A volute air duct of a diagonal flow fan

Abstract

A volute air duct of a diagonal flow fan, wherein an outer shell ring, an inner shell ring, and a volute pre-buffer structure constitute the volute air duct of the diagonal flow fan; the outer shell ring includes a first outer shell ring and a second outer shell ring, the inner shell ring includes a first inner shell ring and a second inner shell ring, an outer drainage structure is provided between the first outer shell ring and the second outer shell ring, an inner drainage structure is provided between the first inner shell ring and the second inner shell ring, the volute pre-buffer structure is a step-shaped buffer structure, the inner drainage guide vane is provided on one side of the inner drainage inlet channel and is only connected to the first inner shell ring, and the inner drainage guide vane includes an inner drainage guide vane circular arc section, an inner drainage guide vane plane section, and an inner drainage guide vane plane inclined section. Due to the improvement of the volute air duct 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 invention relates to a volute air duct of a diagonal flow fan, and in particular to a volute air duct of a diagonal flow fan which has the advantages of improving flow characteristics, reducing noise and improving conveying efficiency. Background Art

[0002] Diagonal flow fans are fluid machines that have multiple rotating blades arranged radially with the hub as the center, and blow air in multiple directions to the rotating blades while being rotated by a motor, etc., in order to promote heat dissipation in air-cooled heat exchangers such as electric fans or ventilation fans, or radiators or condensers of automobiles. 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 the characteristics of diagonal flow fans.

[0003] Prior art CN209743192U discloses a diagonal flow fan, wherein the diagonal flow impeller comprises a plurality of rotor blades extending radially outward from an axially open hub, and the rotor blades are surrounded by an oil slinger. The oil slinger has a flow cross section extending radially outward in the axial flow direction and pointing to the inner wall of the housing. The motor is inserted into the axially open hub of the diagonal flow impeller and is completely enclosed by the hub. The motor extends in the axial direction, i.e., along the rotor shaft, to a depression at the center of the shaft, so that the depression can be positioned closer to the diagonal flow impeller.

[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 volute air duct of a diagonal flow fan to solve the above-mentioned problems so as to improve the flow characteristics, reduce the impeller vibration 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 in the prior art and to propose a volute air duct of a diagonal flow fan.

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

[0007] A volute air duct of a diagonal flow fan, comprising a motor 1, wherein the motor 1 is connected to a hub 2 and drives the hub 2 to rotate, wherein an impeller comprises blades and an impeller cover ring 5, wherein the blades are unevenly arranged between the impeller cover ring 5 and the hub 2, and wherein the blades have a blade leading edge 3 and a blade trailing edge 4; wherein the outer shell ring, the inner shell ring, and the volute front buffer structure 6 constitute the volute air duct of the diagonal flow fan; wherein the outer shell ring comprises a first outer shell ring 7 and a second outer shell ring 8, wherein the inner shell ring comprises a first inner shell ring 9 and a second inner shell ring 10, and wherein the outer shell ring and the inner shell ring are arranged in parallel; wherein an external drainage structure is arranged between the first outer shell ring 7 and the second outer shell ring 8, wherein the external drainage structure comprises a first external drainage shell ring 11 and a second external drainage shell ring 12, wherein an external drainage angle A is formed between the second external drainage shell ring 12 and the second outer shell ring 8, and the external drainage structure is connected to the volute air duct through an external drainage inlet channel 16, and the external drainage inlet The inlet channel 16 is located between the first outer shell ring 7 and the second outer shell ring 8; an inner drainage structure is provided between the first inner shell ring 9 and the second inner shell ring 10, and the inner drainage structure includes an inner drainage shell ring 13, one end of the inner drainage shell ring 13 is welded to one end of the first inner shell ring 9, and an inner drainage angle B is formed between the inner drainage shell ring 13 and the first inner shell ring 9, and the inner drainage structure is connected to the volute air duct through the inner drainage inlet channel 17, and the inner drainage inlet channel 17 is located between the first inner shell ring 9 and the second inner shell ring 10; the outer drainage guide vane 14 is arranged on one side of the outer drainage inlet channel 16, and is connected to the first outer shell ring 7 and the first inner shell ring 9; the inner drainage guide vane 15 is arranged on one side of the inner drainage inlet channel 17, and is only connected to the first inner shell ring 9; the volute front buffer structure 6 is a step-shaped buffer structure, wherein A+B=120°-160°, B>100°.

[0008] Furthermore, the axial width of the outer flow inlet channel 16 is L1, the axial width of the inner flow inlet channel 17 is L2, and the radial height of the volute air duct between the outer shell ring and the inner shell ring is L3, wherein L3>L1+L2.

[0009] Further, L3=2L1+3L2, where L1>L2.

[0010] Furthermore, the inner flow guide vane 15 includes an inner flow guide vane arc section 151 , an inner flow guide vane plane section 152 , and an inner flow guide vane plane inclined section 153 .

[0011] Furthermore, the radius of the impeller is R, and the radius of the inner guide vane arc segment 151 is R1, wherein R1=(0.02-0.08)R.

[0012] Furthermore, the included angle between the inner guide vane plane inclined section 153 and the first inner casing ring 9 is C, C=(0.12-0.29)B.

[0013] Furthermore, the volute front buffer structure 6 includes a first right-angle buffer section 61 , a second right-angle buffer section 62 , an arc buffer section 63 , and a buffer oblique straight section 64 .

[0014] Furthermore, a tapered flow passage is formed between the buffer oblique straight section 64 and the impeller cover ring 5, and the gas passing through the flow passage will produce a jet effect.

[0015] Furthermore, the radial height of the first right-angle buffer section 61 is a first buffer height h1, and the radial height of the second right-angle buffer section 62 is a second buffer height h2, wherein h1>1.5h2.

[0016] Furthermore, the radius of the impeller is R, and R2 is the radius of the arc buffer section 63, wherein R2=(0.003-0.016)R.

[0017] The present invention discloses a volute air duct of a diagonal flow fan, wherein an outer shell ring, an inner shell ring, and a volute pre-buffer structure 6 constitute the volute air duct of the diagonal flow fan; the outer shell ring includes a first outer shell ring 7 and a second outer shell ring 8, the inner shell ring includes a first inner shell ring 9 and a second inner shell ring 10, an outer drainage structure is provided between the first outer shell ring 7 and the second outer shell ring 8, an inner drainage structure is provided between the first inner shell ring 9 and the second inner shell ring 10, the volute pre-buffer structure 6 is a step-shaped buffer structure, an inner drainage guide vane 15 is provided on one side of an inner drainage inlet channel 17, and is only connected to the first inner shell ring 9, and the inner drainage guide vane 15 includes an inner drainage guide vane circular arc section 151, an inner drainage guide vane plane section 152, and an inner drainage guide vane plane inclined section 15. Since the volute air duct of the diagonal flow fan is improved, the flow characteristics are improved, the noise is reduced, and the conveying efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a diagonal flow fan;

[0019] Figure 2 It is a cross-sectional view of a diagonal flow fan;

[0020] Figure 3 It is a structural schematic diagram of the inner drainage guide vane;

[0021] Figure 4 Schematic diagram of the volute front buffer structure.

[0022] In the figure: motor 1, hub 2, blade leading edge 3, blade trailing edge 4, impeller cover ring 5, volute front buffer structure 6, first right angle buffer section 61, second right angle buffer section 62, arc buffer section 63, buffer oblique straight section 64, first outer shell ring 7, second outer shell ring 8, first inner shell ring 9, second inner shell ring 10, first outer drainage shell ring 11, second outer drainage shell ring 12, inner drainage shell ring 13, outer drainage guide vane 14, inner drainage guide vane 15, inner drainage guide vane arc section 151, inner drainage guide vane plane section 152, inner drainage The guide vane plane inclined section 153, the outer drainage inlet channel 16, the inner drainage inlet channel 17, the impeller radius R, the outer drainage angle A, the inner drainage angle B, the radius R1 of the inner drainage guide vane arc section 151, the angle C between the inner drainage guide vane plane inclined section 153 and the first inner shell ring 9, the first buffer height h1, the second buffer height h2, the radius R2 of the arc buffer section 63, the axial width L1 of the outer drainage inlet channel 16, the axial width L2 of the inner drainage inlet channel 17, and the radial height L3 of the volute air duct between the outer shell ring and the inner shell ring; Figure 2 The middle arrows indicate the direction of air circulation. DETAILED DESCRIPTION

[0023] 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.

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] like Figure 1-4As shown, a volute air duct of a diagonal flow fan comprises a motor 1, which is connected to a hub 2 and drives it to rotate, an impeller comprises blades and an impeller cover ring 5, the blades are unevenly arranged between the impeller cover ring 5 and the hub 2, and the blades have a blade leading edge 3 and a blade trailing edge 4; it is characterized in that: an outer shell ring, an inner shell ring, and a volute front buffer structure 6 constitute the volute air duct of the diagonal flow fan; the outer shell ring comprises a first outer shell ring 7 and a second outer shell ring 8, the inner shell ring comprises a first inner shell ring 9 and a second inner shell ring 10, and the outer shell ring is arranged in parallel with the inner shell ring; an external drainage structure is provided between the first outer shell ring 7 and the second outer shell ring 8, the external drainage structure consists of a first outer drainage shell ring 11 and a second outer drainage shell ring 12, wherein an external drainage angle A is formed between the second outer drainage shell ring 12 and the second outer shell ring 8, the external drainage structure is connected to the volute air duct through an external drainage inlet channel 16, and the external drainage The inlet channel 16 is located between the first outer shell ring 7 and the second outer shell ring 8; an inner drainage structure is provided between the first inner shell ring 9 and the second inner shell ring 10, and the inner drainage structure includes an inner drainage shell ring 13, one end of the inner drainage shell ring 13 is welded to one end of the first inner shell ring 9, and an inner drainage angle B is formed between the inner drainage shell ring 13 and the first inner shell ring 9. The inner drainage structure is connected to the volute air duct through the inner drainage inlet channel 17, and the inner drainage inlet channel 17 is located between the first inner shell ring 9 and the second inner shell ring 10; the outer drainage guide vane 14 is arranged on one side of the outer drainage inlet channel 16, and is connected to the first outer shell ring 7 and the first inner shell ring 9; the inner drainage guide vane 15 is arranged on one side of the inner drainage inlet channel 17, and is only connected to the first inner shell ring 9; the volute front buffer structure 6 is a step-shaped buffer structure, wherein A+B=120°-160°, B>100°.

[0026] Furthermore, the axial width of the outer flow inlet channel 16 is L1, the axial width of the inner flow inlet channel 17 is L2, and the radial height of the volute air duct between the outer shell ring and the inner shell ring is L3, wherein L3>L1+L2.

[0027] Further, L3=2L1+3L2, where L1>L2.

[0028] Furthermore, the inner flow guide vane 15 includes an inner flow guide vane arc section 151 , an inner flow guide vane plane section 152 , and an inner flow guide vane plane inclined section 153 .

[0029] Furthermore, the radius of the impeller is R, and the radius of the inner guide vane arc segment 151 is R1, wherein R1=(0.02-0.08)R.

[0030] Furthermore, the included angle between the inner guide vane plane inclined section 153 and the first inner casing ring 9 is C, C=(0.12-0.29)B.

[0031] Furthermore, the volute front buffer structure 6 includes a first right-angle buffer section 61 , a second right-angle buffer section 62 , an arc buffer section 63 , and a buffer oblique straight section 64 .

[0032] Furthermore, a tapered flow passage is formed between the buffer oblique straight section 64 and the impeller cover ring 5, and the gas passing through the flow passage will produce a jet effect.

[0033] Furthermore, the radial height of the first right-angle buffer section 61 is a first buffer height h1, and the radial height of the second right-angle buffer section 62 is a second buffer height h2, wherein h1>1.5h2.

[0034] Furthermore, the radius of the impeller is R, and R2 is the radius of the arc buffer section 63, wherein R2=(0.003-0.016)R.

[0035] The present invention discloses a volute air duct of a diagonal flow fan, wherein an outer shell ring, an inner shell ring, and a volute pre-buffer structure 6 constitute the volute air duct of the diagonal flow fan; the outer shell ring includes a first outer shell ring 7 and a second outer shell ring 8, the inner shell ring includes a first inner shell ring 9 and a second inner shell ring 10, an outer drainage structure is provided between the first outer shell ring 7 and the second outer shell ring 8, an inner drainage structure is provided between the first inner shell ring 9 and the second inner shell ring 10, the volute pre-buffer structure 6 is a step-shaped buffer structure, an inner drainage guide vane 15 is provided on one side of an inner drainage inlet channel 17, and is only connected to the first inner shell ring 9, and the inner drainage guide vane 15 includes an inner drainage guide vane circular arc section 151, an inner drainage guide vane plane section 152, and an inner drainage guide vane plane inclined section 15. Since the volute air duct of the diagonal flow fan is improved, the flow characteristics are improved, the noise is reduced, and the conveying efficiency is improved.

Claims

1. A volute air duct of a diagonal flow fan, comprising a motor (1), the motor (1) being connected to a hub (2) and driving the hub to rotate, the impeller comprising blades and an impeller cover ring (5), the blades being unevenly arranged between the impeller cover ring (5) and the hub (2), the blades having a blade leading edge (3) and a blade trailing edge (4); characterized in that: An outer shell ring, an inner shell ring, and a volute front buffer structure (6) form a volute air duct of a diagonal flow fan; the outer shell ring comprises a first outer shell ring (7) and a second outer shell ring (8), and the inner shell ring comprises a first inner shell ring (9) and a second inner shell ring (10), and the outer shell ring and the inner shell ring are arranged in parallel; an external drainage structure is arranged between the first outer shell ring (7) and the second outer shell ring (8), and the external drainage structure is composed of a first external drainage shell ring (11) and a second external drainage shell ring (12), wherein an external drainage angle A is formed between the second external drainage shell ring (12) and the second outer shell ring (8), and the external drainage structure is connected to the volute air duct through an external drainage inlet channel (16), and the external drainage inlet channel (16) is located between the first outer shell ring (7) and the second outer shell ring (8); an internal drainage structure is arranged between the first inner shell ring (9) and the second inner shell ring (10). The invention relates to a structure in which the inner drainage structure comprises an inner drainage shell ring (13), one end of the inner drainage shell ring (13) is welded to one end of the first inner shell ring (9), an inner drainage angle B is formed between the inner drainage shell ring (13) and the first inner shell ring (9), the inner drainage structure is connected to the volute air duct through an inner drainage inlet channel (17), and the inner drainage inlet channel (17) is located between the first inner shell ring (9) and the second inner shell ring (10); the outer drainage guide vane (14) is arranged on one side of the outer drainage inlet channel (16) and is connected to the first outer shell ring (7) and the first inner shell ring (9); the inner drainage guide vane (15) is arranged on one side of the inner drainage inlet channel (17) and is only connected to the first inner shell ring (9); the volute front buffer structure (6) is a step-shaped buffer structure, wherein A+B=120°-160°, and B>100°.

2. The volute air duct of a diagonal flow fan according to claim 1, characterized in that: The axial width of the outer flow inlet channel (16) is L1, the axial width of the inner flow inlet channel (17) is L2, and the radial height of the volute air duct between the outer shell ring and the inner shell ring is L3, wherein L3>L1+L2.

3. The volute air duct of a diagonal flow fan according to claim 2, characterized in that: L3=2L1+3L2, where L1>L2.

4. The volute air duct of a diagonal flow fan according to claim 1, characterized in that: The inner flow guide vane (15) comprises an inner flow guide vane arc section (151), an inner flow guide vane plane section (152), and an inner flow guide vane plane inclined section (153).

5. The volute air duct of the diagonal flow fan according to claim 4, characterized in that: The radius of the impeller is R, and the radius of the inner guide vane arc segment (151) is R1, wherein R1=(0.02-0.08)R.

6. The volute air duct of the diagonal flow fan according to claim 4, characterized in that: The included angle between the inner guide vane plane inclined section (153) and the first inner shell ring (9) is C, where C=(0.12-0.29)B.

7. The volute air duct of a diagonal flow fan according to claim 1, characterized in that: The volute front buffer structure (6) comprises a first right-angle buffer section (61), a second right-angle buffer section (62), an arc buffer section (63), and a buffer oblique straight section (64).

8. The volute air duct of the diagonal flow fan according to claim 7, characterized in that: A gradually contracting flow channel is formed between the buffer oblique straight section (64) and the impeller cover ring (5), and a jet effect is produced when gas passes through the flow channel.

9. The volute air duct of a diagonal flow fan according to claim 7, characterized in that: The radial height of the first right-angle buffer section (61) is a first buffer height h1, and the radial height of the second right-angle buffer section (62) is a second buffer height h2, wherein h1>1.5h2.

10. The volute air duct of a diagonal flow fan according to claim 7, characterized in that: The radius of the impeller is R, and R2 is the radius of the arc buffer section (63), wherein R2=(0.003-0.016)R.

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