A prefilter

Abstract

The application relates to the filter field, in particular to a primary filter which comprises a plate frame, filter material and a protective net, the primary filter has a windward surface and a leeward surface, the protective net is installed on the windward surface of the plate frame, the filter material is installed in the plate frame, the plate frame comprises an outer frame body and an inner frame body, the plate frame is fixed at a mounting position through the outer frame body, the inner frame body is detachably connected with the outer frame body, a press-fitting structure is arranged on the inner side wall of the inner frame body, and the side edges of the filter material are fixed in the inner frame body through the press-fitting structure. According to the application, the plate frame is divided into the detachably connected outer frame body and inner frame body, and the protective net and the filter material are both installed on the inner frame body, when the filter material and the protective net need to be replaced or inclined, the inner frame body can be only detached from the outer frame body, the outer frame body can keep good sealing effect between the outer frame body and the mounting surface due to the fact that the outer frame body is always fixed at the mounting position, and the unfiltered air is prevented from leaking from the plate frame and the mounting surface.

Description

Technical Field

[0001] This application relates to the technical field of filters, and more particularly to a pre-filter. Background Technology

[0002] A pre-filter is a primary filtration device in an air conditioning system used to filter dust particles larger than 5μm. It comes in three styles: panel, pleated, and bag. The outer frame material includes paper, aluminum, and galvanized iron. Filter media include non-woven fabric, nylon mesh, metal mesh, and activated carbon. The protective mesh is configured with double-sided powder coating and galvanized iron wire mesh.

[0003] In related technologies, pre-filters mainly consist of three parts: a frame, filter media, and a protective mesh. The protective mesh is installed on the windward side of the pre-filter to prevent the filter media from deforming or breaking under wind pressure. The protective mesh has a porous structure to facilitate airflow. The filter media and frame are fixed inside the frame. A problem with this technology is that because the filter media is directly fixed inside the frame, the entire filter needs to be removed from its installation position when the filter media needs to be replaced or cleaned. During this process, the frame and the inner wall of the installation position are prone to wear, which may create gaps, allowing unfiltered air to leak out.

[0004] In addition, after long-term use, large-particle dust and impurities are easily attached to the surface of the protective net, which requires regular cleaning. Furthermore, the protective net in the relevant technology is not easy to disassemble. Utility Model Content

[0005] To facilitate the disassembly of the filter media and protective screen, this application provides a pre-filter.

[0006] The primary filter provided in this application adopts the following technical solution:

[0007] A pre-filter includes a plate and frame, filter media, and a protective screen. The pre-filter has a windward side and a leeward side. The protective screen is installed on the windward side of the plate and frame, and the filter media is installed inside the plate and frame. The plate and frame includes an outer frame and an inner frame. The plate and frame are fixed in the installation position by the outer frame. The inner frame is detachably connected to the outer frame. A press-fit structure is provided on the inner side wall of the inner frame, and the side of the filter media is fixed in the inner frame by the press-fit structure.

[0008] Optionally, the press-fit structure includes a fixed component and a movable component that are fitted together. The fixed component is fixed to the inner side wall of the inner frame and extends along the height direction of the inner frame. At least two movable components are provided, and the at least two movable components are evenly distributed in the extension direction of the fixed component. A press-fit groove is formed between the fixed component and the movable component. The side of the filter material extends into the press-fit groove and is pressed and fixed by the interaction between the fixed component and the movable component.

[0009] Optionally, the pressing groove is L-shaped, and the surfaces of the fixed part and the movable part constituting the pressing groove are respectively provided with toothed grooves and toothed racks. The toothed grooves and toothed racks cooperate with each other to increase the friction between the fixed part, the movable part and the filter material. The movable part can move closer to or away from the fixed part along the length direction of the inner frame.

[0010] Optionally, the fastener includes at least two spaced-apart side plates, each side plate having an integrally formed connecting portion and a first extension portion. One end of the connecting portion is fixed to the inner sidewall of the inner frame, and the other end is connected to the first extension portion. The first extension portion is inclined toward the inner sidewall of the inner frame and the angle between it and the connecting portion is less than 90°.

[0011] Optionally, the movable part includes a main body and a second extension. The main body is perpendicular to the connecting part, and the first extension is formed on the side of the main body facing the fixing part and parallel to the second extension. The movable part can be fastened to the fixing part.

[0012] Optionally, the connection between the connecting part and the first extension, as well as the connection between the main body and the second extension, are both configured as arc-shaped structures.

[0013] Optionally, a ring plate is formed on the side of the inner frame away from the protective net. The ring plate cooperates with the end face of the outer frame. Insertion holes are provided on both the ring plate and the outer frame, and a first connector is inserted into the insertion hole.

[0014] Optionally, a groove is provided on the end face of the outer frame facing the inner frame, and a spring strip is installed in the groove, with the inner frame installed inside the outer frame abutting against the spring strip.

[0015] Optionally, each of the four corners of the inner frame has a mounting portion, which extends along the width of the inner frame and abuts against the protective net. Both the mounting portion and the protective net have connecting holes, and a second connector is inserted into the connecting hole.

[0016] Optionally, the inner frame may also be provided with a skeleton, which provides support for the filter material and enables the filter material to form a folded structure.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. By dividing the plate frame into a detachable outer frame and an inner frame, and installing the protective mesh and filter media on the inner frame, when it is necessary to replace or tilt the filter media or protective mesh, simply remove the inner frame from the outer frame. Since the outer frame is always fixed in the installation position, a good sealing effect can be maintained between the outer frame and the installation surface, preventing unfiltered air from leaking between the plate frame and the installation surface.

[0019] 2. The filter media is press-fitted and fixed by the cooperation of the fixed and movable parts. The interlocking fixed and movable parts are easy to disassemble, thus making it easy to remove the filter media. In addition, by setting racks and grooves on the mating surfaces of the fixed and movable parts, the friction between the filter media, fixed parts and movable parts can be increased, thereby improving the press-fitting effect of the filter media. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall exploded structure of an embodiment of this application.

[0021] Figure 2 This is a top cross-sectional structural diagram of an embodiment of this application.

[0022] Figure 3 This is a schematic diagram of the structure of the inner frame in an embodiment of this application.

[0023] Figure 4 This is a partial structural schematic diagram of the press-fit structure in an embodiment of this application.

[0024] Reference numerals: 1. Plate frame; 11. Outer frame; 12. Inner frame; 13. Ring plate; 14. First connector; 2. Filter media; 3. Protective net; 4. Press-fit structure; 41. Fixing member; 411. Connecting part; 412. First extension part; 42. Movable part; 421. Main body part; 422. Second extension part; 43. Rack; 5. Spring rack; 6. Mounting part; 7. Second connector; 8. Frame. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0026] This application discloses a primary filter. (Refer to...) Figure 1 The pre-filter has a rectangular plate structure with a windward and leeward side. Unfiltered air enters the pre-filter from the windward side and exits from the leeward side after filtration. The pre-filter specifically includes a plate frame 1, filter media 2, and a protective mesh 3. The plate frame 1 is a square frame, and the filter media 2 and protective mesh 3 are installed inside the plate frame 1. The protective mesh 3 is specifically installed at the opening on the windward side of the plate frame 1 to prevent the filter media 2 from deforming or being damaged under wind pressure.

[0027] Furthermore, the frame 1 includes an outer frame 11 and an inner frame 12. The filter media 2 and the protective mesh 3 mentioned above are both installed inside the inner frame 12, and the inner frame 12 is detachably connected to the outer frame 11. With this structure, the inner frame 12 can be separated from the outer frame 11, and the filter media 2 and the protective mesh 3 installed inside the inner frame 12 can be removed, facilitating subsequent replacement or cleaning.

[0028] Specifically, the inner frame 12 and the outer frame 11 can be connected by the following structure: a ring plate 13 is formed at the leeward end of the inner frame 12, and the ring plate 13 matches the end face size of the outer frame 11. When the inner frame 12 and the outer frame 11 are connected, the ring plate 13 is tightly attached to the end face of the outer frame 11. Furthermore, corresponding insertion holes are provided on the end faces of the ring plate 13 and the outer frame 11. First connecting members 14 are inserted into the insertion holes to connect the inner frame 12 and the outer frame 11. The insertion holes and the first connecting members 14 can be mutually mating pin holes or pin shafts, or other detachable connection structures, which are not limited here. Preferably, four insertion holes are provided on the end faces of the ring plate 13 and the outer frame 11, and the four insertion holes are located at the four corners of the ring plate 13. By providing first connecting members 14 in each insertion hole, the connection between the inner frame 12 and the outer frame 11 is more stable.

[0029] Reference Figure 1 A groove is provided on the end face of the outer frame 11 facing the ring plate 13, and a spring strip 5 is installed in the groove. The spring strip 5 is designed to extend and retract in a direction perpendicular to the end face. When the outer frame 11 and the inner frame 12 are connected, the spring strip 5 is compressed; when the outer frame 11 and the inner frame 12 are disconnected, the spring strip 5 restores its deformation and applies an external force to the ring plate 13 away from the outer frame 11, causing the inner frame 12 to pop out from the outer frame 11 for easy retrieval by staff. The specific design of the spring strip 5 is common knowledge and will not be elaborated here. It should be noted that, to ensure greater stability of the inner frame 12 when it pops out, there can be two spring strips 5, with the two spring strips 5 corresponding to the two opposite sides of the ring plate 13; or there can be four spring strips 5, with the four spring strips 5 corresponding to the four sides of the ring plate 13.

[0030] Reference Figure 2 A frame 8 is provided inside the inner frame 12. In some preferred embodiments of this application, the frame 8 consists of multiple rods extending along the height direction of the inner frame 12. When installing the filter media 2, the filter media 2 is passed through each rod in sequence, and the rods provide support for the filter media 2 and form a folded structure. Press-fitting structures 4 are respectively provided on the two inner side walls of the inner frame 12. The press-fitting structures 4 are used to press and fix the two sides of the filter media 2, thereby realizing the installation of the filter media 2. By setting the filter media 2 into a folded structure, the contact area between the airflow and the filter media 2 can be increased, improving the filtration efficiency.

[0031] Furthermore, the press-fit structure 4 includes a fixed part 41 and a movable part 42 that are fitted together. The fixed part 41 is fixed to the inner side wall of the inner frame 12 by welding or bonding. The movable part 42 can be connected to the fixed part 41 by fastening. When the fixed part 41 and the movable part 42 are fastened together, an L-shaped press-fit groove is formed between the fixed part 41 and the movable part 42. The side of the filter material 2 extends into the press-fit groove and is pressed and fixed by the interaction of the fixed part 41 and the movable part 42.

[0032] Specifically, the fixing member 41 extends along the height direction of the inner frame 12, and at least two movable members 42 are provided and evenly distributed along the height direction of the fixing member 41, so that the compressive force on the filter material 2 is more uniform and the filter material 2 is prevented from deforming.

[0033] Furthermore, the fastener 41 includes at least two spaced-apart side plates, each side plate having an integrally formed connecting portion 411 and a first extension portion 412, wherein one end of the connecting portion 411 is welded or bonded to the inner sidewall of the inner frame 12, and the other end extends horizontally toward the middle of the inner frame 12, and the first extension portion 412 is formed at the end of the connecting portion 411 and inclined toward the inner sidewall of the inner frame 12, such that the angle between the connecting portion 411 and the first extension portion 412 is less than 90°.

[0034] Correspondingly, the movable component 42 consists of a main body 421 and a second extension 422. The plane of the second extension 422 forms a certain angle with the main body 421. This angle is the same as the angle between the connecting part 411 and the first extension 412, making the first extension 412 and the second extension 422 parallel. When the movable component 42 is fastened to the fixed component 41, the first extension 412 and the second extension 422 are in full contact, while the main body 421 is perpendicular to the connecting part 411. Preferably, the joints between the connecting part 411 and the first extension 412, and the joints between the main body 421 and the second extension 422, are all designed with arc-shaped structures, so that the filter material 2 at the joints is subjected to more uniform force.

[0035] Furthermore, toothed grooves and racks 43 are respectively provided on the side of the fixed part 41 and the movable part 42 facing the pressing groove. When the movable part 42 is fastened on the fixed part 41, the racks 43 and the toothed grooves cooperate with each other, thereby increasing the friction between the fixed part 41, the movable part 42 and the filter material 2.

[0036] Reference Figure 1 and Figure 3At each of the four corners of the inner frame 12, there is a mounting part 6. Each mounting part 6 is a cylindrical structure integrally formed with the inner frame 12, and the axis of each mounting part 6 is parallel to the width direction of the inner frame 12. A protective net 3 is installed at the windward end of the inner frame 12. Corresponding connecting holes are provided on the protective net 3 and the mounting parts 6. The protective net 3 can be connected to the inner frame 12 by inserting a second connecting piece 7 into the connecting hole. The connecting hole and the second connecting piece 7 can be threaded holes and screws, or other detachable connection structures.

[0037] This application provides a primary filter, which divides the plate frame 1 into a detachably connected outer frame 11 and an inner frame 12, and installs the protective mesh 3 and filter media 2 on the inner frame 12. When it is necessary to replace or tilt the filter media 2 and the protective mesh 3, the inner frame 12 can be removed from the outer frame 11. Since the outer frame 11 is always fixed in the installation position, a good sealing effect can be maintained between the outer frame 11 and the installation surface, preventing unfiltered air from leaking between the plate frame 1 and the installation surface.

[0038] The filter media 2 is press-fitted and fixed with the cooperation of the fixed part 41 and the movable part 42. The interlocking fixed part 41 and the movable part 42 are easy to disassemble, thus making it easy to remove the filter media 2. In addition, by setting the toothed surface 43 and toothed groove on the mating surface of the fixed part 41 and the movable part 42, the friction between the filter media 2, the fixed part 41 and the movable part 42 can be increased, thereby improving the press-fitting effect of the filter media 2.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A primary filter, comprising a plate and frame (1), filter media (2), and a protective mesh (3), the primary filter having a windward side and a leeward side, the protective mesh (3) being installed on the windward side of the plate and frame (1), and the filter media (2) being installed inside the plate and frame (1), characterized in that: The plate frame (1) includes an outer frame (11) and an inner frame (12). The plate frame (1) is fixed in the installation position by the outer frame (11). The inner frame (12) is detachably connected to the outer frame (11). A press-fit structure (4) is provided on the inner side wall of the inner frame (12). The side of the filter material (2) is fixed in the inner frame (12) by the press-fit structure (4).

2. The primary filter according to claim 1, characterized in that: The press-fit structure (4) includes a fixed part (41) and a movable part (42) that are fitted together. The fixed part (41) is fixed on the inner side wall of the inner frame (12) and extends along the height direction of the inner frame (12). There are at least two movable parts (42), which are evenly distributed in the extension direction of the fixed part (41). A press-fit groove is formed between the fixed part (41) and the movable part (42). The side of the filter material (2) extends into the press-fit groove and is pressed and fixed under the interaction of the fixed part (41) and the movable part (42).

3. The primary filter according to claim 2, characterized in that: The pressing groove is L-shaped. The surfaces of the fixed part (41) and the movable part (42) constituting the pressing groove are respectively provided with toothed grooves and toothed racks (43). The toothed grooves and toothed racks (43) cooperate with each other to increase the friction between the fixed part (41), the movable part (42) and the filter material (2). The movable part (42) can move closer to or away from the fixed part (41) along the length direction of the inner frame (12).

4. The primary filter according to claim 2 or 3, characterized in that: The fastener (41) includes at least two spaced side plates, each side plate having an integrally formed connecting part (411) and a first extension part (412). One end of the connecting part (411) is fixed to the inner side wall of the inner frame (12), and the other end is connected to the first extension part (412). The first extension part (412) is inclined toward the inner side wall of the inner frame (12) and the angle between it and the connecting part (411) is less than 90°.

5. The primary filter according to claim 4, characterized in that: The movable part (42) includes a main body (421) and a second extension (422). The second extension (422) is formed on the side of the main body (421) facing the fixing member (41) and is parallel to the second extension (422). The movable part (42) can be fastened to the fixing member (41).

6. The primary filter according to claim 5, characterized in that: The connection between the connecting part (411) and the first extension part (412), and the connection between the main body part (421) and the second extension part (422) are all designed with an arc-shaped structure.

7. The primary filter according to claim 1, characterized in that: The inner frame (12) has a ring plate (13) on the side away from the protective net (3). The ring plate (13) is matched with the end face of the outer frame (11). Insertion holes are provided on both the ring plate (13) and the outer frame (11). A first connector (14) is inserted into the insertion hole.

8. The primary filter according to claim 1, characterized in that: The outer frame (11) has a groove on the end face facing the inner frame (12), and a spring strip (5) is installed in the groove. The inner frame (12) installed in the outer frame (11) abuts against the spring strip (5).

9. The primary filter according to claim 1, characterized in that: The four corners of the inner frame (12) are each provided with a mounting part (6). The mounting part (6) extends along the width direction of the inner frame (12) and abuts against the protective net (3). Both the mounting part (6) and the protective net (3) are provided with connecting holes, and a second connector (7) is inserted into the connecting hole.

10. The primary filter according to claim 1, characterized in that: The inner frame (12) is also provided with a skeleton (8), which provides support for the filter material (2) and makes the filter material (2) form a folded structure.

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