JPH0718519B2 - Cryogenic fluid piping connection and separation device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting / separating device for piping for cryogenic fluid. For example, it can be used as a joint for piping through which a cryogenic fluid such as liquid nitrogen flows.

[0002]

BACKGROUND ART For example, as a joint for a pipe through which a cryogenic fluid such as liquid nitrogen flows, a structure is used in which a flange is integrally provided at each connection end of the pipe and the flange is fastened with a bolt / nut or the like. There is. This is because it is not necessary to remove the joint portion in a pipe through which a cryogenic fluid such as liquid nitrogen flows.

By the way, in a levitation railway using a linear motor, liquid nitrogen or the like must be supplied from the ground onto a traveling vehicle in order to cool a coil of an electromagnet. The fastened joint will hinder the running of the vehicle.

Therefore, conventionally, as a structure for supplying liquid nitrogen or the like from the ground to a traveling vehicle, a quick valve is attached to the connecting end of the pipe, and the connecting end of the pipe can be connected and separated by this quick valve. In addition, the connection end portion can be closed in the separated state.

[0005]

However, as in the prior art, if the connecting end of the pipe is configured to be connectable and separable by the quick valve, the quick valve is directly exposed to the outside air when it is removed. The cryogenic fluid such as liquid nitrogen flowing through the frost causes frost on the quick valve, resulting in a situation in which reconnection is impossible.

It is an object of the present invention to provide a connection / separation device for a cryogenic fluid pipe, which can solve the above-mentioned drawbacks of the prior art and reliably connect / separate the pipe.

[0007]

Therefore, the connection / separation device for a cryogenic fluid pipe according to the present invention comprises a first pipe and a second pipe, which are composed of an outer pipe and an inner pipe housed in the outer pipe and through which the cryogenic fluid flows. Is a connection / separation device for cryogenic fluid pipes that can be connected to and separated from each other, and a valve that is connected to and separable from each other at the inner pipe connection end of each of the pipes and that is in a closed state in the separated state is provided. Along with the outer pipe connecting end of each of the pipes, a sheath pipe for cutting off the valve from the outside air is provided on the outer periphery,
A shutter mechanism that can be opened and closed is provided on the surface of each sheath tube facing the valve.

[0008]

In connecting the pipes, the sheath pipes are brought into contact with each other, and in this state, the shutter mechanism provided in each sheath pipe is opened, and then the valves of the inner pipes are connected to each other. In this state, even if a cryogenic fluid is caused to flow through the mutually connected inner tubes, each inner tube and each valve are shielded from the outside air by the outer tube and the sheath tube, so that frost and the like can be prevented from being generated. In separating the pipes, the valves of the inner pipe are separated from each other, and then the shutter mechanism is closed. Then, the inner pipe and each valve of each pipe are in a state of being shielded from the outside air by the outer pipe, the sheath pipe, and the shutter mechanism, so that the generation of frost and the like can be prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The cryogenic fluid pipe connection / separation device of the present invention will be described in detail below with reference to the embodiments shown in the drawings.

First Embodiment A first embodiment is shown in FIGS. FIG. 1 is a sectional view showing the connection / separation device of this embodiment. In the figure, A is a pipe provided on the vehicle side, and B is a pipe provided on the ground side. The connection ends of these pipes A and B are connected to each other,
Valves 11A and 11B that are separable and that are in a closed state in a separated state are provided respectively, and a sheath pipe 21 that shuts off these valves 11A and 11B from the outside air.
A and 21B are provided. Shutter mechanisms 31A and 31B that can be opened and closed are provided on the surfaces of the sheath tubes 21A and 21B facing the valves 11A and 11B, respectively.

As shown in the enlarged view of the main part of FIG. 2, the pipe A is formed in an inner-outer double pipe structure of an outer pipe 1A and an inner pipe 2A housed in the outer pipe 1A and supplying a cryogenic fluid therein. Has been done. The inner tube 2A is formed shorter than the tip of the outer tube 1A, and has the valve 11A at its tip. Valve 1
Reference numeral 1A denotes a holding cylinder 13A fixed to the tip of the inner pipe 2A and having an annular projecting edge 12A at an inner intermediate position, and a valve seat body fitted to the outer circumference of the tip of the holding cylinder 13A and having a hole 14A at the center. 15A and a flange portion 16 which is slidably accommodated in the holding cylinder 13A and opens and closes a hole 14A of the valve seat body 15A.
A valve body 17A having A and a flange portion 16A of the valve body 17A
18A housed between the ring and the annular protrusion 12A
It consists of and. The base end of the bayonet outer tube 3A is fitted and fixed to the outer periphery of the holding cylinder 13A. A female socket 4A is attached between the tip of the bayonet outer tube 3A and the tip of the outer tube 1A.

As shown in the enlarged view of the main part of FIG. 3, the pipe B is formed in an inner-outer double pipe structure of an outer pipe 1B and an inner pipe 2B housed in the outer pipe 1B and flowing an internal cryogenic fluid. ing. The inner tube 2B projects longer than the tip of the outer tube 1B, and has the valve 11B at its tip. Valve 1
Reference numeral 1B denotes a holding cylinder 13B fixed to the tip of the inner tube 2B and having an annular projecting edge 12B at an inner intermediate position, and a valve seat body fitted to the outer circumference of the tip of the holding cylinder 13B and having a hole 14B in the center. 15B and a flange portion 16 slidably housed in the holding cylinder 13B and opening and closing a hole 14B of the valve seat body 15B.
A valve body 17B having B and a flange portion 16B of the valve body 17B
18B housed between the ring and the annular protrusion 12B
It consists of and. The tip portion of the bayonet inner tube 3B is fitted and fixed to the outer periphery of the holding cylinder 13B. A male socket 4B engageable with and disengageable from the female socket 4A is attached between the base end of the bayonet inner pipe 3B and the tip of the outer pipe 1B.

The sheath tubes 21A and 21B are provided with substrates 23A and 23B which are supported on the outer circumferences of the distal ends of the outer tubes 1A and 1B through O-rings 22A and 22B, and the substrates 23.
Outer cylinders 24A and 24B fitted around the outer circumferences of A and 23B,
It is fixed to the tips of the outer cylinders 24A, 24B and has an opening 2 at the center.
It is composed of cover plates 26A and 26B having 5A and 25B. The outer cylinder 24A is long enough to cover the female socket 4A from the tip of the outer tube 1A,
4B is formed to have a length capable of covering substantially the entire length of the bayonet inner tube 3B from the tip portion of the outer tube 1B.
The substrate 23B of the sheath tube 21B is attached to the outer tube 1B so as to be slidable in the axial direction while maintaining an airtight state.

Since the shutter mechanisms 31A and 31B have the same structure, one shutter mechanism 31B is used here.
Only the shutter mechanism 31A will be described, and the description of the other shutter mechanism 31A will be omitted. As shown in FIGS. 4 to 6, the shutter mechanism 31B has four rotary shafts 32 _1, 32 ₂ rotatably fitted around the opening 25B of the cover plate 26B at 90-degree intervals. _, 32 _3, 32 ₄ and each of the rotating shafts 32 ₁ ~
A total of four blades 33 _1, 33 _2, 33 _3, 33 ₄ fixed to the inner end of 32 ₄ for opening and closing the opening 25B, and each blade 3
3 _to 333 ₄ mutually closing direction (counterclockwise direction in FIG. 4)
And biasing means 34 _1, 34 _{2, 34} 3, 34 ₄ to pivotally urged into,
Wherein the rotary shafts 321 _to 323 gear 35 ₁ which is fixed to the outer end of the _4, 35 _{2, 35} 3, 35 _4, all of these gears 35 ₁
It is configured to mesh with the lid plate 26B to 35 ₄ rotatably retained internal gear 36..

[0015] Each of the biasing means 34 ₁ to 34 _4, proximal end the rotary shafts 321 _to 323 ₄ to be rotatably supported and the outer end of each vane 33 _to 333 ₄ to the distal portion An urging lever 37 having an engaging protrusion that abuts against the edge, and the rotating shafts 3
2 _{1-32 4} wound around one end of the cover plate 26B in locked and the other end closed to each other each vane 33 _to 333 ₄ via the locked biased lever 37 that in the urging lever 37 And a wire spring 38 that urges in the direction. Each vane 33 _to 333 ₄ as shown in FIG. 7, when all the blades 33 _to 333 ₄ is closed, all of the blades 33 ₁ -
The outer surface of 33 ₄ is formed so as to form a flat coplanar surface, and adjacent blades 33 _{1 to} 33 ₄ are partially overlapped with each other. Specifically, the outer surfaces of all the blades 33 _{1 to} 33 ₄ are arranged so as to be rotatable in the same plane, and the second blade 33 ₂ has a first surface.
The notch 41 that overlaps a part of the tip edge of the blade 33 ₁ of the
The blade 33 ₃ of the second blade 33 ₂ and the first edge of the _second blade 33 ₂ .
Notches 42, 43 in which a part of the inner edge of the blade 33 ₁ of
However, the fourth blade 33 ₄ is provided with notches 44, 45 and 46, respectively, in which the leading edge of the _third blade 33 ₃ and part of the inner edge of the second and first blades 33 ₂ and 33 ₁ overlap. Has been formed.

Next, the operation of this embodiment will be described with reference to FIGS. 8 and 9. When connecting the pipes A and B, as shown in FIG. 8, when the pipe B is brought close to the pipe A and the shutter mechanisms 31A and 31B are in contact with each other, the sheath pipes 21A and 21B of the pipes A and B are connected. The parts are connected and fixed by a connecting means (not shown). After that, the shutter mechanisms 31A and 31B are opened. First of all,
Both internal gears 26A and 26B are rotated. Then, it gear 35 which meshes with _{1-35 4} and the rotation shaft 32 _1-3
2 ₄ each blade 33 via a _to 333 ₄ biasing means 34 ₁ -
34 against the urging force of ₄ is rotated in the direction (counterclockwise direction in FIG. 6) to open each other. Thereby, the lid plates 26A, 26B
25A and 25B are opened.

In this state, the pipe B is pushed into the pipe A. Then, first, the valve 11 of the pipe B
B is inserted into the bayonet outer pipe 3A of the pipe A through the openings 25A and 25B. Eventually, when it is pushed to the final pushing position, as shown in FIG.
The male socket 4B is fitted into A, and the valves 11A and 11B are brought into contact with each other and opened. That is,
When the pipe B is further pushed in the state where the valve bodies 17A and 17B of both valves 11A and 11B are in contact with each other,
Either one, for example, the valve body 17A is retracted against the spring 18A, and the collar portion 16A is separated from the hole 14A of the valve seat body 15A and the hole 14A is opened. Eventually, when the valve body 17A reaches the retreat limit, the valve body 17B is retracted against the spring 18B, and the collar portion 16B is separated from the hole 14B of the valve seat body 15B and the hole 14B is opened.

As a result, the valves 11A. When both 11B are opened, the inner tubes 2A, 2B are in communication with each other, and in this state, the cryogenic fluid can be supplied from the ground to the vehicle through the inner tubes 2A, 2B. Even in this case, the valves 11A. 11B is blocked by the bayonet outer tube 3A and the bayonet inner tube 3B, and further, the connecting end portions of the outer tubes 1A and 1B that cover the outside thereof are also covered with the sheath tube 2
Since it is blocked by 1A and 21B, the inner tube 2A,
The cryogenic fluid flowing in 2B can be kept completely shielded from the outside air.

On the other hand, in separating the pipes A and B, the pipe B is retracted in a direction away from the pipe A.
Then, the male socket 4B is disengaged from the female socket 4A, and as the male socket 4B retracts, the valves 11A, 11B
Valve bodies 17A, 17B are advanced by the urging force of the springs 18A, 18B, and the collar portions 16A, 16B are moved to the valve seat bodies 15A, 1
Since the holes 14A, 14B of 5B are closed, the valves 11A, 1
1B is closed together.

In this state, the pipe B is further retracted to its original position, and then the shutter mechanisms 31A and 31B are closed. For this purpose, first, both internal gears 26A and 26B are rotated. Then, the blades 33 _{1 to} 33 ₄ are engaged via the gears 35 _{1 to} 35 ₄ and the rotating shafts 32 _{1 to} 32 ₄ which mesh with the blades 33 _{1 to} 33 4.
_The urging force of the urging means 34 _{1 to} 34 ₄ causes the ₄ 's to rotate in a direction of closing each other (clockwise in FIG. 6). As a result, the openings 25A and 25B of the lid plates 26A and 26B are closed.
After this, the connection means for connecting and fixing the two sheath tubes 21A and 21B to each other is released, and then the pipe B is separated from the pipe A.

Therefore, according to the first embodiment, the outer tube 1A,
In pipes A and B having 1B and inner pipes 2A and 2B, valves 11A and 11B connectable and separable from each other are provided at the connection ends of the inner pipes 2A and 2B, and the outer pipes 1
At the connecting ends of A and 1B, there are provided sheath tubes 21A and 21B for shutting off the valves 11A and 11B from the outside air.
Since the shutter mechanism 31A, 31B that can be opened and closed is provided in 1B, it is possible to connect and disconnect the pipes A, B while the valves 11A, 11B are shut off from the outside air.

That is, when connecting the pipes A and B,
The sheath tubes 21A and 21B are brought into contact with each other, and in this state, the shutter mechanism 31 provided on each of the sheath tubes 21A and 21B.
After opening A and 31B, valve 1 of each inner pipe 2A and 2B
1A and 11B are connected to each other. In this state,
Even if a cryogenic fluid is caused to flow through the inner pipes 2A, 2B connected to each other, the inner pipes 2A, 2B and the valves 11A, 11B are blocked from the outside air by the outer pipes 1A, 1B and the sheath pipes 21A, 21B. It is possible to prevent the generation of frost and the like.

In separating the pipes A and B, the shutter mechanisms 31A and 31B are closed after the valves 11A and 11B of the inner pipes 2A and 2B are separated from each other. Then,
Inner pipes 2A, 2B of each pipe A, B and each valve 11A,
The outer tube 11B is shielded from the outside air by the outer tubes 1A and 1B, the sheath tubes 21A and 21B, and the shutter mechanisms 31A and 31B, so that the formation of frost or the like can be prevented. Therefore, an effect that the pipe connection and separation work can be reliably performed can be expected. .

In addition, each shutter mechanism 31A, 31B
33 blades₁~ 33_FourAnd these 4
33 blades₁~ 33_FourAll wings when closed
33 ₁~ 33_FourThe outer surface of the
That is, the blade 33₁~ 33_Fourof
Since there is no step on the outer surface, there is no dust on it.
Is hard to attach. Moreover, the adjacent blades 33₁~ 3
Three_FourEach blade 33 so that a part of₁~ 33_Four
Since the notch is formed in a part of the sheath, the sheath tubes 21A, 21B
The airtightness inside can be improved.

Second Embodiment A second embodiment is shown in FIGS. In the description of these drawings, the same constituents as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted or simplified. In this embodiment, the outer pipes 1A of the pipes A and B,
It differs from the first embodiment in that a connecting device for connecting the 1Bs to each other is provided at the tips of the outer pipes 1A and 1B of the pipes A and B, respectively. As shown in FIGS. 10 and 11, the connecting device C includes an insertion member 5 provided at the tip of the outer tube 1A.
1 and the insertion member 5 provided at the tip of the outer tube 1B.
And a holding mechanism 61 that holds the No. 1 in an engageable and disengageable manner.

First, as shown in FIG. 10, the insertion member 51 includes the tip of the outer tube 1A and the bayonet outer tube 3A.
It has a thin-walled cylindrical insertion portion 52 on the tip side and a collar portion 53 on the middle portion. A concave groove 54 having a substantially semicircular cross section is formed on the outer periphery of the insertion portion 52.
Is formed in a ring shape.

Further, as shown in FIG. 11, the holding mechanism 61 includes the tip of the outer tube 1B and the bayonet inner tube 3B.
It has a cylindrical connecting cylinder 62 provided between the base end and the base end. The connecting cylinder 62 is a thick-walled cylindrical portion 62 provided between the tip of the outer tube 1B and the base end of the bayonet inner tube 3B.
A, and a thin-walled cylindrical portion 62B extending along the outer periphery of the bayonet inner tube 3B at its tip. Thick-walled cylindrical portion 62A
A holding cylinder 64 that forms a storage groove 63 between the outer peripheral surface of the thin-walled cylindrical portion 62B and the outer peripheral surface thereof is screwed. The holding cylinder 64 is provided with a step portion 65 on the inner peripheral surface thereof and a stopper ring 66 on the outer peripheral surface thereof, respectively, and a plurality of holes for accommodating a plurality of balls 67 movably in the radial direction therebetween. 68 is formed.

A cylindrical movable piece 70 is housed in the housing groove 63 so as to be movable in the axial direction, and a spring 7 for urging the movable piece 70 in a direction to push the movable piece 70 out of the housing groove 63.
1 is stored. On the outer peripheral surface of the base end of the movable piece 70,
A projecting edge portion 69 is formed which is in contact with the step portion 65 and whose position in the pushing direction by the spring 71 is restricted. A sleeve 72 is provided on the outer circumferences of the outer tube 1B, the connecting cylinder 62, and the holding cylinder 64 so as to be slidable in the axial direction, and is biased leftward in FIG. 11 by a spring or the like (not shown). . The hole 6 is provided at the tip of the sleeve 72.
Holding groove 73 that engages with a ball 67 protruding outward from
Are formed.

Next, the operation of the connecting device C will be described with reference to FIGS. 12 and 13. When the pipe B is moved closer to the pipe A, as shown in FIG. 12, first, the insertion portion 52 of the insertion member 51 contacts the movable piece 70 of the holding mechanism 61, and the movable piece 70 is attached with the spring 71. It is pushed into the storage groove 63 against the power. Then, as shown in FIG. 13, when the movable piece 70 is pushed to the end and the recessed groove 54 formed in the insertion portion 52 of the insertion member 51 is inserted to a position corresponding to the ball 67, the ball 67 is recessed. Fit inside. Then, the sleeve 72 slides to the left in FIG. 13, so that the ball 67 is held in the recessed groove 54. As a result, the insertion member 51 is connected while being held by the holding mechanism 61.

On the other hand, in order to release the connected state, the sleeve 72 is slid to the right in FIG. 13, and then the pipe B is pulled away from the pipe A so that the sleeve 72 fits into the groove 54. Since the existing ball 67 is pushed outward in the radial direction, the pipe B can be pulled out as it is. At this time, the movable piece 70 is returned to its original position by the urging force of the spring 71.

Therefore, according to the second embodiment, the insertion member 51 provided in the outer pipe 1A of the pipe A can be inserted into the outer pipe of the pipe B by simply inserting the pipe B in the direction of approaching the pipe A. Since it is automatically held and connected to the holding mechanism 61 provided in 1B, there is an advantage that the connecting operation can be performed easily and quickly.

Further, the valves 11A and 11B of this embodiment are the same in principle as the valves of the first embodiment, so the corresponding parts are designated by the same reference numerals and the description thereof is omitted.

In each of the above-mentioned embodiments, the connection / separation device of the pipe for supplying liquid nitrogen or the like from the ground to the traveling vehicle has been described, but the connection / separation device of the present invention is not limited to the above-mentioned examples. It can be applied to general devices for connecting and separating pipes for flowing a cryogenic fluid.

Further, the structures of the valves 11A and 11B are not limited to the structures described in each of the above embodiments, and other structures may be used. In short, any structure may be used as long as the valves can be connected to each other and can be separated from each other and are in a closed state in the separated state.

[0035]

As described above, according to the connection / separation device for a cryogenic fluid pipe of the present invention, in a pipe consisting of an outer pipe and an inner pipe, a valve which can be connected to and separated from the connection end of each inner pipe. In addition to the above, a sheath pipe is provided at the connection end of each outer pipe to shut off the valve from the outside air, and a shutter mechanism that can be opened and closed is provided on this sheath pipe, so the pipes can be connected and disconnected while the valve is shut off from the outside air. You can do the work. Therefore, since the cryogenic fluid flowing through the inner pipe is also shielded from the outside air by the outer pipe and the sheath pipe, it is possible to expect an effect that the pipes can be connected and disconnected reliably without frost formation.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of an essential part showing a pipe A provided on the vehicle side in the embodiment.

FIG. 3 is an enlarged view of an essential part showing a pipe B provided on the ground side in the above embodiment.

4 is a sectional view taken along line IV-IV in FIG.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a view as seen from an arrow VI in FIG.

FIG. 7 is a perspective view of the blade shown in FIG.

FIG. 8 is a diagram showing a state before connecting the pipe A and the pipe B of the above embodiment.

FIG. 9 is a view showing a state after the pipe A and the pipe B of the above-mentioned embodiment are connected.

FIG. 10 is a diagram showing a pipe A provided on the vehicle side in the second embodiment of the present invention.

FIG. 11 is a view showing a pipe B provided on the ground side in the above embodiment.

FIG. 12 is a view showing a state before connecting the pipe A and the pipe B of the above embodiment.

FIG. 13 is a view showing a state after connecting the pipe A and the pipe B of the above-mentioned embodiment.

[Explanation of symbols]

 A, B piping 1A, 1B outer tube 2A, 2B inner tube 11A, 11B valve 21A, 21B sheath tube 31A, 31B shutter mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noboru Sagawa 1-4-1, Mei Station, Nakamura-ku, Nagoya-shi, Aichi Tokai Passenger Railway Co., Ltd. Chome 1-4 Tokai Passenger Railway Co., Ltd. (72) Inventor Katsumi Suzuki 1-4-1 Mei Station, Nakamura-ku, Nagoya-shi, Aichi Tokai Passenger Railway Co., Ltd. (72) Inventor Shoji Matsuda Shibaura, Minato-ku, Tokyo 1-1-1 Toshiba Co., Ltd. (72) Inventor Mamoru Hamanishi 3-1-1 Kojimachi, Chiyoda-ku, Tokyo Suzuki Stock Exchange

Claims (1)

[Claims] 1. A connection / separation device for a cryogenic fluid pipe, which is capable of connecting and disconnecting an outer pipe and first and second pipes, which are an inner pipe housed in the outer pipe and flowing a cryogenic fluid, from each other. A valve that is connectable to and separable from each other at the inner pipe connecting end of each pipe, and that is closed in the separated state, and that shuts off the valve from the outside air at the outer periphery of the outer pipe connecting end of each pipe. A sheath pipe is provided, and a shutter mechanism that can be opened and closed is provided on the surface of each sheath pipe facing the valve.
A connection / separation device for piping for cryogenic fluid, which is characterized in that