Centrifugal fan outlet drainage plate structure

Abstract

The centrifugal fan outlet drainage plate structure comprises a main plate, an upper cover side and a base side are arranged on the left side and the right side of the main plate respectively, a front edge line is arranged on the main plate close to an air outlet, a rear edge line is arranged on the main plate far away from the air outlet, and the section of the main plate in the air outlet direction is of a wing-shaped structure. The installation angle of the wing-shaped structure is gradually reduced in the direction from the upper cover side to the base side, the chord length of the wing-shaped structure is gradually reduced in the direction from the middle to the upper cover side and the base side, and on the projection perpendicular to the air outlet direction, the front edge point of the front edge line exceeds the edge position of the high-speed area. According to the centrifugal fan outlet drainage plate structure, the air volume can be increased, noise can be reduced, and the power consumption utilization rate can be improved.

Description

Technical Field

[0001] The utility model relates to a centrifugal fan outlet guide plate structure, belonging to the technical field of centrifugal fans. Background Art

[0002] The airflow distribution at the outlet of a conventional centrifugal fan is uneven, the airflow distribution in each cross-section varies greatly, and the energy loss caused by the velocity gradient is serious. The closer the cross-section is to the upper cover, the more chaotic the airflow distribution is, and the more obvious the eddy current intensity is. The airflow generated by the work of the fan blades is sucked back into the tongue mouth due to the influence of backflow, which manifests itself in reduced air volume, increased eddy current noise, and increased power consumption in terms of performance. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a centrifugal fan outlet guide plate structure, which can increase the air volume, reduce noise, and improve power consumption utilization.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A centrifugal fan outlet guide plate structure comprises a main board, wherein an upper cover side and a base side are respectively arranged on the left and right sides of the main board, a leading edge line is arranged on the main board close to an air outlet, and a trailing edge line is arranged away from the air outlet, the main board has an airfoil structure in the air outlet direction profile, the installation angle of the airfoil structure gradually decreases along the direction from the upper cover side to the base side, the chord length of the airfoil structure gradually decreases along the direction from the middle to both sides of the upper cover side and the base side, and in the projection perpendicular to the air outlet direction, the leading edge point of the leading edge line exceeds the edge position of the high-speed zone.

[0006] The maximum chord length position of the airfoil structure is located at the center line of the main board.

[0007] The leading edge line is projected in a wave shape perpendicular to the wind outlet direction.

[0008] The trailing edge line is projected in a wave shape perpendicular to the wind outlet direction.

[0009] The thickness of the trailing edge line is 0.45 to 0.5 mm.

[0010] The distance between the upper cover side and the base side is 5.5-6.5 mm.

[0011] The beneficial effects of the utility model are as follows: the section of the mainboard in the air outlet direction is an airfoil structure, the installation angle of the airfoil structure gradually decreases along the direction from the upper cover side to the base side, the chord length of the airfoil structure gradually decreases along the direction from the middle to the upper cover side and the base side, and the improved aerodynamic parameters (chord length, installation angle) of each section are adjusted according to the position of the high / low speed area of ​​each section, so that the low pressure area near each section is increased. In addition, in the vertical projection of the air outlet direction, the leading edge point of the leading edge line exceeds the edge position of the high-speed area, and the curvature of the leading edge line is reasonably designed to avoid the contact between the leading edge point position of each section and the high-speed area, so that the high-speed airflow flows along the upper surface of the airfoil, greatly reducing the noise impact caused by the high-speed area position. In terms of flow, it is manifested as the high-speed area airflow near the blade tip and the airflow sucked by the tongue mouth flowing into the low-pressure area near the guide device and then flowing out to the outlet. In summary, the utility model utilizes the velocity gradient of each section of the outlet to guide the airflow toward the outlet, and reduces the backflow intensity at the tongue mouth position. In terms of performance, it is manifested as increased air volume, improved power consumption utilization, and reduced noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the position structure of a centrifugal fan outlet guide plate structure of the utility model;

[0013] Figure 2 This is a structural schematic diagram of a centrifugal fan outlet guide plate structure of the utility model;

[0014] Figure 3 It is a schematic diagram of the dimensions of the guide plate structure of the utility model;

[0015] Figure 4 It is a position diagram of the leading edge point on a certain cross section of the guide plate of the utility model;

[0016] Figure 5 The cross-sectional shape diagram of the guide plate of the utility model at different positions;

[0017] Figure 6 for Figure 5 A schematic diagram of the structure with an enlarged middle section;

[0018] Figure 7 This is the airfoil diagram of the guide plate of the utility model;

[0019] Figure 8 This is a schematic diagram of the chord length and installation angle of the guide plate of the utility model;

[0020] Fig. 9 This is a diagram showing the changes in chord length and installation angle of the guide plate of the utility model.

[0021] The reference numerals in the figure are as follows: 1-main board; 11-upper cover side; 12-base side; 13-front edge line; 14-rear edge line. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the protection scope of the present invention.

[0023] like Figure 1 and Figure 2 As shown, the utility model discloses a centrifugal fan outlet guide plate structure, including a main board 1, a cover side 11 and a base side 12 are respectively arranged on the left and right sides of the main board 1, a front edge line 13 is arranged near the air outlet of the main board 1, and a rear edge line 14 is arranged away from the air outlet. The front edge line 13 is projected vertically in the air outlet direction to be wavy, and the rear edge line 14 is projected vertically in the air outlet direction to be wavy. Figure 3 As shown, the maximum chord length of the airfoil structure is at the center line of the main board 1. The spacing between the upper cover side 11 and the base side 12 is 5.5-6.5 mm. In this embodiment, the spacing between the upper cover side 11 and the base side 12 is preferably 6.05 mm. The thickness of the trailing edge line 14 is 0.45-0.5 mm to ensure structural strength.

[0024] like Figure 7 As shown, the mainboard 1 has an airfoil structure in the air outlet direction, and the upper and lower airfoil parameter points are fine-tuned in the NACA airfoil configuration. Figure 5 and Figure 6 The sectional structure diagram of the airfoil structure of the utility model at different positions. Figure 8 and Fig. 9 As shown, the installation angle of the airfoil structure gradually decreases from the upper cover side 11 to the base side 12, and the chord length of the airfoil structure gradually decreases from the middle to the upper cover side 11 and the base side 12. The improved aerodynamic parameters (chord length, installation angle) of each section are adjusted according to the position of the high / low speed area of ​​each section, so that the low pressure area near each section is increased.

[0025] like Figure 4 As shown, in the projection vertical to the wind outlet direction, the leading edge point of the leading edge line 13 exceeds the edge position of the high-speed zone, and the curvature of the leading edge line is reasonably designed to avoid the contact between the leading edge points of each section and the high-speed zone, which greatly reduces the noise impact caused by the high-speed zone position. In terms of flow, it is manifested as the high-speed zone airflow near the blade tip and the airflow sucked by the tongue mouth flowing into the low-pressure zone near the drainage device and then flowing out to the outlet.

[0026] The above are only preferred implementations of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A centrifugal fan outlet guide plate structure, characterized in that: The invention comprises a main board (1), wherein the left and right sides of the main board (1) are respectively provided with an upper cover side (11) and a base side (12); the main board (1) is provided with a leading edge line (13) close to an air outlet, and a trailing edge line (14) away from the air outlet; the main board (1) has an airfoil-shaped structure in its air outlet direction section; the installation angle of the airfoil-shaped structure gradually decreases along the direction from the upper cover side (11) to the base side (12); the chord length of the airfoil-shaped structure gradually decreases along the direction from the middle to both sides of the upper cover side (11) and the base side (12); and in a projection perpendicular to the air outlet direction, the leading edge point of the leading edge line (13) exceeds the edge position of the high-speed zone.

2. According to claim 1, a centrifugal fan outlet guide plate structure is characterized in that: The maximum chord length position of the airfoil structure is located at the center line of the main board (1).

3. The centrifugal fan outlet guide plate structure according to claim 1, characterized in that: The leading edge line (13) is projected in a wave shape perpendicular to the wind outlet direction.

4. The centrifugal fan outlet guide plate structure according to claim 1, characterized in that: The trailing edge line (14) is projected in a wave shape perpendicular to the wind outlet direction.

5. The centrifugal fan outlet guide plate structure according to claim 1, characterized in that: The thickness of the trailing edge line (14) is 0.45-0.5 mm.

6. The centrifugal fan outlet guide plate structure according to claim 1, characterized in that: The distance between the upper cover side (11) and the base side (12) is 5.5 to 6.5 mm.

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