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    Compressor common knowledge, how much do you know

    Compressor common knowledge, how much do you know The compressor is the heart of the refrigeration system. It sucks low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it through the operation of the motor, and discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle , So as to realize the compression → condensation (exothermic) → expansion → evaporation (endothermic) refrigeration cycle. For the compressor, what are the common problems, let us take a look: 01 Why control the impurity content and moisture content of the compressor and air conditioning system? Impurities enter the friction surface of the moving parts of the compressor pump body, which can cause abnormal scratches and wear. Impurities entering the solenoid valve, expansion valve, control valve, capillary tube and shut-off valve in the freezer system can block the valve hole or make the valve closed tight And failed. The moisture of the compressor will mainly produce adverse effects in several aspects: The capillary tube and expansion valve will cause ice blockage, and the evaporator cooling tube will also freeze; The metal material is corroded, forming deposits; The valve core is corroded and the closure is not tight; "Copper plating" phenomenon occurs on the surface of compressor pump parts; Accelerate the deterioration of materials such as insulating materials, refrigerants, and refrigeration oil. 02 What is the function and principle of the compressor protector? The function of the compressor protector is mainly to protect the compressor from accidents such as motor burnout when the compressor is in an abnormal situation. The main principle is to rely on the internal heating wire of the protector and the internal resistance of the bimetallic sheet to cause the bimetallic sheet to act through the combined action of current heating and external conduction heat, thereby cutting off the circuit and protecting the compressor from damage. 03 Why should liquid refrigerant be prohibited from returning into the suction chamber of the compressor? If the liquid refrigerant directly enters the suction chamber of the compressor, during the rotation of the crankshaft, the compressor volume becomes smaller and smaller, and the pressure rises sharply, causing abnormal force or even damage to the pump body parts and valve plates. Liquid shock can also cause abnormal vibration and noise of the compressor. 04 Why shouldn't the air conditioning refrigerant recovery time be too long? The air-conditioning refrigerant recovery operation should not be too long. Because the refrigerant recovery time is too long, the temperature of the exhaust gas will be very high due to the extremely thin refrigerant gas sucked in, causing the temperature of the pump body parts of the compressor to rise rapidly. Excessively high temperature makes the expansion difference of each part too large, which causes the fitting gap of some parts to become smaller or even disappear, and eventually results in abnormal scratches or wear. 05 What is the effect of connecting the wrong compressor line? Why can't the protector protect? The wrong connection of the compressor will make it unable to work normally. According to different wiring error methods, there will be stalling, reverse rotation, and stop after starting, and it may cause the compressor motor to burn directly. Because the compressor protector is selected based on the compressor's correct wiring and the operating characteristics of the protector under abnormal operating conditions, it is impossible to ensure that the compressor is protected when it is connected to the wrong line. In the case of miswiring, it is difficult to protect the motor through the protector. 06 Why can the compressor be started again at least 3 minutes after the compressor is turned off? When the compressor starts, there will be more refrigerating machine oil entering the air conditioner system along with the refrigerant circulation. If there is not enough running time, the refrigerating machine oil will not be able to return to the compressor cavity in time, and frequent shutdowns will cause the internal of the compressor Low oil level can easily cause poor lubrication of mechanical moving parts of the compressor. In addition, the shutdown time of more than 3 minutes is mainly to give the system enough pressure balance time, otherwise the compressor will not start normally due to the presence of high and low pressure.

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    06/14/2020

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    How to prevent reversing of refrigeration compressor

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