Combined frame and electrostatic air filter

Abstract

The invention relates to a combined frame and an electrostatic air filter, and belongs to the technical field of air purification equipment.The combined frame comprises splicing pieces and frame sectional materials, the multiple frame sectional materials are connected end to end to form a frame body, the adjacent frame sectional materials are connected through the splicing pieces, cavity channels are formed in the frame sectional materials, and the cavity channels are communicated with the splicing pieces. According to the invention, the technical problems that in the prior art, standardized production is difficult to realize, and the die development and overall manufacturing cost is increased can be solved.

Description

Technical Field

[0001] This invention belongs to the field of air purification equipment technology, specifically relating to a combination frame and an electrostatic air filter. Background Technology

[0002] Currently, air purification technologies on the market can be mainly divided into two categories: media filtration technology and electrostatic adsorption technology. Among them, electrostatic adsorption technology, with its unique technological advantages, is gradually expanding into a wider range of application areas. Electrostatic adsorption technology achieves purification through two key steps: first, an ionization module charges pollutants such as particulate matter in the air; then, an electric field is formed through a dust collection module, using the electric field force to adsorb and capture the charged pollutants. This technology has advantages such as low energy consumption, reusability, and no need for frequent filter replacement.

[0003] Media filtration technology has a long history of development and widespread market application. Air conditioning systems in both new and existing buildings, especially modular air conditioning units, have mounting frames that accommodate existing media filters, which come in various sizes. Electrostatic adsorption technology, due to its different operating principles, requires designs to use media filters of the same dimensions to ensure compatibility with existing air conditioning systems in both new and existing buildings. This diversity in specifications and models hinders the standardization and efficiency of production. Different specifications often require separate molds, increasing mold development costs and limiting the cost advantages of large-scale mass production, thus driving up overall manufacturing costs. Summary of the Invention

[0004] In view of the shortcomings of existing technologies, a combination frame and an electrostatic air filter are proposed to solve the technical problems of difficulty in achieving standardized production, increased mold development and overall manufacturing costs in existing technologies.

[0005] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a composite frame, including splicing components and frame profiles, wherein multiple frame profiles are joined end to end to form a frame, and adjacent frame profiles are connected by the splicing components. The frame profiles are provided with cavities, and the splicing components are provided with plugs adapted to the cavities.

[0006] The technical solution is further configured such that the cavity is located on the inner wall of the frame profile, and the inner wall is the opposite side of the frame profile.

[0007] The technical solution is further configured such that the splicing component has a bent portion, the surface of the bent portion is provided with a partition plate corresponding to the cavity, and the end face of the bent portion is provided with multiple plug-in groups facing different directions. Each plug-in group consists of multiple plugs, and the plug-in groups facing different directions are respectively plugged into different frame profiles.

[0008] The technical solution is further configured such that the cross-section of the connector is flat, block-shaped, or columnar.

[0009] The technical solution is further configured such that the end of the connector is provided with a thinning part, which is formed by removing part of the material or by producing it by a mold.

[0010] The technical solution is further configured such that the cavity is configured as an open end face and at least one semi-closed structure with a confined cavity face, the cavity face being parallel to the inner wall of the frame profile.

[0011] The technical solution is further configured to include an inspection cover, which is snapped together with one of the frame profiles to form a power supply compartment for placing the power supply, and the splicing piece that is inserted into the frame profile is provided with a wiring channel.

[0012] The technical solution is further configured such that the inspection cover is provided with a claw, the outer wall of the frame profile is recessed towards its inner wall to form a groove that matches the claw, and the outer wall of the frame profile is provided with a guide surface to guide the claw into the groove.

[0013] The technical solution is further configured such that the splicing component has a notch recessed towards the power compartment, the splicing component is provided with a lead wire interface and a communication interface respectively communicating with the power compartment and the notch, and a wind baffle is provided at the notch.

[0014] The technical solution is further configured such that the windward side dimension of the frame is equal to its air outlet side dimension.

[0015] The technical solution is further configured such that the windward side dimension of the frame is larger than its air outlet side dimension.

[0016] The technical solution is further configured such that the frame is provided with drainage holes, and a portion of the frame protrudes from its surface to form a protrusion.

[0017] The technical solution is further configured such that the frame is provided with a splicing structure, which is used to connect adjacent frames.

[0018] The technical solution is further configured such that a positioning hole is provided on the frame, and a magnetic suction element is provided at the positioning hole.

[0019] In a second aspect, the present invention provides an electrostatic air filter, comprising the aforementioned combination frame.

[0020] The beneficial effects of this invention are: By using frame profiles and splicing parts, the frame size that meets the on-site installation space requirements can be quickly assembled, improving the product's adaptability and ease of installation, expanding application scenarios, and greatly reducing mold development and overall manufacturing costs; the plug-in connectors and cavity plug-in connections effectively prevent the frame from deforming or loosening during long-term use. Attached Figure Description

[0021] Figure 1 This is an axonometric view of one embodiment of the combo box in this invention. Figure 2 for Figure 1 Exploded view; Figure 3 for Figure 1 Assembly view of the inspection cover and frame profile in the middle; Figure 4 for Figure 1 Assembly view of the inspection cover and frame profile in the middle; Figure 5 for Figure 4 Partial schematic diagram at point A in the middle; Figure 6 This is a schematic diagram of one embodiment of the splicing component in this invention; Figure 7 This is a schematic diagram of another embodiment of the splicing component in this invention; Figure 8 This is a schematic diagram of one embodiment of the lower splicing component in this invention; Figure 9 This is a schematic diagram of another embodiment of the lower splicing component in this invention; Figure 10 This is an axonometric view of another embodiment of the combo box in this invention; Figure 11 for Figure 10 Exploded view; Figure 12 for Figure 10 Assembly view of the inspection cover and frame profile in the middle; Figure 13 This is a schematic diagram of another embodiment of the splicing component in this invention; Figure 14 This is a schematic diagram of another embodiment of the splicing component in this invention; Figure 15 This is a schematic diagram of another embodiment of the lower splicing component in this invention; Figure 16 This is a schematic diagram of another embodiment of the lower splicing component in this invention; Figure 17 for Figure 2 Partial schematic diagram at point B in the middle; Figure 18 for Figure 11 A partial schematic diagram at point C.

[0022] In the attached diagram: 100, frame profile; 101, guide surface; 102, first cavity; 103, second cavity; 104, third cavity; 200, splicing component; 210, upper splicing component; 220, lower splicing component; 300, inspection cover; 301, claw; 302, limiting block; 303, fourth cavity; 304, second connecting hole; 305, fifth cavity; 400, power supply compartment; 500, connector; 510, horizontal connector; 520, vertical connector; 530, lateral connector; 600, lead wire interface; 700, communication interface; 800, wind baffle; 900, splicing hole; 110, mounting hole; 120, protrusion; 130, drainage hole; 140, partition; 150, first connecting hole; 160, positioning hole; 170, wiring channel. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings; therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0024] Example 1: According to an embodiment of the present invention, a combo box is provided; please refer to [link / reference]. Figures 1 to 2 The core concept of the modular frame lies in its modular and connectable design. It mainly consists of two basic components: frame profiles 100 and connectors 200. By connecting multiple frame profiles 100 end to end and using connectors 200 to connect them at the corners, a frame of the required size, such as a rectangular frame, can be quickly assembled.

[0025] Optionally, the frame profile 100 is integrally extruded from engineering plastic to ensure strength while achieving lightweight design. The frame profile 100 has multiple internal cavities (such as a first cavity 102, a second cavity 103, and a third cavity 104). The splicing component 200 is typically an injection-molded plastic part with connectors 500 precisely fitted to the cavities. This "standard profile + dedicated connector" approach allows for unlimited scalability of the frame specifications.

[0026] By adopting the above technical solution, the problems of numerous specifications and high mold costs mentioned in the background technology are fundamentally solved. Manufacturers only need to produce a few standard lengths of frame profiles 100 and a few standard corner splicing parts 200, and can assemble frames of various sizes in a way similar to building blocks, which greatly reduces mold investment and inventory management costs, and achieves the unity of standardization and customization.

[0027] It should be noted that electrostatic air filters comprise multiple functional modules, such as ionization modules, dust collection modules, and pre-filter modules. Each module, as an independent unit, has its own dedicated frame (referred to as the first frame), which is then installed into the frame component (the second frame). This results in multiple layers of frames, both internal and external. Furthermore, the wide variety of media filtration specifications makes it difficult for electrostatic air filters to be effectively adapted to existing standardized installation frames. This compatibility issue forces manufacturers to develop separate molds for different frame specifications, significantly increasing mold investment and unit production costs, as well as adding complexity and cost to on-site installation, ultimately hindering the large-scale market application of this technology.

[0028] To address the aforementioned drawbacks and solve the problem of numerous and varied frames and specifications in electrostatic air filter products, a design using frame profiles 100 and splicing components 200 allows for the assembly of electrostatic air filters of different sizes by employing frame profiles 100 of varying lengths, thus better adapting to on-site installation space. The frame profiles 100 and their corresponding positions within the multiple cavities provide mounting slots for various functional modules of the electrostatic air filter (such as ionization modules, dust collection modules, and pre-filter modules). These functional modules are integrated into a single frame, replacing the traditional multi-shell assembly method, reducing overall thickness and lowering costs. In terms of application, the thinner profile significantly improves the filter's spatial adaptability, enabling installation in narrow spaces with strictly limited width. Furthermore, this design maximizes the effective planar area of ​​each functional module, thereby balancing and improving air purification efficiency and dust holding capacity.

[0029] Furthermore, based on the existing mounting frame structure of media filters, electrostatic air filters can be installed in two ways: side-mounted (the electrostatic air filter is pushed in from the side of the mounting frame) and front-mounted (the electrostatic air filter is pushed in from the front of the mounting frame). Please refer to [link / reference]. Figure 1 and Figure 2 To accommodate side mounting, the frame can adopt a panel structure, meaning its front (windward side) and rear (air outlet side) dimensions are identical, forming a regular panel shape. Specifically, the outer surface of the frame profile 100 has a flat, planar structure. To accommodate front mounting, the frame can adopt a panel structure or a pocket structure. Please refer to [link / reference]. Figure 10 and Figure 11The bag-type structure means that the front side (windward side) of the frame is larger than its rear side (outward side). Specifically, the outer surface of the frame profile 100 adopts a non-flat stepped structure, achieved by designing the portion of the frame profile 100 near the windward side as a stepped structure extending outwards from the frame. This design effectively expands the internal space for the purification module without increasing the frame depth, making it particularly suitable for applications with higher dust holding capacity requirements.

[0030] In the combo box of this embodiment, please refer to Figure 4 , Figure 17 as well as Figure 18 The cavities (e.g., the first cavity 102 and the second cavity 103) are precisely disposed on the inner wall of the frame profile 100. Here, "inner wall" specifically refers to the two opposite sides inside the frame after the frame is assembled.

[0031] By adopting the above technical solution, the cavities are concentrated on the inner wall, while the outer side of the cavities provides dedicated and regular mounting slots for the functional modules, ensuring the installation accuracy and consistency of all modules within the frame. Simultaneously, the smooth and flat outer wall of the frame profile 100mm is maintained, facilitating the installation of the overall filter.

[0032] Specifically, the cavities adopt a semi-enclosed structure. For example, the end face of the first cavity 102 along the length of the profile is open to allow the insertion of the connector 500. One cavity surface is confined and closed, while the other cavity surface is open. The cavity surface is parallel to the inner wall of the frame profile 100, facilitating adhesive application and wiring, while also saving material. The end face of the second cavity 103 along the length of the profile is open, similarly facilitating the insertion of the connector 500. Both of its cavity surfaces are confined and closed. This structure provides the necessary channels and space for connection while maintaining sufficient structural strength to withstand the pressure from insertion and vibration during long-term use. The open end faces facilitate assembly, while the confined cavity surfaces ensure the overall rigidity of the profile.

[0033] In the combo box of this embodiment, please refer to Figures 1 to 2 , Figures 6 to 9 , Figures 13 to 16 The splicing component 200 (which can be divided into an upper splicing component 210 located above the frame and a lower splicing component 220 located below the frame) is designed with a bent portion, usually at a 90-degree right angle to accommodate rectangular frames. For frames with non-right-angle connections, the bending angle of the bent portion can be adjusted to an acute or obtuse angle accordingly. Additionally, the outer surface of the splicing component 200 can use curved lines.

[0034] Specifically, the two upper splicing components 210 are symmetrically arranged, and their structures are largely the same. The only difference is that one upper splicing component 210 has a mounting hole 110 for installing connectors (such as studs), while the other upper splicing component 210 has a splicing hole 900 for attaching connectors exposed outside the mounting hole 110, thus enabling the splicing of two adjacent frame sections. In other words, the mounting hole 110, connectors, and splicing hole 900 constitute the splicing structure, which can also be set on the opposite frame profile 100. Similarly, the two lower splicing components 220 are symmetrically arranged, and their structures are largely the same. The only difference is that one lower splicing component 220 has a mounting hole 110, while the other lower splicing component 220 has a splicing hole 900. The two frame sections are spliced ​​through the mounting hole 110, connectors, and splicing hole 900.

[0035] Specifically, the splicing component 200 is provided with a positioning hole 160, and a magnetic attracting component (such as a magnet) is provided at the positioning hole 160. This magnetic attracting component is used to attract the pre-filter of the electrostatic air filter. Ribs are provided on the inner wall of the positioning hole 160 to enhance the stability of the magnetic attracting component. In addition, the positioning hole 160 can also be provided on the frame profile 100.

[0036] Specifically, the lower splice 220 is provided with a protrusion 120 and a drain hole 130. The drain hole 130 is a cavity connection. The protrusion 120 protrudes 0.5-2mm from the outer surface of the lower splice 220, facilitating push-pull and installation while ensuring a seal and reducing resistance. The drain hole 130 is a through hole. After the electrostatic air purifier filter has been running for a period of time, it needs to be cleaned. Water remaining in the frame can be discharged through the drain hole 130, accelerating drying. In addition, the protrusion 120 and the drain hole 130 can also be provided on the frame profile 100 located at the bottom of the frame.

[0037] Specifically, the end face of the bent portion is provided with multiple sets of connectors facing different directions. For example, one set of transverse connectors 510 faces the X-axis direction, and another set of longitudinal connectors 520 faces the Y-axis direction. Each set of connectors consists of multiple connectors 500 (as shown in the figure, 1, 2, or 4) to provide a stable multi-point connection. This allows a splice 200 to be securely connected to two mutually perpendicular frame profiles 100 simultaneously.

[0038] Please see Figures 6 to 9 For a panel-type frame structure, multiple horizontal connectors 510 are located on the same horizontal plane, and multiple vertical connectors 520 are located on the same vertical plane. Please refer to [link / reference]. Figures 13 to 16For the bag-type frame structure, multiple horizontal connectors 510 are located on different parallel horizontal planes, and multiple vertical connectors 520 are located on different parallel vertical planes. It should be noted that the number of connectors 500 in each connector group is determined according to the number of cavities in the frame profile 100, and the size of the connectors 500 is adapted to the cross-sectional size of the cavities.

[0039] Specifically, a partition 140 is integrally formed on the inner surface of the bent portion. After the connector 500 is inserted into the cavity of the frame profile 100, the partition 140 serves to separate and position it. At the same time, a partition is also provided on the frame profile 100 to provide mounting slots for the various functional modules of the electrostatic air filter.

[0040] By adopting the above technical solution, the partition 140 enhances the torsional stiffness of the connection and prevents the frame from deforming under stress. The distribution of multiple connector groups effectively disperses the connection force, avoids stress concentration, and improves the structural stability and load-bearing capacity of the entire frame.

[0041] In the combo box of this embodiment, please refer to Figures 6 to 9 , Figures 13 to 16 The cross-sectional shape of the connector 500 is crucial to ensuring smooth insertion and connection strength, and it is preferably flat, block-shaped, or columnar.

[0042] Specifically, flat connectors 500 are suitable for scenarios requiring error-proof insertion direction, as they cannot be rotated for insertion in the wrong direction. Block-shaped (e.g., rectangular) connectors 500 provide a larger contact area, achieving a more stable, wobble-free connection. Columnar (e.g., circular or polygonal prism) connectors 500 are easy to manufacture and offer good insertion guidance. Polygonal prisms (e.g., hexagonal prisms) combine guidance and torsional resistance. By selecting different shapes, the ease of insertion, the torsional resistance after connection, and the ability to prevent mis-installation can be optimized.

[0043] Specifically, at the end of the connector 500 (i.e., the part that is first inserted into the cavity), a portion of material is removed by chamfering, beveling, or rounding, or it is produced by molding to form a thinned section. This is essentially an infeed guide structure. This thinned section effectively reduces the insertion force, and even when there are slight dimensional tolerances between the connector 500 and the cavity, it can easily guide the connector to align and insert, preventing component damage caused by forced insertion and improving assembly efficiency and yield. In addition, the thinned section can not only be located at the end of the connector, but can also be designed as a tapered wedge structure along the connector axis, which can also play a guiding and force-reducing role.

[0044] In the combo box of this embodiment, please refer to Figures 1 to 12The assembly frame also includes an inspection cover 300, which is connected to a frame profile 100 via a snap-fit ​​connection, together forming a sealed power supply compartment 400 for housing and protecting the high-voltage power module. This design is an internal power supply structure. A wiring channel 170 is provided on the splicing component that interlocks with the frame profile 100. This wiring channel 170 is formed by two interconnected wiring holes on the bent portion. The wiring channel 170 provides space for the connection lines between the high-voltage power module and the electrostatic air filter functional module, while also facilitating water leakage.

[0045] Specifically, the inspection cover 300 is provided with elastic claws 301. Correspondingly, a groove matching the claws 301 is formed by inward recessing on the outer wall of the frame profile 100. To further facilitate installation, a guide surface 101 (such as a slope) is provided at the entrance of the groove, which guides the claws 301 to smoothly slide into the groove and lock. This design enables quick tool-free opening and closing of the power compartment, greatly facilitating the installation, maintenance, or replacement of the high-voltage power module. The snap-fit ​​structure has good sealing performance, effectively preventing dust and moisture from entering the power compartment and ensuring electrical safety. The design of the guide surface 101 improves user experience and assembly efficiency.

[0046] It should be noted that, in addition to snap-fit ​​connections, the inspection cover 300 and the frame profile 100 can also be connected by a sliding rail or magnetic adsorption. Furthermore, the high-voltage power module can be externally mounted without being housed within the frame. In this configuration, the inspection cover 300 is unnecessary, and the upper splice 210 and lower splice 220 have the same structure.

[0047] Please see Figures 1 to 6 For the panel-type frame structure, the frame profile 100 connected to the inspection cover 300 has a built-in third cavity 104. Correspondingly, the upper splice 210 is provided with a lateral connector 530. To improve stability, the upper splice 210 is provided with a first connecting hole 150, and the inspection cover 300 is provided with a second connecting hole 304 corresponding to the first connecting hole 150. The first connecting hole 150 and the second connecting hole 304 are connected by a connector (such as a stud). The lateral connector 510 is embedded between the two second connecting holes 304. The top of the third cavity 104 is provided with a wing perpendicular to it. One side of the wing is provided with a guide surface 101 and a slot. The inspection cover 300 is provided with a limit block 302, which abuts against the top of the wing. The limit block 302, the claw 301, and the slot cooperate to improve the connection stability between the inspection cover 300 and the frame profile 100.

[0048] Please see Figures 10 to 12For the bag-shaped frame, the frame profile 100 connected to the inspection cover 300 also has a third cavity 104, a wing, a guide surface 101, and a slot. In addition, the outer surface of the inspection cover 300 adopts a non-flat stepped structure, with a fourth cavity 303 on its larger side. Correspondingly, a lateral connector 530 is provided on the upper splice 210. Specifically, when there are two fourth cavities 303, two lateral connectors 530 are arranged side-by-side. A fifth cavity 305 is provided on the smaller side of the inspection cover 300, and a transverse connector 510 is embedded in the fifth cavity 305.

[0049] In the combo box of this embodiment, please refer to Figure 6 , Figure 7 , Figure 13 , Figure 14 The upper splicing component 210 has a recessed notch facing the power supply compartment 400. Within this notch area, a lead wire interface 600 and a communication interface 700 are provided. The lead wire interface 600 is used to connect the high-voltage power module inside the power supply compartment 400 to an external power source, or to connect two high-voltage power modules in adjacent frames. The communication interface 700 is used to connect control signal lines. The notch provides operational space for wiring connections. Additionally, a baffle 800 is provided at the notch to block airflow, preventing unpurified airflow from directly passing through the notch and improving purification efficiency. Furthermore, an observation hole is provided within the notch area, corresponding to the indicator lights of the high-voltage power module, to observe the status of the high-voltage power module.

[0050] Specifically, the lead interface 600 and communication interface 700 can use waterproof connectors to adapt to high humidity environments. The wind deflector 800 can be integrally formed with the upper splice 210, or it can be installed as a separate part later.

[0051] Example 2: According to an embodiment of the present invention, an electrostatic air filter is provided, the core feature of which is the use of the aforementioned modular frame. This modular frame serves as the filter's skeleton, used for mounting and securing the various functional modules. Due to the use of the modular frame, the electrostatic air filter possesses advantages such as flexible specifications, standardized production, and low cost.

[0052] 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 interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, 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.

[0053] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0054] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0055] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0056] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A combination frame, characterized in that, The splicing piece and the frame profile are included, a plurality of frame profiles are connected head to tail to form a frame body, the adjacent frame profiles are connected through the splicing piece, the frame profile is provided with a cavity, and the splicing piece is provided with a plug-in head matched with the cavity.

2. A modular frame according to claim 1, wherein, The cavity is located on the inner wall of the frame profile, and the inner wall is the opposite side of the oppositely arranged frame profiles.

3. A combination frame as claimed in claim 1, wherein The splicing piece has a bending part, the surface of the bending part is provided with a partition plate corresponding to the cavity, and the end surface of the bending part is provided with a plurality of plug-in head groups facing different directions, each plug-in head group is composed of a plurality of plug-in heads, and the plug-in head groups facing different directions are respectively inserted with different frame profiles.

4. A combination frame as claimed in claim 1 or claim 3, wherein, The cross section of the plug-in head is flat, block-shaped or columnar.

5. A combination frame as claimed in claim 4, wherein, The end of the plug-in head is provided with a thinning part.

6. A combination frame as claimed in claim 1, wherein, The maintenance cover is also included, the maintenance cover is clamped with one of the frame profiles to form a power supply compartment for placing a power supply, and the splicing piece inserted with the frame profile is provided with a wire channel.

7. A combination frame as claimed in claim 6, wherein The maintenance cover is provided with a clamping claw, the outer wall of the frame profile is recessed to the inner wall to form a clamping groove matched with the clamping claw, and the outer wall of the frame profile is provided with a guide surface guiding the clamping claw to be clamped into the clamping groove.

8. A combination frame as claimed in claim 6, wherein The splicing piece has a recessed notch towards the power supply compartment, the splicing piece is provided with a lead interface and a communication interface respectively communicating with the power supply compartment and the notch, and the notch is provided with a wind deflector.

9. The combination frame of claim 1, wherein, The windward side size of the frame body is equal to the air outlet side size.

10. The combination frame of claim 1, wherein, The windward side size of the frame body is greater than the air outlet side size.

11. A modular frame according to claim 1, wherein, The frame body is provided with a drain hole, and part of the frame body is protruded from the surface to form a protrusion.

12. The combination frame of claim 1, wherein, The frame body is provided with a splicing structure for connecting adjacent frame bodies.

13. The combination frame of claim 1, wherein, The frame body is provided with a positioning hole, and the positioning hole is provided with a magnetic attraction member.

14. An electrostatic air filter, characterized by The combination frame of any one of claims 1-13 is included.

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