Compressor safety protection method for four industrial chillers

PubDate:2017-10-21Author:Jinlun CompanySources:Mingdi heat pumpViews:714

First, prevent liquid shock

Under normal working conditions, the industrial chiller refrigeration compressor should draw in the dry steam of the refrigerant. If the refrigerant flow rate is large, the heat load changes too fast, improper operation may inhale the wet steam, or the liquid working medium, if the liquid enters Too much, too late to discharge from the exhaust valve, the liquid hammer formed by the high pressure will cause damage to the cylinder, valve, piston, connecting rod and other parts. Chongqing Refrigeration Equipment Co., Ltd. suggests that the protective measures that can be taken 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; to install the oil heater, to add the lubricating oil before the compressor starts, Lowering the amount of refrigerant dissolved in the lubricating oil; or pressing the valve assembly with a spring at the end of the cylinder to form a false cover.

Second, pressure protection

1. Control of suction and exhaust pressure: If the exhaust pressure exceeds the given value, the high pressure control part cuts off the compressor power supply, the compressor stops; the suction pressure is lower than the given value, and the low pressure control part cuts off the compressor power supply and stops 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 arranged on the pipeline between the exhaust chamber of the compressor of the chiller and the suction chamber.

3. Safety film: The safety diaphragm is installed between the suction and exhaust chambers. When the pressure difference between the suction and exhaust exceeds the specified value, the diaphragm is broken and the exhaust pressure is reduced. (The filter should 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 of the lubricating oil differential pressure controller respectively. When the pressure difference between the hydraulic pump outlet and the inlet is too high or too high When low, the controller will cut off the compressor power supply and the motor will stop running to protect the compressor.

Third, the protection of the built-in motor

In order to further ensure that the motor is not hot, in addition to proper use and attention to maintenance, Chongqing Refrigeration Equipment Co., Ltd. suggests that it can install overheating relays; if the three-phase motor is out of phase, the motor will not start or overload, and overload relays can be used to avoid motor shortage. Phase damage.

Fourth, temperature protection

The exhaust temperature protection method is mainly to place the temperature controller close to the exhaust port, and when the exhaust gas temperature is too high, the temperature controller operates to cut off the circuit; causing the housing temperature of the unit to be too high is mainly due to the heat exchange of the condenser. Insufficient capacity, Xiao Bian recommends checking the air volume or water volume of the condenser, whether the water temperature is suitable, or mixing air or other non-condensable gas in the refrigeration system, etc., which needs to be carefully observed and detected.