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    Precautions for use of refrigeration compressor overload protector

    Precautions for use of refrigeration compressor overload protector The overload protector of the compressor for air-conditioning generally adopts a sudden bimetal protector, which is composed of a heating wire, a bimetal and two static contacts, which are connected in series in the compressor circuit. When the current in the circuit is too large, the heating wire is hot and the dish-shaped bimetallic sheet is baked. When the bimetallic sheet heats up, it will arch in the opposite direction, thereby disconnecting the contacts; when the temperature of the compressor casing or motor is too high At this time, even if the working current is normal and the heating wire generates little heat, the bimetallic sheet will deform and bend upwards, detaching from the two static contacts and cutting off the circuit. This protector can automatically reset and has the dual protection function of over current and over temperature rise. According to the different installation methods, it can be divided into external and internal types. 1 External protector Installed on the sealed terminal of the compressor casing, close to the cover to sense the temperature of the compressor casing. Since there is a process of conduction and convection from the heating of the motor to the heating of the housing, there is also a process from the heating of the housing to the action of the protector. Therefore, the accuracy and reliability of this protection method are relatively poor, but because of its simple manufacture , The same bimetallic sheet, by adjusting the height of the screw, can make different protectors, and easy installation and maintenance, low cost, so it is generally used in low-power household air-conditioning compressors. 2 Set protector It is divided into binding type and plug-in type. The binding type is to bind the protector with the motor coil, which directly senses the temperature change of the coil, and the response is faster and accurate; the plug-in type is to insert the protector on the sealed terminal, The temperature of the motor is induced by the heat conduction of the refrigerant, and the protection is more accurate when the refrigerant does not leak, but once the refrigerant leaks, the protection performance is poor. In short, the built-in protector is more sensitive, more accurate, more reliable, more reliable and more applicable to the motor temperature sensing than the external type (general air-conditioning compressors can be applied). However, because it is installed inside the compressor, it requires a small size and can adapt to the harsh environment such as high temperature and high pressure changes inside the compressor. It has high requirements for its design and manufacturing, and the cost is several times more expensive than the external type. Precautions: 1. The configuration of the compressor overload protector is different, and the protection of the compressor is different. The built-in protector has higher sensitivity than the external protector and has a greater protection effect on the compressor. 2. When the refrigerant is insufficient, whether the built-in protector or the external protector protects the compressor is very limited, so the air-conditioning system needs to increase protection against refrigerant shortage. 3. The overload protector cannot play a protective role when there is too much refrigerant, and high-voltage switches and other high-voltage protection measures should be used in the system to avoid damage to the compressor caused by excessive refrigerant. 4. Under the condition of high compression ratio, the overload protector cannot play a protective role, and another low-voltage protection measure must be set up to protect the compressor.

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