Wind wheel structure of centrifugal fan

Abstract

The utility model relates to a centrifugal fan wind wheel structure which comprises a wheel disc and a support ring, a plurality of wind blades distributed at equal intervals are arranged between the wheel disc and the support ring, an installation frame used for installing a stator iron core is integrally formed in the center of the wheel disc in an injection molding mode, and the side walls of the wind outlet ends of the wind blades and the outer side wall of the support ring are distributed in an inclined mode. The outer side walls of the air inlet ends of the air blades are parallel to the side wall of the mounting frame, a circle of air plates with arc-shaped cross sections are arranged on the inner side wall of the support ring and located on the air blades, the diameter of the inner ring of each air plate is equal to that of the wheel disc, and the height of the upper end face of the mounting frame is half of that of the upper end face of each air plate. The wind gathering face, making contact with the wind blades, of the wheel disc is of an arc-face-shaped structure, and the wind inlet ends of the wind blades are located on the wind gathering face. The unit energy consumption of the centrifugal fan is reduced by improving the structure of the wind wheel.

Description

Technical Field

[0001] The utility model belongs to the technical field of centrifugal fans, and in particular relates to a centrifugal fan wheel structure. Background Art

[0002] The principle of air-cooled refrigerators is to use air for refrigeration. When high-temperature air flows through the built-in evaporator, due to the high air temperature and low evaporator temperature, the two directly exchange heat, the air temperature will be reduced, and the cold air will be blown into the storage room in the refrigerator through the fan system. The air-cooled refrigerator uses this continuous circulation method to reduce the temperature in the refrigerator storage room. However, the existing air-cooled refrigerators have replaced the axial flow fan with a centrifugal fan. Because the cooling effect of the centrifugal fan is obvious, the problem in the refrigerator storage room can be quickly cooled. However, the unit energy consumption of the centrifugal fan is relatively high. While it is currently advocated to reduce the energy consumption of refrigerators, the high energy consumption of the centrifugal fan has always been a puzzle. Among them, the improvement of the wind wheel structure of the centrifugal fan is the top priority, because the core of the entire centrifugal fan is the wind wheel, and the size of the inlet and outlet air volume of the wind wheel will directly affect the energy consumption. Summary of the invention

[0003] The utility model aims to overcome the deficiencies of the prior art and to provide a centrifugal fan impeller structure, thereby reducing the unit energy consumption of the centrifugal fan by improving the impeller structure.

[0004] The purpose of the utility model is achieved through the following technical scheme. The wind wheel structure of the centrifugal fan includes a wheel disc and a bracket ring, a plurality of wind blades distributed at equal intervals are arranged between the wheel disc and the bracket ring, a mounting frame for mounting the stator core is integrally injection-molded at the center of the wheel disc, the side wall of the wind outlet end of the wind blade is inclined to the outer wall of the bracket ring, the outer wall of the wind inlet end of the wind blade is parallel to the side wall of the mounting frame, the inner wall of the bracket ring is provided with a circle of wind plates with an arc-shaped cross-section, the wind plates are located on the wind blades, the inner circle diameter of the wind plates is equal to the diameter of the wheel disc, and the upper end face height of the mounting frame is half the height of the upper end face height of the wind plate; the wind gathering surface of the wheel disc in contact with the wind blades is an arc-shaped structure, and the wind inlet end of the wind blades is located on the wind gathering surface.

[0005] The beneficial effects of the utility model are as follows: compared with the prior art, by setting the side wall of the wind blade's air outlet end in an inclined shape, the resistance at the wind blade's air outlet end is smaller during the rotation of the wind blade along with the wheel, thereby greatly reducing the unit energy consumption of the centrifugal fan; at the same time, by making the upper end surface height of the wind plate higher than the upper end surface height of the mounting frame, the air intake and air gathering effects are better, thereby greatly reducing the unit energy consumption of the centrifugal fan; and the air gathering surface is set in an arc-shaped structure, thereby making the air outlet smoother after the air is gathered, thereby improving the air outlet effect, thereby greatly reducing the unit energy consumption of the centrifugal fan.

[0006] Preferably, a gap is left between the outer wall of the wind inlet end of the wind blade and the wind collecting surface to facilitate the flow of incoming air, and one end of the wind collecting surface is located on the side of the upper end surface of the mounting frame, and the bottom surface of the other end of the wind collecting surface is flush with the bottom surface of the mounting frame; the gap and the wind collecting surface are arranged with the above structure, which not only plays a guiding role in the process of air intake, but also facilitates the air outlet during the rotation of the wind wheel, and has better flowability.

[0007] Preferably, the cross-section of the mounting frame is cylindrical, and a plurality of reinforcing blocks distributed at equal intervals are provided between the upper bottom of the wind collecting surface and the outer peripheral wall of the mounting frame; the cylindrical mounting frame facilitates the installation of the stator core, and the reinforcement blocks are provided at the same time, which not only strengthens the mounting frame, but also improves the strength between the mounting frame and the wind collecting surface, so that the wind collecting surface will not shake radially during the high-speed operation of the wind wheel.

[0008] Preferably, a plurality of annular ribs and radial ribs are provided on the bottom of the lower end of the wind collecting surface, and a plurality of the annular ribs are distributed at equal intervals along the bottom of the wind collecting surface, and a plurality of the radial ribs are arranged on the annular ribs and are distributed at equal intervals circumferentially along the center of the wind collecting surface. Through the arrangement of the above-mentioned structure, the wind collecting surface will not experience axial shaking during the high-speed operation of the wind wheel, which greatly improves the stability of the wheel during operation; at the same time, it also plays a role in strengthening the wind collecting surface.

[0009] Preferably, the upper end of the air inlet end of the wind blade is provided with an inclined chamfer; through the arrangement of the above structure, it has a guiding effect during the air intake process, and at the same time, the resistance of the wind blade during operation is also smaller, which can further reduce the unit energy consumption of the centrifugal fan.

[0010] Preferably, the wind blade is an arc-shaped structure, and the angle a between the side wall of the wind blade at the air outlet end and the outer side wall of the bracket ring is 30° to 45°; this not only makes the resistance at the air outlet end of the wind blade smaller, greatly reduces the unit energy consumption of the centrifugal fan, but also makes the air outlet efficiency higher.

[0011] Preferably, the upper end surface of the wind plate is higher than the upper end surface of the wind blade, so that the incoming air is more concentrated and the air intake efficiency is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front three-dimensional structural schematic diagram of the centrifugal fan wind wheel structure of the utility model.

[0013] Figure 2 It is a schematic diagram of the reverse three-dimensional structure of the centrifugal fan impeller structure of the utility model.

[0014] Figure 3 It is a schematic diagram of the main cross-sectional structure of the centrifugal fan impeller structure of the utility model.

[0015] The numbers in the accompanying drawings are: 1, wheel; 2, bracket ring; 3, wind blade; 4, mounting frame; 5, wind plate; 6, wind gathering surface; 7, reinforcement block; 8, annular ribs; 9, radial ribs; 31, air outlet; 32, air inlet; 33, chamfer. DETAILED DESCRIPTION

[0016] The following is a detailed introduction to the utility model in conjunction with the accompanying drawings: Figures 1 to 3 As shown, the utility model comprises a wheel disc 1 and a support ring 2, a plurality of wind blades 3 are arranged between the wheel disc 1 and the support ring 2 at equal intervals, a mounting frame 4 for mounting the stator core is integrally injection molded at the center of the wheel disc 1, the side wall of the wind outlet end 31 of the wind blade 3 is inclinedly distributed with the outer side wall of the support ring 2, the outer side wall of the wind inlet end 32 of the wind blade 3 is parallel to the side wall of the mounting frame 4, the inner side wall of the support ring 2 is provided with a circle of wind plates 5 with an arc-shaped cross section, the wind plates 5 are located on the wind blades 3, and through the arrangement of the wind plates 5, The air intake effect is better. At the same time, during the air outlet process, the wind will not go out from the upper end of the air outlet end 31 of the wind blade 3, because the setting of the wind plate 5 blocks the air outlet at the axial edge, making the air outlet efficiency higher; the inner ring diameter of the wind plate 5 is equal to the diameter of the wheel 1, and the upper end surface height of the mounting frame 4 is half of the upper end surface height of the wind plate 5, so that the air intake volume is gathered on the wind blade, thereby greatly improving the air intake and outlet volume; the wind gathering surface 6 where the wheel 1 contacts the wind blade 3 is an arc-shaped structure, and the air intake end 32 of the wind blade 3 is located on the wind gathering surface 6.

[0017] A gap is left between the outer wall of the air inlet end 32 of the wind blade 3 and the wind collecting surface 6 to facilitate the flow of incoming air, and one end of the wind collecting surface 6 is located on the side of the upper end surface of the mounting frame 4, and the bottom surface of the other end of the wind collecting surface 6 is flush with the bottom surface of the mounting frame 4.

[0018] The cross section of the mounting frame 4 is cylindrical, and a plurality of reinforcing blocks 7 distributed at equal intervals are provided between the upper bottom of the wind collecting surface 6 and the outer peripheral wall of the mounting frame 4 .

[0019] A plurality of annular ribs 8 and radial ribs 9 are provided on the bottom of the lower end of the wind-gathering surface 6. The plurality of annular ribs 8 are distributed at equal intervals along the bottom of the wind-gathering surface 6, and the plurality of radial ribs 9 are arranged on the annular ribs 8 and are distributed at equal intervals circumferentially along the center of the wind-gathering surface 6.

[0020] The upper end of the wind inlet end of the wind blade 3 is provided with an inclined chamfer 33. The support ring 2 is a hollow groove body, and a plurality of reinforcing ribs are provided in the support ring 2, so that the weight of the entire wind wheel is lighter, and the strength of the support ring 2 is better by providing the reinforcing ribs.

[0021] The wind blade 3 is an arc-shaped structure, and the angle a between the side wall of the air outlet end 31 of the wind blade 3 and the outer side wall of the bracket ring 2 is 30° to 45°; when the wind wheel rotates at a high speed, the air is radially thrown out through the wind collecting surface 6 and the wind blade 3. The arc-shaped design of the wind blade 3 makes the air outlet smoother. Through the setting of this angle, the wind energy can be diffused into the storage room of the refrigerator in time, and the resistance to the rotation of the wind blade is smaller (the contact area between the air outlet end 31 of the wind blade 3 and the air is smaller), so that the unit energy consumption of the centrifugal fan is greatly reduced.

[0022] The upper end surface of the wind plate 5 is higher than the upper end surface of the wind blade 3 .

[0023] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A centrifugal fan impeller structure, comprising a impeller disc (1) and a support ring (2), characterized in that: A plurality of wind blades (3) are arranged between the wheel disc (1) and the support ring (2) at equal intervals; a mounting frame (4) for mounting the stator core is integrally injection-molded at the center of the wheel disc (1); the side walls of the wind blades (3) at the air outlet end (31) are arranged in an inclined manner with respect to the outer side wall of the support ring (2); the outer side wall of the wind blades (3) at the air inlet end (32) is parallel to the side wall of the mounting frame (4); and the inner side wall of the support ring (2) is arranged in a parallel manner with respect to the inner side wall of the support ring (2). A circle of wind plates (5) having an arc-shaped cross section is provided on the wall, the wind plates (5) are located on the wind blades (3), the inner circle diameter of the wind plates (5) is equal to the diameter of the wheel disc (1), and the upper end surface height of the mounting frame (4) is half the upper end surface height of the wind plates (5); the wind gathering surface (6) of the wheel disc (1) in contact with the wind blades (3) is an arc-shaped structure, and the wind inlet end (32) of the wind blades (3) is located on the wind gathering surface (6).

2. The centrifugal fan impeller structure according to claim 1, characterized in that: A gap is left between the outer wall of the air inlet end (32) of the wind blade (3) and the wind collecting surface (6) to facilitate the flow of incoming air, and one end of the wind collecting surface (6) is located on the side edge of the upper end surface of the mounting frame (4), and the bottom surface of the other end of the wind collecting surface (6) is flush with the bottom surface of the mounting frame (4).

3. The centrifugal fan impeller structure according to claim 2, characterized in that: The cross section of the mounting frame (4) is cylindrical, and a plurality of reinforcement blocks (7) distributed at equal intervals are provided between the upper bottom of the wind collecting surface (6) and the outer peripheral wall of the mounting frame (4).

4. The centrifugal fan impeller structure according to claim 2, characterized in that: A plurality of annular ribs (8) and radial ribs (9) are provided on the bottom of the lower end of the wind gathering surface (6); the plurality of annular ribs (8) are distributed at equal intervals along the bottom of the wind gathering surface (6); and the plurality of radial ribs (9) are provided on the annular ribs (8) and are distributed at equal intervals in the circumferential direction along the center of the wind gathering surface (6).

5. The centrifugal fan impeller structure according to claim 1, characterized in that: The upper end of the air inlet end of the wind blade (3) is provided with an inclined chamfer (33).

6. The centrifugal fan impeller structure according to claim 1, characterized in that: The wind blade (3) is an arc-shaped structure, and the included angle a between the side wall of the wind outlet end (31) of the wind blade (3) and the outer side wall of the bracket ring (2) is 30° to 45°.

7. The centrifugal fan impeller structure according to claim 1, characterized in that: The upper end surface of the wind plate (5) is higher than the upper end surface of the wind blade (3).

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