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Supermarket refrigerated showcase refrigeration system discharge (four)
supermarket refrigerated showcase refrigeration system discharge (four)
oil discharge operation, in the design of ammonia refrigeration system, oil separator, accumulator, evaporator, condenser, intercooler , Low-pressure circulation barrel, ammonia liquid separator, etc., all have oil drain pipes connected with the oil inlet of the oil collector. When draining the ammonia oil separator, the steps are as follows.
(l) stop supermarket refrigerated showcase Ammonia oil separator works, due to the low relative density of ammonia liquid, oil and ammonia liquid separate and sink.
(2) Open the return valve, reduce the pressure of the oil collector, and close the return valve when it is close to the suction pressure.
(3) Open the oil separator oil drain valve and the oil collector oil inlet valve. Due to the pressure difference, the oil and a small part of the ammonia in the ammonia oil separator enters the oil collector, waiting for the oil to be discharged to the oil collector container 80% When, close the drain valve of the oil separator and the intake valve of the oil collector. The ammonia in the oil evaporates, and the ammonia gas is drawn away by the suction pipe of the refrigerator along the return valve.
(4) Slightly open the air return valve to evaporate the ammonia in the oil, and the ammonia gas is drawn away by the suction pipe of the refrigerator along the air return valve. When the pressure of the oil collector drops to the suction pressure, close the gas return valve to see if the pressure of the oil collector rises. If it rises, open the gas return valve. If it does not rise, open the drain valve to drain the oil. After draining the oil, close the drain valve to keep the oil collector in working condition. This draining method is carried out at low pressure, so it is relatively safe. When other auxiliary equipment needs to be drained, the procedure is the same as above. The fluorine refrigeration system has no oil drain equipment because fluorine and oil are mutually soluble.
4. Precautions for oil drain operation
(1) When draining low-pressure equipment such as evaporators, be sure to stop their work, and let the supermarket refrigerated showcase stand for 20 minutes to 30 minutes or longer until the evaporation pressure rises greater than the oil collection The oil can only be put into the oil collector when the pressure of the collector.
(2) High-pressure equipment is generally not allowed to drain oil on site, and must be drained through an oil collector, otherwise it is unsafe.
(3) Before draining the oil, the oil collector must remain empty.
(4) After the lubricating oil is released, if you continue to use it, it must be tested and filtered before it can be injected into the equipment.
(5) When draining the oil, if there is a blockage, it is strictly forbidden to pour the oil collector with boiling water to prevent explosion.
(6) In the process of draining and pumping ammonia, the oil level can be judged from the frosting position of the oil collector. At the same time, be careful not to bring ammonia into the refrigerator cylinder.
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