JPH11236990A - Self-seal type double union joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To open or close inner and outer pipe passages without introducing the outside air by arranging the contact seal sections of a first moving valve and a second outer bushing after a first tubular partition wall contacts a second moving valve, the first moving valve contacts the second outer bushing, and a second tubular partition wall contacts an inner tube moving valve. SOLUTION: An outer bushing 21 is inserted into an outer bushing 11, a tubular partition wall 12 and a tubular partition wall 22 are brought into contact with an inner tube moving valve 31 and a moving valve 41 respectively, and a nut 9 is spirally advanced, then the moving valve 41 is retreated by the partition wall 12, and a moving valve 51 is retreated by the tip section of the outer bushing 21. When the nut 9 is continuously advanced, a passage 2 is communicated after the tip section of the partition wall 12 passes through an outer pipe passage 2 formed with the inner wall of the outer bushing 21 and the outer wall of the moving valve 41. When the outer bushings 11, 21 are kept in contact with each other, the contact faces between the partition walls 12, 22 and the moving valves 31, 41 are closely stuck, the outer bushings 11, 21, moving valves 51, 41, partition walls 12, 22, and moving valve 31 are sealed, thus between the inner and outer pipe passages 1, 2 and between them and the outsides of the outer bushings 11, 21 are cut off. The inner and outer pipe passages 1, 2 can be concurrently closed without introducing the outside air into them by connecting the outer bushings 11, 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable valve which has a cylindrical partition wall fixed in a pair of outer cylinders to form a double inner / outer passage, and which is biased toward the distal end by a spring device. And a seal member is interposed between the cylindrical partition wall and the cylindrical partition wall, and by combining a pair of outer cylinders, the cylindrical partition wall presses the movable valve to independently form the inner pipe passage and the outer pipe passage. The present invention relates to a self-sealing double-pipe joint that allows communication, and is used as a high-low pressure refrigerant cycle pipe for a separate type air conditioner, a hydraulic pipe in a hydraulic circuit, a fuel supply pipe, and the like.

[0002]

2. Description of the Related Art A double pipe joint of this type is disclosed in
The ones disclosed in JP-A-1-161619 and JP-A-5-30687 are known. In these known joints, by connecting male and female outer cylinders, the movable valve disposed outside the cylindrical partition wall is retracted, and the outer pipe passage is communicated,
The inner pipe passage communicates by retracting both valve stems by abutting the valve stems urged toward the distal end inside the two cylindrical partition walls. Therefore, when the male and female outer cylinders are brought into contact with each other, the movable valve on the outer pipe passage side and the outer sleeve wall come into contact with each other, but the protruding valve rods forming the inner pipe passage are still pressed together. Therefore, a space must be formed in the abutting portion to maintain the protruding state of the valve stem. If the nut is tightened in this state, the movable valve retreats and communicates with the outer pipe passage as it is, but at this stage, the air stagnating in the inner pipe passage opposing portion loses the escape place, The valve stems recede from each other while being inserted, and the inner pipe communicates. When such a double-pipe joint is used in the above-described air conditioner, hydraulic circuit, or fuel supply pipe, air mixes with the fluid in the pipe when the inner pipe is in communication, which causes inconvenience. In particular, in the case of a joint of a refrigerant cycle pipe for a separate type air conditioner, the moisture in the air may freeze and the air conditioner may become unusable.

[0003]

SUMMARY OF THE INVENTION In the present invention, a pair of outer casings 11, 21 is fixed with cylindrical partition walls 12, 22 to form inner and outer dual inner pipe passages 1 and 2, respectively. The movable valves 31, 41, 51 urged toward the distal end by the spring device are arranged with a sealing member interposed between the outer wall and the cylindrical partition wall, and the pair of outer tubes 11, 21 are combined. In a self-sealing double pipe joint in which the cylindrical partition walls 12, 22 press the movable valves 31, 41, 51 so that the inner pipe passage 1 and the outer pipe passage 2 communicate with each other independently,
It is an object of the present invention to connect a pair of jackets so that they can be simultaneously opened and closed without mixing outside air (air) into the passage of the inner and outer tubes.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a tubular partition wall 1;
Before the movable valves 31, 41, 51 come into contact with the movable valves 2, 22 and the respective contact sealing portions of the inner pipe passage 1 and the outer pipe passage 2 are shut off from the outside air, the outside air inside the contact sealing section stays. It is characterized in that it is configured to flow out of the cylindrical partition walls 12 and 22 without the need. With this configuration, when the outer pipe passage 2 and the inner pipe passage 1 communicate with each other, it is possible to prevent outside air from being mixed into the outer pipe passage 2 and the inner pipe passage 1. As a result, when connecting the double pipe joint, it is possible to realize a pipe joint that can prevent external leakage of the fluid in the piping system and ensure the purity of the fluid in the piping system. Further, in the present invention, the pair of outer cylinders 11 and 21 are used as the female outer cylinder 11 and the male outer cylinder 21, and the male and female outer cylinders 11 and 21 are fitted to each other. An opening of a flow path 24 communicating with the inner pipe passage 1 is provided on the side wall of the cylindrical partition wall 22 so as to close the distal end 23 of the cylindrical partition wall 22. The flow path 24 is closed by disposing a cylindrical movable valve 41 so as to face the outer wall 2, and a gap 42 is formed between the outside of the rear part of the movable valve 41 and the inner wall of the outer casing 21 so that the outer pipe passage 2 is exposed. In the female outer cylinder 11, a cylindrical movable valve 51 is provided outside the cylindrical partition wall 12 so as to face the distal end of the male outer cylinder 21.
Is formed, and a gap 13 is formed between the cylindrical partition wall 12 and the inner wall of the movable valve 51 so that the outer pipe passage 2 faces.
A flow path 3 communicating with the inner pipe passage 1 on the side wall is provided inside the distal end portion 2.
The movable valve 31 having the opening 2 is disposed so as to face the distal end surface 23 of the cylindrical partition wall 22 in the male outer cylinder 21, and the movable valve 3 is provided.
1 is characterized in that a bulging portion 33 is formed behind the flow path 32 to form an inner pipe passage 1 and an outer pipe passage 2.
With this configuration, it is possible to reliably prevent fluid leakage at the time of coupling / communication and separation of the double pipe joint.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. The drawing shows a joint used in a refrigerant cycle tube for a separate type air conditioner. The connection of the pair of outer cylinders will be described below with reference to the joints shown in FIGS. 1, 2, and 3. In the inner pipe passage 1, the cylindrical partition wall 2 in the male outer cylinder 21
The front end 23 is closed, and the side wall thereof is provided with a flow path 24 communicating with the inner pipe passage 1. The opening is biased toward the front end by a spring device (called a spring) 44 and disposed. Covered by a cylindrical movable valve 41,
The inner pipe passage 1 maintains the closed state. Note that the cylindrical movable valve 41 is disposed so as to face the distal end surface of the partition wall 12 in the female jacket 11. On the other hand, on the female outer cylinder 11 side, a movable valve 31 having an opening of a flow path 32 communicating with the inner pipe passage 1 is provided on a side wall inside a distal end portion of a cylindrical partition wall 12 fixed to the cylinder. I have. The movable valve 31 is urged on the distal end side by a spring 34, and a bulging portion 33 is formed behind the opening of the flow path 32. When the male outer cylinder 21 is advanced into the female outer cylinder 11 to bring the partition wall 22 into contact with the movable valve 31 (see FIG. 2) and the nut 9 is spirally advanced, the partition wall 22 of the male outer cylinder 21 is moved. Moves the movable valve 31 of the female outer cylinder 11 backward, and the partition wall 12 of the female outer cylinder 11 retracts the cylindrical movable valve 41 of the male outer cylinder 21. If the forward movement of both partition walls is still continued, the bulging portion 33 is formed on the rear side of the movable valve 31, so that the space between the partition wall 12 and the bulging portion 33 is increased by the retraction. At the stage when the opening of the flow path 24 of the partition wall 22 of the male outer cylinder 21 reaches the gap formed on the inner wall of the partition wall 12 of the female outer cylinder 11. The passages 1 and 1 communicate with each other (see FIG. 3).

In the outer pipe passage 2, a gap 42 is formed between the rear outer side of the male outer cylinder 21 and the inner wall of the outer cylinder 21 so as to face the outer pipe passage. However, in a state where the movable valve 41 is advanced, it has a function of closing the inner pipe passage 1 and simultaneously closing the outer pipe passage 2. On the outer side of the partition wall 12 of the female outer cylinder 11, a cylindrical movable valve 51 urged toward the distal end by a spring 54 is disposed so as to face the distal end portion of the male outer cylinder 21. Since the partition wall 12 is thin except for the end portion, a gap 13 is formed between the partition wall 12 and the inner wall of the movable valve 51 so that the outer pipe passage 2 is exposed. Therefore, the outer pipe passage 2 is kept closed while the tubular movable valve 51 is in the forward state. When the male outer cylinder 21 is advanced into the female outer cylinder 11, the partition walls 12, 22 and the movable valves 31, 41 are respectively brought into contact with each other, and the nut 9 is spirally advanced, as described above. The eleventh partition wall 12 retracts the cylindrical movable valve 41 of the male outer cylinder 21, and the cylindrical movable valve 51 in the female outer cylinder 11 is retracted by the distal end of the male outer cylinder 21.
When the forward movement of both partition walls 12 and 22 is continued, the distal end of the partition wall 12 of the female outer cylinder 11 is connected to the outer pipe passage 2 formed by the inner wall of the male outer cylinder 21 and the outer wall of the movable valve 41. At the stage of passing, the male and female outer pipe passages 2 communicate (see FIG. 3).

When the male and female outer cylinders 11 and 21 are in contact with each other, that is, immediately before the nut is spirally advanced, the partition wall 1 is closed.
Since the contact surfaces between the movable valves 2 and 22 and the movable valves 31 and 41 are closely contacted, no gap is generated. Further, the male and female outer cylinders, the cylindrical movable valve, the partition wall, and the central movable valve are sealed between the inner and outer passages and between the inner and outer passages and the outside of the outer sleeves 11 and 21 because the mutual contact portions are sealed. Will be completely shut off. Therefore, the male and female outer cylinders 11 and 21 can be connected and simultaneously closed without mixing air into the passages of the inner and outer tubes.

The partition walls 12, 22 in the male and female outer cylinders 11, 21 shown in the drawings are supported by connecting branch pipes 4, 5, which are fixed to the rear ends of the respective outer cylinders 11, 21. I have. The inner pipe passage 1 and the outer pipe passage 2 are connected to the high-pressure pipe 6 and the low-pressure pipe 7 via the connection branch pipes 4 and 5, respectively. In addition to the connecting branch pipe shown in FIG. 1, a known branch structure, for example, the same cap body disclosed in Japanese Utility Model Application Laid-Open No. 5-30687 listed at the beginning can be used. In order to provide a space between the high-pressure pipe and the low-pressure pipe in order to interpose a heat insulating material, the branch connecting pipe 4
In 5, it is necessary to displace the high-pressure pipe to its peripheral side. The partition walls 12, 22 can of course be fixed in the outer cylinder by another support regardless of the connecting branch pipes 4, 5.

As the seal between the outer cylinder, the movable valve and the partition wall, a rubber O-ring can be suitably used, but it is necessary to provide different seals according to the assembly process of the joint and the like. For example, the high and low pressure pipes 6, 7 are connected to the connecting branch pipes 4, 5,
A high temperature state occurs when fixing is performed by brazing or the like. In the joint shown in FIG. 1, the partition wall 12 and the connecting branch pipe 4
A metal seal 35 is interposed between them so as to withstand the high temperature generated in a later brazing step. When the male and female outer cylinders are connected, the seals 15 and 45 are exposed in the outer pipe passage 2 and are exposed to the pressure fluid. To prevent it from falling off.

In FIG. 1, the movable valve 41 of the male outer cylinder 21 urged to the distal end side by the spring 44 forms a projection 43 on the outside of the valve body as shown in FIG. Although a configuration is adopted in which the small diameter step 3 formed on the sleeve 21 is engaged, an engagement step may be formed on the partition wall 22 and engaged therewith (see FIG. 12). In FIG. 4, a configuration is used in which a gap 42 is formed between the projections 43 and 43 and the inner wall of the male outer cylinder 21 so that the outer pipe passage 2 is exposed. Movable valve 4 when engaging
The outer pipe passage 2 can be exposed by forming a cutout recess in the rear outer wall 1 (see FIG. 13). The movable valve 51 of the female jacket 11 urged toward the distal end by the spring 54 shown in FIGS. 1 and 2 is engaged with the bulging step 14 formed at the distal end of the partition wall 12. However, it is also possible to adopt a configuration in which a step is provided on the inner wall of the female outer sleeve 11 and the step is engaged with the step (see FIG. 14). Therefore, the design of the engagement portion and the shape of each movable valve can be changed as long as the operation of the present invention is not changed. In addition,
The flow paths 24 and 32 provided on the side wall of the distal end portion of the partition wall 22 and the side wall of the movable valve 31 are formed by through holes in the drawing. The flow path can also be opened in the side wall by fixing a circular plate having a diameter equal to that of a small distance with the support piece (see FIG. 15).

In the joint shown in FIG. 1, a cylindrical projection is extended from the small-diameter stepped portion 3 of the male outer cylinder 21, and its tip is formed on the outer wall of the movable valve 51 in the female outer cylinder 11. 52, but the male jacket 21 is connected to the movable valve 51.
5 and 6 can be adopted by changing the design. FIG. 5 shows that the distal end surface of the male jacket 21 is connected to the distal end surface 23 of the partition wall 22 and the movable valve 4.
1 is formed flush with the front end surface of the first. The joint having this configuration has an advantage that the joint structure is simple and the number of seal locations can be reduced. FIG. 6 shows a configuration in which the distal end portion of the male outer cylinder 21 and the movable valve 51 are abutted face to face, and a rubber plate 55 is provided on the front surface of the movable valve 51 and a rubber plate is provided on the front surface of the movable valve 41. 56 are fixedly provided and sealed at locations facing each other. Therefore, there is an advantage that the sealing structure can be further simplified and the elastic ring exposed to the pressure fluid can be eliminated.

Although the seal made of the elastic ring may be deteriorated if it is kept in contact with the refrigerant for the air conditioner for a long period of time, as shown in FIGS. By forming the movable wall 61 facing the distal end surface of the wall 12 and the valve wall 62 which is urged to the distal end outside the movable wall 61 and retreats as the movable wall 61 retreats, the seal is formed on the outer pipe passage surface. It can be protected from exposure. That is, the movable wall 61 and the valve wall 62 are urged toward the distal end by the springs 44a and 44b, respectively. A projection (not shown) similar to the projection 43 of the movable valve 41 shown in FIG. 4 is projected from the outside of the valve wall 62 and is engaged with the small-diameter step portion of the outer cylinder 21. Locking part 6 at rear end
3 is locked to the rear end face of the valve wall. The movable wall 61 is pushed by the distal end surface of the cylindrical partition wall 12 and is retracted. However, when the movable wall 61 is still pushed, the movable wall 61 is engaged with the valve wall 62 and the valve wall 62 is retracted. At this time, the O-ring 45 fitted in the concave groove on the outer periphery of the distal end of the movable wall is attached to the valve wall 62.
The O-ring 15 covered by the O-ring 15 and fitted into the groove at the outer periphery of the distal end of the cylindrical partition wall 12 is also located inside the valve wall 62, so that the retreat is completed and the outer pipe passage communicates. At this stage, both O-rings 45 and 15 are not exposed. 7 and 8 show the shape of the distal end of the outer cylinder 21 in FIG.
However, the movable wall 61, the valve wall 62, and the distal end portion 23 of the partition wall are positioned slightly inward, and the partition wall 12 and the movable valve on the female jacket 11 side are arranged. 31 is projected outward. 9 and 10 show a shape of the distal end portion of the outer cylinder 21 substantially similar to that of the embodiment shown in FIG.

In each of the joints shown in FIGS. 1 to 10, the outer jackets in which the outer wall of the male outer jacket and the outer jacket of the female are closely taper-fitted are directly metal-sealed. This is because even if the refrigerant passes through the O-ring as the sealing material, the metal functions as a seal to prevent the refrigerant from diffusing to the outside of the joint. This sealing function can be achieved by using a separate metal seal ring if taper fitting is not performed. Of course, when there is no possibility that the O-ring is permeable to the refrigerant, it is not necessary to provide a metal sealing material at the contact portion between the male and female jackets.

In the above embodiment, the inside of the male jacket 2
A movable valve 31 for opening and closing the inner pipe passage 1 of the female outer cylinder by fixing the first partition wall 22 is pressed, and the partition wall 12 fixed in the female outer sleeve 11 opens and closes the outer pipe passage 2. Although the configuration in which the cylindrical movable valve 41 is pressed is adopted, it goes without saying that the same action can be obtained even if the configuration in the male and female outer cylinders is reversed. In the above embodiment, the inner pipe passage 1 is connected to the high-pressure pipe 6 and the outer pipe passage 2 is connected to the low-pressure pipe 7. However, as shown in FIGS. 16 and 17, the inner pipe passage 1 is connected to the low-pressure pipe. Alternatively, the outer pipe passage 2 may be connected to a high-pressure pipe.
In the above embodiment, the nut 9 provided on the outer side of the female outer casing 11 is screwed to the screw 8 formed on the outer side of the male outer casing 21. Male and female flange configurations, the easily removable male and female one-touch coupling configurations shown in FIGS. 20 and 21, and the male and female one-touch connection type configurations shown in FIGS. A double pipe joint may be connected. In the above embodiment, the high-pressure pipe 6 and the low-pressure pipe 7 are arranged side by side.
As disclosed in Japanese Patent No. 619, one pipe may be arranged so as to surround the other pipe.

The joint according to the present invention is a female jacket 1
1. One of the male outer casings 21 can be fixed to the main body side, for example, the indoor unit 71 or the outdoor unit 72 of the separate type air conditioner, or it can be connected and positioned in the middle of both. Can also. FIG. 11 shows the latter case. In the example of FIG. 11, a three-way valve 73 is connected to the low-pressure pipe 7 and a two-way valve 7 is connected to the high-pressure pipe 6 at the rear end of the male jacket 21.
4 are respectively provided. Therefore, when any trouble occurs, the operation of charging or replenishing the refrigerant gas or recovering and sealing the gas to the outdoor unit when disposing of the device can be easily performed.

[0016]

As described above, according to the self-sealing double pipe joint of the present invention, the cylindrical partition walls 12, 22 are fixed in the pair of outer cylinders 11, 21, and the inner and outer double inner pipes are fixed. A movable valve 3 having a passage 1 and an outer tube passage 2 urged toward the distal end by a spring device
1, 41, 51 are the outer jacket wall and the cylindrical partition wall 12,
22, a sealing member is interposed therebetween, and the pair of outer cylinders 11, 21 is combined to allow the cylindrical partition walls 12, 22 to press the movable valves 31, 41, 51 to form the inner partition. A self-sealing double pipe joint in which the pipe passage 1 and the outer pipe passage 2 are independently coupled and communicated with each other while the inner pipe passage 1 and the outer pipe passage 2 are separated from the outside air in a separated state. The cylindrical partition wall 1
Before the movable valves 31, 41 and 51 come into contact with each other and the respective contact sealing portions of the inner pipe passage 1 and the outer pipe passage 2 are cut off from the outside air, the outside air inside the contact sealing section is removed. The outer pipe passage 2 and the inner pipe passage 1 are configured to flow out of the tubular partition walls 12 and 22 without stagnation.
When communicating with each other, it is possible to prevent outside air from entering the inside of the outer pipe passage 2 and the inner pipe passage 1. as a result,
When connecting the double pipe joint, it is possible to realize a pipe joint that can prevent external leakage of the fluid in the piping system and ensure the purity of the fluid in the piping system. The present invention also provides a pair of outer cylinders 11,
Before the connection of the inner pipe passage 1 and the outer pipe passage 2 is made to communicate with each other, the distal end surfaces of the cylindrical partition walls 12 and 22 and the movable valve 3
Male and female outer cylinders 1 composed of the end surfaces of 1, 41 and 51
By making the contact surfaces in the first and the first 21 closely contact each other, the outside air that is to stay in the outer cylinders 11 and 21 is forcibly discharged to the outside of the outer cylinders 11 and 21, and the outside air is Mixing into the passage 1 and the outer pipe passage 2 can be reliably prevented. Further, in the present invention, the pair of outer cylinders 11 and 21 are a female outer cylinder 11 and a male outer cylinder 21, and the distal end surface of the male outer cylinder 21 is the distal end surface 23 of the partition wall 22 and the movable valve 41. By making the tip surface flush with the front end surface, the structure is simple, the number of sealing portions is reduced, and cost reduction and improvement in airtight reliability can be realized.

Further, according to the present invention, the pair of outer cylinders 11 and 21 is a female outer cylinder 11 and a male outer cylinder 21, and the male and female outer cylinders 11 and 21 are fitted. In addition to closing the distal end portion 23 of the cylindrical partition wall 22 in the inside 21, an opening of the flow path 24 communicating with the inner pipe passage 1 is provided on the side wall thereof, and the opening of the cylindrical partition wall 12 of the female jacket 11 is provided outside thereof. A cylindrical movable valve 41 is arranged so as to face the distal end surface to close the flow path 24, and a gap 42 is formed between the outside of the rear part of the movable valve 41 and the inner wall of the outer cylinder 21 to form the outer pipe passage 2. In the female outer casing 11, a cylindrical movable valve 51 is disposed outside the cylindrical partition wall 12 so as to face the distal end of the male outer cylinder 21, and the cylindrical partition wall 12 and the movable valve A gap 13 is formed between the outer pipe passage 2 and the inner wall of the outer pipe passage 51.
And a movable valve 31 provided with an opening of a flow path 32 communicating with the inner pipe passage 1 on the side wall inside the distal end portion of the cylindrical partition wall 12.
Is disposed so as to face the distal end surface 23 of the cylindrical partition wall 22 in the male outer jacket 21, and the bulging portion 3 is provided in the movable valve 31 behind the flow path 32.
By forming the inner pipe passage 1 and the outer pipe passage 2 by forming 3, it is possible to reliably prevent fluid leakage at the time of coupling / communication and separation of the double pipe joint. The present invention also provides
By sealing the contact portion between the male jacket 21 and the female jacket 11 with a metal seal, it is possible to prevent the contact portion from being deteriorated by the fluid to be sealed. Further, according to the present invention, the male outer cylinder 21 and the female outer cylinder 11 are taperedly fitted and sealed, so that it is possible to further improve the prevention of fluid leakage when the double pipe joint is connected. Further, the present invention urges the movable valve 41 toward the distal end side of the movable wall 61 facing the distal end surface of the cylindrical partition wall 12 and the movable wall 6.
1 and the valve wall 62 which retreats with the retreat, so that the seal portion is not exposed to the fluid passage surface, so that there are many excellent effects such as the durability of the seal portion can be improved. It is.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a joint according to the present invention before joining.

FIG. 2 is a longitudinal sectional view of the joint according to the present invention in the middle of joining.

FIG. 3 is a longitudinal sectional view after the joint according to the present invention has been joined.

FIG. 4 is a right side view of the movable valve of the male jacket.

FIG. 5 is a longitudinal sectional view of a joint according to another embodiment before joining.

FIG. 6 is a longitudinal sectional view before joining of a joint according to still another embodiment.

FIG. 7 is a longitudinal sectional view before joining of a joint that does not expose an O-ring to a passage at the time of connection.

8 is a longitudinal sectional view of the joint of FIG. 7 after joining.

FIG. 9 is a longitudinal sectional view before joining of another joint that does not expose the O-ring to the passage at the time of connection.

FIG. 10 is a longitudinal sectional view after the joint of FIG. 9 is joined.

FIG. 11 is an overall schematic diagram of a separate type air conditioner.

FIG. 12 is a partial cross-sectional view of another embodiment of the movable valve 41 and the cylindrical partition wall 22 of FIG.

FIG. 13 is an external view of still another embodiment of the movable valve 41 of FIG.

FIG. 14 is a partial cross-sectional view of still another embodiment of the movable valve 51 and the cylindrical partition wall 12 of FIG.

FIG. 15 is a partial cross-sectional view of still another embodiment of the movable valve 41 and the cylindrical partition wall 22 of FIG.

FIG. 16 is a longitudinal sectional view of a joint according to yet another embodiment before joining.

17 is a longitudinal sectional view after the joint of FIG. 16 is joined.

FIG. 18 is a longitudinal sectional view of a joint according to yet another embodiment before joining.

19 is a longitudinal sectional view after the joint of FIG. 18 is joined.

FIG. 20 is a longitudinal sectional view of a joint according to yet another embodiment before joining.

21 is a longitudinal sectional view after the joint of FIG. 20 is joined.

FIG. 22 is a longitudinal sectional view of a joint according to yet another embodiment before joining.

FIG. 23 is a longitudinal sectional view after the joint of FIG. 22 is joined.

[Explanation of symbols]

 Reference Signs List 1 inner pipe passage 2 outer pipe passage 4, 5 connecting branch pipe 6 high-pressure pipe 7 low-pressure pipe 8 screw 9 nut 11 female outer cylinder 12 female-side partition wall 13, 42 gap 21 male outer sleeve 22 male-side partition wall 23 male Side partition wall tip (surface) 24, 32 Flow path 31 Inner pipe movable valve 41, 51 Cylindrical movable valve 61 Movable wall 62 Valve wall 63 Locking unit 71 Indoor unit 72 Outdoor unit 73 Three-way valve 74 Two-way valve

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[Procedure amendment]

[Submission date] September 30, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Self-sealing double pipe joint

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable valve which has a cylindrical partition wall fixed in a pair of outer cylinders to form a double inner / outer passage, and which is biased toward the distal end by a spring device. And a seal member is interposed between the cylindrical partition wall and the cylindrical partition wall, and by combining a pair of outer cylinders, the cylindrical partition wall presses the movable valve to independently form the inner pipe passage and the outer pipe passage. The present invention relates to a self-sealing double-pipe joint that allows communication, and is used as a high-low pressure refrigerant cycle pipe for a separate type air conditioner, a hydraulic pipe in a hydraulic circuit, a fuel supply pipe, and the like.

[0002]

2. Description of the Related Art A double pipe joint of this type is disclosed in
The ones disclosed in JP-A-1-161619 and JP-A-5-30687 are known. In these known joints, by connecting male and female outer cylinders, the movable valve disposed outside the cylindrical partition wall is retracted, and the outer pipe passage is communicated,
The inner pipe passage communicates by retracting both valve stems by abutting the valve stems urged toward the distal end inside the two cylindrical partition walls. Therefore, when the male and female outer cylinders are brought into contact with each other, the movable valve on the outer pipe passage side and the outer sleeve wall come into contact with each other, but the protruding valve rods forming the inner pipe passage are still pressed together. Therefore, a space must be formed in the abutting portion to maintain the protruding state of the valve stem. If the nut is tightened in this state, the movable valve retreats and communicates with the outer pipe passage as it is, but at this stage, the air stagnating in the inner pipe passage opposing portion loses the escape place, The valve stems recede from each other while being inserted, and the inner pipe communicates. When such a double-pipe joint is used in the above-described air conditioner, hydraulic circuit, or fuel supply pipe, air mixes with the fluid in the pipe when the inner pipe is in communication, which causes inconvenience. In particular, in the case of a joint of a refrigerant cycle pipe for a separate type air conditioner, the moisture in the air may freeze and the air conditioner may become unusable.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a first mantle.
While fixing the first cylindrical partition wall 12 in the cylinder 11,
The second cylindrical partition wall 22 is fixed in the outer jacket 21 of the above, and the inner and outer dual inner pipe passages 1 and 2 are formed respectively .
The first movable valve 5 urged toward the distal end by the first spring device 54
1 between the first mantle 11 wall and the first cylindrical partition wall 12
In addition, the inner tube movable biased toward the distal end by the third spring device 34
The valve 31 is mounted on the inner wall side of the first cylindrical partition wall 12 respectively.
The second spring device 4
The second movable valve 41 urged toward the distal end side at 4
Sea between the inner wall of the tube 21 and the second cylindrical partition wall 22
The first outer casing 11 and the second
By combining the outer envelope 21, the second outer envelope
21 is the first movable valve 51, and the second cylindrical partition wall 22 is the inside.
The pipe movable valve 31 is connected to the first cylindrical partition wall 12 by the second movable valve.
In the self-sealing double pipe joint in which the inner pipe passage 1 and the outer pipe passage 2 are independently connected by pressing the inner pipe passage 41, the pair of the first outer cylinder 11 and the second outer jacket
It is an object of the present invention to connect the cylinder 21 so that it can be simultaneously opened and closed without mixing outside air (air) into the passage of the inner and outer pipes.

[0004]

SUMMARY OF THE INVENTION The present invention provides a first cylindrical section.
The image wall 12 contacts the second movable valve 41 and the first movable valve 5
1 comes into contact with the second outer cylinder 21 and the second cylindrical partition wall 22
Abuts against the inner pipe movable valve 31, respectively, and then the inner pipe passage 1 and
The first movable valve is connected until the outer pipe passage 2 and the outer pipe passage 2 communicate with each other.
51 and a small amount of outside air surrounded by the second mantle 21.
At least most should be discharged outside the second mantle 21.
And at least the first movable valve 51 and the second mantle 21
Are arranged and configured . With this configuration, when the outer pipe passage 2 and the inner pipe passage 1 communicate with each other, it is possible to prevent outside air from being mixed into the outer pipe passage 2 and the inner pipe passage 1. As a result, when connecting the double pipe joint, it is possible to realize a pipe joint that can prevent external leakage of the fluid in the piping system and ensure the purity of the fluid in the piping system. In the present invention, the first mantle 11 is a female mantle.
The cylinder and the second jacket 21 are male-type jackets , and the first jacket is
While the cylinder 11 and the second outer cylinder 21 are fitted, the distal end portion 23 of the second cylindrical partition wall 22 in the second outer cylinder 21
The opening of the passage 24 communicating with the inner pipe passage 1 in the side wall thereof with closing provided, first of the first jacket tube 11 on the outside
A first cylindrical partition wall 12 is opposed to the distal end surface of the first cylindrical partition wall 12 .
The second movable valve 41 the passage 24 closed by placing outside to form a gap 42 between the rear outside and the second jacket tube 21 the inner wall of the second variable <br/> valve train 41 With the pipe passage 2 facing, the first mantle 1
1 has a second outer cylinder 2 outside the first cylindrical partition wall 12.
Opposite the first distal end portion disposed first movable valve 51 cylindrical, outer tube to form a gap 13 between the inner wall of the first cylindrical partition wall 12 and the first movable valve 51 The inner pipe movable valve 31 having the opening of the flow path 32 communicating with the inner pipe passage 1 is provided on the side wall inside the distal end of the first cylindrical partition wall 12 facing the passage 2.
The inner tube movable valve 31 is provided with a bulging portion 33 behind the flow path 32 so as to face the distal end surface 23 of the second cylindrical partition wall 22 in the outer tube 21. 1 and the outer pipe passage 2 are configured. With this configuration, it is possible to reliably prevent fluid leakage at the time of coupling / communication and separation of the double pipe joint.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. The drawing shows a joint used in a refrigerant cycle tube for a separate type air conditioner. The connection of the pair of outer cylinders will be described below with reference to the joints shown in FIGS. 1, 2, and 3. In the inner tube passageway 1, first in the second jacket tube 21 of the male 2
The distal end portion 23 of the cylindrical partition wall 22 is closed, and a flow path 24 communicating with the inner pipe passage 1 is provided on the side wall thereof, and the opening thereof is provided with a second spring device (referred to as a spring) 44.
The inner pipe passage 1 is kept closed by being covered by the cylindrical second movable valve 41 arranged to be biased toward the distal end side. The second movable valve 41 the tubular of female
It is arranged to face the distal end surface of the first cylindrical partition wall 12 in the first outer cylinder 11. On the other hand , the female first mantle 11
On the side, an inner pipe movable valve 31 provided with an opening of a flow path 32 communicating with the inner pipe passage 1 on the side wall is disposed inside the distal end of the first cylindrical partition wall 12 fixed to the cylinder. . The inner valve 31 is biased on the distal end side by a third spring 34, and a bulge 33 is formed behind the opening of the flow path 32. The second outer cylinder 21 is advanced into the first outer cylinder 11 to bring the second cylindrical partition wall 22 into contact with the inner pipe movable valve 31 (see FIG. 2), and the nut 9 is spirally advanced. When,
The second cylindrical partition wall 22 of the second outer cylinder 21 retreats the inner tube movable valve 31 in the first outer cylinder 11, and the first outer cylinder 1
The first first cylindrical partition wall 12 has a cylindrical shape of the second outer cylinder 21.
The second movable valve 41 is retracted. 1st cylindrical
If the partition wall 12 and the second cylindrical partition wall 22 continue to advance, the bulging portion 33 is formed on the rear side of the inner pipe movable valve 31. Only the thickness of
A gap is gradually formed between the first cylindrical partition wall 12 and
It reaches the gap opening of the channel 24 of the second cylindrical partition wall 22 of the second jacket tube 21 is formed on the inner wall of the first cylindrical partition wall 12 of the first mantle tube 11 At this stage, the male and female inner pipe passages 1, 1 communicate with each other (see FIG. 3).

[0006] In the outer tube passage 2, the second movable valve 41 of the tubular within the second jacket tube 21 is a rear outside and second
4 with the outer tube passage facing the inner wall of outer jacket 21
The second movable valve 41 functions to block the inner pipe passage 1 and simultaneously close the outer pipe passage 2 when the second movable valve 41 is advanced. Also, the first mantle 11
In the outside of the first cylindrical partition wall 12, a first movable valve 51 with a cylindrical biasing distally by the first spray <br/> ring 54 of the second jacket tube 21 tip It is arranged facing the part. Since the first cylindrical partition wall 12 is thin except for the distal end portion, a gap 13 is formed between the first cylindrical partition wall 12 and the inner wall of the first movable valve 51 so that the outer pipe passage 2 faces. Therefore, the outer pipe passage 2 is kept in a closed state in a state in which the first tubular movable valve 51 is advanced. The second mantle tube 21 is advanced into the first mantle tube 11 so that the first cylindrical section is formed.
Picture wall 12, second cylindrical partition wall 22 and inner pipe movable valve 31,
When the second movable valve 41 is brought into contact with each other and spirally advanced with the nut 9, as described above, the first outer cylinder 11 has the first
The cylindrical partition wall 12 to retract the second variable <br/> valve train 41 cylindrical second mantle tube 21, a cylindrical first in first mantle tube 11
The movable valve 51 is retracted by the distal end of the second outer cylinder 21. First cylindrical partition wall 12 and second cylindrical partition wall
When still continued advancement of 22, first the first mantle tube 11
Tip of the cylindrical partition wall 12 and the second jacket tube 21 inner wall first
The male and female outer pipe passages 2 communicate with each other at the stage where they have passed the outer pipe passage 2 formed by the outer wall of the movable valve 41 (see FIG. 3).

When the first outer cylinder 11 and the second outer cylinder 21 are in contact with each other, that is, immediately before the nut is spirally advanced, the first cylindrical partition wall 12 and the second cylindrical partition Wall 22 and inside
Since the contact surfaces between the pipe movable valve 31 and the second movable valve 41 are close to each other, no gap is generated. In addition, the
The first outer cylinder 11 and the second outer cylinder 21, a first movable cylinder
The valve 51 and the second movable valve 41, the first cylindrical partition wall 12 and the second
The two cylindrical partition walls 22 and the central inner pipe movable valve 31 are sealed between the inner and outer passages and between the inner and outer passages and the first outer sleeve 11 and the second outer sleeve 21 because the mutual contact portions are sealed. Will be completely shut off from the outside. Therefore, the first mantle
The cylinder 11 and the second outer cylinder 21 are connected, and can be simultaneously closed without mixing air into the passages of the inner and outer pipes.

[0008] In the first jacket 11 shown in the drawing and the second
The first cylindrical partition wall 12 and the second cylinder in the outer cylinder 21
The partition wall 22 includes a first outer cylinder 11 and a second outer cylinder 21.
Are supported by connecting and branching pipes 4 and 5 fixed to the rear end. The inner pipe passage 1 and the outer pipe passage 2 are connected to the high-pressure pipe 6 and the low-pressure pipe 7 via the connection branch pipes 4 and 5, respectively. This connecting branch pipe is the one shown in FIG.
A known branch structure, for example, the same one as the cap body disclosed in Japanese Utility Model Laid-Open No. 5-30687 listed at the beginning can be used. In order to provide a space between the high-pressure pipe and the low-pressure pipe in order to interpose a heat insulating material, it is necessary to displace the high-pressure pipe in the branch connection pipes 4 and 5 to the peripheral side thereof. The first cylindrical partition wall 12 and the second cylindrical partition wall
22 can, of course, be fixed in the outer cylinder by another support regardless of the connecting branch pipes 4, 5.

As the seal between the outer cylinder, the movable valve and the cylindrical partition wall, a rubber O-ring can be preferably used, but it is necessary to provide different seals in accordance with the joint assembling process and the like. . For example, connecting the high and low pressure pipes 6 and 7 to the connecting branch pipe 4,
In the case where it is fixed to 5 by brazing or the like, a high temperature state occurs. In the joint shown in FIG. 1, a metal seal 35 is interposed between the first cylindrical partition wall 12 and the connecting branch pipe 4 so as to withstand high temperatures generated in a later brazing process. When the male and female outer cylinders are connected, the seals 15 and 45 are exposed in the outer pipe passage 2 and are exposed to the pressure fluid. To prevent it from falling off.

[0010] In Figure 1, a second movable valve of the second jacket tube 21, which is biased distally by a second spring 44 4
1 adopts a configuration in which a projection 43 is formed on the outside of the valve body as shown in FIG. 4 and this is engaged with the small-diameter stepped portion 3 formed in the second outer cylinder 21 . 2 cylindrical partition wall 2
Alternatively, an engaging step may be formed at 2 to be engaged (see FIG. 12). FIG. 4 employs a configuration in which a gap 42 is formed between the projections 43 and 43 and the inner wall of the second outer cylinder 21 so as to face the outer pipe passage 2.
When the second movable valve 4 is engaged with the cylindrical partition wall 22 of FIG.
The outer pipe passage 2 can be exposed by forming a cutout recess in the rear outer wall 1 (see FIG. 13). The first movable valve 51 of the first mantle tube 11 which is urged distally by the first spring 54 shown in FIGS. 1 and 2
Is engaged with the bulging step 14 formed at the distal end of the first cylindrical partitioning wall 12, but is engaged with the step by providing a step on the inner wall of the first outer casing 11. It is also possible to adopt a configuration for causing the above (see FIG. 14). Therefore, the design of the engagement portion and the shape of each movable valve can be changed as long as the operation of the present invention is not changed. The second cylindrical partition wall 2
The flow paths 24 and 32 provided on the side wall of the distal end portion 2 and the side wall of the inner pipe movable valve 31 are constituted by through holes in the drawing.
Can be opened to the flow passage in the side wall also by the disc diameter equal from the tip portion of the cylindrical ku Ekabe and inner tube movable valve 31 to an outer diameter providing a slight distance fixed by the support piece ( See FIG. 15).

[0011] In the joint of Figure 1, the second jacket tube 21
A cylindrical projection is extended from the small-diameter stepped portion 3 of FIG .
A configuration is adopted in which a step 52 formed on the outer wall of the first movable valve 51 in the outer cylinder 11 is abutted, but the second outer cylinder 21 abuts on the first movable valve 51. The structure to be changed can be changed in design and the structure as shown in FIGS. 5 and 6 can be adopted. FIG. 5 shows a state in which the distal end surface of the second
It is configured to be flush with the distal end surface 23 of the cylindrical partition wall 22 and the distal end surface of the second movable valve 41. The joint having this configuration has an advantage that the joint structure is simple and the number of seal locations can be reduced. FIG. 6 shows a configuration in which the distal end portion of the second outer cylinder 21 and the first movable valve 51 are abutted face to face, and a rubber plate 55 is provided on the front surface of the first movable valve 51. No.
A rubber plate 56 is fixedly provided on the front surface of the second movable valve 41, and seals are provided at locations facing each other. Therefore, there is an advantage that the sealing structure can be further simplified and the elastic ring exposed to the pressure fluid can be eliminated.

[0012] Although the seal made of an elastic ring may be degraded when placed in contact prolonged and the coolant for the air conditioner, as shown in FIGS. 7 to 10, a second movable valve 41 The movable wall 6 facing the front end surface of the first cylindrical partition wall 12
1 and the valve wall 62 which is urged to the distal end on the outside thereof and retreats as the movable wall 61 retreats, can prevent the seal from being exposed to the outer pipe passage surface. That is, the movable wall 61 and the valve wall 62 are urged toward the distal end by the springs 44a and 44b, respectively. A projection (not shown) similar to the projection 43 of the second movable valve 41 shown in FIG. 4 protrudes from the outside of the valve wall 62 and is engaged with the small-diameter step portion of the second outer cylinder 21. And movable wall 6
Reference numeral 1 denotes a state in which the locking portion 63 is locked to the rear end surface of the valve wall at the rear end. The movable wall 61 is the first cylindrical partition wall 12
The movable wall 61 is engaged with the valve wall 62 to retreat the valve wall 62 when the movable wall 61 is further pressed. At this time, the O-ring 45 fitted in the groove at the outer periphery of the distal end of the movable wall is covered by the valve wall 62, and at the same time, the O-ring fitted in the groove at the outer periphery of the distal end of the first cylindrical partition wall 12. Since both the O-rings 15 and 15 are located inside the valve wall 62, the O-rings 45 and 15 are not exposed at the stage where the retreat is completed and the outer pipe passage communicates. FIGS. 7 and 8 show the shape of the distal end of the second mantle 21 similar to that of the embodiment shown in FIG.
And slightly it is positioned inwardly of the valve wall 62 and the partition wall of the tip portion 23, a first cylindrical partition wall 12 and the first jacket tube 11 side
The inner pipe movable valve 31 is projected outward. 9 and 1
Reference numeral 0 indicates that the shape of the distal end of the second outer cylinder 21 is substantially the same as that of the embodiment shown in FIG.

[0013] FIGS in 10 joint, both the first mantle outer and the female of the second jacket tube made of metal male
The outer cylinders that are closely tapered fitted to the cylinders are directly metal-sealed. This is because even if the refrigerant passes through the O-ring as the sealing material, the metal functions as a seal to prevent the refrigerant from diffusing to the outside of the joint. This sealing function can be achieved by using a separate metal seal ring if taper fitting is not performed. Of course, when there is no possibility that the O-ring is permeable to the refrigerant, it is not necessary to provide a metal sealing material at the contact portion between the male and female jackets.

[0014] In the above embodiment, the first mantle tube by fixing the second cylindrical partition wall 22 of the second jacket tube 21
11 presses an inner pipe movable valve 31 for opening and closing the inner pipe passage 1, and the first cylindrical partition wall 12 fixed in the first outer cylinder 11 opens and closes the outer pipe passage 2. Although the configuration in which the cylindrical second movable valve 41 is pressed is adopted, it is needless to say that the same operation can be achieved even if the configuration in the male and female outer cylinders is reversed. In the above embodiment,
The inner pipe passage 1 was connected to the high-pressure pipe 6 and the outer pipe passage 2 was connected to the low-pressure pipe 7, but as shown in FIGS. 16 and 17, the inner pipe passage 1 was connected to the low-pressure pipe, and the outer pipe passage 2 was connected to the high-pressure pipe. They may be connected. In the above embodiment, the female first mantle 11
18 and FIG. 19, the nut 9 provided on the outside is screwed into the screw 8 formed on the outside of the second male jacket 21.
Male and female flange configurations shown in FIGS. 20 and 21, one-touch coupling configurations of easily removable male and female as shown in FIGS. 20 and 21, and furthermore, male and female one-touch connection configurations shown in FIGS. May be connected to a double pipe joint. In the above embodiment, the high-pressure pipe 6 and the low-pressure pipe 7 are arranged side by side.
As disclosed in Japanese Patent Application Laid-Open No. 1-161619, one pipe may be arranged so as to surround the other pipe.

In the joint according to the present invention, one of the first outer casing 11 and the second outer casing 21 is fixed to a main body side, for example, an indoor unit 71 or an outdoor unit 72 of a separate type air conditioner. It can also be placed in the middle of the two and connected. FIG. 11 shows the latter case. In the example of FIG. 11, the second mantle 21
At the rear end, a three-way valve 73 is connected to the low-pressure
And a two-way valve 74 is provided.
Therefore, when any trouble occurs, the operation of charging or replenishing the refrigerant gas or recovering and sealing the gas to the outdoor unit when disposing of the device can be easily performed.

[0016]

As described above, according to the self-sealing type double pipe joint of the present invention , the first cylindrical section is provided in the first outer cylinder 11.
While fixing the wall 12, a second tube is inserted into the second mantle tube 21.
Securing the Jo partition wall 22, the inner tube passageway 1 of the inner and outer double, the outer tube passage 2 formed respectively, the distal end side in the first spring device 54
The first movable valve 51 biased to the first outer cylinder 11 wall
Between the first cylindrical partition wall 12 and the third spring device 34
The inner pipe movable valve 31 urged toward the distal end is connected to the first cylindrical partition wall.
12 are arranged on the inner wall side with a seal member interposed therebetween.
On the other hand, the second spring device 44 biases the distal end
The second movable valve 41 is connected to the inner wall of the second outer cylinder 21 and the second cylindrical shape.
A seal member is interposed between the partition wall 22 and the
Combining the first mantle 11 and the second mantle 21
Thereby, the first cylindrical partition wall 12 connects the second movable valve 41
On the other hand, the second tubular partition wall 22 is
Of the first movable valve 5
1, the inner pipe passage 1 and the outer pipe passage 2 are independently connected and connected, respectively, while the inner pipe passage 1 is
And a self-sealing double-pipe joint in which the outer pipe passage 2 is shielded from outside air , wherein the first tubular partition wall 12 is
The first movable valve 51 contacts the second movable valve 41 and the second movable valve 51
The second tubular partition wall 22 is in contact with the outer cylinder 21 and the inner pipe is movable.
After contacting the valves 31, respectively, the inner pipe passage 1 and the outer pipe passage
The first movable valve 51 and the second movable valve 51
At least most of the outside air surrounded by the outer cylinder 21
So that the amount is discharged to the outside of the second jacket 21,
Abutment sealing between the first movable valve 51 and the second outer cylinder 21
The outer tube passage 2 and the inner tube passage 1
When communicating with each other, it is possible to prevent outside air from entering the inside of the outer pipe passage 2 and the inner pipe passage 1. as a result,
When connecting the double pipe joint, it is possible to realize a pipe joint that can prevent external leakage of the fluid in the piping system and ensure the purity of the fluid in the piping system. In addition, the present invention relates to the first mantle 11 and
Before the connection of the second outer cylinder 21 is advanced to make the inner pipe passage 1 and the outer pipe passage 2 communicate with each other, the first cylindrical partition wall 12 and the second
The end face of the cylindrical partition wall 22 and the first movable valve 51, the inner pipe is possible
A second valve comprising a valve train 31 and a distal end surface of the second movable valve 41 .
By making the contact surfaces in the first outer cylinder 11 and the second outer cylinder 21 close to each other, the first outer cylinder 11 and the second
The outside air that is going to stay in the second outer casing 21 is forcibly discharged to the outside of the first outer casing 11 and the second outer casing 21, and the outer air flows into the inner pipe passage 1 and the outer pipe passage 2. Mixing can be reliably prevented. In addition, the present invention provides the first mantle 11
A female outer envelope, the second outer envelope 21 as a male outer envelope ,
By making the distal end surface of the second outer cylinder 21 flush with the distal end surface 23 of the second cylindrical partition wall 22 and the distal end surface of the second movable valve 41, the structure is simple, and the sealing location is reduced. Less,
Cost reduction and improvement of airtight reliability can be realized.

Further, according to the present invention, the first mantle 11 is made of a female type.
The outer envelope and the second outer envelope 21 are male outer envelopes ,
While fitting the mantle tube 11 and the second jacket tube 21, the second
The opening of the passage 24 communicating with the inner pipe passage 1 to the side wall while closing the distal end portion 23 of the second cylindrical partition wall 22 in the mantle tube 21 is provided, the first of the mantle on the outside Cylinder 11
First and second movable valve 41 cylindrical as the distal end surface facing the cylindrical partition wall 12 arranged to close the flow path 24 of the second
A gap 42 is formed between the rear outer side of the movable valve 41 and the inner wall of the second outer cylinder 21 so that the outer pipe passage 2 faces, and a first cylindrical section is formed in the first outer cylinder 11. A cylindrical first movable valve 51 is disposed outside the wall 12 so as to face the distal end portion of the second outer cylinder 21, and the first cylindrical partition wall 12 and the inner wall of the first movable valve 51 are connected to each other. A gap 13 is formed between the outer tube passage 2 and the outer tube passage 2 .
The inner tube movable valve 31 having an opening portion of the flow passage 32 communicating with the inner pipe passage 1 in the side wall in the tip inside the cylindrical partition wall 12 of the
The distal end surface 23 of the second jacket tube 21 and the second cylindrical partition wall 22
The inner pipe movable valve 31 has a bulged portion 33 formed behind the flow path 32 so that the inner pipe passage 1 and the outer pipe passage 2 are formed.
With this configuration, it is possible to reliably prevent fluid leakage at the time of coupling, communication and separation of the double pipe joint. Further, according to the present invention, since the contact portion between the first outer cylinder 11 and the second outer cylinder 21 is sealed with a metal seal, it is possible to prevent the contact portion from being deteriorated by the fluid to be sealed. it can. The present invention also provides a first mantle 11 and a second mantle 11
21 is sealed by taper fitting, so that the prevention of fluid leakage in the coupled state of the double pipe joint can be further improved. The invention further a second movable valve 41 first
The movable wall 61 opposing the distal end surface of the cylindrical partition wall 12 and the valve wall 62 urged toward the distal end outside and retreating with the retraction of the movable wall 61 allow the seal portion to communicate with the fluid. Since it is not exposed to the road surface, it has many excellent effects such as the durability of the seal portion can be improved. Further, the present invention provides an indoor unit 71 and an outdoor unit 72.
In the configuration in which the space is connected by two-system piping,
One of the cylinder 11 and the second mantle 21 is
Fixed to indoor unit 71 or outdoor unit 72, or
The first outer casing 11 and the second outer casing 21 are
So that it is located in the middle between the
This allows the refrigerant gas to be
When filling or refilling gas or disposing of
The ability to easily collect and confine to external equipment
Become.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a joint according to the present invention before joining.

FIG. 2 is a longitudinal sectional view of the joint according to the present invention in the middle of joining.

FIG. 3 is a longitudinal sectional view after the joint according to the present invention has been joined.

FIG. 4 is a right side view of the movable valve of the male jacket.

FIG. 5 is a longitudinal sectional view of a joint according to another embodiment before joining.

FIG. 6 is a longitudinal sectional view before joining of a joint according to still another embodiment.

FIG. 7 is a longitudinal sectional view before joining of a joint that does not expose an O-ring to a passage at the time of connection.

8 is a longitudinal sectional view of the joint of FIG. 7 after joining.

FIG. 9 is a longitudinal sectional view before joining of another joint that does not expose the O-ring to the passage at the time of connection.

FIG. 10 is a longitudinal sectional view after the joint of FIG. 9 is joined.

FIG. 11 is an overall schematic diagram of a separate type air conditioner.

FIG. 12 is a partial cross-sectional view of another embodiment of the second movable valve 41 and the second cylindrical partition wall 22 of FIG. 1;

FIG. 13 is an external view of still another embodiment of the second movable valve 41 of FIG.

14 is a partial cross-sectional view of yet another embodiment of the first movable valve 51 in FIG. 1 a first cylindrical partition wall 12.

FIG. 15 is a partial sectional view of still another embodiment of the second movable valve 41 and the second cylindrical partition wall 22 of FIG. 1;

FIG. 16 is a longitudinal sectional view of a joint according to yet another embodiment before joining.

17 is a longitudinal sectional view after the joint of FIG. 16 is joined.

FIG. 18 is a longitudinal sectional view of a joint according to yet another embodiment before joining.

19 is a longitudinal sectional view after the joint of FIG. 18 is joined.

FIG. 20 is a longitudinal sectional view of a joint according to yet another embodiment before joining.

21 is a longitudinal sectional view after the joint of FIG. 20 is joined.

FIG. 22 is a longitudinal sectional view of a joint according to yet another embodiment before joining.

FIG. 23 is a longitudinal sectional view after the joint of FIG. 22 is joined.

[EXPLANATION OF SYMBOLS] 1 inner tube passage 2 the outer tube passages 4, 5 connecting the branch pipe 6 high-pressure tube 7 low pressure pipe 8 screw 9 Nut 11 first jacket tube 12 first cylindrical partition wall 13, 42 a gap 21 first 2 outer jacket 22 second partition wall 23 male partition wall tip (surface) 24, 32 flow path 31 inner pipe movable valve 41 second movable valve 51 first movable valve 61 movable wall 62 valve wall 63 Locking part 71 Indoor unit 72 Outdoor unit 73 Three-way valve 74 Two-way valve

Claims (7)

[Claims] 1. A tubular partition wall (12) (22) is fixed in a pair of outer cylinders (11) and (21) to form an inner / outer dual inner pipe passage (1) and outer pipe passage (2). The movable valves (31), (41), (51) formed and urged to the distal end side by a spring device are provided with a sealing member interposed between the mantle tube wall and the cylindrical partition walls (12, 22). The pair of outer cylinders (11)
By combining (21), the cylindrical partitioning walls (12) and (22) become movable valves (31), (41) and (5).
1) is pressed to couple and communicate the inner pipe passage (1) and the outer pipe passage (2) independently, while the inner pipe passage (1) and the outer pipe passage (2) are separated from each other. In the self-sealing double pipe joint which is shut off from the outside air, the cylindrical partition walls (12) and (22) come into contact with the movable valves (31), (41) and (51) so that the inner pipe passage ( Before each of the contact sealing portions of 1) and the outer pipe passage (2) is shut off from the outside air, the outside air inside the contact sealing portion does not stay and stays outside the cylindrical partition walls (12) and (22). A self-sealing double pipe joint characterized by being configured to be discharged. 2. A cylindrical partition wall (12) (22) before the connection of the pair of outer cylinders (11) and (21) is advanced to communicate the inner pipe passage (1) and the outer pipe passage (2). ) And the end faces of the movable valves (31), (41), (51) and the end faces of the pair of outer cylinders (11), (21) are brought into close contact with each other. The self-sealing double pipe joint according to claim 1. 3. A pair of outer cylinders (11) and (21) are a female outer cylinder (11) and a male outer cylinder (21), and a distal end surface of the male outer cylinder (21) is a partition wall (3). 3. The self-sealing double pipe joint according to claim 2, wherein the front end face of the movable valve is flush with the front end face of the movable valve. 4. A pair of outer cylinders (11) and (21) are a female outer cylinder (11) and a male outer cylinder (21), and the male and female outer cylinders (11) and (21) are fitted. While the male jacket (2
In 1), the distal end portion (23) of the cylindrical partition wall (22) is closed, and an opening portion of a flow path (24) communicating with the inner pipe passage (1) is provided on the side wall thereof. A cylindrical movable valve (41) is arranged so as to face the distal end surface of the cylindrical partition wall (12) of the sleeve (11) to close the flow path (24), and the rear part of the movable valve (41) A gap (42) is formed between the outer side and the inner wall of the outer casing (21) so that the outer pipe passage (2) faces, and the cylindrical partition wall (1) is provided in the female outer casing (11).
A cylindrical movable valve (51) is disposed outside the male outer cylinder (21) so as to face the distal end of the male outer cylinder (21), and the cylindrical partition wall (1) is provided.
A gap (13) between 2) and the inner wall of the movable valve (51)
The inner pipe passage (1) faces the outer pipe passage (2), and the inner pipe passage (1) is formed on the side wall inside the distal end portion of the cylindrical partition wall (12).
Valve (3) provided with an opening of a flow path (32) communicating with the
1) is connected to the cylindrical partition wall (2) in the male jacket (21).
2) is disposed so as to face the distal end surface (23), and the movable valve (31) is provided with a bulging portion (3) behind the flow path (32).
The self-sealing double pipe joint according to any one of claims 1 to 3, wherein the inner pipe passage (1) and the outer pipe passage (2) are formed by forming (3). . 5. The self-sealing double pipe joint according to claim 4, wherein a contact portion between the male outer cylinder (21) and the female outer cylinder (11) is sealed by a metal seal. 6. The self-sealing double pipe according to claim 4, wherein the male outer cylinder (21) and the female outer cylinder (11) are taperedly fitted and sealed. Fittings. 7. A movable valve (41) is urged toward the distal end outside the movable wall (61) facing the distal end surface of the cylindrical partition wall (12), and retreats with the retreat of the movable wall (61). 4. A valve wall comprising:
The self-sealing double pipe joint according to claim 6.