Multi-stage purification device for wastewater treatment

Abstract

The invention relates to the technical field of wastewater treatment, and discloses a multistage purification device for wastewater treatment, which comprises a first filter cartridge and the like, the first filter cartridge comprises a first filter frame and a fixed partition plate, the fixed partition plate is fixedly connected into the first filter cartridge, the interior of the first filter cartridge is divided into a left cavity and a right cavity by the fixed partition plate, and a first purified water outlet and a wastewater inlet are formed in the first filter cartridge; and the wastewater inlet and the first purified water outlet are respectively communicated with different chambers of the first filter cartridge. The limitation that a traditional fixed filter bed needs to be shut down to replace a filter material is solved, adsorption and backwashing procedures can be synchronously carried out, filtration-backwashing-switching is automatically carried out through mechanical linkage, and compared with traditional equipment, a large amount of shut-down time is saved, so that the wastewater treatment efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and particularly to a multi-stage purification device for wastewater treatment. Background Art

[0002] In recent years, with the increasing demand for the treatment of complex water bodies such as industrial wastewater and domestic wastewater, the activated carbon adsorption technology has been widely used in the field of water treatment due to its high-efficient pollutant removal ability. With its developed pore structure and large specific surface area, activated carbon can effectively adsorb organic pollutants, heavy metal ions and some refractory substances, and is often integrated as a deep treatment unit into a multi-stage purification system.

[0003] The existing activated carbon filtration technology usually adopts the method of combining single-layer activated carbon with quartz sand for filtration. When the activated carbon is saturated after filtration for a period of time, it is necessary to stop the machine to replace the filter material or backwash the activated carbon with clean water, resulting in the difficulty of the equipment to continuously purify wastewater, reducing the purification efficiency, and there may be a large fluctuation in water quality during the process of treating wastewater. The sudden increase in the pollutant concentration in the wastewater may cause the activated carbon to be quickly saturated, resulting in the wastewater that does not meet the water quality standard entering the next process and polluting the wastewater with qualified water quality. Therefore, there is an urgent need for a multi-stage purification device that can continuously purify wastewater and adapt to water quality fluctuations. Summary of the Invention

[0004] The present invention provides a multi-stage purification device for wastewater treatment, which can continuously purify wastewater and adapt to water quality fluctuations, so as to solve the technical problems that it is difficult to continuously filter when using single-layer activated carbon and the filtration effect on wastewater with large fluctuations in pollutant concentration is poor.

[0005] Technical Solution: A multi-stage purification device for wastewater treatment includes a first filter cylinder, the first filter cylinder includes a first filter frame and a fixed partition board, the fixed partition board is fixedly connected inside the first filter cylinder, the fixed partition board divides the interior of the first filter cylinder into two chambers on the left and right, a first purified water discharge port and a wastewater inlet are opened on the first filter cylinder, the wastewater inlet and the first purified water discharge port communicate with different chambers of the first filter cylinder, the first filter frame is rotatably connected to the fixed partition board, and the filter surface switching mechanism is installed outside the first filter cylinder.

[0006] Preferably, it further includes a second filter cylinder, a second filter frame, a second purified water discharge port and a valve, the second filter cylinder is fixedly connected to the first filter cylinder, the second filter frame is installed inside the second filter cylinder, the valve is installed inside the second filter cylinder, and the second purified water discharge port is installed on the second filter cylinder.

[0007] Preferably, the valve is a ball valve.

[0008] Preferably, the filtering substances filled in the first filter frame and the second filter frame are activated carbon.

[0009] Preferably, the filter surface switching mechanism includes a filtering chamber, a control motor, a driving rotating shaft and a filtering passage switching component. There are two left and right filtering chambers separately provided in the first filter frame. The control motor is installed outside the first filter cylinder. The driving rotating shaft passes through the first filter cylinder and is rotationally connected in the fixed partition plate. The output shaft of the control motor is fixedly connected to the driving rotating shaft, and the driving rotating shaft is fixedly connected to the first filter frame.

[0010] Preferably, the filtering passage switching component includes a driving gear, a transmission shaft, a driven gear, a bevel gear transmission group and a downward pressing and rotating component. The driving gear is fixedly connected to the driving rotating shaft. The transmission shaft is rotationally connected outside the first filter cylinder and the second filter cylinder. The driven gear is fixedly connected to one end of the transmission shaft close to the driving gear. The driven gear meshes with the driving gear. The transmission shaft and the valve are connected through the bevel gear transmission group. The downward pressing and rotating component is installed outside the first filter cylinder and the second filter cylinder. The downward pressing and rotating component controls the opening and closing of the right filtering chamber in the first filter cylinder.

[0011] Preferably, the downward pressing and rotating component includes a rotating downward pressing block, a wedge-shaped sliding block, a rotating block, a rotating partition plate and a connecting shaft. The rotating downward pressing block is fixedly connected to the transmission shaft. The wedge-shaped sliding block is slidably connected outside the first filter cylinder and the second filter cylinder. The connecting shaft is rotationally connected in the second filter cylinder. The rotating partition plate is fixedly connected to the connecting shaft. The top of the connecting shaft passes through the second filter cylinder. The rotating block is fixedly connected to the connecting shaft. The rotating block cooperates with the wedge-shaped sliding block.

[0012] Preferably, the tooth number ratio of the driven gear to the driving gear is 3:2. Each time the control motor only drives the driving gear to rotate 180 degrees, and the driven gear is driven by the driving gear to rotate 120 degrees.

[0013] Preferably, it further includes a purified water passage for backwashing the activated carbon in the filter cylinder. The purified water passage includes a first purified water inlet, a first washing wastewater discharge outlet, a second purified water inlet and a second washing wastewater discharge outlet. The first purified water inlet and the first washing wastewater discharge outlet are opened outside the first filter cylinder. The first purified water inlet and the first washing wastewater discharge outlet are both communicated with the chamber on the right side in the first filter cylinder. The second purified water inlet and the second washing wastewater discharge outlet are opened outside the second filter cylinder.

[0014] Preferably, it also includes a downward pressing link, a swing link, a torsion spring and a sliding blocking block, the downward pressing link is fixedly connected to the outside of the wedge-shaped slider, the swing link is rotatably connected to the bottom of the first filter cartridge, the torsion spring connects the swing link and the first filter cartridge, the sliding blocking block is fixedly connected to both ends of the swing link, and the sliding blocking block is slidably connected to the bottom of the first filter cartridge and the second filter cartridge.

[0015] The beneficial effects are: 1. When the activated carbon in the left filter chamber of the first filter frame in the first filter cartridge is saturated, the control motor drives the filter frame to rotate so that the clean filter material is switched to the working position (the left chamber of the first filter cartridge), and the saturated filter material is transferred to the flushing position (the right chamber of the first filter cartridge), which solves the limitation that the traditional fixed filter bed needs to be shut down to replace the filter material, so that the adsorption and backwashing processes can be carried out simultaneously, and the filtration-backwashing-switching automation is realized through mechanical linkage, which saves a lot of downtime compared with traditional equipment, thereby greatly improving the wastewater treatment efficiency.

[0016] 2. The present invention uses a double-layer activated carbon filter layer. The wastewater first passes through the left chamber of the first filter cartridge for a filtration to intercept most of the pollutants in the wastewater, and then enters the right chamber of the first filter cartridge or the second filter cartridge for a secondary filtration to adsorb small molecular pollutants that have not been removed during the primary filtration process to improve the filtration effect. When the concentration of pollutants in the wastewater suddenly increases, compared with the single-layer filtration system, the double-layer filtration system can more stably remove pollutants in the wastewater and ensure the quality of the effluent.

[0017] 3. The present invention uses the mechanical linkage of the driving gear-transmission shaft-bevel gear to accurately control the fluid path. The mechanical linkage setting enables the filter channel switching to be synchronized with the filter material, and compared with the solenoid valve control, it greatly reduces the overall energy consumption. The integrated design of the rotating filter hole and the valve linkage reduces the footprint of the equipment.

[0018] 4. Each rotation of the ball valve corresponds to three rotation switches of the first filter frame, forming an automatic filtering and cleaning process of filtering-backwashing-filtering, which can enable the filtering system in this device to always maintain the best adsorption efficiency.

[0019] 5. When the filter material saturated with adsorption is transferred into the right chamber of the first filter cartridge, the rotating pressing block pushes the wedge-shaped slider downward, and the first washing wastewater outlet is opened in linkage. At this time, clean water is injected from the first clean water inlet and the saturated filter material is backwashed. The wedge-shaped slider moves downward and drives the rotating block to rotate, thereby driving the rotating partition to close the right chamber inlet of the first filter cartridge to ensure that the flushing wastewater is completely isolated from the treated clean water, avoid the backflow of the flushing wastewater, and ensure the water quality of the outlet water. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram on the right side of the present invention.

[0021] Figure 2 This is a schematic structural diagram of the waste water inlet and the first purified water discharge outlet on the first filter cartridge of the present invention.

[0022] Figure 3 This is a schematic structural diagram of the interior of the first filter cartridge of the present invention.

[0023] Figure 4 This is a schematic structural diagram of the first filter frame and the driving rotating shaft of the present invention.

[0024] Figure 5 This is a schematic sectional view of the second filter cartridge of the present invention.

[0025] Figure 6 This is a schematic structural diagram of the rotating pressing block of the present invention.

[0026] Figure 7 This is an exploded view of the structure at the wedge-shaped slider of the present invention.

[0027] Figure 8 This is a schematic structural diagram of the swing rod of the present invention.

[0028] In the figure, the markings are: 1. First filter cartridge, 101. Waste water inlet, 102. First purified water discharge outlet, 103. First filter frame, 1031. Filter chamber, 104. Fixed partition, 105. Control motor, 106. Driving gear, 107. Driving rotating shaft, 108. First purified water inlet, 109. First washing waste water discharge outlet, 2. Second filter cartridge, 201. Second filter frame, 202. Second purified water discharge outlet, 203. Second purified water inlet, 204. Second washing waste water discharge outlet, 205. Valve, 3. Transmission shaft, 301. Transmission gear, 302. Bevel gear transmission group, 303. Rotating pressing block, 4. Wedge-shaped slider, 401. Rotating block, 402. Pressing connecting rod, 403. Rotating partition, 404. Connecting shaft, 5. Swing rod, 501. Torsion spring, 502. Sliding sealing block. Detailed implementation manners

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0030] Embodiment 1: A multi-stage purification device for waste water treatment, as Figures 1 - 8As shown in the figure, it includes a first filter cartridge 1. The first filter cartridge 1 includes a first filter frame 103 and a fixed partition 104. The fixed partition 104 is fixedly connected inside the first filter cartridge 1. The fixed partition 104 divides the interior of the first filter cartridge 1 into two chambers on the left and right. A first purified water discharge port 102 and a wastewater inlet 101 are provided on the first filter cartridge 1. The wastewater inlet 101 and the first purified water discharge port 102 are respectively communicated with different chambers of the first filter cartridge 1. The chamber of the first filter cartridge 1 communicated with the wastewater inlet 101 is on the left, and the chamber of the first filter cartridge 1 communicated with the first purified water discharge port 102 is on the right. The first filter frame 103 is rotatably connected to the fixed partition 104. The first filter frame 103 filters the wastewater entering the first filter cartridge 1. The filter surface switching mechanism is installed outside the first filter cartridge 1.

[0031] As Figure 1 and Figure 5 shown in the figure, it further includes a second filter cartridge 2, a second filter frame 201, a second purified water discharge port 202 and a valve 205. The second filter cartridge 2 is fixedly connected to the first filter cartridge 1. The second filter frame 201 is installed inside the second filter cartridge 2. The filtering substances filled in the first filter frame 103 and the second filter frame 201 are activated carbon. The valve 205 is installed inside the second filter cartridge 2. The valve 205 separates the first filter cartridge 1 from the second filter cartridge 2. The valve 205 is a ball valve. The second purified water discharge port 202 is installed on the second filter cartridge 2.

[0032] As Figures 3 - 7 shown in the figure, the filter surface switching mechanism includes a filtering chamber 1031, a control motor 105, a driving rotating shaft 107 and a filtering passage switching component. Two filtering chambers 1031 are respectively provided on the left and right inside the first filter frame 103. The control motor 105 is installed outside the first filter cartridge 1. The driving rotating shaft 107 passes through the first filter cartridge 1 and is rotatably connected inside the fixed partition 104. The output shaft of the control motor 105 is fixedly connected to the driving rotating shaft 107. The driving rotating shaft 107 is fixedly connected to the first filter frame 103. The control motor 105 drives the first filter frame 103 to rotate through the driving rotating shaft 107.

[0033] As Figure 3 and Figures 5 - 7As shown in the figure. The filtration path switching component includes a driving gear 106, a transmission shaft 3, a transmission gear 301, a bevel gear transmission group 302, and a pressing and rotating component. The driving gear 106 is fixedly connected to the driving rotating shaft 107. The driving gear 106 rotates with the driving rotating shaft 107. The transmission shaft 3 is rotatably connected outside the first filter cartridge 1 and the second filter cartridge 2. The transmission gear 301 is fixedly connected to one end of the transmission shaft 3 close to the driving gear 106. The transmission gear 301 meshes with the driving gear 106. The tooth number ratio of the transmission gear 301 to the driving gear 106 is 3:2. The control motor 105 only drives the driving gear 106 to rotate 180 degrees each time. The transmission gear 301 is driven by the driving gear 106 to rotate 120 degrees. The transmission shaft 3 and the valve 205 are connected through the bevel gear transmission group 302. The transmission shaft 3 drives the valve 205 to rotate through the bevel gear transmission group 302. The pressing and rotating component is installed outside the first filter cartridge 1 and the second filter cartridge 2. The pressing and rotating component controls the opening and closing of the right filter chamber 1031 in the first filter cartridge 1.

[0034] As Figures 5 - 7 shown, the pressing and rotating component includes a rotating pressing block 303, a wedge-shaped slider 4, a rotating block 401, a rotating partition 403, and a connecting shaft 404. The rotating pressing block 303 is fixedly connected to the transmission shaft 3. The rotating pressing block 303 rotates with the transmission shaft 3. The wedge-shaped slider 4 is slidably connected outside the first filter cartridge 1 and the second filter cartridge 2. The rotating pressing block 303 can push the wedge-shaped slider 4 to slide downward during rotation. The connecting shaft 404 is rotatably connected inside the second filter cartridge 2. The rotating partition 403 is fixedly connected to the connecting shaft 404. The top of the connecting shaft 404 passes through the second filter cartridge 2. The rotating block 401 is fixedly connected to the connecting shaft 404. The rotating block 401 cooperates with the wedge-shaped slider 4. When the wedge-shaped slider 4 descends, it can drive the rotating block 401 to rotate.

[0035] The first clean water discharge port 102 and the second clean water discharge port 202 are communicated with other storage devices. During use, wastewater is injected into the first filter cartridge 1 from the wastewater inlet 101. At this time, the valve 205 is in a closed state. The wastewater flows from the left chamber of the first filter cartridge 1 to the right chamber, and finally is discharged out from the first clean water discharge port 102. When the wastewater passes through the first filter frame 103 from the left chamber of the first filter cartridge 1, the activated carbon in the left filter chamber 1031 of the first filter frame 103 adsorbs and filters the sundries in the wastewater. After the filtered clean water enters the right chamber in the first filter cartridge 1, the clean water passes through the right filter chamber 1031 of the first filter frame 103 and then flows out from the first clean water discharge port 102. And because the wastewater has been treated by activated carbon, most of the sundries inside have been removed. When it passes through the first filter frame 103 again, the amount of sundries inside is extremely small, and the activated carbon in the right filter chamber 1031 of the first filter frame 103 is relatively clean.

[0036] When the activated carbon in the filtration chamber 1031 on the left side of the first filter frame 103 is saturated with adsorption, the control motor 105 is started. The control motor 105 drives the first filter frame 103 to rotate 180 degrees through the driving rotating shaft 107. At this time, the activated carbon adsorbed with sundries on the left side of the first filter frame 103 will rotate to the chamber on the right side of the first filter cylinder 1, and the clean activated carbon on the right side of the first filter frame 103 rotates to the chamber on the left side of the first filter cylinder 1 to replace the saturated activated carbon. During this process, the driving gear 106 will drive the transmission gear 301 to rotate 120 degrees. The transmission gear 301 drives the valve 205 to rotate 120 degrees through the transmission shaft 3 and the bevel gear transmission group 302. When the valve 205 rotates 120 degrees, the passage between the first filter cylinder 1 and the second filter cylinder 2 is opened. And during the 120-degree rotation of the transmission shaft 3, the rotary pressing block 303 will push the wedge-shaped slider 4 to descend. During the descent of the wedge-shaped slider 4, it will contact the rotary block 401. And as the wedge-shaped slider 4 continuously descends, the rotary block 401 is pushed by the wedge-shaped slider 4 to rotate, thereby driving the connecting shaft 404 and the rotating partition 403 to rotate. When the rotary pressing block 303 rotates 120 degrees along with the transmission shaft 3, the wedge-shaped slider 4 just pushes the rotary block 401 to rotate 90 degrees, and the connecting shaft 404 and the rotating partition 403 rotate 90 degrees accordingly. After the rotating partition 403 rotates 90 degrees, it will close the inlet of the chamber on the right side of the first filter cylinder 1. At this time, the wastewater enters the first filter cylinder 1 and is filtered by the first filter frame 103, and then flows into the second filter cylinder 2 from the first filter cylinder 1. During the flow of the water flow in the second filter cylinder 2, it passes through the second filter frame 201 again and flows out from the second clean water discharge port 202.

[0037] Embodiment 2: On the basis of Embodiment 1, as Figure 5 and Figure 8 shown, it further includes a clean water passage for backwashing the activated carbon in the filter cylinder. The clean water passage includes a first clean water inlet 108, a first washing wastewater discharge port 109, a second clean water inlet 203 and a second washing wastewater discharge port 204. The first clean water inlet 108 and the first washing wastewater discharge port 109 are opened outside the first filter cylinder 1. Both the first clean water inlet 108 and the first washing wastewater discharge port 109 are communicated with the chamber on the right side inside the first filter cylinder 1. The second clean water inlet 203 and the second washing wastewater discharge port 204 are opened outside the second filter cylinder 2. After the clean water flows into the filter cylinder through the clean water inlet, it will backwash the activated carbon in the filter frame inside it, and the washing wastewater flows out from the washing wastewater discharge port on the filter cylinder.

[0038] As Figure 6 and Figure 8As shown, it further includes a downward pressing link 402, a swing rod 5, a torsion spring 501 and a sliding plugging block 502. The downward pressing link 402 is fixedly connected outside the wedge-shaped slider 4. The swing rod 5 is rotatably connected to the bottom of the first filter cartridge 1. The torsion spring 501 connects the swing rod 5 and the first filter cartridge 1. The sliding plugging block 502 is fixedly connected to both ends of the swing rod 5. There are two sliding plugging blocks 502. The two sliding plugging blocks 502 are respectively slidably connected to the bottoms of the first filter cartridge 1 and the second filter cartridge 2. The sliding plugging block 502 can block the wastewater discharge ports on the corresponding sides.

[0039] When the control motor 105 drives the first filter frame 103 to rotate 180 degrees for the first time, the dirtier activated carbon on the left side of the first filter frame 103 will rotate into the right chamber of the first filter cylinder 1. The first filter cylinder 1 is communicated with the second filter cylinder 2. The inlet of the right chamber of the first filter cylinder 1 is closed by the rotating partition plate 403. At this time, the second clean water inlet 203 is closed. During the downward movement of the wedge-shaped slider 4, it will push the swing rod 5 to swing downward at the end close to the first filter cylinder 1 through the downward pressure link 402. The end of the swing rod 5 close to the second filter cylinder 2 swings upward. The second washing wastewater discharge port 204 at the bottom of the second filter cylinder 2 is blocked by the sliding plug block 502. The sliding plug block 502 in the first washing wastewater discharge port 109 at the bottom of the first filter cylinder 1 is disengaged downward, and the first washing wastewater discharge port 109 is opened. At this time, the first clean water discharge port 102 is closed. Subsequently, clean water is injected into the right chamber in the first filter cylinder 1 from the first clean water inlet 108. The clean water will pass through the dirtier activated carbon in the first filter frame 103 and perform backwashing on it. The washed washing wastewater will be discharged downward from the first washing wastewater discharge port 109. After washing, the water injection is stopped. When the activated carbon in the left chamber of the first filter cylinder 1 adsorbed by the first filter frame 103 is saturated, the control motor 105 drives the first filter frame 103 to rotate 180 degrees again through the driving rotating shaft 107. The activated carbon in the filter chamber 1031 on the dirtier side in the first filter frame 103 rotates into the right chamber of the first filter cylinder 1, and the activated carbon in the filter chamber 1031 that has been backwashed in the first filter frame 103 rotates into the left chamber of the first filter cylinder 1. At this time, the driving gear 106 drives the transmission gear 301 and the transmission shaft 3 to rotate 120 degrees again. During the process of the rotating pressing block 303 rotating 120 degrees again with the transmission shaft 3, it always maintains the state of pressing the wedge-shaped slider 4. The rotating partition plate 403 maintains the state of blocking the right chamber of the first filter cylinder 1. The swing rod 5 still swings downward at the end close to the first filter cylinder 1. The transmission shaft 3 drives the ball valve to rotate 120 degrees again through the bevel gear transmission group 302. At this time, the first filter cylinder 1 and the second filter cylinder 2 still remain communicated. The wastewater flows into the second filter cylinder 2 after passing through the clean activated carbon that has been backwashed in the first filter frame 103. The water passes through the second filter frame 201 for secondary filtration and then flows out from the second clean water discharge port 202;Inject purified water into the first filter cartridge 1 from the first purified water inlet 108. The purified water performs backwashing on the activated carbon adsorbed with impurities in the first filter frame 103 that has rotated into the right chamber of the first filter cartridge 1. The washing wastewater is discharged downward from the first washing wastewater discharge port 109. After the backwashing is completed, close the first purified water inlet 108. When the activated carbon in the left chamber of the first filter cartridge 1 in the first filter frame 103 is saturated with adsorption again, control the motor 105 to control the driving shaft 107 to drive the first filter frame 103 to rotate 180 degrees for the third time. At the same time, disconnect the first purified water discharge port 102 from the external water storage device. At this time, the transmission gear 301 is driven to rotate 120 degrees again. The three rotations of the transmission gear 301 total 360 degrees. The transmission shaft 3 drives the valve 205 to rotate 360 degrees through the bevel gear transmission group 302. The first filter cartridge 1 and the second filter cartridge 2 are no longer connected. At this time, the rotating pressing block 303 also rotates 360 degrees with the transmission shaft 3. The rotating pressing block 303 is disengaged from the wedge-shaped slider 4. At this time, the wedge-shaped slider 4 no longer receives the downward pressure, and the torsion spring 501 will drive the swing rod 5 to swing back to its original position. At this time, the end of the swing rod 5 close to the first filter cartridge 1 swings upward to reset. The first washing wastewater discharge port 109 at the bottom of the first filter cartridge 1 is sealed by the sliding plugging block 502. The sliding plugging block 502 in the second washing wastewater discharge port 204 at the bottom of the second filter cartridge 2 is disengaged downward. The downward pressing connecting rod 402 is pushed upward by the swing rod 5, and the wedge-shaped slider 4 slides upward to reset accordingly. At this time, under the impact of the water flow, the rotating partition plate 403 is rotated back to its original position by the water flow impact. Driven by the connecting shaft 404, the rotating block 401 rotates and returns to its original state. At this time, after the wastewater enters the first filter cartridge 1, it first passes through the activated carbon that has been backwashed clean in the first filter frame 103 for filtration. The filtered water flows into the chamber on the right side of the first filter cartridge 1. The filtered water will first perform backwashing on the dirtier activated carbon in the first filter frame 103 at this time. The backwashed water is discharged outward from the first purified water discharge port 102. When the water flow discharged from the first purified water discharge port 102 becomes clear, connect the first purified water discharge port 102 to the external water storage device again; when backwashing the second filter frame 201 in the second filter cartridge 2, inject purified water into the second filter cartridge 2 from the second purified water inlet 203. Subsequently, the purified water performs backwashing on the activated carbon in the second filter frame 201. The washing wastewater is discharged outward from the second washing wastewater discharge port 204. After the backwashing is completed, close the second purified water inlet 203; control the motor 105 to drive the first filter frame 103 to rotate 3 times as a cycle. During this process, the wastewater can be continuously filtered and purified, and the activated carbon can also be backwashed during the filtration process, realizing the function of continuously filtering wastewater and being able to clean the activated carbon without stopping the machine.;

[0040] Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art from this disclosure that various changes or modifications can be made to the present invention without departing from the principles and spirit scope defined by the claims. Therefore, the detailed description of the embodiments of this disclosure is only for explanation and not for limiting the present invention, but the scope of protection is defined by the content of the claims.

Claims

1. A multi-stage purification device for wastewater treatment, characterized in that: The invention comprises a first filter cartridge (1), wherein the first filter cartridge (1) comprises a first filter frame (103) and a fixed partition (104), wherein the fixed partition (104) is fixedly connected to the first filter cartridge (1), and the fixed partition (104) divides the interior of the first filter cartridge (1) into two left and right chambers, wherein the first filter cartridge (1) is provided with a first clean water outlet (102) and a waste water inlet (101), wherein the waste water inlet (101) and the first clean water outlet (102) are connected to different chambers of the first filter cartridge (1), wherein the first filter frame (103) is rotatably connected to the fixed partition (104), and wherein the filter surface switching mechanism is installed outside the first filter cartridge (1).

2. A multi-stage purification device for wastewater treatment according to claim 1, characterized in that: The invention also comprises a second filter cartridge (2), a second filter frame (201), a second clean water outlet (202) and a valve (205); the second filter cartridge (2) is fixedly connected to the first filter cartridge (1); the second filter frame (201) is installed in the second filter cartridge (2); the valve (205) is installed in the second filter cartridge (2); and the second clean water outlet (202) is installed on the second filter cartridge (2).

3. A multi-stage purification device for wastewater treatment according to claim 2, characterized in that: The valve (205) is a ball valve.

4. A multi-stage purification device for wastewater treatment according to claim 2, characterized in that: The filter material filled in the first filter frame (103) and the second filter frame (201) is activated carbon.

5. A multi-stage purification device for wastewater treatment according to claim 1, characterized in that: The filter surface switching mechanism comprises a filter chamber (1031), a control motor (105), a driving shaft (107) and a filter passage replacement component; the first filter frame (103) is provided with two left and right filter chambers (1031); the control motor (105) is installed outside the first filter cartridge (1); the driving shaft (107) passes through the first filter cartridge (1) and is rotatably connected in the fixed partition (104); the output shaft of the control motor (105) is fixedly connected to the driving shaft (107); and the driving shaft (107) is fixedly connected to the first filter frame (103).

6. A multi-stage purification device for wastewater treatment according to claim 5, characterized in that: The filter passage replacement component comprises a driving gear (106), a transmission shaft (3), a transmission gear (301), a bevel gear transmission group (302) and a downward pressure rotating component, wherein the driving gear (106) is fixedly connected to the driving rotating shaft (107), the transmission shaft (3) is rotatably connected to the outside of the first filter cartridge (1) and the second filter cartridge (2), the transmission gear (301) is fixedly connected to one end of the transmission shaft (3) close to the driving gear (106), the transmission gear (301) is meshed with the driving gear (106), the transmission shaft (3) and the valve (205) are connected through the bevel gear transmission group (302), and the downward pressure rotating component is installed outside the first filter cartridge (1) and the second filter cartridge (2), and the downward pressure rotating component controls the opening and closing of the right filter chamber (1031) in the first filter cartridge (1).

7. A multi-stage purification device for wastewater treatment according to claim 6, characterized in that: The downward pressure rotating assembly includes a rotating downward pressure block (303), a wedge-shaped slider (4), a rotating block (401), a rotating partition (403) and a connecting shaft (404), wherein the rotating downward pressure block (303) is fixedly connected to the transmission shaft (3), the wedge-shaped slider (4) is slidably connected to the outside of the first filter cylinder (1) and the second filter cylinder (2), the connecting shaft (404) is rotationally connected inside the second filter cylinder (2), the rotating partition (403) is fixedly connected to the connecting shaft (404), the top of the connecting shaft (404) passes through the second filter cylinder (2), the rotating block (401) is fixedly connected to the connecting shaft (404), and the rotating block (401) cooperates with the wedge-shaped slider (4).

8. A multi-stage purification device for wastewater treatment according to claim 6, characterized in that: The gear ratio of the transmission gear (301) to the driving gear (106) is 3 to 2. The control motor (105) only drives the driving gear (106) to rotate 180 degrees each time, and the transmission gear (301) is driven by the driving gear (106) to rotate 120 degrees.

9. A multi-stage purification device for wastewater treatment according to claim 2, characterized in that: The invention also comprises a clean water passage for backwashing the activated carbon in the filter cartridge, the clean water passage comprising a first clean water inlet (108), a first washing wastewater outlet (109), a second clean water inlet (203) and a second washing wastewater outlet (204), the first clean water inlet (108) and the first washing wastewater outlet (109) being arranged outside the first filter cartridge (1), the first clean water inlet (108) and the first washing wastewater outlet (109) both being connected to the chamber on the right side of the first filter cartridge (1), and the second clean water inlet (203) and the second washing wastewater outlet (204) being arranged outside the second filter cartridge (2).

10. A multi-stage purification device for wastewater treatment according to claim 6, characterized in that: It also includes a downward pressing connecting rod (402), a swing rod (5), a torsion spring (501) and a sliding blocking block (502), wherein the downward pressing connecting rod (402) is fixedly connected to the outside of the wedge-shaped sliding block (4), the swing rod (5) is rotatably connected to the bottom of the first filter cartridge (1), the torsion spring (501) connects the swing rod (5) and the first filter cartridge (1), the sliding blocking block (502) is fixedly connected to both ends of the swing rod (5), and the sliding blocking block (502) is slidably connected to the bottom of the first filter cartridge (1) and the second filter cartridge (2).

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