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Previously, semi-closed piston compressors have a wide range of applications, mainly concentrated under 3P-50P power conditions. Especially in the case of playing below 15 degrees, the efficiency is high, the maintenance is convenient, and the performance is stable.
With the changes in the market, in the Freon cold storage project, the concept of “small cooling volume with vortex, large cooling capacity with screw” has been accepted by many customers. The advantages of low temperature scroll compressors are unique, such as: low gas leakage, small volume, light weight, low vibration, reliable operation, low noise, good sealing, energy efficiency ratio, low repair rate and long life.
Of course, what makes users more tempted is the price of scroll compressors. Some equipment manufacturers pointed out: "The previous scroll compressors have achieved such great success, mainly because the cost performance is comparable to that of fully sealed piston compressors and half-sealed piston compressors. The advantages."
"Old diseases and new diseases" alternate, piston compressors encounter more impact
At the same time, with the advancement of scroll compressor manufacturer technology and the advent of large-volume products, it will undoubtedly bring pressure to piston compressors above 15P.
Like Danfoss' MLZ116 medium temperature 15hp freezing vortex, many customers have expressed strong interest, and many customers have successfully applied the product to actual engineering. It is understood that this product has a larger cooling capacity than the same type of product, and the cold storage temperature is faster; considering that the cold storage market pays great attention to the reliability of the compressor, Danfoss has considered all aspects of the scroll and bearing design of the compressor. Optimization; In addition, the market has a large demand for 15hp parallel connection, so the MLZ116 can do multi-machine parallel and step control, thereby expanding the cooling range, improving system energy efficiency under partial load, and reducing annual operating costs. At present, the MLZ116 multi-machine parallel scheme has been reliably operated in many projects and has been recognized by the majority of end users.
Recently, Emerson launched the new Copeland vortex? ZB large commercial refrigeration compressor, with a single machine capacity covering 20~30HP. The new product is an extension of the ZB series medium-high temperature scroll product line, which further optimizes the performance of the compressor for medium-temperature refrigeration applications. It further expands the range of capabilities while ensuring more stable and reliable system operation, and has a higher cost performance. An excellent alternative to high temperature semi-hermetic piston compressors.
In terms of domestic manufacturers, the semi-closed scroll compressor independently developed by Shenyang Shenyi has become the first choice for many users to replace semi-closed pistons. The product has the advantages of maintenance, low noise, and full series, especially the advantages below -18 degrees, which meets the needs of many customers in the market. It can be installed in residential areas. R22 refrigerant can directly reduce the temperature of the library to -30 °C, and increase the efficiency by 30%. The product has three years of market testing and user inspection, and the performance is stable and the quality is reliable.
At the other end, the market above 40P is gradually being occupied by screw compressors. The biggest advantage of screw compressors is that the cooling capacity is large and the investment cost is relatively low, which is suitable for low temperature cold storage. The characteristics of less wearing parts, long maintenance period, high volumetric efficiency, low exhaust gas temperature, insensitivity to liquid hammer and stepless adjustment of cooling capacity make screw refrigeration compressors more and more appreciated by users.
In addition to the traditional vortex and screw extrusion, the revolutionary products and technologies make the semi-closed piston compressors even worse. For example, based on the national emphasis on energy conservation and emission reduction, Fusheng Company combines the advantages of vortex and screw to create a single-stage two-stage compressor with scroll screw, which is 30% more energy efficient than conventional screw and than single-stage two-stage screw compressor. Energy saving 15%.
Fusheng pointed out: "At present, the single-stage two-stage compressor of the scroll screw can achieve a minimum of 15P, and the maximum can be 40P, and its efficiency is at least 30% higher than that of the semi-closed piston. The product has filled the original Fusheng 40P or less. Market gap."
Industrial refrigeration, chiller, Water-cooled screw chiller, industrial chiller, screw chiller, air-cooled chiller, buy products on the Shanghai Shangyu Refrigeration Equipment Co., Ltd., the company is a refrigeration equipment research and development, design, production, sales And high-tech enterprises, such as installation.
At present, Shanghai SUNNY-HVAC's Water-cooled screw chiller, industrial refrigeration, chillers, chillers, Water-cooled screw chiller, screw chillers, and air-cooled chillers have been widely used in chemical, chemical fiber, plastic, grease, food, Pharmaceuticals, military industry, printing, coating, electroplating, electronics and other industries provide high-speed development of China's industry with efficiency and quality assurance.