Internal heat exchanger for transcritical CO2 refrigerating system and manufacturing method
A technology for internal heat exchangers and refrigeration systems, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as difficult mechanization, high cost, and complex structure
Inactive Publication Date: 2011-09-14
吴植仁
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However, it also has the following disadvantages: the inlet and outlet of the supercritical fluid and subcritical fluid microchannels are on the same side, and to ensure no leakage between the two fluids, two sets of (four) transition heads with complex structures must be used, and more After the brazing of the layered grooved plate bundle, artificial argon arc welding must be used with the four heads; layer spacers need to be set between the grooved plate bundles; the structure is complex, the manufacturing process is many, it is difficult to mechanize, and the cost is high
Complex structure, many manufacturing processes, difficult mechanization, high cost
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[0012] figure 1 is a perspective view of the heat exchange elements of an internal heat exchanger with supercritical fluid and subcritical fluid flowing perpendicular to each other. figure 2 yes figure 1 A-direction view, image 3 yes figure 1 B direction view. It can be seen from the figure that the appearance of the heat exchange core 1 is square. In the middle of the heat exchange core 1 is a row of parallel supercritical fluid channels 3, and the upper and lower rows are subcritical fluid channels 2. The two channels are perpendicular to each other, and the two fluid channels The cross-sectional shapes are circular, rectangular and polygonal. The water equivalent diameter of the supercritical channel is small, and the water equivalent diameter of the subcritical channel is slightly larger. They are based on two models with a total of four parallel micro-groove plates. It is formed by stacking each other, and brazing material is laid between each grooved plate. The gr...
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The invention relates to an internal heat exchanger used in a transcritical CO2 refrigerating heat pump system. After the internal heat exchanger is adopted in the transcritical CO2 refrigerating system, subcritical CO2 at the inlet of a compressor is further overheated and transcritical CO2 is overcooled before throttling so that the efficiency of refrigerating cycle and refrigerating output canbe remarkably improved. A conventional internal heat exchanger has a series of disadvantages. The internal heat exchanger of the invention is characterized in that: a heat exchanging core is formed by laminating three or more parallel micro groove-shaped plates and provided with a subcritical fluid passage and a transcritical fluid passage which are not communicated with each other; the flow directions of subcritical fluid and transcritical fluid in the heat exchanging core are vertical or parallel to each other; brazing materials are arranged among the micro groove-shaped plates; the inlets and the outlets of the subcritical fluid passage and the transcritical fluid passage of the heat exchanging core are not on the same side face and coated with the brazing materials; and the brazing materials are inserted into long grooves milled on an inlet header and an outlet header respectively and fixed so as to perform integral vacuum brazing.
Description
Technical field [0001] The present invention relates to a method for transcritical CO 2 Internal heat exchangers used in refrigeration, heat pump systems. Background technique [0002] As early as 1886, the German engineer Windhausen designed the CO 2 compressor to make CO 2 Refrigeration system is applied. By the 1940s, it was replaced by CFCs, which were considered safe refrigerants at that time. By 1974, American scientists Molian and Rowland published an important report that CFC and HCFC refrigerants would destroy the ozone layer. At present, CFCs refrigerants have been banned, and HCFCs refrigerants are being phased out. Therefore, it is imperative to adopt new environmentally friendly refrigerants. In recent years, CO 2 Due to its unique environmental protection advantages and excellent thermodynamic properties, refrigerants in the world generally tend to use CO in the field of refrigeration and air conditioning. 2 And other natural environment-friendly workin...
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IPC IPC(8): F25B39/00F28F3/12
Inventor 吴植仁
Owner 吴植仁