Multi-stage tank type waste gas purification and recovery device

Abstract

The invention relates to the technical field of environmental protection science and technology, in particular to a multi-stage tank type waste gas purification and recovery device which comprises a purification tank, a center shaft is rotationally installed in the center of the side face of the purification tank, the outer end of the center shaft is connected with a plurality of sets of supporting pipes, and the outer ends of the supporting pipes are connected with filter plate assemblies. An air inlet pipe and an air outlet pipe are arranged on the two side faces of the purification tank respectively, the ends, corresponding to the purification tank, of the air inlet pipe and the air outlet pipe are connected and communicated with a plurality of manifolds, the manifolds on the air inlet pipe are provided with electric valves used for controlling opening and closing of a channel, and pipe openings, located in the purification tank, of the manifolds are connected with air guide cylinders. And a back flushing assembly is arranged on the purification tank. Through the arrangement of the filter plate assemblies, when waste gas purification operation is carried out, waste gas can be guided to the corresponding filter plate assemblies according to the types of the waste gas, so that adaptive purification treatment is carried out for different waste gases, and the problem that the purification effect is poor due to the fact that a filter filler is not matched with the type of the waste gas is solved.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection technology, and in particular to a multi-stage tank-type waste gas purification and recovery device. Background Art

[0002] In the process of exhaust gas treatment, filter fillers are needed to capture particulate matter in the exhaust gas and adsorb impurities such as sulfides in the exhaust gas, so as to purify the exhaust gas.

[0003] The existing patent number CN106540496B proposes an exhaust gas purification device that can make the exhaust gas discharged from the direct injection gasoline engine flow evenly into the end face of the sealed honeycomb structure and efficiently remove particulate matter. The exhaust gas purification device comprises a honeycomb catalyst body, a sealed honeycomb structure and a tank body that accommodates the honeycomb catalyst body and the sealed honeycomb structure inside. The sealed honeycomb structure disposed at the downstream side of the honeycomb catalyst body is designed so that the pressure loss of the end face center area of ​​at least one of the second inflow side end face and the second outflow side end face of the second honeycomb substrate is greater than the pressure loss of the end face peripheral area around the end face center area.

[0004] The above-mentioned exhaust gas purification device purifies and filters the exhaust gas by evenly distributing the filter material in the tank body. However, in actual use, when the exhaust gas purification equipment has been used for a certain period, the filter filler in the equipment needs to be replaced. The above-mentioned equipment needs to be shut down during operation, which leads to the problem that the exhaust gas is difficult to handle within a certain period of time. In addition, the filter filler in the equipment is used at a high intensity during use, and its service life is reduced. Moreover, when the use environment is more complicated and there are more types of exhaust gas to be handled, the above-mentioned equipment cannot be adjusted according to the type of exhaust gas without stopping the machine to replace the filter filler, resulting in poor filtering effect.

[0005] For this purpose, a multi-stage tank type waste gas purification and recovery device is proposed. Summary of the invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a multi-stage tank-type exhaust gas purification and recovery device.

[0007] To solve the above technical problems, the present invention provides the following technical solution: A multi-stage tank type waste gas purification and recovery device, including a purification tank. A central shaft is rotatably installed at the center of the side surface of the purification tank. A number of support pipes are connected to the outer end of the central shaft. A filter plate assembly is connected to the outer end of the support pipe. Different filter packings for treating different waste gases are respectively arranged in a number of filter plate assemblies. An air inlet pipe and an air outlet pipe are respectively arranged on both side surfaces of the purification tank. The air inlet pipe is used to connect to the waste gas pipeline, and the air outlet pipe is used to connect to the extraction pipeline. A number of manifolds are connected and communicated at the ends of the air inlet pipe and the air outlet pipe corresponding to the purification tank. The manifolds penetrate through the side surface of the purification tank. An electric valve is installed on the manifold of the air inlet pipe to control the opening and closing of the passage. The number of manifolds is half of the number of groups of support pipes and is staggered with the filter plate assemblies. The pipe orifice of the manifold located inside the purification tank is connected with a gas guide cylinder, and the filter plate assembly at the corresponding position of the gas guide cylinder is corresponding. A sealing assembly is arranged on the purification tank to control the sleeving of the filter plate assembly and the gas guide cylinder at the corresponding position. An anti-blowing assembly is arranged on the purification tank, and the anti-blowing assembly discharges an air flow in the direction opposite to the waste gas inlet direction into the purification tank.

[0008] As a preferred technical solution of the present invention, the filter plate assembly includes a filter cylinder. The filter cylinder is connected to the support pipe. A connecting shaft is connected to the center of the filter cylinder. Threads are provided on the connecting shaft, and side plates are threadedly connected to both ends. A number of packing plates are threadedly connected inside the connecting shaft, and filter packings are filled in the packing plates.

[0009] As a preferred technical solution of the present invention, the sealing assembly includes a ring-shaped cylinder. The ring-shaped cylinder is connected to the outer wall of the filter cylinder. A fluid groove is provided inside the center of the ring-shaped cylinder. Convex character fan-shaped grooves are provided on both side surfaces of the ring-shaped cylinder. Fluid holes communicating with the convex character fan-shaped grooves are provided on the side surface of the fluid groove. An insertion rod is sleeved in the convex character fan-shaped groove. One end of the insertion rod located outside the convex character fan-shaped groove is connected with a sleeve. An annular groove is provided on the surface of the sleeve corresponding to the ring-shaped cylinder and is sleeved with the ring-shaped cylinder. A sealing ring is connected to the outer wall of the sleeve. The outer wall of the sleeve is adapted to the inner wall of the gas guide cylinder. Both ends of the central shaft are connected with a circulation pipe through flange bearings. Through holes communicating with the fluid groove are provided inside the central shaft and on the support pipe. A liquid injection cylinder is connected and communicated with the circulation pipe. A telescopic motor is installed on the liquid injection cylinder. The transmission shaft of the telescopic motor is connected with a piston. The piston is sleeved inside the liquid injection cylinder. Fluid media are filled in the central shaft, the support pipe, the fluid groove, the circulation pipe and the liquid injection cylinder. The number of each group of support pipes is two. The inside of the central shaft is blocked between the two support pipes of each group. A circulation pump is installed on the circulation pipe. A heat sink is installed on one side of the circulation pipe at the air inlet end of the circulation pump.

[0010] As a preferred technical solution of the present invention, the back-blowing assembly includes a heat-insulating cylinder, which is sleeved on the circulation pipe and has a heat sink located inside. A fan is installed on the purification tank, and the exhaust port of the fan is connected and communicated with the heat-insulating cylinder. An air guide ring cylinder is connected inside the purification tank, and a back-blowing pipe is connected and communicated with the air guide ring cylinder. The free end of the back-blowing pipe runs through the purification tank, and the free end of the back-blowing pipe is connected and communicated with the heat-insulating cylinder. The side of the air guide ring cylinder is connected and communicated with a back-blowing plate at a position corresponding to the standby position. A long hole is opened on the bottom surface of the purification tank, and a collection plate is connected in the long hole. A sleeve plate is connected to the outer wall of one end of the central axis outside the purification tank, and a trigger handle is connected to the sleeve plate. A fan-shaped limiting ring is connected to the side of the purification tank, and the trigger handle is inserted in the limiting ring. .

[0011] As a preferred technical solution of the present invention,.

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

[0013] 1. Through the setting of the filter plate assembly, when performing exhaust gas purification operations, the exhaust gas can be directed to the corresponding filter plate assembly according to the type of exhaust gas, so as to perform adaptive purification treatment on different exhaust gases, avoiding the problem of poor purification effect caused by the incompatibility of the filter filler with the exhaust gas type, and avoiding the problem of low efficiency caused by refilling the filter filler. In addition, when the filter filler needs to be replaced, the equipment can be operated without stopping the filter plate assembly at the standby position to ensure the stability of the exhaust gas cleaning system.

[0014] 2. Through the setting of the central axis, the filter plate assemblies in the working position and the standby position can be switched during the filtering cycle, and the particles can be blown away through the back-blowing assembly cycle to allow the particles to settle in the purification tank. This not only facilitates the recovery of the particles, but also cleans the filter plate assembly, prolongs the use cycle of the exhaust gas purification, and increases the service life of the filter plate assembly.

[0015] 3. Through the setting of the manifold, the exhaust gas can be centrally guided to allow the exhaust gas to fully contact the filter plate assembly, avoiding the uneven distribution of particles caused by insufficient contact between the filter filler and the exhaust gas, thereby preventing local blockage of the filter plate assembly and affecting the filtering and purification effect.

[0016] 4. Through the setting of the sealing component, when filtering and purifying the exhaust gas, the filter plate component can be placed on the air guide tube, thereby ensuring the sealing of the exhaust gas during flow and avoiding the problem of reduced treatment effect due to exhaust gas overflow.

[0017] 5. By setting the support pipe, the fluid medium will pass through the fluid groove when circulating, so as to export the heat in the fluid groove, cool the exhaust gas, and prevent the loss of the filter plate assembly due to high temperature.

[0018] 6. Through the setting of the back-blowing component, the pumping airflow is used to pass through the heat sink to exchange heat with the fluid medium in the circulation pipe. The flowing air is used to increase the efficiency of heat exchange, thereby improving the cooling efficiency of the fluid medium. While blowing away the particles on the filter plate assembly, the hot air is used to dry the particles, making it easier to peel off the filter filler. At the same time, the hot air keeps the purification tank dry, making it easier for the particles to settle rather than adhere to the purification tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the front side structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the rear side structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the purification tank of the present invention;

[0022] Figure 4 It is a side structural schematic diagram of the ring-mounted cylinder of the present invention;

[0023] Figure 5 It is a cross-sectional structural schematic diagram of the annular tube of the present invention;

[0024] Figure 6 It is a schematic diagram of the top side structure of the present invention;

[0025] Figure 7 It is a schematic structural diagram of the movable handle of the present invention.

[0026] Among them: 10. Purification tank; 11. Central axis; 12. Support pipe; 13. Inlet pipe; 14. Outlet pipe; 15. Manifold; 16. Air guide cylinder; 17. Electric valve; 18. Filter cartridge; 19. Connecting shaft; 20. Filling plate; 21. Side plate; 22. Ring cylinder; 23. Fluid groove; 24. Embossed fan groove; 25. Insert rod; 26. Sleeve; 27. Circulation pipe; 28. Liquid injection cylinder; 29. ​​Telescopic motor; 30. Piston; 31. Circulation pump; 32. Heat sink; 33. Fan; 34. Insulation cylinder; 35. Backflush pipe; 36. Air guide ring cylinder; 37. Backflush plate; 38. Collection plate; 39. Sleeve plate; 40. Pull handle; 41. Limit ring. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work all fall within the protection scope of the present invention. The experimental methods in the following embodiments are all conventional methods unless otherwise specified. The materials, reagents, etc. used in the following embodiments can be obtained from commercial channels unless otherwise specified.

[0028] Embodiment: As Figures 1-7 shown, a multi-stage tank type waste gas purification and recovery device includes a purification tank 10. A central shaft 11 is rotatably installed at the center of the side surface of the purification tank 10. The outer end of the central shaft 11 is connected with a plurality of groups of support pipes 12. The plurality of groups of support pipes 12 are annularly distributed. The outer end of the support pipe 12 is connected with a filter plate assembly. Filter fillers for treating different waste gases are respectively arranged in the plurality of filter plate assemblies. An air inlet pipe 13 and an air outlet pipe 14 are respectively arranged on both side surfaces of the purification tank 10. The air inlet pipe 13 is used to connect to a waste gas pipeline, and the air outlet pipe 14 is used to connect to an air extraction pipeline. The waste gas pipeline is a pipeline for waste gas transmission, and the air extraction pipeline is a pipeline connected to an air extraction device. Both of them are well-known prior arts and will not be elaborated here. One end of the air inlet pipe 13 and the air outlet pipe 14 corresponding to the purification tank 10 are connected and communicated with a plurality of manifolds 15. The manifolds 15 penetrate through the side surface of the purification tank 10. An electric valve 17 is installed on the manifold 15 of the air inlet pipe 13 to control the opening and closing of the passage. The number of manifolds 15 is half of the number of groups of support pipes 12 and is staggered with the filter plate assemblies. The pipe orifice of the manifold 15 located inside the purification tank 10 is connected with a gas guide cylinder 16. The filter plate assemblies at the corresponding positions of the gas guide cylinder 16 are corresponding. The position corresponding to the centers of the two gas guide cylinders 16 is the working position, and the position on one side of the corresponding gas guide cylinder 16 is the standby position. A sealing assembly for controlling the sleeving of the filter plate assembly and the corresponding gas guide cylinder 16 is arranged on the purification tank 10. A back-blowing assembly is arranged on the purification tank 10. The back-blowing assembly discharges an air flow in the direction opposite to the waste gas inlet direction into the purification tank 10.

[0029] Specifically, the intake pipe 13 and the exhaust pipe 14 are respectively connected to the waste gas pipeline and the suction pipeline. According to the type of waste gas, a filter plate assembly for treating the waste gas is selected, and then the electric valve 17 of the selected filter plate assembly is opened. After the suction device is started, the waste gas first passes through the intake pipe 13, then passes through the corresponding manifold 15 according to the opened electric valve 17, and is filtered and purified through the filter plate assembly. Then the purified waste gas is extracted by the suction device through the exhaust pipe 14, and is either subjected to subsequent treatment or directly discharged. After the waste gas is treated for a certain period or when the filter plate assembly is blocked, etc., the sealing assembly releases the sleeving of the filter plate assembly and the air guide cylinder 16, drives the central shaft 11 to rotate, and the filter plate assembly rotates along with the central shaft 11, so that the filter plate assembly in the working position enters the standby position, and the filter plate assembly in the standby position enters the working position. Then the sealing assembly drives the filter plate assembly in the working position to be sleeved with the air guide cylinder 16, and continues the waste gas filtration and purification work. The backwashing assembly is started at a certain frequency to discharge an air flow in the opposite direction to the waste gas intake direction in the purification tank 10, and the air flow is used to blow off the particulate matter filtered in the filter plate assembly. The particulate matter flows with the air flow and settles into the purification tank 10 when the backwashing assembly stops starting within the frequency range.

[0030] As Figure 5 shown, the filter plate assembly includes a filter cylinder 18. The filter cylinder 18 is connected to the support pipe 12. A connecting shaft 19 is connected to the center of the filter cylinder 18. Threads are provided on the connecting shaft 19, and side plates 21 are threadedly connected to both ends. A plurality of packing plates 20 are threadedly connected inside the connecting shaft 19, and filter packing is filled in the packing plates 20. It should be noted that the filter packing is fixed by components such as a cover plate or steel wire on the side of the packing plate 20, which is a well-known prior art and will not be elaborated here.

[0031] Specifically, by arranging packing plates 20 with different numbers and different filter packings in the filter cylinder 18, corresponding filtration processes are formulated for different types of waste gas, achieving multi-stage filtration while improving the filtration effect.

[0032] As Figure 2 and Figure 6As shown, the sealing assembly includes a circumferential cylinder 22 connected to the outer wall of the filter cartridge 18. A fluid groove 23 is provided inside the center of the circumferential cylinder 22. Two vertically distributed convex-character fan-shaped grooves 24 are provided on both sides of the circumferential cylinder 22. The convex-character fan-shaped groove 24 is a fan-shaped groove with a convex cross-section. A fluid hole communicating with the convex-character fan-shaped groove 24 is provided on the side of the fluid groove 23. A convex-shaped insertion rod 25 is sleeved in the convex-character fan-shaped groove 24. The insertion rod 25 and the convex-character fan-shaped groove 24 are sealed. One end of the insertion rod 25 outside the convex-character fan-shaped groove 24 is connected to a sleeve 26. An annular groove is provided on the side of the sleeve 26 corresponding to the circumferential cylinder 22 and is sleeved with the circumferential cylinder 22. A sealing ring is connected to the outer wall of the sleeve 26. The outer wall of the sleeve 26 is adapted to the inner wall of the air guide cylinder 16. A fillet is provided on the outer edge surface of the sleeve 26. Both ends of the central shaft 11 are connected by flange bearings to a C-shaped circulation pipe 27. Through holes communicating with the fluid groove 23 are provided inside the central shaft 11 and on the support pipe 12. A liquid injection cylinder 28 is connected and communicated with the circulation pipe 27. A telescopic motor 29 is installed on the liquid injection cylinder 28. The transmission shaft of the telescopic motor 29 is connected to a piston 30. The piston 30 is sleeved inside the liquid injection cylinder 28. The central shaft 11, the support pipe 12, the fluid groove 23, the circulation pipe 27, and the liquid injection cylinder 28 are all filled with a fluid medium. It should be noted that the fluid medium is a heat-absorbing fluid, including water. In addition, a spring assembly (not shown in the figure) for resetting is provided between the circumferential cylinder 22 and the sleeve 26.

[0033] Specifically, control the transmission shaft of the telescopic motor 29 to extend. The piston 30 presses out the fluid medium in the liquid injection cylinder 28. The fluid groove 23 injects the fluid medium into the convex-character fan-shaped groove 24 through the fluid hole due to the increase of the fluid medium inside, and pushes the insertion rod 25 to extend. The insertion rod 25 further pushes the sleeve 26 to extend, so that the sleeve 26 is inserted into the air guide cylinder 16, thereby realizing the sealing between the circumferential cylinder 22 and the air guide cylinder 16. When it is necessary to switch the filter plate assembly, control the transmission shaft of the telescopic motor 29 to retract. The circumferential cylinder 22 retracts under the pull of the spring and disengages from the air guide cylinder 16.

[0034] As Figure 5 and Figure 6 shown, the number of each group of support pipes 12 is two. The inside of the central shaft 11 is blocked between the two support pipes 12 in each group. A circulation pump 31 is installed on the circulation pipe 27. A heat sink 32 is installed on one side of the circulation pipe 27 at the intake end of the circulation pump 31.

[0035] Specifically, starting the circulation pipe 27 allows the fluid medium to flow in the central shaft 11 and the circulation pipe 27. The flowing fluid medium enters through one of the support pipes 12 in each group, and then flows out through the other support pipe 12. Therefore, it will pass through the fluid groove 23 to export the heat in the fluid groove 23. When the fluid medium passes through the heat sink 32, it exchanges heat with the outside world to cool itself.

[0036] AsFigure 2 and Figure 3 As shown in Figure 3 , the backflush assembly includes a heat insulation cylinder 34. The heat insulation cylinder 34 is sleeved on the circulation pipe 27 and the heat dissipation fins 32 are located inside. A fan 33 is installed on the purification tank 10. The exhaust port of the fan 33 is connected and communicated with the heat insulation cylinder 34. A wind guiding ring cylinder 36 is connected inside the purification tank 10. A backflush pipe 35 is connected and communicated with the wind guiding ring cylinder 36. The free end of the backflush pipe 35 penetrates through the purification tank 10. The free end of the backflush pipe 35 is connected and communicated with the heat insulation cylinder 34. A backflush plate 37 is connected and communicated with the position corresponding to the standby position on the side of the wind guiding ring cylinder 36.

[0037] Specifically, when the fan 33 is started, it sucks in air outward and discharges it through the backflush pipe 35. When the air passes through the heat dissipation fins 32, it exchanges heat with the fluid medium, using the flowing air to increase the heat exchange efficiency. Then the hot air flow is blown to the filter plate assembly at the standby position through the wind guiding ring cylinder 36 and the backflush plate 37. While blowing the particulate matter on the filter plate assembly to break away, it uses the hot air to dry the particulate matter, making it easier for the particulate matter to peel off from the filter packing. At the same time, the hot air keeps the inside of the purification tank 10 dry, making it easier for the particulate matter to settle rather than adhere to the inside of the purification tank 10.

[0038] As Figure 2 shown, a long strip hole is opened on the bottom surface of the purification tank 10, and a collection tray 38 is connected inside the long strip hole.

[0039] Specifically, the particulate matter settled in the purification tank 10 is collected in the collection tray 38 for convenient collection and recovery of the particulate matter.

[0040] As Figure 7 shown, a sleeve plate 39 is connected to the outer wall of one end of the central shaft 11 located outside the purification tank 10. A pulling handle 40 is connected to the sleeve plate 39. A fan-shaped limiting ring 41 is connected to the side of the purification tank 10. The pulling handle 40 is inserted into the limiting ring 41. The inner wall of the limiting ring 41 is at a certain angle, and the specific angle is 360° divided by the number of filter plate assemblies.

[0041] Specifically, by pulling the pulling handle 40, the central shaft 11 can be driven to rotate, thereby completing the switching of the filter plate assembly between the working position and the standby position. The setting of the limiting ring 41 limits the rotation angle of the central shaft 11 to make the rotation angle of the central shaft 11 adapt to the position switching of the filter plate assembly.

[0042] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to this. Within the scope of knowledge possessed by those skilled in the art to which the present invention pertains, various changes can be made without departing from the gist of the present invention.

Claims

1. A multi-stage tank type exhaust gas purification and recovery device, comprising a purification tank (10), characterized in that: A central shaft (11) is rotatably mounted at the center of the side of the purification tank (10), and the outer end of the central shaft (11) is connected to a plurality of groups of support pipes (12), and the outer end of the support pipe (12) is connected to a filter plate assembly, and filter fillers for treating different waste gases are respectively arranged in the plurality of filter plate assemblies. An air inlet pipe (13) and an air outlet pipe (14) are respectively arranged on the two sides of the purification tank (10), and the air inlet pipe (13) is used to connect to the waste gas pipeline, and the air outlet pipe (14) is used to connect to the exhaust pipeline. The air inlet pipe (13) and the air outlet pipe (14) are connected to one end of the corresponding purification tank (10) and are in communication with a plurality of manifolds (15), and the manifolds (15) penetrate through On the side of the purification tank (10), a manifold (15) on the air intake pipe (13) is installed with an electric valve (17) for controlling the opening and closing of the passage. The number of manifolds (15) is half the number of groups of support pipes (12) and is staggered with the filter plate assemblies. The pipe opening of the manifold (15) located in the purification tank (10) is connected with an air guide cylinder (16), and the filter plate assemblies at corresponding positions of the air guide cylinder (16) correspond. The purification tank (10) is provided with a sealing assembly for controlling the filter plate assembly to be sleeved with the air guide cylinder (16) at corresponding positions. The purification tank (10) is provided with a backflush assembly, and the backflush assembly discharges an airflow in the opposite direction of the exhaust gas intake direction into the purification tank (10).

2. A multi-stage tank type exhaust gas purification and recovery device according to claim 1, characterized in that: The filter plate assembly comprises a filter cartridge (18), the filter cartridge (18) being connected to a support tube (12), a connecting shaft (19) being connected at the center of the filter cartridge (18), a thread being provided on the connecting shaft (19) and having side plates (21) threadedly connected at both ends, a plurality of filler plates (20) being connected internally to the connecting shaft (19), and the filler plates (20) being filled with filter fillers.

3. A multi-stage tank type exhaust gas purification and recovery device according to claim 2, characterized in that: The sealing assembly comprises an annular tube (22), the annular tube (22) being connected to the outer wall of the filter tube (18), a fluid groove (23) being provided in the center of the annular tube (22), convex fan grooves (24) being provided on both sides of the annular tube (22), a fluid hole being provided on the side of the fluid groove (23) and being communicated with the convex fan groove (24), an insertion rod (25) being sleeved in the convex fan groove (24), an end of the insertion rod (25) being located outside the convex fan groove (24) being connected to a sleeve (26), a side of the sleeve (26) corresponding to the annular tube (22) being provided with an annular groove and being sleeved with the annular tube (22), an outer wall of the sleeve (26) being connected to a sealing ring, and the sleeve (2 The outer wall of the support tube (16) is matched with the inner wall of the air guide cylinder (16), the two ends of the central axis (11) are connected to the circulation tube (27) through flange bearings, the central axis (11) and the support tube (12) are provided with through holes connected to the fluid groove (23), the circulation tube (27) is connected and connected to the injection cylinder (28), the injection cylinder (28) is installed with a telescopic motor (29), the transmission shaft of the telescopic motor (29) is connected to the piston (30), the piston (30) is sleeved inside the injection cylinder (28), and the central axis (11), the support tube (12), the fluid groove (23), the circulation tube (27) and the injection cylinder (28) are all filled with fluid medium.

4. A multi-stage tank type exhaust gas purification and recovery device according to claim 3, characterized in that: The number of the support tubes (12) in each group is two, the interior of the central axis (11) is sealed between the two support tubes (12) in each group, a circulation pump (31) is installed on the circulation tube (27), and a heat sink (32) is installed on one side of the air inlet end of the circulation pump (31) of the circulation tube (27).

5. A multi-stage tank type exhaust gas purification and recovery device according to claim 4, characterized in that: The back-blowing assembly comprises a heat-insulating cylinder (34), the heat-insulating cylinder (34) is sleeved on the circulation pipe (27) and the heat sink (32) is located inside, a fan (33) is installed on the purification tank (10), the exhaust port of the fan (33) is connected to and communicated with the heat-insulating cylinder (34), an air guide ring cylinder (36) is connected inside the purification tank (10), a back-blowing pipe (35) is connected to and communicated with the air guide ring cylinder (36), a free end of the back-blowing pipe (35) passes through the purification tank (10), the free end of the back-blowing pipe (35) is connected to and communicated with the heat-insulating cylinder (34), and a back-blowing disk (37) is connected to and communicated with the side of the air guide ring cylinder (36) corresponding to the standby position.

6. A multi-stage tank type exhaust gas purification and recovery device according to claim 5, characterized in that: The bottom surface of the purification tank (10) is provided with an elongated hole, and a collecting plate (38) is connected inside the elongated hole.

7. The multi-stage tank type exhaust gas purification and recovery device according to claim 5 is characterized in that: The outer wall of one end of the central axis (11) outside the purification tank (10) is connected to a sleeve plate (39), and a lever handle (40) is connected to the sleeve plate (39). A fan-shaped limiting ring (41) is connected to the side of the purification tank (10), and the lever handle (40) is inserted into the limiting ring (41).

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