SU859748A1 - Apparatus for transfering cryogenic liquids - Google Patents

Description

(54) DEVICE FOR CRYOGENIC OVERFLOW

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The invention relates to cryogenic engineering and can be used in the dispensing systems of cryostats, cryopumps chambers and in a number of other devices operating with cryogenic liquids.

A device for overflowing cryogenic liquids is known, consisting of an overflow pipe connecting an empty vessel and a receptacle, and the lower end of the overflow pipe is made of a material having a piezoelectric effect, equipped with electrodes connected to an AC source, and a lower inlet and upper outlet valves 1.

However, the presence of a heater does not allow the use of a device for overflow of aggressive and flammable cryogenic liquids, as there is a danger of destruction of the heater material, as well as the ignition of the liquid.

Closest to the present invention is a device for the overflow of cryogenic liquids, comprising an overflow pipe and an overflow steam line connecting the emptying vessel and the receiving vessel KOCTbti. LIQUIDS

However, this device also requires an additional pressure source for the overflow of fluid, which reduces its reliability.

The purpose of the invention is to increase the reliability of the device during overflow of aggressive and flammable cryogenic liquids.

The goal is achieved by the fact that the bypass steam pipe is equipped with a chamber installed inside it with radial windows and with a spring-loaded distribution valve placed in it with a cylindrical groove corresponding to the chamber windows and a partition placed opposite the chamber windows, while the upper and lower parts of the chamber are connected to the atmosphere. Roy.

The proposed device allows the possibility of blocking the gas cavities of the vessel and the receiving tank when the valve is moved, and when the upper extreme position is reached, the gas cavity of the receiving tank is connected to the atmosphere.

The drawing shows the proposed device, a General view.

The device consists of an overflow pipe 1, a coaxially located inside bypass steam pipe 2 connecting the gas cavities of an empty vessel 11 of the receiving tank (not shown). Chamber 3 has a built-in chamber 3 with a distribution valve 4 placed in it, at one end of which a cylindrical groove 5 is made. The steam line is divided by a partition 6, and windows 3 are made in such a way that the groove 5 serves as a bypass channel for the gas flowing through the steam line 2 . A spring 8 is installed in the cavity of chamber 3, isolated from the cavity of the steam line by a valve 4 and communicating through channels 7 with the atmosphere. The entire device is insulated with a vacuum jacket 10.

The device works as follows.

The ends of the overflow pipe 1 are lowered into the cryogenic liquid of the emptying vessel and the receiving tank, and the corresponding ends of the steam line 2 are tightly connected to the gas spaces of the vessel and the vessel. As a rule, evaporation of a cryogenic liquid in a receiving vessel (for example, in a cryostat) is more intense than in a vessel (for example, in a Dewar vessel). Evaporating in the receiving tank, the gas through the steam line 2 enters the vessel, thereby increasing the pressure in their gas spaces simultaneously. The spring 8, calculated on a definite; 1 pressure, keeps the valve 4 and in the lowest position. When the calculated pressure in the cavity of the steam line 2 is exceeded, clanan 4 moves upwards.

shutting off the steam line and opening the channels 9, thereby releasing the pressure from the receiving tank. Due to the resulting pressure drop, the cryogenic liquid from the vessel is squeezed into the receiving tank during the return stroke of the distribution valve 4. The longer the distribution valve, the longer the compression time. The valve 4 is returned to its original position by the spring 8, after which the cycle repeats.

The proposed device eliminates the use of a heater, which increases its reliability, allows its use for the transfer of aggressive and flammable cryogenic liquids, and also reduces energy consumption.

Claims (2)

Invention Formula A device for the overflow of cryogenic liquids containing an overflow pipe and an overflow steam pipe connecting the empty vessel and a receptacle, characterized in that, in order to increase reliability, the overflow steam pipe it is equipped with a chamber installed inside it with windows and a spring-loaded valve with a groove corresponding to the chamber windows and a partition placed opposite the chamber windows, with the upper and lower chambers connected to the atmosphere. Sources of information taken into account in the examination 1. USSR author's certificate 652405, cl. F 17 C 9/00, 1978. 2. USSR author's certificate No. 634068, cl. F 17 C 3/00, 1977. To receive reception