Backwashing structure of plate heat exchanger

Abstract

The utility model discloses a plate heat exchanger backwashing structure, which belongs to the field of backwashing structures and comprises a bottom plate, a first support and a second support are fixedly connected to the left side and the right side of the top surface of the bottom plate respectively, a plate heat exchanger body is fixedly connected to the top surface of the first support, and a backwashing mechanism is arranged on the right side of the plate heat exchanger body. And the backwashing mechanism comprises a water tank, a hot medium inlet pipe, a cold medium inlet pipe, a first Y-shaped pipe, a first pump body, a hot medium outlet pipe, a cold medium outlet pipe, a second Y-shaped pipe, a filter tank, a blow-off pipe, a second pump body, a fine filter screen and a sealing cover plate. According to the plate type heat exchanger, the aim of quickly backwashing and cleaning the plate type heat exchanger body is achieved, heat exchange plates in the plate type heat exchanger body do not need to be washed and cleaned step by step, the backwashing and cleaning efficiency of the plate type heat exchanger body is improved, washing water can be filtered and recycled, and water resources are saved.

Description

Technical Field

[0001] This utility model relates to the field of backflushing structures, and in particular to a backflushing structure for a plate heat exchanger. Background Technology

[0002] A plate heat exchanger is a high-efficiency heat exchanger composed of a series of metal plates with a specific corrugated shape. Thin rectangular channels are formed between the plates, through which heat exchange occurs. Plate heat exchangers are ideal devices for liquid-liquid and liquid-gas heat exchange. They feature high heat exchange efficiency, low heat loss, compact and lightweight structure, small footprint, wide application, and long service life. Under the same pressure loss conditions, their heat transfer coefficient is 3-5 times higher than that of a tubular heat exchanger, their footprint is one-third that of a tubular heat exchanger, and their heat recovery rate can reach over 90%. Plate heat exchangers are mainly classified into two types: frame type (detachable) and brazed type. The plate types mainly include herringbone corrugated plates, horizontal straight corrugated plates, and dovetail plates.

[0003] In existing technologies, during the heat exchange process of the medium within a plate heat exchanger, impurities within the medium can become trapped inside, leading to blockages and reduced heat exchange efficiency. Therefore, cleaning and maintenance of the plate heat exchanger are necessary. Current methods typically involve backflushing, but this process requires multiple steps. First, flushing water must enter the plate heat exchanger through the hot medium inlet pipe to flush the hot medium's heat exchange plates. Then, cooling water must enter through the cold medium inlet pipe to flush the cold medium's heat exchange plates. This multi-step process is time-consuming and labor-intensive, reducing the cleaning efficiency of the plate heat exchanger. Furthermore, the wastewater is difficult to filter and reuse, resulting in water waste. Utility Model Content

[0004] The main purpose of this invention is to provide a backflushing structure for a plate heat exchanger, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A backflushing structure for a plate heat exchanger includes a base plate. A first support and a second support are fixedly connected to the left and right sides of the top surface of the base plate, respectively. The top surface of the first support is fixedly connected to the plate heat exchanger body. A backflushing mechanism is provided on the right side of the plate heat exchanger body. The backflushing mechanism includes a water tank, a hot medium inlet pipe, a cold medium inlet pipe, a first Y-shaped pipe, a first pump body, a hot medium outlet pipe, a cold medium outlet pipe, a second Y-shaped pipe, a filter box, a drain pipe, a second pump body, a fine filter screen, and a sealing cover. The right side of the plate heat exchanger body is fixedly connected to the hot medium inlet pipe, the cold medium inlet pipe, the hot medium outlet pipe, and the cold medium outlet pipe. A first water inlet is located on the outer wall of the hot medium inlet pipe and the cold medium inlet pipe. A first Y-shaped pipe is fixedly connected between the two pipes via a second valve, and a second Y-shaped pipe is fixedly connected between the first drain outlets on the outer walls of the hot medium discharge pipe and the cold medium discharge pipe via a fourth valve. The first pump body is fixedly connected to the top surface of the water tank, and a water supply pipe is connected between the output end of the first pump body and the first Y-shaped pipe. A water pumping pipe is connected between the input end of the first pump body and the water tank. The filter box and the second pump body are fixedly connected to the top surface of the second bracket, and a connecting pipe is connected between the second Y-shaped pipe and the filter box. The input end of the second pump body is connected to the second drain outlet on the right side of the filter box, and a return pipe is connected between the output end of the second pump body and the water tank. A coarse filter screen and a fine filter screen are fixedly connected inside the filter box.

[0007] Preferably, the water tank is fixedly installed on the top surface of the base plate, and a return port is fixedly installed on the top left side of the water tank, and an outlet is fixedly installed on the bottom right side of the water tank. The first pump body is fixedly installed on the top surface of the water tank, and a pumping pipe is fixedly installed between the input end of the first pump body and the outlet.

[0008] Preferably, a hot medium inlet pipe and a cold medium inlet pipe are fixedly installed on the top right side of the plate heat exchanger body, and a first valve is fixedly installed at the input end of the hot medium inlet pipe and the cold medium inlet pipe, a first water inlet is fixedly installed on the outer wall of the hot medium inlet pipe and the cold medium inlet pipe, and a second valve is fixedly installed between the first water inlet and the first Y-shaped pipe. A water supply pipe is also fixedly installed between the first Y-shaped pipe and the output end of the first pump body.

[0009] Preferably, a hot medium discharge pipe and a cold medium discharge pipe are fixedly installed on the bottom right side of the plate heat exchanger body, and a third valve is fixedly installed on the inlet end of the hot medium discharge pipe and the cold medium discharge pipe, respectively. A first drain outlet is fixedly installed on the outer wall of the hot medium discharge pipe and the cold medium discharge pipe, and a fourth valve is fixedly installed between the first drain outlet and the second Y-shaped pipe. A second water inlet is fixedly installed on the top left side of the filter box, and a connecting pipe is fixedly installed between the second water inlet and the second Y-shaped pipe. A second drain outlet is fixedly installed on the bottom right side wall of the filter box, and a set of symmetrical drain outlets are fixedly installed on the bottom surface of the filter box. A sealing cover is fixedly installed on the top surface of the filter box, and a coarse filter screen and a fine filter screen are fixedly installed inside the filter box from left to right.

[0010] Preferably, the output end of the second pump body is fixedly installed together with the second drain outlet, and a return pipe is fixedly installed between the output end of the second pump body and the return outlet.

[0011] Preferably, a drain valve is fixedly installed at the bottom of the drain outlet, and the drain valve is fixedly installed together with the drain pipe.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In this invention, the backwashing mechanism, in conjunction with the plate heat exchanger body, ensures that the hot and cold media enter the plate heat exchanger body through the hot and cold media inlet pipes respectively, achieving heat exchange. Opening the third valve ensures that the hot and cold media exit the plate heat exchanger body through the hot and cold media outlet pipes respectively. When backwashing of the plate heat exchanger body is required, the first and third valves are closed, and the second and fourth valves are opened. The first pump body draws water from the tank through the pumping pipe and delivers it to the first Y-shaped pipe through the delivery pipe. The first Y-shaped pipe then delivers the water through the first inlet to the hot and cold media inlet pipes respectively, allowing the water to enter the plate heat exchanger body and simultaneously flush and clean the heat exchange plates used in the internal cold and hot channels. After treatment, the wastewater flows through the hot and cold medium discharge pipes into the second Y-shaped pipe, where it converges. It then flows through a connecting pipe into the filter box. The filter box contains coarse and fine filters to remove impurities. The second pump then pumps the filtered water back into the water tank via the return pipe. Opening the drain valve at the bottom of the drain outlet allows the filtered impurities to be discharged through the drain pipe for cleaning. This achieves rapid backwashing of the plate heat exchanger body, eliminating the need for separate flushing of the heat exchange plates in the hot and cold channels within the heat exchanger body. This not only improves the backwashing efficiency of the plate heat exchanger body but also allows for the filtration, recycling, and reuse of the flushing water, saving water resources, reducing the cost of flushing the plate heat exchanger body, and improving environmental friendliness. Attached Figure Description

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a partial structural disassembly diagram of the backwashing mechanism of this utility model;

[0016] Figure 3 This is a schematic diagram showing the disassembled structure of another part of the backwashing mechanism of this utility model;

[0017] Figure 4 This is a cross-sectional schematic diagram of the filter box of this utility model.

[0018] In the diagram: 1. Base plate; 2. First support; 3. Second support; 4. Plate heat exchanger body; 5. Backwashing mechanism; 6. Water tank; 7. Return port; 8. Outlet; 9. Hot medium inlet pipe; 10. Cold medium inlet pipe; 11. First valve; 12. First water inlet; 13. Second valve; 14. First Y-shaped pipe; 15. First pump body; 16. Water supply pipe; 17. Pumping pipe; 18. Hot medium discharge pipe; 19. Cold medium discharge pipe; 20. Third valve; 21. First drain outlet; 22. Fourth valve; 23. Second Y-shaped pipe; 24. Filter box; 25. Second water inlet; 26. Second drain outlet; 27. Sewage outlet; 28. Connecting pipe; 29. ​​Sewage valve; 30. Sewage pipe; 31. Second pump body; 32. Return pipe; 33. Coarse filter screen; 34. Fine filter screen; 35. Sealing cover plate. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] like Figure 1 - Figure 4 As shown, a backflushing structure for a plate heat exchanger includes a base plate 1. A first support 2 and a second support 3 are fixedly connected to the left and right sides of the top surface of the base plate 1, respectively. A plate heat exchanger body 4 is fixedly connected to the top surface of the first support 2. A backflushing mechanism 5 is provided on the right side of the plate heat exchanger body 4. The backflushing mechanism 5 includes a water tank 6, a hot medium inlet pipe 9, a cold medium inlet pipe 10, a first Y-shaped pipe 14, a first pump body 15, a hot medium outlet pipe 18, a cold medium outlet pipe 19, a second Y-shaped pipe 23, a filter box 24, a drain pipe 30, a second pump body 31, a fine filter screen 34, and a sealing cover plate 35. The hot medium inlet pipe 9, cold medium inlet pipe 10, hot medium outlet pipe 18, and cold medium outlet pipe 19 are fixedly connected to the right side of the plate heat exchanger body 4. A first water inlet 12 is located between the hot medium inlet pipe 9 and the cold medium inlet pipe 10. A first Y-shaped pipe 14 is fixedly connected to the second valve 13, and a second Y-shaped pipe 23 is fixedly connected to the first drain outlet 21 on the outer wall of the hot medium discharge pipe 18 and the cold medium discharge pipe 19 through a fourth valve 22. A first pump body 15 is fixedly connected to the top surface of the water tank 6, and a water supply pipe 16 is connected between the output end of the first pump body 15 and the first Y-shaped pipe 14. A water pumping pipe 17 is connected between the input end of the first pump body 15 and the water tank 6. A filter box 24 and a second pump body 31 are fixedly connected to the top surface of the second bracket 3, and a connecting pipe 28 is connected between the second Y-shaped pipe 23 and the filter box 24. The input end of the second pump body 31 is connected to the second drain outlet 26 on the right side of the filter box 24, and a return pipe 32 is connected between the output end of the second pump body 31 and the water tank 6. A coarse filter screen 33 and a fine filter screen 34 are fixedly connected inside the filter box 24.

[0021] like Figure 2 As shown, the water tank 6 is fixedly installed on the top surface of the base plate 1, and a return port 7 is fixedly installed on the top left side of the water tank 6, and an outlet 8 is fixedly installed on the bottom right side of the water tank 6. The first pump body 15 is fixedly installed on the top surface of the water tank 6, and a water suction pipe 17 is fixedly installed between the input end of the first pump body 15 and the outlet 8. When the first pump body 15 is turned on, the flushing water in the water tank 6 can be drawn out from the outlet 8 through the water suction pipe 17 installed on the input end, so that the water can flush and clean the inside of the plate heat exchanger body 4.

[0022] like Figure 2 As shown, a hot medium inlet pipe 9 and a cold medium inlet pipe 10 are fixedly installed on the top right side of the plate heat exchanger body 4, respectively. A first valve 11 is fixedly installed at the inlet ends of the hot medium inlet pipe 9 and the cold medium inlet pipe 10, respectively. A first water inlet 12 is fixedly installed on the outer wall of the hot medium inlet pipe 9 and the cold medium inlet pipe 10, respectively. A second valve 13 is fixedly installed between the first water inlet 12 and the first Y-shaped pipe 14. A water supply pipe 16 is also fixedly installed between the first Y-shaped pipe 14 and the output end of the first pump body 15. The operation is controlled by opening or closing the first valve 11. The hot and cold media can be controlled to enter the plate heat exchanger body 4 through the hot media inlet pipe 9 and the cold media inlet pipe 10 respectively. The second valve 13 is opened so that the first pump body 15 draws out water and delivers it to the first Y-shaped pipe 14 through the water supply pipe 16. The water is then split and flows into the hot media inlet pipe 9 and the cold media inlet pipe 10 through the first water inlet 12 respectively. Then, it enters the interior of the plate heat exchanger body 4 through the hot media inlet pipe 9 and the cold media inlet pipe 10, so as to achieve the purpose of backwashing and cleaning all the heat exchange plates in the plate heat exchanger body 4 at the same time.

[0023] like Figure 3 and Figure 4As shown, a hot medium discharge pipe 18 and a cold medium discharge pipe 19 are fixedly installed on the bottom right side of the plate heat exchanger body 4, respectively. A third valve 20 is fixedly installed on the inlet end of each of the hot and cold medium discharge pipes 18 and 19. A first drain outlet 21 is fixedly installed on the outer wall of each of the hot and cold medium discharge pipes 18 and 19, respectively. A fourth valve 22 is fixedly installed between the first drain outlet 21 and the second Y-shaped pipe 23. A second inlet 25 is fixedly installed on the top left side of the filter box 24, and a connecting pipe 28 is fixedly installed between the second inlet 25 and the second Y-shaped pipe 23. A second drain outlet 26 is fixedly installed on the bottom right side wall of the filter box 24, and a set of symmetrical drain outlets 27 are fixedly installed on the bottom surface of the filter box 24. A third valve 20 is fixedly installed on the top surface of the filter box 24. The filter box 24 has a sealing cover 35, and a coarse filter screen 33 and a fine filter screen 34 are fixedly installed inside from left to right. By opening or closing the third valve 20, the hot medium and cold medium can be controlled to be discharged from the plate heat exchanger body 4 through the hot medium discharge pipe 18 and the cold medium discharge pipe 19 respectively. When the third valve 20 is closed and the fourth valve 22 is opened, the backwash wastewater in the plate heat exchanger body 4 is discharged from the hot medium discharge pipe 18 and the cold medium discharge pipe 19, and then flows through the second Y-shaped pipe 23 and is discharged into the filter box 24 from the second inlet 25 through the connecting pipe 28. The coarse filter screen 33 and the fine filter screen 34 installed in the filter box 24 will filter and intercept the larger and smaller impurities in the backwash wastewater in turn, so as to filter, recycle and reuse the backwash wastewater and reduce the waste of water resources.

[0024] like Figure 3 and Figure 4 As shown, the output end of the second pump body 31 is fixedly installed together with the second drain port 26, and a return pipe 32 is fixedly installed between the output end of the second pump body 31 and the return port 7. The input end of the second pump body 31 will draw the filtered clean water out of the filter box 24 through the second drain port 26, and pump the clean water from the return port 7 into the water tank 6 for reuse through the return pipe 32 installed on the output end.

[0025] like Figure 3 and Figure 4 As shown, a drain valve 29 is fixedly installed at the bottom of the drain outlet 27, and the drain valve 29 is fixedly installed together with the drain pipe 30. Opening the drain valve 29 at the bottom of the drain outlet 27 allows the impurities filtered by the filter box 24 through the coarse filter screen 33 and the fine filter screen 34 to be discharged into the drain pipe 30, so as to avoid the problem of impurities clogging the filter box 24 and affecting the filtration effect. Opening the sealing cover 35 allows for further cleaning of the coarse filter screen 33 and the fine filter screen 34, thereby facilitating cleaning.

[0026] It should be noted that this utility model is a backflushing structure for a plate heat exchanger. The backflushing mechanism 5 operates on the plate heat exchanger body 4 using the following principle:

[0027] During backwashing of the plate heat exchanger body 4, the first valve 11 on the hot medium inlet pipe 9 and the cold medium inlet pipe 10 is closed to cut off the entry of subsequent hot and cold media into the plate heat exchanger body 4. After all the residual hot and cold media in the plate heat exchanger body 4 are discharged through the hot medium outlet pipe 18 and the cold medium outlet pipe 19, the third valve 20 on the hot medium outlet pipe 18 and the cold medium outlet pipe 19 is closed, and the second valve 13 and the fourth valve 22 are opened. The first pump body 15 installed on the top surface of the water tank 6 is turned on. The input end of the first pump body 15 will draw water for backwashing from the water tank 6 through the liquid outlet 8, and the water will be transported to the first Y-type pump body 15 through the water delivery pipe 16 installed on the output end. When water flows through the first Y-shaped pipe 14, it enters the hot medium inlet pipe 9 and the cold medium inlet pipe 10 through the first inlet 12 installed on the outer wall of the hot medium inlet pipe 9 and the cold medium inlet pipe 10, respectively. Then, it enters the interior of the plate heat exchanger body 4 through the hot medium inlet pipe 9 and the cold medium inlet pipe 10. This can simultaneously flush and clean the impurities on the heat exchange plates of the hot and cold channels used for the hot and cold media in the plate heat exchanger body 4. The backwash wastewater formed after cleaning will be discharged through the hot medium discharge pipe 18 and the cold medium discharge pipe 19 and enter the second Y-shaped pipe 23 for confluence. After that, it will be discharged into the filter box 24 through the second inlet 25 via the connecting pipe 28. The backwash wastewater enters the filter box 24. As the water passes through the coarse filter 33 and fine filter 34 installed inside the filter box 24 from left to right, the coarse filter 33 and fine filter 34 will filter and intercept the larger and smaller impurities carried in the backwash wastewater. The output end of the second pump body 31 will draw out the filtered water from the filter box 24 through the second drain port 26 and transport it from the outlet port 8 to the inside of the water tank 6 through the return pipe 32 installed on the output end. This operation is repeated 3 to 5 times until the water in the plate heat exchanger body 4 is clear. Then, to prevent impurities from clogging the filter box 24 and affecting the filtration effect, the drain valve 29 can be opened. The impurities filtered through the coarse filter 33 and fine filter 34 in the filter box 24 will then pass through the drain port. 27 is discharged into the drain pipe 30, and the sealing cover 35 is opened to clean the coarse filter screen 33 and the fine filter screen 34. Finally, the drain valve 29, the second valve 13 and the fourth valve 22 are closed, and the first valve 11 and the third valve 20 are opened to quickly put the plate heat exchanger body 4 into use, thereby achieving the purpose of rapid backwashing and cleaning of the plate heat exchanger body 4. There is no need to rinse and clean the heat exchange plates used in the cold and hot channels inside the plate heat exchanger body 4 in steps. This not only improves the backwashing and cleaning efficiency of the plate heat exchanger body 4, but also allows the flushing water to be filtered, recycled and reused, saving water resources, reducing the cost of rinsing and cleaning the plate heat exchanger body 4, and improving environmental protection.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, various improvements can be made to it without departing from the scope of the present utility model, and components can be replaced with equivalents or some technical features can be replaced with equivalents. All such improvements within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A backflushing structure for a plate heat exchanger, comprising a base plate (1), wherein a first bracket (2) and a second bracket (3) are fixedly connected to the left and right sides of the top surface of the base plate (1), and a plate heat exchanger body (4) is fixedly connected to the top surface of the first bracket (2), characterized in that: The right side of the plate heat exchanger body (4) is provided with a backwashing mechanism (5), which includes a water tank (6), a hot medium inlet pipe (9), a cold medium inlet pipe (10), a first Y-shaped pipe (14), a first pump body (15), a hot medium outlet pipe (18), a cold medium outlet pipe (19), a second Y-shaped pipe (23), a filter box (24), a drain pipe (30), a second pump body (31), a fine filter screen (34), and a sealing cover plate (35). The right side of the plate heat exchanger body (4) is fixedly connected to the hot medium inlet pipe (9), the cold medium inlet pipe (10), the hot medium outlet pipe (18), and the cold medium outlet pipe (19). The first Y-shaped pipe (14) is fixedly connected between the first inlet (12) on the outer wall of the hot medium inlet pipe (9) and the cold medium inlet pipe (10) through a second valve (13). The hot medium outlet pipe (18) and the cold medium outlet pipe (19) are also fixedly connected to the first Y-shaped pipe (14). A second Y-shaped pipe (23) is fixedly connected between the first drain outlet (21) on the outer wall of 9) through a fourth valve (22). The first pump body (15) is fixedly connected to the top surface of the water tank (6), and a water supply pipe (16) is connected between the output end of the first pump body (15) and the first Y-shaped pipe (14). A water pumping pipe (17) is connected between the input end of the first pump body (15) and the water tank (6). The filter box (24) and the second pump body (31) are fixedly connected to the top surface of the second bracket (3), and a connecting pipe (28) is connected between the second Y-shaped pipe (23) and the filter box (24). The input end of the second pump body (31) is connected to the second drain outlet (26) on the right side of the filter box (24), and a return pipe (32) is connected between the output end of the second pump body (31) and the water tank (6). A coarse filter screen (33) and a fine filter screen (34) are fixedly connected inside the filter box (24).

2. The backflushing structure for a plate heat exchanger according to claim 1, characterized in that: The water tank (6) is fixedly installed on the top surface of the base plate (1), and a return port (7) is fixedly installed on the top left side of the water tank (6). An outlet (8) is fixedly installed on the bottom right side of the water tank (6). The first pump body (15) is fixedly installed on the top surface of the water tank (6), and a pumping pipe (17) is fixedly installed between the input end of the first pump body (15) and the outlet (8).

3. The backflushing structure for a plate heat exchanger according to claim 2, characterized in that: A hot medium inlet pipe (9) and a cold medium inlet pipe (10) are fixedly installed on the top right side of the plate heat exchanger body (4). A first valve (11) is fixedly installed at the input end of the hot medium inlet pipe (9) and the cold medium inlet pipe (10). A first water inlet (12) is fixedly installed on the outer wall of the hot medium inlet pipe (9) and the cold medium inlet pipe (10). A second valve (13) is fixedly installed between the first water inlet (12) and the first Y-shaped pipe (14). A water supply pipe (16) is also fixedly installed between the first Y-shaped pipe (14) and the output end of the first pump body (15).

4. The backflushing structure for a plate heat exchanger according to claim 3, characterized in that: A hot medium discharge pipe (18) and a cold medium discharge pipe (19) are fixedly installed on the bottom right side of the plate heat exchanger body (4). A third valve (20) is fixedly installed on the inlet end of the hot medium discharge pipe (18) and the cold medium discharge pipe (19). A first drain outlet (21) is fixedly installed on the outer wall of the hot medium discharge pipe (18) and the cold medium discharge pipe (19). A fourth valve (22) is fixedly installed between the first drain outlet (21) and the second Y-shaped pipe (23). The filter box (24) A second water inlet (25) is fixedly installed on the top left side of the filter box (24), and a connecting pipe (28) is fixedly installed between the second water inlet (25) and the second Y-shaped pipe (23). A second drain outlet (26) is fixedly installed on the bottom right side wall of the filter box (24), and a set of symmetrical sewage outlets (27) are fixedly installed on the bottom surface of the filter box (24). A sealing cover plate (35) is fixedly installed on the top surface of the filter box (24), and a coarse filter screen (33) and a fine filter screen (34) are fixedly installed inside the filter box (24) from left to right.

5. The backflushing structure for a plate heat exchanger according to claim 4, characterized in that: The output end of the second pump body (31) is fixedly installed together with the second drain outlet (26), and a return pipe (32) is fixedly installed between the output end of the second pump body (31) and the return outlet (7).

6. The backflushing structure for a plate heat exchanger according to claim 5, characterized in that: A drain valve (29) is fixedly installed at the bottom of the drain outlet (27), and the drain valve (29) is fixedly installed together with the drain pipe (30).

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