A self-cleaning filter

Abstract

This utility model discloses a self-cleaning filter, including a shell, an inner cavity, and a filter screen disposed within the inner cavity. The filter screen divides the inner cavity into a first chamber and a second chamber. A rotatable mounting bracket is provided on one side of the filter screen's filter surface. The mounting bracket is equipped with a cleaning brush and an impeller. The impeller drives the mounting bracket to rotate under the impact of the flowing medium, allowing the cleaning brush to simultaneously clean impurities from the filter screen's filter surface. The filter screen is preferably a rotating body, with guide components at its upper and lower ends to limit and prevent deformation. A sewage discharge channel is provided at the bottom of the second chamber; the impeller is driven by an additional compressed air channel. The mounting bracket forms a rotating pair with the support tube and connecting rod through a bushing. The connecting rod is equipped with an axial limiting mechanism or an hourglass-shaped rotating body structure to ensure rotational stability. This utility model utilizes the kinetic energy of the medium to achieve simultaneous filtration and self-cleaning, requiring no external power, and features high-efficiency cleaning, low energy consumption, and an anti-displacement design.

Description

Technical Field

[0001] This utility model relates to the field of filtration equipment technology, and in particular to a self-cleaning filter. Background Technology

[0002] In industrial production, water treatment, petrochemicals, food processing, and other fields, filtration equipment is widely used to remove impurities from liquids or gases to ensure stable system operation and improve product quality. Traditional filters typically employ a fixed filter screen structure. When the medium passes through, solid particles are trapped on the filter screen surface. As filtration continues, impurities accumulate, leading to filter screen blockage, increased pressure drop, and decreased filtration efficiency. At this point, it is necessary to stop the machine, disassemble the filter screen for cleaning or replacement, which not only affects production efficiency but also increases maintenance costs.

[0003] Therefore, given the shortcomings of existing technologies, it is necessary to design a self-cleaning filter to solve the above problems.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solution of this utility model and facilitating the understanding of those skilled in the art. It should not be assumed that the above content is known to those skilled in the art simply because it has been described in the background section of this utility model. Utility Model Content

[0005] To overcome the shortcomings of the prior art, the present invention discloses a self-cleaning filter, the core design of which is to use the kinetic energy of the medium itself to drive the cleaning mechanism, so as to realize the simultaneous operation of filtration and self-cleaning without relying on external power, while improving cleaning efficiency and filtration stability.

[0006] This utility model discloses a self-cleaning filter, including a housing with an inner cavity containing a filter screen. A rotatable mounting bracket is provided on one side of the filter screen's filtering surface. The mounting bracket has a cleaning brush that contacts the filter screen during rotation. An impeller is also provided on the mounting bracket, which rotates under the impact of flowing media. It is important to note that the filter screen's filtering surface refers to the side of the filter screen that the media first contacts and flows through. This surface directly bears the impact force and contaminant load of the media. The phrase "one side of the filter screen's filtering surface" refers to the entire filtering surface, not just its side in any direction. For example, when the filter screen is cylindrical, the mounting bracket can be positioned on one side of the cylindrical filter screen's filtering surface or it can be arranged around the filter screen's filtering surface.

[0007] Preferred technical solution: The filter screen is shaped as a cylinder, a cone, or a truncated cone, which makes it easier for the cleaning brush on the mounting bracket to contact the filter screen surface and improve the cleaning effect.

[0008] A preferred technical solution: Both the upper and lower ends of the filter screen are equipped with annularly distributed guide components. Each guide component includes multiple guide posts evenly arranged along the circumference of the filter screen. The ends of the guide posts are rotatably connected to the mounting frame, and the outer circumference of the guide posts is rollably connected to the filter screen surface. The guide posts provide circumferential limiting and guidance for the filter screen, preventing deformation and reducing friction between the mounting frame and the filter screen.

[0009] A preferred technical solution: The filter screen divides the inner cavity into a first chamber and a second chamber. The first chamber is connected to the outside of the housing through a media outlet for discharging the filtered media. The second chamber is connected to the outside of the housing through a media inlet for introducing the media to be filtered. A drain channel connected to the outside of the housing is provided at the bottom of the second chamber for centralized discharge of impurities. It should be noted that the drain channel can be controlled to open and close using common techniques in the art, such as valves, plugs, or bolts.

[0010] Preferred technical solution: The impeller blades are located between the second cavity and the medium inlet, which improves the driving effect of the medium on the blades. Especially when the medium outlet is closed and the sewage discharge channel is open, the medium can still flow through the impeller blades to drive its rotation.

[0011] Preferred technical solution: An air intake channel is provided at the corresponding position of the housing and the impeller blades. The air intake channel is connected to a compressed air source. The compressed air drives the impeller to rotate. Cleaning agent can be mixed into the compressed air to ensure and improve the cleaning efficiency of the cleaning brush on the filter screen.

[0012] Preferred technical solution: The impeller blades are arc-shaped blades, with the concave surface of the arc-shaped blades facing the rear side of the impeller rotation direction, thereby improving the medium driving efficiency and effectively reducing energy loss.

[0013] Preferred technical solution: A support tube is also provided inside the cavity. The upper end of the support tube is fixedly connected to the top of the shell and communicates with the medium outlet. The support tube has an opening that communicates with the first cavity. A connecting rod is coaxially provided at the bottom of the support tube. The lower end of the connecting rod is connected to the filter screen. The upper end of the mounting bracket forms a rotating pair with the outer periphery of the support tube through a bushing. The lower end of the mounting bracket forms a rotating pair with the connecting rod through a bushing, ensuring the rotational stability of the mounting bracket.

[0014] The preferred technical solution is as follows: An axial limiting mechanism is fitted onto the connecting rod, with the axial limiting mechanism located on both the upper and lower sides of the bushing. This ensures the flexibility of the mounting bracket's rotation while effectively preventing dislocation.

[0015] The preferred technical solution is as follows: the connecting rod is equipped with an hourglass-shaped rotating structure, and the lower end of the mounting bracket forms a rotating pair with the rotating structure through a bushing. This ensures the flexibility of the mounting bracket's rotation while effectively preventing dislocation.

[0016] Working principle: Filtration—The medium to be filtered flows into the second chamber from the medium inlet, and enters the first chamber through the filter screen under pressure. Impurities are trapped on the filter screen surface, and the filtered clean medium is discharged through the first chamber and the medium outlet. Self-cleaning process—During the flow of the medium, the impeller blades drive the mounting frame to rotate, which in turn drives the cleaning brush to remove attached impurities along the filter screen. The impurities are deposited at the bottom of the second chamber under gravity and are periodically discharged through the drain channel. If the kinetic energy of the medium is insufficient, compressed air can be introduced through the air intake channel to assist the drive. At the same time, when there is no medium entering the medium inlet, compressed air can be introduced separately through the air intake channel for drive, and cleaning agent can be mixed into the compressed air to improve the cleaning effect.

[0017] Due to the application of the above technical solution, the beneficial effects of this utility model compared with the prior art are as follows: 1) The impeller is directly driven by the kinetic energy of the medium to rotate the cleaning brush, achieving simultaneous filtration and cleaning without the need for an additional motor or power unit, thus reducing energy consumption and maintenance costs. It is especially suitable for medium systems with stable pipeline pressure.

[0018] 2) By introducing compressed air through the intake channel, the driving force is enhanced to ensure efficient cleaning in low-flow and high-viscosity media environments, thus broadening the application scope.

[0019] 3) When the cleaning brush is designed as a columnar roller brush structure, it makes uniform contact with the filter screen surface when rotating, achieving efficient cleaning and reducing wear.

[0020] 4) Use the mounting bracket to drive the cleaning brush to rotate the filter screen for cleaning. During the cleaning process, the filter screen remains stationary, which can avoid the filter screen causing radial shearing of the media flow and improve the media filtration efficiency.

[0021] 5) An additional support tube is added inside the cavity to serve as the support shaft for the mounting bracket, simplifying the structure; the upper and lower ends of the mounting bracket form a rotating pair with the outer periphery of the support tube and the connecting rod part respectively through bushings, and work in conjunction with the axial limiting mechanism of the connecting rod to effectively prevent dislocation while ensuring flexible rotation.

[0022] 6) The filter screen is circumferentially guided by a ring-shaped guide assembly to prevent filter screen deformation; the guide post and the filter screen are connected by a rolling connection to reduce motion resistance.

[0023] 7) The bottom of the second chamber is equipped with an openable and closable sewage discharge channel to facilitate the centralized cleaning of impurities.

[0024] 8) The mounting bracket with a cleaning brush meets the cleaning needs of both rotating and non-rotating filter scenarios. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is an exploded view of a self-cleaning filter according to the present invention; Figure 2 This is a front view of a self-cleaning filter according to the present invention; Figure 3 This is a longitudinal sectional view of a self-cleaning filter according to the present invention; Figure 4 This is a schematic diagram of the assembly of the filter screen and the mounting bracket in this utility model.

[0027] In the above attached figures, 1 is the shell; 11 is the inner cavity; 111 is the first cavity; 112 is the second cavity; 12 is the medium outlet; 13 is the medium inlet; 14 is the sewage discharge channel; 15 is the air intake channel; 16 is the threaded hole; 2 is the filter screen; 3 is the mounting bracket; 31 is the guide column; 4 is the cleaning brush; 5 is the impeller; 6 is the support pipe; 7 is the connecting rod; and 71 is the rotating structure. Detailed Implementation

[0028] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the purposes of describing embodiments of this application herein. Furthermore, the terms "comprising" and "having," and their synonyms, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] In this application, the terms "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this utility model and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0031] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0032] Furthermore, the terms "installation," "setting," "equipped with," "connection," "linking," "fitting," and "fitting" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Similarly, "fitting" can mean completely or partially fitted. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] Example 1: like Figure 1 , Figure 2 and Figure 3 As shown, this utility model discloses a self-cleaning filter, including a housing 1, a filter screen 2, a mounting bracket 3, a cleaning brush 4, and an impeller 5; the main components of this utility model will be described in detail below: The housing 1 is made of stainless steel and has an internal cylindrical cavity 11. A cylindrical filter screen 2 is installed inside the cavity 11, dividing the cavity 11 into a first cavity 111 and a second cavity 112. The first cavity 111 is connected to the media outlet 12 for discharging the filtered clean media, and the second cavity 112 is connected to the media inlet 13 for introducing the media to be filtered. It should be noted that the internal cavity 11 is cylindrical in this embodiment to improve the utilization rate of the internal cavity. In other embodiments, the internal cavity can be set to other shapes. At the same time, the cylindrical shape of the filter screen 2 in this embodiment can reduce the difficulty of fitting with the cleaning brush and improve the cleaning effect, but in other embodiments, it can also be set to a conical or truncated conical shape, etc. It should also be noted that when the filter screen 2 is cylindrical, in this embodiment the first cavity 111 is inside the filter screen 2 and the second cavity 112 is outside the filter screen 2. However, in other embodiments, the first cavity 11 can be outside the filter screen 2 and the second cavity 112 can be inside the filter screen 2. For example, when the filter screen 2 is a non-rotational body, the first cavity 111 and the second cavity 112 are arranged opposite to each other on both sides of the filter screen 2.

[0035] The mounting bracket 3 is rotatably mounted inside the inner cavity 11. The mounting bracket 3 is equipped with a cleaning brush 4 located in the second cavity 112. When the mounting bracket 3 rotates, the brush surface of the cleaning brush 4 can contact the filter surface of the filter screen 2 to clean its surface. The impeller 5 is securely connected to the mounting bracket 3 by bolts. The blades are designed to be arc-shaped, with the concave surface facing the rear of the rotation direction.

[0036] During operation, the filter medium flows into the second chamber 112 from the medium inlet 13, impacting the impeller 5 and causing it to rotate, which in turn drives the cleaning brush 4 to continuously clean the filter surface of the filter screen 2. The filter medium passes through the filter screen 2 and enters the first chamber 111, and the filtered clean medium is output through the medium outlet 12. The impurities scraped off by the cleaning brush 4 are deposited at the bottom of the second chamber 112 under gravity and can be discharged by periodically opening the drain channel 14.

[0037] In this embodiment, the cleaning brush 4 is driven by the mounting bracket 3 to clean the filter screen 2. During the cleaning process, the filter screen 2 remains stationary, which greatly avoids the filter screen 2 causing radial shearing to the flowing medium, thereby improving filtration efficiency and filtration stability.

[0038] Example 2: like Figure 1 , Figure 2 and Figure 3As shown, this embodiment adds compressed air assistance based on Embodiment 1. An air inlet channel 15 is provided on the side wall of the housing 1 corresponding to the outer periphery of the impeller 5. The air inlet channel 15 is connected to a compressed air source via a solenoid valve. When insufficient medium pressure is detected, the control system automatically opens the solenoid valve, and compressed air impacts the blades of the impeller 5 tangentially, maintaining its normal rotation speed and ensuring stable cleaning effect. If necessary, cleaning agent can be mixed into the compressed air to improve the cleaning effect. It should be noted that in other embodiments, the medium inlet 13 can be closed, and the air inlet channel 15 alone can be used to provide airflow to drive the impeller 5 to rotate, thereby completing the cleaning of the filter screen 2. In another embodiment, both the medium inlet 13 and the medium outlet 12 can be closed simultaneously, and the drain channel 14 can be opened. The air inlet channel 15 alone can be used to provide airflow to drive the impeller 5 to rotate, thereby completing the cleaning of the filter screen 2, and the drain channel 14 can be used to discharge the cleaned impurities. This embodiment, by setting the air inlet channel 15, allows the filter to self-clean the filter screen even without medium flow, increasing the application scenarios of the self-cleaning filter.

[0039] Example 3: like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment optimizes the connection structure between the mounting bracket 3 and the filter screen 2. The upper and lower ends of the filter screen 2 are respectively provided with annularly distributed guide components. Each guide component includes multiple guide posts 31 evenly arranged along the outer periphery of the filter screen 2. The ends of the guide posts 31 are rotatably connected to the mounting bracket 3, and the outer periphery of the guide posts 31 is rollably connected to the filter screen 2, thus preventing deformation of the filter screen 2 and reducing frictional resistance at the connection. It should be noted that in other embodiments, the guide posts 31 can also be arranged along the inner periphery of the filter screen 2. The guide components provided in this embodiment can prevent deformation of the filter screen 2 during cleaning and also reduce the movement resistance of the filter screen 2 to the mounting bracket 3.

[0040] Example 4: like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment improves the structure of the cleaning brush 4. The cleaning brush 4 is a cylindrical roller brush with a stainless steel core shaft coated with polyurethane material, connected to the mounting frame 3 via ball bearings. The surface of the cylindrical roller brush is provided with bristles, which improves cleaning uniformity and reduces axial force, thus extending the service life of the filter screen 2. It should be noted that in other embodiments, the cleaning brush 4 can also be configured as a shaped brush spirally coiled around the outer circumference of the filter screen 2 or a bristle brush fixedly connected to the mounting frame 3. The cleaning brush 4 structure disclosed in this embodiment can further improve the cleaning effect on the filter screen.

[0041] Example 5: like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment optimizes the rotary support structure. A support tube 6 is also provided inside the inner cavity 11. The upper end of the support tube 6 is fixedly connected to the top of the housing 1 and communicates with the medium outlet 12. The support tube 6 has an opening communicating with the first cavity 111. A connecting rod 7 is coaxially provided at the bottom of the support tube 6, and the lower end of the connecting rod 7 is connected to the filter screen 2. The upper end of the mounting bracket 3 forms a rotary joint with the outer periphery of the support tube 6 through a bushing, and the lower end of the mounting bracket 3 forms a rotary joint with the connecting rod 7 through a bushing. It should be noted that in this embodiment, the lower extension end of the connecting rod 7 is provided with an hourglass-shaped rotating body structure 71. The bushing of the mounting bracket 3 and the narrower diameter portion of the rotating body structure 71 form a rotary joint to curb the axial movement of the mounting bracket 3. In another embodiment, an axial limiting mechanism can also be fitted onto the connecting rod 7. The axial limiting mechanism is located on the upper and lower sides of the bushing to curb the axial movement of the mounting bracket 3, such as a limiting bearing. In this embodiment, the support tube 6 and the connecting rod 7 are used as the rotation axis of the mounting frame 3, which makes the rotation of the mounting frame 3 more stable. At the same time, the axial limiting mechanism is used to curb the axial movement of the mounting frame 3.

[0042] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-cleaning filter, comprising a housing (1), wherein the housing (1) has an inner cavity (11), characterized in that: The inner cavity (11) is provided with a filter screen (2), and a rotatable mounting bracket (3) is provided on one side of the filter surface of the filter screen (2). A cleaning brush (4) is provided on the mounting bracket (3) during its rotation and an impeller (5) is provided on the mounting bracket (3) that can be driven to rotate under the impact of the medium flow.

2. A self-cleaning filter according to claim 1, characterized in that: The filter screen (2) is any one of a cylinder, a cone, and a truncated cone.

3. A self-cleaning filter according to claim 2, wherein: The filter screen (2) is provided with a ring-shaped guide component at both the upper and lower ends. The guide component includes a plurality of guide posts (31) evenly arranged along the circumference of the filter screen (2). The ends of the guide posts (31) are rotatably connected to the mounting frame (3), and the outer periphery of the guide posts (31) is rolledly connected to the surface of the filter screen (2).

4. A self-cleaning filter according to claim 1, characterized in that: The filter (2) divides the inner cavity (11) into a first cavity (111) and a second cavity (112). The first cavity (111) is connected to the outside of the shell (1) through a medium outlet (12), and the second cavity (112) is connected to the outside of the shell (1) through a medium inlet (13). The bottom of the second cavity (112) is provided with a sewage discharge channel (14) connected to the outside of the shell (1).

5. A self-cleaning filter according to claim 4, characterized in that: The blades of the impeller (5) are located between the second cavity (112) and the medium inlet (13).

6. A self-cleaning filter according to claim 1, characterized in that: The housing (1) and the blades of the impeller (5) are provided with air intake channels (15).

7. A self-cleaning filter according to claim 6, characterized in that: The blades of the impeller (5) are arc-shaped blades, and the concave surface of the arc-shaped blades is arranged facing the rear side of the impeller (5) in the direction of rotation.

8. A self-cleaning filter according to claim 4, characterized in that: The inner cavity (11) is also provided with a support tube (6). The upper end of the support tube (6) is fixedly connected to the top of the shell (1) and communicates with the medium outlet (12). The support tube (6) is provided with an opening that communicates with the first cavity (111). The bottom of the support tube (6) is coaxially provided with a connecting rod (7). The lower end of the connecting rod (7) is connected to the filter screen (2). The upper end of the mounting bracket (3) forms a rotating pair with the outer periphery of the support tube (6) through a bushing. The lower end of the mounting bracket (3) forms a rotating pair with the connecting rod (7) through a bushing.

9. A self-cleaning filter according to claim 8, characterized in that: An axial limiting mechanism is fitted on the connecting rod (7), and the axial limiting mechanism is located on the upper and lower sides of the bushing.

10. A self-cleaning filter according to claim 8, characterized in that: The connecting rod (7) is provided with an hourglass-shaped rotating body structure (71), and the lower end of the mounting bracket (3) forms a rotating pair with the rotating body structure (71) through a bushing.

Images