SU817370A1 - Apparatus for delivering cooling agent - Google Patents

Description

(54) APPROACH FOR COOTING THE REFRIGERANT

I

The invention relates to a cryogenic technique, namely to refrigerant supply systems of various cryogenic plants, for example, cryostats or software freezers.

A device for dispensing a refrigerant is known, in which the heater is freely floating and placed on a refrigerant supply pipe consisting of insulated parts, on the surface of which current-collecting parts 1 are installed.

The disadvantage of this device is that it is necessary to manufacture special collector devices, the installation of which complicates the design and reduces the rigidity.

It is also known a device that provides storage and dispensing of a refrigerant during the creation of an overpressure in the storage vessel, which contains a heat-insulated container, a heat-insulated tube, the upper part of which is made with openings, partly inserted into the container and tightly connected with

I, end mounted heater

tube and safety valve lowered into the container 2.

A disadvantage of the known device is the duration of the process of increasing the pressure in the vessel due to the fact that a considerable part of the power of the heater, necessary for the vaporization of the refrigerant, is spent on heating the entire mass of liquid. It is possible to reduce the time of preparing the system for operation only by increasing the power of the heater, which leads to unnecessary energy consumption, as well. in some cases, to an additional discharge of the vapor of the crystalline liquid into the environment with a residual increase in pressure in the tank after the consumer is disconnected.

Claims (3)

Closest to the present invention is a device for refrigerant containing a container and an overflow pipe placed in it with a shut-off valve and an evaporator designed as a vertical tube, in the lower part of which a heating element is installed. When the heating element is on, the refrigerant enclosed inside the tube is heated and continuously ejected as a vapor-liquid mixture through the upper end of the tube into the vapor zone, i.e. The device works on the principle of heat pump. The presence of thermal insulation on the heater prevents the dissipation of thermal energy throughout the mass of the refrigerant and its entire power is spent only on heating the tube and the small part of the refrigerant that is in it {3}. The disadvantage of the known device is the fact that it does not provide rapid vaporization of the refrigerant, since its release from the evaporator occurs as a vapor-liquid mixture, and the percentage of steam is relatively small. In this case, the energy of the heater is spent not only on vaporization, but also on the rise of liquid with its release through the upper end of the tube. Increasing the power of the heater leads to an increase in the rate of refrigerant vaporization and fluid release, and the percentage of steam increases slightly due to poor heat exchange due to the presence of a vapor gap between the liquid and the walls of the heated tube, as well as the limited length of the tube. The purpose of the invention is to increase the efficiency of work due to the intensification of the process of vaporization. The goal is achieved by the fact that the device is equipped with an additional evaporator. set above the main one. In addition, an additional evaporator is fixed in the upper end part of the tube and made in the form of a reflector with a heating element. Also, to ensure reliable operation, the heating elements of the main and additional evaporators are connected in parallel. In FIG. 1 shows the device, a general view; in fig. 2 - main and additional evaporator, section. The device contains a tank 1 with a refrigerant, an overflow pipe 2, an evaporator 3 with a heating element 4, an additional evaporator 5 with a heating element 6. The overflow pipe 2 is equipped with a shut-off valve 7. The device operates as follows; When the valve 7 is closed, heating elements 4 and 6 are turned on. With the help of heating element 4, refrigerant vaporization takes place and the vapor-liquid mixture rises through the evaporator into the vapor zone. When the flow of the vapor-liquid mixture falls on the additional evaporator S, evaporation of the refrigerant drops contained in it occurs. When the valve 7 is turned off, the refrigerant is subjected to overpressure through the overflow pipe 2 to the consumer. The proposed device allows, under other equal conditions (heating capacity, vessel volume and liquid level height), to increase vaporization, which, in turn, causes an accelerated increase in pressure in the vapor space of the vessel. This reduces the time required to prepare the system for operation by 2 times in comparison with the known device, which allows using the proposed device as a simple executive body in automation systems. Claim 1. A device for dispensing a refrigerant, containing a container and an overflow pipe placed in it with a shut-off valve and an evaporator made in the form of a vertical tube, in the lower part of which a heating element is installed, characterized in that, in order to increase work efficiency due to intensification the process of vaporization, the device is equipped with an additional evaporator installed above the main one. 2. The device according to claim 1, characterized in that the additional evaporator is designed as a reflector with a heating element and is fixed in the upper end part of the tube. 3. The device according to claim 2, in order to ensure reliable operation, the heating elements of the main and additional evaporators are connected in parallel. Sources of information taken into account in the examination 1. The author's certificate of the USSR N 429419, cl. G 05 D 23/30, 1972. 2. Authors certificate of the USSR N 250164, cl. F 17 C 3/08, 1967. 3. The patent of France N 2032036, cl. F 17 C 7/00, 1970. 1 -2 -J Fy