JP2002156085A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint capable of preventing the entry of foreign matter into a clearance between an outer peripheral face of a male pipe and an inner peripheral face of a female pipe from the outside. SOLUTION: Since an annular seal body 15 coming into contact with an opening end 5 of the female pipe 4 while the male pipe 2 and the female pipe 4 are mutually connected to prevent the entry of the foreign matter between the outer peripheral face of the male pipe 2 and the inner peripheral face of the female pipe 4 is mounted on the male pipe 2, it is possible to prevent the entry of the foreign matter between the outer peripheral face of the male pipe 2 and the inner peripheral face of the female pipe 4. As a result, it is possible to prevent the deterioration of an O-ring 10 and the corrosion of the male pipe 2 and the female pipe 4 and prolong service life of the pipe joint 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe joint, and more particularly to a pipe joint for a refrigerant pipe.

[0002]

2. Description of the Related Art As a conventional pipe joint, there is one shown in FIG. 4 (JP-A-52-62725). The pipe joint 1 is a pipe joint for a refrigerant pipe, and connects the male pipe 2 and the female pipe 4 by receiving the connection end 3 of the male pipe 2 from the open end 5 of the female pipe 4. Open end 5 of measuring tube 4
Is provided with a bead hook 6 while the male tube 2
An annular cage 7 and an annular spring 8 accommodated in the cage 7 are provided at the connection end 3 of the male pipe 2 by the bead hook 6, the cage 7 and the annular spring 8.
And the female tube 4 can be connected. This annular spring 8
A gutter spring is used. Further, two O-rings 10 are continuously provided on the outer peripheral surface of the connection end 3 of the male pipe 2 (between the cage 7 and the open end 9 of the connection end 3), and the male pipe 2 and the female pipe are provided. 4 prevents leakage of the refrigerant flowing inside.

[0003] The connecting process between the male pipe 2 and the female pipe 4 is specifically as follows. First, when the bead hook 6 of the female tube 4 is inserted into the opening 11 of the cage 7 from the state shown in FIG. 4A (FIG. 4B), the annular spring 8 accommodated in the cage 7 is applied to the outer periphery of the bead hook 6. Get on. Then, the bead hook portion 6 and the annular spring 8 riding on the outer periphery
Is inserted between the bead hook portion 6 and the hook portion 12 of the cage 7, and the bead hook portion 6 and the hook portion 12 are engaged to bring the male tube 2 and the female tube 4 into a connected state ( FIG. 4c). Such a pipe joint 1 has an advantage that the connecting operation can be performed with one touch.

[0004]

However, in the conventional pipe joint 1, as shown by a two-dot chain line in FIG.
When foreign matter (water or dust) enters the cage 7 from the opening 11, the foreign matter further enters a gap between the outer peripheral surface of the male tube 2 and the inner peripheral surface of the female tube 4. In particular, water that has entered from the outside easily accumulates in the O-ring mounting groove 13 for mounting the O-ring 10, causing deterioration of the O-ring 10 and corrosion of the male pipe 2 and the female pipe 4. 1 may shorten the life.

The present invention has been made in view of such a conventional technique, and can prevent foreign matter from entering between the outer peripheral surface of the male tube and the inner peripheral surface of the female tube. It is intended to provide a pipe joint.

[0006]

According to the first aspect of the present invention,
At the open end of the female tube that receives the male tube, a bead hook portion formed by expanding the open end into a flared shape is provided,
On the outer peripheral surface of the connection end of the male pipe, an annular cage having an opening that allows entry and exit of the bead hook part and a hook part is fixedly mounted, and when the female pipe is inserted, it rides on the outer circumference of the bead hook part. An annular spring which is inserted between the bead hook portion and the hook portion to engage the bead hook portion and the hook portion to connect the female tube and the male tube is provided in the cage. An O-ring was installed between the outer end of the male tube and the inner surface of the female tube between the male tube and the open end of the male tube to prevent fluid flowing inside the male tube and the female tube from leaking. In a pipe joint, an annular seal that contacts an open end of a female pipe in a connected state of a male pipe and a female pipe to prevent foreign matter from entering between an outer peripheral surface of the male pipe and an inner peripheral surface of the female pipe. The body is attached to a male tube. That.

According to a second aspect of the present invention, the annular seal body according to the first aspect is provided with a base fitted to the male pipe, and protruded from the base, and is elastically deformed when the female pipe is inserted to enter the bead hook. And a seal lip portion restoring the connected state of the male tube and the female tube and abutting against the open end of the female tube.

According to a third aspect of the present invention, the seal lip portion of the annular seal body according to the second aspect is characterized in that the thickness of the seal lip gradually decreases from the base end toward the tip end.

[0009]

According to the first aspect of the present invention, the male pipe and the female pipe are connected to each other and abut on the bead hook portion of the female pipe, and the gap between the outer peripheral surface of the male pipe and the inner peripheral face of the female pipe is formed. Since the annular seal body for preventing foreign matter from entering the male pipe is attached to the male pipe, it is possible to prevent foreign matter from entering between the outer peripheral surface of the male pipe and the inner peripheral face of the female pipe. Therefore, it is possible to prevent deterioration of the O-ring and corrosion of the male pipe and the female pipe beforehand, which contributes to a longer life of the pipe joint.

According to the second aspect of the present invention, in addition to the effects of the first aspect, the annular seal body is provided with a base fitted to the male pipe and protruded from the base to insert the female pipe. At the time of insertion of the female tube, because it is elastically deformed to allow the bead hook portion to enter, and at the same time, the seal lip portion that restores the connected state of the male tube and the female tube and abuts on the bead hook portion. Even at the position where it interferes with the bead hook, it does not hinder the insertion of the female tube.

According to the third aspect of the invention, in addition to the effect of the second aspect, the seal lip portion of the annular seal body is gradually thinned from the base end toward the tip end. In the connection state of the female tube and the female tube, the degree of adhesion to the inner peripheral surface of the bead hook portion forming the open end of the female tube increases,
The sealing performance is improved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The same components as those in the related art will be described with the same reference numerals.

FIG. 1 is an external perspective view of a pipe joint 1 according to the present embodiment. This pipe joint 1 connects a male pipe 2 and a female pipe 4 and allows a refrigerant to flow inside the connected male pipe 2 and female pipe 4. More specifically, the configuration shown in FIG. You are.

As shown in FIG. 2, the connection end 3 of the male tube 2
At the open end 5 of the female tube 4 for receiving the gasket, a bead hook portion 6 formed by expanding the open end 5 into a flared shape is provided. On the other hand, on the outer peripheral surface of the connection end 3 of the male pipe 2,
An annular cage 7, an annular ring 8 housed in the cage 7, and an O-ring 10 are provided.

The cage 7 is fixed to the outer peripheral surface of the connection end 3 of the male pipe 2 by a bead 14 formed by bending the male pipe 2, and an opening 11 for allowing the bead hook 6 to enter and exit, and an annular shape A hook portion 12 that engages with the bead hook portion 6 via the spring 8.

The annular spring 8 housed in the cage 7 is formed by connecting the free ends of the coil springs to form an annular shape. As shown in FIGS. 2B and 2C, the bead hook portion is inserted when the female tube 4 is inserted. 6 and enter between the bead hook portion 6 and the hook portion 12. Therefore, the annular spring 8 engages the bead hook portion 6 and the hook portion 12, and can connect the female tube 4 and the male tube 2 to each other.

The O-ring 10 is mounted in an O-ring mounting groove 13 provided between the open end 9 of the connecting end 3 of the male pipe 2 and the cage 7 of the male pipe 2, and In the connected state of the tubes 4, the refrigerant flowing inside the male tube 2 and the female tube 4 is prevented from leaking to the outside.

In such a pipe joint 1, the male pipe 2 and the female pipe 4 are connected to each other to abut against the open end 5 of the female pipe 4, and the outer peripheral surface of the male pipe 2 and the inner peripheral surface of the female pipe 4 An annular seal body 15 for preventing foreign matter from entering between the male pipe 2
Is a feature of this embodiment. More specifically, the annular seal body 15 is formed of an elastically deformable soft resin, and has a base 16 fitted to the male tube 2 as shown in FIG. ,
And a seal lip portion 19 that is gradually thinner from the base end 17 toward the tip end 18. Therefore, as shown in FIG. 2B → FIG. 2C, the seal lip 19 of the annular seal body 15 is elastically deformed when the female tube 4 is inserted to allow the bead hook 6 to enter, and the male tube 2 and the female tube 4 And is brought into contact with the open end 5 of the female tube 4 (the inner peripheral surface of the bead hook 6).

According to the pipe joint 1 of the present embodiment, the male pipe 2
Annular seal body which abuts on the open end 6 of the female tube 4 in a connected state with the female tube 4 to prevent foreign matter from entering between the outer peripheral surface of the male tube 2 and the inner peripheral surface of the female tube 4. 15 to the male tube 2
Therefore, it is possible to prevent foreign matter from entering between the outer peripheral surface of the male tube 2 and the inner peripheral surface of the female tube 4. Therefore, the deterioration of the O-ring 10, the male pipe 2 and the female pipe 4
Of the pipe joint 1 and contributes to a longer life of the pipe joint 1.

Further, the annular seal 15 is elastically deformed at the time of insertion of the female pipe 4 to allow the bead hook 6 to enter, while the annular seal body 15 is inserted between the male pipe 2 and the female pipe 4. Since the seal lip portion 19 is restored in the connected state and abuts on the bead hook portion 6, the annular seal body 15 is located at a position where it interferes with the bead hook portion 6 when the female tube 4 is inserted. The insertion of the female tube 4 is smoothly performed without disturbing the insertion.

Further, since the seal lip 19 of the annular seal body 15 is gradually thinned from the base end 17 toward the tip end 18, the connection between the male pipe 2 and the female pipe 4 is The degree of adhesion to the inner peripheral surface of the bead hook portion 6 forming the open end 5 of the above is increased, and the sealing performance is improved.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a pipe joint according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a main part of the pipe joint of FIG. 1, showing a connection between a male pipe and a female pipe before inserting a female pipe (split drawing a), at the time of inserting a female pipe (split drawing b); This is the state (split diagram c).

FIG. 3 is a front view (split view a) and a cross-sectional view (split view b) showing the annular seal body.

FIG. 4 is a cross-sectional view showing a conventional pipe joint, in which a male pipe and a female pipe are connected before a female pipe is inserted (part a), when a female pipe is inserted (part b), ).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fitting 2 Male pipe 3 Connection end 4 Female pipe 5 Open end of female pipe 6 Bead hook 7 Cage 8 Annular spring 9 Open end of male pipe 10 O-ring 11 Opening 12 Hook part 15 Annular seal body 16 Base 17 Base end 18 Tip 19 Seal lip

Claims (3)

[Claims] 1. A female tube (4) for receiving a male tube (2).
A bead hook (6) formed by expanding the open end (5) into a flared shape is provided at the open end (5) of the male pipe (2). An annular cage (7) having an opening (11) allowing entry and exit of the bead hook (6) and a hook (12) is fixedly provided, and a female tube (7) is provided in the cage (7). At the time of insertion of 4), the bead hook (6) rides on the outer periphery of the bead hook (6) and enters between the bead hook (6) and the hook (12) to engage the bead hook (6) with the hook (12). An annular spring (8) for connecting the male pipe (2) and the female pipe (4) is provided, and a cage (7) of the male pipe (2) and a connection end (3) of the male pipe (2) are provided. Between the outer peripheral surface of the male tube (2) and the inner peripheral surface of the female tube (4) between the open end (9) of the male tube and the female tube. In the pipe joint (1) equipped with an O-ring (10) for preventing the fluid flowing inside 4) from leaking, the male pipe (2) and the female pipe (4) are connected with the male pipe (2) in a connected state. An annular seal body (15) that abuts on the open end (5) to prevent foreign matter from entering between the outer peripheral surface of the male tube (2) and the inner peripheral surface of the female tube (4) is attached to the male tube (15). 2) A pipe fitting characterized by being attached to 2). 2. An annular seal (15) comprising a male pipe (2).
A base (16) fitted into the female pipe (4), which is elastically deformed when the female pipe (4) is inserted to allow the bead hook (6) to enter, while the male pipe (2) and the female pipe are inserted. 2. The pipe joint according to claim 1, further comprising a sealing lip (19) restoring the connection with the pipe (4) and resting on the open end (5) of the female pipe (4). 3. The tube according to claim 2, wherein the sealing lip (19) of the annular sealing body (15) is progressively thinner from the proximal end (17) to the distal end (18). Fittings.