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 company's maintenance of cold water. The cost of the machine increased. In order to reduce the maintenance cost of the chiller, the editor of okmarts.com recommends the following 4 methods to protect the compressor of the chiller.

　　 1. Prevent liquid shock

Under normal working conditions, the refrigeration compressor of industrial chillers 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 be discharged from the exhaust valve, the liquid hammer formed by the high pressure will cause damage to the cylinder, air valve, piston, connecting rod and other parts. The protective measure recommended by Chongqing Refrigeration Equipment Company 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 and add lubricating oil before the compressor starts. Reduce the amount of refrigerant dissolved in the lubricating oil; or use a spring to press the air valve assembly against the end of the cylinder to form a false cover;

　　 Two, pressure protection

1. Control of suction and discharge pressure: If the discharge pressure exceeds a given value, the high-pressure control part will cut off the compressor power supply and the compressor will stop; if the suction pressure is lower than the given value, the low-pressure control part will cut off the compressor power supply and stop the compressor , And send out an alarm signal.

　　2. Safety valve: In order to prevent the refrigerant from leaking to the atmosphere, a closed safety valve is generally used. The safety valve is set on the pipeline between the discharge cavity and the suction cavity of the compressor of the chiller.

3. Safety diaphragm: The safety diaphragm is installed between the suction and exhaust chambers. When the pressure difference between suction and exhaust exceeds the specified value, the diaphragm will rupture and the exhaust pressure will decrease (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, Chongqing Refrigeration Equipment Co., Ltd. recommends that you install an overheating relay; the lack of phase of a commonly used three-phase motor will cause the motor to fail to start or overload. An overload relay can be used to avoid the lack of a motor. Phase damage.

　　 Four, 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 case temperature of the unit is too high, mainly due to the heat exchange of the condenser If the capacity is insufficient, the editor recommends checking whether the air volume or 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.