Blade of oblique flow fan

Abstract

According to the blade of the oblique flow fan, the front end of an impeller ring is composed of an outer impeller ring and an inner impeller ring, and the blade comprises a blade tip jet flow noise reduction structure and a blade root pressure stabilizing noise reduction structure; the blade tip jet flow noise reduction structure comprises an impeller ring front end jet flow structure and an impeller ring rear end noise reduction structure. The blade root pressure stabilizing and noise reducing structure comprises a blade front edge noise reducing structure and a hub middle pressure stabilizing structure. As the blade structure of the oblique flow fan is improved, the flow characteristic is improved, the noise is reduced, and the conveying efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a blade of a diagonal flow fan, in particular to a blade structure which can improve flow guiding efficiency and reduce 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 utility model is to solve the shortcomings of the prior art, and to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A blade of a diagonal flow fan, comprising a blade 4, wherein 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 blade 4 comprises a blade tip jet at an air inlet, wherein 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 an axial outlet end and are connected to the rear end of the impeller ring 3; the blade 4 comprises a blade tip jet Noise reduction structure and blade root pressure 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 an arc-shaped groove extending along the horizontal axial direction of the blade 4. The impeller ring jet port 5 is connected to the inlet of the arc-shaped groove; 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 close to the trailing edge 42. At a certain distance, the noise reduction structure at the rear end of the impeller ring 3 includes a first vertical noise reduction section 101, an arc noise reduction section 102 and a second vertical noise reduction section 103, and the three sections are connected in sequence to form at the outlet of the blade 4; the blade root pressure stabilization 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, and the blade 4 leading edge noise reduction structure is a concave structure, which includes a horizontal section 91, an arc section 92 and a vertical section 93, and 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 vertical section 93 is connected in sequence. The tail end of the 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. The blade pressure stabilizing arc flow channel 83 is a groove that penetrates the blade, and the impeller ring jet channel 51 is connected to the blade pressure stabilizing arc flow channel 83 at the trailing edge 42.

[0007] Furthermore, the outer impeller ring 31 is a cylindrical ring structure, and the inner impeller ring 32 is a conical ring structure.

[0008] Furthermore, an angle A formed between the outer impeller ring 31 and the inner impeller ring 32 is 15°-20°.

[0009] 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=0.3R.

[0010] Furthermore, the included angle B between the hub voltage stabilizing direct current channel 82 and the horizontal axis is 60°.

[0011] Furthermore, the radius of the impeller air inlet is R, the width of the arc-shaped groove channel is L1, and L1=0.03R.

[0012] Furthermore, the width of the blade pressure-stabilizing arc flow channel 83 is L2, where L2=0.07R.

[0013] Further, L2=(2-5)L1.

[0014] 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=0.06R.

[0015] Furthermore, the radius of the arc segment 92 is R2, and the radius of the arc noise reduction segment 102 is R3, wherein R3=6R2.

[0016] The utility model discloses a blade of a diagonal flow fan, 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 an arc-shaped 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 arc-shaped 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 there is a certain distance from the trailing edge 42, the rear end noise reduction structure of the impeller ring 3 includes a first vertical 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 a vertical 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 vertical 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. 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

[0017] Figure 1 It is a structural schematic diagram of a diagonal flow fan;

[0018] Figure 2 It is a cross-sectional view of a diagonal flow fan;

[0019] Figure 3 It is a structural schematic diagram of the noise reduction structure of the leading edge of blade 4;

[0020] Figure 4 It is a schematic diagram of the structure of the noise reduction structure at the rear end of the impeller ring 3.

[0021] 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, vertical section 93, first vertical 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 arc 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

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1-4As shown, a blade of a diagonal flow fan includes a blade 4, which is mounted on a hub 2, and the hub 2 is connected to a motor 1, and 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 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 The jet noise reduction structure and the blade root pressure stabilization noise reduction structure; the tip jet noise reduction structure includes the front end jet structure of the impeller ring 3 and the rear end noise reduction structure of the impeller ring 3. The front end jet structure of the impeller ring 3 includes the impeller ring jet port 5 and the 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 an arc-shaped groove extending along the horizontal axial direction of the blade 4. The impeller ring jet port 5 is connected to the inlet of the arc-shaped groove; 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 connected to the trailing edge 4. 2 has a certain spacing, the noise reduction structure at the rear end of the impeller ring 3 includes a first vertical noise reduction section 101, an arc noise reduction section 102 and a second vertical noise reduction section 103, and the three sections are sequentially connected to form at the outlet of the blade 4; the blade root pressure stabilization 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 a concave structure, which includes a horizontal section 91, an arc section 92 and a vertical section 93, the three sections are sequentially connected, the inlet end of the horizontal section 91 is located on the leading edge 41 side, The tail end of the vertical 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. The blade pressure stabilizing arc flow channel 83 is a groove that penetrates the blade, and the impeller ring jet channel 51 is connected to the blade pressure stabilizing arc flow channel 83 at the trailing edge 42.

[0025] Furthermore, the outer impeller ring 31 is a cylindrical ring structure, and the inner impeller ring 32 is a conical ring structure.

[0026] Furthermore, an angle A formed between the outer impeller ring 31 and the inner impeller ring 32 is 15°-20°.

[0027] 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=0.3R.

[0028] Furthermore, the included angle B between the hub voltage stabilizing direct current channel 82 and the horizontal axis is 60°.

[0029] Furthermore, the radius of the impeller air inlet is R, the width of the arc-shaped groove channel is L1, and L1=0.03R.

[0030] Furthermore, the width of the blade pressure-stabilizing arc flow channel 83 is L2, where L2=0.07R.

[0031] Further, L2=(2-5)L1.

[0032] 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=0.06R.

[0033] Furthermore, the radius of the arc segment 92 is R2, and the radius of the arc noise reduction segment 102 is R3, wherein R3=6R2.

[0034] The utility model discloses a blade of a diagonal flow fan, 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 an arc-shaped 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 arc-shaped 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 there is a certain distance from the trailing edge 42, the rear end noise reduction structure of the impeller ring 3 includes a first vertical 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 a vertical 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 vertical 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. 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 blade of a diagonal flow fan, 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), the front end jet structure of the impeller ring (3) includes an impeller ring jet port (5) and an impeller ring jet channel (51), and the impeller ring jet port (51) is connected to the impeller ring. The flow 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 an arc-shaped groove channel extending along the horizontal axis of the blade (4); the impeller ring jet port (5) is connected to the inlet of the arc-shaped 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 is spaced a certain distance from the trailing edge (42); the impeller ring (3) rear end noise reduction structure comprises a first vertical noise reduction section (101), an arc noise reduction section (102) and a second vertical noise reduction section (103), and the three sections are connected in sequence to form a The blade root pressure stabilization and noise reduction structure comprises 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 comprises a horizontal section (91), an arc section (92) and a vertical 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. The tail end of the vertical section (93) is connected to the hub (2). The hub (2) middle pressure stabilization structure comprises a hub pressure stabilization structure. An inlet (81), a hub pressure-stabilizing direct current channel (82), and a blade pressure-stabilizing circular arc 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 circular arc 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 circular arc channel (83) is a groove that penetrates the blade; and the impeller ring jet channel (51) is connected to the blade pressure-stabilizing circular arc channel (83) at the trailing edge (42).

2. The blade of a diagonal flow fan according to 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. The blade of a diagonal flow fan according to claim 2, characterized in that: The included angle A formed between the outer impeller ring (31) and the inner impeller ring (32) is 15°-20°.

4. The blade of a diagonal flow fan according to 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 = 0.3R.

5. The blade of a diagonal flow fan 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 60°.

6. The blade of a diagonal flow fan according to claim 1, characterized in that: The radius of the impeller air inlet is R, and the width of the arc-shaped groove is L1, L1 = 0.03R.

7. The blade of a diagonal flow fan according to claim 6, characterized in that: The width of the blade pressure-stabilizing arc flow channel (83) is L2, where L2=0.07R.

8. The blade of a diagonal flow fan according to claim 1, characterized in that: L2 = (2-5) L1.

9. The blade of a diagonal flow fan 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=0.06R.

10. The blade of a diagonal flow fan 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=6R2.

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