Brazing plate type heat exchanger adopting dual-ring type distributor

Abstract

The invention discloses a brazing plate type heat exchanger adopting a dual-ring type distributor. The heat exchanger comprises a left plate piece and a right plate piece, a refrigerant inlet round hole is formed by combining the left plate piece and the right plate piece, an inner ring and an outer ring are arranged at the position, corresponding to the refrigerant inlet round hole, between the left plate piece and the right plate piece, and the round centers of the inner ring, the outer ring and the refrigerant inlet round hole are located on the same axis; the outer ring wraps the inner ring, a small inner opening is formed in the inner ring, and a small outer opening is formed in the outer ring. The plate type heat exchanger can increase the pressure drop of a refrigerant on an inlet of the heat exchanger, the flow speed of gaseous refrigerants on the inlet is reduced, the gaseous refrigerants and liquid refrigerants are mixed more evenly, and therefore flow distribution uniformity of the refrigerants on the position between the plate pieces of the heat exchanger is improved, and the heat exchange capacity of the heat exchanger under the evaporation condition is improved by 10% to 20%.

Description

technical field [0001] The invention relates to a brazed plate heat exchanger. Background technique [0002] Brazed plate heat exchanger is a commonly used evaporator component in heat pump air conditioners. It has a compact structure, high heat exchange efficiency, and is widely used. When the brazed plate heat exchanger is used as an evaporator, the fluid on one side is chilled water, and the fluid on the other side is usually refrigerant. The two fluids are separated by the heat exchanger plates for flow heat exchange. Under the condition of evaporation, when the refrigerant enters the plate heat exchanger, it is mostly in a two-phase state, its dryness is usually between 0.1 and 0.5, and the void coefficient is usually above 0.9, that is, the refrigerant gas occupies most of the space, and There is a strong thermodynamic imbalance between gas and liquid, and there is a large velocity slip between the gas phase and the liquid phase, that is, the flow rate of the gaseous ...

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Problems solved by technology

Under the condition of evaporation, when the refrigerant enters the plate heat exchanger, it is mostly in a two-phase state, its dryness is usually between 0.1 and 0.5, and the void coefficient is usually above 0.9, that is, the refrigerant gas occupies most of the space, and There is a strong thermodynamic imbalance between gas and liquid, and there is a large velocity slip between the gas phase and the liquid phase, that is, the flow rate of the gaseous refrigerant is higher than that of the liquid refrigerant, which will cause the gaseous refrigerant to occupy the plate exchange. The heat exchanger is close to the flow channel of the inlet connection, while the liquid refrigerant is blocked by the gaseous refrigerant and flows into the flow channel of the heat exchanger away from the inlet connection, which causes the flow rate of the refrigerant between the plates of the heat exchanger to be different. The amount of heat exchange in each flow channel is also different. In severe cases, the superheat of the refrigerant at the outlet of the heat exchanger will be uneven, the total heat exchange will be reduced, and even local ice blockage will be caused, which will damage the heat exchanger and cause frozen water to infiltrate into the refrigerant. side, resulting in the scrapping of the entire refrigeration system

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