Plate heat exchanger with cleaning mechanism

Abstract

The invention discloses a plate heat exchanger with a cleaning mechanism, which comprises a plate heat exchanger, a cleaning storage tank and a filtering mechanism, and realizes flexible switching of three working modes of cleaning fluid circulating cleaning, clean water rinsing and process water heat exchange through cooperative cooperation of a first pipeline system, a second pipeline system and a third pipeline system which are composed of a plurality of three-way valves. The filtering mechanism adopts a filtering net piece capable of turning over by 180 degrees, is driven by a worm and gear mechanism, and is matched with a telescopic supporting mechanism, so that the structural stability during filtering can be ensured, efficient backwashing can be realized, and the system has the advantages of high cleaning efficiency, recyclable cleaning liquid, reduction of operation cost and the like, has an online leakage detection function, and is suitable for popularization and application. The problems that a traditional plate heat exchanger is difficult to clean and high in maintenance cost are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plate heat exchangers, in particular to a plate heat exchanger with a cleaning mechanism. BACKGROUND

[0002] As a kind of efficient, compact heat exchange equipment, plate heat exchanger is widely used in chemical, pharmaceutical, food, heating and other industries in the process, which is internally stacked by a series of metal plates with specific corrugation, forming a complex narrow flow channel, however, it is this structural feature that makes plate heat exchanger prone to fouling during operation, calcium and magnesium ions, organic matter, suspended particles and other impurities in the fluid will continuously deposit on the surface of the plate, forming a dirt layer, which not only significantly reduces the heat exchange efficiency and increases energy consumption, but also causes fluid resistance to increase, and even causes flow channel to be blocked, seriously affecting the stability and continuity of production.

[0003] Currently, the cleaning of plate heat exchanger mainly includes disassembly cleaning and online cleaning, disassembly cleaning requires the entire equipment to be shut down, disassembled, and then each plate is manually brushed or chemically soaked, which has the disadvantages of high labor intensity, long downtime, large consumption of cleaning agent, and easy damage to plate sealing pads due to frequent disassembly and assembly.

[0004] In order to overcome the shortcomings of disassembly cleaning, online cleaning systems appear in the prior art, which usually circulate cleaning liquid inside the heat exchanger through external pumps and pipelines to achieve cleaning without disassembly, however, most systems directly discharge the used waste cleaning liquid containing a large amount of dirt after cleaning, which not only wastes chemical cleaning agent and increases operating costs, but also requires a large amount of wastewater to be treated, which does not meet the green and environmentally friendly production concept. SUMMARY

[0005] In view of the above shortcomings in the prior art, the present application aims to provide a plate heat exchanger with high cleaning efficiency, excellent cleaning effect and recycling of cleaning liquid.

[0006] The technical solution adopted by the present application to achieve the above-mentioned purpose is: a plate heat exchanger with a cleaning mechanism, comprising a plate heat exchanger, a cleaning tank, a filtering mechanism, the plate heat exchanger comprising a process water inlet and a process water outlet, the cleaning tank storing cleaning liquid, the cleaning tank being connected with the process water outlet through a first pipeline system, the first pipeline system realizing the pumping of the cleaning liquid into the plate heat exchanger, the pumping of clean water into the plate heat exchanger and the discharge of process water from the plate heat exchanger through valve switching.

[0007] The process water outlet is connected with the filtering mechanism through a second pipeline system, and the second pipeline system realizes the discharge of the cleaning liquid from the plate heat exchanger to the filtering mechanism, the discharge of clean water from the plate heat exchanger to the filtering mechanism and the input of process water to the plate heat exchanger through switching of a valve path.

[0008] The filtering mechanism and the cleaning tank are connected through a third pipeline system, and the third pipeline system realizes the discharge of the filtered cleaning liquid from the filtering mechanism to the cleaning tank, the discharge of the filtered clean water from the filtering mechanism to the outside, and the discharge of the filtered clean water to the outside after backwashing of the filtering mechanism.

[0009] In the above technical solution, the first pipeline system adopts the following structure:

[0010] The first pipeline system comprises a first three-way valve, a second three-way valve and a pump, the first three-way valve comprises a first valve port A, a first valve port B and a first valve port C;

[0011] The second three-way valve comprises a second valve port A, a second valve port B and a second valve port C;

[0012] The water outlet of the cleaning tank is connected with the first valve port A through a first pipeline, the first valve port B is connected with the inlet of the pump through a second pipeline, and the first valve port C is connected with a tap water pipe in the outside through a third pipeline;

[0013] The second valve port A is connected with the process water outlet, the second valve port B is connected with the outlet of the pump through a fourth pipeline, and the second valve port C is fixedly connected with a process water discharge pipe.

[0014] In the above technical solution, the second pipeline system adopts the following structure:

[0015] The second pipeline system comprises a third three-way valve, a process water inlet pipe and a fifth pipeline, the third three-way valve comprises a third valve port A, a third valve port B and a third valve port C;

[0016] The third valve port A is connected with the process water inlet, the third valve port B is connected with the inlet of the filtering mechanism through the fifth pipeline, and the third valve port C is fixedly connected with the process water inlet pipe.

[0017] In the above technical solution, the third pipeline system adopts the following structure:

[0018] The third pipeline system comprises a fourth three-way valve, a sixth pipeline and a seventh pipeline, the fourth three-way valve comprises a fourth valve port A, a fourth valve port B and a fourth valve port C, the fourth valve port A is connected with the outlet of the filtering mechanism, the fourth valve port B is connected with the inlet of the cleaning tank through the sixth pipeline, the fourth valve port C is fixedly connected with the seventh pipeline, and the seventh pipeline is connected with the sewage system.

[0019] In the above technical scheme, the filtering mechanism adopts the following structure:

[0020] The filtering mechanism comprises a filtering box, a filtering screen and a first driving mechanism, the bottom of the filtering box adopts a conical structure, the bottom of the filtering box is fixedly connected with a drain pipe, the drain pipe is connected with the fourth valve port A, and the top of the filtering box is fixedly connected with an inlet pipe.

[0021] The filtering screen is rotationally connected in the filtering box, the filtering surface of the filtering screen corresponds to the inlet pipe, the first driving mechanism is fixedly connected to the filtering box, and the first driving mechanism is power-connected with the filtering screen.

[0022] Further, the structure of the first driving mechanism is that the first driving mechanism comprises a first driving motor, a worm and a worm wheel, a driving shaft is fixedly connected to the filtering screen, the driving shaft is rotationally connected to the filtering box, the worm wheel is fixedly connected to the outer region of the driving shaft, the worm is rotationally connected to the filtering box, the worm is meshingly connected with the worm wheel, the first driving motor is fixedly connected to the filtering box, and the first driving motor is power-connected with the worm.

[0023] Further optimization is that the filtering mechanism further comprises a supporting mechanism, the supporting mechanism comprises a supporting plate and a second driving mechanism, the supporting plate is slidingly connected to the bottom of each side of the filtering screen on the filtering box, the supporting plate is in abutment with the filtering screen, and the second driving mechanism is arranged on the filtering box.

[0024] Further, the structure of the second driving mechanism is that the second driving mechanism comprises a second driving motor, a gear, a first rack and a second rack, a moving frame is fixedly connected to each group of supporting plates, the first rack is fixedly connected to one group of moving frames, the second rack is fixedly connected to the other group of moving frames, the gear is rotationally connected to the filtering box between the first rack and the second rack, the gear is meshingly connected with the first rack and the second rack, the second driving motor is fixedly connected to the filtering box, and the second driving motor is power-connected with the gear.

[0025] To further optimize, a pressure gauge is fixedly connected to the fourth pipe, and a two-way valve is fixedly connected to the fifth pipe.

[0026] In the above technical solution, the first three-way valve, the second three-way valve, the third three-way valve, the fourth three-way valve, and the two-way valve are all electrically controlled valves;

[0027] In addition, the cleaning solution is an alkaline liquid.

[0028] The beneficial effects of this invention are:

[0029] 1. By switching the valves in the first, second, and third piping systems, the cleaning fluid in the cleaning tank can be pumped into the plate heat exchanger to clean the flow channels of the process water inside the plate heat exchanger. This avoids the complexity of disassembling and cleaning the plate heat exchanger, resulting in high cleaning efficiency. Furthermore, the cleaning fluid can be filtered through a filtration mechanism, allowing it to be recycled back into the cleaning tank. This significantly reduces the consumption of cleaning agents. After cleaning, the flow channels of the process water inside the plate heat exchanger can be rinsed with clean water to thoroughly remove residual cleaning fluid and contaminants that have been removed by the cleaning fluid but not flushed away from the heat exchanger and pipes, restoring the system to a clean state.

[0030] 2. In the filtration mechanism, the first drive mechanism can drive the filter screen to rotate 180°, so that the filter surface of the filter screen faces downward. In this way, the clean water injected from the inlet pipe can backwash the filter screen to ensure the high permeability of the filter screen, reduce manual maintenance of the filter screen, and make full use of the clean water. The clean water can be used to rinse the flow channel of the process water inside the plate heat exchanger and backwash the filter screen of the filtration mechanism. The design is reasonable and effective.

[0031] In addition, the bottom of the filter box in the filtration mechanism adopts a conical structure, which facilitates the collection and thorough emptying of impurities and avoids the accumulation of dirt in dead zones;

[0032] 3. In the filtration mechanism, the support mechanism can support the filter screen. That is, during filtration, the support plate extends to support the filter screen to prevent it from being deformed and damaged due to excessive fluid impact. When backwashing is required, the support plate retracts under the action of the second drive mechanism to avoid interfering with the rotation of the filter screen.

[0033] 4. A pressure gauge is installed on the fourth pipe, and a two-way valve is installed on the fifth pipe. The process water inlet pipe can be closed by the third three-way valve, the fifth pipe can be opened, and the two-way valve on the fifth pipe can be closed. The pump continuously pumps the cleaning fluid into the flow channel of the process water inside the plate heat exchanger. At this time, the flow path of the cleaning fluid is completely blocked. The sealing of the flow channel of the process water inside the plate heat exchanger is tested by observing the pressure gauge. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the present invention;

[0035] Figure 2 This is a structural schematic diagram of the present invention from another angle;

[0036] Figure 3 This is a schematic diagram of the process water heat exchange mode in this invention;

[0037] Figure 4 This is a schematic diagram of the cleaning mode in this invention;

[0038] Figure 5 This is a schematic diagram of the rinsing mode in this invention;

[0039] Figure 6 This is a schematic diagram of the filtration mechanism in this invention during filtration.

[0040] Figure 7 for Figure 6 Detailed structural diagram of part a;

[0041] Figure 8 This is a schematic diagram of the structure of the filter screen in this invention when it rotates;

[0042] Figure 9 This is a schematic diagram of the structure of the first driving mechanism in this invention;

[0043] Figure 10 This is a schematic diagram of the backwashing process in this invention;

[0044] Figure 11 for Figure 10 Detailed structural diagram of part b in the middle;

[0045] Figure 12 This is a schematic diagram of the structure of the second driving mechanism in this invention.

[0046] In the diagram: 100 Plate heat exchanger, 101 Process water inlet, 102 Process water outlet;

[0047] 200 Cleaning Tank;

[0048] 300 Filtering mechanism, 301 Filter box, 3011 Pipeline, 3012 Inlet pipe, 302 Filter screen, 3021 Drive shaft, 303 First drive mechanism, 3031 First drive motor, 3032 Worm gear, 3033 Worm wheel, 304 Supporting mechanism, 3041 Support plate, 3042 Second drive mechanism, 3043 Second drive motor, 3044 Gear, 3045 First rack, 3046 Second rack, 3047 Motion frame;

[0049] 400 First Piping System, 401 First Three-Way Valve, 4011 First Valve Port A, 4012 First Valve Port B, 4013 First Valve Port C, 402 Second Three-Way Valve, 4021 Second Valve Port A, 4022 Second Valve Port B, 4023 Second Valve Port C, 403 Pump, 404 First Pipeline, 405 Second Pipeline, 406 Third Pipeline, 407 Fourth Pipeline, 408 Process Water Drainage Pipe;

[0050] 500 Second Piping System, 501 Third Three-Way Valve, 5011 Third Valve Port A, 5012 Third Valve Port B, 5013 Third Valve Port C, 502 Process Water Inlet Pipe, 503 Fifth Pipeline;

[0051] 600 Third Piping System, 601 Fourth Three-Way Valve, 6011 Fourth Valve Port A, 6012 Fourth Valve Port B, 6013 Fourth Valve Port C, 602 Sixth Pipeline, 603 Seventh Pipeline;

[0052] 700 two-way valve;

[0053] 800 pressure gauge. Detailed Implementation

[0054] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0055] Example 1

[0056] Please see Figures 1-5 The present invention provides a plate heat exchanger with a cleaning mechanism, which mainly includes a plate heat exchanger 100, a cleaning tank 200, a filtration mechanism 300, a first piping system 400, a second piping system 500 and a third piping system 600. The plate heat exchanger 100 is provided with a process water inlet 101 and a process water outlet 102. The cleaning tank 200 is used to store cleaning liquid, preferably an alkaline cleaning liquid.

[0057] The first piping system 400 is connected between the cleaning tank 200 and the process water outlet 102 of the plate heat exchanger 100. The first piping system 400 includes a first three-way valve 401, a second three-way valve 402 and a pump 403.

[0058] The first three-way valve 401 has a first valve port A4011, a first valve port B4012 and a first valve port C4013;

[0059] The second three-way valve 402 has a second valve port A4021, a second valve port B4022 and a second valve port C4023;

[0060] The outlet of the cleaning tank 200 is connected to the first valve port A4011 through the first pipe 404, the first valve port B4012 is connected to the inlet of the pump 403 through the second pipe 405, and the first valve port C4013 is connected to the external tap water pipe through the third pipe 406.

[0061] The second valve port A4021 is connected to the process water outlet 102 of the plate heat exchanger 100, the second valve port B4022 is connected to the outlet of the pump 403 through the fourth pipe 407, and the process water drain pipe 408 is fixedly connected to the second valve port C4023.

[0062] The second piping system 500 is connected between the process water inlet 101 of the plate heat exchanger 100 and the filter mechanism 300. The second piping system 500 includes a third three-way valve 501, a process water inlet pipe 502 and a fifth pipe 503.

[0063] The third three-way valve 501 has a third valve port A5011, a third valve port B5012 and a third valve port C5013;

[0064] The third valve port A5011 is connected to the process water inlet 101 of the plate heat exchanger 100, the third valve port B5012 is connected to the inlet of the filter mechanism 300 through the fifth pipe 503, and the process water inlet pipe 502 is fixedly connected to the third valve port C5013.

[0065] The third piping system 600 is connected between the filter mechanism 300 and the cleaning tank 200. The third piping system 600 includes a fourth three-way valve 601, a sixth pipe 602 and a seventh pipe 603.

[0066] The fourth three-way valve 601 has a fourth valve port A6011, a fourth valve port B6012 and a fourth valve port C6013;

[0067] The fourth valve port A6011 is connected to the outlet of the filter mechanism 300, the fourth valve port B6012 is connected to the inlet of the cleaning tank 200 through the sixth pipe 602, and the fourth valve port C6013 is fixedly connected to the seventh pipe 603, which is connected to the external sewage system.

[0068] Please see Figure 3 In the process water heat exchange mode, the valve path is switched by the third three-way valve 501, so that the process water inlet pipe 502 is connected to the process water inlet 101, while the flow path of the fifth pipe 503 is closed. The valve path is switched by the second three-way valve 402, so that the process water outlet pipe 408 is connected to the process water outlet 102, while the flow path of the fourth pipe is closed. In this way, the process water can enter the plate heat exchanger 100 from the process inlet pipe 3012 for heat exchange, and the heat-exchanged process water is discharged from the process water outlet pipe 408.

[0069] Please see Figure 4 In cleaning mode, the valve path is first switched by the first three-way valve 401, allowing the first pipe 404 and the second pipe 405 to flow while the third pipe 406 is closed. The valve path is then switched by the second three-way valve 402, allowing the fourth pipe 407 to flow while the process water drain pipe 408 is closed. The valve path is then switched by the third three-way valve 501, allowing the fifth pipe 503 to flow while the process water inlet pipe 502 is closed. The valve path is then switched by the fourth three-way valve 601, allowing the sixth pipe 602 to flow while the seventh pipe 603 is closed.

[0070] In this way, the cleaning solution is pumped to the process water flow channel inside the plate heat exchanger 100 by the pump 403, thereby cleaning it. The cleaning solution enters the filtration mechanism 300, where impurities in the cleaning solution are filtered out. The filtered cleaning solution then enters the cleaning storage tank 200 for recycling, significantly reducing the consumption of cleaning agent.

[0071] Please see Figure 5 In rinsing mode, the valve path is first switched by the first three-way valve 401, which allows the third pipe 406 and the second pipe 405 to flow, while the first pipe 404 is closed. The valve path is then switched by the second three-way valve 402, which allows the fourth pipe 407 to flow and the process water drain pipe 408 to be closed. The valve path is then switched by the third three-way valve 501, which allows the fifth pipe 503 to flow and the process water inlet pipe 502 to be closed. The valve path is then switched by the fourth three-way valve 601, which allows the sixth pipe 602 to be closed and the seventh pipe 603 to flow.

[0072] In this way, external clean water is pumped to the process water flow channel inside the plate heat exchanger 100 by the pump 403, thereby rinsing it to thoroughly wash away residual cleaning liquid and stripped dirt. The rinsed clean water passes through the filter mechanism 300 and is discharged through the seventh pipe 603.

[0073] Furthermore, a two-way valve 700 is installed on the fifth pipe 503, and a pressure gauge 800 is installed on the fourth pipe 407. Before entering the cleaning mode, the two-way valve 700 on the fifth pipe 503 can be closed to allow the pumped cleaning fluid to build up pressure in the system. By observing the reading of the pressure gauge 800 on the fourth pipe 407, the sealing performance of the internal flow channel of the plate heat exchanger 100 can be tested.

[0074] In this embodiment, the first three-way valve 401, the second three-way valve 402, the third three-way valve 501, the fourth three-way valve 601, and the two-way valve 700 are preferably electrically controlled valves to facilitate the automated control of the entire cleaning process.

[0075] Example 2

[0076] Please seeFigures 6-12 The present invention provides a plate heat exchanger with a cleaning mechanism. This embodiment, based on embodiment 1, provides a filtration mechanism 300.

[0077] The filtration mechanism 300 includes a filter box 301, a filter screen 302, a first drive mechanism 303, and a support mechanism 304. The bottom of the filter box 301 is designed with a conical structure to facilitate the collection of impurities. A drain pipe 3011 is fixedly connected to the bottom of the filter box 301, which is connected to the fourth valve port A6011. An inlet pipe 3012 is fixedly connected to the top of the filter box 301, which is connected to the fifth pipe 503.

[0078] The filter screen 302 is rotatably connected to the inside of the filter box 301 via the drive shaft 3021, and its filter surface corresponds to the inlet pipe 3012 at the top of the filter box 301.

[0079] The first drive mechanism 303 is used to drive the filter screen 302 to rotate. It includes a first drive motor 3031, a worm 3032 and a worm wheel 3033. The worm wheel 3033 is fixedly mounted on the drive shaft 3021. The worm 3032 is rotatably supported on the filter box 301 and meshes with the worm wheel 3033. The first drive motor 3031 is fixedly mounted on the filter box 301 and its output shaft is connected to the worm 3032, so that the filter screen 302 can be rotated 180 degrees through the worm and worm wheel transmission pair.

[0080] The support mechanism 304 is used to support the filter screen 302. It includes a support plate 3041 and a second drive mechanism 3042. The support plate 3041 is slidably connected to the filter box 301 and is located at the bottom of both sides of the filter screen 302. It can contact the bottom edge of the filter screen 302 to play a supporting role.

[0081] The second drive mechanism 3042 is used to synchronously drive the two support plates 3041 to move in opposite or opposite directions in a linear motion. It includes a second drive motor 3043, a gear 3044, a first rack 3045, and a second rack 3046. That is, a moving frame 3047 is fixedly connected to the outer side of each support plate 3041. The first rack 3045 is fixedly installed on one moving frame 3047, and the second rack 3046 is fixedly installed on the other moving frame 3047. A gear 3044 is rotatably installed on the filter box 301 and is located between the first rack 3045 and the second rack 3046. It meshes with the first rack 3045 and the second rack 3046. The second drive motor 3043 is fixedly installed on the filter box 301, and its output shaft is connected to the gear 3044. Thus, it can synchronously drive the two sets of support plates 3041 to extend or retract through the gear and rack transmission pair.

[0082] In this filtration mechanism 300, the rinsing mode can be used to achieve self-backwashing. That is, after the rinsing mode has been running for a period of time, the final water is relatively clear. At this time, the second drive motor 3043 drives the gear 3044 to rotate, so that the two sets of moving frames 3047 move in opposite directions until the support plates 3041 on both sides are retracted. Then, the first drive mechanism 303 rotates the filter screen 302 of the filtration mechanism 300 by 180 degrees so that its filter surface faces down. Then, the second drive motor 3043 drives the support plate 3041 to support the filter screen 302.

[0083] Clean water is introduced to backwash the filter, and the washed-off dirt falls into the conical bottom of the filter box 301 under gravity. It is then discharged into the sewage system through the seventh pipe 603 along with the backwash wastewater, thereby achieving online self-cleaning of the filter screen 302 and restoring its filtration capacity.

[0084] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0085] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A plate heat exchanger with a cleaning mechanism, comprising a plate heat exchanger (100), a cleaning tank (200), and a filtration mechanism (300), wherein the plate heat exchanger (100) includes a process water inlet (101) and a process water outlet (102), and the cleaning tank (200) stores a cleaning fluid, characterized in that: The cleaning tank (200) and the process water outlet (102) are connected through a first pipeline system (400). The first pipeline system (400) realizes the pumping of the cleaning liquid into the plate heat exchanger (100), the pumping of clean water into the plate heat exchanger (100), and the discharge of process water from the plate heat exchanger (100) through valve switching. The process water outlet (102) is connected to the filter mechanism (300) through a second pipeline system (500). The second pipeline system (500) achieves the discharge of cleaning fluid from the plate heat exchanger (100) to the filter mechanism (300), the discharge of clean water from the plate heat exchanger (100) to the filter mechanism (300), and the input of process water to the plate heat exchanger (100) by switching valves. The filter mechanism (300) and the cleaning tank (200) are connected by a third pipeline system (600). The third pipeline system (600) achieves the following by switching valves: the cleaning liquid is discharged from the filter mechanism (300) to the cleaning tank (200) after filtration; clean water is discharged from the filter mechanism (300) to the outside after filtration; and clean water is discharged to the outside after backwashing the filter mechanism (300).

2. A plate heat exchanger with a cleaning mechanism according to claim 1, characterized in that: The first pipeline system (400) includes a first three-way valve (401), a second three-way valve (402), and a pump (403). The first three-way valve (401) includes a first valve port A (4011), a first valve port B (4012), and a first valve port C (4013). The second three-way valve (402) includes a second valve port A (4021), a second valve port B (4022), and a second valve port C (4023); The outlet of the cleaning tank (200) is connected to the first valve port A (4011) through the first pipe (404), the first valve port B (4012) is connected to the inlet of the pump (403) through the second pipe (405), and the first valve port C (4013) is connected to the external tap water pipe through the third pipe (406). The second valve port A (4021) is connected to the process water outlet (102), the second valve port B (4022) is connected to the outlet of the pump (403) through the fourth pipe (407), and the second valve port C (4023) is fixedly connected to the process water drain pipe (408).

3. A plate heat exchanger with a cleaning mechanism according to claim 2, characterized in that: The second piping system (500) includes a third three-way valve (501), a process water inlet pipe (502), and a fifth pipe (503). The third three-way valve (501) includes a third valve port A (5011), a third valve port B (5012), and a third valve port C (5013). The third valve port A (5011) is connected to the process water inlet (101), the third valve port B (5012) is connected to the inlet of the filter mechanism (300) through the fifth pipe (503), and the third valve port C (5013) is fixedly connected to the process water inlet pipe (502).

4. A plate heat exchanger with a cleaning mechanism according to claim 3, characterized in that: The third pipeline system (600) includes a fourth three-way valve (601), a sixth pipeline (602), and a seventh pipeline (603). The fourth three-way valve (601) includes a fourth valve port A (6011), a fourth valve port B (6012), and a fourth valve port C (6013). The fourth valve port A (6011) is connected to the outlet of the filter mechanism (300). The fourth valve port B (6012) is connected to the inlet of the cleaning tank (200) through the sixth pipeline (602). The fourth valve port C (6013) is fixedly connected to the seventh pipeline (603), and the seventh pipeline (603) is connected to the sewage system.

5. A plate heat exchanger with a cleaning mechanism according to claim 4, characterized in that: The filtration mechanism (300) includes a filter box (301), a filter screen (302), and a first drive mechanism (303). The bottom of the filter box (301) adopts a conical structure. A drain pipe (3011) is fixedly connected to the bottom of the filter box (301). The drain pipe (3011) is connected to the fourth valve port A (6011). An inlet pipe (3012) is fixedly connected to the top of the filter box (301). The filter screen (302) is rotatably connected inside the filter box (301). The filter surface of the filter screen (302) corresponds to the inlet pipe (3012). The first drive mechanism (303) is fixedly connected to the filter box (301). The first drive mechanism (303) is poweredly connected to the filter screen (302).

6. A plate heat exchanger with a cleaning mechanism according to claim 5, characterized in that: The first drive mechanism (303) includes a first drive motor (3031), a worm (3032), and a worm wheel (3033). A drive shaft (3021) is fixedly connected to the filter screen (302), and the drive shaft (3021) is rotatably connected to the filter box (301). The worm wheel (3033) is fixedly connected to the outer area of ​​the drive shaft (3021). The worm (3032) is rotatably connected to the filter box (301), and the worm (3032) meshes with the worm wheel (3033). The first drive motor (3031) is fixedly connected to the filter box (301), and the first drive motor (3031) is poweredly connected to the worm (3032).

7. A plate heat exchanger with a cleaning mechanism according to claim 6, characterized in that: The filtration mechanism (300) further includes a support mechanism (304), which includes a support plate (3041) and a second drive mechanism (3042). The support plate (3041) is slidably connected to both sides of the bottom of the filter screen (302) on the filter box (301). The support plate (3041) abuts against the filter screen (302). The filter box (301) is provided with the second drive mechanism (3042). The second drive mechanism (3042) cooperates with the support plate (3041) so that the second drive mechanism (3042) can drive the support plate (3041) to move linearly.

8. A plate heat exchanger with a cleaning mechanism according to claim 7, characterized in that: The second drive mechanism (3042) includes a second drive motor (3043), a gear (3044), a first rack (3045), and a second rack (3046). Each set of support plates (3041) is fixedly connected to a motion frame (3047). One set of motion frames (3047) is fixedly connected to the first rack (3045), and another set of motion frames (3047) is fixedly connected to the second rack (3046). The filter box (301) is rotatably connected to the gear (3044) between the first rack (3045) and the second rack (3046). The gear (3044) meshes with the first rack (3045) and the second rack (3046). The filter box (301) is fixedly connected to the second drive motor (3043), and the second drive motor (3043) is poweredly connected to the gear (3044).

9. A plate heat exchanger with a cleaning mechanism according to claim 4, characterized in that: A pressure gauge (800) is fixedly connected to the fourth pipe (407), and a two-way valve (700) is fixedly connected to the fifth pipe (503).

10. A plate heat exchanger with a cleaning mechanism according to claim 9, characterized in that: The first three-way valve (401), the second three-way valve (402), the third three-way valve (501), the fourth three-way valve (601), and the two-way valve (700) are all electrically controlled valves; The cleaning solution is an alkaline liquid.

Images