A bionic shark fin type tongue port noise reduction centrifugal fan

Abstract

The application discloses a bionic shark fin type tongue mouth noise reduction centrifugal fan, and belongs to the technical field of centrifugal fan structure improvement. The bionic shark fin type tongue mouth noise reduction centrifugal fan comprises a fan main body, a guide plate is arranged at a tongue mouth air outlet position in the fan main body, the guide plate is in a shark fin structure, the guide plate comprises a main plate, a front edge side, a tail end side and a bottom end side are arranged on the main plate; a front edge point on the front edge side is in an arc type in a horizontal projection; on a horizontal cross section of the main plate, a pipeline shape close to a low-speed side of air outlet is in a contraction shape from the front edge side to the tail end side, and a pipeline shape close to a high-speed side of air outlet is in a contraction and then expansion shape from the front edge side to the tail end side; the tail end side is sequentially provided with an arc segment, a nearly linear segment and an S-shaped bending segment from top to bottom, and the bottom end side is in a plane structure and is parallel to an air outlet of the fan main body in a horizontal direction. The bionic shark fin type tongue mouth noise reduction centrifugal fan can improve power utilization of a centrifugal fan and reduce noise of the centrifugal fan.

Description

TECHNICAL FIELD

[0001] The present application relates to a bionic shark fin type tongue port noise reduction centrifugal fan, belonging to the technical field of centrifugal fan. BACKGROUND

[0002] As shown in the figure, the conventional centrifugal fan has a large difference in air intake on both sides, and the airflow after work by the fan blade exists a speed gradient at different blade height positions of the blade tip, forming vortexes of different intensities and shapes at different plane positions between the fan blade and the outlet, causing energy loss and reducing the power utilization of the centrifugal fan. Figure 4 In addition, when the airflow at different plane positions impacts the tongue, the impact force of the low speed area caused by the vortex on the volute tongue is small, and the pressure is low, while the impact force of the large speed airflow on the volute tongue is large, and the pressure is large, and the pressure gradient of the tongue position of each plane is also significant, greatly increasing the noise of the centrifugal fan. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the defects of the prior art and provide a bionic shark fin type tongue port noise reduction centrifugal fan which can improve the power utilization of the centrifugal fan and reduce the noise of the centrifugal fan.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is:

[0005] A bionic shark fin type tongue port noise reduction centrifugal fan, comprising a fan main body, a guide plate is installed at the tongue port air outlet position in the fan main body, the guide plate is in the shape of a shark fin, the guide plate comprises a main plate, the main plate is provided with a leading edge side, a tail end side and a bottom end side; the leading edge point on the leading edge side is in the shape of a circular arc in the horizontal projection; in the horizontal cross section of the main plate, the shape of the pipeline near the low speed side of the air outlet is in the shape of contraction from the leading edge side to the tail end side, and the shape of the pipeline near the high speed side of the air outlet is in the shape of contraction first and then expansion from the leading edge side to the tail end side; the tail end side is sequentially provided with a circular arc segment, a near-linear segment and an S-shaped curved segment from top to bottom, and the bottom end side is in the shape of a plane and is parallel to the air outlet of the fan main body in the horizontal direction.

[0006] The radius of the circular arc is 7-9mm.

[0007] The radius of the circular arc is 8mm.

[0008] The projection length of the circular arc segment, the near-linear segment and the S-shaped curved segment in the longitudinal direction is 1cm, 3cm and 3cm respectively.

[0009] The width of the near-linear segment and the S-shaped curved segment is the same.

[0010] The width of the near-linear segment and the S-shaped curved segment is 0.7-0.9mm.

[0011] The width of the near-linear section and the S-shaped curved section is 0.8 mm.

[0012] The material of the flow guide plate is PBT or LCP.

[0013] The present application provides a bionic shark fin type tongue port noise reduction centrifugal fan, the tongue port air outlet position in the fan body is provided with a flow guide plate, the flow guide plate is in the shape of a shark fin, the existence of the shark fin can reduce the resistance and stabilize the flow direction, solve the vortex of different strength and form formed by different planes between the fan blade and the outlet, improve the aerodynamic efficiency, that is, improve the power utilization of the centrifugal fan, improve the airflow quality, and reduce the noise of the centrifugal fan. Specifically, the upper front edge point on the leading edge side is in the shape of a circular arc in the transverse projection, the leading edge arc design is based on the distance between the fan blade and the tongue port in different planes, so that the airflow is almost close at the separation point of each plane leading edge, this bionic design separates the airflow through the leading edge, separates the high pressure side of the tongue port position according to Bernoulli's theorem, avoids the existence of high pressure concentration and large pressure gradient, greatly improves the sound quality, in addition, the pipe shape near the air outlet low speed side on the transverse section of the main plate is in the shape of a contraction from the leading edge side to the tail end side, and the pipe shape near the air outlet high speed side is in the shape of a contraction first and then expansion from the leading edge side to the tail end side, so that the pressure distribution on both sides is uniform, solving the vortex and eliminating the pressure gradient, finally, the tail end of the shark fin is designed with the same size of cross section width, which can ensure the strength, the upper front edge point on the leading edge side is in the shape of a circular arc in the transverse projection, and the top circular arc has a certain flow guiding effect. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structure schematic view of a flow guide plate in a bionic shark fin type tongue port noise reduction centrifugal fan of the present application;

[0015] Figure 2 is a structure schematic view of a flow guide plate in the present application;

[0016] Figure 3 is Figure 2 a structure schematic view from another angle;

[0017] Figure 4 is a airflow diagram of a conventional centrifugal fan;

[0018] Figure 5 is a structure schematic view of the position of a flow guide plate in a bionic shark fin type tongue port noise reduction centrifugal fan of the present application;

[0019] Figure 6 is a flow guide plate shape and size diagram in the present application;

[0020] Figure 7 is a high and low pressure demarcation line position schematic view in the present application;

[0021] Figure 8 is a schematic view of the cross-sectional structure of the main plate in the transverse direction in the present application;

[0022] Figure 9 is a schematic view of the distribution of the upper front edge point on the front edge side in the present application;

[0023] Figure 10 is a lateral projection view of the tail end side in the present application;

[0024] The reference signs in the drawings are as follows: 1 - deflector; 11 - front edge side; 12 - tail end side; 13 - bottom end side; 14 - main plate; 121 - circular arc segment; 122 - near-linear segment; 123 - S-shaped curved segment. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with the drawings, and the following examples are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0026] Example 1

[0027] As shown in Figure 1 and Figure 5 , the present application discloses a bionic shark fin type tongue mouth noise reduction centrifugal fan, which comprises a fan body, and a deflector 1 is installed at a tongue mouth air outlet position in the fan body. As shown in Figure 2 , Figure 3 and Figure 6 , the deflector 1 is in the form of a shark fin, and the deflector 1 comprises a main plate 14, the main plate 14 is provided with a front edge side 11, a tail end side 12 and a bottom end side 13, and the bottom end side 13 is in the form of a plane structure and is parallel to the fan body air outlet in the horizontal direction.

[0028] As shown in Figure 9 , the upper front edge point on the front edge side 11 is in the form of a circular arc in the lateral projection. The front edge arc design is based on the distance between the fan blade and the tongue mouth in different planes, so that the airflow is almost close at the separation point of each plane front edge. This bionic design separates the airflow through the front edge, separates the high-pressure side of the tongue mouth position according to Bernoulli's theorem, avoids the existence of high pressure concentration and large pressure gradient, and greatly improves the sound quality.

[0029] As shown in Figure 7 and Figure 8As shown, the main plate 14 is in a transverse cross-section, close to the low-speed side of the air outlet, the shape of the pipeline from the leading edge side 11 to the tail end side 12 is contracted (that is, the distance between the main plate side and the inner side of the fan housing gradually decreases), and close to the high-speed side of the air outlet, the shape of the pipeline from the leading edge side 11 to the tail end side 12 is first contracted and then expanded (that is, the distance between the main plate side and the inner side of the fan housing first decreases and then increases). The airflow v passing through the leading edge is divided into left and right sides, the left airflow v1 enters the pipeline and is accelerated first and then decelerated to obtain v3, and the right airflow v2 gradually accelerates in the contracted pipeline to obtain v4, the speed of v3 and v4 is close, so that the pressure distribution on both sides is uniform, which can solve the vortex and eliminate the pressure gradient.

[0030] As shown in Figure 2 and Figure 3 , the tail end side 12 is sequentially provided with a circular arc segment 121, a nearly linear segment 122 and an S-shaped curved segment 123 from top to bottom. In the present application, the distance is represented by taking the position of the fan shaft as the starting point, for example, -23mm represents a distance of 23mm below the fan shaft. In addition, the x-axis direction represents the same direction as the air outlet, the y-axis direction represents the direction perpendicular to the air outlet, and the z-axis represents the vertical direction.

[0031] Example 2

[0032] As shown in Figure 1 and Figure 5 , the present application discloses a bionic shark fin type tongue mouth noise reduction centrifugal fan, which comprises a fan body, and a guide plate 1 is installed at the tongue mouth air outlet position in the fan body. As shown in Figure 2 , Figure 3 and Figure 6 , the guide plate 1 is in the shape of a shark fin, and the guide plate 1 comprises a main plate 14, the main plate 14 is provided with a leading edge side 11, a tail end side 12 and a bottom end side 13, and the bottom end side 13 is a plane structure and is parallel to the air outlet of the fan body in the horizontal direction.

[0033] As shown in Figure 9 , the leading edge point on the leading edge side 11 is in the shape of a circular arc in the transverse projection, and the radius of the circular arc is 8mm. The leading edge arc design is based on the distance between the fan blade and the tongue mouth in different planes, so that the airflow is almost close at the separation point of each plane leading edge. This bionic design separates the airflow through the leading edge, separates the high-pressure side of the tongue mouth position according to Bernoulli's theorem, avoids the existence of high pressure concentration and large pressure gradient, and greatly improves the sound quality.

[0034] As shown in Figure 7 and Figure 8As shown in the drawings, the main plate 14 is tapered from the leading edge side 11 to the tail end side 12 in the transverse cross section, and the shape of the duct near the low-speed side of the air outlet is tapered from the leading edge side 11 to the tail end side 12. The shape of the duct near the high-speed side of the air outlet is tapered first and then expanded from the leading edge side 11 to the tail end side 12. The high-speed airflow v is divided into left and right sides after passing through the leading edge, and the left airflow v1 enters the duct and is accelerated first and then expanded to obtain v3, and the airflow v2 is gradually accelerated in the tapered duct to obtain v4. The speeds of v3 and v4 are close, so that the pressure distribution on both sides is uniform, and vortex and pressure gradient can be eliminated.

[0035] As shown in the drawings, Figure 2 and Figure 3 As shown in the drawings, the tail end side 12 is sequentially provided with a circular arc segment 121, a nearly linear segment 122 and an S-shaped curved segment 123 from top to bottom, and the projection lengths of the circular arc segment 121, the nearly linear segment 122 and the S-shaped curved segment 123 in the longitudinal direction are 1cm, 3cm and 3cm respectively. In the present application, the distance is represented by taking the position of the fan shaft as the starting point, for example, -23mm represents a distance of 23mm below the fan shaft. In addition, the x-axis direction represents the same direction as the air outlet, the y-axis direction represents the direction perpendicular to the air outlet, and the z-axis represents the vertical direction. As shown in the drawings, Figure 10 The tail part is designed in a circular arc shape at -23mm to -24mm (corresponding to the circular arc segment 121), because when the fan rotates, the airflow mainly advances in the z direction at this position, and the circular arc shape has a flow guiding effect. The plane between -24mm and -27mm is relatively regular in the tail line because the vortex form is relatively close (corresponding to the nearly linear segment 122), and the plane between -27mm and -30mm is relatively complex in the vortex, the inclination angle of the cross section in the duct is large, the shape of the tail part is left and right curved, and presents an S shape (corresponding to the S-shaped curved segment 123). In addition, the width of the nearly linear segment 122 and the S-shaped curved segment 123 is the same between -24mm and -30mm. The tail end is designed with the same width of 0.8mm, which ensures that there is no sudden change in the pressure gradient between the planes in the Z direction, and the structural strength is also guaranteed.

[0036] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A biomimetic shark fin-shaped tongue-shaped noise-reducing centrifugal fan, characterized in that: The fan body includes a fan body, and a guide plate (1) is installed at the air outlet of the fan body. The guide plate (1) has a shark fin structure. The guide plate (1) includes a main board (14). The main board (14) is provided with a leading edge side (11), a tail end side (12) and a bottom end side (13). The leading edge point on the leading edge side (11) is arc-shaped in the horizontal projection. In the horizontal cross section, the pipe shape of the main board (14) near the low-speed air outlet side is constricted from the leading edge side (11) to the tail end side (12), and the pipe shape near the high-speed air outlet side is first constricted and then expanded from the leading edge side (11) to the tail end side (12). The tail end side (12) is provided with an arc segment (121), a near-linear segment (122) and an S-shaped bend segment (123) from top to bottom. The bottom end side (13) is a planar structure and is parallel to the air outlet of the fan body in the horizontal direction.

2. The biomimetic shark fin-type tongue-shaped noise-reducing centrifugal fan according to claim 1, characterized in that: The radius of the arc is 7~9mm.

3. The biomimetic shark fin-type tongue-shaped noise-reducing centrifugal fan according to claim 2, characterized in that: The radius of the arc is 8mm.

4. The biomimetic shark fin-type tongue-shaped noise-reducing centrifugal fan according to claim 1, characterized in that: The longitudinal projection lengths of the arc segment (121), the near-linear segment (122), and the S-shaped curved segment (123) are 1cm, 3cm, and 3cm, respectively.

5. The biomimetic shark fin-type tongue-shaped noise-reducing centrifugal fan according to claim 1, characterized in that: The near-line segment (122) and the S-shaped curved segment (123) have the same width.

6. The biomimetic shark fin-type tongue-shaped noise-reducing centrifugal fan according to claim 5, characterized in that: The width of the near-line segment (122) and the S-shaped curved segment (123) is 0.7~0.9mm.

7. The biomimetic shark fin-type tongue-shaped noise-reducing centrifugal fan according to claim 6, characterized in that: The width of the near-line segment (122) and the S-shaped curved segment (123) is 0.8 mm.

8. The biomimetic shark fin-type tongue-shaped noise-reducing centrifugal fan according to claim 1, characterized in that: The guide plate (1) is made of PBT or LCP.

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