Improved ventilation fan structure

Abstract

This utility model relates to an improved ventilation fan structure. The improved ventilation fan structure includes a motor, a frame assembly, and blades fixedly connected to the motor shaft. The frame assembly includes a cylindrical air guide duct, with mesh covers fixedly installed at both the air inlet and outlet ends. The motor is fixed inside the mesh cover at the air inlet end of the air guide duct. An air guide body is fixedly installed on the side wall of the air guide duct, positioned along the front edge of the side air inlet, such that the side containing the major or minor axis of the side air inlet and the front end of the air guide duct together form an opening for the air guide body. The inner cavity and outer wall of the air guide body are part of the same ellipsoid. The air guide body opening faces rearward, and an opening-facing angle is provided between the air guide body opening and the motor's axis. This utility model can reduce the mutual cancellation between the airflow entering the air guide duct from the side air inlet and the airflow driven by the blades, thereby further improving the ventilation effect.

Description

Technical Field

[0001] This utility model relates to the field of ventilation fan technology, and in particular to an improved ventilation fan structure. Background Technology

[0002] A traditional ventilation fan includes a motor, blade assembly, and frame assembly. The frame assembly includes a cylindrical air duct with mesh covers fixedly installed at both the inlet and outlet ends. The motor is fixed inside the mesh cover at the inlet end of the air duct. The blade assembly includes a mounting plate and blades fixedly connected to the mounting plate, which is also fixedly connected to the motor's rotating output shaft. The motor's rotation causes the airflow to point from the inlet end of the air duct to the outlet end. The motor and electrical control device reduce the air inlet area of ​​the air duct, meaning the inner cavity area at the inlet end is smaller than the inner cavity area at the outlet end, allowing for further improvement in the ventilation effect of the traditional ventilation fan.

[0003] The ventilation fan structure disclosed in application number 2025209725363 has room for further improvement in ventilation effect due to the mutual cancellation between the airflow entering the air duct from the side air inlet and the airflow driven by the blades. Utility Model Content

[0004] One objective of this invention is to solve or alleviate the aforementioned technical problems.

[0005] The present invention employs an improved ventilation fan structure, comprising a motor, a frame assembly, and blades fixedly connected to the motor shaft. The frame assembly includes a cylindrical air guide duct, with mesh covers fixedly installed at both the air inlet and outlet ends. The motor is fixed inside the mesh cover at the air inlet end of the air guide duct. The rotation of the motor causes the airflow to proceed from the air inlet end of the air guide duct towards the air outlet end. A through side air inlet is provided on the side wall of the air guide duct, which appears semi-elliptical when viewed from the front. An air guide body is fixedly installed on the side wall of the air guide duct, positioned along the front edge of the side air inlet, such that the side containing the major or minor axis of the side air inlet and the front end of the air guide duct together form an opening for the air guide body. The inner cavity and outer wall of the air guide body are both part of the same ellipsoid. The opening of the air guide body faces rearward, and an opening-facing angle is provided between the opening of the air guide body and the axis of the motor.

[0006] The effect achieved by this invention is to reduce the mutual cancellation between the airflow entering the air duct from the side air inlet and the airflow driven by the blades, thereby further improving the ventilation effect.

[0007] A further technical solution involves rotating the blades in the same direction as the air guide opening.

[0008] A further technical solution involves an opening angle of 45 to 60 degrees.

[0009] A further technical solution involves multiple side air inlets evenly distributed around the motor shaft, or multiple rows of side air inlets evenly distributed along the motor shaft.

[0010] A further technical solution involves fixing an electrical control device, which is electrically connected to the motor, on the outside of the mesh cover at the air inlet end of the air duct. Attached Figure Description

[0011] Figure 1 This is a three-dimensional schematic diagram of an improved ventilation fan structure according to an embodiment of the present invention.

[0012] Figure 2 This is a top view of an improved ventilation fan structure according to an embodiment of the present invention; arrow 1 ARR1 indicates the orientation of the air guide opening 313; arrow 2 ARR2 indicates the approximate direction of airflow; line 1 LINE1 indicates the axis of rotation of motor 1.

[0013] Figure 3 This is a schematic diagram of DTL1 in detail one.

[0014] Figure 4 This is a rear view of an improved ventilation fan structure according to an embodiment of the present invention; the electronic control device 11 and part of the mesh cover 38 are not shown; arrow three ARR3 indicates the rotation direction of the blades 21 when the motor 1 is running.

[0015] The accompanying drawings in the specification that best illustrate the technical features of this utility model are: Figure 2 .

[0016] Arrow 1 ARR1; Arrow 2 ARR2; Arrow 3 ARR3; Detail 1 DTL1; Line 1 LINE1; Motor 1; Electrical control device 11; Blade 21; Frame assembly 3; Air duct 31; Side air inlet 311; Air guide body 312; Air guide body opening 313; Opening orientation angle 314; Mesh cover mounting buckle 319; Mesh cover 38; Support foot 39. Detailed Implementation

[0017] The specific embodiments of this utility model will now be described with reference to the accompanying drawings.

[0018] As a specific embodiment, the improved ventilation fan structure of this utility model includes a motor 1, a frame assembly 3, and blades 21 fixedly connected to the motor shaft (not shown in the figure) of the motor 1.

[0019] The frame assembly 3 includes a cylindrical air guide duct 31. Both the air inlet and outlet ends of the air guide duct 31 are fixedly equipped with mesh covers 38. For example, the mesh covers 38 are fixed to both ends of the air guide duct 31 by mesh cover mounting buckles 319 provided on the air guide duct 31. It is easy to understand that the mesh cover 38 has through holes (not shown in the attached diagram), so air can pass through the mesh cover 38 to form a blowing airflow. Typically, the air guide duct 31 is equipped with support feet 39.

[0020] The motor 1 is fixed inside the mesh cover 38 at the air inlet end of the air duct 31. An electrical control device 11, electrically connected to the motor 1, is fixed to the outside of the mesh cover 38 at the air inlet end of the air duct 31, for example, by screws. The electrical control device 11 is prior art; it is used to provide electrical energy to the motor 1 and control the motor 1's opening, closing, and rotation speed. Typically, the electrical control device 11 has a built-in secondary battery or is connected by wires to supply power to the motor 1.

[0021] like Figure 2 As shown by arrow 2 (ARR2), the rotation of motor 1 causes the airflow to move from the inlet end of the air duct 31 towards the outlet end of the air duct 31. It should be noted that arrow 2 (ARR2) only shows the approximate direction of the airflow driven by blade 21. The airflow driven by blade 21 is approximately a spiral, and arrow 2 (ARR2) roughly indicates the direction of the axis of this spiral.

[0022] The side wall of the air duct 31 has a through side air inlet 311, which is semi-elliptical when viewed from the front. The side air inlet 311 is fixedly provided with an air guide body 312, which is provided along the front edge of the side air inlet 311, so that the side where the major axis or minor axis of the side air inlet 311 is located and the front end of the air duct 31 form an air guide body opening 313. The inner cavity and outer wall of the air guide body 312 are both part of the same ellipsoid (the shape formed by rotating an ellipse around its major axis or minor axis).

[0023] The air guide opening 313 is positioned rearward, and an opening orientation angle 314 is formed between the air guide opening 313 and the axis of rotation of the motor 1 (i.e., the axis of rotation of the motor shaft of the motor 1). It is easy to understand that the air guide opening 313 is formed by the side containing the major or minor axis of the side air inlet 311 and the front end of the air guide tube 31. Therefore, the air guide opening 313 is a plane, and the angle between the straight line perpendicular to the plane of the air guide opening 313 and the axis of rotation of the motor 1 is the opening orientation angle 314. Figure 4As shown, the direction from the air inlet of the air duct 31 indicated by arrow 2 ARR2 towards the air outlet of the air duct 31 is forward; correspondingly, the opposite direction of arrow 2 ARR2 is backward. On a straight line perpendicular to the plane of the air guide opening 313, there exists a backward vector from the front edge of the side air inlet 311 towards the air guide opening 313, causing the air guide opening 313 to be positioned backward.

[0024] The working principle is as follows: after motor 1 is turned on, the rotation of motor 1 causes the airflow direction to be from the air inlet end of the air guide duct 31 to the air outlet end of the air guide duct 31. At the same time, the air is also pushed and rotated by the blades 21, and the airflow is roughly in a spiral shape. The air enters the air guide body 312 through the opening 313, faces the included angle 314, and then passes through the side air inlet 311 to enter the inner side of the air guide duct 31. During this process, the airflow direction is the same as the rotation direction of the airflow direction pushed by the blades, which can reduce the mutual cancellation between the airflow entering the air guide duct 31 from the side air inlet 311 and the airflow pushed by the blades 21, thereby further improving the ventilation effect.

[0025] As one of the specific implementation methods, such as Figure 4 As shown, the rotation direction of blade 21 is the same as the rotation direction of the air guide opening 313. (As indicated...) Figure 4 As shown, blade 21 rotates counterclockwise along the direction of arrow 3ARR3, so that the direction in which blade 21 pushes the airflow is perpendicular to the paper and inwards. Figure 4 As shown, the direction in which the air guide opening 313 points to the front edge of the side air inlet 311 is also counterclockwise (i.e., the rotation direction of the air guide opening 313), which is the same as the rotation direction of the blade 21. This can reduce the mutual cancellation between the airflow entering the air guide duct 31 from the side air inlet 311 and the airflow driven by the blade 21, thereby further improving the ventilation effect.

[0026] As one specific implementation method, the included angle 314 of the opening is between forty-five and sixty degrees.

[0027] As one specific implementation, there are multiple side air inlets 311 that are evenly distributed around the motor shaft of the motor 1 (not shown in the attached figure). The side air inlets 311 are in multiple rows (a row of side air inlets 311 evenly distributed around the motor shaft of the motor 1 is a row of side air inlets 311) and are evenly distributed along the motor shaft of the motor 1.

[0028] The terms used in this invention, such as "first," "second," etc., do not indicate any order, quantity, or importance, but are merely for distinction.

[0029] In this invention, terms such as "a" or "an" are used to indicate not a limitation on the quantity, but rather to indicate the existence of at least one of the mentioned objects.

[0030] In this utility model, terms indicating direction or location such as top, bottom, side, longitudinal, transverse, middle, center, outside, inside, horizontal, vertical, left, right, above, and below are used to indicate relative positions rather than absolute positions.

[0031] Terms used in this invention, such as "approximately," "generally," "approximately," and "similar," are limiting terms used to indicate features that are present but allow for certain deviations. The amount of deviation allowed may vary depending on the specific context; for example, regarding dimensional deviations, the specific context may include, but is not limited to, relevant standards for dimensional tolerances.

Claims

1. An improved ventilation fan structure, comprising a motor (1), a frame assembly (3), and blades (21) fixedly connected to the motor shaft of the motor (1); the frame assembly (3) includes a cylindrical air guide (31), and a mesh cover (38) is fixedly provided at both the air inlet and air outlet of the air guide (31); the motor (1) is fixed inside the mesh cover (38) at the air inlet of the air guide (31); the rotation of the motor (1) causes the airflow direction to be from the air inlet of the air guide (31) towards the air outlet of the air guide (31); The side wall of the air duct (31) is provided with a through side air inlet (311), which is semi-elliptical when viewed from the front. The side air inlet (311) is fixedly provided with an air guide body (312) on the side wall of the air duct (31). The air guide body (312) is provided along the front edge of the side air inlet (311), so that the side where the major axis or minor axis of the side air inlet (311) is located and the front end of the air duct (31) form an air guide body opening (313). The inner cavity and outer wall of the air guide body (312) are both part of the same ellipsoid. Its characteristics are, The air guide opening (313) is set to the rear, and there is an opening orientation angle (314) between the air guide opening (313) and the axis of the motor (1).

2. The improved ventilation fan structure according to claim 1, characterized in that, The direction of rotation of the blade (21) is the same as the direction of rotation of the air guide opening (313).

3. The improved ventilation fan structure according to claim 2, characterized in that, The opening faces an angle (314) of 45 to 60 degrees.

4. The improved ventilation fan structure according to claim 1, characterized in that, The side air inlets (311) are multiple and evenly distributed around the motor shaft of the motor (1). The side air inlets (311) are in multiple rows and evenly distributed along the motor shaft of the motor (1).

5. The improved ventilation fan structure according to claim 1, characterized in that, An electrical control device (11) that is electrically connected to the motor (1) is fixedly installed on the outside of the mesh cover (38) at the air inlet end of the air duct (31).

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