Bionic shark fin type tongue opening noise reduction centrifugal fan

Abstract

The invention discloses a bionic shark fin type tongue opening noise reduction centrifugal fan, and belongs to the technical field of centrifugal fan structure improvement, the bionic shark fin type tongue opening noise reduction centrifugal fan comprises a fan body, a flow guide plate is installed at the air outlet position of an inner tongue opening of the fan body, the flow guide plate is of a shark fin structure, the flow guide plate comprises a main plate, and the main plate is provided with a front edge side, a tail end side and a bottom end side; the transverse projection of the front edge point on the front edge side is arc-shaped; on the cross section of the main plate, the shape of the pipeline close to the air outlet low-speed side is shrunk from the front edge side to the tail end side, and the shape of the pipeline close to the air outlet high-speed side is shrunk and then expanded from the front edge side to the tail end side; the tail end side is sequentially provided with an arc section, a nearly linear section and an S-shaped bent section from top to bottom, and the bottom end side is of a plane structure and is parallel to the air outlet of the fan body in the horizontal direction. The power utilization of the centrifugal fan can be improved, and the noise of the centrifugal fan can be reduced.

Description

Technical Field

[0001] The invention relates to a bionic shark fin type tongue-mouth noise reduction centrifugal fan, belonging to the technical field of centrifugal fans. Background Art

[0002] like Figure 4 As shown, due to the large difference in air intake volume on both sides of a conventional centrifugal fan, the airflow thrown out after the fan blades do work has a velocity gradient at different blade height positions at the blade tip, and vortices of different strengths and shapes are formed at different plane positions between the fan blades and the outlet, causing energy loss and reducing the power utilization of the centrifugal fan. In addition, when the airflows at different plane positions impact the tongue mouth, the low-speed area caused by the vortex will have a small impact force on the volute tongue and a low pressure, while the high-speed airflow on the other side has a large impact force on the volute tongue and a high pressure. The pressure gradient at the tongue mouth position of each plane will also be significant, greatly increasing the noise of the centrifugal fan. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a bionic shark fin-style tongue-mouth noise-reducing centrifugal fan, which can improve the power utilization of the centrifugal fan and reduce the noise of the centrifugal fan.

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

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

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

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

[0008] The arc segment, the near-linear segment and the S-shaped curved segment have longitudinal projection lengths of 1 cm, 3 cm and 3 cm respectively.

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

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

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

[0012] The guide plate is made of PBT or LCP.

[0013] Beneficial effects of the invention: The invention provides a bionic shark fin type tongue-mouth noise reduction centrifugal fan, a guide plate is installed at the tongue-mouth air outlet position in the fan body, the guide plate is a shark fin structure, the presence of the shark fin can reduce resistance, stabilize the flow direction, and can solve the vortexes of different intensities and shapes formed at different plane positions between the fan blades and the outlet, thereby improving the aerodynamic efficiency, that is, improving the power utilization of the centrifugal fan, and improving the airflow quality and reducing the noise of the centrifugal fan. Specifically, the leading edge point on the leading edge side is arc-shaped in the lateral projection. 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 to the separation point at the leading edge of each plane. This bionic design separates the airflow through the leading edge, and separates the high-pressure side of the tongue mouth position with reference to Bernoulli's theorem, avoiding high-pressure concentration and large pressure gradients, greatly improving the sound quality. In addition, on the transverse section of the mainboard, the shape of the pipe close to the low-speed side of the air outlet is contracted from the leading edge side to the tail end side, and the shape of the pipe close to the high-speed side of the air outlet is first contracted and then expanded 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 cross-sectional width to ensure strength. The leading edge point on the leading edge side is arc-shaped in the lateral projection, and the top arc has a certain flow guidance effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a guide plate in a bionic shark fin-style tongue-mouth noise reduction centrifugal fan of the present invention;

[0015] Figure 2 It is a structural schematic diagram of the guide plate in the present invention;

[0016] Figure 3 yes Figure 2 Schematic diagram of the structure from another angle;

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

[0018] Figure 5 It is a structural schematic diagram of the position of the guide plate in a bionic shark fin-style tongue-mouth noise reduction centrifugal fan of the present invention;

[0019] Figure 6 It is the shape and size diagram of the guide plate in the present invention;

[0020] Figure 7 It is a schematic diagram of the position of the high and low voltage dividing line of the present invention;

[0021] Figure 8 It is a schematic diagram of the cross-sectional structure of the main board in the present invention;

[0022] Fig. 9 Schematic diagram of the distribution of leading edge points on the leading edge side in the present invention;

[0023] Fig.10 It is a lateral projection diagram of the tail end side in the present invention;

[0024] The reference numerals in the figure are as follows: 1-guide plate; 11-front edge side; 12-tail end side; 13-bottom end side; 14-main board; 121-arc segment; 122-near-line segment; 123-S-shaped curved segment. DETAILED DESCRIPTION

[0025] 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 solutions of the present invention and are not intended to limit the protection scope of the present invention.

[0026] Example 1

[0027] like Figure 1 and Figure 5 As shown, the present invention discloses a bionic shark fin-style tongue-mouth noise reduction centrifugal fan, comprising a fan body, and a guide plate 1 is installed at the tongue-mouth air outlet position in the fan body. Figure 2 , Figure 3 and Figure 6 As shown, the guide plate 1 is a shark fin structure, and the guide plate 1 includes a main board 14, on which a leading edge side 11, a tail end side 12 and a bottom end side 13 are provided. The bottom end side 13 is a planar structure and is parallel to the air outlet of the fan body in the horizontal direction.

[0028] like Fig. 9 As shown, the leading edge point on the leading edge side 11 is in an arc shape in the lateral projection. The leading edge arc design is based on the distance between the fan blade and the tongue in different planes, so that the airflow is almost close to the separation point of the leading edge of each plane. This bionic design separates the airflow through the leading edge and separates the high-pressure side of the tongue position with reference to Bernoulli's theorem, avoiding high-pressure concentration and large pressure gradient, which greatly improves the sound quality.

[0029] like Figure 7 and Figure 8As shown, in the transverse cross section of the mainboard 14, the shape of the pipe near the low-speed air outlet side is contracted from the leading edge side 11 to the rear end side 12 (i.e., the distance between the mainboard side and the inner side of the fan housing gradually decreases), and the shape of the pipe near the high-speed air outlet side is contracted first and then expanded from the leading edge side 11 to the rear end side 12 (i.e., the distance between the mainboard side and the inner side of the fan housing first decreases and then increases). The high-speed airflow v is separated by the leading edge and flows into the left and right sides respectively. The airflow v1 on the left side enters the pipe and first accelerates and then decelerates to obtain v3. The airflow v2 on the right side gradually accelerates in the contracting pipe to obtain v4. The speeds of v3 and v4 are close, so that the pressure distribution on both sides is uniform, which can solve the vortex and eliminate the pressure gradient.

[0030] like Figure 2 and Figure 3 As shown, the tail end side 12 is provided with an arc segment 121, a near-line segment 122 and an S-shaped curved segment 123 from top to bottom. In the present invention, the distance represents the position of the fan shaft as the start, such as -23mm represents 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 outlet direction, and the z-axis represents the vertical direction.

[0031] Example 2

[0032] like Figure 1 and Figure 5 As shown, the present invention discloses a bionic shark fin-style tongue-mouth noise reduction centrifugal fan, comprising a fan body, and a guide plate 1 is installed at the tongue-mouth air outlet position in the fan body. Figure 2 , Figure 3 and Figure 6 As shown, the guide plate 1 is a shark fin structure, and the guide plate 1 includes a main board 14, on which a leading edge side 11, a tail end side 12 and a bottom end side 13 are provided. The bottom end side 13 is a planar structure and is parallel to the air outlet of the fan body in the horizontal direction.

[0033] like Fig. 9 As shown, the leading edge point on the leading edge side 11 is in an arc shape in the lateral projection, and the radius of the arc shape is 8mm. The leading edge arc design is based on the distance between the fan blade and the tongue in different planes, so that the airflow is almost close to the separation point of the leading edge of each plane. This bionic design separates the airflow through the leading edge and separates the high-pressure side of the tongue position with reference to Bernoulli's theorem, avoiding high-pressure concentration and large pressure gradient, which greatly improves the sound quality.

[0034] like Figure 7 and Figure 8As shown, in the transverse cross section of the main board 14, the shape of the pipe near the low-speed air outlet side is contracted from the leading edge side 11 to the tail end side 12, and the shape of the pipe near the high-speed air outlet side is contracted first and then expanded from the leading edge side 11 to the tail end side 12. The high-speed airflow v is separated by the leading edge and flows into the left and right sides respectively. The airflow v1 on the left side enters the pipe and is first accelerated and then expanded to obtain v3. The airflow v2 gradually accelerates in the contracting pipe to obtain v4. The speeds of v3 and v4 are close, so that the pressure distribution on both sides is uniform, which can eliminate vortices and reduce pressure gradients.

[0035] like Figure 2 and Figure 3 As shown, the tail end side 12 is provided with an arc segment 121, a nearly linear segment 122 and an S-shaped curved segment 123 from top to bottom, and the arc segment 121, the nearly linear segment 122 and the S-shaped curved segment 123 have longitudinal projection lengths of 1 cm, 3 cm and 3 cm respectively. In the present invention, the distance represents the position starting from the fan shaft, such as -23 mm represents 23 mm 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. Fig.10 As shown, the tail is designed in an arc shape from -23mm to -24mm (corresponding to arc segment 121), because when the fan blades rotate, the airflow here is mainly pushed in the z direction, and the arc shape has a guiding effect. The plane between -24mm and -27mm has a relatively close vortex shape, and the tail line is relatively regular (corresponding to the near-line segment 122). The plane between -27mm and -30mm has a relatively complex vortex, and the cross-section has a larger inclination angle in the pipe, so the shape of the tail bends left and right, presenting an S shape (corresponding to the S-shaped curved segment 123). In addition, between -24mm and -30mm, the widths of the near-line segment 122 and the S-shaped curved segment 123 are the same. The tail end is designed with the same width of 0.8mm, which ensures that there will be no sudden changes in the pressure gradient between the planes in the Z direction, and the structural strength is also guaranteed to a certain extent.

[0036] The above is only a preferred embodiment 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 principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A bionic shark fin-style tongue-mouth noise reduction centrifugal fan, characterized in that: The invention comprises a fan body, wherein a guide plate (1) is installed at a tongue outlet position in the fan body, the guide plate (1) is in a shark fin structure, the guide plate (1) comprises a main board (14), and a leading edge side (11), a trailing end side (12) and a bottom end side (13) are arranged on the main board (14); the leading edge point on the leading edge side (11) is in an arc shape in a transverse projection; in a transverse cross section of the main board (14), the shape of a pipe close to the low-speed air outlet side is in a contraction shape from the leading edge side (11) to the trailing end side (12), and the shape of a pipe close to the high-speed air outlet side is in a contraction-first-and-expansion shape from the leading edge side (11) to the trailing end side (12); the trailing end side (12) is in a circular arc section (121), a near-linear section (122) and an S-shaped curved section (123) are arranged in sequence from top to bottom, and the bottom end side (13) is in a planar structure and is parallel to the air outlet of the fan body in a horizontal direction.

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

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

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

5. The bionic shark fin-style tongue-mouth noise-reducing centrifugal fan according to claim 1, characterized in that: The widths of the near-linear segment (122) and the S-shaped curved segment (123) are the same.

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

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

8. The bionic shark fin-style tongue-mouth noise-reducing centrifugal fan according to claim 1, characterized in that: The material of the guide plate (1) is PBT or LCP.

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