the pipe and the inner peripheral edge of the opening of the connector at the time of connection is set to be as small as possible.

If it is difficult to set a gap between the annular projection of the pipe and the inner peripheral edge of the opening of the connector, an annular ring is further attached to the opening side edge of the connector. By allowing the annular ring to approach or abut on the outer periphery of the annular projection of the pipe inserted into the opening, it is possible to suppress play.

Further, according to the present invention, there is provided a pipe having a locking flange on an outer periphery, a locking member having a shaft hole and a housing at one end, and being held at one end in the housing. And a connector provided with an O-ring mounted on the other end, and engages with a locking member with a locking flange of a pipe inserted into the housing through an opening formed at one end of the housing. At the same time, in a connector-pipe connection structure that seals between the pipe outer peripheral surface with an O-ring, an annular ring is attached to one end of the housing portion, and the annular ring is attached to the outer periphery of the pipe inserted from the opening. It is characterized by being close to or in contact with.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A connector and pipe connection structure of the present invention will be described with reference to FIG. The connector 1 is the same as the conventional one shown in FIG. That is, a housing section 10 made of a cylindrical synthetic resin having a shaft hole 11 at the center of the shaft, having an opening 12 for inserting the pipe 2 at one end, and a connection tube for externally fitting a tube to the other end. A recess 13 having a portion 13 and having a larger diameter than the opening 12 is formed inside the opening 12 adjacent to the opening 12 inside one end of the housing portion 10.

At one end of the housing portion 10 of the connector 1, a locking member 15 made of a synthetic resin in an annular shape is inserted and held so as not to move in the axial direction. Housing part 1
An O-ring 16 is disposed on the other end of the “0”. At least a part of the inner periphery of the locking member 15 is formed with a locking claw 15a protruding inward, and one end side surface is tapered. Further, the O-ring 16 is used for the locking member 1.
5 and the inner wall of the other end of the housing portion 10 is positioned and mounted so as to hardly move in the axial direction.

On the other hand, the pipe 2 inserted into the connector 1 is made of synthetic resin or metal, and has a locking flange 21 on its outer periphery as in the prior art. Therefore, the pipe 2 is moved from the opening 12 of the connector 1 to the housing 10.
When the locking claw 15a is inserted into the inside of the connector 1, the locking claw 15a pushes and spreads while moving along the tapered surface of the locking claw 15a of the locking member 15 of the connector 1. In order to return to the original position, the locking flange 21 abuts on the locking claw 15a and cannot move to one end side.

The pipe 2 has an opening inner peripheral edge 1 of a housing 10 formed at one axial end of the connector 1.
An annular projection 41 is provided on the outer peripheral surface facing 2a. Therefore, when the pipe 2 is inserted into the connector 1 and connected, the annular projection 41 fills a gap between the inner peripheral edge 12 a of the opening formed at one end of the housing 10 of the connector 1 and the outer peripheral surface of the pipe 2. That is, when a radial force is applied to the pipe 2, the annular projection 41
Because the pipe 2 does not move in the radial direction any more by contacting the inner peripheral edge 12a of the opening, the play in the radial direction can be reduced.

As a result, even if a radial force is applied to the pipe 2, the displacement of the O-ring 16 can be suppressed to a small extent because the pipe 2 has little backlash. Therefore, the connector-pipe connection structure of the present invention not only has excellent sealing properties in a normal state, but also can be adapted to a sealing test at an extremely low temperature of -40 ° C.

Further, since the opening 12 of the connector 1 is almost closed by the annular projection 41, dust and the like can be prevented from entering the recess 14 of the connector 1, and the dust-proof effect of the seal portion can be prevented. Is also excellent.

The outer diameter of the annular projection 41 provided on the pipe 2 is preferably within a range that can be stored in the opening 12 of the connector. .

In the case where the outer diameter of the annular projection 41 cannot be made so large by design, and therefore the gap between the annular projection 41 of the pipe 2 and the inner peripheral edge 12a of the opening of the connector 1 becomes large, FIG. As shown in FIG. 4, an annular ring 42 or 43 is attached to the edge of the connector 1 on the opening 12 side, and the annular rings 42 and 43 are attached to the outer periphery of the annular projection 41 of the pipe 2 inserted into the opening 12. By causing the pipe 2 to approach or abut, it is possible to suppress backlash in the radial direction of the pipe 2. That is, the annular ring 42 or 43 is attached to the edge of the connector 1 on the side of the opening 12, so that the radial play at the time of connection between the connector 1 and the pipe 2 can be suppressed.

For example, in the connector / pipe connection structure shown in FIG. 3, an annular ring 42 is fitted into a gap remaining between the annular projection 41 provided on the pipe 1 and the inner peripheral edge 12a of the opening of the connector 1. I have. This annular ring 4
By adjusting the thickness of 2 to be close to or in contact with the annular projection 41, it is possible to almost fill the gap between the annular projection 41 and the inner peripheral edge 12 a of the opening of the connector 1. If the annular ring 42 is formed in a cap shape having an annular groove concentrically with the central insertion hole as shown in FIG. It can be installed without doing.

In the connector-pipe connection structure shown in FIG. 4, the outer diameter of the pipe 2 other than the portion 2b inserted into the recess 14 is increased, and the large-diameter portion 2a forms an annular projection. ing. A cap-shaped annular ring 43 having an insertion hole in the center and having an outer peripheral edge bent at a substantially right angle is fitted to one peripheral edge of the connector 1 on the opening 12 side. By adjusting the inside diameter of the insertion hole 43a of the annular ring 43 so as to approach or contact the large diameter portion 2a of the pipe 2, the displacement (play) of the pipe 2 in the radial direction is improved.
Can be almost eliminated.

Further, an annular ring 42 or 43 as shown in FIG. 3 or FIG. 4 is attached to one end of the housing portion 10 of the connector 1 shown in FIG. Alternatively, by extending the inner peripheral end of the annular ring 43 inward in the radial direction so that the insertion holes 42a or 43a of the annular rings 42 or 43 approach or abut on the outer periphery of the pipe 2, respectively, the pipe 2 shown in FIG. Annular projection 4
1, and the displacement of the pipe 2 in the radial direction can be suppressed without having to partially increase the outer diameter of the pipe 2 as shown in FIG. In this case, the annular rings 42 and 43 are ring-shaped integral members that cannot be opened and closed, and the entire inner circumference thereof is smaller than the outer diameter of the locking flange 21 of the pipe 2. Must be inserted.

[0024]

According to the present invention, the backlash in the radial direction between the connector and the pipe can be suppressed, the displacement of the O-ring inside the connector can be minimized, and the sealing performance can be improved. Therefore, it is possible to provide a highly reliable connector-pipe connection structure that can be applied to a sealing test at an extremely low temperature of −40 ° C.

[Brief description of the drawings]

FIG. 1 is a schematic partially cutaway side view showing a conventional connector-pipe connection structure.

FIG. 2 is a schematic partially cutaway side view showing a specific example of the connector-pipe connection structure of the present invention.

FIG. 3 is a schematic partially cutaway side view showing another specific example of the connector-pipe connection structure of the present invention.

FIG. 4 is a schematic partially cutaway side view showing still another specific example of the connector / pipe connection structure of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connector 10 Housing part 11 Shaft hole 12 Opening 12a Opening inner peripheral edge 13 Connection cylinder part 14 Depression 14a Gap 15 Locking member 15a Locking claw 16 O-ring 17 Pressing bush 2 Pipe 21 Locking flange 3 Tube 41 42, 43 annular ring

Claims (4)

[Claims] 1. A pipe having a locking flange on the outer periphery, a shaft having a shaft hole and a housing at one end, and a mounting member held at one end of the housing and mounted on the other end. And a connector provided with an O-ring. The engaging flange of the pipe inserted into the housing portion from the opening formed at one end of the housing portion is engaged with the locking member. A connector / pipe connection structure, wherein an annular projection is provided on an outer peripheral surface of the pipe facing an inner peripheral edge of an opening of the housing portion, wherein the connector and the pipe have an O-ring therebetween. 2. The connection structure between a connector and a pipe according to claim 1, wherein an outer diameter of the annular projection is equal to or larger than an outer diameter of a locking flange of the pipe. 3. An annular ring held at an edge of the connector on the opening side, wherein the annular ring is close to or in contact with an outer periphery of an annular projection of a pipe inserted into the opening. The connection structure of a connector and a pipe according to claim 1 or 2. 4. A pipe having a locking flange on the outer periphery, a shaft having a shaft hole and a housing at one end, and a locking member held at one end of the housing and mounted on the other end. And a connector provided with an O-ring. The engaging flange of the pipe inserted into the housing portion from the opening formed at one end of the housing portion is engaged with the locking member. In the connector / pipe connection structure in which the space is sealed by an O-ring, an annular ring is attached to one end of the housing portion, and the annular ring is close to or in contact with the outer periphery of the pipe inserted from the opening. A connector and pipe connection structure characterized by the following.