Pre-filter

Abstract

The utility model belongs to the technical field of water treatment, and discloses a pre-filter which comprises a filter bottle, a filter assembly and a scraping and washing assembly, and the filter bottle is provided with a water inlet and a water outlet; the filter assembly is arranged in the filter bottle, the outlet end of the filter assembly is communicated with the water outlet, and the inlet end is communicated with the water inlet; the scraping and washing assembly comprises a framework, a scraping and washing part and an elastic part, the framework sleeves the filtering assembly and is rotationally connected with the filtering bottle and / or the filtering assembly, a water driving structure is arranged on the framework and can drive the framework to rotate under the action of water flow, the scraping and washing part is arranged on the framework and is used for scraping and washing the filtering bottle and / or the filtering assembly, and the elastic part is connected with the framework. The framework is driven to rotate and reset. According to the pre-filter, water hammer force is used for driving the framework to rotate, the elastic piece is used for converting the water hammer force into elastic potential energy, the elastic potential energy is used for driving the framework to rotate reversely after the water hammer force disappears, scraping and washing in the forward direction and the reverse direction are achieved, the cleaning effect is good, and the water hammer effect eliminating effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a pre-filter. Background Art

[0002] The pre-filter is the first coarse filtration device for the water used in the whole house. It can filter out large particles such as mud, rust, insect eggs, and red worms in tap water. The pre-filter is generally installed at the front end of the pipe. When it is opened or closed, it will produce a water hammer effect. That is, due to the smooth pipe wall, the water flow quickly generates a large water hammer force under the action of inertia, which has a destructive effect on the structure. At present, some pre-filters are installed with a water hammer elimination structure to reduce the water hammer effect and increase the service life of the pre-filter. The water hammer elimination structure is generally installed at the water inlet, and the movement of the spring in a confined space realizes energy absorption and release, thereby reducing the impact of the instantaneous pressure increase of the water hammer, but it will increase the number of structural parts of the pre-filter, resulting in the problem of large product size.

[0003] In addition, the pre-filter is generally equipped with a water pressure-driven scraping component to achieve the purpose of self-cleaning and reduce pre-clogging. However, the contact and scraping amount between the scraper bar and the filter are insufficient, so only one-way scraping can be achieved, and the cleaning effect is poor. Utility Model Content

[0004] The purpose of the utility model is to provide a pre-filter which can solve the problems of a large number of structural parts, a large size and a poor scraping and cleaning effect.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A pre-filter comprising:

[0007] A filter bottle, wherein the filter bottle is provided with a water inlet and a water outlet;

[0008] A filter assembly is disposed in the filter bottle, wherein the outlet end of the filter assembly is connected to the water outlet, and the inlet end of the filter assembly is connected to the water inlet;

[0009] The scraping and cleaning component includes a frame, a scraping and cleaning member and an elastic member. The frame is sleeved outside the filter component and is rotatably connected to the filter bottle and / or the filter component. A water-driven structure is provided on the frame, and the water-driven structure can drive the frame to rotate under the action of water flow. The scraping and cleaning member is provided on the frame and is used to scrape the filter bottle and / or the filter component. The elastic member is connected to the frame and is used to drive the frame to rotate and reset.

[0010] As a preferred solution of the above-mentioned pre-filter, one end of the elastic member is connected to or abuts against the filter assembly or the filter bottle, and the other end of the elastic member is connected to or abuts against the frame;

[0011] And / or, the elastic member is a torsion spring.

[0012] As a preferred solution of the above-mentioned pre-filter, the water-driven structure includes a plurality of water-driven blades, which are arranged at intervals along the circumference of the skeleton. The water-driven blades extend spirally, or the water-driven blades are arranged at an angle to the axis of the skeleton so that the passing water flows in a spiral.

[0013] As a preferred solution of the above-mentioned pre-filter, the water-driven blades are arranged at one end of the frame close to the water inlet;

[0014] Alternatively, the water-driven blades extend from one axial end to the other axial end of the skeleton.

[0015] As a preferred solution of the above-mentioned pre-filter, the pre-filter further comprises a flow guide disposed in the filter bottle, the flow guide being located between the water inlet and the scraping assembly, and the flow guide being used to guide the spiral flow of water.

[0016] As a preferred solution of the above-mentioned pre-filter, the direction in which the water flow is guided by the flow guide is opposite to the direction in which the water flow is guided by the water drive structure;

[0017] And / or, the flow guide is sleeved outside the filter assembly;

[0018] And / or, the guide member includes a confluence groove and multiple drainage outlets connected to the confluence groove, the confluence groove is connected to the water inlet, the multiple drainage outlets are arranged at intervals along the circumference of the filter assembly, and the drainage outlets are arranged at an angle to the axis of the filter bottle.

[0019] As a preferred solution of the above-mentioned pre-filter, a support shaft is provided in the filter bottle, the support shaft is connected to the filter assembly, the skeleton includes a rotating sleeve, the rotating sleeve is sleeved on the support shaft, and the elastic member is sleeved on the support shaft or the rotating sleeve.

[0020] As a preferred solution of the above-mentioned pre-filter, the filter assembly includes a mounting plate and a filter element, the filter element is a cylindrical structure, one axial end of the cylindrical structure is connected to the mounting plate, the inner side of the cylindrical structure is connected to the water outlet, the outer side of the cylindrical structure is connected to the water inlet, and the support shaft is connected to the mounting plate.

[0021] As a preferred embodiment of the pre-filter, the scraping member includes a first cleaning portion, and the first cleaning portion is in contact with the inner wall of the filter bottle;

[0022] And / or, the scraping member includes a second cleaning portion, and the second cleaning portion is in contact with the filter assembly.

[0023] As a preferred solution of the above-mentioned pre-filter, the scraping member is detachably connected to the frame.

[0024] Beneficial effects of the utility model:

[0025] In the pre-filter provided by the utility model, water flow is used to achieve self-drive, which not only simplifies the structure, reduces the size of the pre-filter, and reduces the production and use costs, but also utilizes the water hammer force generated when the water valve is closed and opened, converts the water hammer force into the power for the rotation of the skeleton, improves the cleaning effect, and avoids the water hammer force from damaging the pre-filter or the water valve.

[0026] When water hammer force acts on the water-driven structure, the elastic part is deformed by the force, and the elastic part applies a restoring force on the frame in the opposite direction of the frame's rotation. The water hammer force needs to overcome the elastic force of the elastic part, so that the water hammer force can be further consumed, thereby improving the effect of eliminating the water hammer effect.

[0027] When the water hammer force disappears, the elastic potential energy stored in the deformation of the elastic part will be released, and the elastic part can drive the frame to rotate, driving the scraping and cleaning parts on the frame to move in the opposite direction, thereby achieving reverse cleaning of the filter bottle and / or filter assembly, and achieving better cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a cross-sectional view of the pre-filter provided by the utility model;

[0029] Figure 2 This is a structural schematic diagram of the pre-filter provided by the utility model when the bottle body is not assembled.

[0030] In the picture:

[0031] 10. Bottle body; 20. Water inlet and outlet structure; 21. Tube body; 211. Water inlet; 212. Water outlet; 213. Connecting port; 22. Partition; 30. Filter assembly; 31. Filter element; 32. Mounting plate; 40. Scraping assembly; 41. Frame; 411. Water-driven blades; 42. Scraping element; 43. Elastic element; 50. Guide element; 51. Drainage plate; 60. Base; 61. Support shaft. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0033] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; 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 this utility model based on the specific circumstances.

[0034] 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. Moreover, 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.

[0035] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0036] like Figure 1 As shown, this embodiment provides a pre-filter, including a filter bottle, a filter assembly 30, and a scraping assembly 40. The filter bottle is provided with a water inlet 211 and a water outlet 212. The filter assembly 30 is disposed in the filter bottle. The filter assembly 30 includes an inlet end and an outlet end. The inlet end is connected to the water inlet 211, and the outlet end is connected to the water outlet 212. Water to be filtered enters the filter bottle through the water inlet 211 and is filtered by the filter assembly 30 from the inlet end. The filtered water is discharged from the outlet end through the water outlet 212. The scraping assembly 40 is disposed in the filter bottle and can move under the drive of the water flow to scrape the filter bottle and the filter assembly 30.

[0037] Specifically, the scraping assembly 40 includes a frame 41 and a scraping member 42. The frame 41 is mounted outside the filter assembly 30 and is rotatably connected to at least one of the filter bottle and the filter assembly 30. The frame 41 is provided with a water-driven structure that drives the frame 41 to rotate under the action of water flow. The scraping member 42 is provided on the frame 41 and is used to scrape and clean the filter bottle and the filter assembly 30.

[0038] In this embodiment, as water flows through the filter bottle, it passes through the water-driven structure on the frame 41. The water's action on the water-driven structure causes the frame 41 to rotate, thereby driving the scraper 42 to clean the filter bottle and filter assembly 30, preventing impurities from accumulating in the pre-filter. Utilizing water flow to achieve self-drive not only simplifies the structure and reduces production and operating costs, but also utilizes the water hammer force generated when the water valve is closed and opened, converting this force into rotational power for the frame 41, thereby improving cleaning effectiveness and preventing damage to the pre-filter or water valve caused by the water hammer.

[0039] Optionally, the scraping member 42 includes a first cleaning portion and a second cleaning portion, the first cleaning portion is located on the outside of the skeleton 41, and is used to contact the filter bottle so as to scrape the inner wall of the filter bottle when the skeleton 41 rotates; the second cleaning portion is located on the inside of the skeleton 41, and is used to contact the filter assembly 30 so as to scrape the filter assembly 30 when the skeleton 41 rotates.

[0040] In some embodiments, the scraping member 42 may include only the first cleaning portion to clean the filter bottle, or only the second cleaning portion to clean the filter assembly 30 .

[0041] To improve the absorption and conversion of water hammer forces, the scraping and cleaning assembly 40 further includes an elastic member 43 connected to the frame 41 for driving the frame 41 to rotate and reset. When water hammer forces act on the water-driven structure, the elastic member 43 deforms under the force, exerting a restoring force on the frame 41 in the opposite direction of its rotation. The water hammer force must overcome the elastic force of the elastic member 43, allowing the water hammer force to be further dissipated, thereby improving the effectiveness of eliminating the water hammer effect.

[0042] When the water hammer force disappears, the elastic potential energy stored in the deformation of the elastic member 43 is released, and the elastic member 43 can drive the frame 41 to rotate, causing the scraping member 42 on the frame 41 to move in the opposite direction, thereby achieving reverse cleaning of the filter bottle and / or filter assembly 30. Through the two stages of the water hammer force acting on the frame 41 and the disappearance of the water hammer force and the release of the elastic potential energy, the scraping member 42 can achieve both forward and reverse cleaning of the filter bottle and / or filter assembly 30, thereby achieving a better cleaning effect.

[0043] In this embodiment, one end of the elastic member 43 is connected to or abuts the filter bottle, and the other end of the elastic member 43 is connected to or abuts the frame 41. When the frame 41 rotates relative to the filter bottle, the elastic member 43 is deformed by the torsional force of the frame 41, storing elastic potential energy.

[0044] To ensure more stable rotation of the frame 41, a support shaft 61 is provided within the filter bottle. Support shaft 61 is connected to the filter assembly 30. The frame 41 comprises a frame body and a rotating sleeve connected to the frame body. The frame body comprises a bottom frame and a cylindrical circumferential frame disposed around the bottom frame. The rotating sleeve is connected to the bottom frame. The rotating sleeve is sleeved around the support shaft 61. The cooperation between the rotating sleeve and the support shaft 61 provides rotational support for the frame 41, ensuring that the frame 41 can be stably placed within the filter bottle.

[0045] In order to make the structure of the pre-filter more compact, the elastic member 43 is sleeved outside the rotating sleeve. The rotating sleeve can guide and position the elastic member 43 to ensure the stability of the elastic member 43.

[0046] In this embodiment, the elastic member 43 is a torsion spring having two ends, one of which is connected to the filter bottle and the other is connected to the frame 41 , so as to store elastic potential energy as the frame 41 rotates.

[0047] In other embodiments, the elastic member 43 may be a spring that elastically extends along the axial direction of the rotating sleeve. Alternatively, a plurality of springs may be provided, and the plurality of springs are spaced apart along the circumference of the rotating sleeve to make the skeleton 41 more evenly stressed.

[0048] In this embodiment, the scraping member 42 is detachably connected to the frame 41 to facilitate maintenance and replacement of the scraping member 42. Optionally, the scraping member 42 can also be slidably assembled and fixed to the frame 41. For example, a chute is provided on the circumferential frame of the frame 41. The chute extends roughly along the axial direction of the frame 41. The end of the chute near the water inlet 211 is provided with an open end. The scraping member 42 can be installed into the chute through the open end.

[0049] In some embodiments, the scraping member 42 may also be fixed to the frame 41 by snap-fitting or fasteners.

[0050] like Figure 1 As shown, the water inlet 211 and the water outlet 212 are both located at one axial end of the filter bottle. A support shaft 61 is provided at the end of the filter bottle axially away from the water inlet 211 and the water outlet 212. The support shaft 61 extends through the rotating sleeve and connects to the filter assembly 30. The rotating sleeve is located on the side of the frame facing away from the filter assembly 30, and the elastic member 43 is sleeved outside the rotating sleeve. The rotating sleeve does not occupy the space between the frame 41 and the filter assembly 30, thereby avoiding increasing water flow resistance and affecting the filtering effect of the filter assembly 30.

[0051] In some embodiments, the rotating sleeve can be located on the side of the frame facing the filter assembly 30, and the elastic member 43 can be mounted outside the support shaft 61 on the outside of the skeleton 41 to connect the skeleton 41 and the filter bottle, or the elastic member 43 is mounted outside the rotating sleeve, one end of the elastic member 43 is connected to the filter assembly 30, and the other end is connected to the skeleton 41.

[0052] Specifically, the filter bottle includes a bottle body 10 and a water inlet and outlet structure 20. The water inlet and outlet structure 20 is connected to one axial end of the bottle body 10. The water inlet and outlet structure 20 is provided with a water inlet 211 and a water outlet 212, and is in communication with the interior of the bottle body 10. The scraping assembly 40 and the filtering assembly 30 are both provided in the bottle body 10. The water entering the bottle body 10 through the water inlet 211 needs to be filtered and then returned, and then discharged from the water outlet 212, thereby increasing the flow path of the water in the bottle body 10, improving the filtering effect and consuming the water hammer force.

[0053] In this embodiment, the water inlet and outlet structure 20 includes a tube body 21, which is connected to the bottle body 10 approximately perpendicularly to form a T-shape. One end of the tube body 21 forms a water inlet 211, and the other end of the tube body 21 forms a water outlet 212. A communication port 213 is provided on the circumferential side wall of the tube body 21. The communication port 213 communicates with the bottle body 10 to facilitate the flow of water in and out of the bottle body 10.

[0054] In order to avoid mutual interference between the inlet water flow and the outlet water flow, a partition 22 is provided on the inner wall of the tube body 21. The partition 22 divides the tube body 21 into two sections, namely the inlet pipe section connected to the water inlet 211 and the outlet pipe section connected to the water outlet 212. The other end of the partition 22 extends into the connecting port 213 to separate the connecting port 213 into an inlet hole section and an outlet hole section. The outlet end of the filter component 30 is connected to the outlet hole section, and the inlet hole section is connected to the bottle body 10 and the inlet end of the filter component 30, thereby guiding the flow path of the water flow, separating the outlet water flow and the inlet water flow, and avoiding mutual interference.

[0055] In this embodiment, the filter assembly 30 is cylindrical, with one axial end of the cylindrical filter assembly 30 connected to the water inlet and outlet structure 20, and the other axial end of the cylindrical filter assembly 30 connected to the support shaft 61. The inner side of the cylindrical filter assembly 30 is the downstream filter section, which is connected to the outlet section; the outer side of the cylindrical filter assembly 30 is the upstream filter section, which is connected to the inlet section. Figure 1 In the direction of the middle dotted arrow, water flows into the tube body 21 through the water inlet 211, and then enters the annular gap between the filter bottle and the filter assembly 30 through the inlet section. After passing through the filter assembly 30, the water flows into the inner side of the cylindrical filter assembly 30 and is discharged through the outlet section and the water outlet 212.

[0056] In order to make the water flow into the filter bottle drive the frame 41 to rotate, Figure 2As shown, the water drive structure includes a plurality of water drive blades 411 spaced apart along the circumference of the frame 41. The water drive blades 411 can cause the passing water to flow in a spiral. By providing the plurality of water drive blades 411 to guide the passing water in a spiral flow, the reaction force of the water flow on the frame 41 can drive the frame 41 to rotate about its axis, thereby achieving self-drive of the frame 41 under the action of the water flow.

[0057] In this embodiment, the water-driven blades 411 extend in a spiral to guide the passing water flow, thereby driving the skeleton 41 to rotate. In some embodiments, the water-driven blades 411 are arranged at an angle to the axis of the skeleton 41, so that the force exerted by the water flow on the water-driven blades 411 has a separation extending along the circumference of the skeleton 41, thereby driving the skeleton 41 to rotate.

[0058] In order to improve the driving effect of water flow on the skeleton 41, the water-driven blade 411 is set at one end of the skeleton 41 close to the water inlet 211 to shorten the distance between the water-driven blade 411 and the water inlet 211, thereby making full use of the water hammer force, which is conducive to ensuring the smooth rotation of the skeleton 41.

[0059] In this embodiment, the axial dimension of the water-driven blade 411 along the skeleton 41 is smaller than the axial dimension of the skeleton 41 , that is, the water-driven blade 411 only covers one end of the skeleton 41 to prevent the water-driven blade 411 from interfering with the scraping member 42 on the skeleton 41 .

[0060] In some embodiments, the water-driven blade 411 can extend from one axial end of the skeleton 41 to the other axial end of the skeleton 41. The water-driven blade 411 is longer, has a better effect on guiding the water flow, and can improve the driving effect of the water flow on the skeleton 41.

[0061] Combine Figure 1 and Figure 2 As shown, the pre-filter further includes a flow guide 50 disposed within the filter bottle. The flow guide 50 is located between the water inlet 211 and the scraping and cleaning assembly 40 and is used to guide the water flow into a spiral. By providing the flow guide 50 between the water inlet 211 and the scraping and cleaning assembly 40, the water entering the bottle body 10 through the water inlet 211 can be caused to flow in a spiral, thereby buffering the water flow and reducing water hammer forces, thereby preventing water hammer forces from damaging the pre-filter.

[0062] The outlet section of the tube body 21 is connected to the filter assembly 30, and the flow guide 50 is mounted on the filter assembly 30 to allow water flowing out of the inlet section to directly enter the flow guide 50. Specifically, the flow guide 50 includes a confluence groove and multiple drainage outlets connected to the confluence groove. The confluence groove is connected to the water inlet 211. The multiple drainage outlets are spaced apart along the circumference of the filter assembly 30 and are arranged at an angle to the axis of the filter bottle. The confluence groove is an annular groove and is connected to the multiple drainage outlets to allow water to enter the bottle body 10 along the circumference.

[0063] Optionally, the guide member 50 is provided with a plurality of guide plates 51 surrounding the drainage outlet, and the guide plates 51 are arranged at an angle to the axis of the filter bottle so that the water outlet direction of the drainage outlet is arranged at an angle to the axis of the filter bottle, thereby the water flows in a spiral.

[0064] Optionally, the direction of water flow directed by the flow guide 50 is opposite to that directed by the water drive structure. For example, when the flow guide 50 directs water flow clockwise around the axis of the frame 41, the water drive structure directs water flow counterclockwise around the axis of the frame 41; when the flow guide 50 directs water flow counterclockwise around the axis of the frame 41, the water drive structure directs water flow clockwise around the axis of the frame 41. This arrangement can increase the counteracting force of the water flow under the action of the flow guide 50 and the water drive structure, thereby improving the driving effect on the frame 41.

[0065] In this embodiment, the filter assembly 30 includes a mounting plate 32 and a filter element 31. The filter element 31 is a cylindrical structure, one axial end of which is connected to the mounting plate 32. The inner side of the cylindrical structure is connected to the water outlet 212, and the outer side of the cylindrical structure is connected to the water inlet 211. The support shaft 61 is connected to the mounting plate 32. By providing the cylindrical filter element 31, the effective filtration area of the filter assembly 30 can be increased, the filtration effect on the water flow can be improved, and the flow rate of water through the filter assembly 30 can be guaranteed.

[0066] Optionally, the filter element 31 may be a filter mesh.

[0067] In this embodiment, the pre-filter also includes a base 60 arranged in the filter bottle, which divides the filter bottle into a filter chamber and a sewage discharge chamber. The filter assembly 30 and the scraping assembly 40 are both arranged in the filter chamber. The filter bottle is provided with a sewage discharge port connected to the sewage discharge chamber. The sewage discharge chamber can be connected to the filter assembly 30, that is, the sewage discharge chamber can be connected to the inner side of the cylindrical filter element 31.

[0068] Specifically, the base 60 is disposed within the bottle body 10. The side of the base 60 facing the water inlet and outlet structure 20 serves as a filter chamber, while the side of the base 60 facing away from the water inlet and outlet structure 20 serves as a sewage discharge chamber. A support shaft 61 is disposed on the side of the base 60 facing the filter chamber, and a sewage discharge port is disposed at the end of the bottle body 10 away from the water inlet and outlet structure 20. When the pre-filter is in use, the filter chamber and sewage discharge chamber are disconnected. Water flows through the water inlet 211 into the filter chamber, is filtered by the filter assembly 30, and then flows out through the water outlet 212. When the pre-filter needs to discharge sewage, the sewage discharge chamber is connected to the interior of the filter assembly 30.

[0069] Specifically, the support shaft 61 is provided with a through hole extending axially therethrough, and the mounting plate 32 of the filter assembly 30 is provided with an avoidance hole, which is connected to the through hole to avoid blocking the through hole, so that the through hole can be connected to the interior of the filter assembly 30 .

[0070] Optionally, a shutoff valve assembly is provided within the drainage chamber to selectively connect the drainage port to the drainage chamber, so that drainage can be achieved when necessary. When the pre-filter is in normal use, the drainage port is disconnected from the drainage chamber, and water entering the pre-filter flows out through the water outlet 212 after being filtered.

[0071] It should be noted here that the on-off valve assembly is a prior art in this field and will not be described in detail in this embodiment.

[0072] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A pre-filter, characterized in that: include: A filter bottle, wherein the filter bottle is provided with a water inlet (211) and a water outlet (212); A filter assembly (30) is disposed in the filter bottle, wherein the outlet end of the filter assembly (30) is in communication with the water outlet (212), and the inlet end of the filter assembly (30) is in communication with the water inlet (211); The scraping assembly (40) comprises a frame (41), a scraping member (42) and an elastic member (43). The frame (41) is sleeved outside the filter assembly (30) and is rotatably connected to the filter bottle and / or the filter assembly (30). The frame (41) is provided with a water drive structure, which can drive the frame (41) to rotate under the action of water flow. The scraping member (42) is provided on the frame (41) and is used to scrape the filter bottle and / or the filter assembly (30). The elastic member (43) is connected to the frame (41) and is used to drive the frame (41) to rotate and reset.

2. The prefilter according to claim 1, characterized in that One end of the elastic member (43) is connected to or abuts against the filter assembly (30) or the filter bottle, and the other end of the elastic member (43) is connected to or abuts against the frame (41); And / or, the elastic member (43) is a torsion spring.

3. The prefilter according to claim 1, characterized in that The water drive structure comprises a plurality of water drive blades (411), which are arranged at intervals along the circumference of the skeleton (41). The water drive blades (411) extend in a spiral manner, or the water drive blades (411) are arranged at an angle to the axis of the skeleton (41), so that the water flow passing through the structure flows in a spiral manner.

4. The pre-filter according to claim 3, characterized in that: The water-driven blade (411) is arranged at one end of the frame (41) close to the water inlet (211); Alternatively, the water-driven blade (411) extends from one axial end to the other axial end of the skeleton (41).

5. The pre-filter according to any one of claims 1 to 4, characterized in that: The pre-filter further comprises a flow guide (50) arranged in the filter bottle, the flow guide (50) being located between the water inlet (211) and the scraping assembly (40), and the flow guide (50) being used to guide the water flow to flow in a spiral.

6. The pre-filter according to claim 5, characterized in that: The direction in which the flow guide (50) guides the water flow is opposite to the direction in which the water drive structure guides the water flow; And / or, the flow guide (50) is sleeved outside the filter assembly (30); And / or, the guide member (50) includes a confluence groove and a plurality of drainage outlets connected to the confluence groove, the confluence groove is connected to the water inlet (211), the plurality of drainage outlets are arranged at intervals along the circumference of the filter assembly (30), and the drainage outlets are arranged at an angle to the axis of the filter bottle.

7. The pre-filter according to any one of claims 1 to 4, characterized in that: A support shaft (61) is provided in the filter bottle, the support shaft (61) is connected to the filter assembly (30), the skeleton (41) includes a rotating sleeve, the rotating sleeve is sleeved on the support shaft (61), and the elastic member (43) is sleeved on the support shaft (61) or the rotating sleeve.

8. The pre-filter according to claim 7, characterized in that: The filter assembly (30) comprises a mounting plate (32) and a filter element (31); the filter element (31) is a cylindrical structure; one axial end of the cylindrical structure is connected to the mounting plate (32); the inner side of the cylindrical structure is connected to the water outlet (212); the outer side of the cylindrical structure is connected to the water inlet (211); and the support shaft (61) is connected to the mounting plate (32).

9. The pre-filter according to any one of claims 1 to 4, characterized in that: The scraping member (42) includes a first cleaning portion, and the first cleaning portion is in contact with the inner wall of the filter bottle; And / or, the scraping member (42) includes a second cleaning portion, and the second cleaning portion is in contact with the filter assembly (30).

10. The pre-filter according to any one of claims 1 to 4, characterized in that: The scraping member (42) is detachably connected to the frame (41).

Images