JPS605868B2 - Solenoid valve type automatic boosting low temperature refrigerant container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a solenoid valve-type variable pressure boosting low-temperature refrigerant container for supplying low-temperature cold soot to a cooling trap, sorption pump, etc. interposed between a high vacuum chamber and an exhaust pump, for example. Regarding.

As shown in Figure 1, this type of container is equipped with a pipe b that is closed at each end between the space inside the container body a and the liquid nitrogen filling part, and a manual booster valve c is installed in the pipe b. and a heat exchanger d have been proposed, but in order to take out the liquid nitrogen with this device, the pressure increase valve c and the liquid take-out valve e are opened manually to reduce the gas pressure in the space inside the container body a. Since it is necessary to raise the liquid nitrogen, it is not allowed to pass when the removal of liquid nitrogen is automatically controlled according to the liquid level of the liquid nitrogen container to be replenished.

In the figure, f is the gas release valve (manual), g is the safety valve,
It is a vacuum insulated container. In addition, a method has been proposed in which a compressed air source is connected to the container body via a solenoid valve and the extraction of liquid nitrogen is automatically controlled by controlling the solenoid valve, but this method has the disadvantage of requiring separate equipment. be.

Furthermore, a method has been proposed in which the space inside the container body is pressurized and the solenoid valve for liquid removal is automatically controlled, but when liquid nitrogen is removed, it may spout out.
The disadvantage is that there are many losses. The present invention eliminates these drawbacks of the conventional ones, and provides a low-temperature refrigerant container that has a simple structure, is suitable for automatically controlling the removal of low-temperature refrigerant from the container, and does not cause loss of low-temperature cold soot. For this purpose, a pipe is installed at one end and the other end of which are connected to the low-temperature cold soot filling part and space in the container body, and a heat exchanger and a three-way solenoid valve are inserted in the pipe, and a heat exchanger and a three-way solenoid valve are inserted into the pipe. The valve is controlled by an electric signal to open the space to the outside space and close the pipe, or close the space to the outside space and open the pipe. . Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a three-way solenoid valve, which is inserted together with a heat exchanger 6 into a pipe 5 whose one end is closed to a space 3 inside the container body 2 and whose pond end is closed to a liquid nitrogen filling section 4.
For example, if the pipe 5 is always closed, the space 3 is opened to the outside space via the gas release valve 8, and the solenoid 7 is energized, the pipe 5 is opened and the passage between the space 3 and the outside space is closed. do. 9 is a manual liquid take-out valve, 1 is a safety valve,
11 is liquid nitrogen, and 12 is a vacuum insulation container.

Next, to explain its operation, when taking out liquid nitrogen, the liquid take-out valve 9 and the gas release valve 8 are opened, and the solenoid 7 of the three-way solenoid valve 1 is energized, the pipe 5 is opened and the outside of the space 3 is opened. Since the opening to the space is closed, the nitrogen gas generated when the liquid nitrogen 11 passes through the heat exchanger 6 is released into the space 3, the pressure there increases, and the pressure causes the liquid nitrogen 11 to close the liquid take-out valve. It flows out from 9. Thus, when the solenoid 7 is excited by a liquid level drop detection signal from a liquid level sensor (not shown) of a liquid nitrogen container for a trap, for example, the removal of liquid nitrogen from the container body 2 can be automatically controlled in accordance with the liquid level. I can do it. As described above, according to the present invention, a heat exchanger and a three-way solenoid valve are interposed in a pipe whose one end and the other end are opened into the low-temperature refrigerant filling part and the space in the container body, and the three-way solenoid valve receives an electric signal. The method opens the space to the outside space and closes the pipe under control, or closes the space to the outside space and opens the pipe. The structure is simple, and the removal of the low-temperature cold soot container from the container body can be automatically controlled in accordance with the liquid level of the low-temperature cold soot container to be replenished.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of an example of a conventionally proposed low-temperature cold soot container, and FIG. 2 is a schematic explanatory diagram of an embodiment of the present invention. 1... Three-way solenoid valve, 2... Container body, 3...
...Space part, 4...Low temperature refrigerant filling part, 5...
...Pipe, 6...Heat exchanger, 7...
Solenoid, 8...Gas release valve, 9...Liquid take-out valve, 10...Safety valve, 12...Vacuum insulation container. Screen 1 Figure 2

Claims (1)

[Claims] 1 A pipe with one end and the other open, respectively, is provided in the low-temperature refrigerant filling part and the space in the container body, and a heat exchanger and a three-way solenoid valve are interposed in the pipe, and the three-way solenoid valve is controlled by an electric signal. The solenoid valve-type automatically pressurized low-temperature refrigerant is characterized in that the space is opened to the outside space and the pipe is closed, or the space is closed to the outside space and the pipe is opened. container.