JPH08135897A - Cryogenic liquid transfer device - Google Patents

Abstract

PURPOSE: To reduce labor and prevent the overflow of cryogenic liquid by automatically pouring the cryogenic liquid into an another container and automatically stopping the pouring. CONSTITUTION: A cryogenic liquid transfer device is constituted so that a pipe in a first cryogenic liquid accommodation container 1 is pressurized when a balloon 12 is pressed, while if the balloon is released, a valve is opened by generating a negative pressure, and the cryogenic liquid is pumped up, and supplied into a second cryogenic liquid accommodation container 20. A pouring valve 23 which is connected with the balloon 12 and generates a negative pressure in the pipe, leak valve 25 for releasing the pressure in the first accommodation container and a cryogenic liquid detecting sensor 29 installed in the discharge pipe of the second accommodation container are provided, and the cryogenic liquid is automatically pumped up by opening and closing the pouring valve 23 in a prescribed timing, and the leak valve 25 is opened by the low temperature liquid detecting sensor 29, and the pumping-up of the cryogenic liquid is suspended.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an SCM (superconducting magnet)
The present invention relates to an apparatus for transferring a low-temperature liquid (low-temperature liquefied gas) such as liquid nitrogen from another container into an apparatus (hereinafter, referred to as an SCM apparatus) that uses the above.

[0002]

2. Description of the Related Art In an SCM apparatus, liquid helium or liquid nitrogen must be used for coil cooling, and the liquid helium or liquid nitrogen to be consumed must be replenished periodically. A conventional liquid nitrogen injection device for that purpose will be described with reference to FIG.

A pump device 2 is mounted on an upper portion of a liquid nitrogen storage container 1 for storing liquid nitrogen. The pump device 2 includes an outer cylinder 3, an inner tube 5, a middle tube 6 and an outer tube 7 which are concentrically arranged in the outer cylinder 3, and a bellows 9 which is arranged on the outer circumference of the outer cylinder 3. Sphere 10 provided at the lower end of the inner tube 5
A valve 11 provided at the lower end of the middle pipe 6, a pressurizing pipe 8 connected to the upper end of the middle pipe 6, a balloon 12 connected to the pressurizing pipe 8, an upper end of the inner pipe 5 and a bellows 9 are connected. A return hose 13, a liquid supply hose 15 connected to the upper end of the outer pipe 7, a discharge pipe 14 provided on the bellows 9, and a cap 16. The bellows 9 includes a liquid nitrogen storage container 1
An opening 17 that communicates with is formed.

The injection operation will be described. When the balloon 12 is pushed, the valve 11 is lowered and the pressure in the liquid nitrogen storage container 1 is increased through the middle pipe 6 and the inner pipe 5 of the pump device 2, but the valve 11 is lowered. Liquid nitrogen cannot be pumped. When the balloon 12 is released, the pressure in the middle pipe 6 and the outer pipe 7 becomes lower than the pressure in the liquid nitrogen storage container 1, so that the valve 11 goes up and liquid nitrogen is pumped up, so that the liquid supply hose 15 moves to the SCM device. Some of the liquid nitrogen sent is the inner tube 5, the return hose 13, the bellows 9, the opening 17
After returning to the inside of the liquid nitrogen storage container 1, the pressure inside the liquid nitrogen storage container 1 is increased. When stopping the pumping of liquid nitrogen, the cap 16 is removed and the pressure in the liquid nitrogen storage container 1 is released through the discharge pipe 14.

[0005]

However, in the above-mentioned conventional liquid nitrogen injecting apparatus, when the balloon 12 is pushed, the inside of the liquid nitrogen storage container 1 is pressurized through the middle tube 6 and the inner tube 5 to open the balloon 12. When separated, the inside tube 6 and the outer tube 7 are made to have a negative pressure to pump up liquid nitrogen and supply the liquid nitrogen to the SCM device. Since it stops, there is a problem that the balloon 12 must be operated for a long time of about 20 minutes when injecting about 30 liters by one refill, and further, when the liquid nitrogen in the SCM device becomes full. Liquid nitrogen overflows from the exhaust pipe of the SCM device. At this time, if the operator is not nearby and does not remove the cap 16, the liquid nitrogen overflows and breaks the floor. Liquid nitrogen in order to have a problem that is wasted.

The present invention is to solve the above-mentioned conventional problems. By automatically injecting a low temperature liquid such as liquid nitrogen into another container and automatically stopping it, the labor can be reduced and the low temperature can be reduced. It is an object of the present invention to provide a low temperature liquid transfer device capable of preventing liquid from overflowing.

[0007]

In order to achieve the above object, a cryogenic liquid transfer device of the present invention comprises an inner pipe, a middle pipe and an outer pipe which are concentrically arranged in a first cryogenic liquid storage container. ,
A valve is provided at the tip of the middle tube, and when the balloon is pushed, the valve is closed to pressurize the inside of the first cryogenic liquid storage container through the middle tube and the inner tube, and when the balloon is released, the middle tube and In a low-temperature liquid transfer device that opens the valve by drawing a negative pressure in the outer pipe to draw the low-temperature liquid from the outer pipe and supply the low-temperature liquid to the second low-temperature liquid storage container, the low-temperature liquid transfer device is connected to the balloon and the negative pressure in the pipe is reduced. An injection valve for adjusting the pressure, a leak valve for releasing the pressure in the first cryogenic liquid storage container, and a cryogenic liquid detection sensor provided in the discharge pipe of the second cryogenic liquid storage container. A low-temperature liquid is automatically pumped up by opening and closing the injection valve at a predetermined timing, and the leak valve is opened by the low-temperature liquid detection sensor to stop pumping the low-temperature liquid. And it is characterized in and.

[0008]

In the present invention, after first pressing the balloon several times to pressurize the inside of the first cryogenic liquid container, the injection valve is opened / closed to forcibly make the inside of the pipe a negative pressure, When the cryogenic liquid is automatically pumped up and the second cryogenic liquid storage container is filled with the cryogenic liquid, this is detected by the cryogenic liquid detection sensor to release the pressure in the first cryogenic liquid storage container and Automatically shut off the supply of. Therefore, the low-temperature liquid can be automatically injected into the second low-temperature liquid storage container and automatically stopped, which reduces labor and prevents the low-temperature liquid from overflowing.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show one embodiment of a cryogenic liquid transfer apparatus of the present invention, FIG. 1 is an overall configuration diagram, and FIG. 2 is a flow chart for explaining a processing flow. In the present embodiment, the transfer of the liquid nitrogen from the liquid nitrogen storage container to the SCM device will be described as an example, but the present invention is not limited to the liquid nitrogen and the SCM device. It can be applied when transferring a low temperature liquid from the low temperature liquid storage container to the second low temperature liquid storage container.

FIG. 1 shows a liquid nitrogen storage container (first low temperature liquid storage container according to the present invention) 1, a pump device 2, a pressurizing pipe 8, which constitutes the conventional liquid nitrogen injection device described in FIG.
The SCM device connected to the injection pipe 19 by the discharge pipe 14, the balloon 12 and the liquid supply hose 15 (second in the present invention)
The cryogenic liquid storage container 20) is shown, and the present invention is the liquid nitrogen injection device of FIG. 3 to which a transfer device 21 surrounded by a dashed line is added.

The transfer device 21 includes a three-way joint 22 connected to the pressurizing pipe 8, a balloon 12 connected to one port of the three-way joint 22, and an injection valve 23 composed of a solenoid valve connected to the other port. , A leak valve 25 connected to the discharge pipe 14, a motor 26 for opening and closing the leak valve 25, and S
Liquid nitrogen detection sensor (low-temperature liquid detection sensor) 29 provided in the discharge pipe 27 of the CM device 20, an infrared signal transmission unit 30 that outputs infrared light based on a detection signal of the liquid nitrogen detection sensor 29, and a transfer control device 31 and 31 are provided.

Further, the transfer control device 31 includes an operating section 32 having a power switch, an automatic injection switch, an operation display lamp, etc., and an injection valve 23 based on an instruction from the operating section 32.
Injection valve opening / closing timing setting to control opening / closing
The output unit 33, the infrared signal receiving unit 35 that receives a signal from the infrared signal transmitting unit 30, and the liquid nitrogen in the SCM device 20 are determined based on the signals of the infrared signal receiving unit 35, and the output unit 33 And a full tank determination unit 36 that outputs a signal to the motor 26.

The operation of the transfer control in the present invention having the above structure will be described with reference to FIG. First, the injection valve 23 and the leak valve 25 are closed (step S1), and the worker presses the balloon 12 several times in this state (step S1).
2) The pressure in the liquid nitrogen storage container 1 is gradually increased via the middle pipe 6 and the inner pipe 5 in FIG. When the balloon 12 is pushed away several times, the operator passes through the outer tube 7 and the liquid supply hose 1
Check if liquid nitrogen has flowed to 5 (step S3),
When the switch of the operation unit 32 is turned on (step), the injection valve 23 is set at a predetermined timing (for example, 30 by an output signal of the injection valve opening / closing timing setting / output unit 33).
Opening / closing is controlled by once a second for 1 second and once for 2 minutes for 2 seconds (step S5). At this time, the gas in the liquid nitrogen storage container 1 is released by a slight opening operation of the injection valve 23, and the pressures in the middle pipe 6 and the outer pipe 7 described in FIG. Since it lowers, the valve 11 is raised to pump up liquid nitrogen and send it from the liquid sending hose 15 to the SCM device, and some liquid nitrogen is sent to the inner pipe 5, the return hose 13, the bellows 9, and the opening 17.
After returning to the inside of the liquid nitrogen storage container 1, the pressure inside the liquid nitrogen storage container 1 is increased, and the next timing of release by opening the injection valve 23 is waited.

When the inside of the SCM device 20 is filled with liquid nitrogen and the liquid nitrogen overflows from the discharge pipe 27, the liquid nitrogen detecting sensor 29 detects it (step S6), and this signal is transmitted by the infrared signal transmitting section 30. When the signal for driving the motor 26 is output via the infrared signal receiving section 35 and the signal for driving the motor 26 is output to open the leak valve (step S7) to release the pressure in the liquid nitrogen storage container 1. ,
The supply of liquid nitrogen is automatically stopped.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications can be made. For example, in the above embodiment,
Although the liquid nitrogen in the SCM device 20 is determined to be full and is transmitted / received by an infrared signal, the liquid nitrogen detection sensor 29 and the full determination unit 36 may be directly connected by wiring.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a cryogenic liquid transfer device of the present invention.

FIG. 2 is a flowchart for explaining the flow of processing in the present invention.

FIG. 3 is a sectional view showing a conventional liquid nitrogen injection device.

[Explanation of symbols]

1 ... Liquid nitrogen storage container (first low temperature liquid storage container), 2
... Pump device 5 ... Inner pipe, 6 ... Middle pipe, 7 ... Outer pipe, 11 ... Valve, 12 ...
Balloon 20 ... SCM device (second cryogenic liquid storage container), 23 ...
Injection valve 25 ... Leak valve, 27 ... Discharge pipe 29 ... Liquid nitrogen detection sensor (liquid liquid detection sensor)

Claims (1)

[Claims] 1. An inner tube, a middle tube and an outer tube, which are concentrically arranged in a first cryogenic liquid storage container, and a valve provided at a tip of the middle tube, wherein the valve is provided when a balloon is pushed. Is closed to pressurize the inside of the first cryogenic liquid storage container through the middle pipe and the inner pipe, and when the balloon is released, the inside pipe and the outer pipe are made to have a negative pressure to open the valve to pump the cryogenic liquid from the outer pipe. In a cryogenic liquid transfer device for supplying a cryogenic liquid to a second cryogenic liquid container, an injection valve connected to the balloon for making a negative pressure in the pipe, and a pressure in the first cryogenic liquid container. And a low temperature liquid detection sensor provided in the discharge pipe of the second low temperature liquid storage container, and automatically opens and closes the low temperature liquid by opening and closing the injection valve at a predetermined timing. Pumping up, A cryogenic liquid transfer device, wherein the leak valve is opened by the cryogenic liquid detection sensor to stop pumping of the cryogenic liquid.