Liquid filter

Abstract

The invention discloses a liquid filter, and relates to the technical field of filtering equipment, the liquid filter comprises a tank body, a water inlet pipe, a water outlet pipe and a filtering device, the tank body is internally provided with a cavity, the liquid filter also comprises a fixing plate, and the fixing plate is located in the cavity and is fixedly connected with the tank body; the filtering device comprises a bent filtering pipe, the filtering pipe is located above the fixing plate, and the two ends of the filtering pipe are fixedly connected with the fixing plate; a plurality of first filtering holes are formed in the filtering pipe; one end, close to the tank body, of the water inlet pipe extends into the cavity, is connected with the fixing plate and is communicated with one end of the internal space of the filter pipe; the fixing plate is provided with a water outlet which enables the upper space and the lower space of the fixing plate to be communicated, and the end, close to the tank body, of the water outlet pipe is connected with the bottom of the tank body and located below the water outlet. The filtering device has high filtering efficiency, and can stably and effectively filter liquid.

Description

Technical Field

[0001] The present application relates to the technical field of filtering equipment, and in particular to a liquid filter. Background Art

[0002] Liquid filters are devices used to remove solid particles, microorganisms, suspended matter or other impurities from liquids to ensure the cleanliness of the liquid or to meet specific purity standards. They are widely used in water treatment, chemical, pharmaceutical, food and beverage, oil and gas and other industries.

[0003] Existing liquid filters usually include a tank body, a water inlet pipe, a water outlet pipe and a filter device. The filter device is installed in a cavity inside the tank body. The end of the water inlet pipe is located in the cavity and communicates with the internal space of the filter device, while the end of the water outlet pipe communicates with the space in the cavity outside the filter device.

[0004] During use, the liquid enters the cavity through the water inlet pipe, is filtered by the filter device, and then enters the space outside the filter device in the cavity, and is then discharged through the water outlet pipe to obtain the filtered liquid.

[0005] However, in existing liquid filters, the water inlet and outlet pipes are usually installed at the bottom of the tank body. The liquid to be filtered entering the cavity needs to maintain a certain liquid level height so that the filter device can be fully utilized, that is, the filter device can fully filter the liquid.

[0006] Therefore, the existing liquid filter has a poor filtering efficiency for liquid, and there is an urgent need for a liquid filter with high filtering efficiency and stable effect. Summary of the Invention

[0007] The present application provides a liquid filter, which has a high filtration efficiency and can stably and effectively filter liquids.

[0008] This application provides a liquid filter, which adopts the following technical solution: A liquid filter comprises a tank body, a water inlet pipe, a water outlet pipe and a filter device, wherein the tank body has a cavity for the filter device to be arranged therein, and further comprises a fixing plate, wherein the fixing plate is located in the cavity and fixedly connected to the tank body; The filtering device includes a curved filter tube, the filter tube is located above the fixed plate, and both ends of the filter tube are fixedly connected to the fixed plate; a plurality of first filter holes are formed on the filter tube, and the space inside the filter tube can communicate with the space outside the filter tube through the first filter holes; One end of the water inlet pipe close to the tank body extends into the cavity and is connected to the fixed plate, and is communicated with one end of the internal space of the filter tube; a water outlet is provided on the fixed plate to communicate with the space above and below the fixed plate, and one end of the water outlet pipe close to the tank body is connected to the bottom of the tank body and is located below the water outlet.

[0009] By adopting the above technical solution, after the liquid enters the cavity through the water inlet pipe, it can enter the space above the fixed plate through the water filter pipe, and be filtered by the water filter pipe and then discharged through the water outlet and the water outlet pipe in succession; the liquid entering the space above the fixed plate from the inside of the water filter pipe can be filtered in a timely and sufficient manner, and at the same time, the liquid in the space above the fixed plate can also be filtered by the water filter pipe in the process of passing through the water outlet, so that the liquid filter has a higher filtration efficiency and can stably and effectively filter the liquid.

[0010] Optionally, a supporting device is further included, wherein the supporting device includes a positioning frame, and both ends of the positioning frame are respectively connected to the filter tube and the fixing plate.

[0011] By adopting the above technical solution, the position stability of the filter tube in the space above the fixed plate can be improved, so that the filter tube can stably and effectively filter the liquid.

[0012] Optionally, the filter tube is a hose that can be bent and deformed, and the aperture of the first filter hole can be reduced after bending and deformation; the positioning frame is provided with a sleeve, and the sleeve is fitted with the middle part of the filter tube, and the outer surface of the middle part of the filter tube is in contact with the inner surface of the sleeve and is fixedly connected.

[0013] By adopting the above technical solution, the filter tube will bend and deform under the force of the liquid when the flow rate is large, which can reduce the probability of the filter tube being deformed and damaged after being subjected to the force, and extend the service life of the filter tube; at the same time, the aperture of the first filter hole on the bent and deformed filter tube will be reduced, thereby enhancing its filtering effect on the liquid.

[0014] Optionally, the supporting device further includes a movable member and a first elastic member, wherein the movable member is disposed in the water outlet and movably connected to the fixed plate, and a movable direction of the movable member is parallel to a height direction of the tank body; The movable member is provided with a plurality of water diversion openings in the water outlet, and the space above the fixed plate can communicate with the space below the fixed plate through the water diversion openings; The two ends of the first elastic member are respectively connected to the movable member and the fixed plate, and have a tendency to drive the movable member to move toward the filter tube to an extreme position and maintain the position.

[0015] By adopting the above technical solution, when the liquid flow in the cavity is large, the liquid passing through the water outlet can drive the movable part to overcome the force of the first elastic part and move downward, while driving the positioning frame to drive the filter tube to bend and deform downward, so that the aperture of the first filter hole on the filter tube is reduced, thereby improving the filtering effect of the filter tube on the liquid and further reducing the probability of the filter tube being damaged by the force of the liquid flow.

[0016] Optionally, the support device further includes a plurality of cover plates and a plurality of second elastic members corresponding to each other; the cover plates are rotatably connected to the movable member, and the rotation axis of the cover plates is perpendicular to the movable direction of the movable member; the two ends of the second elastic member are respectively connected to the cover plate and the movable member, and have a tendency to drive the cover plate to rotate toward the corresponding water diversion port to an extreme position and maintain it; When the cover piece rotates to the extreme position in the direction close to the corresponding water diversion port, the cover piece covers the corresponding water diversion port; when the cover piece rotates to the extreme position in the direction away from the corresponding water diversion port, the cover piece is tilted and the end away from the movable part is the tilted lower end.

[0017] By adopting the above technical solution, when the liquid filter is not in use, the cover plate can separate the space above and below the fixed plate, reduce the connectivity between the water inlet and the water outlet, and reduce the probability of the water inlet and the water outlet affecting each other; during the use of the liquid filter, the force of the liquid can drive the cover plate to rotate so that it can flow out from the water diversion port, and at the same time, the force of the liquid on the cover plate can also drive the movable part to move downward.

[0018] Optionally, the filter device further includes a dirt collecting box, and the interior of the dirt collecting box has a dirt collecting space; the dirt collecting box is arranged below the fixed plate, and the dirt collecting space is communicated with the end of the filter tube away from the water inlet pipe.

[0019] By adopting the above technical solution, impurities generated after the liquid in the internal space of the filter tube is filtered by the filter tube can flow with the liquid to the sewage collection space and be concentrated, thereby effectively reducing the probability of the first filter hole on the filter tube being blocked by impurities.

[0020] Optionally, a plurality of second filter holes are provided on the dirt collecting box, the aperture of the second filter holes is smaller than the aperture of the first filter holes, and the dirt collecting space can communicate with the space below the fixed plate through the second filter holes.

[0021] By adopting the above technical solution, the dirt collecting box collects impurities generated after the liquid is filtered by the filter tube, while the liquid can pass through the second filter holes, and the second filter holes can further filter the liquid.

[0022] Optionally, the filtering device further includes an adsorption member having a filtering effect, the adsorption member is detachably connected to the dirt collecting box, and the adsorption member can fill the dirt collecting space after being connected to the dirt collecting box.

[0023] By adopting the above technical solution, the adsorption component can further filter the liquid entering the sewage collection space while adsorbing impurities, reducing the probability of the second filter hole being blocked by impurities, and at the same time reducing the probability of impurities entering the sewage collection space returning to the filter tube.

[0024] Optionally, the tank body is provided with an opening for communicating the dirt collecting space with the space outside the tank body, and the tank body is provided with a sealing member for sealing the opening.

[0025] By adopting the above technical solution, it is convenient for the staff to replace the adsorption component and clean the impurities in the dirt collecting space when the liquid filter is not in use.

[0026] In summary, this application has at least one of the following beneficial effects: 1. The liquid to be filtered can be filtered promptly and fully after entering the cavity, so that the liquid filter has a high filtration efficiency and can filter the liquid stably and effectively; 2. When the flow rate of the liquid to be filtered is large, the filtering effect of the liquid filter on the liquid will be improved, and at the same time the influence of the liquid force on the filter device can be reduced, thereby extending the service life of the filter device; 3. The impurities generated after the liquid is filtered can be collected centrally, thereby reducing the probability of the filter device being blocked by impurities and making it easier for staff to clean up the impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a liquid filter according to an embodiment of the present application; Figure 2 This is a structural diagram of a liquid filter after hiding the upper half of the tank body in an embodiment of the present application; Figure 3 yes Figure 1 Cross-sectional view along line AA; Figure 4 yes Figure 3 Enlarged view of point B in the middle.

[0028] Explanation of the accompanying drawings: 1. Tank body; 11. Cavity; 12. Opening; 13. Sealing member; 2. Fixing plate; 21. Water outlet; 3. Water inlet pipe; 4. Water outlet pipe; 5. Filter device; 51. Filter tube; 511. First filter hole; 52. Waste collecting box; 521. Waste collecting space; 522. Second filter hole; 53. Adsorption member; 6. Support device; 61. Positioning frame; 611. Sleeve; 62. Movable member; 621. Water diversion port; 63. First elastic member; 64. Cover plate; 65. Second elastic member. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 This application is described in further detail.

[0030] Reference Figure 1 and Figure 2 The present application discloses a liquid filter, comprising a tank body 1, a fixing plate 2, a water inlet pipe 3, a water outlet pipe 4, a filter device 5, and a support device 6. The interior of the tank body 1 provides space for liquid filtration; the fixing plate 2 is used to mount the filter device 5 and the support device 6; the water inlet pipe 3 and the water outlet pipe 4 are used to respectively deliver the liquid to be filtered into the tank body 1 and discharge the filtered liquid out of the tank body 1; the filter device 5 filters the liquid within the tank body 1; and the support device 6 supports the filter device 5, improving its structural stability and ensuring that the filter device 5 can effectively filter the liquid over a long period of time.

[0031] The tank body 1 is generally cylindrical and is installed with its axis vertical. The interior of the tank body 1 comprises a generally cylindrical cavity 11, with the axis of the cavity 11 coinciding with the axis of the tank body 1. In this embodiment, the tank body 1 is preferably a two-section structure, which facilitates its manufacture and also facilitates the installation of other structures within the tank body 1.

[0032] Reference Figure 2 and Figure 3 The fixing plate 2 is fixedly installed in the cavity 11, with its outer edge fixedly connected to the inner wall of the cavity 11 and installed in a horizontal position relative to the axis of the tank body 1. After the fixing plate 2 is installed in the cavity 11, the cavity 11 is divided into two spaces. A circular water outlet 21 is provided in the middle of the fixing plate 2, which allows the space above the fixing plate 2 in the cavity 11 to communicate with the space below the fixing plate 2. In this embodiment, the fixing plate 2 is preferably located near the bottom of the tank body 1 in the cavity 11.

[0033] One end of the water inlet pipe 3 and the water outlet pipe 4 are both fixedly connected to the bottom of the tank body 1. The end of the water inlet pipe 3 extends into the cavity 11 and is located below the fixed plate 2. It is fixedly connected to the fixed plate 2 and communicates with the space above the fixed plate 2. The end of the water outlet pipe 4 communicates with the space below the fixed plate 2. In this embodiment, it is preferred that the water inlet direction of the water inlet pipe 3 in the space above the fixed plate 2 is vertically upward, and the water outlet direction of the water outlet pipe 4 in the space below the fixed plate 2 is vertically downward; and it is preferred that the opening of the water outlet pipe 4 in communication with the cavity 11 is aligned with the axis of the tank body 1, and the opening of the water inlet pipe 3 on the fixed plate 2 is located away from the water outlet 21.

[0034] The filter device 5 includes a filter tube 51, a dirt collection box 52, and an adsorbent 53. The filter tube 51 is used to filter the liquid entering the space above the fixed plate 2; the dirt collection box 52 is used to collect impurities generated during the liquid filtration process; and the adsorbent 53 is used to further filter the liquid and adsorb impurities.

[0035] The filter tube 51 is an overall tubular structure with a curved extension path. It also exhibits a certain degree of elastic deformation, meaning it can bend and deform when subjected to force and return to its original shape when the force ceases. The filter tube 51 is mounted on and positioned above the fixed plate 2. The two ends of the extended path of the filter tube 51 are fixedly connected to two ends of the fixed plate 2 along the same radial direction, and the interior of the filter tube 51 communicates with the end of the water inlet pipe 3. In this embodiment, the filter tube 51 preferably has an inverted U-shaped structure above the fixed plate 2, and is symmetrically distributed relative to the axis of the tank body 1.

[0036] A plurality of first filter holes 511 are evenly distributed on the surface of the filter tube 51 , and under normal conditions, the apertures of the plurality of first filter holes 511 are equal, which can effectively filter and separate impurities in the liquid.

[0037] The dirt collecting box 52 is fixedly mounted on the fixed plate 2 and is located below the fixed plate 2 ; the interior of the dirt collecting box 52 has a dirt collecting space 521 for collecting impurities, and the dirt collecting space 521 is communicated with the end of the internal space of the filter tube 51 away from the water inlet pipe 3 .

[0038] There are multiple second filter holes 522 evenly distributed on the surface of the sewage collecting box 52. The second filter holes 522 connect the sewage collecting space 521 with the space below the fixed plate 2, and the aperture of the second filter holes 522 is smaller than the aperture of the first filter holes 511, that is, the sewage collecting box 52 can allow liquid to pass through, and the sewage collecting box 52 has a stronger filtering effect on the passing liquid than the filter tube 51.

[0039] The adsorbent 53 has a filtering effect on liquid (a stronger filtering effect than the filter tube 51) and an adsorbent effect on impurities. The adsorbent 53 is adapted to and installed in the dirt collection space 521, and is detachably connected to the dirt collection box 52. In this embodiment, the adsorbent 53 is preferably an adsorbent cotton and is installed in the dirt collection space 521 with an interference fit to achieve a detachable connection with the dirt collection box 52.

[0040] Impurities that enter the internal space of the filter tube 51 through the water inlet pipe 3 and are filtered and separated by the first filter hole 511 can enter the sewage collecting space 521 with the flow of liquid, and after being intercepted by the second filter hole 522, remain in the sewage collecting space 521 or be adsorbed on the adsorption element 53, thereby effectively reducing the probability of impurities staying in the internal space of the filter tube 51 and causing blockage of the first filter hole 511.

[0041] Furthermore, in order to facilitate the staff to clean the impurities in the sewage collecting space 521 or replace the adsorbent 53 installed in the sewage collecting space 521, it is preferred that an opening 12 be provided on the tank body 1 for communicating the sewage collecting space 521 with the space outside the tank body 1, and it is preferred that a sealing member 13 for controlling the opening and closing of the opening 12 be installed on the tank body 1. In this embodiment, it is preferred that the sealing member 13 and the tank body 1 are detachably connected via a plurality of screws; after the sealing member 13 is installed and connected to the tank body 1, the sealing member 13 can cover the opening 12 and form a seal with the opening 12, effectively preventing the liquid in the cavity 11 from flowing out of the opening 12; when the sealing member 13 is disconnected from the tank body 1, the opening 12 will be open, and the staff can remove the impurities and adsorbent 53 in the sewage collecting space 521 through the opening 12.

[0042] Reference Figure 2 and Figure 4 The supporting device 6 includes a positioning member, a movable member 62, a first elastic member 63, a plurality of cover plates 64, and a plurality of second elastic members 65. The positioning member is used to support and position the filter tube 51, thereby improving the structural stability of the filter tube 51. The movable member 62 is used to form a connection between the positioning member and the fixed plate 2, and can control the bending deformation of the filter tube 51 according to the flow rate of the liquid. The first elastic member 63 is used to enable the movable member 62 to have a tendency to move and reset when the liquid flow rate is low. The cover plate 64 is used to control whether the filtered liquid can pass through the water outlet 21. The second elastic member 65 is used to enable the cover plate 64 to have a tendency to keep the water outlet 21 closed.

[0043] The movable member 62 is a circular pancake-shaped structure installed at the water outlet 21 and is movably connected to the fixed plate 2 in a direction parallel to the axis of the tank body 1. During the movement of the movable member 62 relative to the fixed plate 2, the movable member 62 will always remain in the water outlet 21.

[0044] The first elastic member 63 is mounted inside the fixed plate 2 near the water outlet 21. The two ends of the first elastic member 63 are fixedly connected to the movable member 62 and the fixed plate 2, respectively. The first elastic member 63 is capable of driving the movable member 62 toward the filter tube 51 to its limit position and maintaining it there. In this embodiment, the first elastic member 63 is preferably a compression spring.

[0045] The movable member 62 is provided with a plurality of water diversion ports 621, which are located within the water outlet 21. Liquid can pass through the movable member 62 through the water diversion ports 621. The plurality of water diversion ports 621 are arranged in a circular array around the axis of the movable member 62. The shape of the cover plate 64 matches the shape of the water diversion ports 621, and the plurality of cover plates 64 correspond one to one with the plurality of water diversion ports 621.

[0046] The cover plate 64 is rotatably connected to the movable member 62, and the rotation axis of the cover plate 64 is perpendicular to the movement direction of the movable member 62. The cover plate 64 is limited in its rotation relative to the movable member 62. When the cover plate 64 rotates to its limit position toward the corresponding water diversion port 621, the cover plate 64 contacts and abuts against the movable member 62, and the cover plate 64 covers the corresponding water diversion port 621, preventing liquid from flowing out through the water diversion port 621. When the cover plate 64 rotates to its limit position away from the corresponding water diversion port 621, the cover plate 64 is tilted relative to the movement direction of the movable member 62. When the movable member 62 is mounted on the fixed plate 2, the cover plate 64 is located below the fixed plate 2, and the end of the cover plate 64 away from the fixed plate 2 is the tilted lower end.

[0047] Multiple second elastic members 65 correspond one-to-one with the multiple cover plates 64 and are installed at the rotational connection points between the corresponding cover plates 64 and the movable member 62. The ends of the second elastic members 65 are fixedly connected to the corresponding cover plates 64 and the movable member 62, respectively. The second elastic members 65 have the tendency to drive the corresponding cover plates 64 to rotate toward the corresponding water diversion outlet 621 to the extreme position and maintain it. In this embodiment, the second elastic members 65 are preferably torsion springs, and their representation is omitted in the drawings, only their installation positions are shown.

[0048] When the liquid filter is not in use, that is, when there is no liquid in the cavity 11, the multiple cover plates 64 will respectively keep covering the corresponding water diversion ports 621 under the action of the corresponding second elastic members 65, so as to reduce the probability of the water inlet end of the water inlet pipe 3 and the water outlet end of the water outlet pipe 4 communicating with each other through the cavity 11 and affecting each other; when the liquid enters the space above the fixed plate 2 through the water inlet pipe 3, the liquid has a tendency to pass through the multiple water diversion ports 621 under the action of gravity. At this time, the force of the liquid on the cover plate 64 can overcome the force of the corresponding second elastic member 65 to drive the cover plate 64 to rotate away from the corresponding water diversion port, so that the corresponding water diversion port 621 is opened for liquid to flow out.

[0049] One end of the positioning frame 61 has a sleeve 611 that is compatible with the filter tube 51. The sleeve 611 is installed on the middle part of the filter tube 51. The inner surface of the sleeve 611 fits against the outer surface of the middle part of the filter tube 51, and the inner surface of the sleeve 611 is fixedly connected to the outer surface of the middle part of the filter tube 51, so that the middle part of the filter tube 51 has strong structural stability, that is, it maintains a circular tubular shape.

[0050] The other end of the positioning frame 61 is fixedly connected to the movable member 62. After the movable member 62 is installed on the fixed plate 2, the positioning frame 61 will be located above the movable member 62, and the positioning frame 61 will drive the filter tube 51 to bend and deform through the sleeve 611 during the movement of the movable member 62.

[0051] When the movable part 62 moves upward to the extreme position relative to the fixed plate 2, the position of the sleeve 611 can keep the apertures of the multiple first filter holes 511 on the filter tube 51 equal and meet the filtering effect requirements for the liquid; when the movable part 62 moves downward to the extreme position relative to the fixed plate 2, the filter tube 51 is restricted by the position of the sleeve 611 and is in a downward bending and deformed state, and the apertures of the multiple first filter holes 511 will be relatively reduced, which has a stronger filtering effect on the liquid.

[0052] When the flow rate of liquid entering the space above the fixed plate 2 through the water inlet pipe 3 is large, the force exerted by the liquid through the water diversion port 621 on the corresponding cover plate 64 can drive the cover plate 64 to overcome the force of the corresponding second elastic member 65 and rotate to the extreme position in the direction away from the corresponding diversion port. At this time, the force exerted by the liquid on the cover plate 64 can drive the movable member 62 to move downward, overcoming the force of the first elastic member 63. During the downward movement of the movable member 62, the middle part of the filter tube 51 can be driven to bend and deform downward, thereby reducing the probability of the filter tube 51 being damaged by the force of the liquid, and at the same time further improving the effect of liquid filtration.

[0053] The implementation principle of a liquid filter in the embodiment of the present application is as follows: The liquid to be filtered first enters the filter tube 51 through the water inlet pipe 3 and is filtered by the multiple first filter holes 511. It then enters the space above the fixed plate 2 in the cavity 11. After the impurities in the liquid are separated by the multiple first filter holes 511, they flow into the sewage collection space 521 along with the liquid. The filtered liquid then enters the space below the fixed plate 2 in the cavity 11 through the multiple second filter holes 522. The impurities are separated by the multiple second filter holes 522 and adsorbed on the adsorption element 53 to be cleaned by the staff later. The liquid in the space above the fixed plate 2 in the cavity 11 drives the multiple cover plates 64 to rotate under the action of gravity, thereby opening the multiple water diversion ports 621. The liquid then enters the space below the fixed plate 2 in the cavity 11 through the multiple water diversion ports 621. When the liquid flow rate is large, the force exerted on the cover plate 64 by the liquid during the process of passing through the water diversion ports 621 can drive the movable member 62 to move downward, driving the positioning frame 61 to drive the filter tube 51 to bend and deform downward, thereby further improving the filtration effect of the liquid. The filtered liquid in the space below the fixed plate 2 in the cavity 11 will eventually be discharged through the outlet pipe 4, completing the filtration of the liquid.

[0054] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A liquid filter, comprising a tank body (1), a water inlet pipe (3), a water outlet pipe (4) and a filter device (5), wherein the tank body (1) has a cavity (11) inside for the filter device (5) to be arranged, characterized in that: It also comprises a fixing plate (2), wherein the fixing plate (2) is located in the cavity (11) and is fixedly connected to the tank body (1); The filtering device (5) comprises a curved filtering tube (51), the filtering tube (51) being located above the fixing plate (2), and both ends of the filtering tube (51) being fixedly connected to the fixing plate (2); a plurality of first filtering holes (511) are provided on the filtering tube (51), and the space inside the filtering tube (51) can communicate with the space outside the filtering tube (51) through the first filtering holes (511); One end of the water inlet pipe (3) close to the tank body (1) extends into the cavity (11) and is connected to the fixing plate (2), and is communicated with one end of the internal space of the filter tube (51); a water outlet (21) is provided on the fixing plate (2) so that the space above and below the fixing plate (2) is communicated; one end of the water outlet pipe (4) close to the tank body (1) is connected to the bottom of the tank body (1) and is located below the water outlet (21).

2. A liquid filter according to claim 1, characterized in that: It also comprises a supporting device (6), the supporting device (6) comprising a positioning frame (61), and two ends of the positioning frame (61) are respectively connected to the filter tube (51) and the fixing plate (2).

3. A liquid filter according to claim 2, characterized in that: The filter tube (51) is a soft tube that can be bent and deformed, and after the bending and deformation, the aperture of the first filter hole (511) can be reduced; the positioning frame (61) has a sleeve (611), the sleeve (611) is sleeved and matched with the middle part of the filter tube (51), and the outer surface of the middle part of the filter tube (51) and the inner surface of the sleeve (611) are fitted and fixedly connected.

4. A liquid filter according to claim 3, characterized in that: The supporting device (6) further comprises a movable member (62) and a first elastic member (63), wherein the movable member (62) is arranged in the water outlet (21) and is movably connected to the fixing plate (2), and the movable direction of the movable member (62) is parallel to the height direction of the tank body (1); A plurality of water diversion openings (621) are formed on the movable member (62) in the water outlet (21), and the space above the fixed plate (2) can communicate with the space below the fixed plate (2) through the water diversion openings (621); The two ends of the first elastic member (63) are respectively connected to the movable member (62) and the fixed plate (2), and have a tendency to drive the movable member (62) to move in a direction close to the filter tube (51) to an extreme position and maintain the position.

5. A liquid filter according to claim 4, characterized in that: The supporting device (6) further comprises a plurality of cover plates (64) and a plurality of second elastic members (65) in one-to-one correspondence; the cover plates (64) are rotatably connected to the movable member (62), and the rotation axis of the cover plates (64) is perpendicular to the movable direction of the movable member (62); the two ends of the second elastic member (65) are respectively connected to the cover plates (64) and the movable member (62), and have a tendency to drive the cover plates (64) to rotate in a direction close to the corresponding water diversion port (621) to an extreme position and maintain the position; When the cover plate (64) rotates to an extreme position in a direction approaching the corresponding water diversion port (621), the cover plate (64) covers the corresponding water diversion port (621); when the cover plate (64) rotates to an extreme position in a direction away from the corresponding water diversion port (621), the cover plate (64) is inclined and the end thereof away from the movable member (62) is the inclined lower end.

6. A liquid filter according to claim 1, characterized in that: The filter device (5) further comprises a dirt collection box (52), and the dirt collection box (52) has a dirt collection space (521) inside; the dirt collection box (52) is arranged below the fixing plate (2), and the dirt collection space (521) is communicated with an end of the filter tube (51) away from the water inlet pipe (3).

7. A liquid filter according to claim 6, characterized in that: The dirt collecting box (52) is provided with a plurality of second filter holes (522), the aperture of the second filter holes (522) being smaller than the aperture of the first filter holes (511), and the dirt collecting space (521) can communicate with the space below the fixed plate (2) through the second filter holes (522).

8. A liquid filter according to claim 7, characterized in that: The filtering device (5) further comprises an adsorption member (53) having a filtering effect, wherein the adsorption member (53) is detachably connected to the dirt collecting box (52), and after the adsorption member (53) is connected to the dirt collecting box (52), it can fill the dirt collecting space (521).

9. A liquid filter according to claim 8, characterized in that: The tank body (1) is provided with an opening (12) for communicating the dirt collecting space (521) with the space outside the tank body (1), and the tank body (1) is provided with a sealing member (13) for sealing the opening (12).

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