A centrifugal fan impeller with combined blades

Abstract

A centrifugal fan impeller with combined blades, wherein the blades are composed of blade groups; the blade groups include backward curved blades and forward inclined blades, and there are inner blade group guide vanes between the backward curved blades and the forward inclined blades, and there are inter-blade group guide vanes between adjacent blade groups; the inner blade group guide vanes include the first guide vanes in the blade group and the second guide vanes in the blade group, and the first guide vanes in the blade group and the second guide vanes in the blade group are both arc-shaped blades, and the inter-blade group guide vanes include the first guide vanes between the blade groups and the second guide vanes between the blade groups, and the first guide vanes between the blade groups and the second guide vanes between the blade groups are both straight blades; the inner blade group guide vanes are located at the outlet of the blade flow channel, and the inter-blade group guide vanes are located at the inlet of the blade flow channel. Due to the improvement of the centrifugal fan impeller, the flow characteristics are improved, the noise is reduced, and the conveying efficiency is improved.

Description

Technical Field

[0001] The invention relates to a centrifugal fan impeller with combined blades, in particular to a centrifugal fan impeller with blade groups, inter-group guide vanes and intra-group guide vanes. Background Art

[0002] The centrifugal impeller is driven by a motor and usually includes an upper cover plate, a lower cover plate, blades, and a hub. Multiple blades are evenly distributed along the circumference and connected between the upper cover plate and the lower cover plate. A hub is provided on the inner circumference of the lower cover plate, and splitter blades are provided between the blades. The splitter blades are usually equal-thickness arc blades or three-dimensional twisted blades.

[0003] Prior art CN104279184A discloses a forward-inclined fan structure for a small-power synchronous generator, including a fan support disk, an axial hole, a fan negative pressure protection disk and blades, wherein the blades are arc-shaped and are vertically and evenly arranged on the outer circumference of the fan support disk; the fan negative pressure protection disk is annular and is arranged on the other side of the blade relative to the fan support disk, and the central axis of the fan negative pressure protection disk and the fan support disk coincide; the axial hole is arranged at the center of the fan support disk. The wind pressure and air flow per unit time inside the small-power synchronous generator are increased, the heat dissipation capacity of the motor is improved, and the influence of the decrease in the power generation voltage and output power caused by heat generation is reduced.

[0004] However, the above-mentioned fans all have design limitations, poor adaptability, large eddy current losses, 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 centrifugal fan impeller with combined blades to solve the above-mentioned problems so as to improve the flow characteristics, reduce 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 centrifugal fan impeller with combined blades.

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

[0007] A centrifugal fan impeller with combined blades, comprising a hub 1, an upper cover plate 2, a lower cover plate 3, and blades; characterized in that: the blades are composed of a blade group 4; the blade group 4 includes a backward-curved blade 41 and a forward-inclined blade 42, and there is an inner guide vane 5 of the blade group between the backward-curved blade 41 and the forward-inclined blade 42, and there is an inter-blade-group guide vane 6 between adjacent blade groups 4; the inner guide vane 5 of the blade group includes a first inner guide vane 51 of the blade group and a second inner guide vane 52 of the blade group, both the first inner guide vane 51 of the blade group and the second inner guide vane 52 of the blade group are arc-shaped blades, the inter-blade-group guide vane 6 includes a first inter-blade-group guide vane 61 and a second inter-blade-group guide vane 62, and both the first inter-blade-group guide vane 61 and the second inter-blade-group guide vane 62 are straight plate blades; the inner guide vane 5 of the blade group is located at the outlet of the blade flow passage, and the inter-blade-group guide vane 6 is located at the inlet of the blade flow passage; a first guide vane through hole 511 is provided on the first inner guide vane 51 of the blade group, and a second guide vane through hole 522 is provided on the second inner guide vane 52 of the blade group, and the first guide vane through hole 511 and the second guide vane through hole 522 are inclined with respect to the same radius line, and the inclination angles are equal; the outlet setting angle of the backward-curved blade 41 is the blade backward-curving angle A, and the outlet setting angle of the forward-inclined blade 42 is the blade forward-inclination angle B, where 108° < A + B < 156°; the impeller radius is R, the radius of the first inner guide vane 51 of the blade group is R51, and the radius of the second inner guide vane 52 of the blade group is R52, where R51 > R52.

[0008] Further, R51:R52 = 1.2 - 2.6.

[0009] Further, A = 30°, B = 98°.

[0010] Further, the inner diameter of the hole of the first guide vane through hole 511 is the same as the inner diameter of the hole of the second guide vane through hole 522, and the size is 0.02R - 0.06R.

[0011] Further, the included angle between the first inter-blade-group guide vane 61 and the second inter-blade-group guide vane 62 is C, and the value range of C is 0.25(A + B) - 0.56(A + B).

[0012] Further, the outlet height of the impeller is H, and the outlet height of the inner guide vane 5 of the blade group is H1, where H1 = (0.3 - 0.5)H.

[0013] Further, the outlet height of the inter-blade-group guide vane 6 is H2, where H2 = (0.5 - 0.66)H.

[0014] Further, H2 = 1.5H1.

[0015] Further, the distance from the radial inner side of the inner guide vane 5 of the blade group to the center of the impeller is the front-end radius R1 of the inner guide vane of the blade group, R1 = (0.6 - 0.88)R, and the radial outer side of the inner guide vane 5 of the blade group is flush with the outlet end of the lower cover plate 3.

[0016] Furthermore, the radial inner distance from the guide vane 6 between the blade groups to the center of the impeller is the front end radius R2 of the guide vane between the blade groups, and the radial outer distance from the guide vane 6 between the blade groups to the center of the impeller is the rear end radius R3 of the guide vane between the blade groups, wherein R2 = (0.2-0.33)R, R3 = (0.55-0.69)R.

[0017] The present invention discloses a centrifugal fan impeller with combined blades, wherein the blades are composed of a blade group 4; the blade group 4 includes a backward curved blade 41 and a forward inclined blade 42, and a blade group inner guide vane 5 is provided between the backward curved blade 41 and the forward inclined blade 42, and an inter-blade group guide vane 6 is provided between adjacent blade groups 4; the blade group inner guide vane 5 includes a first blade group inner guide vane 51 and a second blade group inner guide vane 52, and the first blade group inner guide vane 51 and the second blade group inner guide vane 52 are both arc-shaped blades, and the inter-blade group guide vane 6 includes a blade group inner guide vane 51 and a second blade group inner guide vane 52, and the first blade group inner guide vane 51 and the second blade group inner guide vane 52 are ... The first guide vane 61 between the blade groups and the second guide vane 62 between the blade groups are straight blades; the guide vane 5 in the blade group is located at the outlet of the blade flow channel, and the guide vane 6 between the blade groups is located at the inlet of the blade flow channel; the first guide vane 51 in the blade group is provided with a first guide vane through hole 511, and the second guide vane 52 in the blade group is provided with a second guide vane through hole 522, and the first guide vane through hole 511 and the second guide vane through hole 522 are inclined relative to the same radius line, and the inclination angles are equal. Due to the improvement of the centrifugal fan impeller, 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 schematic diagram of the cross-sectional structure of a centrifugal fan impeller with combined blades;

[0019] Figure 2 It is a top view of the structure of a centrifugal fan impeller with combined blades without the upper cover plate;

[0020] Figure 3 It is a schematic diagram of the structure of the guide vane 5 in the blade group;

[0021] Figure 4 It is a schematic diagram of the structure of the guide vane 6 between the blade groups.

[0022] In the figure: hub 1, upper cover plate 2, lower cover plate 3, blade group 4, backward curved blade 41, forward inclined blade 42, guide vane 5 in blade group, first guide vane 51 in blade group, second guide vane 52 in blade group, first guide vane through hole 511, second guide vane through hole 522, guide vane 6 between blade groups, first guide vane 61 between blade groups, second guide vane 62 between blade groups, backward curved blade angle A, forward inclined blade angle B, guide vane angle C between blade groups, impeller radius R, first guide vane radius R51 in blade group, second guide vane radius R52 in blade group, impeller outlet height H, guide vane outlet height H1 in blade group, guide vane outlet height H2 between blade groups, front end radius R1 of guide vane in blade group, front end radius R2 of guide vane between blade groups, rear end radius R3 of guide vane between blade groups; Figure 2 The middle arrow indicates the direction of rotation; Figure 3 , Figure 4 The middle arrows indicate the gas flow direction. 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 in the figure, a centrifugal fan impeller with combined blades includes a hub 1, an upper cover plate 2, a lower cover plate 3, and blades. It is characterized in that the blades are composed of blade groups 4; the blade group 4 includes backward-curved blades 41 and forward-inclined blades 42, and there is an inner guide vane 5 of the blade group between the backward-curved blades 41 and the forward-inclined blades 42, and there is an inter-blade-group guide vane 6 between adjacent blade groups 4; the inner guide vane 5 of the blade group includes a first inner guide vane 51 and a second inner guide vane 52 of the blade group, both the first inner guide vane 51 and the second inner guide vane 52 of the blade group are arc-shaped blades, the inter-blade-group guide vane 6 includes a first inter-blade-group guide vane 61 and a second inter-blade-group guide vane 62, and both the first inter-blade-group guide vane 61 and the second inter-blade-group guide vane 62 are straight plate blades; the inner guide vane 5 of the blade group is located at the outlet of the blade flow channel, and the inter-blade-group guide vane 6 is located at the inlet of the blade flow channel; a first guide vane through-hole 511 is provided on the first inner guide vane 51 of the blade group, a second guide vane through-hole 522 is provided on the second inner guide vane 52 of the blade group, and the first guide vane through-hole 511 and the second guide vane through-hole 522 are inclined with respect to the same radius line, and the inclination angles are equal; the outlet setting angle of the backward-curved blade 41 is the blade backward-curved angle A, and the outlet setting angle of the forward-inclined blade 42 is the blade forward-inclination angle B, where 108° < A + B < 156°; the radius of the impeller is R, the radius of the first inner guide vane 51 of the blade group is R51, and the radius of the second inner guide vane 52 of the blade group is R52, where R51 > R52.

[0026] Further, R51:R52 = 1.2 - 2.6.

[0027] Further, A = 30°, B = 98°.

[0028] Further, the inner diameter of the hole of the first guide vane through-hole 511 and the inner diameter of the hole of the second guide vane through-hole 522 are the same, and the size is 0.02R - 0.06R.

[0029] Further, the included angle between the first inter-blade-group guide vane 61 and the second inter-blade-group guide vane 62 is C, and the value range of C is 0.25(A + B) - 0.56(A + B).

[0030] Further, the outlet height of the impeller is H, and the outlet height of the inner guide vane 5 of the blade group is H1, where H1 = (0.3 - 0.5)H.

[0031] Further, the outlet height of the inter-blade-group guide vane 6 is H2, where H2 = (0.5 - 0.66)H.

[0032] Further, H2 = 1.5H1.

[0033] Further, the distance from the radial inner side of the inner guide vane 5 of the blade group to the center of the impeller is the front-end radius R1 of the inner guide vane of the blade group, R1 = (0.6 - 0.88)R, and the radial outer side of the inner guide vane 5 of the blade group is flush with the outlet end of the lower cover plate 3.

[0034] Furthermore, the radial inner distance from the guide vane 6 between the blade groups to the center of the impeller is the front end radius R2 of the guide vane between the blade groups, and the radial outer distance from the guide vane 6 between the blade groups to the center of the impeller is the rear end radius R3 of the guide vane between the blade groups, wherein R2 = (0.2-0.33)R, R3 = (0.55-0.69)R.

[0035] The present invention discloses a centrifugal fan impeller with combined blades, wherein the blades are composed of a blade group 4; the blade group 4 includes a backward curved blade 41 and a forward inclined blade 42, and a blade group inner guide vane 5 is provided between the backward curved blade 41 and the forward inclined blade 42, and an inter-blade group guide vane 6 is provided between adjacent blade groups 4; the blade group inner guide vane 5 includes a first blade group inner guide vane 51 and a second blade group inner guide vane 52, and the first blade group inner guide vane 51 and the second blade group inner guide vane 52 are both arc-shaped blades, and the inter-blade group guide vane 6 includes a blade group inner guide vane 51 and a second blade group inner guide vane 52, and the first blade group inner guide vane 51 and the second blade group inner guide vane 52 are ... The first guide vane 61 between the blade groups and the second guide vane 62 between the blade groups are straight blades; the guide vane 5 in the blade group is located at the outlet of the blade flow channel, and the guide vane 6 between the blade groups is located at the inlet of the blade flow channel; the first guide vane 51 in the blade group is provided with a first guide vane through hole 511, and the second guide vane 52 in the blade group is provided with a second guide vane through hole 522, and the first guide vane through hole 511 and the second guide vane through hole 522 are inclined relative to the same radius line, and the inclination angles are equal. Due to the improvement of the centrifugal fan impeller, the flow characteristics are improved, the noise is reduced, and the conveying efficiency is improved.

Claims

1. A centrifugal fan impeller with combined blades, comprising a hub (1), an upper cover plate (2), a lower cover plate (3), and blades; characterized in that: The blade is composed of a blade group (4); the blade group (4) includes backward-curved blades (41) and forward-inclined blades (42), there is an inner guide vane (5) of the blade group between the backward-curved blades (41) and the forward-inclined blades (42), and there is an inter-blade-group guide vane (6) between adjacent blade groups (4); the inner guide vane (5) of the blade group includes a first inner guide vane (51) of the blade group and a second inner guide vane (52) of the blade group. Both the first inner guide vane (51) of the blade group and the second inner guide vane (52) of the blade group are arc-shaped blades. The inter-blade-group guide vane (6) includes a first inter-blade-group guide vane (61) and a second inter-blade-group guide vane (62). Both the first inter-blade-group guide vane (61) and the second inter-blade-group guide vane (62) are straight plate blades; the inner guide vane (5) of the blade group is located at the outlet of the blade flow channel, and the inter-blade-group guide vane (6) is located at the inlet of the blade flow channel; a first guide vane through-hole (511) is provided on the first inner guide vane (51) of the blade group, and a second guide vane through-hole (522) is provided on the second inner guide vane (52) of the blade group. The first guide vane through-hole (511) and the second guide vane through-hole (522) are inclined with respect to the same radius line, and the inclination angles are equal; the outlet setting angle of the backward-curved blade (41) is the blade backward-curving angle A, and the outlet setting angle of the forward-inclined blade (42) is the blade forward-inclination angle B, where 108° < A + B < 156°; the impeller radius is R, the radius of the first inner guide vane (51) of the blade group is R51, and the radius of the second inner guide vane (52) of the blade group is R52, where R51 > R52.

2. A centrifugal fan impeller with combined blades as claimed in claim 1, characterized in that: R51:R52 = 1.2 - 2.

6.

3. A centrifugal fan impeller with combined blades as claimed in claim 1, characterized in that: A = 30°, B = 98°.

4. A centrifugal fan impeller with combined blades as claimed in claim 1, characterized in that: The inner diameter of the hole of the first guide vane through-hole (511) is the same as the inner diameter of the hole of the second guide vane through-hole (522), and the size is 0.02R - 0.06R.

5. A centrifugal fan impeller with combined blades as claimed in claim 1, characterized in that: The included angle between the first inter-blade-group guide vane (61) and the second inter-blade-group guide vane (62) is C, and the value range of C is 0.25(A + B) - 0.56(A + B).

6. A centrifugal fan impeller with combined blades as claimed in claim 1, characterized in that: The outlet height of the impeller is H, and the outlet height of the inner guide vane (5) of the blade group is H1, where H1 = (0.3 - 0.5)H.

7. A centrifugal fan impeller with combined blades as claimed in claim 6, characterized in that: The outlet height of the inter-blade-group guide vane (6) is H2, where H2 = (0.5 - 0.66)H.

8. A centrifugal fan impeller with combined blades as claimed in claim 7, characterized in that: H2 = 1.5H1.

9. A centrifugal fan impeller with combined blades as claimed in claim 1, characterized in that: The distance from the radial inner side of the inner guide vane (5) of the blade group to the impeller center is the front-end radius R1 of the inner guide vane of the blade group, R1 = (0.6 - 0.88)R, and the radial outer side of the inner guide vane (5) of the blade group is flush with the outlet end of the lower cover plate 3.

10. A centrifugal fan impeller with combined blades as claimed in claim 1, characterized in that: The distance from the radial inner side of the inter-blade-group guide vane (6) to the impeller center is the front-end radius R2 of the inter-blade-group guide vane, and the distance from the radial outer side of the inter-blade-group guide vane (6) to the impeller center is the rear-end radius R3 of the inter-blade-group guide vane, where R2 = (0.2 - 0.33)R, R3 = (0.55 - 0.69)R.

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