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The parking function of supermarket refrigerated showcase (2)
author: supermarket refrigerated showcase category: walk-in display coolers Views: 513Time: 2016-08-22
supermarket refrigerated showcase The parking function of refrigeration equipment (2)
accident parking
accident parking accident parking is a supermarket refrigerated showcase refrigeration equipment is in the process of malfunctioning or due to an unexpected external environment When the impact will pose a serious threat to the refrigeration system, the emergency measures taken may sometimes require an emergency stop, and sometimes need to be stopped. In short, corresponding measures must be taken according to the situation and the degree of harm. When dealing with an emergency stop, you should be calm and swift. Avoid turning off control valves or electrical switches indiscriminately due to panic. Beware of the expansion of the accident.
(1) In the following situations, emergency stop processing should be carried out (that is, not according to the normal stopping procedure).
①The power supply is stopped suddenly. The throttle valve of the regulating station should be closed immediately and the liquid supply to the evaporator should be stopped to avoid wet compression due to excessive liquid in the evaporator next time it is started, and then close the suction and exhaust valves of the refrigerator. If the fluorine system has a solenoid valve, it is not necessary to deal with it, just pull down the power switch. Check the cause of the stop, and restart after confirming that the accident is eliminated.
②Suddenly stop water and stop. When the cooling water is suddenly interrupted due to pipeline maintenance or other reasons, the power supply should be cut off immediately, and the operation of the refrigerator should be stopped to avoid excessive increase of the condensing pressure. Then close the expansion valve and the suction valve of the refrigerator (the power supply should also be cut off for the water-cooled fluorine refrigerator). After the cause is identified and eliminated, it can be restarted. If the safety valve of the supermarket refrigerated showcase system or equipment is over-pressured due to water failure, the safety valve should be tested once.
③Stop in case of fire. When a fire occurs in a building adjacent to the refrigeration station and the safety of the refrigeration system is endangered, the power supply should be cut off immediately, and the oil drain valves of the reservoir, oil separator, and evaporator should be opened quickly (in general design, these oil drain valves and The emergency ammonia discharge device is connected), and the emergency ammonia discharge device is turned on, so that the ammonia liquid of the system is concentrated in the emergency ammonia discharge port and discharged quickly to prevent an explosion accident in the refrigeration system due to the spread of fire.
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