JPH04139367A - Device for supplying refrigerant such as liquid nitrogen - Google Patents

Abstract

PURPOSE:To prevent gas generated after gasification of refrigerant from being forcibly blown against a cooled part by a method wherein a taking-out port of a taking-out mechanism is provided with a heat-insulated fractionating device having a gas discharging port at its upper part, a liquid outlet port at its lower part. CONSTITUTION:A peripheral part of a liquid feeding pipe 10, a peripheral part of a main body 14 of a fractionating device and a tub 28 for feeding refrigerant from a liquid outlet port 18 to a cooled part 26 are covered by heat-insulating materials 20, 22 and 24, respectively. As an electrical current flows in a heater 34 while a leakage pipe 8 is being closed, refrigerant in a storing container 2 is partially gasified, its pressure is increased, the refrigerant passes from a taking-out pipe 6 through a liquid feeding tube 10 and a fractionating device 12 and is supplied to a cooled part 26. As its liquid surface reaches its specified level, the electrical energization for the heater 34 and a supplying of refrigerant are stopped through a controller 32 with a signal from a liquid surface sensor 30. After this operation, as an amount of refrigerant at the cooled part 26 is decreased, the heater 34 is electrically energized again and the refrigerant is supplied. At this time, mixture of refrigerant and gasified gas from the liquid feeding tube 10 is supplied to the fractionating device 26. The gasified gas is discharged from a gas discharging port 16 at the main body 14 if the fractionating device and the liquid refrigerant is supplied from the liquid taking-out port 18 to the cooled part 26.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a refrigerant supply device used to supply and cool a refrigerant such as liquid nitrogen or liquid air to a sample or a detector of an analyzer. It is.

(Prior art) Refrigerant supply devices such as liquid nitrogen include refrigerant storage containers,
Some are equipped with a refrigerant extraction mechanism such as a siphon, a liquid feeding piping section, and a liquid feeding controller.

A cooled part that is cooled by being supplied with a refrigerant from a refrigerant supply device is provided with, for example, a sensor that detects the liquid level of the refrigerant.

The refrigerant extraction mechanism is provided with a heater that vaporizes the refrigerant in order to increase the pressure of vaporized gas in the refrigerant storage container and send out the refrigerant. Further, the liquid sending piping section is thermally insulated to prevent vaporization of the refrigerant.

(Problem to be Solved by the Invention) In order to maintain a constant amount of refrigerant accumulated in the cooled part and to keep the refrigerant liquid level constant, the liquid feed controller responds to the signal from the sensor of the cooled part. The liquid is fed intermittently. Therefore, the liquid feeding piping section is filled with a mixture of vaporized gas and liquid refrigerant. This is because liquid refrigerant is mainly sent during liquid feeding, but vaporized gas accumulates in the liquid feeding piping when liquid is not fed.

Since the vaporized gas is vigorously blown onto the cooled part together with the liquid refrigerant during liquid feeding, the temperature distribution of the cooled part is temporarily but significantly disturbed, which adversely affects the original measurement of the cooled part.

Therefore, one aspect of the present invention is that even when a refrigerant such as liquid nitrogen is intermittently taken out through a take-out mechanism and supplied to the part to be cooled, only the liquid refrigerant is supplied to the part to be cooled, and the gas generated by vaporization of the refrigerant is It is an object of the present invention to provide a refrigerant supply device that can prevent refrigerant from being vigorously blown onto a cooled part.

(Means for Solving the Problems) The present invention provides a refrigerant supply system that includes a sealable storage container that stores a refrigerant such as liquid nitrogen, and an extraction mechanism that increases the pressure inside the storage container and takes out the refrigerant to the outside. In the apparatus, an adiabatic fractionator having a gas outlet at the top and a liquid outlet at the bottom is provided at the outlet of the take-out mechanism.

(Operation) When the refrigerant is intermittently taken out by the take-out mechanism, a mixture of liquid refrigerant and gas generated by vaporizing the refrigerant is taken out at the take-out port of the take-out mechanism. A liquid refrigerant and its vaporized gas are supplied to the fractionator as a mixture.
Since the liquid refrigerant is heavier than the vaporized gas, it flows to the bottom of the fractionator and blocks the liquid outlet, and the vaporized gas is discharged from the upper gas outlet, so the vaporized gas pressure sent at high pressure is discharged here. It is opened by the outlet, and only liquid refrigerant is supplied to the part to be cooled in an unpressurized state.

(Example) FIG. 1 is a schematic cross-sectional view showing one example, and FIG. 2 is a cross-sectional view showing a fractionator in the same example.

1 is a storage container for storing a refrigerant such as liquid nitrogen, and is an insulated container such as a dewar bottle. The opening of the storage container 2 is sealed with a seal plug 4. A double pipe is inserted into the storage container 2 by penetrating the seal plug 4 and having an extraction pipe 6 for the extraction mechanism on the inside and an outer pipe connected to the leak pipe 8 on the outside, and the tip of the extraction pipe 6 is connected to the storage container. The outer tube reaches the lower part of the storage container 2 and is connected to the upper space of the storage container 2. The leak pipe 8 is closed when taking out the refrigerant.

A fractionator 12 is provided at the tip of the liquid sending tube 10 connected to the extraction tube 6.The fractionator 12 has a gas outlet 16 at the top of the fractionator body 14, as shown in FIG. A liquid outlet 18 is provided at the bottom.

The fractionator main body 14 has a substantially spherical upper portion and a funnel-shaped lower portion.

The area around the fractionator body 14 is covered with a heat insulating material 20, and the area around the liquid feeding tube 10 is also covered with a heat insulating material 22.

A tube 28 that guides the refrigerant from the liquid outlet 18 of the fractionator main body 14 to the cooled section 26 is also covered with a heat insulating material 24 .

In FIG. 1, the cooled part 26 is provided with samples and detectors of other measuring devices, and is provided with a liquid level sensor 3o to detect the liquid level of the supplied refrigerant.

Inside the storage container 2, at the tip of the take-out tube 6 inside the container.

A heater 34 is provided to vaporize the refrigerant and increase the pressure within the storage container 2 to take out the refrigerant.

32 is a controller which takes in a liquid level signal from the liquid level sensor 30 of the cooled part through a line 36;
Current is intermittently applied to the heater 34 through the line 38 so that the liquid level remains constant.

Next, we will explain the operation of this embodiment. 6 When electric current is applied to the heater 34 with the nok vibrator 8 closed, a part of the refrigerant is vaporized in the storage container 2 by the heater 34 and the refrigerant is inside the storage container 12. The pressure of the refrigerant increases, and the refrigerant is taken out from the extraction pipe 6 through the liquid feeding tube 10. The refrigerant is in the fractionator 12
It is supplied to the cooled section 26 through the. When the liquid level of the refrigerant in the cooled part 26 reaches a predetermined level, the power supply to the heater 34 is stopped via the controller 32 in response to the liquid level signal from the liquid level sensor 30, and the supply of the refrigerant is stopped. will be stopped.

After that, when the amount of refrigerant in the cooled part 26 decreases,
The heater 34 is energized again via the controller 32 in response to the liquid level signal from the liquid level sensor 30, and refrigerant is supplied. At this time, vaporized gas of the refrigerant is generated in the liquid feeding tube 1o due to the interruption of the supply of the refrigerant, and a mixture of the refrigerant and its vaporized gas is supplied from the liquid feeding tube 10 to the fractionator 12. In the fractionator main body 14, the vaporized gas is discharged from the gas outlet 16, and only the liquid refrigerant is supplied from the liquid outlet 18 to the cooled portion 26.

Although FIG. 2 shows an example of a fractionator body 14 having a funnel-shaped lower part and a spherical upper part, the shape and size of the fractionator body 14 can be modified into various shapes.

(Effects of the Invention) In the present invention, a fractionator is provided between a refrigerant extraction mechanism such as liquid nitrogen and a cooled part to which the refrigerant is supplied, and the vaporized gas discharged together with the liquid refrigerant is collected in the fractionator. Since the liquid refrigerant is removed from the gas outlet, it is possible to prevent the liquid refrigerant pressurized by the vaporized gas from being vigorously blown onto the part to be cooled.

It becomes possible to perform stable measurements of the sample and detector in the cooled part.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view showing one embodiment, and FIG. 2 is a sectional view showing a fractionator of the same embodiment. 2...Storage container, 4...Tight stopper, 6.0
90. , extraction tube, 10...liquid feeding tube, 1
2... Fractionator, 14... Fractionator body,
16... Gas outlet, 181.1.1. Liquid outlet, 20, 22, 24... Insulation material, 26.
- Cooled part. 30...Liquid level sensor. Controller, 34... Heater.

Claims (1)

[Claims] (1) A sealable storage container that stores a refrigerant such as liquid nitrogen, an extraction mechanism that increases the pressure inside this storage container and takes out the refrigerant to the outside, and a gas discharge port provided at the extraction opening of this extraction mechanism. A refrigerant supply device equipped with a heat-insulated fractionator and a liquid outlet at the bottom.