Filter screen filter capable of being automatically replaced, working method thereof and water purifying device

Abstract

The application provides a filter with automatic replaceable filter screen, a working method thereof and a water purifying device. The filter comprises a water inlet joint, a water outlet joint, a filter screen mounting rack, a filter screen, a mounting rack driving device, a filter screen dismounting device and a filter screen mounting device. The mounting rack driving device drives the filter screen mounting rack to move. A first stop position, a second stop position and a third stop position are arranged on the moving track of the filter screen mounting rack. When the filter screen mounting rack moves to the first stop position, the water inlet cavity, the water outlet cavity and the filter screen mounting through hole cooperate to form a water flow channel. When the filter screen mounting rack moves to the second stop position, the filter screen dismounting device removes the filter screen in the filter screen mounting through hole. When the filter screen mounting rack moves to the third stop position, the filter screen mounting device installs a standby filter screen in the filter screen mounting through hole. The application can automatically replace the filter screen and improve user experience.

Description

Technical Field

[0001] This invention relates to the field of water purification and filtration technology, specifically to an automatically replaceable filter, a method for operating the automatically replaceable filter, and a water purification device using the automatically replaceable filter. Background Technology

[0002] As living standards continue to improve, people are paying more and more attention to water quality, and the usage rate of water purification devices is constantly increasing. Among water purification methods, filtration is the most widely used.

[0003] Filtration-based purification typically uses the principle of "blocking large particles and allowing small particles to pass through," meaning that large-volume substances are blocked on the inlet side of the filter, while substances smaller than the pore size can pass through smoothly. However, over time, as blocked substances accumulate on the inlet side of the filter, resistance increases, leading to problems such as reduced water flow and deterioration of adsorbed substances. Therefore, after a certain period of use, the filter needs to be rinsed or replaced to ensure filtration and flow performance.

[0004] Currently, conventional water purifier filters can only be replaced manually, a cumbersome and difficult process that is extremely user-unfriendly. For example, one existing water inlet device features an automatic filter ejection mechanism. This device estimates the filter's lifespan based on water pressure; when the water pressure decreases and the filter needs replacement or cleaning, the mechanism automatically ejects the filter for easy replacement. However, this method still requires manual filter replacement, impacting the user experience. Summary of the Invention

[0005] The first objective of this invention is to provide an automatically replaceable filter that improves the user experience.

[0006] The second objective of this invention is to provide a water purification device that can automatically replace the filter screen, thereby improving the user experience.

[0007] The third objective of this invention is to provide a method for operating an automatically replaceable filter that improves user experience.

[0008] To achieve the aforementioned first objective, the present invention provides an automatically replaceable filter comprising an inlet connector, an outlet connector, a filter mounting bracket, a filter, a mounting bracket drive device, a filter removal device, and a filter installation device. The inlet connector has an inlet chamber, the outlet connector has an outlet chamber, and the filter mounting bracket has a filter installation through hole, in which the filter is installed. The mounting bracket drive device drives the filter mounting bracket to move, and a first stop position, a second stop position, and a third stop position are provided on the movement trajectory of the filter mounting bracket. When the filter mounting bracket moves to the first stop position, the inlet chamber, the outlet chamber, and the filter installation through hole cooperate to form a water flow channel. When the filter mounting bracket moves to the second stop position, the filter removal device removes the filter from the filter installation through hole. When the filter mounting bracket moves to the third stop position, the filter installation device installs a spare filter into the filter installation through hole.

[0009] As can be seen from the above scheme, the automatically replaceable filter of the present invention, by setting up an inlet connector, an outlet connector, a filter mounting bracket, a filter, a mounting bracket drive device, a filter removal device, and a filter installation device, can control the mounting bracket drive device to move the filter mounting bracket when the filter needs to be replaced. When the filter mounting bracket moves to the second stop position, the filter removal device removes the filter from the filter mounting through hole. When the filter mounting bracket moves to the third stop position, the filter installation device installs a spare filter in the filter mounting through hole. When the filter mounting bracket moves to the first stop position, the inlet chamber, the outlet chamber, and the filter mounting through hole cooperate to form a water flow channel, thereby automatically completing the filter replacement work without manual operation and improving the user experience.

[0010] In a further embodiment, the opening end of the inlet chamber moves back and forth relative to the opening end of the outlet chamber.

[0011] Therefore, it can be seen that the reciprocating movement of the opening end of the inlet chamber relative to the opening end of the outlet chamber allows the filter screen mounting bracket to be released before it leaves the first stopping position, so that the filter screen mounting bracket can move.

[0012] In a further embodiment, the filter also includes a connector drive device, which is connected to the inlet connector and drives the open end of the inlet chamber to reciprocate relative to the open end of the outlet chamber.

[0013] Therefore, it can be seen that the connector driving device drives the opening end of the water inlet chamber to move back and forth relative to the opening end of the water outlet chamber, which can facilitate the control of the distance between the water inlet connector and the water outlet connector.

[0014] In a further embodiment, the connector drive device includes a solenoid valve, a spring, and a valve core connecting rod. The first end of the valve core connecting rod is connected to the water inlet connector, and the second end of the valve core connecting rod is connected to the solenoid valve. The spring is fitted onto the valve core connecting rod, with the first end of the spring abutting against the water inlet connector and the second end of the spring abutting against the solenoid valve. The solenoid valve controls the extension and retraction of the valve core connecting rod.

[0015] Therefore, it can be seen that the connector drive device is equipped with a solenoid valve, a spring and a valve core connecting rod. When fixing the filter screen mounting bracket, the spring can be used to hold the water inlet connector connected to the filter screen mounting bracket. When loosening the filter screen mounting bracket, the solenoid valve can retract the valve core connecting rod to make the water inlet connector detach from the filter screen mounting bracket.

[0016] In a further embodiment, a flexible hose is connected to the inlet end of the inlet connector.

[0017] Therefore, it can be seen that the water inlet end of the water inlet connector is connected to a flexible hose, which facilitates the movement of the water inlet connector.

[0018] In a further embodiment, the filter also includes a control switch valve, which is installed at the inlet end of the inlet connector.

[0019] Therefore, installing a control switch valve at the inlet end of the inlet connector makes it easy to shut off the inlet when replacing the filter.

[0020] In a further embodiment, a first sealing ring is provided at the end of the inlet connector near the filter screen mounting bracket and / or a second sealing ring is provided at the end of the outlet connector near the filter screen mounting bracket.

[0021] Therefore, it can be seen that water leakage can be prevented by setting a sealing ring.

[0022] In a further design, a flow sensor is installed at the outlet connector, and the flow sensor is installed inside the outlet chamber.

[0023] Therefore, installing a flow sensor can monitor water flow and thus determine when to replace the filter.

[0024] In a further design, the outlet connector is equipped with a check valve, which is installed inside the outlet chamber.

[0025] Therefore, it can be seen that the water outlet connector is equipped with a one-way valve to prevent backflow and waste when replacing the filter screen.

[0026] In a further embodiment, the mounting bracket drive device includes a rotating motor and a connecting rod. The rotating shaft of the rotating motor is connected to the first end of the connecting rod, and the rotating shaft of the rotating motor is perpendicular to the connecting rod. The second end of the connecting rod is connected to the filter mounting bracket.

[0027] Therefore, it can be seen that the mounting bracket drive device controls the filter mounting bracket by rotating the motor and connecting rod, which makes it easy to control.

[0028] In a further embodiment, the filter screen removal device includes an ejector and a push rod, with the ejector connected to the push rod; when the filter screen mounting through hole moves to the second stopping position, the push rod is located inside the filter screen mounting through hole and performs telescopic movement.

[0029] Therefore, the filter screen removal device is equipped with an ejector and a push rod. The ejector can be used to control the push rod to eject the filter screen out of the filter screen installation hole.

[0030] In a further embodiment, the ejection device includes a pneumatic cylinder or a hydraulic cylinder.

[0031] Therefore, using a pneumatic or hydraulic cylinder as the ejection device facilitates control.

[0032] In a further embodiment, the filter installation device includes a filter ejection device and a spare parts compartment. The outlet of the spare parts compartment is configured to cooperate with the filter installation through hole. The spare filter is located in the spare parts compartment, and the filter ejection device is used to eject the spare filter from the spare parts compartment.

[0033] Therefore, the filter installation device uses a filter ejection device to eject the spare filter from the spare parts compartment, allowing the spare filter to enter the filter installation through hole, thus completing the installation.

[0034] In a further embodiment, the filter ejection device includes a stepper motor, a gear, and a rack. The gear is mounted on the shaft of the stepper motor, the rack meshes with the gear, and one end of the rack abuts against a spare filter.

[0035] Therefore, it can be seen that the filter ejection device uses a stepper motor, gears and racks, which can easily control the ejection distance and avoid damaging the filter.

[0036] To achieve the second objective of the present invention, the water purification device provided by the present invention is equipped with a filter; the filter adopts the above-mentioned automatically replaceable filter screen.

[0037] To achieve the third objective of this invention, the working method of the automatically replaceable filter provided by this invention includes: when it is confirmed that a filter replacement operation is required, the mounting bracket driving device drives the filter mounting bracket to move to the second stopping position, and the filter removal device removes the filter from the filter mounting through hole; the mounting bracket driving device drives the filter mounting bracket to move to the third stopping position, and the filter mounting device installs a spare filter in the filter mounting through hole; the mounting bracket driving device drives the filter mounting bracket to move to the first stopping position, so that the inlet chamber, the outlet chamber and the filter mounting through hole cooperate to form a water flow channel.

[0038] As can be seen from the above scheme, when the filter needs to be replaced, the control mounting bracket drive device drives the filter mounting bracket to move. When the filter mounting bracket moves to the second stop position, the filter removal device removes the filter from the filter mounting through hole. When the filter mounting bracket moves to the third stop position, the filter installation device installs the spare filter in the filter mounting through hole. When the filter mounting bracket moves to the first stop position, the inlet chamber, outlet chamber, and filter mounting through hole cooperate to form a water flow channel, thereby automatically completing the filter replacement work without human operation and improving the user experience.

[0039] In a further embodiment, the method also includes: before the mounting bracket drive device drives the filter mounting bracket to move to the second stopping position, controlling the opening end of the water inlet chamber to move away from the opening end of the water outlet chamber; after the mounting bracket drive device drives the filter mounting bracket to move to the first stopping position, controlling the opening end of the water inlet chamber to move closer to the opening end of the water outlet chamber.

[0040] Therefore, before the mounting bracket drive device moves the filter mounting bracket to the second stopping position, controlling the opening end of the water inlet chamber away from the opening end of the water outlet chamber allows the filter mounting bracket to be released. After the mounting bracket drive device moves the filter mounting bracket to the first stopping position, controlling the opening end of the water inlet chamber to approach the opening end of the water outlet chamber allows the filter mounting bracket to be pressed against it, forming a water passage.

[0041] In a further solution, the method also includes: detecting the cumulative water flow rate through a flow sensor, and confirming that the filter needs to be replaced when the cumulative water flow rate is greater than or equal to a preset flow rate value.

[0042] Therefore, by monitoring the water flow rate, the system can automatically determine when to replace the filter when the cumulative water flow rate is greater than or equal to the preset flow rate value. Attached Figure Description

[0043] Figure 1 This is an exploded view of the first embodiment of the automatically replaceable filter of the present invention.

[0044] Figure 2 This is a cross-sectional view of the installation structure of the inlet connector, outlet connector, filter mounting bracket, filter, and mounting bracket drive device in the first embodiment of the automatically replaceable filter of the present invention.

[0045] Figure 3 This is a schematic diagram of the movement trajectory of the filter mounting bracket in the first embodiment of the automatically replaceable filter of the present invention.

[0046] Figure 4 This is a cross-sectional view of the filter installation device in the first embodiment of the automatically replaceable filter of the present invention.

[0047] Figure 5 This is an exploded view of the first embodiment of the automatically replaceable filter of the present invention.

[0048] Figure 6 This is a structural diagram of the filter with automatic filter replacement according to the first embodiment of the present invention when the filter mounting bracket and the filter are loosened.

[0049] Figure 7 This is a structural diagram of the filter mounting bracket when it moves to the second stopping position in the first embodiment of the automatically replaceable filter of the present invention.

[0050] Figure 8 This is a structural diagram of the filter mounting bracket when it moves to the second stopping position in the first embodiment of the automatically replaceable filter of the present invention.

[0051] Figure 9 This is a schematic diagram of the movement trajectory of the filter mounting bracket in the second embodiment of the automatically replaceable filter of the present invention.

[0052] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0053] First embodiment of an automatically replaceable filter:

[0054] like Figure 1 and Figure 2 As shown in this embodiment, the automatically replaceable filter includes an inlet connector 1, an outlet connector 2, a filter mounting bracket 3, a mounting bracket drive device 4, a filter removal device 5, a filter installation device 6, a filter 7, and a connector drive device 8.

[0055] The water inlet connector 1 is provided with a water inlet chamber 11, the open end of which faces the filter mounting bracket 3. A first sealing ring 12 is provided at the end of the water inlet connector 1 closest to the filter mounting bracket 3. The first sealing ring 12 surrounds the open end of the water inlet chamber 11 circumferentially, providing a sealing function when the water inlet connector 1 is connected to the filter mounting bracket 3. A water inlet end 13 is provided on the side of the water inlet connector 1 facing away from the open end of the water inlet chamber 11, and a flexible hose 14 is connected to the water inlet end 13. The filter also includes a control switch valve 15, which is installed at the water inlet end 13 of the water inlet connector 1 and is used to control the inflow of water. In this embodiment, the control switch valve 15 is connected to the water inlet end 13 of the water inlet connector 1 via the flexible hose 14.

[0056] The water outlet connector 2 is provided with a water outlet chamber 21, the open end of which faces the filter screen mounting bracket 3. A second sealing ring 22 is provided at the end of the water outlet connector 2 closest to the filter screen mounting bracket 3. The second sealing ring 2 surrounds the open end of the water outlet chamber 21 circumferentially, providing a sealing function when the water outlet connector 2 is connected to the filter screen mounting bracket 3. The water outlet connector 2 is also provided with a one-way valve 23 and a flow sensor 24. Both the one-way valve 23 and the flow sensor 24 are installed inside the water outlet chamber 21. The one-way valve 23 controls the unidirectional flow of water in the water outlet chamber 21, and the flow sensor 24 detects the flow rate of water passing through the water outlet chamber 21.

[0057] The filter mounting bracket 3 is provided with a filter mounting through hole 31, and the filter 7 is installed in the filter mounting through hole 31. The filter 7 is located on the side close to the water inlet connector 1.

[0058] The mounting bracket drive device 4 is used to drive the filter mounting bracket 3 to move. In this embodiment, the mounting bracket drive device 4 includes a rotating motor 41 and a connecting rod 42. The rotating shaft 411 of the rotating motor 41 is connected to the first end of the connecting rod 42. The rotating shaft 411 of the rotating motor 41 is perpendicular to the connecting rod 42. The second end of the connecting rod 42 is connected to the filter mounting bracket 3.

[0059] See Figure 3 The mounting bracket drive device 4 drives the filter mounting bracket 3 to move. A first stopping position A, a second stopping position B, and a third stopping position C are set along the moving trajectory of the filter mounting bracket 3. In this embodiment, when the viewing angle is towards the direction of the rotating shaft extension of the rotating motor 41, the first stopping position A is located at the top of the rotating motor 41, i.e., at 0 degrees. The second stopping position B is located to the left of the rotating motor 41, i.e., at 90 degrees. The third stopping position C is located in the direction of the rotating motor 41, i.e., at 180 degrees. When the filter mounting bracket 3 moves to the first stopping position A, the inlet chamber 11, the outlet chamber 21, and the filter mounting through hole 31 cooperate to form a water flow channel. When the filter mounting bracket 3 moves to the second stopping position B, the filter removal device 5 removes the filter 7 from the filter mounting through hole 31. When the filter mounting bracket 3 moves to the third stopping position C, the filter mounting device 6 installs a spare filter 9 into the filter mounting through hole 31.

[0060] In this embodiment, the filter screen removal device 5 includes an ejector device 51 and a push rod 52. The ejector device 51 is connected to the push rod 52. When the filter screen mounting through hole 31 moves to the second stopping position B, the push rod 52 is located inside the filter screen mounting through hole 31 and performs a telescopic movement. The push rod 52 is used to eject the filter screen 7 out of the filter screen mounting through hole 31, thereby removing the filter screen 7. Preferably, the ejector device 51 includes a cylinder or a hydraulic cylinder.

[0061] See Figure 4The filter installation device 6 includes a filter ejection device 61 and a spare parts compartment 62. The outlet of the spare parts compartment 62 is configured to mate with the filter installation through hole 31. A spare filter 9 is located inside the spare parts compartment 62. The filter ejection device 61 is used to eject the spare filter 9 from the spare parts compartment 62. In this embodiment, the filter ejection device 61 includes a stepper motor 611, a gear 612, and a rack 613. The gear 612 is mounted on the shaft of the stepper motor 611, and the rack 613 meshes with the gear 612. One end of the rack 613 abuts against the spare filter 9. By driving the rack 613 with the stepper motor 611, the spare filter 9 can be ejected from the spare parts compartment 62 and pushed into the filter installation through hole 31, completing the installation. In addition, the filter ejection device 61 can also be a cylinder or a hydraulic cylinder.

[0062] The connector drive device 8 is used to connect to the water inlet connector 1. The connector drive device 8 drives the open end of the water inlet chamber 11 to move back and forth relative to the open end of the water outlet chamber 21. In this embodiment, the connector drive device 8 includes a solenoid valve 81, a valve core connecting rod 82, and a spring 83. The first end of the valve core connecting rod 82 is connected to the water inlet connector 1, and the second end of the valve core connecting rod 82 is connected to the solenoid valve 81. The spring 83 is fitted on the valve core connecting rod 82, with the first end of the spring 83 abutting against the water inlet connector 1 and the second end of the spring 83 abutting against the solenoid valve 81. The solenoid valve 81 controls the extension and retraction of the valve core connecting rod 82. Specifically, the solenoid valve 81 has a coil and a metal rod located within it. When the coil is energized, a magnetic field is formed, which drives the metal rod to move. The metal rod is fixedly connected to the valve core connecting rod 82. Therefore, by energizing or de-energizing the coil, the valve core connecting rod 82 can be driven to extend and retract. Of course, the connector drive device 8 can also use a cylinder or hydraulic cylinder to drive the valve core connecting rod 82 to extend and retract.

[0063] It should be noted that, in optional embodiments, when the opening end of the water inlet chamber 11 moves back and forth relative to the opening end of the water outlet chamber 21, a driving mechanism can also be set to drive the water outlet connector 2 to move, or a driving mechanism can be set to drive the water inlet connector 1 and the water outlet connector 2 to move simultaneously.

[0064] In this embodiment, the automatically replaceable filter first checks whether a filter replacement is needed during operation. When the filter is working normally, the filter mounting bracket 3 is in the first stopping position A, and the system simultaneously checks whether a filter replacement is required. In this embodiment, the step of checking whether a filter replacement is needed includes: detecting the cumulative water flow rate using the flow sensor 24; if the cumulative water flow rate is greater than or equal to a preset flow rate value, then a filter replacement is confirmed. The preset flow rate value is pre-set based on implementation data.

[0065] When it is confirmed that a filter replacement is needed, the opening end of the inlet chamber 11 is moved away from the opening end of the outlet chamber 21. In this embodiment, the inlet connector 1 is moved away from the outlet connector 2 by the connector drive device 8, so that the inlet connector 1 and the outlet connector 2 are loosened from the filter mounting bracket 3. The state after the filter mounting bracket 3 is loosened is as follows. Figure 5 As shown. Of course, to avoid wasting water when replacing the filter, the control valve 15 should be closed first to stop the water intake.

[0066] After the filter mounting bracket 3 is released, the mounting bracket driving device 4 drives the filter mounting bracket 3 to move to the second stopping position B, and the filter removal device 5 removes the filter 7 from the filter mounting through hole 31. In this embodiment, when the filter mounting bracket 3 moves from the first stopping position A to the second stopping position B, the ejection device 51 controls the ejector rod 52 to move in the direction of the filter mounting bracket 3, ejecting the filter 7 out of the filter mounting through hole 31, thereby removing the filter 7. The state diagram after removing the filter 7 is shown in the figure. Figure 6 As shown.

[0067] After the filter screen 7 is removed, the mounting bracket drive device 4 drives the filter screen mounting bracket 3 to move to the third stopping position C, and the filter screen mounting device 6 installs the spare filter screen 9 into the filter screen mounting through hole 31. In this embodiment, when the filter screen mounting bracket 3 moves to the third stopping position C, the filter screen mounting through hole 31 is aligned with the spare parts compartment 62. The state diagram of the alignment of the filter screen mounting through hole 31 and the spare parts compartment 62 is shown in the figure. Figure 7 As shown. Next, the stepper motor 611 drives the rack 613, which can push the spare filter 9 out of the spare parts compartment 62 and into the filter installation through hole 31, completing the installation. The state diagram of the completed installation is shown below. Figure 8 As shown.

[0068] After the spare filter screen 9 is installed into the filter screen mounting through hole 31, the mounting bracket drive device 4 drives the filter screen mounting bracket 3 to move to the first stopping position A, controlling the opening end of the water inlet chamber 11 to approach the opening end of the water outlet chamber 21, so that the water inlet chamber 11, the water outlet chamber 21 and the filter screen mounting through hole 31 cooperate to form a water flow channel. In this embodiment, after the mounting bracket drive device 4 drives the filter screen mounting bracket 3 to move to the first stopping position A, the connector drive device 8 controls the water inlet connector 1 to move towards the water outlet connector 2, so that the water inlet connector 1 and the water outlet connector 2 fix the filter screen mounting bracket 3, the water inlet chamber 11, the water outlet chamber 21 and the filter screen mounting through hole 31 are connected, and the water inlet connector 1, the water outlet connector 2 and the filter screen mounting bracket 3 are sealed by the first sealing ring 12 and the second sealing ring 22. The state after fixing the filter screen mounting bracket 3 is as follows. Figure 1 As shown. After the inlet chamber 11, outlet chamber 21 and filter screen mounting hole 31 are connected, water flow can be performed.

[0069] As described above, the automatically replaceable filter of the present invention, by setting up an inlet connector 1, an outlet connector 2, a filter mounting bracket 3, a filter, a mounting bracket drive device 4, a filter removal device 5, and a filter installation device 6, can automatically complete the filter replacement work without human intervention by setting up an inlet connector 1, an outlet connector 2, a filter mounting bracket 3, a filter, a mounting bracket drive device 4, a filter removal device 5, and a filter installation device 6. When the filter needs to be replaced, the mounting bracket drive device 4 drives the filter mounting bracket 3 to move. When the filter mounting bracket 3 moves to the second stop position B, the filter removal device 5 removes the filter from the filter mounting through hole 31. When the filter mounting bracket 3 moves to the third stop position C, the filter installation device 6 installs the spare filter 9 into the filter mounting through hole 31. When the filter mounting bracket 3 moves to the first stop position A, the inlet chamber 11, the outlet chamber 21, and the filter mounting through hole 31 cooperate to form a water flow channel, thereby automatically completing the filter replacement work without human intervention and improving the user experience.

[0070] Second embodiment of the automatically replaceable filter:

[0071] In this embodiment, the only difference between the automatically replaceable filter and the first embodiment is the difference in the movement trajectory of the mounting bracket drive device and the filter mounting bracket. The following description focuses on the differences.

[0072] like Figure 9 As shown, in this embodiment, the mounting bracket driving device adopts an ejector device 40, which can be a cylinder or a hydraulic cylinder. The driving rod 401 of the ejector device 40 is connected to the filter screen mounting bracket 30. The ejector device 40 drives the filter screen mounting bracket 30 to move along the extension and retraction direction of the driving rod 401. The moving trajectory of the filter screen mounting bracket 30 is provided with a first stopping position D, a second stopping position E, and a third stopping position F. The water inlet connector, water outlet connector, filter screen disassembly device, and filter screen installation device provided at the first stopping position D, the second stopping position E, and the third stopping position F of the filter screen mounting bracket 30 can adopt the same structure as in the first embodiment, and the working principle is the same, so it will not be described again here.

[0073] Example of a water purification device:

[0074] In this embodiment, the water purification device is equipped with a filter, which is the automatically replaceable filter screen used in the above embodiment.

[0075] It should be noted that the above are only preferred embodiments of the present invention, but the design concept of the invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept also fall within the protection scope of the present invention.

Claims

1. An automatic replaceable filter screen filter applied to a water purifying device, comprising a water inlet joint, a water outlet joint, a filter screen mounting frame, a filter screen and a joint driving device; characterized in that further comprising a mounting frame driving device, a filter screen dismounting device and a filter screen mounting device, the water inlet joint is provided with a water inlet cavity, the water outlet joint is provided with a water outlet cavity, the filter screen mounting frame is provided with a filter screen mounting through hole, the filter screen is mounted in the filter screen mounting through hole; the mounting frame driving device drives the filter screen mounting frame to move, the first, second and third stop positions are arranged on the moving track of the filter screen mounting frame; when the filter screen mounting frame moves to the first stop position, the water inlet cavity, the water outlet cavity and the filter screen mounting through hole cooperate to form a water flow channel; when the filter screen mounting frame moves to the second stop position, the filter screen dismounting device removes the filter screen in the filter screen mounting through hole; when the filter screen mounting frame moves to the third stop position, the filter screen mounting device mounts a standby filter screen in the filter screen mounting through hole; the joint driving device is connected with the water inlet joint, and the joint driving device drives the opening end of the water inlet cavity to reciprocate relative to the opening end of the water outlet cavity.

2. The automatic replaceable filter screen filter according to claim 1, wherein: the joint driving device comprises a solenoid valve, a spring and a valve core connecting rod, the first end of the valve core connecting rod is connected with the water inlet joint, the second end of the valve core connecting rod is connected with the solenoid valve, the spring is sleeved on the valve core connecting rod, the first end of the spring is in abutment with the water inlet joint, the second end of the spring is in abutment with the solenoid valve, and the solenoid valve controls the telescopic movement of the valve core connecting rod.

3. The automatic replaceable filter screen filter according to claim 1, wherein: the water inlet end of the water inlet joint is connected with a hose.

4. The automatic replaceable filter screen filter according to claim 1, wherein: the filter further comprises a control switch valve, and the control switch valve is mounted on the water inlet end of the water inlet joint.

5. The automatic replaceable filter screen filter according to any one of claims 1 to 4, wherein: the end of the water inlet joint close to the filter screen mounting frame is provided with a first sealing ring, and / or the end of the water outlet joint close to the filter screen mounting frame is provided with a second sealing ring.

6. The automatic replaceable filter screen filter according to any one of claims 1 to 4, wherein: the water outlet joint is provided with a flow sensor, and the flow sensor is mounted in the water outlet cavity.

7. The automatic replaceable filter screen filter according to claim 6, wherein: the water outlet joint is provided with a one-way valve, and the one-way valve is mounted in the water outlet cavity.

8. The automatic replaceable filter screen filter according to any one of claims 1 to 4, wherein: the mounting frame driving device comprises a rotating motor and a connecting rod, the rotating shaft of the rotating motor is connected with the first end of the connecting rod, the rotating shaft of the rotating motor is arranged perpendicularly to the connecting rod, and the second end of the connecting rod is connected with the filter screen mounting frame.

9. The self-replaceable filter screen according to any one of claims 1 to 4, characterized in that: the filter screen dismounting device comprises an ejection device and an ejector rod, the ejection device is connected with the ejector rod; when the filter screen mounting hole moves to the second stop position, the ejector rod is located in the filter screen mounting hole and performs telescopic movement.

10. The self-replaceable filter screen according to claim 9, characterized in that: the ejection device comprises a pneumatic cylinder or a hydraulic cylinder.

11. The self-replaceable filter screen according to any one of claims 1 to 4, characterized in that: the filter screen mounting device comprises a filter screen ejection device and a spare part bin, the outlet of the spare part bin is arranged in cooperation with the filter screen mounting hole, the spare filter screen is located in the spare part bin, and the filter screen ejection device is used to eject the spare filter screen from the spare part bin.

12. The self-replaceable filter screen according to claim 11, characterized in that: the filter screen ejection device comprises a stepper motor, a gear and a rack, the gear is installed on the rotating shaft of the stepper motor, the rack is engaged with the gear, and one end of the rack is in abutment with the spare filter screen.

13. A water purification device provided with a filter; characterized in that: the filter adopts the self-replaceable filter screen according to any one of claims 1 to 12.

14. A working method of a self-replaceable filter screen, applied to a water purification device, characterized in that: the self-replaceable filter screen comprises a water inlet connector, a water outlet connector, a filter screen mounting frame, a filter screen, a mounting frame driving device, a filter screen dismounting device and a filter screen mounting device, the water inlet connector is provided with a water inlet cavity, the water outlet connector is provided with a water outlet cavity, the filter screen mounting frame is provided with a filter screen mounting hole, and the filter screen is mounted in the filter screen mounting hole; the mounting frame driving device drives the filter screen mounting frame to move, and a first stop position, a second stop position and a third stop position are arranged on the moving track of the filter screen mounting frame; when the filter screen mounting frame moves to the first stop position, the water inlet cavity, the water outlet cavity and the filter screen mounting hole cooperate to form a water flow channel; when the filter screen mounting frame moves to the second stop position, the filter screen dismounting device takes out the filter screen in the filter screen mounting hole; when the filter screen mounting frame moves to the third stop position, the filter screen mounting device mounts a spare filter screen in the filter screen mounting hole; the opening end of the water inlet cavity reciprocates relative to the opening end of the water outlet cavity; the method comprises: when it is confirmed that the filter screen needs to be replaced, the opening end of the water inlet cavity is controlled to move away from the opening end of the water outlet cavity, the mounting frame driving device drives the filter screen mounting frame to move to the second stop position, and the filter screen dismounting device takes out the filter screen in the filter screen mounting hole; the mounting frame driving device drives the filter screen mounting frame to move to the third stop position, and the filter screen mounting device mounts a spare filter screen in the filter screen mounting hole. The mounting frame driving device drives the filter screen mounting frame to move to the first stop position, controls the opening end of the water inlet cavity to be close to the opening end of the water outlet cavity, and makes the water inlet cavity, the water outlet cavity and the filter screen mounting through hole cooperate to form a water flow channel.

15. The method of claim 14, wherein: The water outlet connector is provided with a flow sensor, and the flow sensor is installed in the water outlet cavity. The method further comprises: The cumulative water flow is detected through the flow sensor, and when the cumulative water flow is greater than or equal to a preset flow value, it is determined that the filter screen needs to be replaced.

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