JP2974135B2 - Self-sealing double pipe fitting - Google Patents

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 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]

According to the present invention, a first cylindrical partition wall 12 abuts on a second movable valve 41 and a first movable valve 5 is provided.
1 comes into contact with the second outer cylinder 21 and the second cylindrical partition wall 22
There are provided so as to abut the inner tube movable valve 31,
Before the inner pipe passage 1 and the outer pipe passage 2 communicate with each other ,
First tubular partition wall 12, second movable valve 41, inner pipe movable
The valve 31, the second cylindrical partition wall 22, the first movable valve 51,
The contact surfaces with the second outer cylinder 21 are brought into close contact with each other.
In the process, the first tubular partition wall 12 and the inner pipe movable valve 31
Each end face, the second movable valve 41 and the second cylindrical partition wall
22 and the front of the second mantle 21
Wherein the majority of the ambient air surrounded by the inner circumferential surface or the front end surface a second
Is discharged to the outside of the outer cylinder 21 of the above . 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. The present invention also provides a first mantle 1
1 is a female outer sleeve, the second outer sleeve 21 is a male outer sleeve, and the first outer sleeve 11 and the second outer sleeve 21 are fitted together, while the second outer sleeve 21 is fitted. Second cylindrical partition wall 2 in sleeve 21
2 is closed and the inner pipe passage 1 is
And a cylindrical second movable valve 41 is arranged outside the opening so as to face the distal end surface of the first cylindrical partition wall 12 of the first outer cylinder 11. To close the flow path 24, and the rear outside of the second movable valve 41 and the second mantle 21
Forming a gap 42 between the inner wall and the outer tube passage 2
A first movable valve 51 having a cylindrical shape is disposed inside the first outer cylinder 11 outside the first cylindrical partition wall 12 so as to face the distal end of the second outer cylinder 21. A gap 13 is formed between the cylindrical partition wall 12 and the inner wall of the first movable valve 51 so that the outer pipe passage 2 faces. The inner pipe movable valve 31 provided with the opening of the flow path 32 communicating with the pipe passage 1 is disposed so as to face the distal end surface 23 of the second cylindrical partition wall 22 in the second outer cylinder 21. A bulging portion 33 is formed in the movable pipe 31 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 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 double pipe joint of the present invention, the first cylindrical partition wall 12 is fixed in the first outer cylinder 11, while the second outer jacket is fixed. A second cylindrical partition wall 22 is fixed in the cylinder 21 to form inner and outer dual inner pipe passages 1 and outer pipe passages 2, respectively, and the first spring device 54 urges the inner pipe passage 1 toward the distal end side. The inner pipe movable valve 31 urged toward the distal end by the third spring device 34 between the first movable valve 51 and the first outer casing 11 wall and the first cylindrical partition wall 12 is moved to the first movable valve 51. The second movable valve 41 urged toward the distal end by the second spring device 44 is disposed on the inner wall side of the cylindrical partition wall 12 with the seal member interposed therebetween. The first outer casing 11 and the second outer casing 21 are combined by disposing a sealing member between the inner wall of the While Jo partition wall 12 presses the second movable valve 41, the second cylindrical partition wall 22 is an inner tube movable valve 31
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 the outside air, wherein the first cylindrical partition wall 12 abuts on the second movable valve 41 and the first movable valve 51 in contact with the second jacket tube 21, respectively provided as the second cylindrical partition wall 22 abuts against the inner tube movable valve 31, the inner tube passageway 1
And before the outer pipe passage 2 communicates with each other ,
The partition wall 12, the second movable valve 41, the inner pipe movable valve 31,
The second cylindrical partition wall 22, the first movable valve 51, and the second mantle
In the process of bringing the contact surfaces with the cylinder 21 into close contact with each other,
Each tip of one cylindrical partition wall 12 and inner pipe movable valve 31
Surface, that of the second movable valve 41 and the second cylindrical partition wall 22
Each tip surface, and the front inner peripheral surface of the second outer cylinder 21 or
Means that most of the outside air surrounded by the front end surface is
1, the outside air is prevented from entering the inside of the outer pipe passage 2 and the inner pipe passage 1 when the outer pipe passage 2 and the inner pipe passage 1 communicate with each other. it can. 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 tubular partition wall 12 and the first tubular partition wall 12 before the connection between the first outer jacket 11 and the second outer jacket 21 is advanced to allow the inner pipe passage 1 and the outer pipe passage 2 to communicate with each other. The inside of the first outer cylinder 11 and the second end, which are formed by the distal end surface of the second cylindrical partition wall 22 and the distal end surfaces of the first movable valve 51, the inner pipe movable valve 31, and the second movable valve 41. Outer cylinder 21
The inner contact surfaces are brought into close contact with each other, so that the outside air that tends to stay in the first outer casing 11 and the second outer casing 21 is removed from the first outer casing 11 and the second outer casing 21. The air is forcibly discharged to the outside of the sleeve 21 and external air can be reliably prevented from entering the inner pipe passage 1 and the outer pipe passage 2. Further, in the present invention, the first outer cylinder 11 is a female outer cylinder, the second outer cylinder 21 is a male outer cylinder, and the distal end surface of the second outer cylinder 21 is the second outer cylinder. By making the distal end surface 23 of the cylindrical partition wall 22 and the distal end surface of the second movable valve 41 flush with each other, the structure is simple, the number of sealing points is reduced, cost reduction and improvement of airtight reliability are achieved. realizable.

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]

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 first outer cylinder 12 first cylindrical partition wall 13, 42 gap 21 second outer cylinder 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 section 71 Room Unit 72 Outdoor unit 73 Three-way valve 74 Two-way valve

Claims (7)

(57) [Claims] A first cylindrical partition wall (12) is fixed in a first outer cylinder (11), while a second cylindrical partition wall (12) is fixed in a second outer cylinder (21). 22) is fixed to form an inner and outer dual inner pipe passage (1) and an outer pipe passage (2), respectively, and a first movable valve urged toward the distal end by a first spring device (54). (51) is biased toward the distal end by a third spring device (34) between the wall of the first outer casing (11) and the first cylindrical partition wall (12). The movable valve (31) is disposed on the inner wall side of the first cylindrical partition wall (12) with a seal member interposed therebetween, and the movable valve (31) is biased toward the distal end by a second spring device (44). The second movable valve (41) is disposed between the inner wall of the second outer cylinder (21) and the second cylindrical partition wall (22) with a seal member interposed therebetween, and the first outer valve is provided. The hood (11) and the second By combining mantle tube (21), said first tubular partition wall (12) of the second
While the second cylindrical partition wall (22) presses the inner pipe movable valve (31), and the second outer jacket (21) presses the first outer valve (41). Movable valve (5
1) is pressed to couple and connect 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. )
A self-sealing double pipe joint, which is adapted to shut off the first cylindrical partition wall (12) from the outside air.
A movable valve (41) of the first movable valve (51).
There abutting said second jacket tube (21) abuts the second cylindrical partition wall (22) of the inner tube movable valve (31)
Uni respectively provided, before the inner tube passageway (1) and the outer tube passage (2) communicates with each first cylindrical Ward
Picture wall (12), second movable valve (41), inner pipe movable valve
(31), the second cylindrical partition wall (22), and the first movable valve
(51) and the contact surface between the second mantle (21)
In the process of bringing the first cylindrical partition wall (12) into close contact,
A distal end face of each of the pipe movable valves (31) and a second movable valve;
(41) and each tip of the second cylindrical partition wall (22)
Surface and the front inner peripheral surface or tip of the second mantle (21)
Wherein the majority of the ambient air surrounded by the surface second jacket tube (21)
A self-sealing double pipe joint characterized by discharging to the outside of a pipe. 2. A method according to claim 1, wherein the first outer casing is a female outer casing and the second outer casing is a male outer casing. 2. The self-sealing type according to claim 1 , wherein the front end surface of the second movable partition is flush with the front end surface of the second cylindrical partition wall and the front end surface of the second movable valve. Double pipe fitting. 3. The first outer casing (11), wherein the first outer casing (11) is a female outer casing and the second outer casing (21) is a male outer casing. And the second outer cylinder (21) are fitted together, while closing the tip (23) of the second cylindrical partition wall (22) in the second outer cylinder (21) and An opening of a flow path (24) communicating with the inner pipe passage (1) is provided on the side wall, and a front end face of a first cylindrical partition wall (12) of the first outer casing (11) is provided outside the opening. A cylindrical second movable valve (41) is arranged so as to oppose to block the flow path (24),
A gap (42) is formed between the rear outer side of the second movable valve (41) and the inner wall of the second outer cylinder (21) to face the outer pipe passage (2), and the first In the outer cylinder (11), a cylindrical first movable valve (5) is provided outside the first cylindrical partition wall (12) so as to face the tip of the second outer cylinder (21).
1), a gap (13) is formed between the first cylindrical partition wall (12) and the inner wall of the first movable valve (51), and the outer pipe passage (2) is exposed. In addition, the inner pipe passage (1) is provided on the side wall inside the distal end portion of the first cylindrical partition wall (12).
The inner pipe movable valve (31) provided with an opening of a flow path (32) communicating with the inner end of the second cylindrical partition wall (22) in the second outer cylinder (21). 23), the inner pipe movable valve (31) is provided with a bulging portion (33) behind the flow path (32) to form the inner pipe passage (1) and the outer pipe passage. A contract characterized by comprising (2).
The self-sealing double pipe joint according to claim 1 or 2 . 4. A first envelope (11) and a second envelope (2).
The self-sealing double pipe joint according to claim 3 , wherein a contact portion with (1) is sealed by a metal seal. 5. A first envelope (11) and a second envelope (2).
1) and are sealed by taper fitting
The self-sealing double pipe joint according to claim 3 or 4 . 6. A movable wall (61) for urging a second movable valve (41) to a distal end side outside a movable wall (61) opposed to a distal end surface of a first cylindrical partition wall (12). And a valve wall (62) which retreats with the retraction of the valve.
The self-sealing double pipe joint according to claim 3 . 7. The distance between the indoor unit (71) and the outdoor unit (72) is two.
In the configuration in which communication is performed by system piping, the first outer cylinder (1
Either 1) or the second outer cylinder (21) is fixed to the indoor unit (71) or the outdoor unit (72),
Alternatively, a first envelope (11) and a second envelope (21)
2. The self-sealing double pipe joint according to claim 1, wherein the first and second pipes are connected between the indoor unit (71) and the outdoor unit (72).