Industrial steam waste heat recycling device and recycling method thereof

Abstract

The invention belongs to the technical field of waste heat recycling, and discloses an industrial steam waste heat recycling device and a recycling method.The industrial steam waste heat recycling device comprises a recycling box, a recycling pipe is installed in the recycling box, the two ends of the recycling pipe penetrate through the interior of the recycling box and extend to the top of the recycling box, and a filtering assembly is arranged at one end of the recycling pipe; the side, away from the recycling pipe, of the filter box is connected with an external pipeline through a flange, steam enters the filter box through the external pipeline, impurities in the steam are filtered through a filter plate, then the steam enters the recycling pipe, water in the recycling box is heated, and steam waste heat recycling is achieved. According to the device, steam is filtered firstly, then waste heat recovery is conducted, the problem that impurities in industrial steam enter a recovery pipe to form scale to hinder heat transfer, and consequently the heat exchange efficiency is affected is solved, efficient and stable operation of the waste heat recovery process is ensured in the mode, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste heat recovery, and specifically relates to an industrial steam waste heat recovery and utilization device and a recovery method thereof. Background Art

[0002] Industrial steam waste heat recovery device is a device or system that captures waste heat emitted by steam systems in industrial production through technical means and converts it into reusable energy. Its core purpose is to improve energy efficiency, reduce carbon emissions and reduce corporate operating costs. After searching, such as patent: CN215893340U, a steam waste heat recovery system for industrial energy saving includes a recovery box, a motor is fixedly connected to the center position on the right side of the recovery box, the driving end of the motor passes through the right side of the recovery box and is fixedly connected to the right end of the stirring shaft, the top right end of the recovery box is fixedly connected to an air inlet pipe, the bottom end of the air inlet pipe is fixedly connected to one end of the recovery pipe, the other end of the recovery pipe is fixedly connected to the bottom end of the air outlet pipe, and the end of the air outlet pipe away from the recovery pipe passes through the top of the recovery box and is fixedly connected to the right side of the purification box. In the present utility model, the recovery pipe is an S-shaped pipe, which increases the time that the steam flows in the recovery box, thereby improving the effect of steam waste heat recovery. The liquid is stirred by the motor so that the liquid absorbs heat evenly, avoiding the problem of uneven heating of the liquid in the recovery box, achieving the purpose of efficient recovery of steam waste heat, and improving the utilization rate of heat. It is worthy of vigorous promotion. During the production and use of industrial steam, various impurities (such as rust, dirt, and particulate matter) inevitably enter the system. If existing waste heat recovery methods are used to heat and recover impure industrial steam, these impurities will enter the recovery pipes along with the steam, easily forming scale. This will significantly hinder heat transfer, affect heat exchange efficiency, and significantly reduce the effectiveness of waste heat recovery. Summary of the Invention

[0003] The object of the present invention is to provide an industrial steam waste heat recovery device and a recovery method thereof to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: an industrial steam waste heat recovery and utilization device, comprising a recovery box, a recovery pipe installed inside the recovery box, both ends of the recovery pipe passing through the interior of the recovery box and extending to the top of the recovery box, and a filter assembly provided at one end of the recovery pipe; The filter assembly includes a filter box arranged at one end of the recovery pipe, and a filter plate is arranged inside the filter box.

[0005] As a further technical scheme of the present application, the filter plate is provided with two, one side of the two filter plates is provided with a control panel, one side of the two control panels is fixedly connected with a first connecting plate, one end of the two first connecting plates away from the control panel is fixedly installed with a first rack plate, the two first rack plates are meshed and connected with a first gear, and the inner wall of the first gear is fixedly installed with a first rotating shaft; The inner wall of the first rack plate is provided with a sliding groove, the inner wall of the sliding groove is slidably installed with a sliding block, one end of the sliding block is fixedly connected with a second connecting plate, and the second connecting plate is slidably installed in the inside of the filter box through a driving assembly.

[0006] As a further technical scheme of the present application, the two first rack plates are symmetrically distributed on both sides of the first gear.

[0007] As a further technical scheme of the present application, the driving assembly comprises an air control plate arranged in the inside of the filter box, first limiting shafts are slidably installed in the inside of the air control plate on both sides, the two first limiting shafts are fixedly installed on the inner wall of the filter box, first springs are sleeved on the outside of the two first limiting shafts, an airflow groove is arranged below the air control plate, and the airflow groove is arranged in the bottom of the filter box. One side of the air control plate is fixedly installed with a third connecting plate, and the third connecting plate is arranged at one end of the second connecting plate.

[0008] As a further technical scheme of the present application, a limiting groove is arranged in the inside of one end of the second connecting plate close to the third connecting plate, a limiting block is embedded in the inside of the limiting groove, and the limiting block is slidably installed in the inside of the filter box.

[0009] As a further technical scheme of the present application, one side of the second connecting plate is fixedly connected with a fixed plate, the fixed plate is slidably installed in the inside of the filter box, and a third spring is arranged between the fixed plate and the filter box.

[0010] As a further technical scheme of the present application, a second limiting shaft is fixedly installed at the top end of the limiting block, and a second spring is sleeved on the outside of the second limiting shaft.

[0011] As a further technical scheme of the present application, the filter plate is slidably connected with the filter box, a handle is fixedly installed at the top end of the filter plate.

[0012] As a further technical scheme of the present application, a sliding rod is fixedly connected at the top end of the first connecting plate, and the sliding rod is slidably installed in the inside of the filter box.

[0013] A recovery method of an industrial steam waste heat recycling device, comprising the following steps: S1: When working, the side of the filter box away from the recovery pipe is connected to an external pipeline through a flange, steam enters the filter box through the external pipeline, the steam is filtered by the filter plate, and then the steam pushes the air control plate to move to the side of the recovery pipe, at the same time, the movement of the air control plate makes the first spring deform to store elastic potential energy, and after the air control plate moves, the steam is discharged to the recovery pipe through the air flow groove, thereby heating the water in the recovery tank, and realizing the recovery and utilization of the waste heat of the steam. S2: When working, when the filter plate performance attenuation leads to the decrease of the gas flow, the elastic potential energy of the first spring is released to push the air control plate to move to the side of the filter plate to reset, the movement of the air control plate drives the movement of the third connecting plate, the third connecting plate moves to the side of the limiting block, when the third connecting plate contacts the limiting block, the limiting block is forced to move up, and one end of the limiting block slides out of the limiting groove, at this time, the elastic potential energy of the third spring is released to move the fixed plate, the movement of the fixed plate drives the second connecting plate to move away from the third connecting plate, the movement of the second connecting plate drives the sliding block to slide on the inner wall of the sliding groove, the first rack plate moves through the arc guide of the sliding groove, the movement of the first rack plate drives the movement of the other first rack plate through the rotation of the first gear, the movement of the first rack plate drives the movement of the first connecting plate, and the movement of the first connecting plate drives the movement of the control plate, so that the two control plates move up and down alternately, and the filter channel is switched. S3: When the control plate moves up to close the air outlet, the slide rod slides out of the top of the filter box, which is convenient for workers to watch, and workers can directly pull out the filter plate without stopping the machine for replacement, and the operation mode is simple and convenient.

[0014] The beneficial effects of the present application are as follows: The present application is provided with a filter assembly, when working, the side of the filter box away from the recovery pipe is connected to an external pipeline through a flange, steam enters the filter box through the external pipeline, and then the steam is filtered by the filter plate and enters the recovery pipe, thereby heating the water in the recovery tank, and realizing the recovery and utilization of the waste heat of the steam, the device filters the steam first and then recovers the waste heat, prevents the impurities in the industrial steam from entering the recovery pipe to form scale and hinder heat transfer, thereby affecting the heat exchange efficiency, and through the above-mentioned mode, the efficient and stable operation of the waste heat recovery process is ensured, and the energy utilization efficiency is improved.

[0015] The present application is provided with a filter assembly, when working, the side of the filter box away from the recovery pipe is connected to an external pipeline through a flange, steam enters the filter box through the external pipeline, and then the steam is filtered by the filter plate and enters the recovery pipe, thereby heating the water in the recovery tank, and realizing the recovery and utilization of the waste heat of the steam, the device filters the steam first and then recovers the waste heat, prevents the impurities in the industrial steam from entering the recovery pipe to form scale and hinder heat transfer, thereby affecting the heat exchange efficiency, and through the above-mentioned mode, the efficient and stable operation of the waste heat recovery process is ensured, and the energy utilization efficiency is improved.

[0016] The application sets the driving assembly, when the filter plate performance attenuation leads to the gas flow rate reduction, the elastic potential energy of the first spring is released to drive the gas control plate to move to the one side of the filter plate, the movement of the gas control plate drives the movement of the third connecting plate, thereby driving the second connecting plate to move, the steam is switched to the standby filter plate without interrupting the steam supply, the continuous operation mode greatly improves the reliability and stability of the system, and reduces the production loss caused by shutdown maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the overall structure schematic diagram of the application; Figure 2 It is the overall structure cross section schematic diagram of the application; Figure 3 It is the overall structure schematic diagram of the application; Figure 2 It is the structure enlarged schematic diagram of A in the application; Figure 4 It is the structure cross section plan view of the filter box in the application; Figure 5 It is the structure cross section side view of the filter box in the application; Figure 6 It is the structure schematic diagram of the gas control plate in the application; Figure 7 It is the structure enlarged schematic diagram of B in the application; Figure 6 It is the structure enlarged schematic diagram of C in the application; Figure 8 Figure 6 It is the structure schematic diagram of the control plate in the application. Figure 9 It is the structure schematic diagram of the control plate in the application.

[0018] In the figure: 1, recovery tank;2, recovery pipe;3, filter box;4, filter plate;5, gas control plate;6, first limit shaft;7, first spring;8, air flow groove;9, control plate;10, first connecting plate;11, first rack plate;12, first gear;13, first rotating shaft;14, sliding block;15, sliding groove;16, second connecting plate;17, third connecting plate;18, limit groove;19, limit block;20, second limit shaft;21, second spring;22, third spring;23, sliding rod;24, handle;25, fixed plate. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application. ​

[0020] like Figures 1 to 9 As shown, in an embodiment of the present invention, an industrial steam waste heat recovery and utilization device includes a recovery box 1, a recovery pipe 2 is installed inside the recovery box 1, both ends of the recovery pipe 2 pass through the interior of the recovery box 1 and extend to the top of the recovery box 1, and a filter assembly is provided at one end of the recovery pipe 2; The filter assembly includes a filter box 3 arranged at one end of the recovery pipe 2, and a filter plate 4 is arranged inside the filter box 3.

[0021] Existing: CN215893340U discloses a steam waste heat recovery system for industrial energy saving. This patent discloses the recovery box 1 and recovery pipe 2 proposed in this application document. This technical means will not be described in detail here; During operation, the side of the filter box 3 away from the recovery pipe 2 is connected to the external pipe through a flange. Steam enters the filter box 3 through the external pipe, and is filtered by the filter plate 4 to remove impurities inside the steam before entering the recovery pipe 2, thereby heating the water in the recovery box 1 and realizing the recovery and utilization of waste heat from the steam. This device filters the steam before recovering the waste heat, preventing impurities inside the industrial steam from entering the recovery pipe 2 to form scale that hinders heat transfer and thus affects the heat exchange efficiency. In this way, the efficient and stable operation of the waste heat recovery process is ensured, and the energy utilization efficiency is improved.

[0022] like Figures 1 to 9 As shown, two filter plates 4 are provided, and a control plate 9 is provided on one side of each of the two filter plates 4. A first connecting plate 10 is fixedly connected to one side of each of the two control plates 9. A first rack plate 11 is fixedly installed on one end of each of the two first connecting plates 10 away from the control plate 9. A first gear 12 is meshed and connected between the two first rack plates 11, and a first rotating shaft 13 is fixedly installed on the inner wall of the first gear 12. A chute 15 is formed on the inner wall of the first rack plate 11 , and a slider 14 is slidably mounted on the inner wall of the chute 15 . One end of the slider 14 is fixedly connected to a second connecting plate 16 , which is slidably mounted inside the filter box 3 through a driving assembly.

[0023] The filter box 3 has two filter chambers formed inside, and the two filter plates 4 are respectively located in the two filter chambers; The air inlet end of the filter box 3 is set in a Y shape, and the two air outlet ends at the top of the Y shape are both provided with a control board 9, and one air outlet end corresponds to one filter chamber; During operation, one control panel 9 opens one gas outlet end, and another control panel 9 closes the other gas outlet end, so that the gas contacts one filter plate 4 for filtration; In operation, the second connecting plate 16 is moved by the driving assembly, the movement of the second connecting plate 16 drives the sliding block 14 to slide on the inner wall of the sliding groove 15, the first rack plate 11 is moved through the arc guidance of the sliding groove 15, the movement of the first rack plate 11 drives the movement of the first connecting plate 10, the movement of the first connecting plate 10 drives the movement of the control plate 9, the two control plates 9 move up and down alternately, so that the industrial steam passes through the filter plate 4 from different filter chambers, preventing the filter plate 4 from working saturated, helping to ensure the filtering effect and improving the system operation stability.

[0024] As shown in Figure 6 and Figure 9 , the two first rack plates 11 are symmetrically distributed on the two sides of the first gear 12.

[0025] As shown in Figures 1 to 9 , the driving assembly comprises an air control plate 5 arranged inside the filter box 3, the first limiting shaft 6 is slidingly installed on the two sides of the air control plate 5, the two first limiting shafts 6 are fixedly installed on the inner wall of the filter box 3, the first spring 7 is sleeved on the outer part of the two first limiting shafts 6, the airflow groove 8 is arranged below the air control plate 5, and the airflow groove 8 is arranged on the bottom of the filter box 3. The third connecting plate 17 is fixedly installed on one side of the air control plate 5, and the third connecting plate 17 is arranged at one end of the second connecting plate 16.

[0026] In operation, the steam pushes the air control plate 5 to move to one side of the recovery pipe 2 after being filtered by the filter plate 4, and the steam is discharged into the recovery pipe 2 through the airflow groove 8; At the same time, the first spring 7 is deformed to store elastic potential energy when the air control plate 5 moves; In operation, when the performance of the filter plate 4 for filtering steam is attenuated, the elastic potential energy of the first spring 7 is released to push the air control plate 5 to move to one side of the filter plate 4 to reset, the movement of the air control plate 5 drives the movement of the third connecting plate 17, so as to drive the movement of the second connecting plate 16, and the standby filter plate 4 is switched to the steam in the case that the steam supply is not interrupted, and the continuous operation mode greatly improves the reliability and stability of the system and reduces the production loss caused by shutdown maintenance.

[0027] As shown in Figure 6 and Figure 7 , the limiting groove 18 is arranged in the inner part of one end of the second connecting plate 16 close to the third connecting plate 17, the limiting block 19 is embedded in the limiting groove 18, and the limiting block 19 is slidingly installed in the inner part of the filter box 3.

[0028] The second connecting plate 16 on the side of the air outlet of the control plate 9 is fixed by the limiting block 19, and the second connecting plate 16 on the side of the air outlet of the control plate 9 is not fixed.

[0029] As shown in Figure 6And Figure 7 As shown in the figure, one side of the second connecting plate 16 is fixedly connected with a fixed plate 25, the fixed plate 25 is slidingly installed in the interior of the filter box 3, and the third spring 22 is installed between the fixed plate 25 and the filter box 3.

[0030] When the gas control plate 5 moves due to the decrease of air pressure, the third connecting plate 17 moves to one side of the limiting block 19, and when the third connecting plate 17 contacts the limiting block 19, the limiting block 19 is forced to move upward, and one end of the limiting block 19 slides out of the limiting groove 18, at this time, the fixed plate 25 moves by releasing the elastic potential energy of the third spring 22, and the movement of the fixed plate 25 drives the second connecting plate 16 to move away from the third connecting plate 17, thereby moving the control plate 9 to switch the filter plate 4. The driving mode of releasing the elastic potential energy of the third spring 22 can realize the effect of rapid switching.

[0031] As shown in the figure, Figure 6 And Figure 7 As shown in the figure, the top end of the limiting block 19 is fixedly installed with a second limiting shaft 20, and the outside of the second limiting shaft 20 is sleeved with a second spring 21.

[0032] When the other second connecting plate 16 moves to the end close to the third connecting plate 17, the second connecting plate 16 contacts the limiting block 19 to force the limiting block 19 to move upward, and when the limiting groove 18 moves to below the limiting block 19, the limiting block 19 is embedded in the limiting groove 18 by releasing the elastic potential energy of the second spring 21 to fix the second connecting plate 16.

[0033] As shown in the figure, Figure 1 , Figure 2 And Figure 3 As shown in the figure, the filter plate 4 is slidingly connected between the filter box 3, and the top end of the filter plate 4 is fixedly installed with a handle 24.

[0034] When the filter plate 4 needs to be replaced, the filter plate 4 can be pulled out and replaced through the handle 24, and the operation mode is simple and convenient.

[0035] As shown in the figure, Figures 1 to 9 The top end of the first connecting plate 10 is fixedly connected with a sliding rod 23, and the sliding rod 23 is slidingly installed in the interior of the filter box 3.

[0036] The sliding rod 23 slides out of the top of the filter box 3 when the control plate 9 closes the air outlet end, which is convenient for workers to watch and replace the filter plate 4 that is not working or has been used, so that the device can be replaced without stopping, and the efficient and stable operation of the waste heat recovery process is ensured.

[0037] A recovery method of an industrial steam waste heat recovery device, comprising the following steps: S1: During operation, the side of the filter box 3 away from the recovery pipe 2 is connected to the external pipe through a flange. Steam enters the filter box 3 through the external pipe. After being filtered by the filter plate 4, the steam pushes the air control plate 5 to move toward the side of the recovery pipe 2. At the same time, the movement of the air control plate 5 causes the first spring 7 to deform and store elastic potential energy. When the air control plate 5 moves, the steam is discharged into the recovery pipe 2 through the air flow groove 8, thereby heating the water in the recovery box 1 and realizing the waste heat recovery of the steam. S2: During operation, when the performance of the filter plate 4 for filtering steam decays and the gas flow rate decreases, the first spring 7 releases elastic potential energy to push the air control plate 5 to move to one side of the filter plate 4 to reset. The movement of the air control plate 5 drives the movement of the third connecting plate 17, so that the third connecting plate 17 moves to one side of the limit block 19. When the third connecting plate 17 contacts the limit block 19, the limit block 19 is forced to move upward, so that one end of the limit block 19 slides out of the limit groove 18. At this time, the third spring 22 releases elastic potential energy to move the fixed plate 25. The fixed plate 25 The movement of the second connecting plate 16 drives the second connecting plate 16 to move to the side away from the third connecting plate 17. The movement of the second connecting plate 16 drives the slider 14 to slide on the inner wall of the slide groove 15. The first rack plate 11 is guided by the arc of the slide groove 15 to move. The movement of the first rack plate 11 drives the other first rack plate 11 to move through the rotation of the first gear 12. The movement of the first rack plate 11 drives the movement of the first connecting plate 10. The movement of the first connecting plate 10 drives the movement of the control plate 9, so that the two control plates 9 move up and down and alternate positions to switch the filtering channel. S3: When the control panel 9 moves upward to close the air outlet, the slide bar 23 slides out of the top of the filter box 3, which is convenient for the staff to watch. The staff can directly pull out the filter plate 4 through the handle 24 and replace it without stopping the machine. The operation is simple and convenient.

[0038] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An industrial steam waste heat recovery and utilization device, comprising a recovery box (1), characterized in that: A recovery pipe (2) is installed inside the recovery box (1), both ends of the recovery pipe (2) pass through the interior of the recovery box (1) and extend to the top of the recovery box (1), and a filter assembly is provided at one end of the recovery pipe (2); The filter assembly comprises a filter box (3) arranged at one end of the recovery pipe (2), and a filter plate (4) is arranged inside the filter box (3).

2. The industrial steam waste heat recovery and utilization device according to claim 1, characterized in that: Two filter plates (4) are provided, and a control plate (9) is provided on one side of each of the two filter plates (4). A first connecting plate (10) is fixedly connected to one side of each of the two control plates (9). A first rack plate (11) is fixedly installed on one end of each of the two first connecting plates (10) away from the control plate (9). A first gear (12) is meshed and connected between the two first rack plates (11), and a first rotating shaft (13) is fixedly installed on the inner wall of the first gear (12). A sliding groove (15) is provided on the inner wall of the first rack plate (11), a slider (14) is slidably mounted on the inner wall of the sliding groove (15), one end of the slider (14) is fixedly connected to a second connecting plate (16), and the second connecting plate (16) is slidably mounted inside the filter box (3) via a driving assembly.

3. The industrial steam waste heat recovery and utilization device according to claim 2, characterized in that: The two first rack plates (11) are symmetrically distributed on both sides of the first gear (12).

4. The industrial steam waste heat recovery and utilization device according to claim 2, characterized in that: The driving assembly includes an air control plate (5) arranged inside the filter box (3), first limiting shafts (6) are slidably installed inside both sides of the air control plate (5), the two first limiting shafts (6) are fixedly installed on the inner wall of the filter box (3), and the outsides of the two first limiting shafts (6) are sleeved with first springs (7), and an air flow groove (8) is provided below the air control plate (5), and the air flow groove (8) is opened at the bottom of the filter box (3); A third connecting plate (17) is fixedly mounted on one side of the air control plate (5), and the third connecting plate (17) is arranged on one end of the second connecting plate (16).

5. The industrial steam waste heat recovery and utilization device according to claim 2, characterized in that: A limiting groove (18) is provided inside one end of the second connecting plate (16) close to the third connecting plate (17), a limiting block (19) is embedded inside the limiting groove (18), and the limiting block (19) is slidably installed inside the filter box (3).

6. The industrial steam waste heat recovery and utilization device according to claim 2, characterized in that: A fixing plate (25) is fixedly connected to one side of the second connecting plate (16), and the fixing plate (25) is slidably mounted inside the filter box (3). A third spring (22) is mounted between the fixing plate (25) and the filter box (3).

7. The industrial steam waste heat recovery and utilization device according to claim 5, characterized in that: A second limiting shaft (20) is fixedly mounted on the top end of the limiting block (19), and a second spring (21) is sleeved on the outside of the second limiting shaft (20).

8. The industrial steam waste heat recovery and utilization device according to claim 1, characterized in that: The filter plate (4) is slidably connected to the filter box (3), and a handle (24) is fixedly mounted on the top end of the filter plate (4).

9. The industrial steam waste heat recovery and utilization device according to claim 2, characterized in that: The top end of the first connecting plate (10) is fixedly connected to a sliding rod (23), and the sliding rod (23) is slidably mounted inside the filter box (3).

10. A recovery method for an industrial steam waste heat recovery device, which is applicable to the industrial steam waste heat recovery device according to claims 1 to 9, characterized in that: The following steps are involved: S1: When working, the side of the filter box (3) away from the recovery pipe (2) is connected to the external pipe through a flange, and steam enters the filter box (3) through the external pipe. After the steam is filtered by the filter plate (4), it pushes the air control plate (5) to move toward the side of the recovery pipe (2). At the same time, the air control plate (5) moves to deform the first spring (7) to store elastic potential energy. When the air control plate (5) moves, the steam is discharged into the recovery pipe (2) through the air flow groove (8), thereby heating the water in the recovery box (1) and realizing the waste heat recovery of the steam. S2: During operation, when the performance of the filter plate (4) for filtering steam is attenuated, resulting in a decrease in gas flow, the first spring (7) releases elastic potential energy to push the air control plate (5) to move to one side of the filter plate (4) to reset. The movement of the air control plate (5) drives the movement of the third connecting plate (17), causing the third connecting plate (17) to move to one side of the limit block (19). When the third connecting plate (17) contacts the limit block (19), the limit block (19) is forced to move upward, causing one end of the limit block (19) to slide out of the limit groove (18). At this time, the third spring (22) releases elastic potential energy to move the fixed plate (25). The fixed plate (25) ) moves the second connecting plate (16) to the side away from the third connecting plate (17), the movement of the second connecting plate (16) drives the slider (14) to slide on the inner wall of the slide groove (15), and the first rack plate (11) moves through the arc guide of the slide groove (15), the first rack plate (11) moves through the first gear (12) to drive the other first rack plate (11) to move, the movement of the first rack plate (11) drives the movement of the first connecting plate (10), the movement of the first connecting plate (10) drives the movement of the control plate (9), so that the two control plates (9) move up and down to alternate positions, switching the filtering channel; S3: When the control panel (9) moves upward to close the air outlet, the slide bar (23) slides out of the top of the filter box (3), making it easier for the staff to watch. The staff can directly pull out the filter plate (4) through the handle (24) and replace it without stopping the machine. The operation is simple and convenient.

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