Several safety protection methods for compressors in industrial chillers

Several safety protection methods for compressors in industrial chillers In industrial chillers, the quality of the compressor determines whether the working efficiency of the chiller is good. At the same time, the compressor also plays an important role in the future after-sales maintenance of the chiller. Once a failure occurs, it will improve the maintenance of the chiller. The cost of the machine increases. In order to reduce the maintenance cost of the chiller, the editor recommends the following 4 methods to protect the chiller compressor. 1. Prevent liquid hammer Under normal working conditions, industrial chiller refrigeration compressors should inhale the dry vapor of the refrigerant. If the refrigerant flow is large, the heat load changes too fast, or the operation is improper, the wet vapor may be sucked, or the liquid refrigerant, if the liquid enters Too much, too late to discharge from the exhaust valve, and the liquid impact caused by high pressure will cause damage to the cylinder, valve, piston, connecting rod and other parts. The protection measures recommended by Chongqing Refrigeration Equipment Co. are to install a gas-liquid separator to separate the liquid entrained in the low-pressure steam to ensure the dry stroke of the compressor; install an oil heater and add lubricating oil before the compressor starts Reduce the amount of refrigerant dissolved in the lubricating oil; or press the valve assembly with a spring against the end of the cylinder to form a false cover; Second, pressure protection 1. Control of suction and discharge pressure: if the discharge pressure exceeds a given value, the high-pressure control section cuts off the compressor power supply and the compressor shuts down; when the suction pressure is lower than the given value, the low-pressure control section cuts off the compressor power supply to stop it And issue an alarm signal. 2. Safety valve: In order to prevent refrigerant from leaking to the atmosphere, a closed safety valve is generally used. The safety valve is installed on the pipeline between the exhaust chamber and the suction chamber of the chiller compressor. 3. Safety diaphragm: The safety diaphragm is installed between the suction and exhaust chambers. When the difference between the suction and exhaust pressure exceeds the specified value, the diaphragm ruptures and the exhaust pressure decreases (a filter screen needs to be installed on the side of the suction chamber to prevent breakage The diaphragm falls into the suction chamber). 4. Lubricating oil pressure difference controller: connect the hydraulic pump inlet and the hydraulic pump outlet to the low-pressure inlet and high-pressure outlet on the lubricating oil pressure difference controller. When it is low, the controller will cut off the power of the compressor and the motor will stop running to protect the compressor. III. Protection of built-in motor In order to further ensure that the motor is not overheated, in addition to correct use and attention to maintenance, Chongqing Refrigeration Equipment Company recommends that overheating relays can be installed; if the common three-phase motor lacks phase, it will cause the motor to fail to start or overload. The overload relay can be used to avoid the motor from lack Phase damage. Fourth, temperature protection The exhaust temperature protection method is mainly to place the thermostat close to the exhaust port. When the exhaust temperature is too high, the thermostat will cut off the circuit; the shell temperature of the unit is too high mainly due to the heat exchange of the condenser Inadequate capacity, the editor recommends checking the air volume or water volume of the condenser, whether the water temperature is appropriate, or the air or other non-condensable gas mixed in the refrigeration system, etc., need to be carefully observed and tested

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