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Supermarket display cases New analysis of industry technology
author: supermarket refrigerated showcase category: commercial refrigeration Views: 562Time: 2016-08-22
Supermarket display cases Compressor is the heart of the refrigeration system. It sucks in low-temperature and low-pressure refrigerant gas from the suction pipe. The motor drives the piston to compress it and discharges high-temperature and high-pressure to the exhaust pipe. The refrigerant gas provides power for the refrigeration cycle, thereby achieving compression → condensation → expansion → evaporation and heat absorption refrigeration cycle. The compressor is generally composed of a housing, a motor, a cylinder, a piston, a control device starter, a thermal protector, and a cooling system. There are basically two types of starters, namely heavy hammer type and PTC type. The latter is more advanced. There are two cooling methods: oil cooling and natural cooling. The main performance indicators of
compressors include: input and output power, coefficient of performance, cooling capacity, starting current, operating current, rated voltage, frequency, cylinder volume, noise, etc. Measure the performance of a compressor, mainly from the comparison of weight, efficiency and noise. The following is a refrigerated showcase refrigeration expert's technical analysis of compressors for supermarket display cases:
The compressors of general household refrigerators and air conditioners use single-phase AC as the power source, and their structural principles are basically the same. Refrigerator compressor power is small, usually below 250W. The compressor power of air curtain cabinets, display cases, island cabinets, cooked food cabinets, a la carte cabinets, cake cabinets, fresh meat cabinets, flower cabinets, and beverage cabinets is usually above 230W. The refrigerant used in the two is different.
1. Specifications, quality” The specifications of the compressor are divided according to the input power. Generally, the difference between each specification is about 50W. In addition, there are also divided by cylinder volume.
2. Type At present, the compressors for household island cabinets are all positive displacement, which can be divided into reciprocating and rotary. The reciprocating compressor uses a piston, crank, connecting rod mechanism or a piston, crank, slide tube mechanism, and the rotary type uses a shaft crank mechanism.
3. According to the scope of application, it can be divided into low back pressure, medium back pressure, and high back pressure. Low back pressure type evaporation temperature -35~-15℃, generally used in household refrigerators, food freezers, etc. Medium back pressure type evaporation temperature is -20~0℃, generally used in cold drink cabinets, milk refrigerators, etc. High back pressure evaporation temperature -5~15℃, generally used in room air conditioners, dehumidifiers, heat pumps, etc. Manufacturing method The compressor is produced in an assembly line. The machining workshop includes casting and manufacturing of cylinder blocks, piston shafts, valve plates, connecting rods, crankshafts, end covers and other parts; assembling rotors and stators in the motor workshop; manufacturing shells in the stamping workshop. Then it is assembled, welded, cleaned and dried in the assembly workshop, and finally packaged and shipped after inspection. Most compressor manufacturers do not produce starters and thermal protectors, but purchase them from the market as needed. As the core of display cases, the compressor of
supermarket display cases plays a very important role, so it is also the most important part.
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