Capillary anti-blocking structural assembly of low-temperature refrigerator and controlling method for assembly

Abstract

The invention discloses a capillary anti-blocking structural assembly of a low-temperature refrigerator and a controlling method for the assembly. The assembly comprises a compressor, an oil return pipe, an oil separator, a condensation fan, a condenser, a drying filter, an electric control board, a capillary and an evaporator. The assembly is characterized in that two ends of the capillary are connected with electric heaters or integrally covers the electric heaters; temperatures of the inlet and outlet parts of the capillary are controlled in an electric heating mode; according to the capillary oil blockage and ice blockage forming principle, for preventing the capillary from being blocked and preventing the working performance of a refrigerating system from being affected at the same time, the capillary part is generally heated in the running process of the refrigerating system and at the stop stage of the compressor; according to types of a refrigerant and lubricating oil adopted by the refrigerating system, the temperatures of the heated parts are controlled, so that blockage is prevented, and the working medium of the system is prevented from being deteriorated by excessive heating; and the refrigerating performance of the low-temperature refrigerator is prevented from being affected by excessive heating.

Description

technical field [0001] The invention relates to the technical field of refrigeration equipment, in particular to a capillary anti-blocking structural component of a low-temperature refrigerator and a control method thereof. Background technique [0002] Compressors currently used in refrigeration products usually need to add specific lubricating oil for lubrication needs. During the operation of the refrigeration system, there will always be a small amount of oil participating in the circulation of the refrigeration system. For low-temperature refrigerators, especially low-temperature refrigeration systems using multi-stage refrigeration cycles, the lubricating oil in the system is difficult to flow due to the decrease in temperature and the increase in viscosity. When the refrigeration system is running, when the compressor stops, the pressure difference between the two ends of the capillary gradually disappears, the refrigerant flow in the system stops, and the function o...

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Problems solved by technology

[0006] In addition, when solving and repairing refrigerator refrigeration system failures caused by oil blockage and ice blockage, it is also possible to use passive means such as system pipeline vibration, refrigerant pulsation impact, and heating at the entrance of the capillary tube to repair the method, as disclosed in Chinese patent 201110345852.0 A pulse heating anti-clogging refrigerator, which discloses that an electric heater is set on the connection end of the capillary tube and the dry filter, and when the capillary tube is blocked, organic impurities such as oil stains are heated by high temperature and then pulsed by the compressor The work of this type blows out the impurities and eliminates the blockage. Although this method can solve the problem of capillary blockage, it is a treatment method after the capillary blockage occurs, and it does not fundamentally prevent the occurrence of the blockage problem. The temperature of the electric heater is not controlled during the process, which may cause damage to the refrigeration performance of the refrigeration equipment or the refrigeration equipment (such as causing deterioration of lubricating oil, etc.)

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