SU700756A1 - Microrefrigerator - Google Patents

Description

one

 The invention relates to a cryogenic technique, in particular to microcryogenic systems for deep cooling of radiant energy receivers.

Micro-refrigerators are known that contain a heat exchanger wound on a sleeve with an inlet fitting and a throttle, equipped with an ooskhod control

one.

In these micro-refrigerators, the flow controllers have a complex structure, reducing the reliability of the micro-refrigerator.

More simple and reliable is a well-known microcooler containing a heat exchanger wound on a sleeve with an inlet fitting and a throttle equipped with a flow regulator, made in the form of a regulator with sequentially placed elastic elements and a gland screw, the elastic element being - laid on the side of the throttle is made of a material with anomalous temperature dependence of the rigidity 2.

In the known micro-refrigerator, it is not possible to ensure sufficiently effective flow control during

in the sem-range of the working pressure of the balloon micro-cryogenic system. For example, for a long-life balloon system with a working pressure range of 300-100 bar, it is not possible to adjust the regulator to work economically in this range, basically the regulator operates in the thermo-valve mode, which causes significant refrigerant losses. In addition, there are difficulties in adjusting the controller, since access to the gland screw requires disconnecting the case from the object to be cooled and the micro-refrigerator.

The aim of the invention is to expand the range of control of the coolant flow rate and ensure the processability of adjustment of the regulator.

Claims (2)

This is achieved by the fact that the microcooler additionally contains a sleeve of thermally conductive material and a regulator travel stop mounted on the thread in the gland screw, i- and the sleeve is located along the periphery of the regulator between the throttle and the coal element of material with anomalous temperature dependence of stiffness, and the regulator the flow is placed in the sleeve and its gland screw is located on the side of the inlet fitting of the heat exchanger. The drawing shows a microholync without a heat insulating body, general view. The microcooler contains a heat exchanger 2 wound on the liner 1 with an inlet fitting 3 and a throttle 4, equipped with a flow regulator made in the form of a regulator 5 with successively placed two elastic elements b and 7 and a gland screw 8. An elastic element b located on the side of the throttles 4, is made of a material with an abnormal temperature dependence L |: resistance The microcooler also contains a plug 9 of thermally conductive material placed along the periphery of the regulating body 5 between the throttle 4 and its element 6 material with anomalous temperature dependence of rigidity. The gland screw 8 has a thread 10 installed by the regulator 5. The flow regulator is located in the sleeve 1 and its pressure screw 8 is located on the side of the inlet fitting 3 of the heat exchanger 2. A preload of elastic elements is projected at the gland screw 8 b and 7 regulators. By moving the limiter 10 of the stroke in the screw 8, an independent adjustment of the elastic element b with the anomalous characteristic of hardness is carried out. In the warm state of the microcooler, the regulating body 5 occupies such a position relative to the throttles 4, which provides, for the given areas of the nozzle and the required flow rate of refrigerant, for the device to quickly enter the operating mode. After the temperature in the area of the cooling object reaches a predetermined value, the elastic element 6 is also cooled, primarily by transferring heat through the sleeve 9, to the temperature of the open-hearth transformation of the material of the elastic element b. In this case, the rigidly elastic element b is sharply reduced and it is compressed under the action of the elastic one. element 7. The regulatory authority 5 blocks the throttle from the version and thereby reduces the flow of refrigerant. When the temperature rises to a certain level, the elastic element b restores the stiffness and depresses element 7 and moves the regulating body 5, opening a throttle hole, which again causes a decrease in temperature in the area of element 6. Due to the location of the thermosensitive elastic element not in the liquid coolant bath, and in the zone of varying temperature of the heat exchanger, an effective regulation process is achieved. The use of this micr. Cooler ensures the regulation of the refrigerant flow throughout the entire range of working pressures, which greatly increases the efficiency of the micro-dispenser. . Due to the positioning of the regulator of the inside of the heat exchanger liner, the design is highly compact. The arrangement of the thermosensitive elastic element in the zone of changing social temperature f in the heat exchanger makes it possible to realize the sensitivity of the regulator most fully and achieve a significant decrease in the value of the final pressure. Placing the adjusting elements on the heat end of the heat exchanger ensures adaptability of the adjustment, since access to the regulating organs is facilitated, and the micro-fridge and the housing do not need to be disconnected, which allows the regulator to be adjusted without shutting off the refrigerant supply. As a result, the adjustment cycle of the regulator body of the microcooler under production conditions is shortened. Claims of the invention A microcooler containing a heat exchanger wound on a sleeve with an inlet ELM choke and throttle equipped with a flow regulator made in the form of a regulator with successively placed two elastic elements and a gland screw; temperature dependence of stiffness, characterized in that, in order to expand the range of flow control of the refrigerant and ensure the processability of adjustment, it additionally contains a sleeve of thermally conductive material and a regulator travel stop mounted on the thread in the gland screw, and the sleeve is placed along the periphery of the regulator between the throttle and an elastic element made of a material with an anomalous: temperature dependence of stiffness, with the flow regulator placed in the sleeve and its gland screw Ozhen from the input; heat exchanger nozzles. Sources of information, taken into account in the examination 1. Greziv AK and Zinoviev B.C. Microcryogenic technology. M., Mechanical Engineering, 1977, -C. 58-74. 2. USSR author's certificate number 533802, cl. F 25 B 9/02, 1974. 3 f II ) S) J, .J, .... J.,:, J ,, ....:., .. ,,,,,,,, ± J ,, / Y / Y A K 11; ; 4; s; ; j auuu y y w :; ;: / W /. | L ff mfk LL Y y n, W %%%% M / Ш Ш / Ш rtftfyyi gyl I V lJJ}} J f7}} fffffJfjrrff Hff} f fff} f} f} J i}} frf f}} iJffftf} J V ff f Lf 7 th Ll ze