Filter for water purifier, water tank assembly and water purifier

Abstract

The utility model discloses a filter for a water purifier, which comprises a filter shell (21) with a second air vent (2111) and a filter screen (22) covering the second air vent (2111), and is characterized in that the covering area of the filter screen (22) is larger than the caliber of the second air vent (2111); the filter further comprises a driving mechanism (25) used for driving the filter screen (22) to move relative to the filter shell (21). The utility model further discloses a water tank assembly and a water purifier applying the filter. Compared with the prior art, the filter for the water purifier can reduce the replacement frequency of the filter screen.

Description

Technical Field

[0001] This utility model relates to the field of water purification equipment technology, specifically to a filter, water tank assembly, and water purifier for use in a water purifier. Background Technology

[0002] Water purifiers generally only have the function of purifying water quality, and the purification speed is relatively slow. Therefore, a water storage tank is needed to store the purified water so that it can quickly meet the water demand when needed.

[0003] The existing water storage tank includes a tank body, a purified water inlet and outlet located on the tank body, and a vent on the top surface of the tank body. A vent pipe is connected to the vent pipe, and a filter screen is installed on the vent pipe. Thus, when purified water is added to the tank, the purified water outlet is closed, causing the volume of air in the upper part of the tank cavity to continuously decrease, and the air inside the tank is discharged to the outside atmosphere through the filter screen. When purified water is discharged, the purified water outlet is opened. Because the flow rate of discharged purified water is greater than the flow rate of purified water entering the tank, the volume of air in the upper part of the tank cavity continuously increases, and outside atmosphere enters the tank through the filter screen. For details, please refer to Chinese patent application number CN201520028924.2, "Water Purifier Storage Tank".

[0004] The function of the filter is to intercept small dust particles in the air. However, when the filter is completely blocked by dust, it may affect the air pressure balance in the water tank, so the filter needs to be replaced, which will affect the user experience. Utility Model Content

[0005] The first technical problem to be solved by this utility model is to provide a filter for water purifiers that can reduce the frequency of filter replacement, in light of the current state of the technology.

[0006] The second technical problem to be solved by this utility model is to provide a filter for a water purifier that can achieve automatic cleaning of the filter screen.

[0007] The third technical problem to be solved by this utility model is to provide a water tank assembly for a water purifier that incorporates the above-mentioned filter.

[0008] The fourth technical problem to be solved by this utility model is to provide a water purifier that uses the above-mentioned water tank assembly.

[0009] The technical solution adopted by this utility model to solve the first technical problem mentioned above is as follows: a filter for a water purifier, comprising a filter housing with a second vent and a filter screen covering the second vent, characterized in that: the covering area of ​​the filter screen is larger than the diameter of the second vent, and the filter further comprises a driving mechanism for driving the filter screen to move relative to the filter housing.

[0010] To further address the second technical problem mentioned above, the surface of the filter screen facing away from the second vent is designated as the contaminated surface. The filter also includes a cleaning component, the cleaning end of which is interference-fitted with the contaminated surface so that it can rub against the contaminated surface during the movement of the filter screen relative to the filter housing.

[0011] To ensure effective cleaning, the cleaning components include:

[0012] The support is fixed relative to the filter housing;

[0013] The mounting base can be movably mounted on the bracket in a direction perpendicular to the contaminated surface;

[0014] A cleaning component, mounted on the mounting base, having its end forming the cleaning end of the cleaning assembly; and

[0015] A first elastic element acts between the mounting base and the bracket to ensure that the end of the cleaning element always tends to have an interference fit with the contaminated surface.

[0016] To ensure the stable movement of the mounting base, the bracket and the mounting base have corresponding guide cylinders and guide rods on their opposite surfaces, and the guide rods can be movably inserted into the corresponding guide cylinders in a direction perpendicular to the contaminated surface.

[0017] To facilitate the installation of the first elastic element, the first elastic element is a compression spring, which is sleeved on the outer periphery of the corresponding guide cylinder and guide rod, and the two ends of the compression spring respectively abut against the opposite surfaces of the bracket and the mounting base.

[0018] Preferably, the cleaning component is a scraper, a rag, a cleaning cotton ball, or a brush.

[0019] To protect the filter, cleaning components, and drive mechanism, the filter housing has an inner cavity, and a third vent is connected to the inner cavity. The second vent is also connected to the inner cavity, and the filter, cleaning components, and drive mechanism are all located within the inner cavity.

[0020] To prevent air leakage around the filter screen, the filter screen is a sponge filter screen. A filter screen cylinder is fitted around the outer periphery of the sponge filter screen. The end face of the filter screen cylinder facing the second vent is sealed to the inner wall of the filter shell located around the second vent through a sealing gasket.

[0021] In order to drive the filter screen to move horizontally, the filter screen cylinder is slidably mounted on the filter housing, and the filter screen has a sliding seat;

[0022] The driving mechanism includes:

[0023] A lead screw extends in the left-right direction and is threaded onto the sliding seat;

[0024] The driving component has its power output shaft coaxially connected to the lead screw to drive the lead screw to rotate.

[0025] In order to drive the filter screen to rotate, the filter screen cylinder is rotatably mounted on the filter housing;

[0026] The driving mechanism includes:

[0027] A D-shaped bushing extends in a direction perpendicular to the contaminated surface and is connected to the filter screen; and

[0028] The driving component has a D-shaped power output shaft that is inserted into the D-shaped bushing to drive the D-shaped bushing to rotate.

[0029] To facilitate the molding and processing of the filter housing, the filter housing includes a base and a top cover on top of the base. The top cover and the base surround and form the inner cavity, and there is a gap between the edge of the top cover and the base to form the third vent.

[0030] To facilitate the collection of dust falling from the contaminated surface, a cylindrical dust collection box with an open top is also included. The dust collection box is installed at the bottom of the filter housing, and the contaminated surface is arranged vertically and faces the open top of the dust collection box.

[0031] To facilitate the removal of the dust collection box for cleaning the dust collected inside, the bottom wall of the filter housing has a downwardly extending connecting cylinder, and the edge of the top of the dust collection box is threaded to the outer periphery of the connecting cylinder.

[0032] To facilitate user observation of the amount of dust collected in the dust collection box, the dust collection box is made of transparent material.

[0033] The technical solution adopted by this utility model to solve the third technical problem mentioned above is: a water tank assembly for a water purifier, comprising a water tank having a purified water inlet, a purified water outlet and a first vent, characterized in that: the above-mentioned filter is applied, and the second vent is in fluid communication with the first vent.

[0034] The technical solution adopted by this utility model to solve the fourth technical problem mentioned above is: a water purifier, characterized in that: it uses the above-mentioned water tank assembly.

[0035] Compared with the prior art, the advantages of this utility model are:

[0036] (1) By setting the coverage area of ​​the filter screen to be larger than the diameter of the second vent, and using a drive mechanism to drive the filter screen to move relative to the filter housing, the filter screen can be moved by the drive mechanism when the filter screen is clogged, so that the unclogged area on the filter screen covers the second vent, reducing the frequency of filter screen replacement.

[0037] (2) By interfering the cleaning end of the cleaning component with the contaminated surface of the filter screen, the filter screen can be made to rub against the contaminated surface during the movement of the filter screen relative to the filter housing, thus achieving automatic cleaning of the filter screen. Attached Figure Description

[0038] Figure 1 This is a three-dimensional structural diagram of the water tank assembly in Embodiment 1 of the water purifier of this utility model;

[0039] Figure 2 for Figure 1 A three-dimensional structural diagram of the filter;

[0040] Figure 3 for Figure 2 The longitudinal sectional view after the top cover is omitted.

[0041] Figure 4 for Figure 2 A schematic diagram of the three-dimensional structure after the top cover is omitted;

[0042] Figure 5 for Figure 4 A three-dimensional structural diagram of the cleaning component;

[0043] Figure 6 This is a longitudinal sectional view of the filter in Embodiment 2 of the water purifier of this utility model, after the top cover has been removed;

[0044] Figure 7 This is a three-dimensional structural diagram of the filter in Embodiment 2 of the present invention, after the top cover has been removed;

[0045] Figure 8 This is a longitudinal sectional view of the water tank in Embodiment 3 of the water purifier of this utility model;

[0046] Figure 9 This is a three-dimensional structural diagram of the filter in Embodiment 3 of the water purifier of this utility model, after the top cover has been removed;

[0047] Figure 10 This is a three-dimensional structural diagram of the filter in Embodiment 4 of the present invention, after the top cover is omitted. Detailed Implementation

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0049] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0050] The term "fluid connectivity" as used in this utility model refers to the spatial relationship between two components or parts (hereinafter referred to as the first part and the second part, respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. The third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

[0051] Example 1:

[0052] like Figures 1 to 5 The image shows a first preferred embodiment of the water purifier of this invention, which incorporates a water tank assembly. The water tank assembly includes a water tank 1, a filter 2, and a filter monitoring device 3.

[0053] The water tank 1 has a purified water inlet 11 and a first vent 13 at the top, and a purified water outlet 12 at the bottom. This is the conventional structure of a water purifier tank, and will not be described in detail here.

[0054] The filter 2 includes a filter housing 21, a filter screen 22, a filter screen cylinder 23, a cleaning component 24, a drive mechanism 25, and a dust collection box 26.

[0055] The filter housing 21 includes a base 211 and a top cover 212 covering the top of the base 211. The top cover 212 and the base 211 surround and form an inner cavity 210. A second vent 2111 communicating with the inner cavity 210 is provided on the front side wall of the base 211. The first vent 13 is connected to the second vent 2111 through a vent pipe 131. A connecting cylinder 2112 extending downward is provided on the bottom wall of the base 211. A limiting frame 2113 is provided inside the base 211. A gap is formed between the top cover 212 and the edge of the base 211 to form a third vent 2121 communicating with the inner cavity 210.

[0056] A filter screen 22 is disposed in the inner cavity 210 and covers the rear side of the second vent 2111, and the coverage area of ​​the filter screen 22 is larger than the diameter of the second vent 2111. Specifically, the rear side of the filter screen 22 is referred to as the contaminated surface 221, which is arranged vertically. In this embodiment, the filter screen 22 is a sponge filter.

[0057] The filter cylinder 23 is fitted around the outer periphery of the filter 22 and installed inside the limiting frame 2113. The end face of the front end of the filter cylinder 23 is sealed to the inner wall of the base 211 located around the second vent 2111 through the sealing gasket 231, so as to prevent air leakage around the filter 22.

[0058] The cleaning component 24 is located in the inner cavity 210 and includes a bracket 241, a mounting base 242, a cleaning component 243, and a first elastic component 244.

[0059] Specifically, the bracket 241 can be slidably mounted on the base 211;

[0060] The mounting base 242 can be movably mounted on the front side of the bracket 241. In this embodiment, the bracket 241 and the mounting base 242 have two sets of corresponding guide cylinders 2411 and guide rods 2421 on their opposite surfaces, and each guide rod 2421 can be movably inserted into the corresponding guide cylinder 2411.

[0061] There are two cleaning components 243, which are installed at intervals along the left and right direction on the front side of the mounting base 242. In this embodiment, the cleaning component 243 is a long strip scraper and is made of soft rubber.

[0062] There are two first elastic elements 244, corresponding one-to-one with the guide cylinders 2411. In this embodiment, each first elastic element 244 is a compression spring, which is sleeved on the outer periphery of the corresponding guide cylinder 2411 and guide rod 2421, and the two ends of the compression spring abut against the opposite surfaces of the bracket 241 and the mounting base 242, so that the end of the cleaning element 243 always tends to have an interference fit with the contaminated surface 221. In this way, on the one hand, the cleaning element 243 can maintain a certain pressure on the filter screen 22, thereby ensuring the cleaning effect; on the other hand, even if the cleaning element 243 wears out after long-term cleaning, it can still maintain a certain interference fit, ensuring the cleaning effect.

[0063] The drive mechanism 25 is located in the inner cavity 210 and includes a lead screw 251a and a drive member 252.

[0064] Specifically, the lead screw 251a extends in the left-right direction and is threaded onto the bracket 241.

[0065] The driving component 252 is a motor, whose power output shaft is coaxially connected to the left end of the lead screw 251a to drive the lead screw 251a to rotate. In turn, the bracket 241 drives the entire cleaning component 24 to move left and right relative to the filter screen 22, so that the end of the cleaning component 243 comes into frictional contact with the contaminated surface 221, thereby scraping and cleaning the contaminated surface 221 and preventing the filter screen 22 from becoming clogged.

[0066] The dust collection box 26 is cylindrical with an open top and is installed at the bottom of the base 211. The contaminated surface 221 is directly opposite the open top of the dust collection box 26, facilitating the collection of dust falling from the contaminated surface 221. In this embodiment, the dust collection box 26 is transparent, allowing the user to easily observe the accumulated dust inside. The edge of the top of the dust collection box 26 is threaded to the outer periphery of the connecting cylinder 2112. Thus, when it is necessary to clean the dust collected inside the dust collection box 26, it is only necessary to unscrew the dust collection box 26, making the operation simple.

[0067] A filter monitoring device 3 is disposed in the inner cavity 210 and is used to monitor the degree of clogging of the filter 22. In this embodiment, the filter monitoring device 3 includes a colorimetric sensor transmitter 31a and a colorimetric sensor receiver 32a arranged one above the other. The colorimetric sensor transmitter 31a is used to emit initial light to the contaminated surface 221, and the colorimetric sensor receiver 32a is used to receive the reflected light from the contaminated surface 221. During operation, the initial color of the filter 22 is selected as white or black. The colorimetric sensor transmitter 31a emits initial white light to the contaminated surface 221, and the colorimetric sensor receiver 32a detects the colorimetric composition of the reflected light. For black, white, and gray colors, the brightness value is generally calculated. Since dust is generally gray, it is possible to detect whether dust has accumulated on the contaminated surface 221, thereby determining the degree of clogging of the filter 22.

[0068] In addition, the filter 2 also has a controller, which is signal-connected to the drive unit 252 and the filter monitoring device 3, so that the controller can receive the signal collected by the filter monitoring device 3 and control the cleaning device composed of the cleaning component 24 and the drive mechanism 25 to clean the contaminated surface 221.

[0069] The working principle of this embodiment is as follows:

[0070] (1) Water storage and release process:

[0071] When purified water is stored in water tank 1: the purified water outlet 12 is closed, so the volume occupied by the air in the upper part of the inner cavity of water tank 1 is continuously reduced. The air in water tank 1 enters the second vent 2111 through the vent pipe 131, enters the inner cavity 210 after being filtered by the filter screen 22, and is finally discharged outward through the third vent 2121.

[0072] When the purified water in the water tank 1 is discharged externally: the purified water outlet 12 is opened. Since the flow rate of the externally discharged purified water is greater than the flow rate of the purified water generated and entering the water tank 1, the volume occupied by the air in the upper part of the inner cavity of the water tank 1 continuously increases. The external atmosphere enters the inner cavity 210 through the third ventilation port 2121, is filtered by the filter screen 22, then enters the water tank 1 through the second ventilation port 211 and the ventilation pipe 131.

[0073] (2) Self-cleaning process:

[0074] The chromaticity sensor receiver 32a continuously detects and calculates the brightness value of the color of the pollution surface 221. Assuming that the filter screen 22 is set to white, its initial brightness value is A0. Through experimental measurement, when the pollution surface 221 is completely covered with dust, the brightness value is A1. Then, a threshold value A2 (A0 > A2 > A1) is set.

[0075] When the real-time brightness value A of the pollution surface 221 < A2, the controller feeds back the signal to the driving member 252. The driving member 252 first rotates forward by a certain angle, that is, the cleaning member 243 first moves leftward by a certain distance, and then rotates in the reverse direction by the same angle, that is, the cleaning member 243 moves rightward by the same distance. This action is repeated. Through the reciprocating translational movement of the cleaning member 243, the scraping and cleaning of the pollution surface 221 can be achieved.

[0076] When the real-time brightness value A of the pollution surface 221 ≥ A2, the controller feeds back the signal to the driving member 252. The driving member 252 rotates to drive the cleaning member 243 to reset to the initial position, and then stops moving.

[0077] Embodiment 2:

[0078] As Figures 6 to 7 shown, this is the second preferred embodiment of the water purifier applied with the water tank assembly of the present invention. The difference from Embodiment 1 is that:

[0079] In this embodiment, the driving mechanism 25 includes a D-shaped shaft sleeve 251b and a driving member 252. Specifically, the D-shaped shaft sleeve 251b extends in the front-rear direction and is connected to the rear side of the bracket 241; the driving member 252 is a motor, and its power output shaft is a D-shaped shaft and is inserted into the D-shaped shaft sleeve 251b to drive the D-shaped shaft sleeve 251b to rotate, and then带动整个清洁组件24相对于滤网22旋转,以使清洁件243的端部与污染面221摩擦接触,实现对污染面221的刮擦清洁,避免滤网22发生堵塞。

[0080] In this embodiment, the cleaning member 243 is an oval-shaped rag, which does not affect the ventilation of the filter screen 22 when stationary, and its cleaning range can cover the entire pollution surface 221 during the rotation process.

[0081] In this embodiment, the filter cylinder 23 is movably installed within the limiting frame 2113.

[0082] In this embodiment, the filter monitoring device 3 includes a pressure sensor 31b and a second elastic element 32b. Specifically, the pressure sensor 31b is mounted on the base 211 and located directly below the filter cylinder 23; the second elastic element 32b is a compression spring, which is arranged vertically, with its two ends abutting against the opposing surfaces of the filter cylinder 23 and the pressure sensor 31b, respectively. During operation, the pressure sensor 31b can detect changes in the weight of the filter 22 through the second elastic element 32b, thus detecting the degree of clogging of the filter 22.

[0083] The working principle of this embodiment is as follows:

[0084] (1) Water storage and discharge process: Same as in Example 1;

[0085] (2) Self-cleaning process:

[0086] Pressure sensor 31b detects the pressure applied by filter 22 in real time. Assuming the initial pressure value is N0, the subsequent real-time pressure value is N1.

[0087] When the weight change value N1-N0 of filter screen 22 is greater than or equal to the preset value B, the controller feeds back the signal to the drive component 252. The drive component 252 drives the cleaning component 243 to rotate 180 degrees counterclockwise and then rotate 180 degrees clockwise and then stop. This action is repeated. The reciprocating rotation of the cleaning component 243 can achieve the scraping and cleaning of the contaminated surface 221.

[0088] When the weight change value N1-N0 of filter 22 is less than the preset value B, the controller feeds back the signal to the drive component 252. The drive component 252 rotates to drive the cleaning component 243 to reset to the initial position, and then stops moving.

[0089] Example 3:

[0090] like Figures 8 to 9 The image shown is a third preferred embodiment of the water purifier with a water tank assembly according to this invention. The difference from Embodiment 1 is that:

[0091] In this embodiment, the water tank 1 has a flow port 14 on the front side; the filter screen 22 has a sliding seat 222 on the rear side; the filter screen cylinder 23 is slidably installed in the limiting frame 2113; and the bracket 241 is fixedly connected to the bottom wall of the inner cavity 210.

[0092] In this embodiment, the drive mechanism 25 includes a lead screw 251a and a drive member 252. Specifically, the lead screw 251a extends in the left-right direction and is threadedly connected to the aforementioned sliding seat 222; the drive member 252 is a motor, whose power output shaft is coaxially connected to the left end of the lead screw 251a to drive the lead screw 251a to rotate, thereby driving the entire filter screen 22 to move left and right relative to the filter housing 21 through the sliding seat 222, so that the end of the cleaning member 243 comes into frictional contact with the contaminated surface 221, thereby scraping and cleaning the contaminated surface 221 and preventing the filter screen 22 from becoming clogged.

[0093] In this embodiment, the cleaning component 243 is a cleaning cotton, and the left and right sides of the end of the cleaning cotton have acute angle structures, which is conducive to the removal of the dust layer from the contaminated surface 221.

[0094] In this embodiment, the filter monitoring device 3 includes a flexible sheet 31c, a magnet 32c, and a Hall sensor 33c. Specifically, the flexible sheet 31c is sealed at the flow port 14 and can be concave or convex depending on the change in air pressure inside the water tank 1; the magnet 32c is mounted on the flexible sheet 31c; the Hall sensor 33c is mounted on the outside of the water tank 1, facing the flow port 14, and can sense the distance between the magnet 32c and the flexible sheet 31c. During operation, the flexible sheet 31c is concave when the air pressure inside the water tank 1 is negative and convex when the air pressure inside the water tank 1 is positive, thereby causing the magnet 32c to move. The Hall sensor 33c can detect the distance between the magnet 32c and the flexible sheet 31c, thereby calculating the distance of the concave or convex movement of the flexible sheet 31c, and then calculating the air pressure value inside the water tank 1, ultimately determining the degree of blockage of the filter 22.

[0095] The working principle of this embodiment is as follows:

[0096] (1) Water storage and discharge process: Same as in Example 1;

[0097] When the filter screen 22 is not clogged, the positive or negative pressure generated by the water storage and discharge processes of the water tank 1 can be quickly cleared to zero, that is, returned to atmospheric pressure, meaning that the magnet 32c is basically in its initial position.

[0098] When filter 22 becomes clogged, the positive or negative pressure generated during the water storage and discharge processes of water tank 1 cannot be cleared to zero, that is, it cannot return to atmospheric pressure. After a certain period of time, magnet 32c will be significantly deviated from its initial position.

[0099] (2) Self-cleaning process:

[0100] Hall sensor 33c monitors the displacement value x of magnet 32c in real time;

[0101] If the absolute value of x within a continuous time period T is greater than or equal to the preset value C, the controller will feed back the signal to the drive unit 252. The drive unit 252 rotates forward or backward a certain number of times, that is, the filter screen 22 moves to the left or right a certain distance. On the one hand, it can ensure that the unblocked area on the filter screen 22 covers the second vent 2111. On the other hand, the translational movement of the filter screen 22, in conjunction with the cleaning unit 243, can achieve the scraping and cleaning of the contaminated surface 221.

[0102] Example 4:

[0103] like Figure 10 The image shown is a fourth preferred embodiment of the water purifier with a water tank assembly according to this utility model. The difference from embodiment 3 is that:

[0104] In this embodiment, the filter cylinder 23 is rotatably installed within the limiting frame 2113.

[0105] In this embodiment, the drive mechanism 25 includes a D-shaped bushing 251b and a drive member 252. Specifically, the D-shaped bushing 251b extends in the front-rear direction and is connected to the rear side of the filter screen 22; the drive member 252 is a motor, and its power output shaft is a D-shaped shaft inserted into the D-shaped bushing 251b to drive the D-shaped bushing 251b to rotate, thereby causing the entire filter screen 22 to rotate relative to the filter housing 21, so that the end of the cleaning member 243 comes into frictional contact with the contaminated surface 221, thereby scraping and cleaning the contaminated surface 221 and preventing the filter screen 22 from becoming clogged.

[0106] In this embodiment, the cleaning component 243 is a brush, which does not affect the airflow of the filter screen 22 when it is stationary, and its cleaning range can cover the entire contaminated surface 221 during rotation.

[0107] In this embodiment, the filter monitoring device 3 includes a light sensor transmitter 31d and a light sensor receiver 32d arranged at intervals on the left and right. The light sensor transmitter 31d is used to emit initial light to the contaminated surface 221, and the light sensor receiver 32d is used to receive the reflected light from the contaminated surface 221. During operation, when the filter 22 is clogged, a certain height of dust will accumulate on its surface. When the accumulated dust exceeds a certain height, it will block the light path of the light sensor, thus identifying the filter as clogged.

[0108] The working principle of this embodiment is as follows:

[0109] (1) Water storage and discharge process: Same as in Example 1;

[0110] (2) Self-cleaning process:

[0111] The optical sensor receiver 32d performs real-time detection and calculation of the optical signal on the contaminated surface 221.

[0112] When the real-time optical signal value A on the contaminated surface 221

Claims

1. A filter for a water purifier, comprising a filter shell (21) having a second air vent (2111) and a filter screen (22) covering the second air vent (2111), characterized in that: The filter screen (22) has a covering area greater than the diameter of the second air vent (2111), and the filter further comprises a driving mechanism (25) for driving the filter screen (22) to move relative to the filter shell (21).

2. The filter of claim 1, wherein: The surface of the filter screen (22) on the side opposite to the second air vent (2111) is referred to as a pollution surface (221), and the filter further comprises a cleaning assembly (24), a cleaning end of the cleaning assembly (24) being in interference fit with the pollution surface (221) so that the cleaning end can be in frictional contact with the pollution surface (221) during the movement of the filter screen (22) relative to the filter shell (21).

3. The filter of claim 2, wherein: The cleaning assembly (24) comprises a bracket (241) fixed relative to the filter shell (21); a mounting seat (242) movably mounted on the bracket (241) in a direction perpendicular to the pollution surface (221); a cleaning member (243) mounted on the mounting seat (242) and having an end forming the cleaning end of the cleaning assembly (24); and a first elastic member (244) acting between the mounting seat (242) and the bracket (241) to make the end of the cleaning member (243) always have a tendency to interfere with the pollution surface (221).

4. The filter of claim 3, wherein: The bracket (241) and the mounting seat (242) have corresponding guide cylinders (2411) and guide rods (2421) on their opposite surfaces, respectively, and the guide rod (2421) is movably inserted into the corresponding guide cylinder (2411) in a direction perpendicular to the pollution surface (221).

5. The filter of claim 4, wherein: The first elastic member (244) is a compression spring, which is sleeved on the outer periphery of the corresponding guide cylinder (2411) and guide rod (2421), and the two ends of the compression spring abut against the opposite surfaces of the bracket (241) and the mounting seat (242), respectively.

6. The filter of claim 3, wherein: The cleaning member (243) is a scraping strip, a cleaning cloth, cleaning cotton or a brush.

7. The filter of claim 2, wherein: The filter shell (21) has an inner cavity (210) therein, and the filter shell (21) has a third air vent (2121) communicating with the inner cavity (210), the second air vent (2111) also communicates with the inner cavity (210), and the filter screen (22), the cleaning assembly (24) and the driving mechanism (25) are all located in the inner cavity (210).

8. The filter of claim 7, wherein: The filter screen (22) is a sponge filter screen, and a filter screen cylinder (23) is sleeved on the outer periphery of the sponge filter screen, and the end face of the filter screen cylinder (23) on the side facing the second air vent (2111) is in sealing fit with the inner wall of the filter shell (21) on the outer periphery of the second air vent (2111).

9. The filter of claim 8, wherein: The filter screen cylinder (23) is slidably mounted on the filter shell (21), and the filter screen (22) has a sliding seat (222); The driving mechanism (25) comprises a lead screw (251a) extending in the left-right direction and being threadedly connected to the sliding seat (222); A driving member (252) is coaxially connected to the screw rod (251a) to drive the screw rod (251a) to rotate.

10. The filter of claim 8, wherein: The filter screen cylinder (23) is rotatably installed on the filter shell (21); The driving mechanism (25) comprises A D-shaped shaft sleeve (251b) extends in a direction perpendicular to the pollution surface (221) and is connected to the filter screen (22); and A driving member (252) is coaxially connected to the screw rod (251a) to drive the screw rod (251a) to rotate.

11. The filter of claim 7, wherein: The filter shell (21) comprises a base (211) and a top cover (212) arranged on the top of the base (211), the inner cavity (210) is formed between the top cover (212) and the base (211), and the third air vent (2121) is formed between the edge of the top cover (212) and the base (211).

12. The filter of any one of claims 2-11, wherein: A dust collecting box (26) is further provided, which is cylindrical and has an open top, and is installed on the bottom of the filter shell (21), the pollution surface (221) is arranged in a vertical direction and faces the open top of the dust collecting box (26).

13. The filter of claim 12, wherein: The bottom wall of the filter shell (21) has a connecting cylinder (2112) extending downward, and the edge of the top of the dust collecting box (26) is threadedly connected to the outer periphery of the connecting cylinder (2112).

14. The filter of claim 12, wherein: The dust collecting box (26) is transparent.

15. A water tank assembly for a water purifier comprising a water tank (1) having a purified water inlet (11), a purified water outlet (12) and a first air vent (13), characterized in that: The filter (2) of any one of claims 1 to 14 is applied, and the second air vent (2111) is in fluid communication with the first air vent (13).

16. A water purifier characterized by: The water tank assembly of claim 15 is applied.

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