JPS62124398A - Low-temperature liquefied gas falling device - Google Patents

Abstract

PURPOSE:To prevent the deposition of water droplet, frost and ice, etc. and improve the heat insulation of a low-temperature liquefied gas falling device, by using a specific synthetic resin material for a lower member of an outer vessel surrounding a falling conduit and an upper member of an inner vessel. CONSTITUTION:The low-temperature liquefied gas falling device is constituted of an inner vessel 1, an outer vessel 8 provided around the outer periphery of the inner vessel 1 with a heat insulating portion 9, a falling conduit 1a for continuously or intermittently falling a liquefied gas in the inner vessel 1, and a nozzle 10a located at the lower end of the falling conduit 1a. The nozzle 10a, a nozzle bracket 10, a lower member 19 of the outer vessel surrounding the falling conduit 1a in continuation from the nozzle bracket 10, and an upper member 18 of the inner vessel are formed of a synthetic resin material such as unsaturated polyester, epoxy, melamine or phenol resin, or a mixture thereof. Accordingly, it is possible to prevent the deposition of water droplet, frost and ice, etc. and improve the heat insulation of the device.

Description

[Detailed Description of the Invention] ■Peel and Fruit ■ and Country Club This invention is based on the following technology: After filling an aluminum or steel can used for fruit drinks, coffee drinks, etc. with contents,
It is used to create a predetermined internal pressure by dropping liquid nitrogen into a can, and it is used to seal various chemicals and drugs used in precision science experiments. The present invention relates to a low-temperature liquefied gas flow device that can also be used when enclosing active gas.

■Roundness In recent years, the walls of cans made of aluminum or steel have been made extremely thin in order to conserve can material. Therefore, it has the disadvantage that it is easily deformed by external pressure, and in order to overcome this disadvantage, measures have been taken to increase the pressure inside the can by filling it with liquid nitrogen, for example, and supplying liquid nitrogen into the can. A liquefied gas flow device was developed as a device.

An example of a conventional liquefied gas flow down device is shown in FIG.

In FIG. 2, 1 is an inner tank made of gold LL such as aluminum or stainless steel. The low-temperature liquefied gas 3 is stored. This low-temperature liquefied gas 3 is, for example, liquid nitrogen 3a, and this liquid nitrogen 3a is supplied into the can 14 just before the M seam of the can 14 is tightened. When the low-temperature liquefied gas storage tank 2 is a self-pressurizing internal pressure container 21, the liquid nitrogen 3a supplied from the low-temperature liquefied gas storage tank 2 is heated due to gas-liquid parallelism up to atmospheric pressure and heat intrusion into the supply pipe 2a. When the low-temperature liquefied gas storage tank 2 maintains atmospheric pressure, a portion of the gas is vaporized due to heat entering the supply pipe 2a. A gas separator 4 is fixedly installed on the second plate 7 to separate the vaporized nitrogen gas 3b and liquid nitrogen 3a. At the bottom of the gas separator 4, sintered metal, a filter, etc. are inserted, or metal scraps, glass wool, rock wool, and other fibrous materials are appropriately arranged in layers. When liquid nitrogen 3a and nitrogen gas 3b pass through the gas-liquid separation layer 4a in a mixed state, the gas-liquid separation layer 4a
liquid nitrogen 3a and nitrogen gas 3b are separated by
The separated liquid nitrogen 3a is quietly stored in the inner tank 1 without boiling. The reason why liquid nitrogen 3a and nitrogen gas 3b are separated in this way is that if they are stored in a mixed state, the liquid level in the inner tank 1 will not become constant due to boiling, and that the liquid nitrogen 3a supplied to the can 14 will not become constant. This is because variations occur in the amount of dripping. The separated nitrogen gas 3b is discharged to the outside from the discharge hole 4b of the gas-liquid separator 4. The volume of liquid nitrogen 3a stored in the inner tank 1 is controlled by a liquid level control system A so that a constant amount is always stored. Specifically, the level sensor 5 has an upper limit value and a lower limit value set.
The controller 6 detects the liquid level of the liquid nitrogen 3a in the inner tank 1 that is being sent, and operates or stops the pump 20 as necessary to transfer the liquid nitrogen 3a from the low temperature liquefaction storage tank 2 to the inner tank 1.
(See Figure 3). In addition, when the low-temperature liquefied gas storage tank 2 is a self-pressurized internal pressure container 21, the liquid in the inner tank 1 is The liquid level of nitrogen 3a is maintained at a constant level (fourth
(see figure). Further, an outer tank 8 is provided outside the inner tank 1 so as to surround the inner tank 1. The outer tank 8, like the inner tank 1, is made of a material such as aluminum or stainless steel mesh. The inner tank 1 and the outer tank 8 are connected at the upper part, and a vacuum insulation part 9 filled with a heat insulating material is provided between the inner tank 1 and the outer tank 8 with a degree of vacuum of about 10-'). Inner tank 1
This prevents heat convection and radiation between the outer tank 8 and the outer tank 8.

Further, a flow conduit 1a is suspended from the bottom of the inner tank 1, and the liquid nitrogen 3a in the inner tank 1 flows down through the flow conduit la and is guided to the nozzle 10a of the nozzle bracket 10 at the lower part. Dripping into the can 14 is performed by opening and closing the nozzle 10a and the valve body 11 that engages with the nozzle 10a, and this opening and closing operation is controlled by the flow rate control system B. That is, the upper plate 7 provided at the upper part of the inner tank 1
A fixing bracket 12 is fixedly installed on the top, and a solenoid valve 13 is fixedly attached to the upper part of the fixing bracket 12. The activation and deactivation of the solenoid valve 13 causes the valve rod 11a to move up and down, and accordingly, the valve body 11 at the tip of the valve rod 11a also moves up and down, opening and closing the nozzle 10a. Can 14
The amount of liquid nitrogen 3a to be dropped is determined by setting the operating time of the solenoid valve 15. In addition, the solenoid lubricant 13 detects the presence of the can 14 below the nozzle 10a by a photoelectric switch 15 provided at the bottom of the can 14.
It starts by receiving that signal.

■-My Nephew Will Solve the Problem A Alternatively, it is made of a metal + A material with relatively low thermal conductivity such as stainless steel mesh, but since it is a metal material, its heat conduction can be ignored. When stored in the tank, a considerable amount of heat transfers between the inner tank 1 and the outer tank 8, and when the surface temperature of the outer tank 8 becomes low, moisture in the atmosphere turns into water droplets, frost, or ice. A large amount of water adheres to the surface of the outer tank 8.There is a risk that water droplets, frost, or ice may fall into the can below, which poses a serious hygiene problem.This moisture falls as water droplets, frost, or ice. This is a problem not only when the equipment is in operation, but also when it is stopped.In other words, when the equipment is stopped, it is maintained at a low temperature of -196°C, so moisture adheres to the nozzle bracket 10. In addition, air containing moisture enters from the outlet 4h, and when the device is restarted, this moisture turns into ice in the inner tank 1 that stores liquid nitrogen 3a, adheres to the nozzle 10a, and causes damage to the gas-liquid separator 4. This can cause problems such as reduced capacity, and work such as heating and removing moisture is required when restarting operation.

In addition, external heat may be transferred to outer tank 8 or nozzle bracket 1-1.
The liquid nitrogen 3a that is flowing down enters the inner tank 1 or the downstream conduit la through 0, and a part of the liquid nitrogen 3a that is flowing down becomes easily gasified by boiling in the downstream conduit 1a and the inner tank 1, and the gasified nitrogen gas 3b is Mixed into the flowing liquid nitrogen 3a,
This may cause unevenness in the amount of dripping into can 14.
There was a serious problem of uneven pressure inside the tank.

This invention was made by focusing on the problems of the prior art as described above, and by preventing water droplets, frost, and water from adhering to the surfaces of the outer tank 8 and the nozzle bracket 10, water droplets containing various bacteria can be removed. , frost, and ice from entering the can 14, as well as preventing external heat from being conducted to the inner tank 1 and the downstream conduit 1a.
The purpose is to prevent or reduce gasification due to boiling of liquid nitrogen 3a in a.

■-Concave 1 Problem 4-Angle, 'i='/j? :, t 6 Δ
In order to achieve this objective, the present invention stores the low-temperature liquefied gas 3 supplied from the low-temperature liquefied gas storage tank 2 in the state of liquid and vaporized gas, and also controls the liquid level to keep the liquid level constant. The liquid contained in the inner tank 1 is continuously supplied to the inner tank 1, which is equipped with an inner tank 1, and an outer tank 8 that is provided on the outer periphery of the inner tank 1 and surrounds the inner tank 1 via a heat insulating part 9. A downstream conduit 1a that flows down naturally or intermittently, and the downstream conduit 1a
A low temperature liquefied gas flow down device having a nozzle 10a disposed at the tip of a nozzle bracket 1.
0, the downstream conduit 1 is connected to the nozzle bracket 10;
The outer tank lower member 19 that surrounds a and the inner tank upper member 18 provided in the inner tank Ih section are made of unsaturated polyester, epoxy resin, melamine resin, phenol resin, urethane resin, silicone rubber, fluororubber, long chain polyamide, It is characterized by using one or a mixture of two or more selected from the group consisting of polyimide, polycarbonate, furan resin, polysulfone, butadiene-acrylonitrile synthetic rubber, and modified products thereof.

(2) The operation of this invention, which has a structure more than L rhyme, will be explained.

As shown in FIG. 1, the upper part of the inner tank 1 and the upper part of the outer tank 8 are connected by an inner tank upper member 18 made of a specific plastic or elastomer material. ! ! In addition, the outer tank lower member 19 provided between the lower part of the outer tank 8 and the nozzle bracket 10 is made of a specific plastic or elastomer material that has low thermal conductivity, is suitable for use at low temperatures, and does not attract water droplets or frost. 7, the heat conduction between the inner tank 1 and the outer tank 8 and between the downstream conduit 1a and the outer tank 8 is blocked, and the material itself essentially does not attract water droplets or frost. Furthermore, in this invention, the nitrogen gas 3b separated in the gas-liquid separator 4 is sprayed onto the bottom surface of the nozzle bracket 10 by the gas injection nozzle 17 through the dedicated pipe 16, so that the nitrogen gas 3b is sprayed from between the nozzle bracket IO and the can 14. In general, air containing moisture can be excluded and kept away from the nozzle bracket 10, and conditions can be created in which water droplets, frost, and ice will not form on the nozzle bracket 10. Therefore, it is possible not only to substantially eliminate heat conduction from the nozzle bracket 10 to the downstream conduit 1a and prevent heat from entering the downstream conduit la from the outside air near the nozzle bracket 10, but also to prevent moisture from entering the nozzle bracket 1-10. A feature of the present invention is that it can substantially eliminate the adhesion of frost and ice. The heat intrusion into the inside of the device as described above is caused by the use of certain plastics, elastomers, etc. The effect can be further enhanced by using different materials.

@! Jm Kan Next, the present invention will be explained based on the drawings.

The drawings are diagrams showing one embodiment of the present invention.

In the drawings, parts or members that are the same or equivalent to those of the conventional device are given the same reference numerals and redundant explanations will be omitted.

The conventional low-temperature liquid gas flow down device shown in FIG. 2 is characterized by the provision of an inner tank upper member 18 made of the above-mentioned specific plastic or elastomer material at the connection part between the inner tank 1 and the outer tank 8; The main feature is that an outer tank lower member 19 made of the above-described specific plastic or elastomer material is provided between the nozzle bracket 10 and the outer tank 8. The embodiment of the present invention shown in FIG. By using this material, it is possible to effectively prevent heat conduction and the adhesion of water droplets, frost, and ice.

As an experimental example, when comparing the heat conduction when using epoxy resin and stainless steel for such a member, epoxy resin has 2.2 cal/cmh'c and stainless steel L has 11.6 cal/cmh'c. The thermal conductivity of epoxy resin is approximately 1150 that of stainless steel.

This means that, theoretically, the height of an epoxy resin container with the same cross-sectional area is approximately 11 times the height of a stainless steel container.
50, and a resin container has the advantage of being able to reduce the height of the entire container, and there is a noticeable difference in the amount of water droplets and frost deposited on the two. Attached Table 1 below shows an experimental example in which the device according to the present invention and a conventional device are compared with respect to the amount of heat entering into the device.

Attachment 1 Materials used for the inner tank upper member I8, the outer tank lower member 19, the downstream conduit 1a, and the nozzle bracket 10 include urethane resin 1 such as unsaturated polyester, epoxy resin, melamine resin, phenol resin, and polyurethane elas 17- , silicone rubber such as silicone rubber, fluorine rubber such as fluorine-based elastomer, long-chain polyamide, polyimide, polycarbonate-1/1, furan resin, polysulfone, butadiene-7 crylonitrile-based synthetic rubber, and modifications thereof. One type or a mixture of two or more types selected from the group consisting of: Iron 6, natural rubber, etc. are conceivable, but they became brittle and damaged during use and could not withstand long-term use.

Further, in the low-temperature liquefied gas flow down device according to the present invention, a conduit 16 is connected to the discharge 1'' 4b of the gas-liquid separator 4, and a gas injection nozzle 17 is connected to the tip of the conduit 16. The gas injection nozzle 17 is fixed to the bottom of the nozzle bracket 10, and sprays the nitrogen gas 3b separated in the gas-liquid separator 4 onto the bottom of the nozzle bracket 10 and the nozzle 10a.
0 and (stone 14), and prevents moisture in the air from forming water droplets, frost, and water near the nozzle 10a of the nozzle bracket 10. Another embodiment is shown in which the gas storage tank is a self-pressurized internal pressure container 21. In this embodiment, when the apparatus is stopped, the supply of liquid nitrogen 3a is stopped, and the valve 23 of the supply pipe 2b from the internal pressure container 21 is closed. If you open it slightly, you will not be able to use any other power (
However, the nitrogen gas 3b can be supplied to the nozzle bracket 10 and the nozzle 10a in a fixed amount, preventing moisture from sticking to the nozzle lOa, gas-liquid fraction '4. It is possible to prevent a decrease in the capacity of the container 4 and to prevent moisture from entering the inner tank 1 that stores the liquid nitrogen 3a, and restarting the operation can be carried out smoothly. The dropping rate of liquid nitrogen 3a into the can 14 using the low-temperature liquefied gas flow device according to the present invention can be made very high at 500 to 1500 cans/min, but if the amount of liquid nitrogen 3a dropped is too large, If the can 14 is destroyed by the pressure of the nitrogen gas 3b, and the amount of nitrogen gas dropped is small, the strength of the can 14 will be reduced. Additionally, the device according to the present invention has control systems such as a liquid level control system A and a flow rate control system B so that a constant amount of liquid nitrogen 3a can always be accurately dropped into the can 14 moving at a high speed. However, liquid nitrogen 3a is continuously flowed down,
It is also possible to design the can so that it can be constantly dropped at a constant rate by moving the can rapidly. When the control system L is provided, the configuration of the control system can be similar to the configuration of each control system of the conventional known technology shown in FIGS. 3 and 4.

In addition, the lower surface of the -4 second plate 7 facing the inner tank 1 is covered with a heat insulating material such as polyurethane foam, a film such as Plus Sennox or Elas 1-mer that can withstand low temperature use, or glass fiber resin as appropriate. By adhering a heat insulating material (not shown) coated with a heat insulator, heat convection between the inner tank l and the plate plate 7 can be blocked, and the temperature of the upper plate 7 can be prevented from decreasing. Further, the heat insulating section 9 can be made of a normal heat insulating material 11 other than vacuum heat insulating material.

■Light - Absorption - Young - Song Dynasty - As explained above, according to the present invention, water droplets, frost, and ice (=1
Since it is possible to substantially prevent flE from entering the can, it is possible to completely prevent flE from entering the can, and to eliminate concerns regarding hygiene. Furthermore, it is possible to prevent heat from entering the inner tank and the downstream conduit, thereby eliminating gasification of liquid nitrogen due to boiling, and making it easier to always supply a constant amount of liquid nitrogen to the can. These effects are nozzle brackets.

! - Further improvement can be achieved by using the above-mentioned specific material for the members near the downstream conduit f'N1.

In addition, FIG. 5 is a graph comparing the surface temperature of each part of the outer tank and nozzle bracket of the conventional low-temperature liquefied gas flow-down device ta) and the low-temperature liquefied gas flow-down device (b) according to the present invention. This is another embodiment of the present invention, and is a graph showing the surface temperature of each part when the entire lower part of the device is made of synthetic resin.

As is clear from this graph, the surface temperature of the outer tank and nozzle bracket of the low-temperature liquefied gas flow down device according to the present invention is close to the outside air temperature.

Therefore, it is proven that the conduction of heat from the inner tank to the outer tank is significantly less.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing a low-temperature liquefied gas flow-down device of the present invention, Fig. 2 is a longitudinal cross-sectional view showing a conventional low-temperature liquefied gas flow-down device, and Fig. 3 is a longitudinal cross-sectional view showing a low-temperature liquefied gas flow-down device of the present invention. Drawings showing each control system, Fig. 4 is a drawing showing another embodiment of the present invention, and Fig. 5 shows the surface temperature of each part of the outer tank and nozzle bracket of this invention and a conventional low-temperature liquefied gas flow device. This is the graph shown. 1 - Inner tank, 2 - Low temperature liquefied gas storage tank 3 - Low temperature liquefied gas, 4 - Gas-liquid separator 8, - Outer tank, 9 - [41) i Heat section 10 - Nozzle bracket, 1oa-----Nozzle 16---1 conduit, 1
7---Gas injection nozzle 18- Inner tank upper member, 19-
-～-・Outer tank lower member 21- Internal pressure vessel, A--Liquid level control system Applicant: Takeuchi Press Kogyo Co., Ltd. Taiyo Sanso Co., Ltd. Figure 2

Claims (3)

[Claims] (1) An inner tank that stores the low-temperature liquefied gas supplied from the low-temperature liquefied gas storage tank in the state of liquid and vaporized gas, and is equipped with a liquid level control system that keeps the liquid level constant; An outer tank provided on the outer periphery and surrounding the inner tank via a heat insulating part, a flow conduit that allows the liquid contained in the inner tank to flow down continuously or intermittently, and a flow conduit at the tip of the flow conduit. A low temperature liquefied gas flow down device having a nozzle arranged at least, the nozzle, a nozzle bracket, an outer tank lower member continuous to the nozzle bracket and surrounding the flow conduit, and an inner tank provided in the upper part of the inner tank. On the upper part,
Unsaturated polyester, epoxy resin, melamine resin, phenolic resin, urethane resin, silicone rubber, fluororubber, long chain polyamide, polyimide, polycarbonate,
A low-temperature liquefied gas flowing device characterized in that one type or a mixture of two or more types selected from the group consisting of furan resin, polysulfone, butadiene-acrylonitrile synthetic rubber, and modified products thereof is used. (2) The low-temperature liquefied gas flow down device according to claim 1, further comprising a conduit and a gas injection nozzle for spraying the vaporized gas from the upper part of the inner tank onto a nozzle and a nozzle bracket. (3) The low-temperature liquefied gas flowing down device according to claim 1, wherein the low-temperature liquefied gas storage tank is a self-pressurizing internal pressure vessel.