A centrifugal fan with double-layer cross blades

Abstract

The invention discloses a centrifugal fan with double-layer cross blades, wherein the upper blades (5) are two-section bent straight plate-shaped blades, and the lower blades (6) are arc-shaped curved blades, and the bending part of the upper blades (5) and the hub side of the lower blades (6) intersect axially on the outer edge side of the hub (9); the leading edge side of the upper blades (5) is provided with an upper winglet (10), and the trailing edge side of the lower blades (6) is provided with a lower winglet (11); the angle C between the upper winglet (10) and the leading edge of the upper blades (5) is 90°, and the lower winglet (11) is tangent to the trailing edge of the lower blades (6); the upper winglet (10) extends along the rotation direction of the blades, and the lower winglet (11) extends away from the rotation direction, and both the upper winglet (10) and the lower winglet (11) are straight plate-shaped blades; the upper blades (5) and the lower blades (6) are not in a one-to-one correspondence in number. The fan solves the limitations of existing designs, has strong adaptability, low power consumption, stable air volume, high heat dissipation efficiency and low noise.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation and heat dissipation, and in particular to a centrifugal fan with double-layer cross blades. Background Art

[0002] In daily life, the existing fan is mainly composed of a volute with an air inlet and an air outlet and an impeller assembly, wherein the impeller includes a hub and blades.

[0003] Prior art CN201486889U discloses a dual-channel fan, which is equipped with a movable partition and a fixed partition hinged at one end, and is equipped with an arc-shaped guide groove, so that the air outlet is divided into two upper and lower air ducts, and the movable partition can slide in the arc-shaped guide groove, so that the wind speed, air volume and wind direction of the upper and lower air ducts can be adjusted, thereby achieving a large air flow at the air outlet, uniform air flow, and excellent working performance. CN102878093A discloses a centrifugal fan, the proximal side of the blade is a backward-inclined blade structure, and the distal side is a forward-inclined blade structure, which can have the advantages of both forward-inclined blades and backward-inclined blades, and can improve the operation of the fan to enhance the heat dissipation effect and reduce the generation of noise.

[0004] However, the above-mentioned fans all have design limitations, poor adaptability, high power consumption, unstable air output, low heat dissipation efficiency and high noise. Therefore, in response to these problems, the applicant proposes a centrifugal fan with double-layer cross blades to solve the above-mentioned problems and 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 centrifugal fan with double-layer cross blades.

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

[0007] A centrifugal fan with double-layer cross blades, comprising an upper volute (1), a lower volute (2), an upper air inlet (3), a lower air inlet (4), upper blades (5), lower blades (6), an inner fairing ring (7), an outer fairing ring (8), a hub (9), an upper winglet (10), and a lower winglet (11); the upper blades (5) are two-section bent straight plate blades, the lower blades (6) are arc-shaped curved blades, the bending part of the upper blades (5) and the hub side of the lower blades (6) intersect axially on the outer edge side of the hub (9); the leading edge side of the upper blades (5) is provided with an upper winglet (10), and the lower blades (11) are provided with a plurality of winglets (11). 6) A lower winglet (11) is provided on the trailing edge side; wherein an angle A between the upper blade (5) and the lower blade (6) in the axial direction is 25-32°, an angle B at the bending portion of the upper blade (5) is 155-163°, an angle C between the upper winglet (10) and the leading edge of the upper blade (5) is 90°, and the lower winglet (11) is tangent to the trailing edge of the lower blade (6); the upper winglet (10) extends along the rotation direction of the blade, and the lower winglet (11) extends in the opposite direction of the rotation direction, and both the upper winglet (10) and the lower winglet (11) are straight plate-shaped blades; and the upper blades (5) and the lower blades (6) are not in a one-to-one correspondence in number.

[0008] Furthermore, the upper blades (5) include 29 blades, and lower blades (6) are arranged at the positions of the 1st, 3rd, 6th, 10th, 15th, 21st, 28th and 29th upper blades (5) along the rotation direction, while lower blades (6) are not arranged at the positions of the remaining upper blades (5).

[0009] Furthermore, the inner fairing ring (7) and the outer fairing ring (8) are both airfoil blades, the radius of the hub (9) is r, and the radius of the inner fairing ring (7) is R 1 , the radius of the outer rectifying ring (8) is R 2 , where R 1 +R 2 =1.2r.

[0010] Furthermore, the upper volute (1) and the lower volute (2) are fixed by means of upper and lower clamping, and the height of the upper volute (1) is H 1 , the height of the lower volute (2) is h 1 , H 1 =(1.3-1.5)h 1 .

[0011] Furthermore, the height of the upper blade (5) is H 2 , the height of the lower blade (6) is h 2 , H 2 =(1.2-1.5)h 2 .

[0012] Furthermore, the diameter of the upper air inlet (3) is D, the diameter of the lower air inlet (4) is d, and D=(1.5-1.6)d.

[0013] Furthermore, the upper blades (5) and the upper winglets (10) are integrally formed using rigid materials, and the lower blades (6) and the lower winglets (11) are integrally formed using flexible materials.

[0014] Furthermore, it also includes an AC motor, which is supported and installed in the lower volute (2) through a rolling bearing.

[0015] The present invention provides a centrifugal fan with double-layer cross-type blades. Due to the improvement of the structure of the centrifugal fan, the upper blades (5) are two-stage bent straight plate blades, the lower blades (6) are arc-shaped curved blades, the bending part of the upper blades (5) and the hub side of the lower blades (6) intersect axially on the outer edge side of the hub (9); the leading edge side of the upper blades (5) is provided with an upper winglet (10), and the trailing edge side of the lower blades (6) is provided with a lower winglet (11); wherein the axial angle A between the upper blades (5) and the lower blades (6) is 25-32°, and the upper blades (5) are The angle B at the bend is 155-163°, the angle C between the upper winglet (10) and the leading edge of the upper blade (5) is 90°, and the lower winglet (11) is tangent to the trailing edge of the lower blade (6); the upper winglet (10) extends along the rotation direction of the blade, and the lower winglet (11) extends away from the rotation direction, and both the upper winglet (10) and the lower winglet (11) are straight plate-shaped blades; the number of the upper blades (5) and the lower blades (6) is not one-to-one corresponding, which solves the limitations of the existing design, has strong adaptability, low power consumption, stable air output, high heat dissipation efficiency and low noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of an existing centrifugal fan;

[0017] Figure 2 A cross-sectional view of a centrifugal fan volute impeller of the present invention

[0018] Figure 3 It is a structural schematic diagram of the impeller of the present invention.

[0019] In the figure: an upper volute 1, a lower volute 2, an upper air inlet 3, a lower air inlet 4, an upper blade 5, a lower blade 6, an inner fairing ring 7, an outer fairing ring 8, a hub 9, an upper winglet 10, and a lower winglet 11. DETAILED DESCRIPTION

[0020] 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.

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] like Figure 1-3 As shown, a centrifugal fan with double-layer cross blades comprises an upper volute (1), a lower volute (2), an upper air inlet (3), a lower air inlet (4), upper blades (5), lower blades (6), an inner fairing ring (7), an outer fairing ring (8), a hub (9), an upper winglet (10), and a lower winglet (11); the upper blades (5) are two-section bent straight plate blades, the lower blades (6) are arc-shaped curved blades, the bending part of the upper blades (5) and the side of the hub of the lower blades (6) intersect axially on the outer edge side of the hub (9); the leading edge side of the upper blades (5) has an upper winglet (10), and the trailing edge side of the lower blades (6) has a lower winglet (11); wherein the axial angle A between the upper blades (5) and the lower blades (6) is 25-32°, and the angle B at the bending part of the upper blades (5) is 1 The invention discloses a volute air compressor comprising a plurality of winglets (10, 110, 120, 160, 170, 180, 190, 200, 210, 220, 230, 240, 260, 270, 280, 290, 300, 310, 320, 360, 370, 380, 390, 400, 410, 420, 480, 460, 470, 480, 490, 500, 510, 520, 530, 540, 560, 570, 580, 590, 600, 610, 610, 620, 640, 660, 670, 680, 690, 700, 710, 720, 730, 740, 760, 770, 780, 790, 800, 810, 810, 820, 830, 840, 860, 870, 890, 90 ...

[0023] Furthermore, the upper blades (5) include 29 blades, and lower blades (6) are arranged at the positions of the 1st, 3rd, 6th, 10th, 15th, 21st, 28th and 29th upper blades (5) along the rotation direction, while lower blades (6) are not arranged at the positions of the remaining upper blades (5).

[0024] Furthermore, the inner fairing ring (7) and the outer fairing ring (8) are both airfoil blades, the radius of the hub (9) is r, and the radius of the inner fairing ring (7) is R1 , the radius of the outer rectifying ring (8) is R 2 , where R 1 +R 2 =1.2r. The inner fairing ring (7) and the outer fairing ring (8) do not adopt a conventional ring structure but a unique airfoil structure, which effectively increases the steady-state margin and reduces noise.

[0025] Furthermore, the upper volute (1) and the lower volute (2) are fixed by means of upper and lower clamping, and the height of the upper volute (1) is H 1 , the height of the lower volute (2) is h 1 , H 1 =(1.3-1.5)h 1 .

[0026] Furthermore, the height of the upper blade (5) is H 2 , the height of the lower blade (6) is h 2 , H 2 =(1.2-1.5)h 2 .

[0027] Furthermore, the diameter of the upper air inlet (3) is D, the diameter of the lower air inlet (4) is d, and D=(1.5-1.6)d.

[0028] Furthermore, the upper blades (5) and the upper winglets (10) are integrally formed of rigid materials, and the lower blades (6) and the lower winglets (11) are integrally formed of flexible materials. The rigid setting of the upper blades effectively ensures the air volume, and the flexible setting of the lower blades effectively reduces noise and improves the air outlet effect.

[0029] Furthermore, it also includes an AC motor, which is supported and installed in the lower volute (2) through a rolling bearing.

[0030] In summary, due to the improvement of the structure of the centrifugal fan, the upper blade (5) is a two-section bent straight blade, the lower blade (6) is an arc-shaped curved blade, the bending part of the upper blade (5) and the hub side of the lower blade (6) intersect axially on the outer edge side of the hub (9); the leading edge side of the upper blade (5) has an upper winglet (10), and the trailing edge side of the lower blade (6) has a lower winglet (11); wherein the axial angle A between the upper blade (5) and the lower blade (6) is 25-32°, and the angle B at the bending part of the upper blade (5) is The invention relates to a winglet (10) having an angle of 155-163°, an angle C between an upper winglet (10) and a leading edge of an upper blade (5) being 90°, and a lower winglet (11) being tangent to a trailing edge of a lower blade (6); the upper winglet (10) extending along a rotation direction of the blade, and the lower winglet (11) extending opposite to the rotation direction, and both the upper winglet (10) and the lower winglet (11) being straight plate-shaped blades; and the number of the upper blades (5) and the lower blades (6) not being in a one-to-one correspondence relationship, thereby solving the limitations of the existing design, having strong adaptability, low power consumption, stable air output, high heat dissipation efficiency and low noise.

Claims

1. A centrifugal fan with double-layer cross blades, comprising an upper volute (1), a lower volute (2), an upper air inlet (3), a lower air inlet (4), upper blades (5), lower blades (6), an inner fairing ring (7), an outer fairing ring (8), a hub (9), an upper winglet (10), and a lower winglet (11); characterized in that: The upper blade (5) is a two-section bent straight blade, and the lower blade (6) is an arc-shaped curved blade. The bending part of the upper blade (5) and the hub side of the lower blade (6) intersect axially on the outer edge side of the hub (9); the leading edge side of the upper blade (5) is provided with an upper winglet (10), and the trailing edge side of the lower blade (6) is provided with a lower winglet (11); wherein the axial angle A between the upper blade (5) and the lower blade (6) is 25-32°, and the upper blade (5) The angle B at the bend is 155-163°, the angle C between the upper winglet (10) and the leading edge of the upper blade (5) is 90°, and the lower winglet (11) is tangent to the trailing edge of the lower blade (6); the upper winglet (10) extends along the rotation direction of the blade, and the lower winglet (11) extends in the opposite direction of the rotation direction. Both the upper winglet (10) and the lower winglet (11) are straight plate-shaped blades; the upper blades (5) and the lower blades (6) are not in a one-to-one correspondence in number.

2. A centrifugal fan with double-layer cross blades as claimed in claim 1, characterized in that: The upper blades (5) include 29 blades, and lower blades (6) are arranged at the positions of the 1st, 3rd, 6th, 10th, 15th, 21st, 28th and 29th upper blades (5) along the rotation direction, while no lower blades (6) are arranged at the positions of the remaining upper blades (5).

3. A centrifugal fan with double-layer cross blades as claimed in claim 2, characterized in that: The inner fairing ring (7) and the outer fairing ring (8) are both airfoil blades, the radius of the hub (9) is r, the radius of the inner fairing ring (7) is R1, and the radius of the outer fairing ring (8) is R2, wherein R1+R2=1.2r.

4. A centrifugal fan with double-layer cross blades as claimed in claim 3, characterized in that: The upper volute (1) and the lower volute (2) are fixed by means of upper and lower snap-fitting, the height of the upper volute (1) is H1, the height of the lower volute (2) is h1, and H1 = (1.3-1.5) h1.

5. A centrifugal fan with double-layer cross blades as claimed in claim 4, characterized in that: The height of the upper blade (5) is H2, and the height of the lower blade (6) is h2, H2 = (1.2-1.5) h2.

6. A centrifugal fan with double-layer cross blades as claimed in claim 5, characterized in that: The diameter of the upper air inlet (3) is D, and the diameter of the lower air inlet (4) is d, where D=(1.5-1.6)d.

7. A centrifugal fan with double-layer cross blades as claimed in claim 6, characterized in that: The upper blades (5) and the upper winglets (10) are integrally formed using rigid materials, and the lower blades (6) and the lower winglets (11) are integrally formed using flexible materials.

8. A centrifugal fan with double-layer cross blades as claimed in claim 7, characterized in that: It also includes an AC motor, which is supported and installed in the lower volute (2) through a rolling bearing.

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