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supermarket refrigerated showcase ammonia pump differential pressure controller
author: supermarket refrigerated showcase category: commercial refrigeration Views: 513Time: 2016-08-22
supermarket refrigerated showcase ammonia pump differential pressure controller
supermarket refrigerated showcase ammonia pump differential pressure controller In the ammonia pump refrigeration system, the ammonia pump inlet and outlet pressure difference must be kept above a certain value. In order to avoid cavitation in the ammonia pump, CWK-11 (or RT260A) differential pressure controller is usually used to ensure it. When the pressure difference between the inlet and outlet of the ammonia pump is less than a given value, the controller can automatically cut off the power of the motor and stop the ammonia pump to prevent cavitation and burn the motor, thereby playing a protective role.
The set value of differential pressure can be achieved by adjusting the nut and the main adjusting screw to change the preload of the main spring, while the differential of the differential pressure controller can be achieved by changing the gap between the differential adjusting nut. Working principle of
: When the supermarket refrigerated showcase pressure difference controller is connected to the ammonia pump refrigeration system, if the ammonia pump inlet and outlet pressure difference is lower than the given value (the lower limit is generally 0.04~0.09MPa), the main spring makes the bottom bellows Extend, turn the micro switch to move the contact, so that the contact 2 and 1 are connected, and the delay relay in the external circuit is also connected. If the pressure difference still does not reach the set value within the set time (about 15 seconds), the power supply will be cut off to stop the ammonia pump. Because the canned motor pump is commonly used in ammonia pumps, its graphite bearings need ammonia liquid for lubrication and cooling. The canned motor also needs ammonia liquid for cooling, so the ammonia pump cannot run without liquid. If the pressure difference returns to the fixed value interval within the set time, the contacts 2 and 1 are disconnected under the action of the main spring, the external time relay is disconnected, and the contacts 2 and 3 are connected, and the ammonia pump resumes normal operation. When the ammonia pump just started, the inlet and outlet ammonia hydraulic pressure difference has not been established. Use an external delay relay to ensure that the ammonia pump can run during the process of starting to establish the pressure difference. When the supermarket refrigerated showcase pressure difference is higher than 0.06Mpa, the delay stops ( Generally, the delay is 8 seconds, and the ammonia pump is still not filling, stop the pump), and the ammonia pump runs normally. When the pressure difference of 0.06MPa is not reached after the delay, the pump will stop and alarm.
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