Double-wall plate heat exchanger

Abstract

The utility model relates to a double-wall type plate heat exchanger which comprises stacked plates, a heat exchange channel is formed between the plates, the plates are double-wall layer plates and comprise an inner plate and an outer plate, the inner plate and the outer plate are oppositely arranged, the protruding portions of the inner plate and the outer plate are attached, the tail end of the inner plate and the tail end of the outer plate are provided with turnups, and the turnups are connected with the inner plate and the outer plate. The turnup edges of the inner piece and the outer piece are folded in the same direction, and a gap is formed between the turnup edges of the inner piece and the outer piece. According to the double-wall type plate heat exchanger, a single medium channel is of a double-layer structure design, even if internal leakage occurs, the internal leakage can only flow into the gap between the inner plate and the outer plate of the plate, so that the probability of internal leakage of the heat exchanger is reduced, cold and heat exchange of media in the industry can be met, the risk of mixing of the media caused by the internal leakage can be reduced, and the service life of the heat exchanger is prolonged. And the heating and cooling requirements of pure water, large screws and high-risk liquid industries can be met.

Description

Technical Field

[0001] The utility model relates to a double-wall plate heat exchanger. Background Art

[0002] Plate heat exchanger is a high-efficiency and energy-saving heat exchange equipment with many advantages such as high heat transfer efficiency, light weight, small footprint, easy maintenance, etc. Plate heat exchanger is a high-efficiency heat exchanger composed of a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates; the cross-corrugation between the plates not only forms a channel, but also has a pressure-bearing and fixing effect.

[0003] Conventional plate heat exchangers have not been widely promoted in the application areas of pure water, large screw and high-risk liquid industries. The main reason is that the plates are prone to leakage after being subjected to high pressure, causing the risk of medium mixing. The pure water, screw compressors and high-risk liquids selected by this industry cannot be contaminated or mixed with the media. Once the medium is mixed with the medium on the other side, the cost will be extremely high, so their use is limited. Summary of the invention

[0004] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a double-wall plate heat exchanger which reduces the probability of leakage and meets the requirements of high-risk liquid use environments.

[0005] The purpose of the utility model is achieved in this way:

[0006] A double-walled plate heat exchanger comprises stacked plates, with heat exchange channels formed between the plates. A front end plate is provided at the front end of the stacked plates, and a rear end plate is provided at the rear end. The front end plate and the rear end plate press and fix the middle plate. Medium through holes are provided at the same position on the plates, the front end plate and the rear end plate, and each of the medium through holes is connected to the heat exchange channel on the plate. The plates are double-walled plates, namely an inner plate and an outer plate, respectively. The inner plate and the outer plate are placed oppositely, and the raised parts of the inner plate and the outer plate are fitted together. The ends of the inner plate and the outer plate are provided with flanges, and the flanges of the inner plate and the outer plate are folded in the same direction, and a gap is formed between the flanges of the inner plate and the outer plate.

[0007] The front end plate and the rear end plate are connected with connecting pipes outside the medium through holes on the surfaces thereof, and the external cold and hot medium pipelines are connected with the connecting pipes.

[0008] The folding angle of the inner sheet is smaller than that of the outer sheet.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] This double-walled plate heat exchanger has a double-layer structure design in a single medium channel. Even if internal leakage occurs, it will only flow into the gap between the inner and outer plates of the plate, thus reducing the probability of internal leakage in the heat exchanger. It can not only meet the hot and cold exchange of the media in this industry, but also reduce the risk of media mixing caused by internal leakage, and can meet the heating and cooling requirements of the pure water, large screw and high-risk liquid industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of the double-wall plate heat exchanger of the utility model.

[0012] Figure 2 for Figure 1 Front view of .

[0013] Figure 3 for Figure 2 Cross-section of the double-layer plate.

[0014] Among them: plate 1, front end plate 2, rear end plate 3, medium through hole 4, connecting pipe 5, inner plate 6, outer plate 7, protrusion 8, flange 9. DETAILED DESCRIPTION

[0015] See also Figures 1 to 3 The utility model relates to a double-wall plate heat exchanger, which includes stacked plates 1, and heat exchange channels are formed between the plates 1. The front end of the stacked plates 1 is provided with a front plate 2, and the rear end is provided with a rear plate 3. The front plate 2 and the rear plate 3 press and fix the middle plate 1. Medium through holes 4 are opened at the same position on the plates 1, the front plate 2, and the rear plate 3. The medium through holes 4 are respectively connected to the heat exchange channels on the plates 1, and cold and hot media flow in and out from different medium through holes 4. The front plate 2 and the rear plate 3 are connected with pipes 5 outside the medium through holes 4 on their surfaces, and the external cold and hot medium pipelines are connected to the pipes 5, thereby completing the heat exchange of the liquid.

[0016] like Figure 3 The plate 1 is a double-walled plate, which includes an inner plate 6 and an outer plate 7. The inner plate 6 and the outer plate 7 are placed opposite to each other, and the raised parts 8 of the inner plate 6 and the outer plate 7 are attached to each other. The ends of the inner plate 6 and the outer plate 7 are provided with flanges 9, and the flanges 9 of the inner plate 6 and the outer plate 7 are folded in the same direction. The folding angle of the inner plate 6 is smaller than the folding angle of the outer plate 7, and a gap is formed between the flanges 9 of the inner plate 6 and the outer plate 7. When the medium channel between the outer plate 7 and the inner plate 6 of the adjacent plate leaks, the liquid will flow into the gap between the inner plate and the outer plate of the plate, and will be retained from the gap without causing the medium to mix.

Claims

1. Double-wall plate heat exchanger, characterized by: It includes stacked plates, and heat exchange channels are formed between the plates. A front end plate is provided at the front end of the stacked plates, and a rear end plate is provided at the rear end thereof. The front end plate and the rear end plate press and fix the middle plate. Medium through holes are opened at the same position on the plates, and the medium through holes are respectively connected to the heat exchange channels on the plates. The plates are double-walled plates, namely an inner plate and an outer plate. The inner plate and the outer plate are placed oppositely, and the raised parts of the inner plate and the outer plate are fitted together. The ends of the inner plate and the outer plate are provided with flanges, and the flanges of the inner plate and the outer plate are folded in the same direction, and a gap is formed between the flanges of the inner plate and the outer plate.

2. The double-walled plate heat exchanger according to claim 1 is characterized in that: The front end plate and the rear end plate are connected with connecting pipes outside the medium through holes on the surfaces thereof, and the external cold and hot medium pipelines are connected with the connecting pipes.

3. The double-walled plate heat exchanger according to claim 1 is characterized in that: The folding angle of the inner sheet is smaller than that of the outer sheet.

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