A pre-filter that can be cleaned in all directions

Abstract

The present invention relates to a pre-filter that can be cleaned in all directions, belonging to the field of filter technology. The toothed cleaning part rotates along an eccentric trajectory under the drive of the crank part, and the tooth profile of the cleaning part is accurately cut into the grooves and angle areas of the toothed filter component through an intermittent meshing mechanism. The path deviation of the eccentric rotation is used to force the cleaning part to periodically penetrate into geometric dead corners that traditional scrapers cannot reach; and with the help of the multi-directional extension characteristics of the crank movement, full coverage scraping in three-dimensional space is achieved, and residues on the surface of the filter are completely eliminated, effectively solving the cleaning blind spot problem of the mechanical scraper in the existing scraping and washing structure that cannot cover complex areas such as the grooves and angles of the filter. In addition, multi-directional scraping can reduce single-point pressure and wear on the filter because the scraping force is dispersed over a larger area of ​​the filter, reducing the risk of damage to the filter material, and scraping in different directions helps to destroy the dirt structure on the filter, making it easier for dirt to fall off the filter.

Description

Technical Field

[0001] The invention belongs to the technical field of filters, and in particular relates to a pre-filter capable of being cleaned in all directions. Background Art

[0002] As the first barrier of the water treatment system, the core function of the pre-filter is to intercept large particles of impurities such as mud, rust, etc. in the pipeline to prevent blockage or damage to downstream equipment. The current mainstream filtration cleaning structures can be divided into three categories: the first is the direct-wash structure, which uses forward water flow to flush impurities on the surface of the filter screen and relies on the impact force of the water flow to achieve sewage discharge, but the cleaning effect on attached particles is limited; the second is the backwash structure, which switches the direction of the water flow to reversely flush the filter screen. Although it can improve the cleaning effect, it requires higher water pressure and there are residual dead corners at the bottom of the filter screen; the third is the scraping structure, which adds a mechanical scraper to rotate and scrape the inner wall of the filter screen, using physical friction to efficiently remove impurities.

[0003] For scenarios with poor water quality or a lot of impurities, the scraping and washing structure has become the mainstream choice because of its advantages of frequent cleaning and maintenance without disassembling the equipment, which significantly improves the filtration efficiency and ease of use. However, this structure still has significant defects: the rotation trajectory of the mechanical scraper is difficult to cover complex areas such as filter grooves and corners, resulting in long-term fouling in cleaning blind spots; at the same time, the continuous friction between the scraper and the inner wall of the filter can easily cause damage to the filter material, especially when the filter strength is insufficient or the hardness of the impurities is high, frequent scraping may cause the filter to rupture, which in turn aggravates the decline in filtration performance. Therefore, how to achieve dead-angle coverage and cleaning of the filter and reduce mechanical wear while maintaining efficient cleaning capabilities has become a technical problem that needs to be solved urgently. Summary of the Invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a pre-filter that can be cleaned in all directions, which solves the problem in the prior art that the rotation trajectory of the mechanical scraper is difficult to cover complex areas such as filter grooves and corners, resulting in long-term fouling in cleaning blind areas.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A pre-filter that can be cleaned in all directions comprises a filter housing, a toothed filter assembly arranged in the filter housing, and an eccentric rotating mechanism arranged below the toothed filter screen. The eccentric rotating mechanism is used to clean the toothed filter screen in all directions. The eccentric rotating mechanism comprises a rotating support part, a crank part, and a toothed cleaning part arranged on the filter housing below the toothed filter assembly. The two ends of the crank part are respectively connected to the rotating support part and the toothed cleaning part. The rotating support part drives the crank part to rotate, and the teeth on the toothed cleaning part driven by the crank part intermittently cooperate with the teeth on the toothed filter assembly, so that the toothed filter assembly is covered and cleaned without dead angles.

[0007] As a further solution of the present invention, the toothed filter assembly includes a support block and a toothed filter screen. The support block is provided with a first groove, the first groove matches the toothed filter screen, and the toothed filter screen is arranged in the first groove.

[0008] As a further solution of the present invention, the toothed cleaning portion includes a toothed ring and a plurality of cleaning brushes arranged on the toothed ring, and an arc structure transition is formed between the toothed ring and two adjacent teeth of the toothed filter.

[0009] As a further solution of the present invention, the number of teeth on the toothed filter screen is one more than the number of teeth on the toothed ring.

[0010] As a further solution of the present invention, the rotating support part includes a rotating ring and several guide rods vertically arranged on the rotating ring, and the toothed ring is provided with several second grooves. The guide rods are located in the second grooves, and the guide rods are in contact with the inner walls of the second grooves.

[0011] As a further solution of the present invention, the number of the guide rods is half the number of the teeth on the toothed ring.

[0012] As a further solution of the present invention, a filling block is rotatably provided at the center of the toothed ring, and the center of the filling block is rotatably connected to the end of the crank portion.

[0013] As a further solution of the present invention, the diameter of the toothed filter is larger than the diameter of the toothed ring, and the angle between the tooth top and the tooth root of the toothed filter is the same as the angle between the tooth top and the tooth root of the toothed ring.

[0014] As a further solution of the present invention, the diameter of the guide rod on the rotating ring matches the diameter of the filter holes on the toothed filter screen.

[0015] The beneficial effects of the present invention are:

[0016] Driven by the crank, the toothed cleaning section rotates along an eccentric trajectory, and the intermittent meshing mechanism enables the teeth of the cleaning section to precisely cut into the grooves and corners of the toothed filter assembly. The path deviation of the eccentric rotation is used to force the cleaning section to periodically penetrate geometric blind spots that traditional scrapers cannot reach. At the same time, the eccentric rotating mechanism is located below the toothed filter assembly and is smaller than the filter screen. It not only avoids interfering with the filtered water flow by reserving a distance, but also uses the multi-directional extension characteristics of the crank motion to achieve full coverage scraping in three-dimensional space, completely eliminating residue on the surface of the filter screen, and effectively solving the cleaning blind spot problem of the mechanical scraper in the existing scraping and washing structure that cannot cover complex areas such as the grooves and corners of the filter screen. In addition, multi-directional scraping can reduce single-point pressure and wear on the filter screen, because the scraping force is dispersed over a larger area of ​​the filter screen, reducing the risk of damage to the filter screen material. Scraping in different directions helps to destroy the dirt structure on the filter screen, making it easier for dirt to fall off the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the eccentric rotating mechanism of the present invention;

[0020] Figure 3 This is a schematic structural diagram of the toothed filter assembly of the present invention;

[0021] Figure 4 This is a schematic structural diagram of the tooth-shaped cleaning portion of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the rotating support part of the present invention.

[0023] Description of main component symbols:

[0024] In the figure: 1. Head; 2. Filter housing; 3. Toothed filter assembly; 31. Support block; 32. Toothed filter screen; 33. First groove; 4. Eccentric rotating mechanism; 41. Rotating support part; 411. Rotating ring; 412. Guide rod; 413. Second groove; 42. Crank part; 43. Toothed cleaning part; 431. Toothed ring; 432. Cleaning brush; 5. Drain port; 6. Control valve; 7. Automatic flushing structure; 8. Filling block. DETAILED DESCRIPTION

[0025] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0026] See also Figure 1 - Figure 5 , this embodiment provides a pre-filter that can be cleaned in all directions, including a filter housing 2, a toothed filter assembly 3 arranged in the filter housing 2, and an eccentric rotating mechanism 4 arranged below the toothed filter screen 32. The eccentric rotating mechanism 4 is used to clean the toothed filter screen 32 in all directions. The eccentric rotating mechanism 4 includes a rotating support part 41, a crank part 42 and a toothed cleaning part 43 arranged on the filter housing 2 below the toothed filter assembly 3. The two ends of the crank part 42 are respectively connected to the rotating support part 41 and the toothed cleaning part 43. The rotating support part 41 drives the crank part 42 to rotate, and the crank part 42 drives the teeth on the toothed cleaning part 43 to intermittently cooperate with the teeth on the toothed filter assembly 3, so that the toothed filter assembly 3. Cleaning without dead angles, wherein the eccentric rotating mechanism 4 is located below the toothed filter assembly 3, and is used to clean the toothed filter assembly 3 without dead angles, but it does not affect the flow of water after the toothed filter assembly 3 has been filtered. A certain distance is left between the first eccentric rotating mechanism 4 and the toothed filter assembly 3, and the size of the second eccentric rotating mechanism 4 is smaller than the toothed filter assembly 3, so it does not affect the flow of water after the toothed filter assembly 3 has been filtered. The purpose of using the crank portion 42 is to enable the toothed cleaning portion 43 to rotate while intermittently moving to complex areas such as the grooves and folded corners of the toothed filter assembly 3, so that the cleaning portion can perform all-round cleaning on complex areas such as the grooves and folded corners of the toothed filter assembly 3.

[0027] In addition, it should be noted that the above-mentioned all-round cleanable pre-filter, in addition to the filter housing 2, the toothed filter assembly 3 arranged in the filter housing 2 and the eccentric rotating mechanism 4 arranged under the filter screen, also includes a machine head 1, a sewage outlet 5, a control valve 6 and an automatic flushing structure 7, wherein the top part of the pre-filter of the machine head 1 includes a water inlet and outlet, as well as an interface for connecting pipes, the filter housing 2 is a filter bottle, which is the main part of the pre-filter and is transparent or translucent so that the user can observe the filtering situation, the sewage outlet 5 is located at the bottom of the filter housing 2, and is used to discharge impurities trapped during the filtration process, the sewage outlet 5 is equipped with a valve for controlling the opening and closing of the sewage discharge, the control valve 6 is used to control the functions of water inlet and outlet and sewage discharge, and the automatic flushing structure 7 includes an automatic sewage valve, a pressure difference detection unit, a flow detection unit, a timing unit and a control unit, which can automatically monitor the water quality and filtration situation, and automatically flush the filter screen when necessary, such as Figure 1 shown.

[0028] At present, for scenarios with poor water quality or a lot of impurities, the scraping and washing structure has become the mainstream choice because of its advantages of frequent cleaning and maintenance without disassembling the equipment, which has significantly improved the filtration efficiency and ease of use. However, this structure still has significant defects: the rotation trajectory of the mechanical scraper is difficult to cover complex areas such as filter grooves and corners, resulting in long-term fouling in cleaning blind spots; at the same time, the continuous friction between the scraper and the inner wall of the filter can easily cause damage to the filter material. Especially when the filter strength is insufficient or the hardness of the impurities is high, frequent scraping may cause the filter to rupture, which in turn aggravates the decline in filtration performance.

[0029] To address the aforementioned issues, in this embodiment, the toothed cleaning portion 43 rotates along an eccentric trajectory driven by the crank portion 42. The intermittent meshing mechanism allows the teeth of the cleaning portion to precisely cut into the grooves and corners of the toothed filter assembly 3. The path deviation of the eccentric rotation forces the cleaning portion to periodically penetrate geometric blind spots that are inaccessible to conventional scrapers. Furthermore, the eccentric rotating mechanism 4 is located below the toothed filter assembly 3 and is smaller than the filter screen. This not only prevents interference with the filtered water flow by reserving a distance, but also leverages the multi-directional extension of the crank motion to achieve full three-dimensional scraping, completely eliminating residue on the filter screen surface. This effectively addresses the problem of mechanical scrapers in existing scraping and washing structures being unable to reach complex areas such as filter screen grooves and corners. Furthermore, multi-directional scraping reduces single-point pressure and wear on the filter screen because the scraping force is dispersed over a larger area, reducing the risk of damage to the filter material. Furthermore, scraping in different directions helps to disrupt the dirt structure on the filter screen, making it easier for dirt to fall off the filter screen.

[0030] In the actual filtration process, since the target is a scenario with poor water quality or a lot of impurities, the particles in the water are deposited on the filter screen, and the distribution of these particles is often uneven. Some areas have more particle accumulation, which will cause the filter screen in this area to be under greater pressure, while other areas are relatively lighter. This uneven pressure distribution will cause the filter screen to deform, resulting in a decrease in cleaning efficiency. In order to solve this problem, in one embodiment, the toothed filter assembly 3 includes a support block 31 and a toothed filter screen 32, and a first groove 33 is provided on the support block 31. The first groove 33 matches the toothed filter screen 32, and the toothed filter screen 32 is arranged in the first groove 33. Through the precise cooperation between the groove and the filter screen, the filter screen is prevented from displacement or deformation under the drive of the eccentric rotating mechanism 4, thereby ensuring the meshing accuracy of the filter screen and the cleaning part during the cleaning process.

[0031] In order to better eliminate cleaning blind spots and achieve full coverage, in one embodiment, the toothed cleaning portion 43 includes a toothed ring 431 and a plurality of cleaning brushes 432 arranged on the toothed ring 431. The toothed ring 431 and the adjacent two teeth of the toothed filter 32 are transitioned by an arc structure. The arc transition design reduces the impact force when the cleaning brush 432 contacts the filter, avoiding filter wear caused by hard scraping. In addition, when the cleaning brush 432 moves with the toothed ring 431, the arc trajectory can guide the bristles to penetrate into the filter grooves and corner areas, covering geometric dead corners that traditional scrapers cannot reach.

[0032] In addition, during the process of cleaning the filter by the toothed cleaning part 43, in order to ensure that there are no dead angles, each position of the filter can be cleaned, so continuous periodic cleaning is required to avoid omissions. In this regard, in one embodiment, the number of teeth on the toothed filter 32 is one more than the number of teeth on the toothed ring 431, and the number of teeth of the toothed filter 32 is one more than the number of teeth on the toothed ring 431, forming an asymmetric meshing relationship. Due to the difference in the number of teeth, the meshing position of the cleaning part tooth shape and the filter tooth shape is periodically offset with each rotation, ensuring that each filter tooth groove can be covered by the cleaning brush 432, and dead angle cleaning of the entire tooth groove is achieved through dynamic meshing.

[0033] Furthermore, in order to ensure that the rotating support part 41 can maintain stable movement when the cleaning part moves, and avoid vibration noise or component displacement due to unstable movement, in one embodiment, the rotating support part 41 includes a rotating ring 411 and a plurality of guide rods 412 vertically arranged on the rotating ring 411, and a plurality of second grooves 413 are provided on the toothed ring 431. The guide rods 412 are located in the second grooves 413, and the guide rods 412 are in contact with the inner walls of the second grooves 413. The close fit between the guide rods 412 and the grooves here limits the radial shaking of the toothed ring 431, ensuring the precise engagement of the cleaning brush 432 with the filter screen. The guide rods 412 evenly transmit the driving force of the rotating support part 41 to the toothed ring 431, avoiding local stress concentration and component fatigue.

[0034] In order to avoid increased energy consumption due to uneven weight of the multi-rod structure, in one embodiment, the number of guide rods 412 is half the number of teeth on the toothed ring 431. On the one hand, this design can reduce the number of guide rods 412 to reduce the inertial resistance of the rotating support part 41 and improve the driving efficiency. On the other hand, the number of symmetrically distributed guide rods 412 is matched with the ratio of the number of teeth to ensure torque balance during rotation, reduce vibration, and achieve a high efficiency energy consumption ratio by optimizing the number of rods.

[0035] Since the eccentric mechanism is prone to wear due to sliding friction, in order to reduce wear and increase the service life of the eccentric rotating mechanism 4, in one embodiment, a filling block 8 is rotatably provided at the center of the toothed ring 431, and the center of the filling block 8 is rotatably connected to the end of the crank portion 42. The filling block 8 serves as a fulcrum for the crank drive, converting the circular motion of the crank into the eccentric swing of the toothed ring 431, thereby expanding the range of the cleaning trajectory. The rotating connection design of the filling block 8 reduces the sliding friction between the crank and the toothed ring 431, thereby extending the service life of the components, reducing the friction coefficient through the rotating connection, and improving durability.

[0036] Since the cleaning mechanism may get stuck during the cleaning process due to the size mismatch between the filter screen and the toothed ring 431, affecting the cleaning effect and service life, in order to avoid this problem, in one embodiment, the diameter of the toothed filter screen 32 is larger than the diameter of the toothed ring 431, and the angle between the tooth top and the tooth root of the toothed filter screen 32 is the same as the angle between the tooth top and the tooth root of the toothed ring 431. The larger diameter of the filter screen can ensure that the cleaning brush 432 fully contacts the inner wall of the filter screen, and the angle matching can avoid jamming caused by excessive engagement. The size difference between the filter screen and the toothed ring 431 can also provide a smooth channel for the filtered water flow, avoiding interference of the cleaning mechanism on the water flow.

[0037] It is worth mentioning that since the pre-filter is used in scenarios with poor water quality or a lot of impurities, when the pre-filter is used for a long time, impurities are more likely to get stuck in the filter holes in this scenario, causing the traditional filter to require frequent cleaning and maintenance. In order to solve this problem, in one embodiment, the diameter of the guide rod 412 on the rotating ring 411 is matched with the diameter of the filter holes on the toothed filter 32. Here, the diameter of the guide rod 412 on the rotating ring 411 is matched with the diameter of the filter holes on the toothed filter 32, which means that the guide rod 412 on the rotating ring 411 can just pass through the filter holes on the toothed filter 32. On the one hand, the guide rod 412 can scrape the edge of the filter hole during rotation to assist in removing residual impurities in the hole. On the other hand, the diameter of the guide rod 412 matches the filter hole, which can prevent impurities from getting stuck in the gap between the guide rod 412 and the filter, reducing the maintenance frequency. In addition, the self-cleaning ability is improved through the synergistic effect of the guide rod 412 and the filter hole.

[0038] One point that needs to be supplemented is that this application achieves full coverage cleaning of the filter grooves and corners through designs such as arc transition, difference in the number of teeth, and eccentric movement. The guide rod 412 constraint, rotation connection, tooth shape matching and other technologies reduce friction loss and extend the life of the filter and cleaning components. The size difference between the filter and the cleaning mechanism and the optimization of the guide rod 412 diameter ensure that the filtered water flows smoothly and avoids pressure drop loss. The multi-dimensional design not only improves the cleaning efficiency, but also takes into account the equipment reliability and maintenance convenience, and is suitable for long-term stable operation of high-impurity water quality.

[0039] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A pre-filter capable of all-around cleaning, characterized in that: The invention comprises a filter housing and a toothed filter assembly arranged in the filter housing, wherein the toothed filter assembly comprises a support block and a toothed filter screen, wherein the support block is provided with a first groove, the first groove matches the toothed filter screen, and the toothed filter screen is arranged in the first groove; The eccentric rotating mechanism is provided below the toothed filter screen, and the eccentric rotating mechanism is used to clean the toothed filter screen in all directions. The eccentric rotating mechanism includes a rotating support portion, a crank portion and a toothed cleaning portion provided on the filter housing below the toothed filter assembly. The two ends of the crank portion are respectively connected to the rotating support portion and the toothed cleaning portion. The rotating support portion drives the crank portion to rotate, and the crank portion drives the teeth on the toothed cleaning portion to intermittently cooperate with the teeth on the toothed filter assembly, so that the toothed filter assembly is covered and cleaned without dead angles. The toothed cleaning part includes a toothed ring and a plurality of cleaning brushes arranged on the toothed ring. The toothed ring and two adjacent teeth of the toothed filter are transitioned by an arc structure; the number of teeth on the toothed filter is one more than the number of teeth on the toothed ring.

2. The omnidirectional cleanable pre-filter according to claim 1, characterized in that: The rotating support portion includes a rotating ring and a plurality of guide rods vertically arranged on the rotating ring. The toothed ring is provided with a plurality of second grooves. The guide rods are located in the second grooves and fit the inner walls of the second grooves.

3. The omnidirectional cleanable pre-filter according to claim 2, characterized in that: The number of the guide rods is half the number of the teeth on the toothed ring.

4. The omnidirectional cleanable pre-filter according to claim 2, characterized in that: A filling block is rotatably provided at the center of the toothed ring, and the center of the filling block is rotatably connected to the end of the crank portion.

5. The omnidirectional cleanable pre-filter according to claim 1, characterized in that: The diameter of the toothed filter screen is greater than the diameter of the toothed ring, and the angle between the tooth top and the tooth root of the toothed filter screen is the same as the angle between the tooth top and the tooth root of the toothed ring.

6. The omnidirectional cleanable pre-filter according to claim 2, characterized in that: The diameter of the guide rod on the rotating ring matches the diameter of the filter holes on the toothed filter screen.

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