Brazed plate heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, in particular to a brazed plate heat exchanger, which comprises a plate assembly formed by braze welding of a plurality of arranged plates, a front end plate and a rear end plate are respectively fixed on two sides of the plate assembly, a cold medium inlet and a hot medium inlet are internally connected with liquid distribution pipes with a plurality of small holes, and the front end plate and the rear end plate are respectively provided with a heat exchanger. Four through holes are formed in the four corners of each plate, the liquid distribution pipes penetrate through the inner sides of the through holes, runners can be formed between the through holes in the hot side or the cold side of every two adjacent plates, and cold runners and hot runners are formed in the front faces and the back faces of the plates respectively. Compared with the prior art, the liquid distribution pipe with the small holes is additionally arranged in the medium inlet, so that the medium can be uniformly distributed, protection can be formed before the medium enters the plate through the liquid distribution pipe, and the impact on the plate is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a brazing plate heat exchanger. Background Art

[0002] A heat exchanger is a device that realizes heat transfer between two or more media at different temperatures. Existing brazed plate heat exchangers, such as the high-pressure and high-efficiency plate heat exchanger disclosed in publication number CN209672904U, improve the heat exchange effect and rigidity of the plate by setting small dot-shaped bosses on the corrugated protrusions on the plate. However, if the number of plates in the heat exchanger is large and the medium inlet is far from the plate at the tail end, the medium cannot flow evenly into the flow channel; and when the heat exchanger is turned on, the pressure of the medium changes greatly, which will cause a greater impact on the plate and shorten the life of the heat exchanger. Summary of the invention

[0003] The utility model provides a brazed plate heat exchanger to overcome the deficiencies of the prior art.

[0004] In order to achieve the above-mentioned purpose, a brazed plate heat exchanger is designed, including a plate assembly formed by brazing a plurality of plates after being arranged, a front end plate and a rear end plate are fixed on both sides of the plate assembly, a hot medium inlet is provided at the upper right corner of the front face of the front end plate, a hot medium outlet is provided at the lower right corner of the front face of the front end plate, a cold medium inlet is provided at the lower right corner of the front face of the rear end plate, a cold medium outlet is provided at the upper right corner of the front face of the rear end plate, the cold medium inlet and the hot medium inlet are connected with a liquid distributor with a plurality of small holes, four through holes are provided at the four corners of the plate, the liquid distributor passes through the inner side of the through holes, and flow channels can be formed only between the through holes on the hot side or the cold side between adjacent plates, and cold and hot flow channels are formed on the front and back sides of the plate, respectively.

[0005] One end of the liquid dispensing pipe is connected with the hot medium outlet or the cold medium outlet, and the other end is blocked. Small holes are evenly distributed around the liquid dispensing pipe.

[0006] The front end plate and the rear end plate are provided with reinforcement plates at the pipe interface positions.

[0007] The outer peripheries of the two through holes on the left side of the plate are convex upward, and the outer peripheries of the two through holes on the right side are concave downward. The two adjacent plates are welded 180 degrees inverted to each other, the flow channel between the two convex through holes is closed, and the gap between the two concave through holes forms a flow channel.

[0008] The plate is provided with a plurality of herringbone-shaped concave and convex stripes.

[0009] Compared with the prior art, the utility model can evenly distribute the medium by adding a liquid distributing tube with multiple small holes in the medium inlet, and can form a layer of protection before the medium enters the plate through the liquid distributing tube to reduce the impact on the plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the utility model.

[0011] Figure 2 It is an internal schematic diagram of the utility model.

[0012] Figure 3 A schematic diagram of the plate.

[0013] Figure 4 This is the AA section view of the plate.

[0014] Figure 5 This is the BB cross-sectional view of the plate.

[0015] See also Figure 1-Figure 5 , wherein 1 is a plate assembly, 1-1 is a plate, 1-1-1 is a through hole, 2 is a front end plate, 3 is a rear end plate, 4 is a hot medium inlet, 5 is a hot medium outlet, 6 is a cold medium inlet, 7 is a cold medium outlet, 8 is a liquid distribution pipe, 8-1 is a small hole, and 9 is a reinforcing plate. DETAILED DESCRIPTION

[0016] The utility model is further described below with reference to the accompanying drawings.

[0017] like Figure 1-Figure 5 As shown, a front end plate 2 and a rear end plate 3 are fixed on both sides of the plate assembly 1, a hot medium inlet 4 is provided at the upper right corner of the front face of the front end plate 2, a hot medium outlet 5 is provided at the lower right corner of the front face of the front end plate 2, a cold medium inlet 6 is provided at the lower right corner of the front face of the rear end plate 3, a cold medium outlet 7 is provided at the upper right corner of the front face of the rear end plate 3, the cold medium inlet 6 and the hot medium inlet 4 are connected with a liquid distributor 8 with a plurality of small holes 8-1, four through holes 1-1-1 are provided at the four corners of the plate 1-1, the liquid distributor 8 passes through the inner side of the through holes 1-1-1, and flow channels can be formed only between the through holes 1-1-1 on the hot side or the cold side between adjacent plates 1-1, and the front and back sides of the plate 1-1 form cold and hot flow channels, respectively.

[0018] One end of the liquid dispensing tube 8 is connected to the hot medium outlet 5 or the cold medium outlet 7, and the other end is blocked. The outer circle of the liquid dispensing tube 8 is provided with a plurality of evenly distributed small holes 8-1.

[0019] The front end plate 2 and the rear end plate 3 are provided with reinforcement plates 9 at the pipe interface positions.

[0020] The outer peripheries of the two through holes 1-1-1 on the left side of the plate 1-1 are convex upwards, and the outer peripheries of the two through holes 1-1-1 on the right side are concave downwards. The two adjacent plates 1-1 are welded 180 degrees inverted to each other, the flow channel between the two convex through holes 1-1-1 is closed, and the gap between the two concave through holes 1-1-1 forms a flow channel. Figure 3-Figure 4As shown, the through holes 1-1-1 on both sides of the plate 1-1 are located at different heights. When the through holes 1-1-1 are inverted 180 degrees and spliced, the through holes 1-1-1 on one side are closed, and a gap is formed at the through hole position on the other side, so that the cold and hot medium flows flow into different plates at intervals.

[0021] The plate 1-1 is provided with a plurality of herringbone-shaped concave and convex stripes. Figure 5 As shown, the plate 1-1 is provided with concave and convex stripes, and reverse splicing can make the stripes cross to form turbulence, so that the heat of the medium can be fully exchanged.

[0022] When the utility model is used, the cold and hot media enter different liquid dispensing tubes 8 from the cold medium inlet 6 and the hot medium inlet 5 respectively. The reinforcing plate 9 is used to strengthen the strength of the end plate at the inlet and outlet interface. The liquid dispensing tube 8 can resist part of the impact force, and then the medium flows out from the evenly distributed small holes 8-1 into the gap between the liquid dispensing tube 8 and the plate through hole 1-1-1, and enters the gap formed between the depressions of the through holes 1-1-1 of the front and rear plates 1-1 under pressure. Then the medium passes through the herringbone concave-convex stripes to form turbulence, so that the heat is fully exchanged, and finally flows out from the medium outlet.

Claims

1. A brazed plate heat exchanger, characterized in that: The invention comprises a plate assembly (1) formed by arranging and brazing a plurality of plates (1-1), wherein a front plate (2) and a rear plate (3) are fixed to two sides of the plate assembly (1), respectively; a hot medium inlet (4) is provided at the upper right corner of the front face of the front plate (2), a hot medium outlet (5) is provided at the lower right corner of the front face of the front plate (2), a cold medium inlet (6) is provided at the lower right corner of the front face of the rear plate (3), a cold medium outlet (7) is provided at the upper right corner of the front face of the rear plate (3), a liquid distributor (8) having a plurality of small holes (8-1) is connected to the cold medium inlet (6) and the hot medium inlet (4), four through holes (1-1-1) are provided at the four corners of the plate (1-1), the liquid distributor (8) passes through the inner side of the through holes (1-1-1), and flow channels can be formed only between the through holes (1-1-1) on the hot side or the cold side between adjacent plates (1-1), and the front and back sides of the plate (1-1) respectively form cold and hot flow channels.

2. A brazed plate heat exchanger according to claim 1, characterized in that: One end of the liquid separation pipe (8) is connected to the hot medium outlet (5) or the cold medium outlet (7), and the other end is blocked. The outer circle of the liquid separation pipe (8) is provided with a plurality of evenly distributed small holes (8-1).

3. The brazed plate heat exchanger according to claim 1, characterized in that: The front end plate (2) and the rear end plate (3) are provided with reinforcement plates (9) at the pipeline interface positions.

4. The brazed plate heat exchanger according to claim 1, characterized in that: The outer peripheries of the two through holes (1-1-1) on the left side of the plate (1-1) are convex upwards, and the outer peripheries of the two through holes (1-1-1) on the right side are concave downwards; two adjacent plate pieces (1-1) are welded 180 degrees inverted to each other; the flow channel between the two convex through holes (1-1-1) is closed, and the gap between the two concave through holes (1-1-1) forms a flow channel.

5. A brazed plate heat exchanger according to claim 4, characterized in that: The plate (1-1) is provided with a plurality of herringbone-shaped concave and convex stripes.

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