Four types of safety protection measures shared by compressors
As the most important part of the chiller, the compressor occupies an important position in the after-sale maintenance of the chiller. Moreover, the cost of maintenance of chiller compressors is relatively high. In order to reduce the cost of chiller maintenance, Nagin Machinery protects chiller compressors from the following four aspects. In order to achieve the purpose of reducing the cost of chiller maintenance. First, prevent liquid strikes Under normal working conditions, industrial chiller refrigeration compressors should draw in dry refrigerant vapors from the refrigerant. If the refrigerant fluids have large flow rates, the heat load changes too quickly, and improper operation may inhale wet steam, or liquid working fluids, and even more If lubricating oil enters the cylinder, if there is too much liquid entering, it is too late to be discharged from the exhaust valve, and the pressure in the cylinder will rise sharply to form a liquid hammer, which is the damage of parts such as cylinders, valves, pistons, and connecting rods. Therefore, various protective measures can be taken, such as installing a gas-liquid separator to separate the liquid entrained in the low-pressure vapor to ensure the dry stroke of the compressor; installing an oil heater and adding the lubricant to the lubricant before starting the compressor. The amount of refrigerant in the lubricant; or the valve assembly is pressed against the end of the cylinder with a spring to form a false cover; Second, pressure protection 1, suction and exhaust pressure control: that is, we often say that the high and low pressure controller, by the high pressure control part and the low pressure control part. If the discharge pressure exceeds the given value, the high pressure control section cuts off the compressor power supply and the compressor stops; the suction pressure is lower than the given value, and the low pressure control section cuts off the compressor power supply to stop it and sends 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 disposed on the pipeline between the compressor chamber and the suction chamber of the chiller compressor. 3. Safety membrane: The safety membrane is installed between the suction and exhaust chambers. When the suction and exhaust pressure difference exceeds the specified value, the diaphragm ruptures and the discharge pressure decreases (the filter must be installed on the side of the suction chamber to prevent crushing. The diaphragm falls into the suction chamber). 4. Lubricating oil pressure difference controller: connect the inlet of the hydraulic pump and the outlet of the hydraulic pump respectively with the low pressure inlet and high pressure outlet on the oil pressure difference controller, and the pressure difference between the outlet and the inlet of the hydraulic pump is too high or too high. When it is low, the controller will shut off the compressor power supply, stop the motor and protect the compressor. Third, the built-in motor protection Overheat protection, in order to further ensure that the motor is not too hot, in addition to proper use, pay attention to maintenance, but also the installation of overheating relays; there is a lack of phase protection, commonly used three-phase motor phase loss will lead to the motor can not start or overload, can be overloaded Relays avoid motor damage due to missing phases; Fourth, temperature protection The temperature here refers to the exhaust temperature and the temperature of the industrial chiller housing. Exhaust temperature protection method is mainly to place the thermostat near the exhaust port. If the exhaust temperature is too high, the thermostat will cut off the circuit; the high temperature of the unit's shell will affect the life of the compressor. Due to the lack of condenser heat exchange capacity, it is necessary to check the condenser's air flow or water, water temperature is appropriate. Also, check whether the air in the refrigeration system is mixed with air or other non-condensable gases, or if the suction temperature is too high, observe and inspect.