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Liquid-based supermarket refrigerated showcase refrigerant delivery equipment
author: supermarket refrigerated showcase category: walk-in display coolers Views: 574Time: 2016-08-22
liquid-based supermarket refrigerated showcase refrigerant delivery equipment
supermarket refrigerated showcase Ammonia refrigeration systems often use liquid pumps for liquid supply, and liquid pumps are used as power to transport refrigerants. The main structural forms of liquid pumps are gear pumps and canned motor pumps, and canned motor pumps are all centrifugal pumps.
1) Gear pump The gear pump sucks and discharges liquid by means of the relative movement of two gears to produce changes in the volume of the meshing space. The structure of the gear pump is simple, the flow is uniform and not affected by pressure changes, but the gear is easy to wear and cause refrigerant leakage. The gear pump is used as an infusion pump, suitable for small flow and high head occasions, but its discharge end should be equipped with a safety bypass valve to communicate with the suction end or low-pressure circulation reservoir to achieve safety protection. The structure of the liquid supply gear pump for the ammonia refrigeration system.
2) The typical canned motor pump used in the ammonia refrigeration system of the canned motor pump uses the centrifugal impeller to rotate at a high speed to convert the mechanical energy into the kinetic energy and pressure energy of the liquid to achieve the purpose of transporting ammonia liquid. This type of canned motor pump has compact structure, small volume, large flow and head selectivity, good sealing performance, and long service life, but its flow rate changes with the pressure head and has a greater impact, and it is easy to produce cavitation . The centrifugal canned motor pump has good applicability. As long as there is enough static liquid column at the suction end, the start of the pump and continuous liquid supply can be guaranteed. Ammonia supermarket refrigerated showcase The structure of the liquid supply canned motor pump used in the cold system is divided into two types: vertical and horizontal, of which the vertical is more.
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