JPH01150775A - Cryogenic refrigerant feeder - Google Patents

Abstract

PURPOSE: To provide a highly reliable inexpensive cryogenic refrigerant supplying device which does not cause any failure by providing a control means which switches a flow passage switching means to the atmosphere side when a cryogenic refrigerant flows without being heated to a prescribed temperature after the temperature in a transfer pipe is detected and an object to be cooled is cooled or a power failure occurs. CONSTITUTION: Usually, a cryogenic refrigerant flows to a heater 7 through a three-way valve 10 after cooling an object 3 to be cooled. When the heat load to the object 3 becomes abnormal and such abnormality as the disconnection of the heater 7, etc., occurs, the temperature drop at a normal-temperature pipeline 8 is detected by means of a temperature switch 12 and the cryogenic refrigerant flowing out from the object 3 is made to flow to a cryogenic refrigerant discharge pipe 11 so as to prevent the refrigerant from flowing in the transfer pipeline 8. When a power failure occurs, the temperature switch 12 becomes inoperable, but the three-way valve 10 is always maintained in such a normal state that the valve 10 can be connected to the discharge pipe 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cryogenic refrigerant device, and particularly in a case where the cryogenic refrigerant supply source and the object to be cooled are installed far apart.

The present invention relates to a cryogenic refrigerant supply device suitable for cases where long transfer piping is required.

[Conventional technology]

In cryogenic equipment, cryogenic refrigerant transfer piping with high vacuum insulation is used to transfer the cryogenic refrigerant. This is to reduce heat loss in the transfer piping and to prevent frost formation and dew condensation on the transfer piping. For this reason, the cryogenic refrigerant transfer piping is equipped with an outer pipe on the outside of the refrigerant pipe, which is maintained at a high vacuum between the outer pipe and the refrigerant pipe, and a laminated insulation material is installed between the outer pipe and the refrigerant pipe. . In addition, it is expensive because it requires a support for the refrigerant pipe and a bellows to absorb the expansion and contraction of the refrigerant pipe, resulting in a very complicated structure.

Therefore, in the system design of the cryogenic refrigerant supply device, consideration is given to reducing the length of the cryogenic refrigerant transfer piping as much as possible. Hereinafter, a case will be explained using liquid nitrogen as an example of the liquefied gas.

FIG. 3 is a block diagram showing an example of the configuration of a conventional cryogenic refrigerant supply device. In FIG. 3, 1 is a cryogenic refrigerant supply source, such as a liquid nitrogen tank.

2 is a cryogenic refrigerant transfer pipe for transferring liquid nitrogen, 3 is an object to be cooled, 4 is a liquid nitrogen supply valve, 6 is a cryogenic refrigerant transfer pipe for transferring gaseous nitrogen, and 7 is a heating means, such as a heater type heating device. The warming device 8 is a transfer pipe for transferring heated gas and nitrogen.

Next, the operation of the conventional cryogenic refrigerant supply device configured as described above will be described. Liquid nitrogen, which is a cryogenic refrigerant, passes from a liquid nitrogen tank 1 through a cryogenic refrigerant transfer pipe 2,
It is supplied to the object to be cooled 3.

The amount of liquid nitrogen is regulated by a liquid nitrogen supply valve 4.

The cryogenic nitrogen gas that has cooled the object to be cooled 3 passes through a cryogenic refrigerant transfer pipe 6, is heated to room temperature by a heater-type warmer 7, and then passes through a transfer pipe 8 and is released into the outdoor atmosphere. .

Note that related devices of this type include, for example, Japanese Unexamined Patent Publication No. 57-41555.

[Problem that the invention seeks to solve]

In the conventional cryogenic refrigerant supply device with the above configuration and operation, when there is an abnormality in the heating device such as a power outage or a heater disconnection, or when there is an abnormal heat load due to an air leak or water leak on the side of the object to be cooled 3, etc. However, the supply can be stopped using the liquid nitrogen supply valve 4.

Regarding the amount of cryogenic refrigerant that has already been sent into the object to be cooled 3, it is inevitable that the cryogenic refrigerant will flow into the transfer pipe.

When the cryogenic refrigerant flows into the transfer pipe 8, dew condenses.

In addition to frost formation, the transfer piping also expands and contracts, which has the disadvantage of requiring measures to prevent dew and absorb expansion and contraction.

Additionally, depending on the structure of the transfer piping, it may be difficult to absorb expansion and contraction, making it impossible to use transfer piping for room temperature use, and having to use expensive cryogenic refrigerant transfer piping. .

An object of the present invention is to provide an inexpensive and highly reliable cryogenic refrigerant supply device that has a branch point on the outlet side of the object to be cooled and switches the flow path at the branch point in case of an abnormality so as not to cause malfunction of the device. It's about doing.

[Means for solving problems]

The present invention provides a cryogenic refrigerant supply source, an object to be cooled, a cryogenic refrigerant transfer pipe that transfers the cryogenic refrigerant from the cryogenic refrigerant supply source to the object to be cooled, and a In a cryogenic refrigerant supply device comprising a heating means for heating a cryogenic refrigerant and a transfer pipe for transferring the refrigerant heated by the heating means, the transfer pipe side and the atmosphere are connected to the outlet side of the object to be cooled. a flow path switching means for switching the flow path of the branch by branching to the side; This is achieved by providing a control means for switching the flow path switching means to the atmospheric side when the flow occurs or when there is a power outage.

[For production]

A branch point is provided on the outlet side of the object to be cooled, and the flow path at the branch point can be automatically switched in the event of an abnormality, so there is no problem with the device, and the system is inexpensive and highly reliable.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In FIG. 1, 11 indicates the same members as in FIG. 3, which is the conventional example. 1, the difference from FIG. 3 is that a flow path switching means, for example, a three-way valve 10, is provided at the introduction part of the warmer 7 in the middle of the cryogenic refrigerant transfer pipe 6, and one of the outlet sides of the three-way valve 10 is It is connected to the introduction part of the humidifier 7, and a cryogenic refrigerant transfer pipe is connected to the other end, and a controller, such as a temperature switch, which is a control means for the three-way valve 10 is connected to the outlet side of the warmer 7. The three-way valve 1o is connected to the three-way valve 1o.

In the above configuration, normally, the low-temperature refrigerant that has cooled the object 3 to be cooled flows to the warmer 7 through the three-way valve 1o. In the event of an abnormality such as an abnormal heat load on the object to be cooled 3 or a disconnection of the heater, the temperature switch L detects a decrease in the concentration in the Jokai piping 8, and the three-way valve 10 is switched to stop the cryogenic refrigerant flowing out from the object to be cooled 3. The cryogenic refrigerant is flowed through the cryogenic refrigerant discharge pipe 11 to prevent the cryogenic refrigerant from flowing into the transfer pipe 8. During a power outage, the temperature switch 12 will not operate and a switching command to the three-way valve 1o will not be issued, but the three-way valve 10 is always connected to the cryogenic refrigerant discharge pipe 11 in a normal state.

FIG. 2 is a structural diagram showing an example of a three-way valve.

In Figure 2, ■ is the valve box, n is the valve stem, O is the upper valve seat,
Sae is the lower valve seat, 5 is the upper valve body, and 3 is the lower valve body. As shown in FIG. 2, when the valve pj22 is in the lower position, fluid flows in from a and flows out to b.

When valve stem n moves upward, fluid flows in from a and flows out to C. For example, b is connected to the cryogenic refrigerant discharge pipe 11, and C is connected to the warmer 7, and air is supplied from an air supply source (not shown) to the operation part of the three-way valve 10 using an electric signal from the sea level switch 12. and move the valve stem n up and down to switch the three-way valve lO. If the temperature inside the cryogenic refrigerant discharge pipe 11 is above a predetermined temperature, the moisture switch operates to send air to the three-way valve 10, raise the valve stem ρ to open C, and release the cryogen to the warmer 7 side. Allow low temperature refrigerant to flow. When the air stops, the valve stem n lowers and b opens quickly and connects to the cryogenic refrigerant discharge pipe 11 side. By using a three-way valve as shown in FIG.

Either b or c is always in the open state, and conversely, the liquid nitrogen supply valve 4 and subsequent ones can be kept in the open state.
The cryogenic refrigerant in the object to be cooled 3 can escape through either b or c, ensuring system reliability.

In this embodiment, the three-way valve is installed in the cryogenic transfer pipe 6 in front of the warmer 7, but it may be placed near the warmer 7 as long as it does not adversely affect the transfer pipe 8. , transfer piping 8
It may be provided in the section. Alternatively, the transfer pipe 8 may be connected to a refrigerator, such as a He refrigerator, to recover the heated refrigerant. However, the refrigerant discharged from the cryogenic refrigerant discharge pipe 11 is not recovered.

According to this embodiment, a three-way valve is provided, and in the event of an abnormality, the cryogenic refrigerant is released to the cryogenic refrigerant discharge pipe side, and the cryogenic refrigerant is not allowed to flow into the transfer pipe, so the normal temperature pipe is connected to the transfer pipe. In addition, since there is no need for measures against frost or dew condensation on pipes for room temperature use, and for an expansion/contraction absorption mechanism, there is an effect that the cryogenic refrigerant supply device is inexpensive and reliable.

〔Effect of the invention〕

According to the present invention, when a branch point is provided on the outlet side of the object to be cooled, the flow path at the branch point can be automatically switched in the event of an abnormality, so that the device is not malfunctioning and is inexpensive and highly reliable. It has the effect of being able to

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a cryogenic refrigerant supply device which is an embodiment of the present invention, Fig. 2 is a detailed view of part A in Fig. 1, and Fig.
The figure is a block diagram showing a conventional cryogenic refrigerant supply device. l...Liquid nitrogen tank, 2...Cryogenic refrigerant transfer piping, 3...Object to be cooled, 7...
・Warmer, 10...Three-way valve, hill...Temperature switch Patent attorney Katsuo Ogawa. ~ Figure 2

Claims (1)

[Claims] 1. A cryogenic refrigerant supply source, an object to be cooled, a cryogenic refrigerant transfer pipe that transfers the cryogenic refrigerant from the cryogenic refrigerant supply source to the object to be cooled, and a cryogenic temperature after cooling the object to be cooled. In a cryogenic refrigerant supply device comprising a heating means for heating a refrigerant and a transfer pipe for transferring the refrigerant heated by the heating means, the transfer pipe side and the atmosphere side are connected to the outlet side of the object to be cooled. a flow path switching means for switching the flow path of the branch by branching into the flow path;
control means for detecting the temperature in the transfer pipe and switching the flow path switching means to the atmospheric side when the cryogenic refrigerant after cooling the object to be cooled flows without being heated to a predetermined temperature or when a power outage occurs; A cryogenic refrigerant supply device characterized by being provided with.