JPH0236996Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a transfer valve for low-temperature liquefied gas, particularly for transferring low-temperature liquefied gas from the bottom of an insulated container filled with low-temperature liquefied gas with a boiling point of -100°C or less under atmospheric pressure. The present invention relates to an actuator valve for low-temperature liquefied gas suitable for taking out low-temperature liquefied gas or moving low-temperature liquefied gas from an upper chamber to a lower chamber of a two-stage container in which the interior of the insulated container is divided into two upper and lower chambers.

[Conventional technology]

The inside of the insulated container is divided horizontally in the center 2
FIG. 3 shows an example of a conventional technique for moving low-temperature liquefied gas stored in an upper chamber to a lower chamber in a stage-type low-temperature liquefied gas container.

In Fig. 3, a heat insulating container 1 has an outer tank 3 and an inner tank 2.
is formed, and there is a heat insulating layer between them.
A dividing plate 6 installed horizontally in the center of the inner tank 2 divides the inner tank 2 into an upper chamber 4 and a lower chamber 4'. The low-temperature liquefied gas to the upper chamber 4 is supplied and stored, for example, from a low-temperature liquefied gas receiving pipe 7. When this low-temperature liquefied gas is sufficiently separated into gas and liquid in the upper chamber 4 to be stabilized and then transferred to the lower chamber 4', an insulated pipe 9 is provided outside the insulated container 1 and connects the upper chamber 4 and the lower chamber 4'. A valve 10 (or actuator valve) for low temperature is provided, and the low temperature liquefied gas 5 stored in the upper chamber 4 is transferred to the upper chamber 4 and the lower chamber 4 through the pipe line by opening and closing the valve 10 to the lower chamber 4'. ' is moved using the pressure difference or head difference, and becomes liquefied gas 5' in the lower chamber. Note that 8 is a pipe for taking out the liquefied gas 5'.

〔problem〕

In such a case, the insulated piping 9 and valve 10 installed outside have a defect that heat intrusion from the atmosphere causes considerable heat loss or bubbling due to vaporization of the low-temperature liquefied gas, and when the valve 10 fails, the insulated piping There were also problems in terms of maintenance management, such as the need to dismantle the insulation section.

[Purpose of invention]

The present invention was developed in consideration of these facts, and is a low-temperature liquefied gas that minimizes the influence of external thermal energy and is easy to maintain and manage when transporting and moving low-temperature liquefied gas stored in an insulated container. The purpose of the present invention is to provide an actuator valve for gas.

[Means for solving problems]

The above object of the present invention is to provide a heat insulating piping 9 shown in FIG.
Instead of attaching the valve 10 to the outside of the heat-insulating container, this can be accomplished by using the heat-insulating container itself as a valve box and providing an opening/closing part for the valve inside the heat-insulating container so that it can be operated from outside the heat-insulating container. The present invention will be explained below with reference to the drawings.

〔Example〕

As shown in FIG. 1, an externally operable actuator valve 11 according to the present invention is inserted into the upper chamber 4 of the container 1 from above the heat-insulating container 1, and by operating the valve 11, the upper chamber 4 and the lower chamber 4' The flow between the two is controlled. In this case, the actuator operation part A (Fig. 2) for operating the valve is located above the outside of the heat-insulating container, and the valve function part B (Fig. 2), which controls the flow between the upper and lower chambers, is located horizontally between the upper and lower chambers. It is located near the center of the dividing plate 6 that is divided into directions, and is operated by an operating section A. A cross-sectional view of one embodiment of the actuator valve 11 is shown in FIG. 2 together with the relevant parts of the insulated enclosure 1, which is also the valve body.

The valve seat 13 of the actuator valve is generally cylindrical and has a valve seat receiver 12 attached to a hole drilled in the center of the dividing plate 6.
It has been received well. A valve disk 14 that abuts the valve seat 13 is screwed to the tip of a valve rod 15 that extends downward from the upper actuator section A.
The valve disk 14 moves up and down as the valve stem 15 moves up and down, and cooperates with the valve seat 13 to open and close the space between the upper and lower chambers. The valve seat receiver 12 has a through hole in the center, the lower part forms a sleeve to which the thin-walled outlet pipe 32 is connected, and the upper part has a shape, for example, a stepped shape with different diameters, to fit and fix the valve seat 13. ing. Valve seat receiver 12, outlet pipe 32
Both are made of a material such as stainless steel, and are connected by brazing, welding, or the like. The outlet pipe 32 extends vertically downward so as to reach below the liquid level assumed during normal operation of the low temperature liquefied gas 5' in the lower chamber 4'. Valve seat 1
3 is the valve seat receiver 12 when fitted to the valve seat receiver 12.
The mating surface is formed to have a shape and size that maintains airtightness between the mating surface and the mating surface, and examples of materials that have good low-temperature properties and appropriate hardness are used, such as fluorine-based resin such as the product name Daiflon. .

In order to connect the operating part A and the valve function actuating part B and maintain the function of the heat insulating container 1, a valve mounting protrusion C is provided.
is provided at the upper part of the heat insulating container 1. A valve stem 15 passing through this valve mounting part C and a partition tube 17 surrounding the valve stem 15 connect the upper operation part A and the valve function part B. Partition tube 17
has the function of separating the valve stem 15 from the low-temperature liquefied gas 5 and its gas phase, and also holding the valve seat 13 in a predetermined position. Valve seat 13 is partition tube 17
It has a cylindrical shape with approximately the same diameter as the valve disk 14, and has a small-diameter stepped portion at the bottom that contacts the valve disk 14 to perform a sealing action, and a plurality of small holes 30 are provided in the side wall. Further, a male thread is provided on the outer periphery of the upper part, which is engaged with a female thread provided at the lower end of the partition tube 17, and by pressing the partition tube 17 downward, the valve seat 13 is held in an airtight manner against the valve seat receiver 12. Partition tube 17
The upper end of the valve stem 15 is connected to an operating cylinder 33 of the operating section A, and the upper end of the valve stem 15 is connected to a piston 34 that slides within this cylinder 33.

A circular hole is machined in the inner tank 2 of the upper chamber 4 concentrically with the valve stem 15 and the partition tube 17, and a flat ring-shaped seal pipe receiver 29 is provided in the hole, and the outer part of the inner tank is provided with a seal pipe receiver 29. The lower end of the vacuum seal pipe 27 is fixed to the tank 2 and its inner surface by welding, and the upper end of the vertically fixed vacuum seal pipe is fixed to the inner surface of the cylindrical spacer 25 provided on the protrusion C by the same means. be done.

In addition, the outer tank 3 of the heat-insulating container 1 is made with a hole of a larger diameter that is concentric with the vacuum seal pipe 27.
The lower part of the outer tube 28 is fixed to the inner surface of the hole by welding, and the upper end thereof is fitted to the outer periphery of the spacer 25 and fixed by welding or the like.

In order to maintain an airtight fit between the valve seat 13 and the valve seat receiver 12 via the partition rod 17, a spring is used in the protrusion C to connect the partition tube 1.
7 is biased downward. In this manner, the spring box 18 for attaching the partition tube 17 is fitted into the spacer 25 and fixed by welding or the like. Note that the spacer 25 and the spring box 18 can also be integrated.

A spring receiver 20 is fixed to the outer surface of the partition tube 17 corresponding to the inner surface of the spring box 18 by welding or stepping. The spring 2 is placed above the spring receiver of the partition tube 17.
2. Insert the spring retainer 21 and adapter 24 around the tube, and fix them to the spring box with the gland nut 19 via the packing 23 for airtightness. Nut 19 and spring box 18
A gasket 26 is placed between the two. The spring 22 is a compression spring that presses the tube 17 downward, holds the valve seat 13 against the valve seat receiver 12, and absorbs expansion and contraction of the tube 17 due to temperature changes. The partition tube 17, spring receiver 20, spring 22, spring retainer 21, and gland nut 19 are preferably made of stainless steel with excellent low-temperature properties, and the adapter 24 and packing 23 are made of fluoride resin, such as Teflon (trade name). It will be done.

The space 41 formed between the partition tube 17 and the vacuum seal pipe 27 with the above-described configuration is under the gas phase atmosphere of the upper chamber 4, and the adapter 2
4. It is isolated from the outside air by the packing 23, gland nut 19, spring box 18, and gasket 26. On the other hand, the heat insulating space 42 formed by the vacuum seal pipe 27, the outer tube 28, and the spacer 25 prevents heat from entering from the atmosphere by vacuum and/or other heat insulating means.

The partition tube 17 corresponding to the upper part of the space 41 is provided with a plurality of holes 31 for venting gas.

The operating section A for operating the valve disk of the valve function section B is shown including the cylinder 33 and piston 34 described above. The end of the cylinder 33 is covered with a cylinder cover 36, and the cover 36 and the piston 3
A compression spring 35 is inserted between 4 and 4. When air pressure is applied through the cylinder port 38, the piston 34 moves upwardly with the valve stem 15 against the spring 35, displacing the valve disc 14 from the valve seat 13 and opening the valve. When the air pressure is released, the valve disk 14 is moved downward by the spring 35 to close the valve port. Air pressure can be controlled using a solenoid valve (not shown) or the like.

The valve disk 14, which is involved in opening and closing the valve, can slide within the valve seat 13, and its lower part is stepped with a shorter diameter than the upper part, and its lower end is tapered, so that the stepped lower part of the valve seat 13 A valve end is formed for the short diameter protrusion of the valve. When the low-temperature liquefied gas 5 stored in the upper chamber 4 and having a pressure difference or a head difference with respect to the outlet side is pulled up by vertical movement of the valve disk 14, for example, the valve seat 1 is moved through the thin hole 30.
3, and moves along the outer periphery of the valve end of the valve seat 13 to the outlet pipe 32. The low-temperature gas vaporized around the valve disk 14 rises in the space 41 from the gap between the valve disk 14 and the valve seat 13, passes through the space 42 through the plurality of holes 31 provided in the partition tube 17, and enters the gas phase in the upper chamber 4. It is refluxed to the department. Isolation of the space 41 from the outside air is achieved by an O-ring 37 provided on the upper part of the valve stem 15.

The vertical movement of the valve disk 14 and valve stem 15 is performed by the aforementioned actuator mechanism provided on the protrusion of the heat insulating container 1. By attaching a positioner to this mechanism, it is also possible to control the flow rate of the low temperature liquefied gas to be moved.

In addition, the valve stem 15 is desirably as small in diameter as possible in order to measure heat insulation efficiency, and for the same reason, it is also desirable that the partition tube 17 and the vacuum seal pipe 27 be made of thin stainless steel pipes.

In the present invention, since the structure is as described above, when replacing the valve disk 14, valve seat 13, etc., the threaded engagement between the upper end of the partition tube 17 and the cylinder 33 is separated. Valve stem 1
5. It is possible to pull out the valve disk 14 upwards, and also attach the gland nut 19 to the spring box 1.
8, the partition tube 17 and valve seat 13, including the above-mentioned parts, can be easily pulled out upwards, and maintenance management, parts replacement, etc. can be easily performed. Note that there is no effect on the heat insulating layer of the container during these decompositions.

Although the present invention has been explained with reference to the illustrated embodiments, the structure thereof is not limited to that illustrated and described, and various modifications and variations may be made.
Changes are possible.

For example, the actuator can be operated by moving the valve stem using a combination of a rack and pinion, or by moving a rotary screw in the axial direction, in addition to the illustrated example.

In addition, in the embodiment, the movement of low-temperature liquefied gas from the upper chamber to the lower chamber was explained. It is also possible to adopt a configuration for extracting the liquefied gas inside. In this case, the illustrated dividing plate 6 serves as the bottom of the container, and its lower surface may serve as a heat insulating layer.

〔effect〕

As explained above, in this invention, the container containing the low-temperature liquefied gas itself is used as the valve box, and all the mechanisms except the actuator operation part are built inside the valve box, so the effect of thermal energy intruding from the outside is It is extremely easy to maintain and manage, as it is less exposed to heat, can move low-temperature liquefied gas in a stable state, and can be disassembled and assembled regardless of the insulation layer.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing a heat insulating container for low temperature liquefied gas incorporating an actuator valve according to the present invention, Fig. 2 is a partial sectional view showing the valve mechanism of Fig. 1, and Fig. 3 is a conventional one. FIG. 2 is a schematic diagram illustrating the technique. In the drawing, 1: insulation container, 4: upper chamber, 4':
Lower chamber, 5.5': Low temperature liquefied gas, 6: Dividing plate (bottom), 12: Valve seat holder, 13: Valve seat, 14: Valve disk, 15: Valve stem, 17: Partition tube, 2
2: Spring (elastic means), A: Operation section, B:
Valve function part, C: Valve mounting protrusion.

Claims (1)

[Claims for Utility Model Registration] [1] A heat-insulating container having a chamber for storing low-temperature liquefied gas; A valve seat holder provided at the bottom of the chamber and having a through hole; an extending vertically movable valve stem; a valve disk attached to the tip of the valve stem; a cylindrical valve seat fitted in the valve seat holder, in which the valve disk slides in its inner hole; a valve seat forming a valve opening that can be opened and closed together with the valve disk; an operating part connected to the valve stem at the upper part of the valve stem for controlling vertical movement of the valve stem; connected to the valve seat; a partition tube extending between the valve seat and the operating portion to surround the valve stem; and an elastic means for elastically pressing the valve seat against the valve seat receiver via the partition tube. Actuator valve for low temperature liquefied gas. [2] The actuator valve for low-temperature liquefied gas according to item 1, wherein the chamber is divided into two upper and lower chambers by a horizontal dividing plate, and the bottom portion is the bottom of the upper chamber. [3] The actuator valve for low-temperature liquefied gas according to item 1 or 2, wherein the elastic means is attached to the outside of the container at a portion where the partition tube penetrates the container.