Plate heat exchanger

Abstract

The invention discloses a plate heat exchanger, relates to the field of heat exchangers, and solves the problem that the existing plate heat exchanger is easy to cause particle impurity accumulation, the plate heat exchanger comprises a heat exchanger body and a mounting frame fixedly mounted on the outer side of the heat exchanger body, and a heating medium air inlet pipe and a refrigerant air inlet pipe are fixedly mounted on the outer side of the heat exchanger body; filter screens are arranged at the ends, away from the heat exchanger body, of the heating medium air inlet pipe and the refrigerant air inlet pipe; the cleaning mechanism is used for cleaning impurities on the surface of the filter screen, and the cleaning mechanism is mounted on the outer side of the filter screen; by means of the cleaning mechanism, the filter screen can filter gas entering the heat medium gas inlet pipe and the refrigerant gas inlet pipe, particle impurities are prevented from entering the heat exchange gas body, the particle impurities on the surface of the filter screen are cleaned, the filter screen can filter the gas continuously, and therefore the filtering and blocking preventing effects are achieved.

Description

Technical Field

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

[0002] A heat exchanger is an energy-saving device that transfers heat between two or more fluids at different temperatures. It transfers heat from a fluid with a higher temperature to a fluid with a lower temperature, so that the fluid temperature reaches the specified index of the process to meet the needs of process conditions. It is also one of the main equipment for improving energy utilization.

[0003] In the industrial field, plate heat exchangers are usually used to recover heat energy in exhaust gas, so as to improve the utilization rate of consumption and reduce pollution to the environment. The existing Chinese public patent document: CN118391944A discloses a plate heat exchanger, wherein a first interval is provided between two adjacent heat exchange plate groups, and a second interval is provided between the first heat exchange plate and the second heat exchange plate. The first interval is larger than the second interval. Such an arrangement can make the width of the first heat exchange chamber in the first direction larger, thereby preventing impurities in the liquid medium from accumulating between the first heat exchange plate and the second heat exchange plate, and further preventing blockage in the first heat exchange chamber, so as to improve the service life of the plate heat exchanger and reduce the maintenance cost of the plate heat exchanger. However, the exhaust gas contains a large amount of particulate impurities. If it directly enters the heat exchange chamber, it is easy to cause blockage of the heat exchange chamber, and as the impurities in the heat exchange chamber adhere, the impurities adhere and accumulate, which will affect the heat exchange efficiency. Summary of the invention

[0004] The object of the present invention is to provide a plate heat exchanger to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A plate heat exchanger, comprising: a heat exchanger body and a mounting frame fixedly mounted on the outside of the heat exchanger body, a heat medium inlet pipe and a refrigerant inlet pipe fixedly mounted on the outside of the heat exchanger body, the heat medium inlet pipe is located above the refrigerant inlet pipe, and a filter is provided at one end of the heat medium inlet pipe and the refrigerant inlet pipe away from the heat exchanger body; Also includes: A cleaning mechanism, used for cleaning impurities on the surface of the filter, the cleaning mechanism being installed on the outside of the filter; A material collecting mechanism, used for collecting impurities cleaned from the filter screen, and the material collecting mechanism is installed on the outside of the mounting frame; The fixed pipe mechanism is used for intermittent and continuous cleaning of the filter screen, and the fixed pipe mechanism is installed on the outside of the mounting frame.

[0006] Preferably, the cleaning mechanism includes a mounting plate fixedly mounted on the outer side of the mounting frame, two symmetrically distributed circular boxes are fixedly mounted on the inner side of the mounting plate, a mounting disk is rotatably mounted on the inner side of the circular box, four air inlets corresponding to the sizes of the filter screens are opened on the surface of the mounting disk, an air inlet cylinder is fixedly mounted on the inner side of the air inlet, the size of the air inlet cylinder corresponds to the size of the filter screen, an air inlet pipe is fixedly mounted on the outer side of the circular box, the air inlet pipe and the adjacent filter screen are on the same horizontal line, a positioning rod is fixedly mounted on the outer side of the mounting plate, a driving rod is rotatably mounted on the side of the mounting plate close to the mounting frame, and a synchronous belt is rotatably mounted between the driving rod and the two positioning rods.

[0007] Preferably, the material receiving mechanism includes a positioning plate fixedly mounted on the top of the mounting frame, a piston cylinder fixedly mounted on the top of the positioning plate, a pressure plate is provided above the piston cylinder, the bottom of the pressure plate is fixedly connected to the piston rod of the piston cylinder, a driving motor is fixedly mounted on the outer side of the mounting plate, a turntable is fixedly mounted on the output end of the driving motor, a connecting rod is hingedly mounted on the outer side of the turntable, a hinge point between the connecting rod and the turntable is far away from the center of the turntable, a pulling plate is hingedly mounted on the end of the connecting rod away from the turntable, two symmetrically distributed pulling rods are fixedly mounted between the two ends of the pulling plate and the two ends of the pressure plate, a slag removal port is provided on the outer side of the circular box, an exhaust bucket is fixedly mounted on the outer side of the slag removal port, the exhaust bucket is connected to the positioning plate and the piston cylinder through an air pipe, and a discharge pipe is fixedly mounted on the side of the circular box away from the exhaust bucket.

[0008] Preferably, the fixed pipe mechanism includes a driven rod rotatably mounted on the mounting plate close to the driving rod side, a toothed disc is fixedly mounted on the outer side of the driven rod, a first gear matching the toothed disc is fixedly mounted on the output end of the driving motor, a driven disc is fixedly mounted on the outer side of the driven rod, two racks symmetrically distributed in the center are fixedly mounted on the outer side of the driven disc, a second gear matching the rack is fixedly mounted on the outer side of the driving rod, and the rack can rotate the second gear ninety degrees, two symmetrically distributed plug-ins are slidably mounted on the inner side of the mounting plate, one end of the plug-in block close to the mounting plate is an arc structure, four slots are provided on the outer side of the mounting plate for limiting the insertion of the plug-in block, a slider is fixedly mounted on the outer side of the plug-in block, the slider is slidably mounted on the outer side of the mounting plate, and a positioning spring is fixedly mounted between the two sliders.

[0009] Preferably, the inner side of the air inlet cylinder is a ring-shaped inclined surface structure, and the outer side of the filter screen is made of rubber material.

[0010] Preferably, support sleeves are fixedly mounted on both sides of the positioning plate, and the pull rod is slidably mounted on the inner side of the support sleeves.

[0011] Preferably, a supporting base plate is fixedly mounted on the top of the mounting frame and the mounting plate, and the top of the supporting base plate is fixedly connected to the bottom of the positioning plate.

[0012] Preferably, a sealing plate is fixedly mounted on one end of the exhaust hopper close to the circular box, and a plurality of exhaust holes distributed symmetrically with respect to the center are formed on the surface of the sealing plate.

[0013] Preferably, a storage box is fixedly installed between the two discharge pipes, and a breathable filter bag is fixedly installed at the bottom of the storage box.

[0014] Preferably, a guide sleeve frame is fixedly mounted on one side of the mounting plate close to the slider, and the slider is slidably mounted on the outer side of the guide sleeve frame.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses a cleaning mechanism to enable the filter to filter the gas entering from the heat medium inlet pipe and the refrigerant inlet pipe, prevent particulate impurities from entering the heat exchange body, clean the particulate impurities on the surface of the filter, and enable the filter to continuously filter the gas, thereby achieving the effect of filtering and preventing blockage.

[0016] The present invention uses a material receiving mechanism so that when the mounting plate drives the four air intake cylinders to rotate, the air intake cylinder containing impurities can be aligned with the exhaust bucket, so that the exhaust bucket pushes the impurities in the air intake cylinder into the discharge pipe through the exhaust holes on the sealing plate, and utilizes the reciprocating movement of the pressure plate to enable the piston cylinder to repeatedly transport air into the exhaust bucket, so as to facilitate the comprehensive cleaning of impurities on the surface of the air intake cylinder, thereby achieving the effect of facilitating the cleaning and collection of impurities.

[0017] The present invention uses a fixed pipe mechanism, which can intermittently drive the two racks on the turntable to rotate the second gear when the driving motor is running, so that the second gear drives the two mounting plates to rotate intermittently through the driving rod, thereby realizing continuous cleaning of the filter screen, ensuring normal filtration of the gas by the filter screen, and when the mounting plate rotates, the cooperation of the insert block and the positioning spring is utilized to provide positioning for the mounting plate, thereby achieving a continuous cleaning effect and ensuring continuous heat exchange of the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the mounting frame and the mounting plate in the present invention; Figure 3 It is a schematic diagram of the structure of the turntable and the pull plate in the present invention; Figure 4 It is a schematic diagram of the structure of the air intake pipe and the air intake cylinder in the present invention; Figure 5 It is a schematic diagram of the structure of the toothed disc and the circular box in the present invention; Figure 6 It is a schematic diagram of the sealing plate and the exhaust hopper structure of the present invention; Figure 7 It is a schematic diagram of the structure of the driven disk and the rack in the present invention; Figure 8 It is a schematic diagram of the structure of the insert block and the guide sleeve frame in the present invention.

[0019] In the figure: 1. heat exchanger body; 2. mounting frame; 3. heat medium inlet pipe; 4. refrigerant inlet pipe; 5. filter screen; 6. mounting plate; 7. round box; 8. mounting plate; 9. air inlet cylinder; 10. air inlet pipe; 11. storage box; 12. positioning rod; 13. driving rod; 14. synchronous belt; 15. positioning plate; 16. piston cylinder; 17. pressure plate; 18. guide sleeve frame; 19. driving motor; 20. turntable; 21. connecting rod; 22. pull plate; 23. pull rod; 24. exhaust bucket; 25. breathable filter bag; 26. discharge pipe; 27. driven rod; 28. toothed disc; 29. ​​first gear; 30. driven disc; 31. rack; 32. second gear; 33. plug block; 34. slider; 35. positioning spring; 36. support sleeve; 37. support bottom plate; 38. sealing plate. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figure 1-Figure 8, a plate heat exchanger shown in the figure includes a heat exchanger body 1 and a mounting frame 2 fixedly mounted on the outside of the heat exchanger body 1, a plurality of strip-shaped holes are opened on the outside of the mounting frame 2, so that the mounting frame 2 can be fixed to the outside of the heat exchanger body 1 by bolts, and a heat medium air inlet pipe 3 and a refrigerant air inlet pipe 4 are fixedly mounted on the outside of the heat exchanger body 1, the heat medium air inlet pipe 3 is used to inject gas with a higher temperature, and the cold air entering through the refrigerant air inlet pipe 4 is then heat exchanged through the heat exchanger body 1, the heat medium air inlet pipe 3 is located above the refrigerant air inlet pipe 4, and the heat medium air inlet pipe 3 and the refrigerant air inlet pipe 4 are both provided with a filter 5 at one end away from the heat exchanger body 1, and the impurities in the gas are filtered through the filter 5 to solve the problem of impurity accumulation inside the heat exchanger body 1 and ensure continuous heat exchange of the gas; it also includes: a cleaning mechanism for cleaning impurities on the surface of the filter 5, and the cleaning mechanism is installed on the outside of the filter 5; The cleaning mechanism includes a mounting plate 6 fixedly mounted on the outer side of the mounting frame 2. The mounting frame 2 is in a U-shaped structure, which is convenient for the installation of the mounting plate 6. Two symmetrically distributed circular boxes 7 are fixedly mounted on the inner side of the mounting plate 6. The filter 5 is fixedly mounted on the outer side of the circular box 7. A mounting disk 8 is rotatably mounted on the inner side of the circular box 7. Four air inlets corresponding to the sizes of the filter 5 are provided on the surface of the mounting disk 8, so that the gas can enter the heat medium air inlet pipe 3 or the refrigerant air inlet pipe 4 through the air inlets on the surface of the mounting disk 8 and corresponding to the positions of the filter 5. An air inlet cylinder 9 is fixedly mounted on the inner side of the air inlet. The inner side of the air inlet cylinder 9 is a ring-shaped inclined surface structure, so that when the mounting disk 8 rotates, it can scrape out impurities on the surface of the filter 5 through the air inlet cylinder 9. The design of the inner side of the annular inclined surface of the air inlet cylinder 9 improves the cleaning efficiency of impurities. The outer side of the filter 5 is made of rubber material, which improves the air quality of the filter 5. The sealing between the mounting plate 8 and the air intake cylinder 9 corresponds to the size of the filter screen 5, which is convenient for the air intake cylinder 9 to comprehensively scrape out impurities on the surface of the filter screen 5 and provide guidance for the gas. An air intake pipe 10 is fixedly installed on the outside of the circular box 7. The air intake pipe 10 and the adjacent filter screen 5 are on the same horizontal line. The inner diameter of the air intake pipe 10 is the same as the inner diameter of the air intake cylinder 9, so that the pipeline for conveying gas is connected to the circular box 7 through the air intake pipe 10. A positioning rod 12 is fixedly installed on the outside of the mounting plate 8, and a driving rod 13 is rotatably installed on the side of the mounting plate 6 close to the mounting frame 2. A synchronous belt 14 is rotatably installed between the driving rod 13 and the two positioning rods 12, so that the driving rod 13 can drive the two positioning rods 12 to rotate synchronously through the synchronous belt 14, so that the positioning rod 12 can drive the mounting plate 8 to rotate, which is convenient for the four air intake cylinders 9 to scrape out impurities on the surface of the filter screen 5.

[0022] Example 2: Please refer to Figure 1-Figure 6, this embodiment further explains the first embodiment. The material receiving mechanism shown in the figure includes a positioning plate 15 fixedly mounted on the top of the mounting frame 2. The top of the mounting frame 2 and the mounting plate 6 are fixedly mounted with a supporting bottom plate 37. The top of the supporting bottom plate 37 is fixedly connected to the bottom of the positioning plate 15, so that the two supporting bottom plates 37 provide support for the bottom of the positioning plate 15, thereby improving the stability of the positioning plate 15. A piston cylinder 16 is fixedly mounted on the top of the positioning plate 15. A pressing plate 17 is arranged above the piston cylinder 16. The bottom of the pressing plate 17 is fixedly connected to the piston rod of the piston cylinder 16. When the pressing plate 17 moves, the piston cylinder 16 can discharge air. A driving motor is fixedly mounted on the outer side of the mounting plate 6. 19, the driving motor 19 is located on the side of the mounting plate 6 away from the mounting frame 2, and a turntable 20 is fixedly installed at the output end of the driving motor 19. The turntable 20 is located between the mounting frame 2 and the mounting plate 6. A connecting rod 21 is hingedly installed on the outer side of the turntable 20. The hinge between the connecting rod 21 and the turntable 20 is far away from the center of the turntable 20, so that when the driving motor 19 drives the turntable 20 to rotate, it can drive the connecting rod 21 to make a circular motion with the center of the turntable 20. The end of the connecting rod 21 away from the turntable 20 is hingedly installed with a pull plate 22, and two symmetrically distributed pull rods 23 are fixedly installed between the two ends of the pull plate 22 and the two ends of the pressure plate 17. Support sleeve plates 36 are fixedly installed on both sides of the positioning plate 15, and the pull rod 23 slides The connecting rod 21 is dynamically installed on the inner side of the supporting sleeve 36, so that when the connecting rod 21 rotates, the pulling rod 23 is driven by the pulling plate 22 to move up and down along the inner side of the supporting sleeve 36, so that the pulling rod 23 drives the pressing plate 17 to move synchronously, and the pressing plate 17 can repeatedly press the piston cylinder 16. A slag removal port is opened on the outer side of the circular box 7, and an exhaust bucket 24 is fixedly installed on the outer side of the slag removal port. Air enters through the one-way air intake valve on the piston cylinder 16, and the exhaust bucket 24 is connected to the piston cylinder 16 through the air pipe and the positioning plate 15, so that the piston cylinder 16 inputs air into the exhaust bucket 24, and the exhaust bucket 24 can spray impurities in the air intake cylinder 9 through the slag removal port. The circular box 7 is fixedly installed on the side away from the exhaust bucket 24. There is a discharge pipe 26, which is a sloped structure, so that impurities in the air intake tube 9 can enter the discharge pipe 26 through the blowing of the exhaust hopper 24. A sealing plate 38 is fixedly installed at one end of the exhaust hopper 24 close to the circular box 7. A plurality of exhaust holes are opened on the surface of the sealing plate 38 and are symmetrically distributed. The air is sprayed to the inner side of the air intake tube 9 through the exhaust holes to provide guidance for the air. A storage box 11 is fixedly installed between the two discharge pipes 26. The storage box 11 is fixedly installed on the outer side of the mounting frame 2. A breathable filter bag 25 is fixedly installed at the bottom of the storage box 11, so that the air in the storage box 11 can be discharged from the breathable filter bag 25, and the breathable filter bag 25 cooperates with the storage box 11 to collect impurities.

[0023] Example 3: Please refer to Figure 5-Figure 8, this embodiment further illustrates other embodiments, the fixed pipe mechanism in the figure includes a driven rod 27 rotatably mounted on the side of the mounting plate 6 close to the driving rod 13, a toothed disc 28 is fixedly mounted on the outer side of the driven rod 27, and a first gear 29 matched with the toothed disc 28 is fixedly mounted on the output end of the driving motor 19, so that when the output end of the driving motor 19 rotates, the toothed disc 28 can be driven to rotate through the first gear 29, and the toothed disc 28 can drive the driven rod 27 to rotate, and a driven disc 30 is fixedly mounted on the outer side of the driven rod 27, and the driven rod 27 can The driven plate 30 is able to rotate synchronously. Two racks 31 symmetrically distributed in the center are fixedly installed on the outer side of the driven plate 30. A second gear 32 matched with the rack 31 is fixedly installed on the outer side of the driving rod 13, and the rack 31 can make the second gear 32 rotate 90 degrees, so that when the rack 31 contacts the second gear 32, it can drive the second gear 32 to rotate 90 degrees. As a result, the second gear 32 drives the driving rod 13 to rotate synchronously, so that the driving rod 13 rotates synchronously through the synchronous belt 14, so that the four air intake cylinders 9 on the mounting plate 8 are replaced. Two symmetrically distributed plug blocks 33 are slidably installed on the inner side of the mounting plate 6, and with the rotation of the driven disk 30, the intermittent rotation of the mounting disk 8 is realized, and the four air inlet cylinders 9 can continuously clean the impurities on the surface of the filter screen 5. The end of the plug block 33 close to the mounting disk 8 is an arc-shaped structure, and the outer side of the mounting disk 8 is provided with four slots for the plug block 33 to be limited and inserted, and the outer side of the circular box 7 is provided with an opening for the plug block 33 to slide in a limited position, so that when the mounting disk 8 rotates, it can push the arc surface of the plug block 33 through the slot to move the plug block 33, and the plug block 33 can be moved. A slider 34 is fixedly installed on the outer side of the block 33, and the slider 34 is slidably installed on the outer side of the mounting plate 6. A long groove for the slider 34 to move is opened on the outer side of the mounting plate 6. A positioning spring 35 is fixedly installed between the two sliders 34 to facilitate the movement and reset of the slider 34, so that when the insert block 33 is inserted into the slot, it provides positioning for the mounting plate 8. A guide sleeve frame 18 is fixedly installed on one side of the mounting plate 6 close to the slider 34, and the slider 34 is slidably installed on the outer side of the guide sleeve frame 18 to provide guidance for the movement of the slider 34 and ensure the smooth movement of the slider 34.

[0024] Working principle: First, the staff connects the pipe for conveying hot air with the air intake pipe 10 close to the heat medium air intake pipe 3, and connects the pipe for conveying cold air with the air intake pipe 10 close to the refrigerant air intake pipe 4. The hot air and the cold air enter the installation plate 8 through the air intake pipe 10, and the hot air and the cold air enter the heat medium air intake pipe 3 and the refrigerant air intake pipe 4 respectively through the air intake cylinder 9 aligned with the filter 5, so that the filter 5 filters the impurities in the gas, and the clean gas can enter the heat exchanger body 1, so that the heat exchanger body 1 performs heat exchange, and then the staff starts the drive motor 19, and the drive motor 19 drives the toothed disc 28 to rotate through the first gear 29, so that the toothed disc 28 drives the driven rod 27 to rotate, and the driven rod 27 drives the driven disc 30 to rotate synchronously. When the rack 31 on the moving disk 30 contacts the second gear 32, as the driven disk 30 rotates, the rack 31 can drive the second gear 32 to rotate ninety degrees. At this time, the second gear 32 drives the driving rod 13 to rotate synchronously, so that the driving rod 13 drives the two positioning rods 12 to rotate synchronously through the synchronous belt 14, and the positioning rod 12 can drive the mounting plate 8 to rotate ninety degrees, so that the positions of the four air inlet cylinders 9 on the mounting plate 8 are replaced, and while the air inlet cylinder 9 moves, the air inlet cylinder 9 aligned with the filter screen 5 scrapes out impurities on the surface of the filter screen 5, so that the other air inlet cylinder 9 is aligned with the filter screen 5, ensuring that the filter screen 5 filters the gas normally. Therefore, as the driven disk 30 rotates, the rack 31 can drive the second gear 32 to rotate intermittently, and the air inlet cylinders on the mounting plate 8 are replaced. 9 can continuously clean the impurities on the surface of the filter screen 5. At the same time, the driving motor 19 drives the turntable 20 to rotate synchronously. The turntable 20 pulls the pull plate 22 to move through the connecting rod 21, so that the pull plate 22 drives the pull rod 23 to move along the outer side of the support sleeve 36. The pull rod 23 presses the piston rod on the piston cylinder 16 through the pressure plate 17. The air in the piston cylinder 16 enters the exhaust bucket 24 through the air pipe. Moreover, as the turntable 20 rotates, the connecting rod 21 can repeatedly pull the pull plate 22 up and down, so that the piston cylinder 16 can repeatedly inject air into the exhaust bucket 24, and the outside air can enter the piston cylinder 16 through the one-way air inlet valve on the piston cylinder 16. The air in the exhaust bucket 24 can be sprayed out through the exhaust hole on the sealing plate 38. Out, so that the exhausted air can be sprayed to the air intake cylinder 9 aligned with the exhaust bucket 24, and the impurities on the inside of the air intake cylinder 9 can be sprayed into the discharge pipe 26. The impurities enter the storage box 11 along the discharge pipe 26, and the excess air can be discharged from the breathable filter bag 25. With the continuous air supply of the piston cylinder 16, the impurities in the air intake cylinder 9 can be completely cleaned. Therefore, with the operation of the drive motor 19, the four air intake cylinders 9 can continuously clean the impurities on the filter screen 5 and collect them centrally to ensure the normal operation of the heat exchanger body 1 and solve the problem of impurity accumulation and blockage in the heat exchanger body 1, thereby achieving the effect of continuous cleaning, ensuring continuous heat exchange of the gas, and improving the convenience of later maintenance of the heat exchanger body 1, thereby improving the durability of the heat exchanger body 1.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plate heat exchanger, characterized in that: include: A heat exchanger body (1) and a mounting frame (2) fixedly mounted on the outside of the heat exchanger body (1); a heat medium inlet pipe (3) and a refrigerant inlet pipe (4) are fixedly mounted on the outside of the heat exchanger body (1); and a filter screen (5) is provided at one end of the heat medium inlet pipe (3) and the refrigerant inlet pipe (4) away from the heat exchanger body (1); Also includes: A cleaning mechanism, used for cleaning impurities on the surface of the filter screen (5), the cleaning mechanism being installed on the outside of the filter screen (5); A material collecting mechanism, used for collecting impurities cleaned from the filter screen (5) in a centralized manner, the material collecting mechanism being mounted on the outside of the mounting frame (2); A fixed pipe mechanism is used for intermittent and continuous cleaning of the filter screen (5), and the fixed pipe mechanism is installed on the outside of the mounting frame (2).

2. A plate heat exchanger according to claim 1, characterized in that: The cleaning mechanism comprises a mounting plate (6) mounted on the outside of the mounting frame (2), two circular boxes (7) are fixedly mounted on the inner side of the mounting plate (6), a mounting plate (8) is rotatably mounted on the inner side of the circular box (7), four air inlets corresponding to the size of the filter screen (5) are opened on the surface of the mounting plate (8), an air inlet cylinder (9) is fixedly mounted on the inner side of the air inlet, an air inlet pipe (10) is mounted on the outer side of the circular box (7), a positioning rod (12) is fixedly mounted on the outer side of the mounting plate (8), a driving rod (13) is mounted on the outer side of the mounting plate (6), and a synchronous belt (14) is rotatably mounted between the driving rod (13) and the two positioning rods (12).

3. A plate heat exchanger according to claim 2, characterized in that: The material receiving mechanism comprises a positioning plate (15) mounted on the top of the mounting frame (2), a piston cylinder (16) being mounted on the top of the positioning plate (15), a pressure plate (17) being arranged above the piston cylinder (16), a driving motor (19) being mounted on the outer side of the mounting plate (6), a turntable (20) being mounted on the output end of the driving motor (19), a connecting rod (21) being hingedly mounted on the outer side of the turntable (20), a pulling plate (22) being hingedly mounted on one end of the connecting rod (21), two pulling rods (23) being fixedly mounted between the two ends of the pulling plate (22) and the two ends of the pressure plate (17), an exhaust hopper (24) being mounted on the outer side of the circular box (7), and a discharge pipe (26) being fixedly mounted on the outer side of the circular box (7).

4. A plate heat exchanger according to claim 3, characterized in that: The pipe fixing mechanism comprises a driven rod (27) mounted on the outside of the mounting plate (6), a toothed disc (28) being fixedly mounted on the outside of the driven rod (27), a first gear (29) being fixedly mounted on the output end of the drive motor (19), a driven disc (30) being fixedly mounted on the outside of the driven rod (27), two racks (31) being fixedly mounted on the outside of the driven disc (30), a second gear (32) being fixedly mounted on the outside of the drive rod (13), two insert blocks (33) being slidably mounted on the inside of the mounting plate (6), four slots being provided on the outside of the mounting disc (8), a slider (34) being mounted on the outside of the insert block (33), and a positioning spring (35) being mounted between the two sliders (34).

5. A plate heat exchanger according to claim 2, characterized in that: The inner side of the air inlet cylinder (9) is an annular inclined surface structure, and the outer side of the filter screen (5) is made of rubber material.

6. A plate heat exchanger according to claim 3, characterized in that: Support sleeves (36) are fixedly mounted on both sides of the positioning plate (15), and the pull rod (23) is slidably mounted on the inner side of the support sleeve (36).

7. A plate heat exchanger according to claim 3, characterized in that: A supporting bottom plate (37) is fixedly mounted on the top of both the mounting frame (2) and the mounting plate (6).

8. A plate heat exchanger according to claim 3, characterized in that: A sealing plate (38) is fixedly mounted on one end of the exhaust hopper (24), and a plurality of exhaust holes are formed on the surface of the sealing plate (38).

9. A plate heat exchanger according to claim 3, characterized in that: A storage box (11) is installed between the two discharge pipes (26), and a breathable filter bag (25) is installed at the bottom of the storage box (11).

10. A plate heat exchanger according to claim 4, characterized in that: A guide sleeve frame (18) is fixedly mounted on the outer side of the mounting plate (6), and the sliding block (34) is mounted on the outer side of the guide sleeve frame (18).

Images