Plate heat exchanger

Abstract

The invention discloses a plate heat exchanger. The plate heat exchanger comprises plate sheets (21) which are stacked; interplate flow channels are formed among the plate sheets (21); the plate heat exchanger also comprises a flow distributor (22) which is communicated with the interplate flow channels and comprises at least two pipelines which are arranged in parallel; all the interplate flow channels are communicated with an independent pipeline; and adjacent interplate flow channels are communicated with different pipelines of the flow distributor respectively. The flow distributor of the plate heat exchanger at least comprises two pipelines, so that the number of single flowing holes on the plate sheets can be reduced; therefore, the heat exchange efficiency of fluid and the utilization rate of the plate sheets can be improved; an area where the fluid can flow is enlarged, and the fluid can be distributed more uniformly among the plates; and moreover, according to the plate heat exchanger with the structure, pressure drop is easy to adjust, and the fluid distribution condition under the working condition of phase change can be changed.

Description

technical field [0001] The invention relates to the technical field of heat exchange, in particular to a plate heat exchanger. Background technique [0002] The plate heat exchanger has the characteristics of compactness and high efficiency, and is generally used for heat exchange between two fluids, such as liquid-liquid and liquid-gas heat exchange modes, and can also be used in conditions with fluid phase change, such as Condenser, Evaporator. [0003] Please refer to figure 1 , figure 1 It is a schematic diagram of the plate of a typical plate heat exchanger. [0004] The plate heat exchanger generally fixes several pressed plates 1 together in some way, such as brazing, frame fixing, etc., so that the two fluids, cold and hot, pass alternately between the plates to achieve heat exchange, that is, flow in the heat exchanger. The fluids on both sides of a plate 1 are high temperature fluid and low temperature fluid respectively. figure 1 The plate 1 is suitable for a...

AI Technical Summary

Problems solved by technology

[0007] First, by figure 1 It can be seen that in order to realize the distribution of the two fluids between the plates 1 without interfering with each other, the plate 1 needs to be provided with at least four corner holes to form a fluid channel (one kind of fluid needs to be provided with two corner holes). Edge flow or diagonal flow, but for these two flow modes, the fluid between plate 1 cannot be evenly distributed in the area of ​​plate 1 near the two corner holes where the retaining ring is set, this area cannot be effectively used, and still exists The problem of uneven heat transfer and low heat transfer efficiency, when there are more than two types of heat transfer fluid, the number of corner holes is more, the above problems are more significant; moreover, each fluid needs to be provided with two corner holes, at least four corner holes Occupies a larger area of ​​the plate 1, correspondingly reduces the overall utilization of the plate 1, and at the same time, the arrangement of four corner holes in the four corners of the plate 1 also limits the design, shape and related applications of the plate heat exchanger

[0008] Second, the channel composed of corner holes is difficult to ensure the smoothness of circulation. The pressure drop of the fluid flowing in this channel is relatively large, which accounts for a part of the pressure drop of the plate heat exchanger. Due to the limitation of the corner hole structure, the pressure drop is relatively large The problem cannot be effectively reduced, and it cannot be adapted to the needs of different working conditions

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