Safety protection method of chiller compressor ★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 after-sales maintenance of the chiller. Once a failure occurs, it will improve the company's maintenance of the chiller. Increase in costs. In order to reduce the maintenance cost of the chiller, we recommend the following 4 methods to protect the compressor of the chiller.
One, prevent liquid shock Under normal working conditions, the refrigeration compressor of an industrial chiller should inhale the dry vapor of the refrigerant. If the refrigerant flow is large, the heat load changes too quickly, or the operation is improper, it may inhale wet vapor or liquid refrigerant. 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 recommended protective measure is to install a gas-liquid separator to separate the liquid entrained in the low-pressure vapor to ensure the dry stroke of the compressor; install an oil heater to add lubricating oil before the compressor starts to reduce the dissolution in the lubrication The amount of refrigerant in the oil; or press the air valve assembly on the end of the cylinder with a spring to form a false cover; 2. 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 power supply of the compressor and the compressor stops; the suction pressure is lower than the given value, the low-pressure control section cuts off the power supply of the compressor to stop it And issue an alarm signal. 2. Safety valve: In order to prevent the refrigerant from leaking to the atmosphere, a closed safety valve is generally used, and the safety valve is set on the pipeline between the discharge cavity and the suction cavity of the compressor of the chiller 3. Safety membrane: The safety membrane is installed between the suction and exhaust chambers. When the pressure difference between the suction and exhaust exceeds the specified value, the diaphragm ruptures and the exhaust pressure decreases (a filter must be installed on the side of the suction chamber to prevent breakage. The diaphragm falls into the suction cavity). 4. Lubricating oil pressure difference controller: connect the inlet and outlet of the hydraulic pump to the low pressure inlet and high pressure outlet of the lubricating oil pressure difference controller. When the pressure difference between the outlet and inlet of the hydraulic pump is too high or too high When it is low, the controller will cut off the compressor power and the motor will stop running to protect the compressor. Three, the protection of the built-in motor In order to further ensure that the motor is overheated, in addition to correct use and attention to maintenance, Xingde recommends that you install an overheating relay; if the commonly used three-phase motor lacks phase, the motor cannot be started or overloaded. An overload relay can be used to avoid damage to the motor due to lack of phase. . Fourth, temperature protection The exhaust temperature protection method is mainly to place the thermostat close to the exhaust port. When the exhaust temperature is sensed, the thermostat cuts off the circuit; the casing temperature of the unit is too high, mainly due to the heat exchange of the condenser If the capacity is insufficient, Xingde recommends checking whether the air volume, water volume, and water temperature of the condenser are appropriate, or whether air or other non-condensable gases are mixed in the refrigeration system, etc., which requires careful observation and testing.
