JPH045839Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a vacuum jacket valve for opening and closing vacuum insulated piping.

[Conventional technology]

FIG. 2 shows a conventional vacuum jacket valve. This vacuum jacket valve 1 is generally composed of a valve body 2 and a jacket 3. The valve body 2 is a type of globe-shaped valve, and the length of the valve stem 4 portion is longer, so that the cold heat dissipated from the low-temperature fluid flowing inside the valve body 5 is reduced. Further, connecting pipes 6, 6 are welded to the inlet end and outlet end of the valve box 5, respectively. The jacket 3 surrounds mainly the valve body 5 and part of the connecting pipes 6, 6 of the valve body 2 while maintaining a predetermined interval, and has a shape that is almost similar to the valve body 2. The tip of the portion surrounding the upper part of the valve box 5 is welded to the top of the valve box 5, and the tip of the portion surrounding the connecting pipes 6, 6 is open.

Such a vacuum jacket valve 1 has connecting pipes 6,
The inner pipe 8 of the vacuum insulation piping 7 is welded and connected to both ends of the jacket 3, and the connecting pipes 6, 6 of the jacket 3
The outer tube 9 of the vacuum insulated piping 7 is welded and connected to the open end of the part surrounding the vacuum insulated piping 7, and the gap between the inner tube 8 and the outer tube 9 of the vacuum insulated piping 7 and the valve body 2 of the jacket valve 1 and the jacket 3 are connected. The air gap is in communication with the air gap, and the air gap is evacuated to form a vacuum heat insulating layer for use.

[Problem that the invention attempts to solve]

In the case of such a vacuum jacket valve 1, when repairing or replacing the vacuum jacket valve 1, the welding points between the jacket 3 and the outer pipes 9, 9 and the welding points between the connecting pipes 6, 6 and the inner pipes 8, 8 must be checked. After cutting the welded part and breaking the vacuum, remove the vacuum jacket valve 1.
It is necessary to repair or replace it, weld the cut point again, and evacuate it.

For this reason, there is a problem that repairing or replacing the vacuum jacket valve 1 is time-consuming and the entire vacuum insulation piping 7 becomes unusable during the repair.

[Means for solving problems]

This invention includes a valve including a valve body and a jacket surrounding the valve body, with a vacuum in the space between the valve body and the jacket, and an inner valve body connected to one open end of the valve body of the valve body. a male joint having a pipe and an outer pipe connected to the jacket, the space between the inner and outer pipes being evacuated; an inner pipe connected to the other open end of the valve body of the valve body; and an outer pipe connected to the jacket. It has a female joint in which the space between the inner and outer pipes is evacuated, and the outer pipe of the male joint can be fitted into the inner pipe of the female joint, so that the male joint and the female joint can be attached and detached. By attaching a female joint or male joint of the same shape as the female joint or male joint to the connection end of the vacuum insulated piping, the vacuum jacket valve can be easily removed without destroying the vacuum of the vacuum insulation piping and the vacuum jacket valve. And made it possible to do it quickly.

〔Example〕

FIG. 1 shows an example of the vacuum jacket valve of this invention, and reference numeral 11 in the figure indicates the valve body. This valve body 11 is a type of globe-shaped valve, and the length of the valve stem 12 is increased to reduce cold heat dissipation from the low-temperature fluid flowing inside the valve body 13. Further, connection pipes 14, 14 are connected to the inlet end and outlet end of the valve body 13 of the valve body 11, respectively, by welding or the like. Such a valve body 11 has a jacket 15 made of stainless steel or the like.
It is surrounded by a gap that becomes a vacuum space.
This jacket 15 has a shape that is almost similar to the valve body 11, and the upper end of the portion surrounding the upper part of the valve box 13 is welded to the top of the valve box 13, and the jacket 15 surrounds the connecting pipes 14, 14. The tip of the jacket 15 is open, and one end of the jacket 15 surrounding the connecting tube 14 is extended outward to form a jacket extension 16.

Furthermore, a female joint 17 and a male joint 18 are connected to the valve consisting of the valve body 11 and the jacket 15. The female joint 17 has an inner pipe 19 and an outer pipe 20.
It has a double-tube structure consisting of an inner tube 1
One end of the valve body 11 and the jacket 15 are welded to one of the connecting pipes 14 and the jacket extension 16 also serves as the outer pipe 20.
is combined with In addition, the inner pipe 1 of the female joint 17
The other end of 9 is an outer tube 20 (jacket extension 16).
It extends outward and has an enlarged diameter, and a screw 21 is formed on the outer circumferential surface of the distal end to serve as a threaded part 22, and the inner circumferential surface of the distal end is flat. The joint surface 23 is formed. Furthermore, a ring-shaped joining member 24 is provided at the base of this screwed part 22.
As a result, the distal end portion of the outer tube 20 and the inner tube 19 are joined and integrated.

On the other hand, the male joint 18 has a double-tube structure consisting of a straight inner tube 25 with a slightly smaller diameter and an outer tube 29 consisting of a joining ring 26, a joining pipe 27, and a joining pipe 28. One end of 25 is welded and joined to the open end of the other connecting pipe 14, and a joining ring 26, a joining pipe 27, and a joining pipe 28 are sequentially welded and joined to the open end of the jacket 15, so that the valve body 11 and the jacket 15 are connected to each other. is combined with The joining pipe 28 has a flat circumferential surface with a slightly larger diameter formed at the middle portion in the longitudinal direction as a joining surface 29, and an O-ring 30 for sealing is embedded in this joining surface 29. ing. Further, a ring-shaped protrusion 31 is formed on the valve body 11 side of the joint surface 29, and this protrusion 3
A cap nut 32 that locks onto the joint pipe 28 and is screwed onto the screw 21 of the threaded portion 22 is loosely fitted onto the joint pipe 28. The outer side of the joint surface 29 of the joint pipe 28 is reduced in diameter and has a thinner wall, and is joined to the end of the inner pipe 25 at its tip, and a seal made of Teflon (trademark) or the like is attached to the end of this joint. A cap 33 is attached.

Thus, the gap between the valve body 11 and the jacket 15 communicates with the gap between the inner and outer pipes of the female joint 17 and the male joint 18, and the jacket 15 communicates with the gap between the valve body 11 and the jacket 15.
If the vacuum jacket valve is evacuated using the exhaust valve 34 provided in the vacuum jacket valve, the entire vacuum jacket valve becomes a vacuum insulation structure.

The inner diameter of the inner pipe 19 of the female joint 17 is larger than the outer diameter of the joint pipe 28 which is the outer pipe of the male joint 18, and the joint pipe 28 of the male joint 18 is connected to the inner pipe of the female joint 17. It is designed so that it can be inserted into 19. Further, the outer diameter of the joint surface 29 of the male joint 18 and the inner diameter of the joint surface 23 of the female joint 17 are almost the same, so that when the male joint 18 is fitted to the female joint 17, the joint surface 23 of both ,2
9 are designed to be in close contact with each other in an airtight manner, and when the cap nut 32 is screwed into the screw 21 of the threaded part 22 in this fitted state, the female joint 17 and the male joint 18 are connected airtightly. It is configured.

In order to attach a vacuum jacket valve with such a structure to the vacuum insulated piping 7, a male joint having the same structure as the male joint 18 is joined to the end of one of the vacuum insulated piping 7 to be connected, and then A female joint having the same structure as the female joint 17 is connected to the end of the valve 7, a male joint of the vacuum insulated piping is fitted to the female joint 17 of the vacuum jacket valve, and a male joint of the vacuum insulation piping is fitted to the male joint 18 of the vacuum jacket valve. This is done by fitting the female joints and tightening the cap nuts of each male joint.

Moreover, in order to remove the vacuum jacket valve, it is sufficient to loosen both cap nuts and release the fitting.

In the case of such a vacuum jacket valve, the vacuum jacket valve can be installed and removed extremely easily without destroying the vacuum jacket valve itself or the vacuum insulation state of the vacuum insulation piping, making it easy to replace or repair the vacuum jacket valve. can be done easily and quickly.

[Effect of idea]

As explained above, the vacuum jacket valve of this invention has a male joint and a female joint that have a double-pipe vacuum insulation structure and can be fitted to each other attached to the valve body and the jacket. By attaching a fitting with the same structure as this male or female fitting to the connecting end of the vacuum insulated piping, the vacuum jacket valve and the vacuum insulated piping can be quickly and easily attached and removed without destroying the vacuum insulation structure. The vacuum jacket valve can be easily replaced and repaired. Furthermore, since the vacuum insulation structure of the vacuum insulation piping is not destroyed when the vacuum jacket valve is removed, the entire vacuum insulation piping system does not become unusable, and parts other than the part from which the valve is removed can be used without any hindrance.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing an example of the vacuum jacket valve of this invention, and FIG. 2 is a schematic sectional view showing a conventional vacuum jacket valve. 11... Valve body, 13... Valve box, 14... Connection pipe, 15... Jacket, 16... Jacket extension part, 17... Female fitting, 18... Male fitting, 1
9...Inner tube, 20...Outer tube, 21...Screw, 22
...Threaded portion, 23...Joint surface, 24...Joining member, 25...Inner tube, 26...Joining ring, 27...
...joint pipe, 28...joint pipe, 29...joint surface, 31...projection, 32...cap nut.

Claims (1)

[Scope of Claim for Utility Model Registration] A valve including a valve body and a jacket surrounding the valve body, the space between the valve body and the jacket being evacuated, and one open end of the valve body of the valve body. a male joint having an inner pipe to be connected and an outer pipe following the jacket, the space between the inner and outer pipes being evacuated; an inner pipe connected to the other open end of the valve body of the valve body; It has an outer pipe that follows the jacket, and a female joint in which the space between the inner and outer pipes is evacuated, and the outer pipe of the male joint can be fitted into the inner pipe of the female joint, so that the male joint and the female joint are connected. A vacuum jacket valve characterized by a detachable structure.