A diagonal flow fan with a guide blade structure

Abstract

The invention provides a diagonal flow fan with a guide vane structure. In the cross-sectional projection view through the central axis of the fan, the leading edge of the return outer shell guide vane and the trailing edge of the return inner shell guide vane have a projection overlap region, and the overlap region is a parallelogram; in the axial projection view along the central axis of the fan, the projection of the twisted guide vane and the projection of the second guide vane intersect, the leading edge projection of the twisted guide vane and the inner edge projection of the second guide vane overlap in the axial direction, the trailing edge projection of the twisted guide vane and the outer edge projection of the second guide vane are offset in the same circumferential direction, and the projection of the first guide vane is located in the offset region. Due to the improvement of the guide vane structure of the diagonal flow fan, the flow characteristics are improved, the noise is reduced, and the conveying efficiency is improved.

Description

Technical Field

[0001] The present invention relates to an oblique flow fan with a guide blade structure, and in particular to a guide blade structure capable of improving flow guiding efficiency and reducing wind resistance and noise. Background Art

[0002] A diagonal flow fan is a fluid machine that has multiple rotating blades arranged radially with the hub as the center, and blows air in multiple directions to the rotating blades while rotating them through a motor, thereby promoting heat dissipation in air-cooled heat exchangers such as electric fans or ventilation fans, or radiators or condensers in cars. As products such as life production develop towards intensification and high power, the demand for ventilation and heat dissipation is increasing, and the ventilation performance of diagonal flow fans is attracting more and more attention. Therefore, it is particularly important to design and study diagonal flow fans to improve their characteristics.

[0003] Prior art CN104074805A discloses a centrifugal fan with a double-guide vane axial guide, which adjusts the fan wind pressure and flow rate by fixing the angle of the second-stage guide and changing the angle of the first-stage guide vane. While changing the angle of the first-stage guide vane to change the fan wind pressure and flow rate, the airflow is caused to have a certain pre-rotation before entering the second-stage guide vane, and the guide vane angle of the second-stage guide vane is fixed at the optimal angle required by the fan impeller, that is, to ensure that the airflow always enters and passes through the fan impeller blade channel smoothly at the optimal pre-rotation angle, so as to keep the fan running efficiently. The optimal angle of the guide vane of the secondary guide vane can be determined according to the impeller installation angle designed for the fan, or according to experiments.

[0004] However, the above-mentioned fans all have design limitations, poor adaptability, high power consumption, unstable air output, low heat dissipation efficiency, high noise and strong vibration. Therefore, in response to these problems, the applicant proposes a diagonal flow fan with a guide vane structure to solve the above-mentioned problems so as to improve the flow characteristics, reduce the impeller wind resistance and noise, and thus improve the air output effect and efficiency. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a diagonal flow fan with a guide vane structure.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A diagonal flow fan with a guide vane structure comprises a motor 1, which is connected to a hub 2 and drives it to rotate. A blade 3 is mounted on the hub 2, and the outer edge of the blade 3 is fixed on the inner side of an impeller cover ring 8; it is characterized in that a return inner shell 4, a return outer shell 5, and an inlet guide vane structure 9 constitute a volute air duct of the diagonal flow fan; one end of the inlet guide vane structure 9 is integrally connected to one end of the return outer shell 5, the return inner shell 4 and the return outer shell 5 form an annular return channel, one end of the return outer shell guide vane 6 is mounted on the inner wall of the return outer shell 5, and the other end is located in the annular return channel and is not connected to the outer wall of the return inner shell 4; one end of the return inner shell guide vane 7 is mounted on the outer wall of the return inner shell 4, and the other end is located in the annular return channel and is not connected to the outer wall of the return outer shell 5; in a cross-sectional projection view passing through the central axis of the fan, there is a projection overlap area between the leading edge of the return outer shell guide vane 6 and the trailing edge of the return inner shell guide vane 7, and the overlap area is a parallelogram The flow surface of the inlet guide vane structure 9 includes a first conical annular surface 91, an arc annular surface 92, a second conical annular surface 93, and a cylindrical plane 94 in sequence. The center line of the cylindrical plane 94 is collinear with the central axis of the fan. The bent and twisted guide vane 10 is installed on the inner wall surface of the second conical annular surface 93. The first guide vane 11 and the second guide vane 12 are installed on the inner wall surface of the cylindrical plane 94 in sequence. The first guide vane 11 is located between the bent and twisted guide vane 10 and the second guide vane 12. Both the first guide vane 11 and the second guide vane 12 are straight plate guide vanes. In the axial projection view along the central axis of the fan, the projection of the bent and twisted guide vane 10 and the projection of the second guide vane 12 are intersected. The projection of the leading edge 101 of the bent and twisted guide vane and the projection of the inner edge 121 of the second guide vane coincide in the axial direction. The projection of the trailing edge 102 of the bent and twisted guide vane and the projection of the outer edge 122 of the second guide vane are offset in the same circumferential direction. The projection of the first guide vane 11 is located in the offset area.

[0008] Further, the position of the intersection point of the projection of the twisted guide vane 10 and the projection of the second guide vane 12 is closer to the cylindrical plane 94 side.

[0009] Further, the radial height of the annular return channel is L, the radial height of the return outer casing guide vane 6 is L1, and the radial height of the return inner casing guide vane 7 is L2, wherein L1>L2.

[0010] Further, L1+L2=(1.1-1.5)L.

[0011] Further, L1 = (1.1-1.3) L2.

[0012] Furthermore, the projection position of the first guide vane 11 in the misaligned region is closer to the projection position of the trailing edge 102 of the twisted guide vane in the circumferential direction.

[0013] Furthermore, the inlet guide vane structure 9 has an ejection channel 100 , which is arc-shaped, with an ejection channel inlet located at the first conical annular surface 91 and an ejection channel outlet located at the second conical annular surface 93 .

[0014] Furthermore, in the airflow inlet direction, the angle between the inlet of the ejector channel and the vertical direction is A, and in the airflow outlet direction, the angle between the outlet of the ejector channel and the horizontal axis is B, wherein A+B=10°-25°.

[0015] Furthermore, B>A.

[0016] Furthermore, an included angle C exists between the second conical annular surface 93 and the cylindrical plane 94 , wherein C=(3.1-6.3)A+(4.3-5.6)B.

[0017] Furthermore, the radius of the circular arc annular surface 92 is R1, R1 = (0.01-0.03)R, where R is the inlet radius of the impeller.

[0018] The invention discloses a diagonal flow fan with a guide vane structure. In a cross-sectional projection view through the central axis of the fan, the leading edge of the return outer shell guide vane 6 and the trailing edge of the return inner shell guide vane 7 have a projection overlap region, and the overlap region is a parallelogram. The flow surface of the inlet guide vane structure 9 includes a first conical annular surface 91, a circular arc annular surface 92, a second conical annular surface 93, and a cylindrical plane 94 in sequence. The center line of the cylindrical plane 94 is colinear with the central axis of the fan. The twisted guide vane 10 is installed on the inner wall surface of the second conical annular surface 93. The first guide vane 11 and the second guide vane 12 are in sequence. Installed on the inner wall of the cylindrical plane 94, the first guide vane 11 is located between the twisted guide vane 10 and the second guide vane 12, the first guide vane 11 and the second guide vane 12 are both straight plate guide vanes, in the axial projection view along the central axis of the fan, the projection of the twisted guide vane 10 and the projection of the second guide vane 12 are intersected, the projection of the leading edge 101 of the twisted guide vane and the projection of the inner edge 121 of the second guide vane are axially overlapped, the projection of the trailing edge 102 of the twisted guide vane and the projection of the outer edge 122 of the second guide vane are misaligned in the same circumferential direction, and the projection of the first guide vane 11 is located in the misaligned area. Due to the improvement of the guide vane structure of the diagonal flow fan, the flow characteristics are improved, the noise is reduced, and the conveying efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a diagonal flow fan;

[0020] Figure 2 It is a cross-sectional view of a diagonal flow fan;

[0021] Figure 3 is a structural schematic diagram of the inlet guide vane structure 9;

[0022] Figure 4It is a schematic diagram of the projection position relationship among the bent and twisted guide vane 10, the first guide vane 11, and the second guide vane 12 in the axial projection view along the central axis of the fan.

[0023] In the figure: motor 1, hub 2, blade 3, return inner shell 4, return outer shell 5, return outer shell guide vane 6, return inner shell guide vane 7, impeller cover ring 8, inlet guide vane structure 9, first conical annulus 91, arc annulus 92, second conical annulus 93, cylindrical plane 94, twisted guide vane 10, first guide vane 11, second guide vane 12, twisted guide vane leading edge 101, twisted guide vane trailing edge 102, second guide vane inner edge 121, second guide vane outer edge 122, radial height L of annular return channel, radial height L1 of return outer shell guide vane 6, radial height L2 of return inner shell guide vane 7, ejector flow channel 100, angle A between ejector flow channel inlet and vertical direction, angle B between ejector flow channel outlet and horizontal axis, angle C between second conical annulus 93 and cylindrical plane 94, radius R1 of arc annulus 92, inlet radius R of impeller. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] like Figure 1-4As shown, a diagonal flow fan with a guide vane structure comprises a motor 1, which is connected to a hub 2 and drives it to rotate, a blade 3 is mounted on the hub 2, and the outer edge of the blade 3 is fixed on the inner side of an impeller cover ring 8; it is characterized in that: a return inner shell 4, a return outer shell 5, and an inlet guide vane structure 9 constitute a volute air duct of the diagonal flow fan; one end of the inlet guide vane structure 9 is integrally connected with one end of the return outer shell 5, the return inner shell 4 and the return outer shell 5 form an annular return channel, one end of the return outer shell guide vane 6 is mounted on the inner wall of the return outer shell 5, and the other end is located in the annular return channel and is not connected to the outer wall of the return inner shell 4, one end of the return inner shell guide vane 7 is mounted on the outer wall of the return inner shell 4, and the other end is located in the annular return channel and is not connected to the outer wall of the return outer shell 5, in a cross-sectional projection view passing through the central axis of the fan, there is a projection overlap area between the leading edge of the return outer shell guide vane 6 and the trailing edge of the return inner shell guide vane 7, and the overlap area is a parallelogram The flow surface of the inlet guide vane structure 9 includes a first conical annular surface 91, an arc annular surface 92, a second conical annular surface 93, and a cylindrical plane 94 in sequence. The center line of the cylindrical plane 94 is colinear with the central axis of the fan. The bent and twisted guide vane 10 is installed on the inner wall surface of the second conical annular surface 93. The first guide vane 11 and the second guide vane 12 are installed on the inner wall surface of the cylindrical plane 94 in sequence. The first guide vane 11 is located between the bent and twisted guide vane 10 and the second guide vane 12. Both the first guide vane 11 and the second guide vane 12 are straight plate guide vanes. In the axial projection view along the central axis of the fan, the projection of the bent and twisted guide vane 10 and the projection of the second guide vane 12 are intersected. The projection of the leading edge 101 of the bent and twisted guide vane and the projection of the inner edge 121 of the second guide vane coincide in the axial direction. The projection of the trailing edge 102 of the bent and twisted guide vane and the projection of the outer edge 122 of the second guide vane are offset in the same circumferential direction. The projection of the first guide vane 11 is located in the offset area.

[0027] Further, the position of the intersection point of the projection of the twisted guide vane 10 and the projection of the second guide vane 12 is closer to the cylindrical plane 94 side.

[0028] Further, the radial height of the annular return channel is L, the radial height of the return outer casing guide vane 6 is L1, and the radial height of the return inner casing guide vane 7 is L2, wherein L1>L2.

[0029] Further, L1+L2=(1.1-1.5)L.

[0030] Further, L1 = (1.1-1.3) L2.

[0031] Furthermore, the projection position of the first guide vane 11 in the misaligned region is closer to the projection position of the trailing edge 102 of the twisted guide vane in the circumferential direction.

[0032] Furthermore, the inlet guide vane structure 9 has an ejection channel 100 , which is arc-shaped, with an ejection channel inlet located at the first conical annular surface 91 and an ejection channel outlet located at the second conical annular surface 93 .

[0033] Furthermore, in the airflow inlet direction, the angle between the inlet of the ejector channel and the vertical direction is A, and in the airflow outlet direction, the angle between the outlet of the ejector channel and the horizontal axis is B, wherein A+B=10°-25°.

[0034] Furthermore, B>A.

[0035] Furthermore, an included angle C exists between the second conical annular surface 93 and the cylindrical plane 94 , wherein C=(3.1-6.3)A+(4.3-5.6)B.

[0036] Furthermore, the radius of the circular arc annular surface 92 is R1, R1 = (0.01-0.03)R, where R is the inlet radius of the impeller.

[0037] The invention discloses a diagonal flow fan with a guide vane structure. In a cross-sectional projection view through the central axis of the fan, the leading edge of the return outer shell guide vane 6 and the trailing edge of the return inner shell guide vane 7 have a projection overlap region, and the overlap region is a parallelogram. The flow surface of the inlet guide vane structure 9 includes a first conical annular surface 91, a circular arc annular surface 92, a second conical annular surface 93, and a cylindrical plane 94 in sequence. The center line of the cylindrical plane 94 is colinear with the central axis of the fan. The twisted guide vane 10 is installed on the inner wall surface of the second conical annular surface 93. The first guide vane 11 and the second guide vane 12 are in sequence. Installed on the inner wall of the cylindrical plane 94, the first guide vane 11 is located between the twisted guide vane 10 and the second guide vane 12, the first guide vane 11 and the second guide vane 12 are both straight plate guide vanes, in the axial projection view along the central axis of the fan, the projection of the twisted guide vane 10 and the projection of the second guide vane 12 are intersected, the projection of the leading edge 101 of the twisted guide vane and the projection of the inner edge 121 of the second guide vane are axially overlapped, the projection of the trailing edge 102 of the twisted guide vane and the projection of the outer edge 122 of the second guide vane are misaligned in the same circumferential direction, and the projection of the first guide vane 11 is located in the misaligned area. Due to the improvement of the guide vane structure of the diagonal flow fan, the flow characteristics are improved, the noise is reduced, and the conveying efficiency is improved.

Claims

1. A diagonal flow fan with a guide vane structure, comprising a motor (1), the motor (1) being connected to a hub (2) and driving the hub (2) to rotate, a blade (3) being mounted on the hub (2), and an outer edge of the blade (3) being fixed to the inner side of an impeller cover ring (8); characterized in that: The return inner shell (4), the return outer shell (5), and the inlet guide vane structure (9) form a volute air duct of the oblique flow fan; one end of the inlet guide vane structure (9) is integrally connected to one end of the return outer shell (5), and the return inner shell (4) and the return outer shell (5) form an annular return channel; one end of the return outer shell guide vane (6) is installed on the inner wall of the return outer shell (5), and the other end is located in the annular return channel and is not connected to the outer wall of the return inner shell (4); one end of the return inner shell guide vane (7) is installed on the outer wall of the return inner shell (4), and the other end is located in the annular return channel and is not connected to the outer wall of the return outer shell (5); in the cross-sectional projection view passing through the central axis of the fan, the leading edge of the return outer shell guide vane (6) and the trailing edge of the return inner shell guide vane (7) have a projection overlap area, and the overlap area is a parallelogram; the flow surface of the inlet guide vane structure (9) includes a first conical annular surface (91), a circular arc annular surface (92), a second conical annular surface (93), and a second conical annular surface (94). The second conical annular surface (93) and the cylindrical plane (94) are colinear with the central axis of the fan. The bent and twisted guide vane (10) is installed on the inner wall surface of the second conical annular surface (93). The first guide vane (11) and the second guide vane (12) are installed on the inner wall surface of the cylindrical plane (94) in sequence. The first guide vane (11) is located between the bent and twisted guide vane (10) and the second guide vane (12). 2) are all straight plate-shaped guide vanes. In the axial projection view along the central axis of the fan, the projection of the twisted guide vane (10) and the projection of the second guide vane (12) intersect, the projection of the leading edge (101) of the twisted guide vane and the projection of the inner edge (121) of the second guide vane overlap in the axial direction, the projection of the trailing edge (102) of the twisted guide vane and the projection of the outer edge (122) of the second guide vane are offset in the same circumferential direction, and the projection of the first guide vane (11) is located in the offset area.

2. The diagonal flow fan with a guide vane structure according to claim 1, characterized in that: The position of the intersection point between the projection of the twisted guide vane (10) and the projection of the second guide vane (12) is closer to the cylindrical plane (94).

3. The diagonal flow fan with a guide vane structure according to claim 1, characterized in that: The radial height of the annular return channel is L, the radial height of the return outer casing guide vane (6) is L1, and the radial height of the return inner casing guide vane (7) is L2, wherein L1>L2.

4. The diagonal flow fan with a guide vane structure according to claim 3, characterized in that: L1+L2=(1.1-1.5)L.

5. The diagonal flow fan with a guide vane structure according to claim 3, characterized in that: L1 = (1.1-1.3) L2.

6. The diagonal flow fan with a guide vane structure according to claim 1, characterized in that: The projection position of the first guide vane (11) in the offset region is closer to the projection position of the trailing edge (102) of the twisted guide vane in the circumferential direction.

7. The diagonal flow fan with a guide vane structure according to claim 1, characterized in that: The inlet guide vane structure (9) has an ejection flow channel (100), the ejection flow channel (100) is arc-shaped, the ejection flow channel inlet is located on the first conical annular surface (91), and the ejection flow channel outlet is located on the second conical annular surface (93).

8. The diagonal flow fan with a guide vane structure according to claim 7, characterized in that: In the direction of airflow inlet, the angle between the inlet of the ejector channel and the vertical direction is A, and in the direction of airflow outlet, the angle between the outlet of the ejector channel and the horizontal axis is B, wherein A+B=10°-25°.

9. The diagonal flow fan with a guide vane structure according to claim 8, characterized in that: B>A.

10. The diagonal flow fan with a guide vane structure according to claim 9, characterized in that: An included angle C exists between the second conical annular surface (93) and the cylindrical plane (94), wherein C=(3.1-6.3)A+(4.3-5.6)B.

11. The diagonal flow fan with a guide vane structure according to claim 1, characterized in that: The radius of the circular arc annular surface (92) is R1, R1 = (0.01-0.03)R, wherein R is the inlet radius of the impeller.

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