Wall-mounted exhaust fan with three air return and square exhaust outlet

Abstract

The utility model relates to a fan field especially relates to have three back air and square exhaust port's wall -hanging exhaust fan. Contain sheet metal shell, sheet metal shell contain door plant (1) and shell (2), contain a partition in shell (2) inside and divide whole structure into two parts of upper and lower, contain an orifice on this partition, the orifice is connected with two parts of upper and lower, two parts of upper and lower are exhaust fan space and exhaust fan side row space respectively, contain right back air outlet (4), bottom back air outlet (5) and left back air outlet (6) on three enclosures of exhaust fan space respectively, the shell on exhaust fan side row space corresponds and is arranged with exhaust port (8), exhaust port (8) can open the opening on wall wall, shell (2) is fixed on wall wall, right back air outlet (4), bottom back air outlet (5) and left back air outlet (6) are the mouth of multiple holes.

Description

Technical Field

[0001] This utility model relates to the field of fans, and more particularly to a wall-mounted exhaust fan with three-sided return air and a square exhaust outlet. Background Technology

[0002] With the significant improvement in living standards and economic conditions, especially against the backdrop of accelerated urbanization and industrialization, modern people have increasingly stringent requirements for indoor air quality. This is mainly due to the continuous enhancement of health awareness; people are paying more attention to the potential threats of indoor air pollution to respiratory health and overall well-being, while the importance of environmental comfort in improving daily living and working experiences is becoming increasingly prominent. Therefore, ducted exhaust fan systems have gradually become an indispensable appliance in home kitchens and commercial spaces, used to efficiently remove fumes, odors, and harmful gases such as carbon monoxide and particulate matter generated during cooking or industrial processes, ensuring continuously fresh and safe indoor air, thereby creating a healthier and more comfortable living and working space for users.

[0003] In existing technologies, traditional exhaust fans are mostly ducted exhaust fans, requiring the installation of complex duct systems. These ducts are typically made of metal or plastic, and the installation process involves precise measurements and connections. They usually must be suspended from the roof or inside the ceiling, a process that is not only time-consuming and labor-intensive but also requires professional technicians, significantly increasing installation costs and space occupation, especially in confined spaces like kitchens or commercial areas. Furthermore, this design typically has only one return air vent, and the vent area is small, resulting in poor return air efficiency, obstructed airflow, and a tendency for localized air stagnation and odor accumulation. In addition, the small return air vent is prone to generating significant wind noise, resulting in high noise levels that severely impact user comfort and efficiency, causing additional disturbance and inconvenience.

[0004] On October 24, 2025, a search was conducted in the China Patent Publication Database using "three sides and exhaust and return air" as the abstract keywords and the option to allow synonym expansion was selected. No relevant literature was found.

[0005] On October 24, 2025, an abstract search was conducted on CNKI (China National Knowledge Infrastructure) using the keywords "three-sided ventilation and exhaust ventilation and return ventilation," but no relevant literature was found. Utility Model Content

[0006] The purpose of this utility model is to provide a wall-mounted exhaust fan with better performance, featuring three-sided return air and a square exhaust vent. Specific objectives are detailed in the specific implementation section, which outlines several substantial technical effects.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A wall-mounted exhaust fan with three-sided return air and a square exhaust vent is characterized in that it includes a sheet metal housing, which includes a door panel 1 and a housing 2. The outer shell 2 contains a partition plate that divides the overall structure into upper and lower parts; The partition contains a hole; the hole connects the upper and lower parts. The upper and lower parts are the fan space and the fan side exhaust space, respectively. The three enclosure walls of the fan space contain a right return air inlet 4, a bottom return air inlet 5, and a left return air inlet 6, respectively. An exhaust port 8 is arranged on the outer casing corresponding to the side exhaust space of the fan; The exhaust vent 8 can correspond to the opening on the wall, and the outer casing 2 is fixed to the wall; The right-side return air vent 4, the bottom return air vent 5, and the left-side return air vent 6 are multi-hole vents.

[0008] A further technical solution of this utility model is that a bird-proof net is arranged on the exhaust vent 8.

[0009] A further technical solution of this utility model is that the exhaust vent 8 is square.

[0010] A further technical solution of this utility model is that an interior decorative painting is arranged on the door panel 1.

[0011] A further technical solution of this utility model is that there is a gap between the fan 7 and the door panel 1, so that the air inlet of the fan can draw air from the right return air inlet 4, the bottom return air inlet 5 and the left return air inlet 6 without being obstructed; the fan 7 is fixed to the outer casing 2 by screws.

[0012] A further technical solution of this utility model is that the right return air vent 4, the bottom return air vent 5, and the left return air vent 6 are located on three continuous surfaces of the outer shell.

[0013] A further technical solution of this utility model is that the outer shell 2 is fixed to the wall by screws.

[0014] A further technical solution of this utility model is that the surface of the outer shell 2 that is in contact with the wall is provided with sealing cotton.

[0015] The present invention, employing the above technical solution, has the following advantages over the prior art: It uses a wall-mounted installation method, installed on the side of an indoor wall, with the side mounting plate firmly fixed to the wall surface. There are no visible holes in the room during wall-mounted installation, making installation more efficient and convenient, and reducing construction time. It enables multi-angle exhaust, enhancing exhaust coverage and uniformity, and improving air purification efficiency. Simultaneously, operating noise is significantly reduced. Attached Figure Description

[0016] To further illustrate this utility model, the following description is provided in conjunction with the accompanying drawings: Figure 1 This is a diagram of the internal structure of this utility model; Figure 2 This is a schematic diagram of the front structure of this utility model; Figure 3 This is a side view of the utility model. Figure 4 This is a three-dimensional structural diagram of the utility model; The components are: 1. Door panel; 2. Outer shell; 3. Fan mounting plate; 4. Right side return air vent; 5. Bottom return air vent; 6. Left side return air vent; 7. Fan; 8. Exhaust vent; 9. Side mounting plate. Detailed Implementation

[0017] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0018] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0019] This patent provides multiple parallel solutions; the different descriptions represent improved or parallel solutions based on a basic solution. Each solution has its own unique characteristics. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other. Fixing methods not described herein can be any type of fixing, such as threaded fixing, bolt fixing, or adhesive bonding.

[0020] Example 1: Referring to all the attached drawings; A wall-mounted exhaust fan with three-sided return air and a square exhaust vent, characterized in that it includes a sheet metal outer shell, the sheet metal outer shell including a door panel 1 and an outer shell 2; The outer shell 2 contains a partition plate that divides the overall structure into upper and lower parts; The partition contains a hole; the hole connects the upper and lower parts. The upper and lower parts are the fan space and the fan side exhaust space, respectively. The three enclosure walls of the fan space contain a right return air inlet 4, a bottom return air inlet 5, and a left return air inlet 6, respectively. An exhaust port 8 is arranged on the outer casing corresponding to the side exhaust space of the fan; The exhaust vent 8 can correspond to the opening on the wall, and the outer casing 2 is fixed to the wall; The right-side return air vent 4, the bottom return air vent 5, and the left-side return air vent 6 are multi-hole openings. The substantial technical effects and implementation process, i.e., basic functions and non-obvious aspects, are as follows: Compared to the shortcomings of existing technologies—"only one return air vent, and a small vent area, resulting in poor return air effect, obstructed airflow, and easy local air stagnation and odor accumulation, due to insufficient vent size, which cannot fully draw in fresh air, causing uneven indoor airflow distribution and thus exacerbating air pollution problems"—this patent adopts a wall-mounted installation method, installed on the side of the interior wall. The side mounting plate is firmly fixed to the wall facade. There are no visible holes in the interior during wall-mounted installation, making installation more efficient and convenient, reducing construction time. Furthermore, the exhaust vents are designed to efficiently remove waste gas. Existing exhaust vents only have a single outlet and a single exhaust direction, limiting the diffusion range of waste gas. This patent, through optimized design, can achieve multi-angle exhaust, enhancing exhaust coverage and uniformity, and improving air purification efficiency. At the same time, the noise level is significantly reduced during operation. Due to the large return air area, the noise is low, effectively preventing external dust or foreign objects from entering the room and ensuring a clean indoor environment. Furthermore, due to the concealed structure, the wall openings are completely invisible, maintaining a beautiful and tidy appearance.

[0021] Example 2: As a further improvement, parallel, or optional independent solution, a bird net is installed on the exhaust vent 8. The substantial technical effect and its implementation process, i.e., the basic function and non-obviousness, are as follows: it can prevent birds from entering the room.

[0022] Example 3: As a further improvement, parallel solution, or optional independent solution, the exhaust vent 8 is square. The substantial technical effect and its implementation process, i.e., the basic function and non-obviousness, are as follows: similar shapes are all within the scope of protection of this patent.

[0023] Example 4: As a further improvement, parallel, or optional independent solution, interior decorative paintings are arranged on door panel 1. The substantial technical effect and its implementation process, i.e., basic function and non-obviousness, are as follows: not only are the holes not visible from the interior, but the paintings also serve a decorative function.

[0024] Example 5: As a further improvement, parallel, or optional independent solution, a gap exists between the fan 7 and the door panel 1, so that the fan's air inlet can draw air from the right return air inlet 4, the bottom return air inlet 5, and the left return air inlet 6 without obstruction; the fan 7 is fixed to the outer casing 2 with screws. The substantial technical effect and its implementation process, i.e., the basic function and non-obviousness, are as follows: avoiding excessive wind resistance.

[0025] Example 6: As a further improvement, parallel solution, or optional independent solution, the right return air vent 4, the bottom return air vent 5, and the left return air vent 6 are located on three continuous surfaces of the casing. The substantial technical effect and its implementation process, i.e., the basic function and non-obviousness, are as follows: Therefore, air can be returned from all three surfaces.

[0026] Example 7: As a further improvement, parallel solution, or optional independent solution, the outer casing 2 is fixed to the wall with screws. Similar fixing methods are all within the scope of protection of this patent.

[0027] Example 8: As a further improvement, parallel solution, or optional independent solution, the wall-facing side of the outer casing 2 is provided with sealing cotton. This improves the sealing effect.

[0028] Innovatively, each of the above effects exists independently, yet a single structure can be used to combine the results.

[0029] It should be noted that the multiple modules in this patent are an integration of existing technology modules and do not involve any new modules. Even if some modules use programs, those programs are undoubtedly known programs.

[0030] It should be noted that the multiple solutions provided in this patent include their own basic solutions, which are independent of each other and do not restrict each other. However, they can also be combined with each other without conflict to achieve multiple effects.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims.

Claims

1. A wall-mounted exhaust fan with three-sided return air and a square exhaust vent, characterized in that, It includes a sheet metal shell, which includes a door panel (1) and a shell (2). The outer shell (2) contains a partition plate that divides the overall structure into upper and lower parts; The partition contains a hole; the hole connects the upper and lower parts. The upper and lower parts are the fan space and the fan side exhaust space, respectively. The three enclosure walls of the fan space contain a right return air inlet (4), a bottom return air inlet (5), and a left return air inlet (6), respectively. An exhaust port (8) is arranged on the outer casing corresponding to the side exhaust space of the fan. The exhaust vent (8) can correspond to the opening on the wall, and the outer casing (2) is fixed to the wall; The right return air vent (4), the bottom return air vent (5), and the left return air vent (6) are multi-hole vents.

2. The wall-mounted exhaust fan with three-sided return air and a square exhaust vent as described in claim 1, characterized in that, A bird-proof net is installed on the exhaust vent (8).

3. The wall-mounted exhaust fan with three-sided return air and a square exhaust vent as described in claim 1, characterized in that, The exhaust vent (8) is square.

4. The wall-mounted exhaust fan with three-sided return air and a square exhaust vent as described in claim 1, characterized in that, Interior decorative paintings are arranged on the door panel (1).

5. The wall-mounted exhaust fan with three-sided return air and a square exhaust vent as described in claim 1, characterized in that, There is a gap between the fan (7) and the door panel (1), so the air inlet of the fan can draw air from the right return air inlet (4), the bottom return air inlet (5) and the left return air inlet (6) without being obstructed; the fan (7) is fixed to the outer casing (2) by screws.

6. The wall-mounted exhaust fan with three-sided return air and a square exhaust vent as described in claim 1, characterized in that, The right return air vent (4), the bottom return air vent (5), and the left return air vent (6) are located on three continuous surfaces of the casing.

7. The wall-mounted exhaust fan with three-sided return air and a square exhaust vent as described in claim 1, characterized in that, The outer casing (2) is fixed to the wall with screws.

8. The wall-mounted exhaust fan with three-sided return air and a square exhaust vent as described in claim 1, characterized in that, The outer shell (2) has sealing cotton on the wall-facing side.

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