A low wind noise diagonal flow fan blade

Abstract

The invention discloses a low wind noise diagonal flow fan blade, wherein the front end of the impeller ring is composed of an outer impeller ring and an inner impeller ring, and the blade includes a tip jet noise reduction structure and a blade root pressure stabilization noise reduction structure; the tip jet noise reduction structure includes a front end jet structure of the impeller ring and a rear end noise reduction structure of the impeller ring; the blade root pressure stabilization noise reduction structure includes a blade leading edge noise reduction structure and a hub middle pressure stabilization structure. Due to the improvement of the diagonal flow fan blade structure, the flow characteristics are improved, the noise is reduced, and the conveying efficiency is improved.

Description

Technical Field

[0001] The invention relates to a low-noise oblique-flow fan blade, and in particular to a blade structure capable of improving flow guidance 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 CN209041141U discloses an oblique flow fan, which adopts conical blades / body and motor housing / cover, with a taper between 50° and 60°, and a conical air guide cover is adopted from the front end of the blade to the entire air supply part, whose taper is 6° to 8° smaller than the taper of the blade, so that the air supply cross-sectional area between the two blades gradually becomes smaller in the whole process (the volume of air decreases after compression), so that the air flow keeps the flow velocity as consistent as possible when changing the flow direction, thereby generating a "siphon effect" at the front and rear ends of the blade, and minimizing the pressure difference between the two sides of the blade, thereby minimizing the driving resistance. At the same time, a directional air guide vane is further adopted at the air outlet end of the blade to guide the spiral airflow to axial direct current, thereby reducing the friction resistance between the airflow and the components after the air outlet, thereby exponentially improving the wind pressure and energy efficiency of the fan, and effectively reducing noise.

[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 blade 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 low wind noise diagonal flow fan blade

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

[0007] A low wind noise oblique flow fan blade, comprising a blade 4, the blade 4 is mounted on a hub 2, the hub 2 is connected to a motor 1, the motor 1 drives the hub 2 to rotate, and the outer edge of the blade 4 is fixed to the inner side of an impeller ring 3; the blade 4 comprises a leading edge 41 and a trailing edge 42, and there is a hub gap 8 between the hub 2 and the motor 1; the characteristic is that: at the air inlet, the front end of the impeller ring 3 is composed of an outer impeller ring 31 and an inner impeller ring 32, the outer impeller ring 31 and the inner impeller ring 32 extend in the axial direction and intersect at the axial outlet end and are connected to the rear end of the impeller ring 3; The blade 4 includes a blade tip jet noise reduction structure and a blade root pressure stabilization noise reduction structure; the blade tip jet noise reduction structure includes a front end jet structure of the impeller ring 3 and a rear end noise reduction structure of the impeller ring 3, the front end jet structure of the impeller ring 3 includes an impeller ring jet port 5 and an impeller ring jet channel 51, the impeller ring jet port 5 is located at the intersection of the axial outlet ends of the outer impeller ring 31 and the inner impeller ring 32, the impeller ring jet channel 51 is a straight groove channel extending along the horizontal axial direction of the blade 4, and the impeller ring jet port 5 is connected to the inlet of the straight groove channel; the rear end noise reduction structure of the impeller ring 3 is located at The inner side of the rear end of the impeller ring 3 is spaced a certain distance from the trailing edge 42. The noise reduction structure at the rear end of the impeller ring 3 includes a first oblique straight noise reduction section 101, an arc noise reduction section 102, and a second vertical noise reduction section 103. The three sections are sequentially connected to form the outlet of the blade 4. The blade root pressure stabilization noise reduction structure includes a leading edge noise reduction structure of the blade 4 and a middle part pressure stabilization structure of the hub 2. The leading edge noise reduction structure of the blade 4 is located on the side of the leading edge of the blade 4 close to the hub 2. The leading edge noise reduction structure of the blade 4 is a concave structure, which includes a horizontal section 91, an arc section 92, and an oblique straight section 93. The three sections They are connected in sequence, with the inlet end of the horizontal section 91 located on the leading edge 41 side, and the tail end of the inclined straight section 93 connected to the hub 2; the pressure stabilizing structure in the middle of the hub 2 includes a hub pressure stabilizing inlet 81, a hub pressure stabilizing direct current channel 82, and a blade pressure stabilizing arc flow channel 83. The hub pressure stabilizing direct current channel 82 obliquely penetrates the hub 2, and the hub pressure stabilizing inlet 81 is located on the side of the hub 2 close to the hub gap 8. One end of the blade pressure stabilizing arc flow channel 83 is connected to the hub pressure stabilizing direct current channel 82, and the other end is located at the trailing edge 42. The blade pressure stabilizing arc flow channel 83 is a groove that penetrates the blade.

[0008] Furthermore, the outer impeller ring 31 is a cylindrical ring structure, and the inner impeller ring 32 is a conical ring structure.

[0009] Furthermore, an included angle A formed between the outer impeller ring 31 and the inner impeller ring 32 is 20°-35°.

[0010] Furthermore, the radius of the impeller air inlet is R, and the radius of the blade pressure-stabilizing arc flow channel 83 is R1, wherein R1=(0.3-0.5)R.

[0011] Furthermore, the included angle B between the hub voltage stabilizing direct current channel 82 and the horizontal axis is 25°-65°.

[0012] Furthermore, the radius of the impeller air inlet is R, the width of the straight groove channel is L1, and L1 = (0.01-0.05)R.

[0013] Furthermore, the width of the blade pressure-stabilizing arc flow channel 83 is L2, where L2=(0.06-0.08)R.

[0014] Further, L2=(2-5)L1.

[0015] Furthermore, the radius of the impeller air inlet is R, and the distance between the second vertical noise reduction section 103 and the trailing edge 42 is L3, where L3=(0.02-0.07)R.

[0016] Furthermore, the radius of the arc segment 92 is R2, and the radius of the arc noise reduction segment 102 is R3, wherein R3=(3-9)R2.

[0017] The invention relates to a low-wind-noise oblique-flow fan blade, wherein the front end of the impeller ring 3 is composed of an outer impeller ring 31 and an inner impeller ring 32, and the blade 4 includes a blade tip jet noise reduction structure and a blade root voltage stabilizing noise reduction structure; the blade tip jet noise reduction structure includes a front end jet structure of the impeller ring 3 and a rear end noise reduction structure of the impeller ring 3, the front end jet structure of the impeller ring 3 includes an impeller ring jet port 5 and an impeller ring jet channel 51, the impeller ring jet port 5 is located at the intersection of the axial outlet ends of the outer impeller ring 31 and the inner impeller ring 32, the impeller ring jet channel 51 is a straight groove channel extending along the horizontal axis of the blade 4, and the impeller ring jet port 5 is connected to the inlet of the straight groove channel; the rear end noise reduction structure of the impeller ring 3 is located on the inner side of the rear end of the impeller ring 3, and is at a certain distance from the trailing edge 42, the rear end noise reduction structure of the impeller ring 3 includes a first oblique straight noise reduction section 101, an arc noise reduction section 102 and a second vertical noise reduction section 103, three sections They are connected in sequence to form at the outlet of the blade 4; the blade root pressure stabilizing and noise reduction structure includes a blade 4 leading edge noise reduction structure and a hub 2 middle pressure stabilizing structure, the blade 4 leading edge noise reduction structure is located on the side of the blade 4 leading edge close to the hub 2, the blade 4 leading edge noise reduction structure is a concave structure, which includes a horizontal section 91, an arc section 92 and an oblique straight section 93, the three sections are connected in sequence, the inlet end of the horizontal section 91 is located on the leading edge 41 side, and the tail end of the oblique straight section 93 is connected to the hub 2; the middle pressure stabilizing structure of the hub 2 includes a hub pressure stabilizing inlet 81, a hub pressure stabilizing direct current channel 82, and a blade pressure stabilizing arc flow channel 83, the hub pressure stabilizing direct current channel 82 obliquely penetrates the hub 2, the hub pressure stabilizing inlet 81 is located on the side of the hub 2 close to the hub gap 8, one end of the blade pressure stabilizing arc flow channel 83 is connected to the hub pressure stabilizing direct current channel 82, and the other end is located at the trailing edge 42, and the blade pressure stabilizing arc flow channel 83 is a groove that penetrates the blade. As the structure of the diagonal flow fan blades is improved, the flow characteristics are improved, the noise is reduced, and the conveying efficiency is increased. 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 noise reduction structure of the leading edge of blade 4;

[0021] Figure 4 It is a schematic diagram of the structure of the noise reduction structure at the rear end of the impeller ring 3.

[0022] In the figure: motor 1, hub 2, impeller ring 3, outer impeller ring 31, inner impeller ring 32, blade 4, leading edge 41, trailing edge 42, impeller ring jet port 5, impeller ring jet channel 51, hub gap 8, hub pressure stabilizing inlet 81, hub pressure stabilizing direct current channel 82, blade pressure stabilizing arc flow channel 83, horizontal section 91, arc section 92, oblique straight section 93, first oblique straight noise reduction section 101, arc noise reduction section 102, second vertical noise reduction section 103, the angle A between the outer impeller ring 31 and the inner impeller ring 32, the angle B between the hub pressure stabilizing direct current channel 82 and the horizontal axis, the radius R at the impeller air inlet, the radius R1 of the blade pressure stabilizing arc flow channel 83, the radius R2 of the arc segment 92, the radius R3 of the arc noise reduction segment 102, the width L1 of the straight groove channel, the width L2 of the blade pressure stabilizing arc flow channel 83, and the distance L3 between the second vertical noise reduction segment 103 and the trailing edge 42. 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 low wind noise oblique flow fan blade includes a blade 4, which is mounted on a hub 2, the hub 2 is connected to a motor 1, the motor 1 drives the hub 2 to rotate, and the outer edge of the blade 4 is fixed to the inner side of the impeller ring 3; the blade 4 includes a leading edge 41 and a trailing edge 42, and there is a hub gap 8 between the hub 2 and the motor 1; it is characterized in that: at the air inlet, the front end of the impeller ring 3 is composed of an outer impeller ring 31 and an inner impeller ring 32, the outer impeller ring 31 and the inner impeller ring 32 extend in the axial direction and intersect at the axial outlet end and are connected to the rear end of the impeller ring 3 The blade 4 includes a tip jet noise reduction structure and a blade root voltage stabilization noise reduction structure; the tip jet noise reduction structure includes a front end jet structure of the impeller ring 3 and a rear end noise reduction structure of the impeller ring 3, the front end jet structure of the impeller ring 3 includes an impeller ring jet port 5 and an impeller ring jet channel 51, the impeller ring jet port 5 is located at the intersection of the axial outlet ends of the outer impeller ring 31 and the inner impeller ring 32, the impeller ring jet channel 51 is a straight groove extending along the horizontal axial direction of the blade 4, and the impeller ring jet port 5 is connected to the inlet of the straight groove; the rear end noise reduction structure of the impeller ring 3 Located at the inner side of the rear end of the impeller ring 3, there is a certain distance from the trailing edge 42. The noise reduction structure at the rear end of the impeller ring 3 includes a first oblique straight noise reduction section 101, an arc noise reduction section 102 and a second vertical noise reduction section 103. The three sections are sequentially connected to form the outlet of the blade 4; the blade root pressure stabilizing noise reduction structure includes a leading edge noise reduction structure of the blade 4 and a middle part pressure stabilizing structure of the hub 2. The leading edge noise reduction structure of the blade 4 is located on the side of the leading edge of the blade 4 close to the hub 2. The leading edge noise reduction structure of the blade 4 is a concave structure, which includes a horizontal section 91, an arc section 92 and an oblique straight section 93. The three sections are connected in sequence to form the outlet of the blade 4. The sections are connected in sequence, the inlet end of the horizontal section 91 is located on the side of the leading edge 41, and the tail end of the inclined straight section 93 is connected to the hub 2; the pressure stabilizing structure in the middle of the hub 2 includes a hub pressure stabilizing inlet 81, a hub pressure stabilizing direct current channel 82, and a blade pressure stabilizing arc flow channel 83. The hub pressure stabilizing direct current channel 82 obliquely penetrates the hub 2, the hub pressure stabilizing inlet 81 is located on the side of the hub 2 close to the hub gap 8, one end of the blade pressure stabilizing arc flow channel 83 is connected to the hub pressure stabilizing direct current channel 82, and the other end is located at the trailing edge 42, and the blade pressure stabilizing arc flow channel 83 is a groove that penetrates the blade.

[0026] Furthermore, the outer impeller ring 31 is a cylindrical ring structure, and the inner impeller ring 32 is a conical ring structure.

[0027] Furthermore, an included angle A formed between the outer impeller ring 31 and the inner impeller ring 32 is 20°-35°.

[0028] Furthermore, the radius of the impeller air inlet is R, and the radius of the blade pressure-stabilizing arc flow channel 83 is R1, wherein R1=(0.3-0.5)R.

[0029] Furthermore, the included angle B between the hub voltage stabilizing direct current channel 82 and the horizontal axis is 25°-65°.

[0030] Furthermore, the radius of the impeller air inlet is R, the width of the straight groove channel is L1, and L1 = (0.01-0.05)R.

[0031] Furthermore, the width of the blade pressure-stabilizing arc flow channel 83 is L2, where L2=(0.06-0.08)R.

[0032] Further, L2=(2-5)L1.

[0033] Furthermore, the radius of the impeller air inlet is R, and the distance between the second vertical noise reduction section 103 and the trailing edge 42 is L3, where L3=(0.02-0.07)R.

[0034] Furthermore, the radius of the arc segment 92 is R2, and the radius of the arc noise reduction segment 102 is R3, wherein R3=(3-9)R2.

[0035] The invention relates to a low-wind-noise oblique-flow fan blade, wherein the front end of the impeller ring 3 is composed of an outer impeller ring 31 and an inner impeller ring 32, and the blade 4 includes a blade tip jet noise reduction structure and a blade root voltage stabilizing noise reduction structure; the blade tip jet noise reduction structure includes a front end jet structure of the impeller ring 3 and a rear end noise reduction structure of the impeller ring 3, the front end jet structure of the impeller ring 3 includes an impeller ring jet port 5 and an impeller ring jet channel 51, the impeller ring jet port 5 is located at the intersection of the axial outlet ends of the outer impeller ring 31 and the inner impeller ring 32, the impeller ring jet channel 51 is a straight groove channel extending along the horizontal axis of the blade 4, and the impeller ring jet port 5 is connected to the inlet of the straight groove channel; the rear end noise reduction structure of the impeller ring 3 is located on the inner side of the rear end of the impeller ring 3, and is at a certain distance from the trailing edge 42, the rear end noise reduction structure of the impeller ring 3 includes a first oblique straight noise reduction section 101, an arc noise reduction section 102 and a second vertical noise reduction section 103, three sections They are connected in sequence to form at the outlet of the blade 4; the blade root pressure stabilizing and noise reduction structure includes a blade 4 leading edge noise reduction structure and a hub 2 middle pressure stabilizing structure, the blade 4 leading edge noise reduction structure is located on the side of the blade 4 leading edge close to the hub 2, the blade 4 leading edge noise reduction structure is a concave structure, which includes a horizontal section 91, an arc section 92 and an oblique straight section 93, the three sections are connected in sequence, the inlet end of the horizontal section 91 is located on the leading edge 41 side, and the tail end of the oblique straight section 93 is connected to the hub 2; the middle pressure stabilizing structure of the hub 2 includes a hub pressure stabilizing inlet 81, a hub pressure stabilizing direct current channel 82, and a blade pressure stabilizing arc flow channel 83, the hub pressure stabilizing direct current channel 82 obliquely penetrates the hub 2, the hub pressure stabilizing inlet 81 is located on the side of the hub 2 close to the hub gap 8, one end of the blade pressure stabilizing arc flow channel 83 is connected to the hub pressure stabilizing direct current channel 82, and the other end is located at the trailing edge 42, and the blade pressure stabilizing arc flow channel 83 is a groove that penetrates the blade. As the structure of the diagonal flow fan blades is improved, the flow characteristics are improved, the noise is reduced, and the conveying efficiency is increased.

Claims

1. A low wind noise oblique flow fan blade, comprising a blade (4), the blade (4) being mounted on a hub (2), the hub (2) being connected to a motor (1), the motor (1) driving the hub (2) to rotate, the outer edge of the blade (4) being fixed on the inner side of an impeller ring (3); the blade (4) comprising a leading edge (41) and a trailing edge (42), and a hub gap (8) being present between the hub (2) and the motor (1); characterized in that: At the air inlet, the front end of the impeller ring (3) is composed of an outer impeller ring (31) and an inner impeller ring (32), the outer impeller ring (31) and the inner impeller ring (32) extend axially and intersect at the axial outlet end and are connected to the rear end of the impeller ring (3); the blade (4) includes a blade tip jet noise reduction structure and a blade root pressure stabilization noise reduction structure; the blade tip jet noise reduction structure includes a front end jet structure of the impeller ring (3) and a rear end noise reduction structure of the impeller ring (3), and the front end jet structure of the impeller ring (3) includes an impeller ring jet port (5) and an impeller ring jet channel ( 51), the impeller ring jet port (5) is located at the intersection of the axial outlet ends of the outer impeller ring (31) and the inner impeller ring (32), the impeller ring jet channel (51) is a straight groove channel extending along the horizontal axial direction of the blade (4), and the impeller ring jet port (5) is connected to the inlet of the straight groove channel; the impeller ring (3) rear end noise reduction structure is located on the inner side of the rear end of the impeller ring (3) and has a certain distance from the trailing edge (42), and the impeller ring (3) rear end noise reduction structure includes a first oblique straight noise reduction section (101), a circular arc noise reduction section (102) and a second vertical A straight noise reduction section (103), three sections are connected in sequence to form at the outlet of the blade (4); the blade root pressure stabilization and noise reduction structure includes a blade (4) leading edge noise reduction structure and a hub (2) middle pressure stabilization structure, the blade (4) leading edge noise reduction structure is located on the side of the blade (4) leading edge close to the hub (2), the blade (4) leading edge noise reduction structure is an inwardly concave structure, and includes a horizontal section (91), an arc section (92) and an oblique straight section (93), the three sections are connected in sequence, the inlet end of the horizontal section (91) is located on the leading edge (41) side, and the tail end of the oblique straight section (93) is located on the oblique straight section (93). The hub (2) is connected to the hub (2); the central pressure stabilizing structure of the hub (2) comprises a hub pressure stabilizing inlet (81), a hub pressure stabilizing direct current channel (82), and a blade pressure stabilizing arc flow channel (83); the hub pressure stabilizing direct current channel (82) obliquely penetrates the hub (2); the hub pressure stabilizing inlet (81) is located on a side of the hub (2) close to the hub gap (8); one end of the blade pressure stabilizing arc flow channel (83) is connected to the hub pressure stabilizing direct current channel (82), and the other end is located at the trailing edge (42); the blade pressure stabilizing arc flow channel (83) is a groove that penetrates the blade.

2. A low wind noise diagonal flow fan blade as claimed in claim 1, characterized in that: The outer impeller ring (31) is a cylindrical ring structure, and the inner impeller ring (32) is a conical ring structure.

3. A low wind noise diagonal flow fan blade as claimed in claim 2, characterized in that: The included angle A formed between the outer impeller ring (31) and the inner impeller ring (32) is 20°-35°.

4. A low wind noise diagonal flow fan blade as claimed in claim 1, characterized in that: The radius of the impeller air inlet is R, and the radius of the blade pressure stabilizing arc flow channel (83) is R1, wherein R1 = (0.3-0.5)R.

5. The low wind noise diagonal flow fan blade according to claim 1, characterized in that: The included angle B between the hub voltage-stabilizing direct current channel (82) and the horizontal axis is 25°-65°.

6. A low wind noise diagonal flow fan blade as claimed in claim 1, characterized in that: The radius of the impeller air inlet is R, and the width of the straight groove channel is L1, L1 = (0.01-0.05)R.

7. A low wind noise diagonal flow fan blade as claimed in claim 6, characterized in that: The width of the blade pressure-stabilizing arc flow channel (83) is L2, where L2=(0.06-0.08)R.

8. A low wind noise diagonal flow fan blade as claimed in claim 7, characterized in that: L2 = (2-5) L1.

9. The low wind noise diagonal flow fan blade according to claim 1, characterized in that: The radius of the impeller air inlet is R, and the distance between the second vertical noise reduction section (103) and the trailing edge (42) is L3, where L3 = (0.02-0.07)R.

10. The low wind noise diagonal flow fan blade according to claim 1, characterized in that: The radius of the circular arc segment (92) is R2, and the radius of the circular arc noise reduction segment (102) is R3, wherein R3=(3-9)R2.

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