Pre-filter capable of controlling backwashing and pollution discharge at top and control method

Abstract

The invention relates to a pre-filter for top control of backwashing and pollution discharge and a control method, the pre-filter comprises a controller, a valve head body with a water inlet port, a water outlet port and a filter bottle matching port, a driving motor assembly, a control assembly, a transmission assembly, a pollution discharge switching assembly and a backwashing assembly; the driving motor assembly comprises a driving motor, the driving motor is fixed to the valve head body, and the valve head body is provided with an assembling cavity matched with the output end of the driving motor. The control assembly comprises a first limiting switch; the transmission assembly comprises a transmission shaft, the transmission shaft is connected with the output end of the driving motor and is in running fit with the assembling cavity, the pollution discharge switching assembly is arranged at the end of the transmission shaft, and the transmission shaft can axially move under the action of the driving motor. The valve head is more optimized in structure, convenient to install, use and maintain, compact in structure and high in automation degree and reliability, and backwashing, pollution discharge and / or water leakage protection valve closing actions are controlled through one motor.

Description

Technical Field

[0001] The invention relates to a pre-filter for top-controlled backwashing and sewage discharge and a control method thereof, belonging to the technical field of water purification equipment. Background Art

[0002] The prior art pre-filter comprises: a valve head, a filter bottle connected to the valve head at the upper end, a drainage assembly connected to the lower end of the filter bottle, a filter screen frame is arranged in the filter bottle, and a filter screen is sleeved on the outer wall of the filter screen frame. During use, water flows from the water inlet of the valve head into the gap between the filter bottle and the filter screen, flows into the center of the filter screen frame after being filtered by the filter screen, and then flows from the center of the filter screen frame to the water outlet of the valve head.

[0003] During the use of the pre-filter, it is necessary to clean the impurities attached to the surface of the filter screen in situ from time to time, and then discharge them through the drainage component. The efficient operation of the cleaning / scraping structure is very important. In the prior art, there are cleaning / scraping structures driven by motors, cleaning / scraping structures driven by impellers, etc., and backwashing is also an efficient means of cleaning the filter screen of the pre-filter. However, the cleaning / scraping structure of the prior art is not controlled by a driving motor set on the top of the valve head, and the mode switching of normal filtering and backwashing is realized; in addition, the realization of fully automatic cleaning and sewage discharge of the pre-filter is also the future development trend of such products; further, it is inevitable that there will be water leakage during the use of the pre-filter. When water leakage is found, it is very important to close the water inlet channel and the water outlet channel of the pre-filter in time. The technicians in this field are exploring the closing of the valve when leaking (that is, closing the water inlet channel and the water outlet channel at the same time) by the driving motor set on the top of the valve head. The present invention solves the above-mentioned technical problems and provides a pre-filter and a control method with a more optimized structure and easy industrialization to realize top control backwashing and sewage discharge. Summary of the invention

[0004] The second purpose of the present invention is to solve the deficiencies of the pre-filter of the prior art, and provide a pre-filter with top control backwashing and sewage discharge, which adopts the above-mentioned valve head structure. The pre-filter has automatic switching of backwashing, sewage discharge and recovery filtering modes, and / or integrates the valve closing protection function when leaking, that is, it can close the waterway in the state of leaking.

[0005] One of the purposes of the present invention is to solve the deficiencies of the prior art pre-filter and provide a control method for a top-controlled backwash and sewage pre-filter. The method controls the backwash, sewage and / or leakage protection valve closing actions by a motor, has a compact structure, a high degree of automation and high reliability.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] The valve head structure for controlling backwashing and sewage discharge at the top includes a controller, a valve head body with a water inlet port, a water outlet port and a filter bottle assembly port, a filter bottle, a filter assembly arranged in the filter bottle and a sewage discharge cavity arranged at the bottom of the filter bottle, and also includes a drive motor assembly, a control assembly, a transmission assembly, a sewage discharge switching assembly and a backwashing assembly;

[0008] The drive motor assembly comprises a drive motor, the drive motor is fixed to the valve head body, and the valve head body is provided with an assembly cavity adapted to the output end of the drive motor;

[0009] The control assembly includes a first limit switch;

[0010] The transmission assembly includes a transmission shaft, which is connected to the output end of the drive motor and rotates with the assembly cavity. The sewage switching assembly is arranged at the end of the transmission shaft, and the transmission shaft can move axially under the action of the drive motor.

[0011] The sewage discharge switching assembly includes a sewage discharge plug body, the sewage discharge plug body includes a connecting portion and a functional portion, the connecting portion and / or the functional portion is provided with a sewage discharge notch, connected to the transmission portion through the connecting portion, the functional portion is provided with at least a first sealing element, and the sewage discharge plug body can open or close the sewage discharge channel through the sewage discharge notch under the drive of the driving motor assembly;

[0012] The backwashing assembly includes a backwashing frame, a backwashing filter and a sealing part. The backwashing assembly is sleeved on the transmission shaft and can move axially with the transmission shaft under the drive of the driving motor assembly.

[0013] The filter assembly includes a filter frame, a filter element and a filter frame water inlet channel, and the backwash frame is inserted into the filter frame and axially slidingly sealed.

[0014] The transmission shaft moves axially from the initial position to the first limit switch position, the sealing part can close the water inlet channel of the filter frame, and the backwash water channel of the backwash filter is opened, and the drain plug body opens the drain channel of the drain cavity; the transmission shaft moves axially to the initial position, the water inlet channel of the filter frame is opened, and the backwash water channel of the backwash filter is closed, and the drain plug body closes the drain channel of the drain cavity;

[0015] The initial position is the position where the pre-filter is in a filtering state, and the drive motor and the first limit switch are both electrically connected to the controller.

[0016] Preferably, the control component also includes a second limit switch, which is located below the first limit switch. The sealing portion is provided with a first sealing portion and a second sealing portion. The backwash filter is arranged between the first sealing portion and the second sealing portion. When the first limit switch is in position, the first sealing portion closes the water inlet channel of the pre-filter filtering mechanism; when the driving motor drives the transmission shaft to continue to run to the second limit switch position, the second sealing portion closes the inner water inlet of the water inlet port and the inner water outlet of the water outlet port to close the valve. The second limit switch is electrically connected to the controller.

[0017] Preferably, a flow sensor electrically connected to the controller is further provided in the channel of the water inlet port of the valve head body, and the flow sensor transmits flow data to the controller. When the flow data exceeds a set value, the controller sends a valve closing instruction to the drive motor; after the fault is eliminated, the controller receives an external instruction and sends a valve opening instruction to the drive motor;

[0018] Alternatively, a valve closing or valve cancelling instruction is manually issued to the controller, and the controller responds and issues a running instruction to the drive motor;

[0019] The flow sensors include Hall flow sensors, electromagnetic flow sensors, vortex flow sensors, impeller flow sensors and ultrasonic flow sensors.

[0020] Preferably, the filter skeleton is a filter mesh skeleton, and the filter element is a filter mesh or PP cotton or a filter membrane; or the filter skeleton is a laminate skeleton, and the filter element is a filter laminate; the controller can be connected to a remote server or a user terminal via wireless communication, and the controller is provided with a remote communication unit, and the remote communication unit includes a wireless communication module electrically connected to a circuit board of the controller.

[0021] Preferably, the filter skeleton is a laminate skeleton, the filter element is a filter laminate, and a laminate adjusting piece is provided at the lower end of the laminate skeleton, the laminate adjusting piece abuts against the filter laminate, and the laminate adjusting piece can move axially with the transmission shaft to release the abutment to loosen the filter laminate or restore the abutment to compact the filter laminate; the controller has a processor function, and the wireless communication module is any one or a combination of two of a 2G module, a 3G module, a 4G module, a 5G module and a WiFi module, and the remote server and the user terminal can receive information or remotely control the controller through the wireless communication module; at least one MCU is integrated on the circuit board of the controller, and the operation of the components electrically connected to it is controlled by the MCU, and the wireless communication module is also integrated on the circuit board of the controller.

[0022] Preferably, the stack adjustment member includes an adjustment seat and an elastic reset element, one end of the elastic reset element is fixed to the adjustment seat, and the other end can abut or be fixed to the inner wall of the bottom of the filter bottle, the adjustment seat and the transmission shaft can be fixed axially, when the transmission shaft moves axially downward, the elastic reset member is compressed, the abutment is released, and the filter stack is loosened, and when the transmission shaft moves axially upward, the elastic reset member can be reset, the abutment is restored, and the filter stack is compressed.

[0023] Preferably, the diameter of the connecting part is smaller than the diameter of the functional part, and the gap between the outer periphery of the connecting part and the sewage discharge cavity constitutes a sewage discharge gap. The control component also includes an initial position limit switch, which is arranged at the initial position and is electrically connected to the controller to achieve precise resetting. The first limit switch, the second limit switch and the initial limit switch are selected from any one or more of a photoelectric sensing switch, a Hall switch and a micro switch.

[0024] Preferably, the transmission shaft includes a rotating shaft and a transmission rod, the rotating shaft is provided with an external thread, the assembly cavity is provided with an internal thread, the rotating shaft and the transmission rod are detachably connected, and the drive motor output shaft of the drive motor is detachably connected to the rotating shaft.

[0025] Preferably, the rotating shaft is sleeved on the transmission rod and is provided with a retaining spring assembly opening and fixed by the retaining spring. The end of the rotating shaft is provided with a special-shaped hole or a special-shaped portion, and the end of the output shaft of the driving motor is provided with an adaptable special-shaped portion or special-shaped hole, which is connected through the matching of the special-shaped hole and the special-shaped portion.

[0026] Preferably, the drive motor assembly also includes a drive motor fixing seat, a drive motor assembly groove is provided on the top of the drive motor fixing seat, the drive motor is clamped in the drive motor assembly groove, a limit switch installation groove is provided on the side of the drive motor fixing seat, and the first limit switch, the second limit switch and the initial limit switch are fixed in the limit switch installation groove.

[0027] Preferably, the driving shaft and the transmission rod are respectively provided with limiting parts, and the two ends of the backwashing skeleton are respectively abutted against the limiting parts of the driving shaft and the transmission rod.

[0028] Preferably, the first sealing element is an O-ring, the functional part of the drain plug body is provided with a sealing element assembly groove, the first sealing element is fixed in the sealing element assembly groove, and the connecting part is also provided with a drain guide groove.

[0029] A control method for a pre-filter, the control method steps are as follows:

[0030] Step S1: The pre-filter is assembled and adjusted to the initial position. The controller sets the initial position to the filtering mode, the first limit switch position to the backwashing mode, and the second limit switch position to the valve closing mode;

[0031] Step S2: The controller presets parameters for starting and stopping backwashing of the pre-filter, wherein the parameters include any one or more of time, pressure, and flow rate, and configures an adapted sensor to be electrically connected to the controller;

[0032] Step S3: The controller presets parameters for closing the valve in a leaking state and opening the valve in a non-leaking state of the pre-filter, wherein the parameters include any one or more of the flow rate, flow velocity, and duration of a constant flow velocity, and configures an adapted sensor to be electrically connected to the controller;

[0033] Step S4: the pre-filter operates in the filtering mode, when the backwashing parameter reaches the preset start parameter, the driving motor rotates, the driving transmission shaft axially moves downward to the first limit switch position, the sealing part closes the filter frame water inlet channel (11), and the backwashing water channel of the backwashing filter is opened, the controller operates in the backwashing mode, when the backwashing parameter reaches the preset stop parameter, the driving motor reverses, the driving transmission shaft axially moves upward to the initial position, the sealing part opens the filter frame water inlet channel (11), and the backwashing water channel of the backwashing filter is closed;

[0034] Step S5: When the operating parameters of the pre-filter reach the preset valve closing parameters under the water leakage state, the driving motor rotates, and the driving transmission shaft moves axially downward to the second limit switch position, closing the water inlet port close to the water inlet channel (11) of the filter frame and the inner water outlet of the water outlet port;

[0035] Step S6: When the operating parameters of the pre-filter reach the preset valve opening parameters in the non-leakage state, the driving motor is reversed, and the driving shaft is axially moved upward to the first limit switch position to enter the backwash mode, or directly axially moved upward to the initial position to enter the filtering mode;

[0036] The controller controls steps S4-S6 to be repeated according to the operating status.

[0037] The beneficial effects of the present invention are:

[0038] The valve head has a more optimized structure and is easy to install, use and maintain. The backwashing, sewage discharge and / or water leakage protection valve closing action is controlled by a motor. The structure is compact and the degree of automation and reliability are high.

[0039] The pre-filter has the function of automatically switching backwashing, draining and resuming filtering modes, and / or is integrated with a valve closing protection function in case of water leakage, that is, it can close the water path in the case of water leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the structure of the present invention;

[0041] Figure 2 It is a schematic diagram of the structure of the present invention;

[0042] Figure 3 It is a schematic diagram of the structure of the present invention;

[0043] Figure 4 It is a structural schematic diagram of the present invention (filtering state);

[0044] Figure 5 It is a schematic diagram of the structure of the present invention (backwashing and sewage discharge state);

[0045] Figure 6 It is a schematic diagram of the structure of the present invention (valve closed state).

[0046] In the figure: 1. valve head body, 2. driving motor, 3. drain plug body, 31. connecting part, 32. functional part, 33. first sealing element, 4. backwashing skeleton, 5. sealing part, 51. first sealing part, 52. second sealing part, 6. backwashing filter, 7. rotating shaft, 8. transmission rod, 9. limit switch mounting groove, 10. filter skeleton, 11. filter skeleton water inlet channel, 12. filter element, 13. stacking adjustment part, 14. filter bottle. DETAILED DESCRIPTION

[0047] The technical solution of the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0048] like Figure 1-6 As shown, the valve head structure for controlling backwashing and sewage discharge at the top includes a controller (not shown in the figure), a valve head body 1 with a water inlet port, a water outlet port and a filter bottle assembly port, a filter bottle 14, a filter assembly arranged in the filter bottle 14 and a sewage discharge cavity arranged at the bottom of the filter bottle 14, and also includes a drive motor assembly, a control assembly, a transmission assembly, a sewage discharge switching assembly and a backwashing assembly;

[0049] The drive motor assembly includes a drive motor 2, which is fixed to the valve head body 1, and the valve head body 1 is provided with an assembly cavity adapted to the output end of the drive motor 2;

[0050] The control assembly includes a first limit switch;

[0051] The transmission assembly includes a transmission shaft, which is connected to the output end of the drive motor 1 and rotates with the assembly cavity. The sewage switching assembly is arranged at the end of the transmission shaft, and the transmission shaft can move axially under the action of the drive motor 1;

[0052] The sewage switching assembly includes a sewage plug body 3, the sewage plug body 3 includes a connecting portion 31 and a functional portion 32, the connecting portion 31 and / or the functional portion 32 are provided with a sewage discharge gap, specifically, the diameter of the connecting portion 31 is smaller than the diameter of the functional portion 32, the gap between the outer periphery of the connecting portion 31 and the sewage discharge cavity constitutes the sewage discharge gap, and is connected to the transmission portion through the connecting portion 31, the functional portion is provided with at least a first sealing element 33, and the sewage plug body 3 can open or close the sewage discharge channel under the drive of the driving motor assembly;

[0053] The backwashing assembly includes a backwashing frame 4, a backwashing filter 6 and a sealing portion 5. The backwashing assembly is sleeved on the transmission shaft and can move axially with the transmission shaft under the drive of the driving motor assembly.

[0054] The filter assembly includes a filter frame, a filter element and a filter frame water inlet channel, and the backwash frame is inserted into the filter frame and axially slidingly sealed.

[0055] The transmission shaft moves axially from the initial position to the first limit switch position, the sealing part can close the water inlet channel of the filter frame, and the backwash water channel of the backwash filter is opened, and the drain plug body opens the drain channel of the drain cavity; the transmission shaft moves axially to the initial position, the water inlet channel of the filter frame is opened, and the backwash water channel of the backwash filter is closed, and the drain plug body closes the drain channel of the drain cavity;

[0056] The initial position is the position where the pre-filter is in a filtering state, and the drive motor 2 and the first limit switch are both electrically connected to the controller.

[0057] In this embodiment, the control component also includes a second limit switch, which is located below the first limit switch. The sealing part 5 is provided with a first sealing part 51 and a second sealing part 52. The backwash filter 6 is arranged between the first sealing part 51 and the second sealing part 52. When the first limit switch is in position, the first sealing part 51 closes the water inlet channel 11 of the filter skeleton; when the drive motor 2 drives the transmission shaft to continue to run to the second limit switch position, the second sealing part 52 closes the water inlet port close to the water inlet channel 11 of the filter skeleton and the inner water outlet of the water outlet port to realize valve closing. The second limit switch is electrically connected to the controller.

[0058] In this embodiment, a flow sensor electrically connected to the controller is further provided in the channel of the water inlet port of the valve head body 1. The flow sensor transmits flow data to the controller. When the flow data exceeds the set value, the controller sends a valve closing instruction to the drive motor; after the fault is eliminated, the controller sends a valve opening instruction to the drive motor after receiving the external instruction; or sends a valve closing or valve closing cancellation instruction to the controller manually, and the controller responds and sends a running instruction to the drive motor;

[0059] The flow sensors include Hall flow sensors, electromagnetic flow sensors, vortex flow sensors, impeller flow sensors and ultrasonic flow sensors.

[0060] In this embodiment, the filter skeleton 10 is a filter mesh skeleton, and the filter element 12 is a filter mesh or PP cotton or a filter membrane; or the filter skeleton 10 is a laminate skeleton, and the filter element 12 is a filter laminate; the controller can be connected to a remote server or a user terminal through wireless communication, and the controller is provided with a remote communication unit, and the remote communication unit includes a wireless communication module electrically connected to a circuit board of the controller.

[0061] Specifically, the filter skeleton 10 is a laminate skeleton, the filter element 12 is a filter laminate, and a laminate adjusting member 13 is provided at the lower end of the laminate skeleton, the laminate adjusting member 13 is in contact with the filter laminate, and the laminate adjusting member 13 can move axially with the transmission shaft to release the contact to loosen the filter laminate or restore the contact to compress the filter laminate; the controller has a processor function, and the wireless communication module is any one or a combination of two of a 2G module, a 3G module, a 4G module, a 5G module and a WiFi module, and the remote server and the user terminal can receive information or remotely control the controller through the wireless communication module; at least one MCU is integrated on the circuit board of the controller, and the operation of the components electrically connected to it is controlled by the MCU, and the wireless communication module is also integrated on the circuit board of the controller.

[0062] More specifically, the stack adjustment member 13 includes an adjustment seat and an elastic reset element, one end of the elastic reset element is fixed to the adjustment seat, and the other end can abut or be fixed to the bottom inner wall of the filter bottle 14, and the adjustment seat and the transmission shaft can be fixed axially. When the transmission shaft moves axially downward, the elastic reset element is compressed, the abutment is released, and the filter stack is loosened. When the transmission shaft moves axially upward, the elastic reset element can be reset, the abutment is restored, and the filter stack is compressed.

[0063] In this embodiment, the control component also includes an initial position limit switch, which is set at the initial position and electrically connected to the controller to achieve precise resetting. The first limit switch, the second limit switch and the initial limit switch are selected from any one or more of a photoelectric sensing switch, a Hall switch and a micro switch.

[0064] In this embodiment, the transmission shaft includes a rotating shaft 7 and a transmission rod 8. The rotating shaft 7 is provided with an external thread, and the assembly cavity is provided with an internal thread. The rotating shaft 7 and the transmission rod 8 are detachably connected, and the driving motor output shaft of the driving motor 2 is detachably connected to the rotating shaft 7.

[0065] In this embodiment, the rotating shaft 7 is sleeved with the transmission rod 8 and is provided with a retaining spring assembly port, which is fixed by the retaining spring. The end of the rotating shaft 7 is provided with a special-shaped hole or a special-shaped portion, and the end of the output shaft of the driving motor is provided with an adaptive special-shaped portion or special-shaped hole, which is connected through the matching of the special-shaped hole and the special-shaped portion.

[0066] In this embodiment, the drive motor assembly also includes a drive motor fixing seat, a drive motor assembly groove is provided on the top of the drive motor fixing seat, the drive motor is clamped in the drive motor assembly groove, and a limit switch installation groove is provided on the side of the drive motor fixing seat, and the first limit switch, the second limit switch and the initial limit switch are fixed in the limit switch installation groove 9.

[0067] In this embodiment, the driving shaft 7 and the transmission rod 8 are respectively provided with limiting parts, and the two ends of the backwashing skeleton 4 are respectively in contact with the limiting parts of the driving shaft 7 and the transmission rod 8.

[0068] In this embodiment, the first sealing element 33 is an O-ring, the functional portion 32 of the drain plug body 3 is provided with a sealing element assembly groove, the first sealing element 33 is fixed in the sealing element assembly groove, and the connecting portion 31 is also provided with a drain guide groove.

[0069] A control method for a pre-filter, the control method steps are as follows:

[0070] Step S1: The pre-filter is assembled and adjusted to the initial position. The controller sets the initial position to the filtering mode, the first limit switch position to the backwashing mode, and the second limit switch position to the valve closing mode;

[0071] Step S2: The controller presets parameters for starting and stopping backwashing of the pre-filter, wherein the parameters include any one or more of time, pressure, and flow rate, and configures an adapted sensor to be electrically connected to the controller;

[0072] Step S3: The controller presets parameters for closing the valve in a leaking state and opening the valve in a non-leaking state of the pre-filter, wherein the parameters include any one or more of the flow rate, flow velocity, and duration of a constant flow velocity, and configures an adapted sensor to be electrically connected to the controller;

[0073] Step S4: the pre-filter operates in the filtering mode. When the backwashing parameter reaches the preset start parameter, the driving motor rotates, the driving transmission shaft moves axially downward to the first limit switch position, the sealing part closes the water inlet channel of the filter frame, and the backwashing water channel of the backwashing filter is opened. The controller operates in the backwashing mode. When the backwashing parameter reaches the preset stop parameter, the driving motor reverses, the driving transmission shaft moves axially upward to the initial position, the sealing part opens the water inlet channel of the filter frame, and the backwashing water channel of the backwashing filter is closed.

[0074] Step S5: When the operating parameters of the pre-filter reach the preset valve closing parameters under the water leakage state, the driving motor rotates, and the driving transmission shaft moves axially downward to the second limit switch position, closing the water inlet port close to the water inlet channel of the filter frame and the inner water outlet of the water outlet port;

[0075] Step S6: When the operating parameters of the pre-filter reach the preset valve opening parameters in the non-leakage state, the driving motor is reversed, and the driving shaft is axially moved upward to the first limit switch position to enter the backwash mode, or directly axially moved upward to the initial position to enter the filtering mode;

[0076] The controller controls steps S4-S6 to be repeated according to the operating status.

[0077] The beneficial effects of the present invention are:

[0078] The valve head has a more optimized structure and is easy to install, use and maintain. The backwashing, sewage discharge and / or water leakage protection valve closing action is controlled by a motor. The structure is compact and the degree of automation and reliability are high.

[0079] The pre-filter has the function of automatically switching backwashing, draining and resuming filtering modes, and / or is integrated with a valve closing protection function in case of water leakage, that is, it can close the water path in the case of water leakage.

[0080] The above-mentioned embodiment is only a preferred solution of the present invention, and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims. For example, a valve closing or valve canceling instruction is manually sent to the controller, and the controller responds and sends a running instruction to the drive motor 1.

Claims

1. A pre-filter for top-controlled backwashing and sewage discharge, comprising a controller, a valve head body (1) with a water inlet port, a water outlet port and a filter bottle assembly port, a filter bottle (14), a filter assembly arranged in the filter bottle (14) and a sewage discharge chamber arranged at the bottom of the filter bottle (14), characterized in that: It also includes a drive motor assembly, a control assembly, a transmission assembly, a sewage switching assembly and a backwash assembly; The drive motor assembly comprises a drive motor (2), the drive motor (2) is fixed to the valve head body (1), and the valve head body (1) is provided with an assembly cavity adapted to the output end of the drive motor (2); The control assembly includes a first limit switch; The transmission assembly comprises a transmission shaft, the transmission shaft is connected to the output end of the drive motor (2) and is rotationally matched with the assembly cavity, the sewage discharge switching assembly is arranged at the end of the transmission shaft, and the transmission shaft can move axially under the action of the drive motor (2); The sewage discharge switching assembly comprises a sewage discharge plug body, the sewage discharge plug body comprises a connecting portion (31) and a functional portion (32), the connecting portion (31) and / or the functional portion (32) are provided with a sewage discharge notch, and are connected to the transmission portion via the connecting portion (31), the functional portion (32) is provided with at least a first sealing element (33), and the sewage discharge plug body can open or close the sewage discharge channel via the sewage discharge notch under the drive of the driving motor assembly; The backwashing assembly comprises a backwashing frame (4), a backwashing filter (6) and a sealing portion. The backwashing assembly is sleeved on the transmission shaft and can move axially with the transmission shaft under the drive of the driving motor assembly. The filter assembly comprises a filter frame (10), a filter element and a filter frame water inlet channel (11), and the backwash frame is inserted into the filter frame and is axially slidingly sealed. The transmission shaft moves axially from the initial position to the first limit switch position, the sealing portion can close the water inlet channel (11) of the filter frame, and the backwash water channel of the backwash filter (6) is opened, and the sewage plug body opens the sewage channel of the sewage chamber; the transmission shaft moves axially to the initial position, the water inlet channel (11) of the filter frame is opened, and the backwash water channel of the backwash filter (6) is closed, and the sewage plug body closes the sewage channel of the sewage chamber; The initial position is the position where the pre-filter is in a filtering state, and the drive motor (2) and the first limit switch are both electrically connected to the controller.

2. The top control backwash and sewage discharge pre-filter according to claim 1 is characterized by: The control assembly further comprises a second limit switch, which is located below the first limit switch. The sealing portion comprises a first sealing portion (51) and a second sealing portion (52). The backwash filter (6) is arranged between the first sealing portion (51) and the second sealing portion (52). When the first limit switch is in position, the first sealing portion (51) closes the water inlet channel (11) of the filter frame. When the drive motor (2) drives the transmission shaft to continue to run to the second limit switch position, the second sealing portion (52) closes the water inlet port close to the water inlet channel (11) of the filter frame and the inner water outlet of the water outlet port, thereby closing the valve. The second limit switch is electrically connected to the controller.

3. The top control backwash and sewage discharge pre-filter according to claim 1 is characterized by: A flow sensor electrically connected to the controller is also provided in the channel of the water inlet port of the valve head body (1), and the flow sensor transmits flow data to the controller. When the flow data exceeds a set value, the controller sends a valve closing instruction to the drive motor (2); after the fault is eliminated, the controller receives an external instruction and sends a valve opening instruction to the drive motor (2); or manually sends a valve closing or valve closing cancellation instruction to the controller, and the controller responds and sends an operation instruction to the drive motor (2); the flow sensor includes a Hall flow sensor, an electromagnetic flow sensor, a vortex flow sensor, an impeller flow sensor and an ultrasonic flow sensor.

4. The top control backwashing and sewage discharge pre-filter according to claim 1, 2 or 3, characterized in that: The filter skeleton (10) is a filter mesh skeleton, and the filter element (12) is a filter mesh or PP cotton or a filter membrane; or the filter skeleton (10) is a laminate skeleton, and the filter element (12) is a filter laminate; the controller can be connected to a remote server or a user terminal via wireless communication, and the controller is provided with a remote communication unit, and the remote communication unit includes a wireless communication module electrically connected to a circuit board of the controller.

5. The top control backwash and sewage discharge pre-filter according to claim 4 is characterized by: The filter frame (10) is a laminate frame, the filter element (12) is a filter laminate, and a laminate adjustment member (13) is provided at the lower end of the laminate frame, the laminate adjustment member (13) is in contact with the filter laminate, and the laminate adjustment member (13) can move axially with the transmission shaft to release the contact to loosen the filter laminate or restore the contact to compress the filter laminate; the controller has a processor function, the wireless communication module is any one of a 2G module, a 3G module, a 4G module, a 5G module and a WiFi module, or a combination of two, the remote server and the user terminal can receive information or remotely control the controller through the wireless communication module; at least one MCU is integrated on the circuit board of the controller, and the operation of the components electrically connected to it is controlled by the MCU, and the wireless communication module is also integrated on the circuit board of the controller.

6. The top control backwash and sewage discharge pre-filter according to claim 5, characterized in that: The stack adjustment member (13) comprises an adjustment seat and an elastic reset element, one end of the elastic reset element is fixed to the adjustment seat, and the other end can abut or be fixed to the bottom inner wall of the filter bottle (14), and the adjustment seat and the transmission shaft can be fixed axially. When the transmission shaft moves axially downward, the elastic reset element is compressed, the abutment is released, and the filter stack is loosened. When the transmission shaft moves axially upward, the elastic reset element can be reset, the abutment is restored, and the filter stack is pressed.

7. The top control backwashing and sewage discharge pre-filter according to claim 1, 2 or 3, characterized in that: The diameter of the connecting portion (31) is smaller than the diameter of the functional portion (32); the gap between the outer periphery of the connecting portion (31) and the sewage discharge cavity constitutes a sewage discharge gap; the control component further comprises an initial position limit switch, which is arranged at the initial position and is electrically connected to the controller to achieve precise resetting; the first limit switch, the second limit switch and the initial limit switch are selected from any one or more of a photoelectric induction switch, a Hall switch and a micro switch.

8. The top control backwashing and sewage discharge pre-filter according to claim 1, 2 or 3, characterized in that: The transmission shaft comprises a rotating shaft (7) and a transmission rod (8); the rotating shaft (7) is provided with an external thread, the assembly cavity is provided with an internal thread, the rotating shaft (7) and the transmission rod (8) are detachably connected, the drive motor output shaft of the drive motor (2) is detachably connected with the rotating shaft (7), the rotating shaft (7) and the transmission rod (8) are sleeved, and are provided with a retaining spring assembly opening, and are fixed by the retaining spring; the end of the rotating shaft (7) is provided with a special-shaped hole or a special-shaped portion, and the end of the drive motor output shaft is provided with an adaptive special-shaped portion or a special-shaped hole, and is connected by the matching of the special-shaped hole and the special-shaped portion.

9. The top control backwash and sewage discharge pre-filter according to claim 8, characterized in that: The drive motor assembly also includes a drive motor fixing seat, a drive motor assembly groove is provided on the top of the drive motor fixing seat, the drive motor (2) is clamped in the drive motor assembly groove, a limit switch installation groove (9) is provided on the side of the drive motor fixing seat, a first limit switch, a second limit switch and an initial limit switch are fixed in the limit switch installation groove (9), the drive shaft and the transmission rod (8) are respectively provided with a limit portion, and the two ends of the backwashing skeleton (4) are respectively abutted against the limit portions of the drive shaft and the transmission rod (8); the first sealing element (33) adopts an O-ring, the functional part (32) of the sewage plug body is provided with a sealing element assembly groove, the first sealing element (33) is fixed in the sealing element assembly groove, and the connecting part (31) is also provided with a sewage diversion groove.

10. A control method for the pre-filter according to claim 2, characterized in that: The control method steps are as follows: Step S1: The pre-filter is assembled and adjusted to the initial position. The controller sets the initial position to the filtering mode, the first limit switch position to the backwashing mode, and the second limit switch position to the valve closing mode; Step S2: The controller presets parameters for starting and stopping backwashing of the pre-filter, wherein the parameters include any one or more of time, pressure, and flow rate, and configures an adapted sensor to be electrically connected to the controller; Step S3: The controller presets parameters for closing the valve in a leaking state and opening the valve in a non-leaking state of the pre-filter, wherein the parameters include any one or more of the flow rate, flow velocity, and duration of a constant flow velocity, and configures an adapted sensor to be electrically connected to the controller; Step S4: the pre-filter operates in the filtering mode. When the backwashing parameter reaches the preset start parameter, the driving motor rotates, the driving transmission shaft moves axially downward to the first limit switch position, the sealing part closes the water inlet channel of the filter frame, and the backwashing water channel of the backwashing filter is opened. The controller operates in the backwashing mode. When the backwashing parameter reaches the preset stop parameter, the driving motor reverses, the driving transmission shaft moves axially upward to the initial position, the sealing part opens the water inlet channel of the filter frame, and the backwashing water channel of the backwashing filter is closed. Step S5: When the operating parameters of the pre-filter reach the preset valve closing parameters under the water leakage state, the driving motor rotates, and the driving transmission shaft moves axially downward to the second limit switch position, closing the water inlet port close to the water inlet channel of the filter frame and the inner water outlet of the water outlet port; Step S6: When the operating parameters of the pre-filter reach the preset valve opening parameters in the non-leakage state, the driving motor is reversed, and the driving shaft is axially moved upward to the first limit switch position to enter the backwash mode, or directly axially moved upward to the initial position to enter the filtering mode; The controller controls steps S4-S6 to be repeated according to the operating status.

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