A multi-stage purification device for wastewater treatment

Abstract

The present invention relates to the field of wastewater treatment technology, and discloses a multi-stage purification device for wastewater treatment, including a first filter cartridge, etc.; the first filter cartridge includes a first filter frame and a fixed partition, the fixed partition is fixedly connected to the first filter cartridge, the fixed partition divides the interior of the first filter cartridge into two left and right chambers, the first filter cartridge is provided with a first clean water outlet and a wastewater inlet, the wastewater inlet and the first clean water outlet are respectively connected to different chambers of the first filter cartridge. The present invention solves the limitation of traditional fixed filter beds requiring shutdown to replace filter materials, enables the adsorption and backwashing processes to be carried out simultaneously, and realizes the automation of filtration-backwashing-switching through mechanical linkage, saving a lot of downtime compared to traditional equipment, thereby greatly improving wastewater treatment efficiency.

Description

Technical Field

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

[0002] In recent years, with the growing demand for treating complex water bodies such as industrial and domestic wastewater, activated carbon adsorption technology has been widely used in water treatment due to its efficient pollutant removal capabilities. Activated carbon, with its well-developed pore structure and large specific surface area, effectively adsorbs organic pollutants, heavy metal ions, and some difficult-to-degrade substances. It is often integrated into multi-stage purification systems as a deep treatment unit.

[0003] Existing activated carbon filtration technology usually adopts a filtration method combining a single layer of activated carbon and quartz sand. After a period of filtration, when the activated carbon adsorption is saturated, it is necessary to stop the machine to replace the filter material or use clean water to backwash the activated carbon, which makes it difficult for the equipment to continuously purify the wastewater, reduces the purification efficiency, and may cause large fluctuations in water quality during the wastewater treatment process. A sudden increase in the concentration of pollutants in the wastewater may cause the activated carbon to quickly adsorb and saturate, causing wastewater that does not meet the water quality standards to enter the next process, causing pollution to the wastewater with qualified water quality. Therefore, there is an urgent need for a multi-stage purification device that can continuously purify wastewater and can 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 continuous filtration is difficult when using single-layer activated carbon and the filtration effect of wastewater with large fluctuations in pollutant concentration is poor.

[0005] Technical solution: A multi-stage purification device for wastewater treatment includes a first filter cartridge, the first filter cartridge includes a first filter frame and a fixed partition, the fixed partition is fixed in the first filter cartridge, the fixed partition divides the interior of the first filter cartridge into two left and right chambers, the first filter cartridge is provided with a first clean water outlet and a wastewater inlet, the wastewater inlet and the first clean water outlet are connected to different chambers of the first filter cartridge, the first filter frame is rotatably connected to the fixed partition, and the filter surface switching mechanism is installed outside the first filter cartridge.

[0006] Preferably, it also includes a second filter cartridge, a second filter frame, a second clean water outlet and a valve. The second filter cartridge is fixedly connected to the first filter cartridge, the second filter frame is installed in the second filter cartridge, the valve is installed in the second filter cartridge, and the second clean water outlet is installed on the second filter cartridge.

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

[0008] Preferably, the filter material filled in the first filter frame and the second filter frame is activated carbon.

[0009] Preferably, the filter surface switching mechanism includes a filter chamber, a control motor, an active rotating shaft and a filter passage replacement component. The first filter frame is provided with two left and right filter chambers. The control motor is installed outside the first filter cartridge. The active rotating shaft passes through the first filter cartridge and is rotatably connected to the fixed partition. The output shaft of the control motor is fixedly connected to the active rotating shaft, and the active rotating shaft is fixedly connected to the first filter frame.

[0010] Preferably, the filter passage replacement assembly includes a driving gear, a transmission shaft, a transmission gear, a bevel gear transmission group and a downward pressure rotating assembly, the driving gear is fixedly connected to the driving rotating shaft, the transmission shaft is rotatably connected to the outside of the first filter cartridge and the second filter cartridge, the transmission gear is fixed to one end of the transmission shaft close to the driving gear, the transmission gear is meshed with the driving gear, the transmission shaft and the valve are connected through the bevel gear transmission group, the downward pressure rotating assembly is installed outside the first filter cartridge and the second filter cartridge, and the downward pressure rotating assembly controls the opening and closing of the right filter chamber in the first filter cartridge.

[0011] Preferably, the downward pressure rotating assembly includes a rotating downward pressure block, a wedge-shaped slider, a rotating block, a rotating partition and a connecting shaft. The rotating downward pressure block is fixedly connected to the transmission shaft, the wedge-shaped slider is slidably connected to the outside of the first filter cylinder and the second filter cylinder, the connecting shaft is rotatably connected inside the second filter cylinder, the rotating partition 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, and the rotating block cooperates with the wedge-shaped slider.

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

[0013] Preferably, it also includes a clean water passage for backwashing the activated carbon in the filter cartridge, the clean water passage includes a first clean water inlet, a first washing wastewater outlet, a second clean water inlet and a second washing wastewater outlet, the first clean water inlet and the first washing wastewater outlet are opened outside the first filter cartridge, the first clean water inlet and the first washing wastewater outlet are both connected to the chamber on the right side of the first filter cartridge, and the second clean water inlet and the second washing wastewater outlet are opened outside the second filter cartridge.

[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). This solves the limitation of the traditional fixed filter bed that requires shutdown to replace the filter material, so that the adsorption and backwashing processes can be carried out simultaneously, and the filtration-backwashing-switching is automated 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, intercepting 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 were not removed during the primary filtration process, thereby improving 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. This mechanical linkage setting enables the switching of the filter channel and the filter material to be switched synchronously, 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 equipment's footprint.

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

[0019] 5. When the adsorption-saturated filter material 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 conjunction. At this time, clean water is injected from the first clean water inlet and the saturated filter material is backwashed. The wedge slider moves downward and drives the rotating block to rotate, which in turn drives the rotating partition to close the right chamber inlet of the first filter cartridge to ensure that the washing wastewater is completely isolated from the treated clean water, avoid the backflow of the washing 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 wastewater inlet and the first clean water outlet on the first filter cartridge of the present invention.

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

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

[0024] Figure 5 It is a schematic cross-sectional structural diagram 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 of the wedge-shaped slider of the present invention.

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

[0028] Marked in the figure: 1. First filter cartridge, 101. Wastewater inlet, 102. First clean water outlet, 103. First filter frame, 1031. Filter chamber, 104. Fixed partition, 105. Control motor, 106. Driving gear, 107. Driving shaft, 108. First clean water inlet, 109. First washing wastewater outlet, 2. Second filter cartridge, 201. Second filter frame, 202. Second clean water outlet, 203. Second clean water inlet, 204. Second washing wastewater outlet, 205. Valve, 3. Drive shaft, 301. Drive gear, 302. Bevel gear drive group, 303. Rotating pressing block, 4. Wedge slider, 401. Rotating block, 402. Pressing connecting rod, 403. Rotating partition, 404. Connecting shaft, 5. Swinging rod, 501. Torsion spring, 502. Sliding blocking block. DETAILED DESCRIPTION

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

[0030] Example 1: A multi-stage purification device for wastewater treatment, such as Figures 1-8As shown, 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 to the first filter cartridge 1, the fixed partition 104 divides the interior of the first filter cartridge 1 into two left and right chambers, the first filter cartridge 1 is provided with a first clean water outlet 102 and a wastewater inlet 101, the wastewater inlet 101 and the first clean water outlet 102 are respectively connected to different chambers of the first filter cartridge 1, the chamber in which the first filter cartridge 1 is connected to the wastewater inlet 101 is on the left, and the chamber in which the first filter cartridge 1 is connected to the first clean water outlet 102 is on the right, the first filter frame 103 is rotatably connected to the fixed partition 104, the first filter frame 103 will filter the wastewater entering the first filter cartridge 1, and the filter surface switching mechanism is installed outside the first filter cartridge 1.

[0031] like Figure 1 and Figure 5 As shown, it also includes 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, and the second filter frame 201 is installed in the second filter cartridge 2. The filter material filled in the first filter frame 103 and the second filter frame 201 is activated carbon. The valve 205 is installed in 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 clean water outlet 202 is installed on the second filter cartridge 2.

[0032] like Figure 3-Figure 7 As shown, the filter surface switching mechanism includes a filter chamber 1031, a control motor 105, an active rotating shaft 107 and a filter path 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 active rotating shaft 107 passes through the first filter cartridge 1 and is rotatably connected to the fixed partition 104. The output shaft of the control motor 105 is fixedly connected to the active rotating shaft 107, and the active 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 active rotating shaft 107.

[0033] like Figure 3 and Figure 5-Figure 7shown. The filter passage replacement assembly includes a driving gear 106, a transmission shaft 3, a transmission gear 301, a bevel gear transmission group 302 and a downward pressure rotation assembly. 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 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 near the driving gear 106. The transmission gear 301 is meshed with the driving gear 106. 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. The transmission shaft 3 is connected to the valve 205 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 downward pressure rotation assembly is installed outside the first filter cartridge 1 and the second filter cartridge 2. The downward pressure rotation assembly controls the opening and closing of the right filter chamber 1031 in the first filter cartridge 1.

[0034] like Figure 5-Figure 7 As shown, 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. The rotating downward pressure block 303 is fixedly connected to the transmission shaft 3, and the rotating downward pressure block 303 rotates with the transmission shaft 3. The wedge-shaped slider 4 is slidably connected to the outside of the first filter cartridge 1 and the second filter cartridge 2. During the rotation of the rotating downward pressure block 303, the wedge-shaped slider 4 can push the wedge-shaped slider 4 to slide downward. The connecting shaft 404 is rotatably connected to 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 outlet 102 and the second clean water outlet 202 are connected to 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, and the wastewater flows from the left chamber of the first filter cartridge 1 to the right chamber, and finally discharged from the first clean water outlet 102. When the wastewater passes through the first filter frame 103 from the chamber on the left side of the first filter cartridge 1, the activated carbon in the filter chamber 1031 on the left side of the first filter frame 103 adsorbs and filters the impurities in the wastewater. After the filtered clean water enters the right chamber in the first filter cartridge 1, the clean water passes through the filter chamber 1031 on the right side of the first filter frame 103 and flows out from the first clean water outlet 102. Since the wastewater has been treated with activated carbon, most of the impurities inside it have been absorbed. When it passes through the first filter frame 103 again, the amount of impurities inside it is very small, and the activated carbon in the filter chamber 1031 on the right side of the first filter frame 103 is relatively clean.

[0036] When the activated carbon in the filter chamber 1031 on the left side of the first filter frame 103 is saturated with adsorption, the control motor 105 is started, and the control motor 105 will drive the first filter frame 103 to rotate 180 degrees through the active rotating shaft 107. At this time, the activated carbon adsorbed with debris on the left side of the first filter frame 103 will rotate to the chamber on the right side of the first filter cartridge 1, and the clean activated carbon on the right side of the first filter frame 103 will rotate to the chamber on the left side of the first filter cartridge 1 to replace the saturated activated carbon. In this process, the active gear 106 will drive the transmission gear 301 to rotate 120 degrees, and 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 channel between the first filter cartridge 1 and the second filter cartridge 2 is opened, and in the process of the transmission shaft 3 rotating 120 degrees, the valve 205 will rotate 120 degrees. The rotating downward pressing block 303 pushes the wedge-shaped slider 4 to descend. During the descending process, the wedge-shaped slider 4 will contact the rotating block 401, and as the wedge-shaped slider 4 continues to descend, the rotating 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 rotating downward pressing block 303 rotates 120 degrees with the transmission shaft 3, the wedge-shaped slider 4 just pushes the rotating 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, the entrance of the right chamber of the first filter cartridge 1 will be closed. At this time, the wastewater enters the first filter cartridge 1 and is filtered through the first filter frame 103, and then flows from the first filter cartridge 1 into the second filter cartridge 2. During the flow in the second filter cartridge 2, the water passes through the second filter frame 201 again and flows out from the second clean water outlet 202.

[0037] Example 2: Based on Example 1, Figure 5 and Figure 8 As shown, it also includes a clean water passage for backwashing the activated carbon in the filter cartridge, and the clean water passage includes 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 are opened outside the first filter cartridge 1, and the first clean water inlet 108 and the first washing wastewater outlet 109 are both connected to the chamber on the right side of the first filter cartridge 1. The second clean water inlet 203 and the second washing wastewater outlet 204 are opened outside the second filter cartridge 2. After the clean water flows into the filter cartridge through the clean water inlet, the activated carbon in the filter frame inside it will be backwashed, and the flushing wastewater flows out from the washing wastewater outlet on the filter cartridge.

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

[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 to the right chamber of the first filter cartridge 1, and the first filter cartridge 1 is connected to the second filter cartridge 2. The entrance of the right chamber of the first filter cartridge 1 is closed by the rotating partition 403. At this time, the second purified water inlet 203 is closed, and the wedge-shaped slider 4 will push the end of the swing rod 5 close to the first filter cartridge 1 to swing downward by pressing the connecting rod 402 during the descent process, and the end of the swing rod 5 close to the second filter cartridge 2 to swing upward, and the bottom of the second filter cartridge 2 will be The second washing wastewater outlet 204 is blocked by the sliding blocking block 502, and the sliding blocking block 502 in the first washing wastewater outlet 109 at the bottom of the first filter cartridge 1 is dislodged downward, and the first washing wastewater outlet 109 is opened. At this time, the first clean water outlet 102 is closed, and then clean water is injected into the right chamber in the first filter cartridge 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 backwash it. The washed washing wastewater will be discharged downward from the first washing wastewater outlet 109. After washing, stop injecting water. When the first After the activated carbon in the filter frame 103 located in the left chamber of the first filter cartridge 1 is saturated with adsorption, the control motor 105 drives the first filter frame 103 to rotate 180 degrees through the active shaft 107 again. The activated carbon in the filter chamber 1031 on the dirtier side of the first filter frame 103 rotates to the right chamber of the first filter cartridge 1, and the activated carbon in the backwashed filter chamber 1031 in the first filter frame 103 rotates to the left chamber of the first filter cartridge 1. At this time, the active gear 106 drives the transmission gear 301 and the transmission shaft 3 to rotate 120 degrees again, and the rotating lower pressing block 303 rotates with the transmission shaft 3 During the process of rotating 120 degrees again, the wedge-shaped slider 4 is always kept in the state of being pressed, and the rotating partition 403 keeps the right chamber of the first filter cartridge 1 blocked. The swing rod 5 is still close to the end of the first filter cartridge 1 and points downward. 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 cartridge 1 and the second filter cartridge 2 are still connected. The wastewater flows into the second filter cartridge 2 after passing through the clean activated carbon 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 outlet 202.The clean water is injected into the first filter cartridge 1 from the first clean water inlet 108, and the clean water backwashes the activated carbon adsorbed with impurities in the right chamber of the first filter cartridge 1 that rotates in the first filter frame 103, and the washing wastewater is discharged downward from the first washing wastewater outlet 109. After the backwashing is completed, the first clean water inlet 108 is closed. When the activated carbon in the left chamber of the first filter cartridge 1 in the first filter frame 103 is saturated again, the control motor 105 controls the active shaft 107 for the third time to drive the first filter frame 103 to rotate 180 degrees, and at the same time, the first clean water outlet 102 is disconnected from the external water storage device. At this time, the transmission gear 301 is driven to rotate 120 degrees again, and the transmission gear 30 After three rotations totaling 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 lower pressing block 303 also rotates 360 degrees with the transmission shaft 3. The rotating lower pressing block 303 is disengaged from the wedge-shaped slider 4. At this time, the wedge-shaped slider 4 is no longer under downward pressure, and the torsion spring 501 drives 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 and returns to its original position. The first washing wastewater outlet 109 at the bottom of the first filter cartridge 1 is closed by the sliding blocking block 502, and the sliding blocking block 502 in the second washing wastewater outlet 204 at the bottom of the second filter cartridge 2 is closed. 02 is disengaged downward, and the downward-pressing connecting rod 402 is pushed upward by the swing rod 5, and the wedge-shaped slider 4 slides upward and resets. At this time, under the impact of the water flow, the rotating partition 403 is impacted and rotated and reset by the water flow. 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 is first filtered by the backwashed activated carbon in the first filter frame 103. The filtered water flows into the chamber on the right side of the first filter cartridge 1. The filtered water will first backwash the dirtier activated carbon in the first filter frame 103. The backwashed water is discharged from the first clean water outlet 102. When the water discharged from the first clean water outlet 102 becomes clear , then connect the first clean water outlet 102 to an external water storage device; when backwashing the second filter frame 201 in the second filter cartridge 2, clean water is injected into the second filter cartridge 2 from the second clean water inlet 203. The clean water then backwashes the activated carbon in the second filter frame 201, and the washing wastewater is discharged from the second washing wastewater outlet 204. After the backwash is completed, the second clean water inlet 203 is closed; the control motor 105 drives the first filter frame 103 to rotate three times each time as one cycle. During this process, the wastewater can be continuously filtered and purified, and the activated carbon can also be backwashed during the filtration process, achieving the functions of continuously filtering wastewater and cleaning 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 may be made to the present invention without departing from the principles and spirit of the invention as defined in the claims. Therefore, the detailed description of the disclosed embodiments is intended to be illustrative only and not to limit the present invention, which is to be defined by 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, and 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 in communication with different chambers of the first filter cartridge (1), and the first filter frame (103) is rotatably connected to the fixed partition (104), and a filter surface switching mechanism is installed outside the first filter cartridge (1); It also includes a second filter cartridge (2), a second filter frame (201), a second clean water outlet (202) and a valve (205), wherein 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); The filter passage exchange component includes a driving gear (106), a transmission shaft (3), a transmission gear (301), a bevel gear transmission group (302) and a downward pressure rotation component, wherein the driving gear (106) is fixedly connected to the driving rotation shaft (107), the transmission shaft (3) is rotatably connected to the outside of the first filter barrel (1) and the second filter barrel (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), the downward pressure rotation component is installed outside the first filter barrel (1) and the second filter barrel (2), and the downward pressure rotation component controls the opening and closing of the right filter chamber (1031) in the first filter barrel (1); The filter passage exchange component includes a driving gear (106), a transmission shaft (3), a transmission gear (301), a bevel gear transmission group (302) and a downward pressure rotation component, wherein the driving gear (106) is fixedly connected to the driving rotation shaft (107), the transmission shaft (3) is rotatably connected to the outside of the first filter barrel (1) and the second filter barrel (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), the downward pressure rotation component is installed outside the first filter barrel (1) and the second filter barrel (2), and the downward pressure rotation component controls the opening and closing of the right filter chamber (1031) in the first filter barrel (1); 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 fixed on 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 fixed on the connecting shaft (404), the top of the connecting shaft (404) passes through the second filter cylinder (2), the rotating block (401) is fixed to the connecting shaft (404), and the rotating block (401) cooperates with the wedge-shaped slider (4).

2. A multi-stage purification device for wastewater treatment according to claim 1, characterized in that: The valve (205) is a ball valve.

3. A multi-stage purification device for wastewater treatment according to claim 1, characterized in that: The filter material filled in the first filter frame (103) and the second filter frame (201) is activated carbon.

4. A multi-stage purification device for wastewater treatment according to claim 1, 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.

5. A multi-stage purification device for wastewater treatment according to claim 1, characterized in that: The invention also includes a clean water passage for backwashing the activated carbon in the filter cartridge, wherein the clean water passage includes 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), wherein the first clean water inlet (108) and the first washing wastewater outlet (109) are provided outside the first filter cartridge (1), and the first clean water inlet (108) and the first washing wastewater outlet (109) are both 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) are provided outside the second filter cartridge (2).

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