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Analysis of automatic control of ammonia walk-in cooler refrigeration equipment (2)
author: supermarket refrigerated showcase category: commercial refrigeration Views: 511Time: 2016-08-22
Analysis of automatic control of ammonia walk-in cooler refrigeration equipment (2)
Low pressure accumulator liquid level adjustment control elements: solenoid valve 7, main valve 6 , Remote control level gauge 9.
(1) Principle of normal liquid level adjustment: When the liquid level drops to the lower limit, the remote control level gauge sends a signal to open the solenoid pilot valve and the main valve to supply liquid to the low-pressure reservoir to allow the liquid level to rise; When the liquid level rises to the upper limit, the remote control level gauge sends a signal to close the solenoid pilot valve and the main valve to stop supplying liquid to the low-pressure reservoir. In this way, the liquid level of the walk-in cooler low pressure reservoir can be controlled within a certain range.
(2) Principle of abnormal liquid level adjustment: In order to prevent excessive liquid level from occurring due to accidents (excessive liquid level may cause compressor liquid strike accident), a remote control liquid level gauge is used to control. When the liquid level reaches the highest limit position (approximately 70% of the height of the low-pressure circulating liquid storage tank), the remote-control liquid level gauge sends a signal to alarm, and cuts off the power supply of the compressor motor to stop the compressor.
Safety control components of ammonia pump: bypass valve 11, pressure difference controller 12, check valve 14.
(1) Principle of normal liquid supply control of ammonia pump: Since one ammonia pump supplies liquid to several walk-in cooler evaporators, if the temperature of a part of the walk-in cooler has reached a given value, it will cause it The excessive liquid supply of the ammonia pump causes the discharge pressure to rise, which not only slows down the walk-in cooler cooling speed, but also increases the power consumption of the pump. In order to prevent this phenomenon, a bypass valve 11 is installed at the outlet of the pump. When the discharge pressure exceeds a given value, the bypass valve automatically opens to bypass the excess ammonia to the low-pressure circulating tank.
(2) Ammonia pump safety control principle: In order to prevent the ammonia pump from running short of liquid (the short running operation not only does not get enough refrigerant from the walk-in cooler, but also easily causes cavitation damage to the ammonia pump), A pressure difference controller 12 is installed between the outlets. When the pressure difference between the inlet and outlet of the ammonia pump is lower than the given value (0.051MPa), an alarm signal will be issued on the one hand, and the power supply of the ammonia pump will be cut off on the other hand to stop the ammonia pump from working. . In order to prevent the impact of liquid pouring during the stop of the ammonia pump, check valves 14 are installed on the discharge pipeline of the ammonia pump.
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