Automatic core-changing water purifier and control method thereof

Abstract

The present invention relates to an automatic core-changing water purifier and a control method thereof, belonging to the technical field of water purification equipment. The automatic core-changing water purifier comprises a shell and a filter assembly arranged in the shell, a water inlet pipe and a water outlet pipe are arranged on the shell, the filter assembly is connected in series between the water inlet pipe and the water outlet pipe, the filter assembly comprises a core shell, a filter element, a replacement filter element and an interface seat, the filter element is sleeved in the core shell, the open end of the core shell forms a detachable connection with the interface seat, a support box and a driving mechanism for driving the core shell to deflect are arranged in the shell, a storage mechanism for storing the replacement filter element is arranged on the support box, the filter assembly also comprises an ejection mechanism, and a connection mechanism is arranged at the output end of the storage mechanism. Under the action of the driving mechanism, the core shell is offset, the filter element is ejected by the ejection mechanism into the connection mechanism, and is placed in a waste tank, and the replacement filter element is then placed in the core shell with the help of the connection mechanism to automatically replace the filter element.

Description

Technical Field

[0001] The invention belongs to the technical field of water purification equipment, and in particular relates to an automatic core-changing water purifier and a control method thereof. Background Art

[0002] Water purifiers are commonly used devices for improving water quality in households. Usually, water purifiers are composed of multiple groups of different types of filter cartridges connected in series to achieve higher water purification standards. The problem that follows is that due to the different types of filter cartridges and different wear rates, the filter cartridges are replaced asynchronously, requiring users to replace the filter cartridges frequently, which is cumbersome to use. Many users do not know how to replace the filter cartridges, so they need to find another engineer to replace them on site, which increases the user's maintenance cost. Summary of the invention

[0003] In order to solve the above problems existing in the prior art, the present invention provides an automatic filter cartridge replacement water purifier and a control method thereof, which can realize automatic replacement of the filter cartridge, help reduce the frequency of user self-replacement, and improve user satisfaction.

[0004] The specific technical solution adopted by the present invention is:

[0005] An automatic core-changing water purifier comprises a shell and a filter assembly arranged in the shell, wherein the shell is provided with a water inlet pipe and a water outlet pipe, and the filter assembly is connected in series between the water inlet pipe and the water outlet pipe, and the filter assembly comprises a core shell, a filter element, a replacement filter element and an interface seat, wherein the filter element is sleeved in the core shell, and the core shell is in a barrel-shaped structure, and the open end of the core shell forms a detachable connection with the interface seat, wherein a support box and a driving mechanism for driving the core shell to deflect are arranged in the shell, and a storage mechanism for storing replacement filter elements is arranged on the support box, and the filter assembly also comprises an ejection mechanism, and a connection mechanism is arranged at the output end of the storage mechanism, and the core shell has the freedom to swing from the interface seat to the connection mechanism with the help of the driving mechanism, and the filter element is moved to the opening of the core shell and enters the connection mechanism with the help of the ejection mechanism.

[0006] The driving mechanism includes a screw assembly arranged at the bottom of the shell and limit plates arranged on both sides of the core shell. The screw assembly includes a rotating screw driven by a first motor and a movable screw sleeve threadedly connected to the rotating screw. The movable screw sleeve is hingedly connected to the core shell. The limit groove is arranged on the limit plate, and the core shell is provided with a limit rod slidably connected to the limit groove.

[0007] The storage mechanism comprises a storage conveyor belt arranged above the support box and partitions arranged on both sides of the conveyor belt. The replacement filter element has the freedom to translate toward the connection mechanism by virtue of the rotation of the storage conveyor belt.

[0008] The connecting mechanism includes a connecting groove with an arc-shaped cross-section and a connecting conveyor belt arranged on the opening side of the connecting groove. The connecting conveyor belt is driven to rotate by a second motor. The second motor is arranged on the outer wall of the connecting groove. A hinge shaft is fixedly arranged on the connecting groove. The connecting groove is hinged to the edge of the support box by means of the hinge shaft. The hinge shaft is connected to a third motor. The connecting groove is driven by the third motor and has the freedom to swing relative to the support box.

[0009] The ejection mechanism is an ejection piston arranged in the core shell. The cavity surrounded by the ejection piston and the bottom of the core shell is connected to an ejection water pump by means of a through hole penetrating the side wall of the core shell. A reset spring is also arranged between the ejection piston and the bottom of the core shell. The ejection piston has the freedom to move up and down along the inner wall of the core shell by means of water supply from the ejection water pump and the tension of the reset spring.

[0010] A concave connecting groove is arranged on the inner wall of the opening side of the core shell, the length of which is greater than the thickness of the ejection piston. When the ejection piston passes through the connecting groove, the two ends of the connecting groove are respectively located on the upper and lower sides of the piston.

[0011] A lifting assembly is provided between the rotating screw and the core shell, and the lifting assembly includes a lower top wedge arranged on the movable screw sleeve and an upper top wedge fixed to the bottom of the core shell. The upper top wedge and the lower top wedge are wedge-shaped, and the wedge tips of the two are arranged facing each other. When the movable screw sleeve moves, the upper top wedge is lifted up with the help of the lower top wedge. Raised sliding rods are provided on both sides of the lower top wedge, and the sliding rods form a limiting fit with the sliding grooves arranged on both sides of the upper top wedge.

[0012] The filter element is fitted with a limiting assembly outside the filter element, and the limiting assembly includes a limiting ring fitted with the filter element and a limiting block arranged on the limiting ring. The limiting block is arranged around the limiting ring in a spoke shape, and the limiting block is supported by the inner wall of the core shell and forms a sliding connection. The filter element is coaxially arranged with the core shell with the help of the limiting assembly.

[0013] The interface seat is coaxially provided with an inner ring and an outer ring, the inner ring presses against the filter element and forms a sealed connection with the filter element, the outer ring presses against the core shell opening to form a sealed connection, the inner ring is provided with a post-filtration water inlet, the outer ring is provided with a pre-filtration water inlet, the filter element and the core shell are respectively sealed with the inner ring and the outer ring to form a pre-filtration cavity located on the outside of the filter element and a post-filtration cavity located on the inside of the filter element, the pre-filtration water inlet is connected to the pre-filtration cavity, and the post-filtration water inlet is connected to the post-filtration cavity.

[0014] A control method for an automatic core-changing water purifier includes the automatic core-changing water purifier and a controller. The control method includes the following steps:

[0015] S1. The controller monitors the filter element loss according to the preset parameters. When the filter element reaches the preset parameters, the stop valves set on the water inlet pipe and the water outlet pipe are driven to shut off;

[0016] S2. The first motor is powered on and rotates forward, driving the movable screw sleeve to move, and the filter element assembly moves from a vertical state to an inclined state, and the filter element assembly is separated from the interface seat;

[0017] S3. The ejection mechanism performs an ejection action to eject the filter element out of the core housing;

[0018] S4. The ejector mechanism performs a descending action to load the replacement filter element into the core housing;

[0019] S5. After the filter element to be replaced is placed in, the first motor is powered on and reversed, so that the filter assembly swings back and reconnects with the interface seat, and the stop valves on the water inlet pipe and the water outlet pipe are opened to complete the replacement of the filter element.

[0020] In step S3, the ejection action of the ejection mechanism is that the ejection water pump injects water into the piston cavity between the core shell and the ejection piston, the ejection piston moves upward to eject the filter element, the ejected filter element enters the connection mechanism, the second motor is powered on and rotated, and the filter element is clamped upward and entered into the connection mechanism with the help of the connection conveyor belt, the third motor drives the connection mechanism to swing into the waste tank set on the rear side of the filter assembly, the second motor reverses to discharge the filter element from the connection assembly, the third motor reverses to drive the connection mechanism to reset, and the above operation is repeated until the filter element is completely discharged.

[0021] The descending action of the ejection mechanism in step S4 is that the piston chamber of the core shell and the ejection piston is connected to the drain pipe by means of a stop valve, the storage conveyor belt rotates to send the pre-placed replacement filter element into the connecting mechanism, the second motor reverses to press the replacement filter element into the cavity of the core shell by means of the connecting conveyor belt, and the above operation is repeated until the number of replacement filter elements loaded is sufficient.

[0022] The beneficial effects of the present invention are:

[0023] The present invention adds a storage mechanism and a filter assembly inside the core shell, relies on a driving mechanism and a connecting mechanism to automatically place the filter element to be replaced into a waste tank, and then places the replacement filter element into the core shell. The various mechanisms cooperate to achieve automatic replacement of the filter element, thereby avoiding the trouble of users frequently replacing the filter element by themselves, and eliminating the need for users to find another engineer to replace the filter element on site, thus saving maintenance costs, reducing maintenance difficulty, and improving user satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the front side of the automatic core-changing water purifier;

[0025] Figure 2 It is a cross-sectional schematic diagram of the side of the automatic core-changing water purifier;

[0026] Figure 3 It is a structural schematic diagram when the filter element is pushed out of the core shell;

[0027] Figure 4 A schematic diagram of the structure for placing the filter element into the waste tank for the connection structure;

[0028] Figure 5 A schematic diagram of the structure for placing a replacement filter element into the core housing for the connection structure;

[0029] Figure 6 A half-section schematic diagram of a filter assembly;

[0030] Figure 7 It is a schematic diagram of the cross section of the filter component AA;

[0031] Figure 8 It is a side view of the limiting plate;

[0032] Fig. 9 It is a schematic diagram of the structure of the cooperation between the limit groove and the upper limit rod on the core shell;

[0033] Fig.10 It is a schematic diagram of the connection mechanism;

[0034] Fig.11 for Fig. 9 An enlarged schematic diagram of the lifting assembly in the middle.

[0035] 1. Core shell, 2. Filter element, 3. Replacement filter element, 4. Interface seat, 5. Support box, 6. Limit plate, 7. Rotating screw, 8. Moving screw sleeve, 9. Limit groove, 10. Limit rod, 11. Storage conveyor belt, 12. Partition, 13. Connecting groove, 14. Connecting conveyor belt, 15. Articulated shaft, 16. Ejector piston, 17. Reset tension spring, 18. Connecting groove, 19. Upper top wedge, 20. Lower top wedge, 21. Limit ring, 22. Limit block. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0037] like Figures 1 to 5As shown, the present invention discloses an automatic core-changing water purifier, comprising a shell and a filter assembly arranged in the shell, the shell being provided with a water inlet pipe and a water outlet pipe, the filter assembly being connected in series between the water inlet pipe and the water outlet pipe, the filter assembly comprising a core shell 1, a filter element 2, a replacement filter element 3 and an interface seat 4, the filter element 2 being sleeved in the core shell 1, the core shell 1 being in a barrel-shaped structure, the open end of the core shell 1 being detachably connected with the interface seat 4, a support box 5 and a driving mechanism for driving the core shell 1 to deflect are arranged in the shell, a storage mechanism for storing the replacement filter element 3 is arranged on the support box 5, the filter assembly further comprises an ejection mechanism, a connection mechanism is arranged at the output end of the storage mechanism, the core shell 1 has the freedom to swing from the interface seat 4 to the connection mechanism with the aid of the driving mechanism, the filter element 2 is moved to the opening of the core shell 1 with the aid of the ejection mechanism and enters the connection mechanism.

[0038] like Figures 3 to 5 As shown, the working principle of the present invention is to deflect the filter assembly and separate it from the interface seat 4 with the help of a driving mechanism, so that the filter element 2 is exposed, and then the ejection mechanism ejects the filter element 2 to the connecting mechanism. At this time, the connecting mechanism grasps the waste filter element 2 and swings it to the waste tank to discharge the waste filter element. After completion, the storage mechanism puts the replacement filter element 3 into the connecting mechanism, and the connecting mechanism puts it back into the core shell 1, and then the driving mechanism is reversed to reset the filter element assembly.

[0039] The support box 5 is a hollow structure, used to store the controller, the water pump driving the ejection mechanism, and the water supply pump used to pressurize the filter pipelines traveled by the water inlet pipe, the water outlet pipe and the filter elements connected in series. A clean water tank is also provided for storing the clean water after filtration.

[0040] like Figure 2 , Figure 3 , Figure 8 and Fig. 9 As shown, the driving mechanism includes a screw assembly arranged at the bottom of the shell and a limit plate 6 arranged in a mirror-like manner on both sides of the core shell 1. The screw assembly includes a rotating screw 7 driven by a first motor and a movable screw sleeve 8 threadedly connected to the rotating screw 7. The movable screw sleeve 8 is hingedly connected to the core shell 1. A limit groove 9 is arranged on the limit plate 6, and a limit rod 10 slidably connected to the limit groove 9 is arranged on the core shell 1.

[0041] When the drive mechanism is Figure 3 and Fig. 9 As shown, when the movable screw sleeve 8 moves to the left with the help of the rotation of the rotating screw 7, the filter assembly swings, and at this time, the limiting rod 10 on the core shell 1 moves along the limiting groove 9, so that the core shell 1 completes the swing smoothly.

[0042] The limiting rods 10 are provided in two groups on the upper and lower sides of the core shell 1, and the limiting grooves 9 are also provided in two groups. The upper limiting grooves 9 are angled, one of which is along the vertical direction and the other is inclined in the tilting direction of the filter assembly. The lower limiting grooves 9 are straight vertical shapes.

[0043] like Figure 5 As shown, the storage mechanism includes a storage conveyor belt 11 arranged above the support box 5 and partitions 12 arranged on both sides of the conveyor belt. The replacement filter element 3 has the freedom to translate toward the connection mechanism by virtue of the rotation of the storage conveyor belt 11.

[0044] The storage mechanism is manually stored by the user in advance for replacing the filter element 3, thereby avoiding the user having to pay attention to the replacement timing and reducing the difficulty of maintenance.

[0045] Further, such as Figure 2 and Figure 4 As shown, the connecting mechanism includes a connecting groove 13 with an arc-shaped cross-section and a connecting conveyor belt 14 arranged on the opening side of the connecting groove 13, the connecting conveyor belt 14 is driven to rotate by a second motor, the second motor is arranged on the outer wall of the connecting groove 13, and a hinge shaft 15 is fixedly provided on the connecting groove 13. The connecting groove 13 is hinged to the edge of the support box 5 by means of the hinge shaft 15, and the hinge shaft 15 is connected to a third motor. The connecting groove 13 is driven by the third motor to have the freedom to swing relative to the support box 5.

[0046] The connecting groove 13 is arc-shaped and is used to fit and grasp the filter element 2. The belt surface of the connecting conveyor belt 14 is provided with a raised friction rod made of rubber. The friction rod is used to frictionally limit the filter element 2 so that the filter element 2 can move up and down in the connecting groove 13.

[0047] like Figure 2 and Figure 6 As shown, the ejection mechanism is an ejection piston 16 arranged in the core shell 1, and the cavity surrounded by the ejection piston 16 and the bottom of the core shell 1 is connected to the ejection water pump by means of a through hole penetrating the side wall of the core shell 1, and a reset spring 17 is also arranged between the ejection piston 16 and the bottom of the core shell 1. The ejection piston 16 has the freedom to move up and down along the inner wall of the core shell 1 with the help of water supply from the ejection water pump and the tension of the reset spring 17.

[0048] The water inlet end of the ejector water pump is connected to the clean water tank, or is connected to the water inlet pipe and is arranged at the front end of the stop valve of the water inlet pipe. The through holes on the side wall of the core shell 1 are respectively connected to two stop valves by means of pipelines, one of which is connected in series to the output end of the ejector water pump, and the other is connected to the drain pipe. When the ejector water pump is working, the stop valve connected in series to the output end of the ejector water pump is opened, and the stop valve connected to the drain pipe is closed. Water is sent by the ejector water pump into the piston cavity surrounded by the core shell 1 and the ejector piston 16, so that the ejector piston 16 moves up to eject the filter element 2. When the ejector piston 16 needs to descend, the stop valve connected to the drain pipe is opened, and the stop valve at the output end of the ejector water pump is closed. Under the pulling force of the reset tension spring 17, the ejector piston 16 descends, and the water in the piston cavity is discharged through the drain pipe. The ejector piston 16 carries the replacement filter element 3 into the core shell 1.

[0049] The ejection piston 16 has two functions. One is to eject the filter element 2 or to carry the replacement filter element 3 to slide into the core housing 1 by moving, and the other is to scrape the side wall of the core housing 1 to clean it.

[0050] like Figure 6 As shown, a concave connecting groove 18 is provided on the inner wall of the opening side of the core shell 1, and the length of the connecting groove 18 is greater than the thickness of the ejection piston 16. When the ejection piston 16 passes through the connecting groove 18, the two ends of the connecting groove 18 are respectively located on the upper and lower sides of the piston.

[0051] When the ejection piston 16 moves to the connecting groove 18, the connecting groove 18 is connected to the piston cavity to release pressure, and the water in the piston cavity rushes out from above the connecting groove 18 to rinse and clean the upper side of the piston cavity. At the same time, due to the leakage of the piston cavity, the ejection piston 16 is limited under the traction of the pressure return tension spring 17.

[0052] like Figure 3 and Fig. 9 As shown, a lifting assembly is arranged between the rotating screw 7 and the core shell 1, and the lifting assembly includes a lower top wedge 20 arranged on the movable screw sleeve 8 and an upper top wedge 19 fixed to the bottom of the core shell 1. The upper top wedge 19 and the lower top wedge 20 are both wedge-shaped, and the wedge tips of the two are arranged facing each other. When the movable screw sleeve 8 moves, the upper top wedge 19 is lifted up with the help of the lower top wedge 20. Raised sliding rods are arranged on both sides of the lower top wedge 20. The sliding rods and the sliding grooves arranged on both sides of the upper top wedge 19 form a limiting fit, and the sliding grooves are arranged along the inclination direction of the inclined surface of the upper top wedge 19.

[0053] With the help of the upper wedge 19 and the lower wedge 20, the filter assembly rises in the last stroke when it is reset, so that it is inserted into the interface seat.

[0054] When the lower top wedge 20 pushes the upper top wedge 19 to reset, Fig.11As shown, an inclined upward section is provided at the end of the slide groove. When the lower top wedge 20 moves to the left, the slide rod is stuck in the upward section of the slide groove, so that the upper top wedge 19 moves to the left along with the lower top wedge 20. Since the upper limiting groove 9 is the limit of the inclined section at this time, the filter assembly only swings in the reset direction.

[0055] When the filter assembly is pulled out from the interface seat 4, since the limiting grooves 9 are all vertical sections at this time, after the lower top wedge 20 moves, the upper top wedge 19 moves vertically downward under the limiting cooperation of the slide rod and the slide groove, thereby realizing the pulling out of the filter assembly. Figure 3 and Fig. 9 shown.

[0056] The upper jack wedge 19 is connected to the bottom of the core shell 1 by means of a bendable torsion bar, so that the jacking assembly and the core shell 1 are smoothly connected.

[0057] Further, such as Fig. 9 and Fig.10 As shown, the filter element 2 is provided with a limiting assembly on the outside, and the limiting assembly includes a limiting ring 21 which is fitted with the filter element 2 and a limiting block 22 arranged on the limiting ring 21. The limiting block 22 is arranged around the limiting ring 21 in a spoke shape, and the limiting block 22 is supported by the inner wall of the core shell 1 and forms a sliding connection. The filter element 2 is coaxially arranged with the core shell 1 with the help of the limiting assembly.

[0058] The coaxial arrangement of the limiting assembly can better fix the position of the filter element 2 and prevent the filter element 2 from shifting during the sliding process.

[0059] The filter element 2 and the replacement filter element 3 have the same structure, both including a tubular filter material and a limit assembly outside the filter material. Two filter materials are stacked up and down in the same core shell 1, and a sealing ring is arranged on the end surface of the filter material to improve the sealing performance.

[0060] like Figure 6 As shown, the interface seat 4 is coaxially provided with an inner ring and an outer ring, the inner ring presses against the filter element 2 and forms a sealed connection with the filter element 2, the outer ring presses against the opening of the core shell 1 to form a sealed connection, the inner ring is provided with a post-filtration water inlet, the outer ring is provided with a pre-filtration water inlet, the filter element 2 and the core shell 1 are respectively sealed with the inner ring and the outer ring to form a pre-filtration cavity located on the outside of the filter element 2 and a post-filtration cavity located on the inside of the filter element 2, the pre-filtration water inlet is connected to the pre-filtration cavity, and the post-filtration water inlet is connected to the post-filtration cavity.

[0061] The setting of the inner and outer rings enhances the overall sealing of the filter element and realizes the separation of the pre-filter cavity and the post-filter cavity. The setting of the pre-filter water inlet and the post-filter water inlet facilitates the series connection of the filter components.

[0062] A control method for an automatic core-changing water purifier includes the automatic core-changing water purifier and a controller. The control method includes the following steps:

[0063] S1. The controller monitors the loss of the filter element 2 according to the preset parameters. When the filter element 2 reaches the preset parameters, the controller electrically drives the stop valves set on the water inlet pipe and the water outlet pipe to be cut off;

[0064] The preset parameter is a preset time, or a water quality parameter measurable by a water quality sensor, or a filter element filtering flow parameter measured by a flow sensor.

[0065] S2. The controller drives the first motor to rotate forward, the first motor drives the movable screw sleeve 8 to move, the filter element assembly moves from the vertical state to the inclined state, and the filter element assembly is separated from the interface seat 4;

[0066] S3. The ejection mechanism performs an ejection action to discharge the filter element 2 from the core housing 1;

[0067] S4. The ejection mechanism performs a descending action to load the replacement filter element 3 into the core housing 1;

[0068] S5. After the filter element 3 to be replaced is placed in, the first motor is powered on and reversed, so that the filter assembly swings back and reconnects with the interface seat 4, and the stop valves on the water inlet pipe and the water outlet pipe are opened, and the replacement filter element 3 is completed.

[0069] In the step S3, the ejection action of the ejection mechanism is that the ejection water pump is powered on to inject water into the piston cavity between the core shell 1 and the ejection piston 16, the ejection piston 16 moves up to eject the filter element 2, the connecting mechanism is pre-deflected in place, the ejected filter element 2 enters the connecting mechanism, the second motor of the connecting mechanism is powered on and rotated, and the filter element 2 is clamped upward by the connecting conveyor belt 14 and enters the connecting mechanism, the third motor drives the connecting mechanism to swing into the waste tank set on the rear side of the filter assembly, the second motor reverses to discharge the filter element 2 from the connecting assembly, the third motor reverses to drive the connecting mechanism to reset, and the above operation is repeated until the filter element 2 is completely discharged, and then the ejection water pump is powered off after a delay of 2-3s. During the delay period, the connecting groove 18 is connected, and the upper surface of the ejection piston 16 is flushed.

[0070] The descending action of the ejection mechanism in step S4 is that the piston chamber of the core shell 1 and the ejection piston 16 is connected to the drain pipe by means of a stop valve, the storage conveyor belt 11 rotates to send the pre-placed replacement filter element 3 into the connecting mechanism, and the second motor reverses to press the replacement filter element 3 into the cavity of the core shell 1 by means of the connecting conveyor belt 14, and the above operation is repeated until the number of replacement filter elements 3 loaded is sufficient.

Claims

1. An automatic core-changing water purifier, comprising a housing and a filter assembly arranged in the housing, wherein the housing is provided with a water inlet pipe and a water outlet pipe, wherein the filter assembly is connected in series between the water inlet pipe and the water outlet pipe, wherein the filter assembly comprises a core housing (1), a filter element (2), a replacement filter element (3) and an interface seat (4), wherein the filter element (2) is sleeved in the core housing (1), wherein the core housing (1) is in a barrel-shaped structure, wherein an open end of the core housing (1) is detachably connected to the interface seat (4), and wherein: A support box (5) and a driving mechanism for driving the core housing (1) to deflect are arranged in the housing, a storage mechanism for storing replacement filter elements (3) is arranged on the support box (5), the filter assembly further comprises an ejection mechanism, an engagement mechanism is arranged at the output end of the storage mechanism, the core housing (1) has the freedom to swing from the interface seat (4) to the engagement mechanism by means of the driving mechanism, and the filter element (2) moves to the opening of the core housing (1) by means of the ejection mechanism and enters the engagement mechanism; The driving mechanism comprises a screw assembly arranged at the bottom of the shell body and limit plates (6) arranged on both sides of the core shell (1), the screw assembly comprises a rotating screw (7) driven by a first motor and a movable screw sleeve (8) threadedly connected to the rotating screw (7), the movable screw sleeve (8) is hingedly connected to the core shell (1), the limit plate (6) is provided with a limit groove (9), and the core shell (1) is provided with a limit rod (10) slidably connected to the limit groove (9); The storage mechanism comprises a storage conveyor belt (11) arranged above the support box (5) and partitions (12) arranged on both sides of the conveyor belt, and the replacement filter element (3) has the freedom to translate toward the connection mechanism by virtue of the rotation of the storage conveyor belt (11); The connection mechanism comprises a connection groove (13) having an arc-shaped cross section and a connection conveyor belt (14) arranged on the opening side of the connection groove (13); the connection conveyor belt (14) is driven to rotate by a second motor; the second motor is arranged on the outer side wall of the connection groove (13); a hinge shaft (15) is fixedly arranged on the connection groove (13); the connection groove (13) is hinged to the edge of the support box (5) by the hinge shaft (15); the hinge shaft (15) is connected to a third motor; the connection groove (13) is driven by the third motor to have the freedom to swing relative to the support box (5); The ejection mechanism is an ejection piston (16) arranged in the core shell (1); the cavity enclosed by the ejection piston (16) and the bottom of the core shell (1) is connected to an ejection water pump by means of a through hole penetrating the side wall of the core shell (1); a return tension spring (17) is also arranged between the ejection piston (16) and the bottom of the core shell (1); the ejection piston (16) has the freedom to move up and down along the inner wall of the core shell (1) by means of water supply from the ejection water pump and the tension of the return tension spring (17).

2. The automatic core-changing water purifier according to claim 1, characterized in that: A concave connecting groove (18) is provided on the inner wall of the opening side of the core shell (1), the length of the connecting groove (18) is greater than the thickness of the ejection piston (16), and when the ejection piston (16) passes through the connecting groove (18), the two ends of the connecting groove (18) are respectively located on the upper and lower sides of the piston.

3. The automatic core-changing water purifier according to claim 1, characterized in that: A lifting assembly is provided between the rotating screw (7) and the core shell (1), and the lifting assembly includes a lower top wedge (20) provided on the movable screw sleeve (8) and an upper top wedge (19) fixed to the bottom of the core shell (1). The upper top wedge (19) and the lower top wedge (20) are wedge-shaped, and the wedge tips of the two are arranged facing each other. When the movable screw sleeve (8) moves, the upper top wedge (19) is lifted up with the help of the lower top wedge (20). Raised sliding rods are provided on both sides of the lower top wedge (20), and the sliding rods form a limit fit with the sliding grooves provided on both sides of the upper top wedge (19).

4. The automatic core-changing water purifier according to claim 1, characterized in that: The filter element (2) is provided with a limit assembly mounted on the outside, the limit assembly comprising a limit ring (21) mounted on the filter element (2) and a limit block (22) arranged on the limit ring (21), the limit block (22) being arranged around the limit ring (21) in a spoke shape, the limit block (22) being supported by the inner wall of the core shell (1) and forming a sliding connection, and the filter element (2) is coaxially arranged with the core shell (1) by means of the limit assembly.

5. The automatic core-changing water purifier according to claim 1, characterized in that: The interface seat (4) is coaxially provided with an inner layer ring and an outer layer ring, the inner layer ring presses against the filter element (2) and forms a sealed connection with the filter element (2), the outer layer ring presses against the opening of the core shell (1) to form a sealed connection, the inner layer ring is provided with a post-filter water inlet, the outer layer ring is provided with a pre-filter water inlet, the filter element (2) and the core shell (1) are respectively sealed with the inner layer ring and the outer layer ring to form a pre-filter cavity located outside the filter element (2) and a post-filter cavity located inside the filter element (2), the pre-filter water inlet is connected to the pre-filter cavity, and the post-filter water inlet is connected to the post-filter cavity.

6. A control method for an automatic core-changing water purifier, characterized in that: The automatic cartridge-changing water purifier according to claim 1 further comprises a controller, wherein the control method comprises the following steps: S1. The controller monitors the loss of the filter element (2) according to preset parameters, and when the filter element (2) reaches the preset parameters, drives the stop valves arranged on the water inlet pipe and the water outlet pipe to stop; S2. The first motor is powered on and rotates forward, driving the movable screw sleeve (8) to move, and the filter element assembly moves from a vertical state to an inclined state, and the filter element assembly is separated from the interface seat (4); S3. The ejection mechanism performs an ejection action to eject the filter element (2) out of the core housing (1); S4. The ejection mechanism performs a descending action to load the replacement filter element (3) into the core housing (1); S5. After the filter element (3) to be replaced is inserted, the first motor is powered on and reversed, so that the filter assembly swings back and reconnects with the interface seat (4), and the stop valves on the water inlet pipe and the water outlet pipe are opened, thereby completing the replacement of the filter element (3).

7. The control method of the automatic cartridge-changing water purifier according to claim 6, characterized in that: In step S3, the ejection action of the ejection mechanism is that the ejection water pump injects water into the piston cavity between the core housing (1) and the ejection piston (16), the ejection piston (16) moves upward to eject the filter element (2), the ejected filter element (2) enters the connection mechanism, the second motor is powered on and rotates, and the filter element (2) is clamped upward by the connection conveyor belt (14) and enters the connection mechanism, the third motor drives the connection mechanism to swing into the waste tank arranged at the rear side of the filter assembly, the second motor reverses to eject the filter element (2) from the connection assembly, the third motor reverses to drive the connection mechanism to reset, and the above operation is repeated until the filter element (2) is completely ejected.

8. The control method of the automatic cartridge-changing water purifier according to claim 6, characterized in that: The descending action of the ejection mechanism in step S4 is that the piston chamber of the core housing (1) and the ejection piston (16) are connected to the drain pipe by means of a stop valve, the storage conveyor belt (11) rotates to deliver the pre-placed replacement filter element (3) into the connection mechanism, the second motor reverses to press the replacement filter element (3) into the cavity of the core housing (1) by means of the connection conveyor belt (14), and the above operation is repeated until a sufficient number of replacement filter elements (3) are loaded.

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