Filter screen, drainer, sink and sink anti-clogging control method

Abstract

This application discloses a filter screen, a drain, a water tank, and a method for preventing clogging of the water tank. The filter screen includes a first filter screen and a second filter screen, the second filter screen being at least partially located within the first filter screen and rotatably engaged with the first filter screen. The second filter screen and the first filter screen are positionally engaged along their rotational axis. This solution can at least prevent filter screen clogging.

Description

Technical Field

[0001] This invention generally relates to the field of kitchen equipment technology, and specifically to a filter, drainer, sink, and sink anti-clogging control method. Background Technology

[0002] In modern kitchen sinks, to prevent food scraps (garbage) from being flushed directly into the drain and causing blockages, a filter screen (also called a strainer basket) is usually installed at the drain outlet. While this solves the problem of food scraps directly entering the drain and causing blockages, the food scraps easily clog the filter screen, requiring frequent manual emptying. Because the filter screen contains food scraps and is relatively dirty, cleaning it by hand can be psychologically daunting for some users. Summary of the Invention

[0003] This application aims to provide a filter, drainer, sink, and sink anti-clogging control method, at least for preventing filter clogging.

[0004] In a first aspect, the present invention provides a filter screen, comprising:

[0005] First filter;

[0006] A second filter screen is located at least partially within the first filter screen and is rotatably engaged with the first filter screen. The second filter screen is also positionally engaged with the first filter screen in the direction of its rotation axis.

[0007] As an alternative implementation, the filter screen further includes an axial positioning member, with the second filter screen and the first filter screen respectively rotatably engaged with the axial positioning member, and the second filter screen and the first filter screen respectively positioningly engaged with the axial positioning member in the axial direction.

[0008] As one possible implementation, the axial positioning member includes an annular body that is fitted around the outside of the first filter screen. The inner side of the annular body is provided with one of a first protrusion and a first groove, and the outer side of the first filter screen is provided with the other of the first protrusion and the first groove. The first protrusion is at least partially located within the first groove, and the first groove is an annular groove coaxial with the axial direction.

[0009] As an implementation method, the outer side of the annular body is provided with one of a second protrusion and a second groove, the opening of the second filter screen is provided with a flange, the flange is provided with the other of the second protrusion and the second groove, the second protrusion is at least partially located in the second groove, and the second groove is an annular groove coaxial with the axial direction.

[0010] As an alternative implementation, the filter screen may further include a transmission component for driving the second filter screen to rotate by the first filter screen.

[0011] As an implementation method, the transmission component includes a planetary carrier with at least one planetary gear rotatably mounted on it. The inner side of the first filter screen has at least one ring of internal teeth, and the outer side of the second filter screen has at least one ring of first external teeth. The planetary gear meshes with the internal teeth and the first external teeth, respectively.

[0012] As a possible implementation, the first filter screen is provided with at least a plurality of first filter holes;

[0013] The second filter screen is provided with at least a plurality of second filter holes, the opening of the second filter holes being larger than the opening of the first filter holes.

[0014] In a second aspect, the present invention provides a drainer, including a drainer housing and the aforementioned filter screen, wherein the filter screen is located inside the drainer housing;

[0015] It also includes a drive unit for driving the first filter screen to rotate.

[0016] As an implementation method, the driving device includes a drive motor disposed outside the drainer housing, and the drive shaft of the drive motor extends into the drainer housing and is fixedly connected to a drive gear. At least one ring of second external teeth is provided on the outer side of the first filter screen, and the drive gear meshes with the second external teeth.

[0017] As a possible implementation method, pressure sensors, control devices, and electric water injection valves are also included;

[0018] The pressure sensor is used to detect the pressure value exerted by the filter on the pressure sensor;

[0019] The control device is used to determine, based on the pressure value, whether to open the electric water injection valve to inject water into the drain housing; and / or whether to control the drive device to drive the first filter screen to rotate.

[0020] As an implementation method, the drainer housing is provided with a water jet nozzle, and the water jet direction of the water jet nozzle is tangent to the outer peripheral surface of the first filter screen;

[0021] The outlet of the electric water injection valve is connected to the water jet nozzle.

[0022] As an implementation method, the water jet nozzle is an elongated hole, and the length of the elongated hole extends parallel to the axis of the first filter screen.

[0023] Thirdly, the present invention provides a water tank, including a tank body, wherein a drain outlet is provided at the bottom of the tank body, and the drain outlet is connected to the aforementioned drain device.

[0024] Fourthly, the present invention provides a water tank anti-clogging control method, applied to the above-mentioned filter screen, the above-mentioned drainer, or the above-mentioned water tank, comprising the following steps:

[0025] The pressure value of the filter acting on the pressure sensor in real time is obtained;

[0026] Based on the pressure value, determine whether to open the electric water injection valve to inject water into the drain housing of the water tank to flush the filter screen; and / or whether to control the first filter screen and the second filter screen to rotate respectively.

[0027] As an implementation method, determining whether to open the electric water injection valve to inject water into the drainer housing to flush the filter screen based on the pressure value; and / or whether to control the first filter screen and the second filter screen to rotate respectively, specifically:

[0028] If V0 < V < 2V1, then the electric water injection valve is opened to inject water into the drainer housing to flush the filter screen, and the first filter screen and the second filter screen are controlled to rotate respectively.

[0029] If V > 2V1, the electric water injection valve is opened to inject water into the drain housing to flush the filter screen until V < 2V1, at which point the first filter screen and the second filter screen are controlled to rotate respectively.

[0030] Wherein, V0 is the first pressure threshold applied to the pressure sensor when there is no residue in the filter screen, V is the pressure value, and V1 is the second pressure threshold applied to the pressure sensor when the filter screen is full of residue.

[0031] The above solution incorporates a first filter and a second filter, with the second filter at least partially located within the first filter and rotating in coordination with it. When residue needs cleaning, the rotation of both filters allows the residue in the second filter to be thrown into the first filter, thus removing it. Furthermore, the opposing rotation and / or speed difference between the first and second filters ensure that the residue thrown towards the first filter is cut by its mesh, reducing its size and preventing blockage when water flows into the drain pipe.

[0032] In summary, by adopting the above-mentioned solution of this application, the residue in the filter screen can be cleaned directly by rotating the first and second filter screens without the need for manual emptying. On the one hand, this can prevent the residue from accumulating in the filter screen and causing blockage. On the other hand, it eliminates the psychological burden on users by eliminating the need to clean the filter screen by hand. Attached Figure Description

[0033] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0034] Figure 1 This is a front view of the filter provided in an embodiment of the present invention;

[0035] Figure 2 for Figure 1 Top view;

[0036] Figure 3 for Figure 1 A bottom view;

[0037] Figure 4 for Figure 1 A three-dimensional image;

[0038] Figure 5 for Figure 1 A-A sectional view;

[0039] Figure 6 for Figure 3 B-B sectional view;

[0040] Figure 7 for Figure 1 An exploded view from a 3D perspective;

[0041] Figure 8 This is a front view of a water tank provided in an embodiment of the present invention;

[0042] Figure 9 for Figure 8 Top view;

[0043] Figure 10 for Figure 9 C-C section view;

[0044] Figure 11 for Figure 10 D-D sectional view;

[0045] Figure 12 A perspective view of a water tank provided in an embodiment of the present invention;

[0046] Figure 13 This is a perspective view of the water tank provided in an embodiment of the present invention.

[0047] First filter screen 1, first filter hole 101, internal teeth 102, second external teeth 103, first protrusion 104, second filter screen 2, second filter hole 201, flange 202, screw 203, handle 204, first external teeth 205, axial positioning component 3, first groove 301, second groove 302, semi-circular arc component 303, transmission component 4, planetary carrier 401, connecting shaft 402, planetary gear 403, friction washer 404, flat washer 405, snap ring 406, drainer 5, drainer housing 501, fixed bracket 502, drive motor 503, drive gear 504, control device 505, motor fixing pressure component 506, electric water injection valve 507, pressure sensor 508, water jet nozzle 509, tank body 6, start switch 601, cover 602. Detailed Implementation

[0048] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] At least see Figure 1 - Figure 7 As shown, an example of the present invention provides a filter screen, comprising:

[0051] First filter 1;

[0052] For example, but not limited to, the first filter 1 may include a tubular body or a cylindrical body; wherein... Figure 1 In the example shown, the first filter 1 includes a tubular body, that is, the first filter 1 is generally tubular, and its tube wall is provided with a plurality of filter holes. The shape and size of the filter holes provided on the tube wall of the tubular body can be more than one type. For example, in this example, the filter holes on the tube wall of the tubular body can include round holes and elongated holes, with the elongated holes serving as the first filter hole 101 described below. Generally, the width of the elongated hole 101 and the diameter of the round hole can be less than 4 mm to prevent excessively large residues from leaking out of the filter and entering the drain pipe, causing drain pipe blockage. Of course, the figures here are only for illustrative purposes, and the width of the elongated hole and the diameter of the round hole can be other sizes depending on actual needs.

[0053] In this example, the first filter 1 is made of stainless steel. Of course, other materials, such as plastic, can be used in other examples.

[0054] The second filter 2 is at least partially located inside the first filter 1 and is rotatably engaged with the first filter 1. The second filter 2 is positioned in the direction of the first filter 1 along its rotational axis.

[0055] For example, but not limited to, the second filter screen 2 includes a cylindrical body, which includes a cylindrical sidewall and a bottom wall located at one end of the sidewall; multiple filter holes are respectively provided on the sidewall and the bottom wall, and the shape and size of the filter holes in the second filter screen 2 can be more than one type. For example, in this example, the filter holes of the second filter screen 2 can include round holes and elongated holes, with the elongated holes serving as the second filter hole 201 described below. In this example, the diameter of the round holes and the width of the elongated holes provided on the sidewall of the second filter screen 2 are larger than the diameter of the round holes and the width of the elongated holes provided on the bottom wall, to prevent excessively large residues from leaking out from the bottom wall and entering the drain pipe, causing drain pipe blockage. In this example, the diameter of the round holes and the width of the elongated holes provided on the sidewall of the second filter screen 2 can be less than 4.5 mm, and the diameter of the round holes and the width of the elongated holes provided on the bottom wall can be less than 3.5 mm.

[0056] As an implementation method, the opening of the second filter hole 201 is larger than the opening of the first filter hole 101 to prevent larger residues from being thrown out by the second filter screen 2 and directly leaking out from the first filter hole 101 of the first filter screen 1 and entering the drain pipe, causing the drain pipe to be blocked.

[0057] In this example, the opening of the second filter hole 201 is larger than the opening of the first filter hole 101. As mentioned above, both the second filter hole 201 and the first filter hole 101 are elongated holes. Therefore, since the opening of the second filter hole 201 is larger than the opening of the first filter hole 101, it can be considered that the length and / or width of the second filter hole 201 are respectively greater than the length and / or width of the first filter hole 101.

[0058] like Figure 5 In the example shown, the length of the second filter hole 201 is greater than the length of the first filter hole 101, and the width of the second filter hole 201 is greater than the width of the first filter hole 101. Furthermore, the diameter of the circular holes on the second filter screen 2 is greater than the diameter of the circular holes on the first filter screen 1.

[0059] The cylindrical body of the second filter 2 is placed inside the tubular body of the first filter 1 with its opening facing upward, so that the two can rotate relative to each other.

[0060] Furthermore, by positioning the second filter screen 2 and the first filter screen 1 along their axis of rotation, the second filter screen 2 and the first filter screen 1 can only rotate relative to each other and cannot be separated along their axis. This facilitates the removal or placement of the first filter screen 1 and the second filter screen 2 as a whole into the drain assembly housing. To facilitate the removal of the filter screen, a handle 204 can be connected to the bottom of the second filter screen 2. The handle 204 can be a columnar structure.

[0061] The above solution, by setting a first filter screen 1 and a second filter screen 2, and with the second filter screen 2 at least partially located inside the first filter screen 1 and rotating in coordination with the first filter screen 1, when the residue inside the filter screen needs to be cleaned, the first filter screen 1 and the second filter screen 2 are controlled to rotate, and the residue inside the second filter screen 2 can be thrown into the first filter screen 1, so that the residue inside the second filter screen 2 is cleaned away. In addition, the first filter screen 1 and the second filter screen 2 rotate in opposite directions and / or have a speed difference, so the residue thrown towards the first filter screen 1 will be cut by the mesh of the first filter screen 1, making the residue smaller, so that it will not cause blockage of the drain pipe when the water flows into the drain pipe.

[0062] In summary, by adopting the above-mentioned solution of this application, the residue in the filter screen can be cleaned directly by rotating the first filter screen 1 and the second filter screen 2 without the need for manual emptying. On the one hand, it can prevent the residue from accumulating in the filter screen and causing blockage. On the other hand, users do not need to clean the filter screen by hand, thus solving their psychological problem.

[0063] As an implementation method, in order to position the second filter 2 and the first filter 1 in the direction of their rotation axis, the filter further includes an axial positioning member 3, wherein the second filter 2 and the first filter 1 are respectively rotatably engaged with the axial positioning member 3, and the second filter 2 and the first filter 1 are respectively positioned with the axial positioning member 3 in the axial direction.

[0064] To reduce the friction between the second filter screen 2 and the first filter screen 1 and the axial positioning component 3 during rotation, the material of the axial positioning component 3 can be copper or a polymer material with self-lubricating properties, such as polytetrafluoroethylene (PTFE), polyimide (PI), polyether ether ketone (PEEK), polyphenylene sulfide (PPS), polyamide (PA), polyoxymethylene (POM), and ultra-high molecular weight polyethylene (UHMWPE).

[0065] As an implementation method, the axial positioning member 3 includes an annular body, which is sleeved on the outside of the first filter screen 1. The inner side of the annular body is provided with one of a first protrusion 104 and a first groove 301, and the outer side of the first filter screen 1 is provided with the other of the first protrusion 104 and the first groove 301. The first protrusion 104 is at least partially located in the first groove 301, and the first groove 301 is an annular groove coaxial with the axial direction.

[0066] For example, in Figure 6 In the example, a first groove 301 is provided on the inner side of the annular body, and a first protrusion 104 is provided on the outer side of the first filter screen 1. The first protrusion 104 is at least partially located in the first groove 301. The first groove 301 is an annular groove coaxial with the axial direction. The first groove 301 can restrict the movement of the first protrusion 104 in the axial direction, while allowing the first protrusion 104 to move in the first groove 301 around the axis of rotational engagement between the first filter screen 1 and the second filter screen 2, so as to realize the rotational engagement between the first filter screen 1 and the axial positioning member 3, and the positioning engagement between the first filter screen 1 and the axial positioning member 3 in the axial direction.

[0067] Of course, in other examples, the first protrusion 104 may be provided on the inner side of the annular body, and the first groove 301 may be provided on the outer side of the first filter 1.

[0068] As an implementation method, the outer side of the annular body is provided with one of the second protrusion and the second groove 302, and the opening of the second filter screen 2 is provided with a flange 202. The flange 202 is provided with the other of the second protrusion and the second groove 302. The second protrusion is at least partially located in the second groove 302, and the second groove 302 is an annular groove coaxial with the axial direction.

[0069] For example, in Figure 5 In the example, a second groove 302 is provided on the outer side of the annular body, and a flange 202 is provided at the opening of the second filter screen 2. A second protrusion is provided on the flange 202. The second protrusion can be an integral structure with the flange 202 or a separate structure. In this example, a separate structure is used, that is, a screw 203 is screwed onto the flange 202, and the area of ​​the screw 203 protruding into the second groove 302 serves as the second protrusion.

[0070] Since the second protrusion is at least partially located within the second groove 302, which is an annular groove coaxial with the axial direction, the second groove 302 can restrict the movement of the second protrusion in the axial direction, while allowing the second protrusion to move within the second groove 302 around the axis of rotational engagement between the first filter screen 1 and the second filter screen 2, thereby achieving rotational engagement between the second filter screen 2 and the axial positioning member 3, and positioning engagement between the second filter screen 2 and the axial positioning member 3 in the axial direction.

[0071] Of course, in other examples, a second protrusion may be provided on the inner side of the annular body, and a second groove 302 may be provided on the flange 202 of the second filter 2.

[0072] For ease of installation, as one possible approach, the axial positioning component 3 can be a split structure, such as comprising at least two sequentially connected arc-shaped parts. Figure 7 In the example shown, the axial positioning component 3 includes two arc-shaped components connected end to end, each of which is a semi-circular arc component 303. When the two are connected end to end, they form a ring-shaped component.

[0073] As an implementation method, in order to enable the first filter 1 and the second filter 2 to be linked, that is, to drive the other filter to rotate synchronously by one of the filters, in this example, the first filter 1 drives the second filter 2 to rotate, then the filter also includes a transmission component 4, which is used to drive the second filter 2 to rotate by the first filter 1.

[0074] As an implementable method, see at least the following: Figure 3 , Figure 6 , Figure 7 As shown, the transmission component 4 includes a planetary carrier 401, on which at least one planetary gear 403 is rotatably mounted; in this example, three planetary gears 403 are provided. For example, the planetary carrier 401 is provided with three connecting shafts 402, each connecting shaft 402 having a planetary gear 403 mounted on it. The ends of each connecting shaft 402 are sequentially connected to friction washers 404, flat washers 405, and retaining rings 406 to prevent the planetary gear 403 from detaching from the connecting shaft 402. The inner side of the first filter screen 1 is provided with at least one ring of internal teeth 102, and the outer side of the second filter screen 2 is provided with at least one ring of first external teeth 205. The planetary gears 403 mesh with the internal teeth 102 and the first external teeth 205, respectively.

[0075] See also at least Figure 10As shown, when an external driving component, such as a drive motor 503, drives the first filter screen 1 to rotate, the first filter screen 1 drives the planetary gears 403 on the planetary carrier 401 to rotate via its internal teeth 102. The planetary gears 403 then drive the second filter screen 2 to rotate by meshing with the first external teeth 205 on the second filter screen 2. The rotation direction of the first filter screen 1 is opposite to that of the second filter screen 2. Setting the rotation directions of the first filter screen 1 and the second filter screen 2 to be opposite increases the relative rotational speed difference between the two screens. With an increased speed difference, the first filter screen 1's ability to cut residues is enhanced.

[0076] In summary, the axial positioning component 3 comprises two sequentially connected arc-shaped parts, each of which is a semi-circular arc part 303. When connected end-to-end, they form a ring-shaped component. Furthermore, a first groove 301 is provided on the inner wall of this ring-shaped component. A first protrusion 104 extending radially along the outer side of the upper part of the first filter screen 1 is provided. The first protrusion 104 is at least partially located within the first groove 301, allowing the axial positioning component 3 to rotate relative to the first filter screen 1 without separating along its axis. Additionally, the opening of the second filter screen 2... A flange 202 is provided at the point where a screw 203 is screwed onto the flange 202. The screw 203 protrudes into the second groove 302 at the outer end of the annular component, allowing the axial positioning member 3 to rotate relative to the second filter screen 2, but preventing separation along the axis of the first filter screen 2. Thus, the first filter screen 1 and the second filter screen 2 are connected by the axial positioning member 3, and the axial positioning member 3 restricts the vertical movement of the first filter screen 1 and the second filter screen 2 in the opposite axial direction. Therefore, the first filter screen 1 and the second filter screen 2 can be placed into or removed from the water tank as a whole via the handle 204 connected to the second filter screen 2. Furthermore, since both the first filter screen 1 and the second filter screen 2 can rotate around the axial positioning member 3, they can also rotate relative to each other.

[0077] As an alternative, the planetary carrier 401 is fixedly connected to the axial positioning member 3.

[0078] As described above, the axial positioning member 3 restricts the vertical movement of the first filter screen 1 and the second filter screen 2 in the opposite direction of the axis. Both the first filter screen 1 and the second filter screen 2 can rotate around the axial positioning member 3. When the planetary carrier 401 is fixedly connected to the axial positioning member 3, the planetary carrier 401 can also rotate relative to the first filter screen 1 and the second filter screen 2 respectively. The planetary gears on the planetary carrier 401 transmit the rotation of the first filter screen 1 to the second filter screen 2, and the first filter screen 1 rotates relative to the second filter screen 2.

[0079] Secondly, see at least another aspect. Figure 8 - Figure 13 As shown, the present invention provides a drainer 5, including a drainer housing 501 and the above-mentioned filter screen, wherein the filter screen is located inside the drainer housing 501;

[0080] It also includes a drive device for driving the first filter screen 1 to rotate.

[0081] As described above, since the first filter screen 1 and the second filter screen 2 can achieve relative rotational engagement through the planetary gear 403 system, when the driving device drives the first filter screen 1 to rotate, the first filter screen 1 drives the second filter screen 2 to rotate through the planetary gear 403 of the planetary gear 403 system.

[0082] The driving device can drive the first filter 1 to rotate in either a reciprocating rotation or a continuous rotation in one direction.

[0083] The reciprocating rotation can refer to the following: the driving device drives the first filter 1 to rotate a certain angle in one direction, then drives the first filter 1 to rotate a certain angle in the opposite direction, and so on until the work is completed. For example, but not limited to, the driving device drives the first filter 1 to rotate 90° clockwise, then drives the first filter 1 to rotate 90° counterclockwise, and then drives the first filter 1 to rotate 90° clockwise again, and so on until the work is completed. The rotation angles described here are merely examples and are not the only limitation of this solution; other angles can be set according to actual needs.

[0084] By reciprocating rotation, the first filter screen 1 and the second filter screen 2 can tear larger pieces or strips of residue in both directions, which helps to crush them and prevents them from getting tangled on the outside of the second filter screen 2 and causing the second filter screen 2 to become clogged.

[0085] As an implementation method, the driving device includes a drive motor 503, which is disposed outside the drain housing 501, and the drive shaft of the drive motor 503 extends into the drain housing 501 and is fixedly connected to a drive gear 504. At least one ring of second external teeth 103 is provided on the outer side of the first filter screen 1, and the drive gear 504 meshes with the second external teeth 103.

[0086] At least as Figure 10 , Figure 13As shown, a fixing bracket 502 is fixedly connected to the bottom of the tank 6. The fixing bracket 502 can be fixed to the bottom of the tank 6 by means of adhesive bonding, welding, etc. A motor fixing pressure member 506 is fixedly connected to the fixing bracket 502 by screws. The drive motor 503 is fixed to the fixing bracket 502 by the motor fixing pressure member 506. The motor fixing pressure member 506 can be made of elastic material or flexible plastic, etc., to act as a shock-absorbing pad and prevent the entire tank 6 from vibrating during the rotation of the drive motor 503.

[0087] The drive gear 504 connected to the output shaft of the drive motor 503 can be a bevel gear. The bevel gear meshes with the second external tooth 103 provided on the outside of the first filter screen 1. When the drive motor 503 rotates, the first filter screen 1 is driven to rotate through the bevel gear.

[0088] The rotation of the drive motor 503 can be controlled by manually triggering the start switch 601. For example, the start switch 601 can be located on the top of the tank 6, making it easy for the user to reach from any position.

[0089] Of course, see also Figure 13 As shown, the drive motor 503 can also be controlled to rotate automatically. In the scheme of controlling the drive motor 503 to rotate automatically, the water tank also includes a pressure sensor 508, a control device 505, and an electric water injection valve 507.

[0090] The pressure sensor 508 is used to detect the pressure value exerted by the filter on the pressure sensor 508;

[0091] The control device 505 is used to determine, based on the pressure value, whether to open the electric water injection valve 507 to inject water into the drain housing 501; and / or whether to control the drive device to drive the first filter screen 1 to rotate.

[0092] For example, when V0 < V < 2V1, the electric water injection valve 507 is opened to inject water into the drain housing 501 to flush the filter screen, so that the residue flows out of the filter screen with the water flow and enters the drain pipe. At the same time, the first filter screen 1 and the second filter screen 2 are controlled to rotate to throw out the residue in the second filter screen 2, and the first filter screen 1 cuts the residue through its first filter screen during the rotation.

[0093] If V > 2V1, it indicates that the filter screen is clogged. In this case, only the electric water injection valve 507 is opened to inject water into the drain housing 501 to flush the filter screen, without starting the drive device. This prevents the relative movement between the first filter screen 1 and the second filter screen 2 when the filter screen is clogged from worsening the blockage. As the water flows, some small particles of residue are carried away by the water flow, and the filter screen becomes open. As the amount of residue in the filter screen decreases, the pressure value exerted by the filter screen on the pressure sensor 508 decreases until V < 2V1. Then, the drive device is turned on to control the first filter screen 1 and the second filter screen 2 to rotate respectively, so that the residue can be quickly removed from the filter screen.

[0094] Wherein, V0 is the first pressure threshold acting on the pressure sensor 508 when there is no residue in the filter screen, V is the pressure value, and V1 is the second pressure threshold acting on the pressure sensor 508 when the filter screen is full of residue.

[0095] As an implementation method, in order to enable the water flow to have a better rinsing effect on the filter screen, the drain housing 501 is provided with a water jet nozzle 509, and the water jet direction of the water jet nozzle 509 is tangent to the outer peripheral surface of the first filter screen 1.

[0096] The outlet of the electric water injection valve 507 is connected to the water jet nozzle 509.

[0097] By aligning the water jet direction of the water jet nozzle 509 with the outer peripheral surface of the first filter screen 1, the water jetted from the water jet nozzle 509 during the rotation of the first filter screen 1 can wash the outer surface of the first filter screen 1 with the greatest possible impact force. Furthermore, some of the water can pass through the first filter screen 1 and wash the second filter screen 2.

[0098] As an implementation method, the water jet nozzle 509 is an elongated hole, and the length of the elongated hole extends parallel to the axis of the first filter screen 1.

[0099] The water jet nozzle 509 is an elongated hole, and the water jet it sprays is equivalent to forming a water jet. Furthermore, since the length of the elongated hole is parallel to the axis of the first filter screen 1, the water jet can cover a larger area outside the first filter screen 1, which is beneficial for thoroughly rinsing the first filter screen 1.

[0100] Thirdly, see at least the following: Figure 8 - Figure 13 As shown, the present invention provides a water tank, including a tank body 6, the bottom of the tank body 6 is provided with a drain outlet, and the drain outlet is connected to the aforementioned drainer 5.

[0101] A cover 602 can also be installed on the drain outlet.

[0102] Fourthly, the present invention provides a water tank anti-clogging control method, applied to the above-mentioned filter screen, the above-mentioned drainer 5, or the above-mentioned water tank, comprising the following steps:

[0103] Obtain the real-time pressure value of the filter screen acting on the pressure sensor 508;

[0104] Based on the pressure value, determine whether to open the electric water injection valve 507 to inject water into the drain housing 501 of the water tank to flush the filter screen; and / or whether to control the first filter screen 1 and the second filter screen 2 to rotate respectively.

[0105] As an implementation method, determining whether to open the electric water injection valve 507 to inject water into the drain housing 501 to flush the filter screen based on the pressure value; and / or whether to control the first filter screen 1 and the second filter screen 2 to rotate respectively, specifically:

[0106] If V0 < V < 2V1, then the electric water injection valve 507 is opened to inject water into the drain housing 501 to flush the filter screen, and the first filter screen 1 and the second filter screen 2 are controlled to rotate respectively.

[0107] If V > 2V1, the electric water injection valve 507 is opened to inject water into the drain housing 501 to flush the filter screen until V < 2V1, at which point the first filter screen 1 and the second filter screen 2 are controlled to rotate respectively.

[0108] Wherein, V0 is the first pressure threshold acting on the pressure sensor 508 when there is no residue in the filter screen, V is the pressure value, and V1 is the second pressure threshold acting on the pressure sensor 508 when the filter screen is full of residue.

[0109] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise stated, "a plurality of" means two or more.

[0110] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A drainer (5), characterized in that, The device includes a drain housing (501), a filter screen, and a drive unit. The filter screen is located inside the drain housing (501). The filter screen includes a first filter screen (1), a second filter screen (2), an axial positioning member (3), and a transmission member (4). The second filter screen (2) is at least partially located inside the first filter screen (1). The second filter screen (2) and the first filter screen (1) are rotatably engaged with the axial positioning member (3), and the second filter screen (2) and the first filter screen (1) are positioned and engaged with the axial positioning member (3) in the direction of its rotation axis. The axial positioning component (3) includes an annular body, which is sleeved on the outside of the first filter screen (1). The inner side of the annular body is provided with one of a first protrusion (104) and a first groove (301), and the outer side of the first filter screen (1) is provided with the other of the first protrusion (104) and the first groove (301). The first protrusion (104) is at least partially located in the first groove (301), and the first groove (301) is an annular groove coaxial with the axial direction. The outer side of the annular body is provided with one of a second protrusion and a second groove (302), and the opening of the second filter (2) is provided with a flange (202). The flange (202) is provided with the other of the second protrusion and the second groove (302). The second protrusion is at least partially located in the second groove (302), and the second groove (302) is an annular groove coaxial with the axial direction. The transmission component (4) includes a planet carrier (401), on which at least one planetary gear (403) is rotatably disposed. The inner side of the first filter screen (1) is provided with at least one ring of internal teeth, and the outer side of the second filter screen (2) is provided with at least one ring of first external teeth (205). The planetary gear (403) meshes with the internal teeth and the first external teeth (205) respectively. The driving device is used to drive the first filter (1) to rotate.

2. The drainer (5) according to claim 1, characterized in that, The first filter screen (1) is provided with at least a plurality of first filter holes (101); The second filter (2) is provided with at least a plurality of second filter holes (201), the opening of the second filter hole (201) being larger than the opening of the first filter hole (101).

3. The drainer (5) according to claim 1, characterized in that, The driving device includes a drive motor (503), which is disposed outside the drain housing (501). The drive shaft of the drive motor (503) extends into the drain housing (501) and is fixedly connected to a drive gear (504). At least one ring of second external teeth (103) is provided on the outer side of the first filter screen (1). The drive gear (504) meshes with the second external teeth (103).

4. The drainer (5) according to claim 1 or 3, characterized in that, It also includes a pressure sensor (508), a control device (505), and an electric water injection valve (507); The pressure sensor (508) is used to detect the pressure value exerted by the filter on the pressure sensor (508); The control device (505) is configured to determine whether to open the electric water injection valve (507) to inject water into the drainer housing (501); and / or whether to control the driving device to drive the first filter screen (1) to rotate, based on the pressure value.

5. The drainer (5) according to claim 4, characterized in that, A water flow injection port (509) is provided on the drainer housing (501), and the water flow injection direction of the water flow injection port (509) is tangent to the outer peripheral surface of the first filter screen (1). The water outlet of the electric water injection valve (507) is connected to the water flow injection port (509).

6. The drainer (5) according to claim 5, characterized in that, The water flow injection port (509) is a long strip hole, and the length extension direction of the long strip hole is parallel to the axis of the first filter screen (1).

7. A water tank, characterized in that, It includes a tank body (6), a drain port is provided at the bottom of the tank body (6), and the drain port is connected to the drainer (5) according to any one of claims 4-6.

8. A method for preventing blockage in a water tank, applied to the drainer (5) according to any one of claims 4-6 or the water tank according to claim 7, characterized in that, It includes the following steps: Obtain the pressure value that the filter screen acts on the pressure sensor (508) in real time. Based on the magnitude of the pressure value, determine whether to open the electric water injection valve (507) to inject water into the drainer housing (501) of the water tank to wash the filter screen; and / or whether to control the first filter screen (1) and the second filter screen (2) to rotate respectively.

9. The water tank anti-clogging control method according to claim 8, characterized in that, The determination of whether to open the electric water injection valve (507) to inject water into the drainer housing (501) to wash the filter screen; and / or whether to control the first filter screen (1) and the second filter screen (2) to rotate respectively, based on the magnitude of the pressure value, specifically is: If V0 < V < 2V1, open the electric water injection valve (507) to inject water into the drainer housing (501) to wash the filter screen, and control the first filter screen (1) and the second filter screen (2) to rotate respectively. If V > 2V1, open the electric water injection valve (507) to inject water into the drainer housing (501) to wash the filter screen until V < 2V1, then control the first filter screen (1) and the second filter screen (2) to rotate respectively. Wherein, V0 is the first pressure threshold value when there is no residue in the filter screen acting on the pressure sensor (508), V is the pressure value, and V1 is the second pressure threshold value when the filter screen is full of residue acting on the pressure sensor (508).

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