Plate heat exchanger and fluid distributers and plates thereof

Abstract

The invention discloses a plate heat exchanger and fluid distributers of the plate heat exchanger. A plate heat exchanger comprises a plurality of plates in a stacked mode, wherein the plates are provided with a plurality of layers of herringbone corrugations, and the four corners of each plate are provided with corner holes. Each plate is provided with one fluid disturber. Each fluid distributer comprises a plurality of stacked inter-layer fluid distributers. Each inter-layer fluid distributer includes a fluid distribution structure and a fluid inlet structure, wherein each fluid distribution structure is arranged on the peripheral side of the corresponding first corner hole of the corresponding plate; each fluid inlet structure is arranged on the side wall of the corresponding third corner hole of one corresponding stacked and adjacent plate; the fluid distribution structures and the fluid inlet structures are coaxially and vertically matched, and at least one inter-layer fluid distributer is formed between any two adjacent plates. The fluid distributers can effectively lower fluid resistance, so that uniform atomization is performed on high-pressure fluid, and flow distribution of fluid in inter-plate flow channels is more uniform. In this way, the utilization rate of the plates is increased, and the heat exchange efficiency of the heat exchanger is effectively improved.

Description

Technical field [0001] The invention relates to the technical field of heat exchangers, in particular to a plate heat exchanger and its fluid distributor and plates. Background technique [0002] Plate heat exchangers are widely used in air conditioning, heating, food, chemical, power and machinery industries with their superior heat exchange performance. Ordinary plate plate heat exchangers can exert their advantages in single-phase heat exchange conditions, but in two-phase heat exchange conditions, such as when used as an evaporator, due to the difference in physical properties and flow patterns of gas-liquid two-phase fluids Larger, it is difficult to achieve uniform fluid distribution and uniform flow in the flow channel between the plates. The patent numbers are CN201163159Y, CN103348210A, CN103148727A and other inventions, which are effectively improved on the basis of ordinary plate heat exchangers. Some focus on the uniform distribution of two-phase fluid, and some focu...

AI Technical Summary

Problems solved by technology

[0003] First, most of the distributors of plate heat exchangers use linear injection technology. When high-pressure liquid refrigerant, especially gas-liquid two-phase mixed refrigerant, is sprayed from the distributor hole, it cannot achieve sufficient atomization, which affects the liquid refrigerant. Rapid volatilization, which increases the flow resistance and reduces the heat transfer performance of the heat exchanger

[0004] Second, in the flow channel composed of uniformly distributed corrugated plates, the flow distribution of the fluid is uneven. The flow velocity in the area near the straight line from the inlet to the outlet is relatively high. The farther away from this area, the smaller the flow velocity, and the flow distribution in the flow channel is uneven. Will lead to increased flow resistance and reduced heat transfer performance of the heat exchanger

[0005] Third, after the gas-liquid two-phase mixed refrigerant enters the distributor, it flows into the flow channel between the plates without sufficient pre-mixing, resulting in a large flow resistance, and the flow cannot be effectively and evenly distributed and flow uniformly in the flow channel between the plates, resulting in The pressure drop of the heat exchanger is large and the heat transfer performance is reduced

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