Foreign matter filtering structure, drainage assembly and washing machine

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By designing a filter element with a drainage cavity with a gradually reduced cross-sectional area in the foreign object filter structure, the problem that the existing foreign object filter device is easily blocked by flexible wire chips is solved, effective interception of hard foreign objects and accelerated passage of flexible foreign objects is achieved, and maintenance-free filtering effect is achieved.

CN119531098APending Publication Date: 2025-02-28SHANGHAI HAIER LAUNDRY ELECTRIC APPLIANCES CO LTD +1

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Patent Information

Application Number: CN202311110428.7
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Filing Date: 2023-08-30
Publication Date: 2025-02-28

AI Technical Summary

Technical Problem

Existing foreign object filter devices are easily blocked by flexible wire chips, resulting in frequent cleaning or replacement.

Method used

A foreign object filter structure is designed, including a water pipe and a filter member. A plurality of drainage chambers extending parallel to the first straight line are provided on the filter member. The cross-sectional area of the drainage chamber gradually decreases along the water flow direction, which can intercept hard foreign matter and allow flexible foreign matter to pass through accelerated.

Benefits of technology

Effectively intercept hard foreign objects, such as buttons and coins, while simultaneously driving flexible foreign objects such as wire chips to accelerate their passage, avoid blockage, and achieve maintenance-free filtering effect.

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Abstract

The invention discloses a foreign matter filtering structure, a drainage assembly and a washing machine, and belongs to the technical field of clothes treatment.The foreign matter filtering structure comprises a water passing pipe and a filtering piece, and the water passing pipe comprises a water passing channel extending along a first straight line; the filtering part is arranged in the water passing channel, a plurality of drainage cavities extending parallel to the first straight line are formed in the filtering part, the sectional area of each drainage cavity is gradually reduced in the water flowing direction, and the drainage cavities can intercept hard foreign matter and allow flexible foreign matter to pass through in an accelerated mode. The drainage assembly comprises the foreign matter filtering structure. The washing machine comprises the drainage assembly. Due to the fact that the sectional area of the drainage cavity is gradually reduced in the flowing direction of water, the water flow can be accelerated, due to the fact that water flow acceleration can provide power for the flexible foreign matter and drive the flexible foreign matter to pass through the drainage cavity in an accelerated mode, blocking can be avoided, and the size of the drainage cavity can be set according to needs to intercept hard foreign matter.

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Description

Technical Field

[0001] The present invention relates to the technical field of clothing processing, and in particular to a foreign matter filtering structure, a drainage component and a washing machine. Background Art

[0002] Washing machines are commonly used for washing clothes. During drainage, soft lint, hair, and other debris are discharged with the wash water, along with hard foreign objects such as buttons and coins. To collect these debris, most existing washing machines have a lint filter installed before the drain pump to filter out lint as the wash water is discharged. Foreign objects such as buttons and coins can damage the lint filter, so a foreign object filter is typically installed before the lint filter to filter out buttons, coins, and other foreign objects.

[0003] like Figure 1 and Figure 2 As shown, commonly used foreign matter filters use a mesh cover 10' with larger holes. While this can filter out foreign objects like buttons and coins, these two types of mesh covers 10' tend to catch long lint, quickly causing clogging and requiring frequent cleaning or replacement. Another type of foreign matter filter utilizes a labyrinth-shaped channel. After exiting the washing machine's outer drum, the wash water passes through the labyrinth-shaped channel to the lint filter. While the labyrinth-shaped channel is relatively tortuous and can block foreign objects like buttons and coins, it still suffers from the problem of clogging. Summary of the Invention

[0004] The object of the present invention is to provide a foreign matter filtering structure, a drainage assembly and a washing machine, so as to solve the technical problem in the prior art that the foreign matter filtering device is easily clogged by lint.

[0005] As conceived above, the technical solution adopted by the present invention is:

[0006] A foreign matter filtering structure, comprising:

[0007] A water pipe comprising a water passage extending along a first straight line;

[0008] A filter element is arranged in the water passage, and is provided with a plurality of drainage cavities extending parallel to the first straight line. The cross-sectional area of the drainage cavity gradually decreases along the flow direction of water. The drainage cavity can intercept hard foreign matter and allow flexible foreign matter to pass through at an accelerated speed.

[0009] Wherein, one side of the filter element is a water-facing surface, the water inlet end of the drainage cavity is arranged on the water-facing surface, and the water-facing surface is a flat surface or a curved surface.

[0010] Wherein, a water-guiding curved surface is formed at the junction of the drainage cavity and the water-facing surface, and water flows into the drainage cavity along the water-guiding curved surface.

[0011] The first straight line extends in a horizontal direction, the water-facing surface is a plane, and the water-facing surface is perpendicular to the first straight line.

[0012] The first straight line extends in a horizontal direction, the water-facing surface is a plane, and along the flow direction of water, the top end of the water-facing surface is located upstream of the bottom end of the water-facing surface.

[0013] Wherein, the water pipe and the filter element are integrally formed.

[0014] In which, the water pipe includes a water inlet section and a filter section arranged in sequence along the flow direction of water, the filter element is arranged in the filter section, the cross-sectional area of the filter section is larger than the cross-sectional area of the water inlet section, and the cross-sectional area of the water inlet section is equal to the sum of the water outlet areas of the water outlet ends of all drainage cavities.

[0015] Wherein, upstream of the filter element, along the flow direction of water, the water inlet area of the water passage gradually decreases.

[0016] A drainage assembly, comprising:

[0017] Drain pump, including water inlet and outlet;

[0018] a drain pipe, connected to the water inlet;

[0019] The foreign matter filtering structure as described above, wherein the water pipe is connected to the drain pipe;

[0020] A lint filter is provided on the drain pipe, and the lint filter is located between the drain pump and the filter element.

[0021] A washing machine, comprising:

[0022] Box;

[0023] An outer cylinder assembly comprises an outer cylinder, wherein the outer cylinder is arranged in the box body;

[0024] In the drainage assembly as described above, one end of the drainage pipe away from the drainage pump is communicated with the outer cylinder.

[0025] Beneficial effects of the present invention:

[0026] The foreign matter filtering structure proposed by the present invention is that when water flows through the water passage of the water pipe, it passes through the filter element. Because the filter element is provided with multiple drainage cavities extending parallel to the first straight line, the water flows through the drainage cavities. Since the cross-sectional area of the drainage cavities gradually decreases along the direction of water flow, it can accelerate the water flow. The accelerated water flow provides power to flexible foreign matter, driving it to accelerate through the drainage cavities. The size of the drainage cavities can be set as needed to intercept hard foreign matter. Therefore, the above-mentioned foreign matter filtering structure can not only intercept hard foreign matter, such as buttons and coins, but also accelerate the passage of flexible foreign matter, avoiding blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of an existing mesh cover;

[0028] Figure 2 It is a structural diagram of another existing mesh cover;

[0029] Figure 3 is a cross-sectional view of a foreign matter filtering structure provided in Example 1 of the present invention;

[0030] Figure 4 is a partial structural cross-sectional view of a filter element provided in Example 1 of the present invention;

[0031] Figure 5 is a side view of the foreign matter filtering structure provided in Example 1 of the present invention;

[0032] Figure 6 is a cross-sectional view of a foreign matter filtering structure provided in a second embodiment of the present invention;

[0033] Figure 7 is a cross-sectional view of a foreign matter filtering structure provided in Example 3 of the present invention;

[0034] Figure 8 is a cross-sectional view of another foreign matter filtering structure provided in Example 3 of the present invention;

[0035] Figure 9 is a cross-sectional view of a foreign matter filtering structure provided by a fourth embodiment of the present invention;

[0036] Figure 10 It is a schematic diagram of a drainage component provided by an embodiment of the present invention.

[0037] In the picture:

[0038] 10', mesh cover;

[0039] 11. Water pipe; 111. Water channel; 112. Water inlet section; 113. Filter section; 114. Water outlet section;

[0040] 12. Filter element; 121. Drainage cavity; 122. Water-facing surface; 123. Water-receiving surface; 124. Water-guiding curved surface;

[0041] 100, hard foreign matter; 200, soft foreign matter;

[0042] 20. Drain pump; 30. Drain pipe; 40. Lint filter. DETAILED DESCRIPTION

[0043] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0044] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0046] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0047] Example 1

[0048] See also Figure 3 and Figure 4An embodiment of the present invention provides a foreign matter filtering structure comprising a water pipe 11 and a filter element 12. Water pipe 11 includes a water passage 111 extending along a first straight line. Filter element 12 is disposed within water passage 111 and is provided with a plurality of drainage cavities 121 extending parallel to the first straight line. The cross-sectional area of drainage cavities 121 gradually decreases along the direction of water flow. Drainage cavities 121 are capable of intercepting hard foreign matter 100 while allowing flexible foreign matter 200 to pass through at an accelerated rate. Arrows in the accompanying drawings indicate the direction of water flow, with O1 representing the first straight line.

[0049] When water flows in the water passage 111 of the water pipe 11, it passes through the filter element 12. Since the filter element 12 is provided with a plurality of drainage cavities 121 extending parallel to the first straight line, the water flows through the drainage cavities 121. Since the cross-sectional area of the drainage cavities 121 gradually decreases along the flow direction of the water, it can accelerate the water flow. Since the accelerated water flow provides power to the flexible foreign matter 200, it drives the flexible foreign matter 200 to accelerate through the drainage cavity 121. The size of the drainage cavity 121 can be set as needed to intercept hard foreign matter 100. Therefore, the above-mentioned foreign matter filtering structure can not only intercept hard foreign matter 100, such as buttons, coins, etc., but also drive the flexible foreign matter 200 to pass through faster and avoid blockage. Conventional foreign matter filtering devices can block hard foreign matter 100, but cannot accelerate flexible foreign matter 200. Conventional concepts even facilitate the deposition of foreign matter by decelerating the flow.

[0050] The water pipe 11 has a water inlet and a water outlet, and a water passage 111 is formed between the water inlet and the water outlet. As described above, the filter element 12 is disposed in the water passage 111 and is used to filter the water flowing through the water passage 111. The purpose of the filtration is to intercept hard foreign matter 100, such as buttons, coins, etc., but it does not intercept soft foreign matter 200, and even accelerates the passage of the soft foreign matter 200. Therefore, the water flowing through the water passage 111 will pass through the drainage cavity 121 on the filter element 12 to achieve the above purpose. In other words, the water flowing in the water passage 111 has no other channels except the drainage cavity 121 on the filter element 12. Therefore, the edge of the filter element 12 is sealed and connected to the inner wall of the water pipe 11, so that the water flowing through the water passage 111 will pass through the drainage cavity 121.

[0051] The filter element 12 and the water pipe 11 can be integrally formed or detachably connected. In the case of an integrally formed design, a seal can be ensured. In the case of a detachable connection, the water pipe 11 can be divided into two sections, with the two sections clamping the filter element 12. A sealing ring is provided at the clamping point between the water pipe 11 and the filter element 12.

[0052] The cross-sectional shape of the water passage 111 is typically circular, i.e., the water passage 11 is a circular tube. In some embodiments, the cross-sectional shape of the water passage 111 may also be elliptical, triangular, rectangular, or other polygonal. It is understood that the shape of the filter element 12 is adapted to the cross-sectional shape of the water passage 111.

[0053] One side of the filter element 12 is a water-facing surface 122, and the water inlet end of the drainage chamber 121 is arranged on the water-facing surface 122. The other side of the filter element 12 is a water-repelling surface 123, and the water outlet end of the drainage chamber 121 can be arranged on the water-repelling surface 123, or the water outlet end of the drainage chamber 121 can be arranged to protrude from the water-repelling surface 123. The length of the drainage chamber 121 can be set according to actual needs. Among them, the water-facing surface 122 is the surface of the filter element 12 facing the water inlet of the water pipe 11, and the water-repelling surface 123 is the surface of the filter element 12 facing the water outlet of the water pipe 11. The water in the water pipe 11 flows from the water-facing surface 122 to the water-repelling surface 123.

[0054] A water guide curved surface 124 is formed at the junction of the drainage cavity 121 and the water-facing surface 122, and water flows into the drainage cavity 121 along the water guide curved surface 124. The water guide curved surface 124 plays a water guide role, facilitating the smooth flow of water, thereby ensuring the speed of the water flow and facilitating the rapid passage of the flexible foreign body 200.

[0055] The size of the drainage cavity 121 can be set as needed to intercept hard foreign objects 100. During the washing process, most hard foreign objects 100 are buttons, coins, etc. According to the diameter of the smallest button commonly used in households, the diameter of the water inlet end of the drainage cavity 121 can be set to be less than or equal to 12 mm, so as to ensure that buttons and coins cannot pass through.

[0056] The water-facing surface 122 can be a flat surface or a curved surface. A flat surface is convenient for processing and production. A curved surface can increase the area of the water-facing surface 122, so that the water flow fully contacts the water-facing surface 122.

[0057] like Figure 3 As shown, the first straight line extends horizontally, and the water-facing surface 122 is a flat surface, perpendicular to the first straight line. As water flows through the drainage cavity 121, the flexible foreign matter 200 accelerates through it, while the hard foreign matter 100 is filtered out. Specifically, the hard foreign matter 100 is intercepted in front of the water-facing surface 122. Because the water-facing surface 122 is perpendicular to the first straight line, the hard foreign matter 100 falls into the water pipe 11 under the action of its own weight.

[0058] When the water-facing surface 122 is a curved surface, the water-facing surface 122 can be concave toward the back surface 123. Alternatively, the water-facing surface 122 can be convex away from the back surface 123. Although the water-facing surface 122 is a curved surface, the drainage cavity 121 still extends along the first straight line, facilitating the rapid passage of water. Intercepted hard foreign matter 100 can slide down the water-facing surface 122. When the water-facing surface 122 is convex away from the back surface 123, the water-facing surface 122 can be a conical surface, with the axis of the conical surface extending along the first straight line.

[0059] The filter element 12 may include a filter plate and a plurality of bosses provided on the filter plate, and the drainage cavity 121 passes through the filter plate and the bosses. Regarding the arrangement of the plurality of drainage cavities 121 on the filter element 12, different arrangement forms may be selected according to different shapes of the filter element 12. Figure 5 As shown, when the filter element 12 is circular, the multiple drainage cavities 121 are arranged in a circular pattern centered around the center of the filter element 12. The drainage cavities 121 in two adjacent circular rings can be staggered. In some embodiments, when the filter element 12 is rectangular, the multiple drainage cavities 121 can be arranged in a matrix on the filter element 12. The drainage cavities 121 in two adjacent rows can be staggered.

[0060] Each drainage cavity 121 has an inlet and an outlet. It is understood that the cross-sectional area of the drainage cavity 121 gradually decreases from the inlet to the outlet. The cross-sectional area of the inlet of each drainage cavity 121 can be the same or different. For example, the cross-sectional diameter of the inlet of some drainage cavities 121 can be 10 mm, while the cross-sectional diameter of the inlet of some drainage cavities 121 can be 8 mm. Similarly, the cross-sectional area of the outlet of each drainage cavity 121 can be the same or different.

[0061] Since there are not many hard foreign objects 100 in the water flow and they can fall down under the interception of the filter element 12, they will not affect the water flow through the filter element 12. The flexible foreign objects 200 can accelerate through the filter element 12 and will not cause blockage of the filter element 12. Therefore, the foreign matter filtering structure provided by the present application can be a maintenance-free structure, which does not require maintenance during long-term use, avoiding frequent disassembly and cleaning.

[0062] Example 2

[0063] Figure 6A second embodiment is shown, wherein components identical or corresponding to those in the first embodiment are denoted by the corresponding reference numerals. For simplicity, only the differences between the second embodiment and the first embodiment will be described. The difference lies in that the first straight line extends horizontally, the water-facing surface 122 is flat, and the top of the water-facing surface 122 is located upstream of the bottom of the water-facing surface 122 in the direction of water flow. In other words, the water-facing surface 122 is inclined relative to the first straight line, and the angle between the water-facing surface 122 and the first straight line is acute. This not only increases the area of the water-facing surface 122, ensuring sufficient contact between the water flow and the water-facing surface 122, but also, by positioning the top of the water-facing surface 122 upstream of the bottom of the water-facing surface 122, it facilitates the fall of intercepted hard foreign objects 100. In extreme cases, even if a button or coin is caught in the water flow and blocked at the inlet of the drainage chamber 121, the inclined configuration of the water-facing surface 122 will allow the foreign object to naturally fall under its own weight when drainage stops.

[0064] For example, when the water pipe 11 is a circular pipe, the water-facing surface 122 is an elliptical surface. In some embodiments, the angle between the water-facing surface 122 and the first straight line is greater than or equal to 30 degrees and less than or equal to 60 degrees. Specifically, it can be 30 degrees, 45 degrees, or 60 degrees.

[0065] When the top of the water-facing surface 122 is located upstream of the bottom of the water-facing surface 122, the water-facing surface 122 can also be set as a curved surface to facilitate smooth sliding of the hard foreign matter 100. The water-facing surface 122 is concave toward the back surface 123, or the water-facing surface 122 is convex toward the back surface 123.

[0066] Example 3

[0067] Figure 7 Embodiment 3 is shown, in which the parts that are the same as or corresponding to those in embodiment 1 are marked with the corresponding reference numerals in embodiment 1. For the sake of simplicity, only the differences between embodiment 3 and embodiment 1 are described. The difference is that the water pipe 11 includes a water inlet section 112 and a filter section 113 arranged in sequence along the flow direction of water, and the filter element 12 is arranged in the filter section 113. The cross-sectional area of the filter section 113 is larger than the cross-sectional area of the water inlet section 112, and the cross-sectional area of the water inlet section 112 is equal to the sum of the outlet areas of the outlet ends of all drainage cavities 121. Water flows in from the water inlet section 112 and flows out through the filter element 12. The flow rate and flow velocity of the water flow remain unchanged. However, when passing through the filter element 12, the water flow is accelerated under the action of the drainage cavity 121, driving the flexible foreign body 200 to pass through faster.

[0068] The water pipe 11 also includes a water outlet section 114, which is arranged downstream of the filter section 113. The cross-sectional area of the water outlet section 114 is equal to the cross-sectional area of the water inlet section 112 to ensure that the flow rate and flow velocity of the water flow remain unchanged. However, when passing through the filter element 12, under the action of the drainage cavity 121, the water flow is accelerated, driving the flexible foreign matter 200 to pass through faster.

[0069] When the inclined filter element 12 is provided, the area of the filter element 12 is increased. After providing multiple drainage cavities 121, even if the cross-sectional area of the water pipe 11 is uniform, it is possible to achieve that the water inlet area of the water pipe 11 is equal to the water outlet area of the filter element 12. In some cases, the water pipe 11 can also be divided into an inlet section 112, a filter section 113, and a water outlet section 114. The filter element 12 is provided in the filter section 113. The cross-sectional area of the filter section 113 is larger than the cross-sectional area of the inlet section 112. The cross-sectional area of the water inlet section 112 is equal to the sum of the water outlet areas of the water outlet ends of all the drainage cavities 121. The water outlet section 114 is provided downstream of the filter section 113. The cross-sectional area of the water outlet section 114 is equal to the cross-sectional area of the water inlet section 112. Figure 8 shown.

[0070] Example 4

[0071] Figure 9 A fourth embodiment is shown, wherein components identical or corresponding to those in the first embodiment are denoted by the corresponding reference numerals. For simplicity, only the differences between the fourth embodiment and the first embodiment are described. The difference lies in that, upstream of the filter element 12, the water inlet area of the water passage 111 gradually decreases along the direction of water flow. This causes the water flow to accelerate upstream of the filter element 12, providing greater power to the flexible member. Furthermore, due to the high water flow velocity, it can flush the filter element 12, facilitating the removal of foreign matter, dust, and other impurities from the filter element 12.

[0072] See also Figure 10 An embodiment of the present invention further provides a drainage assembly, comprising a drain pump 20, a drain pipe 30, a lint filter 40, and the foreign matter filtering structure of any of the above-described embodiments. The drain pump 20 includes a water inlet and a drain outlet; the drain pipe 30 is connected to the water inlet; the water pipe 11 is connected to the drain pipe 30; and the lint filter 40 is disposed on the drain pipe 30, located between the drain pump 20 and the filter element 12. Under the action of the drain pump 20, water flows along the drain pipe 30, passes through the filter element 12 and the lint filter 40 in sequence, and reaches the drain pump 20. The drainage cavity 121 can intercept hard foreign matter 100 and allow flexible foreign matter 200 to pass through at an accelerated rate. The lint filter 40 can filter flexible foreign matter 200, thereby preventing hard foreign matter 100 and flexible foreign matter 200 from reaching the drain pump 20.

[0073] The lint filter 40 may be an existing lint filter device. The drain pipe 30 and the water pipe 11 may be integrally formed or detachably connected.

[0074] The drainage assembly can be used in clothing processing equipment such as washing machines and washer-dryers, and can also be used for drainage in industrial production.

[0075] An embodiment of the present invention further provides a washing machine comprising a housing, an outer drum assembly, and the aforementioned drain assembly. The outer drum assembly includes an outer drum disposed within the housing; a drain pipe 30 is connected to the outer drum at one end remote from the drain pump 20. When the washing machine is draining, water flows from the outer drum into the drain pipe 30, passes through the filter element 12 and the lint filter 40, and reaches the drain pump 20. The drainage cavity 121 intercepts hard foreign matter 100 while allowing flexible foreign matter 200 to pass through at an accelerated rate. The lint filter 40 filters the flexible foreign matter 200, thereby preventing the hard and flexible foreign matter 100 and 200 from reaching the drain pump 20.

[0076] Since there are not many hard foreign objects 100 in the washing machine and they can fall down under the interception of the filter element 12 without affecting the flow of water through the filter element 12, and the flexible foreign objects 200 can accelerate through the filter element 12 without causing blockage of the filter element 12, the foreign matter filtering structure provided in this application can be a maintenance-free structure. No maintenance is required within the service life of the washing machine, thus avoiding frequent disassembly and cleaning.

[0077] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. Foreign matter filtering structure, characterized in that: include: A water passage (11) comprising a water passage (111) extending along a first straight line; A filter element (12) is arranged in the water passage (111), and a plurality of drainage cavities (121) extending parallel to the first straight line are arranged on the filter element (12), and the cross-sectional area of the drainage cavity (121) gradually decreases along the flow direction of water, and the drainage cavity (121) can intercept hard foreign matter (100) and allow flexible foreign matter (200) to pass through at an accelerated speed.

2. The foreign matter filtering structure according to claim 1, characterized in that: One side of the filter element (12) is a water-facing surface (122), the water inlet end of the drainage cavity (121) is arranged on the water-facing surface (122), and the water-facing surface (122) is a flat surface or a curved surface.

3. The foreign matter filtering structure according to claim 2, characterized in that: A water-guiding curved surface (124) is formed at the junction of the drainage cavity (121) and the water-facing surface (122), and water flows into the drainage cavity (121) along the water-guiding curved surface (124).

4. The foreign matter filtering structure according to claim 2, characterized in that: The first straight line extends in a horizontal direction, the water-facing surface (122) is a plane, and the water-facing surface (122) is perpendicular to the first straight line.

5. The foreign matter filtering structure according to claim 2, characterized in that: The first straight line extends in the horizontal direction, the water-facing surface (122) is a plane, and along the flow direction of water, the top end of the water-facing surface (122) is located upstream of the bottom end of the water-facing surface (122).

6. The foreign matter filtering structure according to claim 1, characterized in that: The water pipe (11) and the filter element (12) are integrally formed.

7. The foreign matter filtering structure according to claim 1, characterized in that: The water pipe (11) comprises a water inlet section (112) and a filter section (113) which are arranged in sequence along the flow direction of water; the filter element (12) is arranged on the filter section (113); the cross-sectional area of the filter section (113) is larger than the cross-sectional area of the water inlet section (112); and the cross-sectional area of the water inlet section (112) is equal to the sum of the water outlet areas of the water outlet ends of all drainage chambers (121).

8. The foreign matter filtering structure according to claim 1, characterized in that: Upstream of the filter element (12), along the flow direction of water, the water inlet area of the water passage (111) gradually decreases.

9. A drainage assembly, characterized in that: include: A drainage pump (20), comprising a water inlet and a drainage outlet; a drain pipe (30) connected to the water inlet; The foreign matter filtering structure according to any one of claims 1 to 7, wherein the water pipe (11) is connected to the drain pipe (30); A lint filter (40) is arranged on the drain pipe (30); the lint filter (40) is located between the drain pump (20) and the filter element (12).

10. A washing machine, characterized in that include: Box; An outer cylinder assembly comprises an outer cylinder, wherein the outer cylinder is arranged in the box body; In the drainage assembly described in claim 9, one end of the drainage pipe (30) away from the drainage pump (20) is connected to the outer cylinder.