A suction fan
By setting guide plates and baffles in the exhaust box, designing two independent exhaust circuits, and adjusting the air volume through air valves, the problem of uneven air blowing during film drying was solved, achieving a more uniform exhaust effect and improving the uniformity of film drying.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-28
- Publication Date
- 2026-07-07
AI Technical Summary
Existing technologies neglect the uniformity of solvent content in the environment of the film during the film drying process, resulting in uneven blowing and ventilation, which affects the uniformity of drying.
An exhaust fan box was designed, which includes a guide plate and a baffle plate. It has two independent exhaust circuits, and the air volume is adjusted by the air valve. The guide plates are arranged in an alternating manner to balance the exhaust volume. The return air chamber is equipped with an air valve individually or in part to adjust the air volume.
This achieves a more uniform airflow distribution on the exhaust surface, effectively reducing the unevenness of airflow near the exhaust source and improving the uniformity of film drying.
Smart Images
Figure CN224470721U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of bellows technology, specifically relating to an exhaust bellows. Background Technology
[0002] An exhaust fan box is a device used to exhaust or transport air. It can be driven by an electric motor or other power source to draw air out or transport it to a specific location. Exhaust fan boxes are commonly used in industrial production, construction sites, ventilation systems, and air conditioning systems. They effectively remove harmful gases, control indoor temperature, and maintain air circulation.
[0003] In China's film industry, hot air circulation is used for drying films from a liquid state to a solid or semi-solid state. The uniformity of drying has a crucial impact on the various properties of the film. Factors affecting the uniformity of film drying include the uniformity of airflow and the uniformity of solvent content in the film's environment. While existing technologies have largely addressed the uniformity of airflow, they often neglect the influence of the uniformity of solvent content in the film's environment on the drying uniformity, leading to uneven solvent content, uneven airflow, and uneven exhaust. Utility Model Content
[0004] The technical problem this invention aims to solve is to overcome the shortcomings of existing technologies and provide an exhaust fan box to address the issues raised in the background section regarding the need for hot air circulation in the domestic film industry to dry films from a liquid to a solid or semi-solid state. The uniformity of drying is crucial to the various properties of the film. Factors affecting the uniformity of film drying include the uniformity of airflow and the uniformity of solvent content in the film's environment. While existing technologies have largely addressed the uniformity of airflow, they often neglect the impact of the uniformity of solvent content in the film's environment on the film's drying uniformity, leading to problems of uneven solvent content, uneven airflow, and uneven exhaust.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an exhaust fan box, comprising an exhaust fan box body and a membrane surface, wherein a second exhaust port is provided on one side of the upper end of the exhaust fan box body, and a first exhaust port is provided on the other side of the upper end of the exhaust fan box body; a partition is fixedly connected inside the exhaust fan box body, a second exhaust chamber is provided on the left side of the partition, an exhaust chamber backflow plate is fixedly connected to the upper end of the second exhaust chamber, a first exhaust chamber is provided on the right side of the partition, an exhaust chamber guide plate is fixedly connected to the lower end of the first exhaust chamber, a second air valve is provided between the first exhaust port on the left side and the partition, and a first air valve is provided between the first exhaust port on the right side and the partition; both the first air valve and the second air valve have rotating parts fixedly connected inside; a second return air port is provided at one end of the second exhaust chamber, a second return air chamber is provided on one side of the second exhaust chamber, and a second exhaust chamber partition is provided between the second exhaust chamber and the second return air chamber.
[0006] Preferably, each of the second exhaust chambers has an exhaust hole at its lower interior.
[0007] Preferably, the first exhaust port, the first exhaust chamber, the exhaust chamber guide plate, and the air valve 7 form an exhaust circuit A.
[0008] Preferably, the second exhaust port, the second exhaust chamber, the exhaust chamber backflow plate, and the second air valve form an exhaust circuit B.
[0009] Preferably, both the first air valve and the second air valve are rotatably connected to the first exhaust port via a rotating component.
[0010] Preferably, the air volume of the exhaust circuit A can be adjusted independently by the second air valve.
[0011] Preferably, the air volume of the exhaust circuit B can be adjusted independently via the second air valve.
[0012] Preferably, the air extraction chamber guide plate is at an angle α to the plane where the first air extraction port is located, the air extraction chamber backflow plate is at an angle β to the plane where the second air extraction port is located, and the plane where the first air extraction port is located and the plane where the second air extraction port is located are the same plane, where α+β is 180°.
[0013] Compared with the prior art, the present invention provides an exhaust fan box, which has the following beneficial effects:
[0014] 1. This utility model features an exhaust fan box with guide plates to ensure more uniform airflow from the exhaust surface. The guide plates in the return air chamber are arranged in a staggered pattern to further balance the uniformity of the airflow from the exhaust surface. Each return air chamber is equipped with a valve individually or partially to adjust the airflow in each return air chamber, thus allowing for more flexible adjustment of the uniformity of the exhaust airflow. Structurally, for simplicity and cost considerations, only one exhaust port or a square box is opened on one side of the oven, and some exhaust holes are arranged on the exhaust surface. As a result, the negative pressure is greater closer to the exhaust source, and the exhaust volume is greater under the same opening conditions, causing uneven airflow from the film surface. Therefore, by arranging guide plates in the exhaust chamber, the problem of large exhaust volume near the exhaust source is effectively reduced.
[0015] 2. By setting up a partition, the exhaust box is equipped with two exhaust circuits. The two exhaust circuits are independent of each other and can adjust the exhaust volume through their respective air valves. The two exhaust circuits are arranged symmetrically and alternately. The side with a large exhaust volume of exhaust circuit A and the side with a small exhaust volume of exhaust circuit B complement each other, which can further balance the uneven exhaust volume.
[0016] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a scientific and reasonable structure, is safe and convenient to use, and provides great help to people. Attached Figure Description
[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0018] Figure 1 This is an isometric structural diagram of one side of an exhaust fan box according to the present invention.
[0019] Figure 2 This is a schematic diagram of the exhaust box body structure of an exhaust box proposed in this utility model;
[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the exhaust circuit of the exhaust box proposed in this utility model;
[0021] Figure 4 This is a schematic diagram of the cross-sectional structure of the exhaust circuit A of the exhaust box proposed in this utility model;
[0022] Figure 5 This is a schematic diagram of the B-loop exhaust circuit proposed in this utility model;
[0023] In the figure: First exhaust port 1, Second exhaust port 2, First exhaust chamber 3, Second exhaust chamber 4, Exhaust chamber guide plate 5, Exhaust chamber backflow plate 6, First air valve 7, Second air valve 8, Exhaust box body 9, Partition plate 10, Rotating component 11, Membrane surface 12, Second return air port 13, Second exhaust chamber partition plate 14, Second return air chamber 15. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0025] Please see Figure 1-5 This utility model provides a technical solution: an exhaust box, including an exhaust box body 9 and a membrane surface 12. A second exhaust port 2 is provided on one side of the upper end of the exhaust box body 9, and a first exhaust port 1 is provided on the other side of the upper end of the exhaust box body 9. A partition 10 is fixedly connected inside the exhaust box body 9. A second exhaust chamber 4 is provided on the left side of the partition 10, and an exhaust chamber backflow plate 6 is fixedly connected to the upper end of the second exhaust chamber 4. A first exhaust chamber 3 is provided on the right side of the partition 10, and an exhaust chamber guide plate 5 is fixedly connected to the lower end of the first exhaust chamber 3. A second air valve 8 is provided between the first exhaust port 1 on the left and the partition 10, and a first air valve 7 is provided between the first exhaust port 1 on the right and the partition 10. Rotating components 11 are fixedly connected inside both the first air valve 7 and the second air valve 8. The exhaust box is equipped with guide plates, which can... To make the exhaust surface more uniform, the guide plates in the return air chamber are arranged in an alternating pattern to further balance the uniformity of the exhaust volume. Each return air chamber is equipped with an air valve individually or partially to adjust the air volume of each return air chamber, thereby more flexibly adjusting the uniformity of the exhaust volume. In terms of structure, for the sake of simplicity and cost considerations, only one exhaust port or a square box is opened on one side of the oven, and some exhaust holes are arranged on the exhaust surface. As a result, the negative pressure is greater closer to the exhaust source, and the exhaust volume is greater under the same opening conditions, causing uneven exhaust on the film surface. Therefore, guide plates are arranged in the exhaust chamber to effectively reduce the problem of large exhaust volume near the exhaust source. A second return air port 13 is provided at one end of the second exhaust chamber 4, and a second return air chamber 15 is provided on one side of the second exhaust chamber 4. A second exhaust chamber partition 14 is provided between the second exhaust chamber 4 and the second return air chamber 15.
[0026] In this utility model, preferably, the lower end of the interior of the second exhaust chamber 4 is provided with an exhaust hole. The first exhaust port 1, the first exhaust chamber 3, the exhaust chamber guide plate 5 and the air valve 7 form an exhaust circuit A. The second exhaust port 2, the second exhaust chamber 4, the exhaust chamber backflow plate 6 and the second air valve 8 form an exhaust circuit B. The first air valve 7 and the second air valve 8 are rotatably connected to the first exhaust port 1 through a rotating part 11. The exhaust air volume of the exhaust circuit A can be adjusted independently by the second air valve 8. The exhaust air volume of the exhaust circuit B can be adjusted independently by the second air valve 8. The exhaust chamber guide plate 5 is at an angle α to the plane where the first exhaust port 1 is located. The exhaust chamber backflow plate 6 is at an angle β to the plane where the second exhaust port 2 is located. The plane where the first exhaust port 1 is located and the plane where the second exhaust port 2 is located are the same plane, where α+β is 180°.
[0027] The ventilation circuit B achieves the following circulation path: air enters the second ventilation chamber 4 from the second ventilation port 2. Due to the action of the ventilation chamber backflow plate 6 and the second ventilation chamber partition 14, the air enters the second return air chamber 15 through the second return air port 13. The second air valve 8 at the outlet of the second return air chamber 15 can adjust the air volume.
[0028] The working principle and usage process of this utility model are as follows: During use, the exhaust fan box is equipped with guide plates to ensure more uniform airflow from the exhaust surface. The return air chamber guide plates are arranged in a staggered pattern to further balance the uniformity of the exhaust volume. Each return air chamber is equipped with individual or partial air valves to adjust the airflow in each chamber, thus allowing for more flexible adjustment of the uniformity of the exhaust airflow. Structurally, for simplicity and cost considerations, only one exhaust port or a square box is opened on one side of the oven, and some exhaust holes are arranged on the exhaust surface, thereby increasing the negative pressure closer to the exhaust source. The larger the opening, the greater the air volume, resulting in uneven air extraction on the membrane surface. Therefore, a guide plate is arranged in the exhaust chamber to effectively reduce the problem of large air volume near the exhaust source. By setting a partition 10, the exhaust box is equipped with two exhaust circuits. The two exhaust circuits are independent of each other and can adjust the air volume through their respective air valves. The two exhaust circuits are arranged symmetrically and alternately. The side with large air volume of exhaust circuit A and the side with small air volume of exhaust circuit B complement each other, which can further balance the uneven air volume.
[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An exhaust fan box, comprising an exhaust fan box body (9) and a membrane surface (12), characterized in that: A second exhaust port (2) is provided on one side of the upper part of the exhaust box body (9), and a first exhaust port (1) is provided on the other side of the upper part of the exhaust box body (9). A partition (10) is fixedly connected inside the exhaust box body (9). A second exhaust chamber (4) is provided on the left side of the partition (10). An exhaust chamber backflow plate (6) is fixedly connected to the upper part of the second exhaust chamber (4). A first exhaust chamber (3) is provided on the right side of the partition (10). An exhaust chamber guide plate is fixedly connected to the lower part of the first exhaust chamber (3). (5) A second air valve (8) is provided between the first exhaust port (1) on the left and the partition (10), and a first air valve (7) is provided between the first exhaust port (1) on the right and the partition (10). A rotating part (11) is fixedly connected inside the first air valve (7) and the second air valve (8). A second return air port (13) is provided at one end of the second exhaust chamber (4), and a second return air chamber (15) is provided on one side of the second exhaust chamber (4). A second exhaust chamber partition (14) is provided between the second exhaust chamber (4) and the second return air chamber (15).
2. The exhaust fan box according to claim 1, characterized in that: The first exhaust port (1), the first exhaust chamber (3), the exhaust chamber guide plate (5) and the first air valve (7) form an exhaust circuit A.
3. The exhaust fan box according to claim 1, characterized in that: The second exhaust port (2), the second exhaust cavity (4), the exhaust cavity backflow plate (6), the second return air port (13), the second return air cavity (15), and the second air valve (8) form an exhaust circuit B.
4. The exhaust fan box according to claim 1, characterized in that: The first air valve (7) and the second air valve (8) are rotatably connected to the first exhaust port (1) via a rotating component (11).
5. The exhaust fan box according to claim 2, characterized in that: The air volume of the exhaust circuit A can be adjusted individually by the first air valve (7).
6. The exhaust fan box according to claim 3, characterized in that: The air volume of the exhaust circuit B can be adjusted independently through the second air valve (8).
7. The exhaust fan box according to claim 1, characterized in that: The air extraction chamber guide plate (5) is at an angle α to the plane where the first air extraction port (1) is located, and the air extraction chamber backflow plate (6) is at an angle β to the plane where the second air extraction port (2) is located. The plane where the first air extraction port (1) is located and the plane where the second air extraction port (2) is located are the same plane, where α+β is 180°.