Pre-filter with full-automatic pollution discharge and valve closing functions

Abstract

The utility model relates to a pre-filter with full-automatic pollution discharge and valve closing functions, which comprises a controller, a machine head with a water inlet channel and a water outlet channel, a filter bottle and a filter mechanism arranged in the filter bottle, an inner cavity of the filter mechanism is a raw water cavity, a cavity between the filter mechanism and the filter bottle is a purified water cavity, a pollution discharge cavity is arranged at the bottom of the filter bottle, and a valve is arranged in the pollution discharge cavity. A sewage discharging part is arranged in the sewage discharging cavity, the sewage discharging part is provided with a sewage discharging channel, and the electric sewage discharging and valve closing functional mechanism comprises a driving motor assembly, a control assembly, a transmission assembly and a sewage discharging switching assembly. The pre-filter has a full-automatic pollution discharge function, can integrate a water leakage protection function, and can close a waterway in a water leakage state to realize water leakage monitoring protection. According to the pre-filter disclosed by the utility model, pollution discharge and water leakage protection valve closing actions can be controlled by one motor, and the pre-filter is compact in structure, safe and reliable.

Description

Technical Field

[0001] The utility model relates to a pre-filter with a full-automatic sewage discharge and valve closing function, belonging to the technical field of water purification equipment. Background Art

[0002] The pre-filter in the prior art includes: a machine head, a filter bottle connected to the upper end of the machine head, and a drain ball valve connected to the lower end of the filter bottle. A filter screen skeleton is arranged in the filter bottle, and a filter screen is sleeved on the outer wall of the filter screen skeleton. During use, water flows into the gap between the filter bottle and the filter screen from the water inlet of the machine head, flows through the filter screen and then into the center of the filter screen skeleton, and then flows from the center of the filter screen skeleton to the water outlet of the machine head. The pre-filter has now penetrated into thousands of households and high-class hotels.

[0003] During the use of the pre-filter, it is necessary to clean the impurities attached to the surface of the filter screen in place irregularly and then discharge them through the drain ball valve. Realizing the full-automatic cleaning and sewage discharge of the pre-filter is also the future development trend of this type of product. During the use of the pre-filter, the supporting pipe network often leaks due to accidental situations such as aging, leakage, rupture of the water pipe, or the faucet not being tightened or forgotten to be closed. On the one hand, it causes waste of water resources and an increase in water bills, and on the other hand, it may seriously damage the building and cause damage to the house and property losses in severe cases. Especially in densely populated residential areas, a leak in one place may cause losses to multiple adjacent and lower units, bringing inconvenience to the daily life of residents. In places such as high-class hotels, a water pipe burst may cause a flood, which may seriously damage the high-class facilities in the hotel. Such situations occur frequently in real life. Therefore, the monitoring and protection of water leakage are very necessary. Detecting and solving problems early can avoid the expansion of potential hazards, and water leakage monitoring and protection equipment have emerged as the times require. The utility model aims to provide a pre-filter with a full-automatic sewage discharge and valve closing function, which has a more optimized structure and is easy to be realized industrially. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the deficiencies of the pre-filter in the prior art and provide a pre-filter with a full-automatic sewage discharge and valve closing function. This pre-filter has a more optimized structure, is convenient for installation, use and maintenance, and is not easy to cause faults such as jamming. This pre-filter has a full-automatic sewage discharge function and can also integrate a water leakage protection function, and can close the water circuit in the water leakage state to realize water leakage monitoring and protection. That is, the pre-filter of the utility model can realize the sewage discharge and the water leakage protection valve closing actions controlled by one motor, with a compact structure, safety and reliability.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A pre-filter with fully automatic sewage discharge and valve closing functions, comprising a controller, a head with an inlet channel and an outlet channel, a filter bottle, and a filtering mechanism arranged in the filter bottle. The inner cavity of the filtering mechanism is the raw water cavity, the cavity between the filtering mechanism and the filter bottle is the purified water cavity, a sewage discharge cavity is arranged at the bottom of the filter bottle, a sewage discharge part is arranged in the sewage discharge cavity, the sewage discharge part is provided with a sewage discharge channel, and an electric sewage discharge and valve closing function mechanism is further included. The electric sewage discharge and valve closing function mechanism comprises a driving motor assembly, a control assembly, a transmission assembly, and a sewage discharge switching assembly;

[0007] The driving motor assembly comprises a driving motor, the driving motor is fixed to the head, and an assembly cavity corresponding to the output end of the driving motor is arranged at the top of the head;

[0008] The control assembly comprises a first limit switch, which is fixed to the side of the head;

[0009] The transmission assembly comprises a transmission shaft inserted into the filtering mechanism. The transmission shaft can rotate relative to the assembly cavity and is connected to the output end of the driving motor. The sewage discharge switching assembly is arranged at the end of the transmission shaft;

[0010] The sewage discharge switching assembly comprises a sewage discharge bolt. The sewage discharge bolt comprises a connecting part and a functional part, and is connected to the transmission part through the connecting part. At least the lower end of the functional part is provided with a first sealing element. The sewage discharge channel can be opened or closed through the cooperation of the first sealing element, the functional part, and the sewage discharge part;

[0011] Under the normal filtering state, the upper end of the driving part abuts against the first limit switch. In the sewage discharge mode, the driving motor rotates forward, driving the transmission shaft to move axially downward, and then driving the sewage discharge bolt to move axially downward to open the sewage discharge channel; after the sewage discharge is completed, the driving motor rotates reversely, driving the transmission shaft to move axially upward, and then driving the sewage discharge bolt to move axially upward to close the sewage discharge channel. When the upper end of the driving part reaches the position of the first limit switch, the driving motor stops rotating and returns to the filtering state;

[0012] The control assembly further comprises a second limit switch, which is located below the first limit switch;

[0013] A valve sleeve is further sleeved outside the transmission shaft. A valve plug is fixedly arranged at the end of the valve sleeve. The valve sleeve can move axially downward along with the transmission shaft, thereby driving the valve plug to close the inlet channel of the filtering mechanism. The valve sleeve can move axially upward along with the transmission shaft, thereby driving the valve plug to reset and open the inlet channel of the filtering mechanism;

[0014] When the controller receives the command signal to close the water inlet channel, the controller controls the driving motor to rotate forward, driving the transmission shaft to move downward until it touches the second limit switch and then stops running. The valve plug seals the internal water inlet channel of the filtering mechanism, achieving the closure of the water inlet channel. When the signal command to close the water inlet channel is cancelled or the signal command to open the water inlet channel is received, the controller controls the driving motor to rotate reversely, driving the transmission shaft to move upward until it touches the first limit switch. The valve plug moves upward to reset and open the internal water inlet channel of the filtering mechanism. At this time, the first sealing element of the sewage plug seals with the sewage component, closing the sewage channel and achieving the reset.

[0015] The driving motor, the first limit switch, and the second limit switch are all electrically connected to the controller.

[0016] A gasket is detachably provided outside the valve sleeve of the valve plug. The part of the gasket protruding circumferentially from the valve plug constitutes a sealing portion. A adapter is provided in the water inlet channel of the filtering mechanism. The adapter is provided with an adapter port communicating with the water inlet channel. The shape of the sealing portion is adapted to the shape of the adapter, capable of closing and opening the adapter port, and thus closing and opening the water inlet channel of the filtering mechanism. The adapter seals with the machine head through an adapter seal ring to ensure the effect of closing the water channel, or the adapter is integrally formed with the machine head.

[0017] Preferably, a gland is provided outside the gasket. The gland is detachably connected to the valve sleeve through a snap ring, or the gland is screwed or clamped with the valve sleeve, thereby realizing the detachable fixation of the gasket.

[0018] Preferably, the sealing portion is in a rounded corner or bevel angle, and the mating portion of the adapter is in a 20 - 80° inclined plane, preferably 45°. The sealing portion and the adapter can form a seal on the inclined plane portion.

[0019] Preferably, a water leakage monitoring mechanism electrically connected to the controller is further provided in the water inlet channel of the machine head. The water leakage monitoring mechanism includes a flow sensor and a flow detection unit.

[0020] The flow sensor detects the water flow rate through the flow monitoring unit and transmits the flow rate data to the controller. When the flow rate data exceeds the set value, the controller sends a command to the driving motor to close the water inlet channel. After troubleshooting, the controller sends a command to the driving motor to open the water inlet channel after receiving an external command.

[0021] Or a command to close the water inlet channel, cancel the closing of the water inlet channel, or open the water inlet channel is sent to the controller manually. After the controller responds, it sends a running command to the driving motor.

[0022] Preferably, the transmission shaft includes a lifting shaft and a transmission rod. The lifting shaft is provided with an external thread, and the assembly cavity is provided with an internal thread. The lifting shaft is screwed to the transmission rod. The drive motor is provided with a drive motor output shaft, and the drive motor output shaft is detachably connected to the lifting shaft. The lifting shaft has three positions. The uppermost position is the normal filtration state, the middle position is the sewage discharge state, and the lowermost position is the valve closing state. The upper and lower positions are limited by limit switches, and the middle position is controlled by controlling the motion state or time of the drive motor, or each position uses a photoelectric switch, or a magnetic control switch method is used for position control.

[0023] Preferably, the lifting shaft is sleeved with the transmission rod and is provided with a shaft clamp assembly port, which is fixed by a shaft clamp; the end of the lifting shaft is provided with a special-shaped hole, and the end of the drive motor output shaft is provided with a matching special-shaped part, and they are connected through the cooperation of the special-shaped hole and the special-shaped part.

[0024] Preferably, the end of the valve sleeve is provided with a valve plug assembly part, the valve plug is sleeved on the valve plug assembly part, the valve plug is provided with a valve plug sealing ring, and the size can meet the requirement of closing the water inlet channel of the filtration mechanism.

[0025] Preferably, the flow sensor includes a Hall flow sensor, an electromagnetic flow sensor, a vortex street flow sensor, an ultrasonic flow sensor, and an impeller flow sensor.

[0026] Preferably, inside the filtration mechanism and sleeved on the transmission shaft, there is also a scraping and washing component. The scraping and washing component includes a scraping and washing skeleton, and the scraping and washing part is arranged on the scraping and washing skeleton, which abuts against the inner wall of the filtration mechanism. The scraping and washing component can rotate with the transmission shaft to scrape and wash the inner wall of the filtration mechanism.

[0027] Preferably, a conversion disk is arranged at the bottom of the scraping and washing skeleton, and an opening is arranged on the conversion disk. When the opening is opened, sewage is discharged to remove dirt particles at the bottom. When the opening of the conversion disk is closed, a negative pressure is formed in the inner cavity of the scraping and washing component, and suction is formed at both openings of the scraping and washing component to clean the internal filter screen of the filter element component; a flap structure for blocking and opening the opening of the conversion disk is arranged at the lower part of the scraping and washing component, and convex limiting ribs are arranged at the upper and lower parts to form upward circumferential limitation with the filter element component to ensure the operation stability of the scraping and washing component; a scraping and washing sealing ring is arranged between the scraping and washing component and the conversion disk to prevent foreign particles from entering, and a conversion disk sealing ring is arranged between the conversion disk and the bottom of the filter bottle component to prevent foreign particles from being stuck and at the same time ensure the sealing effect of the inner cavity and improve the cleaning effect.

[0028] Preferably, the internal filter screen of the filter element component is integrally injection-molded. A connector is arranged at the upper end of the filter element component and is hermetically connected to the connector. The lower end of the filter element component is hermetically connected to the inner side of the filter bottle. The water inlet channel of the filtration mechanism is arranged on the connector.

[0029] Preferably, the drive motor is provided with a sealing ring for waterproofing, and is hermetically matched with the machine head through a waterproof sealing ring to prevent water from entering the inside of the drive motor.

[0030] The beneficial effects of the present utility model are as follows: The structure of this pre-filter is more optimized, and it is convenient for installation, use and maintenance, and is not prone to faults such as jamming. This pre-filter has a fully automatic sewage discharge function and can also integrate a water leakage protection function, which can close the water circuit in the event of a water leakage to achieve water leakage monitoring and protection. That is to say, the pre-filter of the present utility model can realize the sewage discharge, scraping and washing, and water leakage protection valve closing actions controlled by one motor, with a compact structure, safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of the present utility model;

[0032] Figure 2 is a schematic structural diagram of the present utility model;

[0033] Figure 3 is a schematic structural diagram of the present utility model;

[0034] Figure 4 is an exploded structural diagram of the present utility model

[0035] Figure 5 is a schematic structural diagram of the present utility model (in the normal water passing state);

[0036] Figure 6 is a schematic structural diagram of the present utility model (in the sewage discharge valve opening state);

[0037] Figure 7 is a schematic structural diagram of the present utility model (in the flow channel valve closing state);

[0038] Figure 8 is a schematic structural diagram of the present utility model;

[0039] Figure 9 is a cross-sectional view of another embodiment of the present utility model;

[0040] Figure 10 is a cross-sectional view of another embodiment of the present utility model.

[0041] In the figure: 1. Driving motor, 2-a. Upper limit switch, 2-b. Lower limit switch, 3. Waterproof sealing ring, 4. Machine head, 5. Lifting shaft, 6. Clamp, 7. Shaft clamp, 8. Transmission rod, 9. Valve plug sealing ring, 10. Valve sleeve, 10a. Sealing gasket, 10b. Pressing cover, 10c. Snap ring, 11. Transmission shaft sealing ring, 12. Sewage discharge bolt, 13. Sewage discharge bolt sealing ring, 14. Filter element, 15. Scraping and washing framework, 16. Scraping and washing sealing ring, 17. Conversion disk, 18. Conversion disk sealing ring, 19. Filter bottle, 20. Adapter, 21. Adapter sealing ring, 22. Water leakage monitoring mechanism. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The technical solution of the present utility model will be further specifically described below through specific embodiments in conjunction with the accompanying drawings.

[0043] As Figure 1-7 shown, a pre-filter with fully automatic sewage discharge and valve closing functions includes a controller, a machine head 4 with an inlet channel and an outlet channel, a filter bottle 19, and a filtering mechanism (filter element 14) disposed within the filter bottle 19. The inner cavity of the filtering mechanism is the raw water cavity, and the cavity between the filtering mechanism and the filter bottle 19 is the purified water cavity. A sewage discharge cavity is provided at the bottom of the filter bottle 19, and a sewage discharge member is disposed within the sewage discharge cavity. The sewage discharge member is provided with a sewage discharge channel, and also includes an electric sewage discharge and valve closing function mechanism. The electric sewage discharge and valve closing function mechanism includes a driving motor assembly, a control assembly, a transmission assembly, and a sewage discharge switching assembly;

[0044] The driving motor assembly includes a driving motor 1, which is fixed to the machine head 2. An assembly cavity corresponding to the output end of the driving motor 1 is provided at the top of the machine head 4;

[0045] The control assembly includes a first limit switch 2-a, which is fixed to the side of the machine head 4;

[0046] The transmission assembly includes a transmission shaft inserted into the filtering mechanism, including a lifting shaft 5 and a transmission rod 8. The lifting shaft 5 is screwed and fitted with the assembly cavity, and the end of the lifting shaft 5 is connected to the output end of the driving motor 1. The sewage discharge switching assembly is disposed at the end of the transmission rod 8;

[0047] The sewage discharge switching assembly includes a sewage discharge plug. The sewage discharge plug includes a connecting portion and a functional portion. The diameter of the functional portion is smaller than that of the connecting portion, and it is connected to the transmission shaft through the connecting portion. At least the lower end of the functional portion is provided with a first sealing element (sewage discharge plug sealing ring 13). The sewage discharge channel can be opened or closed through the cooperation of the first sealing element, the functional portion, and the sewage discharge member;

[0048] In the normal filtering state, the upper end of the lifting shaft 5 abuts against the first limit switch 2-a. In the sewage discharge mode, the driving motor 1 rotates forward, driving the transmission rod 8 to move axially downward, and then driving the sewage discharge plug to move axially downward to open the sewage discharge channel; after the sewage discharge is completed, the driving motor 1 rotates reversely, driving the transmission rod 8 to move axially upward, and then driving the sewage discharge plug to move axially upward to close the sewage discharge channel. When the upper end of the lifting shaft 5 reaches the position of the first limit switch 2-a, the driving motor stops rotating and returns to the filtering state;

[0049] The control assembly further includes a second limit switch 2-b, which is located below the first limit switch 2-a;

[0050] A valve sleeve 10 is sleeved outside the transmission rod 8 and is fixedly connected by a snap ring 6. A transmission shaft sealing ring 11 is provided. A valve plug is fixedly provided at the end of the valve sleeve 10. The valve sleeve 10 can move axially downward along with the transmission rod 8, thereby driving the valve plug to close the water inlet channel of the filtering mechanism. The valve sleeve 10 can move axially upward along with the transmission shaft, thereby driving the valve plug to reset and open the water inlet channel of the filtering mechanism;

[0051] When the controller receives a command signal to close the water inlet waterway, the controller controls the driving motor 1 to rotate forward, driving the transmission rod 8 to move downward until it touches the second limit switch 2-b and then stops running. The valve plug seals the internal water inlet channel of the filtering mechanism, realizing the closing of the water inlet waterway. When the signal command to close the water inlet waterway is cancelled or a signal command to open the water inlet waterway is received, the controller controls the driving motor 1 to rotate in reverse, driving the transmission rod 8 to move upward until it touches the first limit switch 2-a. The valve plug moves upward to reset and open the internal water inlet channel of the filtering mechanism. At this time, the first sealing element of the sewage plug seals with the sewage component, closing the sewage channel and realizing the reset;

[0052] The driving motor 1, the first limit switch 2-a, and the second limit switch 2-b are all electrically connected to the controller;

[0053] As Figure 8 shown, a sealing gasket 10a is detachably provided outside the valve plug of the valve sleeve 10. The part of the sealing gasket 10a protruding circumferentially from the valve plug constitutes a sealing part. A adapter 20 is provided in the water inlet channel of the filtering mechanism. The adapter 20 is provided with an adapter port communicating with the water inlet channel. The shape of the sealing part 10a is adapted to the shape of the adapter 20, and can close and open the adapter port, thereby closing and opening the water inlet channel of the filtering mechanism.

[0054] Specifically, a gland 10b is provided outside the sealing gasket 10a. The gland 10b is detachably connected to the valve sleeve 10 by a snap ring 10c, or the gland 10b is screwed or clamped with the valve sleeve 10, thereby realizing the detachable fixation of the sealing gasket 10a.

[0055] In this embodiment, the sealing part is a fillet or an oblique angle, and the fitting part of the adapter 20 is a 20-80° inclined plane. The sealing part and the adapter 20 can form a seal on the inclined plane part.

[0056] In this embodiment, a water leakage monitoring mechanism 22 electrically connected to the controller is further provided in the water inlet channel of the machine head 4. The water leakage monitoring mechanism includes a flow sensor and a flow detection unit;

[0057] The flow sensor detects the water flow through the flow monitoring unit and transmits the flow data to the controller. When the flow data exceeds the set value, the controller sends an instruction to the drive motor to close the water inlet channel; after troubleshooting, the controller sends an instruction to the drive motor to open the water inlet channel after receiving an external instruction;

[0058] Alternatively, an instruction to close the water inlet channel, cancel the closing of the water inlet channel, or open the water inlet channel is sent to the controller manually, and after the controller responds, an operation instruction is sent to the drive motor.

[0059] Specifically, a second sealing element is provided at the upper end of the drain plug. When the valve plug seals the water inlet channel of the filtering mechanism, the second sealing element seals with the drain part, and at the same time, the drain channel is closed.

[0060] Specifically, the lifting shaft 5 is provided with an external thread, the assembly cavity is provided with an internal thread, the lifting shaft 5 is detachably connected to the transmission rod 8, and the drive motor 1 is provided with a drive motor output shaft, and the drive motor output shaft is detachably connected to the lifting shaft 5.

[0061] In this embodiment, the lifting shaft 5 is sleeved with the transmission rod 8 and is provided with a shaft clamp 7 assembly port, which is fixed by the shaft clamp 7; the end of the lifting shaft 5 is provided with a special-shaped hole, and the end of the drive motor output shaft is provided with a matching special-shaped part, which is connected through the cooperation of the special-shaped hole and the special-shaped part.

[0062] In this embodiment, the end of the valve sleeve 10 is provided with a valve plug assembly part, the valve plug is sleeved on the valve plug assembly part, and the size of the valve plug can satisfy the closing of the water inlet channel of the filtering mechanism.

[0063] Specifically, the flow sensor includes a Hall flow sensor, an electromagnetic flow sensor, a vortex street flow sensor, a ultrasonic flow sensor, and an impeller flow sensor. Specifically, according to needs, any one can be selected, and preferably an ultrasonic flow sensor.

[0064] In this embodiment, inside the filtering mechanism (filter element 14), sleeved on the transmission rod 8, there is also a scraping and washing assembly. The scraping and washing assembly includes a scraping and washing skeleton 15 and an adapter plate 17. The scraping and washing part is provided on the scraping and washing skeleton 15 and abuts against the inner wall of the filtering mechanism. The scraping and washing assembly can rotate with the transmission rod 8 to scrape and wash the inner wall of the filtering mechanism.

[0065] During the sewage discharge process, the sewage plug 12 drives the conversion disk 17 and the scraping and washing framework 15 to rotate to scrape and wash the inner filter screen of the filtering mechanism, reversely and forwardly switching the sewage flow channel. There is an opening on the conversion disk 17. When the opening is opened, sewage is discharged to remove dirt particles at the bottom. When the opening of the conversion disk 17 is closed, a negative pressure is formed in the inner cavity of the scraping and washing assembly 15, and suction is formed at both openings of the scraping and washing assembly 15 to clean the inner filter screen of the filter element 14; a flap structure for blocking and opening the opening of the conversion disk 17 is provided at the lower part of the scraping and washing assembly 15, and protruding limiting ribs are provided at the upper and lower parts to form upward circumferential limitation with the filter element 14 to ensure the running stability of the scraping and washing assembly 15; a scraping and washing sealing ring 16 is arranged between the scraping and washing assembly 15 and the conversion disk 17 to prevent foreign particles from entering, and a conversion disk sealing ring 18 is arranged between the conversion disk 17 and the bottom of the filter bottle assembly 19 to prevent foreign particles from being stuck, and at the same time ensure the sealing effect of the inner cavity and improve the cleaning effect. A filter screen is integrally injection-molded inside the filter element 14, and is hermetically connected to the adapter 20 at the upper end and hermetically connected to the inside of the filter bottle assembly at the lower end. The motor assembly 1 itself is provided with a sealing ring to prevent water leakage, and is hermetically matched with the machine head assembly 4 through a waterproof sealing ring 3 to prevent water from entering the inside of the motor assembly 1.

[0066] Embodiment 2

[0067] As Figures 9-10 shown, the basic structure is the same as that of Embodiment 1. The adapter 20 is hermetically sealed with the machine head 4 through an adapter sealing ring 21 to ensure the water shut-off effect of the water passage, or the adapter 20 and the machine head 4 are integrally formed; the sealing part is in a rounded corner or bevel angle, the matching part of the adapter 20 is at 45°, and the sealing part and the adapter 20 can form a seal on the inclined surface part. By means of the water leakage monitoring mechanism 22 at the water inlet position detecting that the flow rate reaches the zero state, the driving motor 1 is controlled to stop rotating, that is, the valve closing is in place.

[0068] The above-described embodiments are only a preferred solution of the present invention, and do not impose any form of limitation on the present invention. There are other variations and modifications without exceeding the technical solutions recorded in the claims. For example, instructions to close the water inlet water passage, cancel the closing of the water inlet water passage, or open the water inlet water passage are sent to the controller manually, and after the controller responds, a running instruction is sent to the driving motor 1.

Claims

1. A pre-filter with fully automatic sewage discharge and valve closing functions, comprising a controller, a head with a water inlet channel and a water outlet channel, a filter bottle and a filter mechanism arranged in the filter bottle, the inner cavity of the filter mechanism is a raw water cavity, the cavity between the filter mechanism and the filter bottle is a purified water cavity, a sewage discharge cavity is arranged at the bottom of the filter bottle, a sewage discharge part is arranged in the sewage discharge cavity, and the sewage discharge part is provided with a sewage discharge channel, characterized in that: It also includes an electric sewage discharge and valve closing function mechanism, which includes a drive motor component, a control component, a transmission component and a sewage discharge switching component; The drive motor assembly includes a drive motor, which is fixed to the machine head, and a mounting cavity corresponding to the output end of the drive motor is provided on the top of the machine head; The control assembly includes a first limit switch fixed to the side of the machine head; The transmission assembly includes a transmission shaft inserted in the filter mechanism, the transmission shaft and the assembly cavity can rotate relative to each other and is connected to the output end of the drive motor, and the sewage switching assembly is arranged at the end of the transmission shaft; The sewage switching assembly includes a sewage plug, and the sewage plug includes a connecting portion and a functional portion, which is connected to the transmission portion through the connecting portion, and a first sealing element is provided at least at the lower end of the functional portion, and the sewage channel can be opened or closed by the cooperation of the first sealing element, the functional portion and the sewage discharge member; In the normal filtering state, the upper end of the driving part abuts against the first limit switch. In the sewage discharge mode, the driving motor rotates forward, driving the transmission shaft to move axially downward, thereby driving the sewage discharge plug to move axially downward to open the sewage discharge channel. After the sewage is discharged, the driving motor reverses, drives the transmission shaft to move axially upward, and then drives the sewage plug to move axially upward to close the sewage discharge channel. When the upper end of the driving part reaches the first limit switch position, the driving motor stops rotating and returns to the filtering state; The control assembly also includes a second limit switch located below the first limit switch; The transmission shaft is also sleeved with a valve sleeve, and a valve plug is fixedly provided at the end of the valve sleeve. The valve sleeve can move downward along with the transmission shaft, thereby driving the valve plug to close the water inlet channel of the filter mechanism. The valve sleeve can move upward along with the transmission shaft, thereby driving the valve plug to reset and open the water inlet channel of the filter mechanism. The driving motor, the first limit switch and the second limit switch are all electrically connected to the controller; The valve sleeve is located on the outside of the valve plug and is detachably provided with a sealing gasket. The part of the sealing gasket protruding circumferentially from the valve plug constitutes a sealing portion. The water inlet channel of the filter mechanism is provided with an adapter. The adapter is provided with an adapter interface connected to the water inlet channel. The shape of the sealing portion is adapted to the shape of the adapter, and the adapter interface can be closed and opened, thereby closing and opening the water inlet channel of the filter mechanism. The adapter is sealed with the machine head through an adapter sealing ring to ensure the water channel closing effect, or the adapter and the machine head are formed integrally.

2. The pre-filter with full-automatic sewage discharge and valve closing function according to claim 1 is characterized in that: The sealing gasket is provided with a pressure cover outside, and the pressure cover is detachably connected to the valve sleeve through a retaining spring, or the pressure cover is screwed or clamped to the valve sleeve, thereby realizing the detachable fixation of the sealing gasket.

3. The pre-filter with full-automatic sewage discharge and valve closing function according to claim 1 is characterized in that: The sealing portion is rounded or beveled, the adapter portion of the adapter is inclined at 20-80 degrees, and the sealing portion and the adapter can form a seal at the inclined portion.

4. The pre-filter with full-automatic sewage discharge and valve closing function according to claim 1 is characterized in that: The adapter portion of the adapter is inclined at 45°.

5. The pre-filter with full-automatic sewage discharge and valve closing function according to claim 1, 2 or 3, characterized in that: The water inlet channel of the machine head is also provided with a water leakage monitoring mechanism electrically connected to the controller, and the water leakage monitoring mechanism includes a flow sensor and a flow detection unit; The flow sensor detects the water flow through the flow monitoring unit and transmits the flow data to the controller. When the flow data exceeds the set value, the controller sends a command to the drive motor to close the water inlet waterway; after the fault is eliminated, the controller receives the external command and sends a command to the drive motor to open the water inlet waterway; Alternatively, a command to close the water inlet passage, cancel the closing of the water inlet passage, or open the water inlet passage is manually issued to the controller, and the controller responds and issues a running command to the drive motor.

6. The pre-filter with full-automatic sewage discharge and valve closing function according to claim 1, 2 or 3, characterized in that: The transmission shaft includes a lifting shaft and a transmission rod. The lifting shaft is provided with an external thread, the assembly cavity is provided with an internal thread, the lifting shaft is threadedly connected to the transmission rod, the drive motor is provided with a drive motor output shaft, the drive motor output shaft is detachably connected to the lifting shaft, the lifting shaft has three positions, the uppermost position is a normal filtering state, the middle position is a sewage discharge state, and the lowermost position is a valve closing state. The upper and lower positions are limited by limit switches, and the middle position is controlled by controlling the movement state or time of the drive motor, or each position uses a photoelectric switch, or a magnetically controlled switch is used to control the position.

7. The pre-filter with full-automatic sewage discharge and valve closing function according to claim 6 is characterized in that: The lifting shaft is sleeved with the transmission rod and is provided with a shaft clamp assembly port, which is fixed by the shaft clamp; the end of the lifting shaft is provided with a special-shaped hole, and the end of the output shaft of the driving motor is provided with an adaptive special-shaped part, which is connected with the special-shaped part through the matching of the special-shaped hole.

8. The pre-filter with full-automatic sewage discharge and valve closing function according to claim 1, 2 or 3, characterized in that: A valve plug assembly portion is provided at the end of the valve sleeve, and the valve plug sleeve is arranged on the valve plug assembly portion. The valve plug is provided with a valve plug sealing ring, and the size thereof can meet the requirements of closing the water inlet channel of the filter mechanism.

9. The pre-filter with full-automatic sewage discharge and valve closing function according to claim 5, characterized in that: The flow sensors include Hall flow sensors, electromagnetic flow sensors, vortex flow sensors, ultrasonic flow sensors and impeller flow sensors.

10. The pre-filter with full-automatic sewage discharge and valve closing function according to claim 1, 2 or 3, characterized in that: The scraping and washing component is located in the filter mechanism and sleeved on the transmission shaft. The scraping and washing component includes a scraping and washing frame. The scraping and washing frame is provided with a scraping and washing part which abuts against the inner wall of the filter mechanism. The scraping and washing component can rotate with the transmission shaft to scrape and wash the inner wall of the filter mechanism.

11. The pre-filter with full-automatic sewage discharge and valve closing function according to claim 10, characterized in that: The scraping and washing skeleton is provided with a conversion disk at the bottom, and an opening is provided on the conversion disk. When the opening is opened, sewage is discharged to remove dirt particles at the bottom. When the opening of the conversion disk is closed, a negative pressure is formed in the internal cavity of the scraping and washing component, and the openings on both sides of the scraping and washing component form suction to clean the internal filter screen of the filter mechanism; the lower part of the scraping and washing component is provided with a baffle structure for blocking and opening the opening of the conversion disk, and the upper and lower parts are provided with protruding limiting ribs to form an upward circumferential limit with the filter mechanism to ensure the operational stability of the scraping and washing component; a scraping and washing sealing ring is provided between the scraping and washing component and the conversion disk to prevent foreign particles from entering, and a conversion disk sealing ring is provided at the bottom of the conversion disk and the filter bottle assembly to prevent foreign particles from getting stuck, while ensuring the sealing effect of the internal cavity and improving the cleaning effect.

12. The pre-filter with full-automatic sewage discharge and valve closing function according to claim 10, characterized in that: The filter mechanism has an integral injection-molded filter screen inside, an adapter is provided at the upper end of the filter mechanism and is sealed with the adapter, the lower end of the filter mechanism is sealed with the inner side of the filter bottle, and the water inlet channel of the filter mechanism is provided at the adapter.

13. The pre-filter with full-automatic sewage discharge and valve closing function according to claim 10, characterized in that: The driving motor is provided with a sealing ring for waterproofing, and is sealed with the machine head through the waterproof sealing ring to prevent water from entering the interior of the driving motor.

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