High-performance impeller and fan using the same

Abstract

The application discloses a high-performance impeller and a fan using the same. The blade group comprises a main blade group and an auxiliary blade group arranged in series. The main blade group comprises a first main blade and a second main blade. The auxiliary blade group comprises a first auxiliary blade and a second auxiliary blade. The flow channel A formed by the first main blade and the second main blade in a flow direction is a gradually expanding flow channel. The flow channel B formed by the first auxiliary blade and the second auxiliary blade in the flow direction is a gradually expanding flow channel. The main blade small blade and the auxiliary blade small blade are both straight plate type blades. The two blades are arranged in a staggered and overlapped mode in the flow direction and form a gradually tapering jet flow channel C. The impeller and the fan using the same are improved, and the problems of poor adaptability, large flow loss, poor stability, high surge, high noise and low efficiency are solved. The working condition performance and the operation efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, specifically to a high-performance impeller, and more specifically to a fan using the same. Background Technology

[0002] Centrifugal fans are commonly used for ventilation, dust removal, and cooling. They are characterized by their small size, simple structure, good ventilation effect, and economic efficiency, and are closely related to people's living environment. During operation, centrifugal fans generate uneven pressure pulsations, resulting in aerodynamic noise and vibration. However, optimizing the structure and layout of the impeller blades can improve the dynamic characteristics after stall, delay the occurrence of stall, and significantly reduce broadband noise and instability caused by turbulent interference. Therefore, optimizing the impeller design is essential.

[0003] Existing technology CN101655102A discloses a crossflow fan with dual pre-rotating inlet guide vanes, which employs a positive pre-rotating guide vane group 4 and a negative pre-rotating guide vane group 5. The positive pre-rotating guide vane group 4 includes five inlet guide vanes, and the negative pre-rotating guide vane group 5 includes two inlet guide vanes. The inlet guide vanes in the positive pre-rotating guide vane group 4 are arranged sequentially from the end of the volute 3 at the crossflow fan inlet towards the center of the crossflow fan inlet, while the inlet guide vanes in the negative pre-rotating guide vane group 5 are arranged sequentially from the end of the volute tongue 2 at the crossflow fan inlet towards the center of the crossflow fan inlet. This structure is simple and can be easily installed on various types of crossflow fans used for ventilation, improving the local air intake conditions of the crossflow fan, increasing its aerodynamic efficiency, and broadening its stable operating range.

[0004] However, the above-mentioned impeller structure has design limitations, involving only the design of some non-general impeller structures without fundamentally changing the impeller structure. It has poor adaptability, large flow losses, poor stability, high surge, high noise, and low efficiency. Therefore, in order to address these problems, the applicant proposes a high-performance impeller and a fan using it to solve the above-mentioned problems, reduce surge, noise, and instability, and thus improve operating performance and efficiency. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art by proposing a high-performance impeller and a fan using the same.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A high-performance impeller includes a hub, an impeller cover, and blades; the impeller cover is mounted on one side of the blades, and the other side of the blades is mounted on the hub to form the impeller; characterized in that: the blades are composed of a circumferential array of blade groups; the blade groups include a main blade group and an auxiliary blade group arranged in series, wherein the main blade group includes a first main blade and a second main blade, and the auxiliary blade group includes a first auxiliary blade and a second auxiliary blade, the first main blade and the first auxiliary blade are arranged in series correspondingly in the flow direction, and the second main blade and the second auxiliary blade are arranged in series correspondingly in the flow direction; the first main blade and the second main blade are... The blades are twisted. The flow channel A formed by the first and second main blades in the flow direction is a gradually expanding flow channel. The first and second auxiliary blades are cylindrical blades, and the flow channel B formed by the first and second auxiliary blades in the flow direction is a gradually expanding flow channel. The outlet ends of the first and second main blades are provided with main blade leaflets, and the inlet ends of the first and second auxiliary blades are provided with auxiliary blade leaflets. The main blade leaflets and auxiliary blade leaflets are both straight blades. They are staggered and overlapped in the flow direction to form a gradually narrowing jet flow channel C. The trailing edge of the main blade leaflets is a serrated structure.

[0008] Furthermore, the main leaf group has a forward-curving leaf shape, while the auxiliary leaf group has a backward-curving leaf shape.

[0009] Furthermore, the length of the main blade group in the radial direction is H1, and the length of the auxiliary blade group in the radial direction is H2, where H1 > H2.

[0010] Furthermore, H1 = (1.2 ~ 2.5)H2.

[0011] Furthermore, the inlet width of the main blade assembly is L1, and the outlet width is W1, where 2.2L1 < W1 < 3.5L1.

[0012] Furthermore, the width of the auxiliary blade assembly in the inlet direction is L2, and the width in the outlet direction is W2, where 3.2L2 < W2 < 3.9L2.

[0013] Furthermore, W2 > W1.

[0014] Furthermore, the angle M formed by the leaflet of the main leaf and the leaflet of the auxiliary leaf ranges from 20° to 36°.

[0015] Furthermore, both flow channels A and B are arc-shaped flow channels.

[0016] A centrifugal fan has a flow guide shroud, which includes a radial partition plate and a circumferential flow guide plate. The circumferential flow guide plate has a flow guide protrusion along the flow direction at the intersection of the radial partition plate and the circumferential flow guide plate. The centrifugal fan includes a high-performance impeller.

[0017] Furthermore, the cross-sectional shape of the guide protrusion after unfolding along the circumferential section is triangular, trapezoidal, rectangular, or rhomboid.

[0018] Furthermore, the radial partition plate, the circumferential guide plate, and the guide protrusion are integrally molded to form a guide shield.

[0019] This invention discloses a high-performance impeller and a fan using the same, comprising a hub, an impeller cover, and blades; the impeller cover is mounted on one side of the blades, and the other side of the blades is mounted on the hub to form the impeller; characterized in that: the blades are composed of a circumferential array of blade groups; the blade groups include a main blade group and an auxiliary blade group arranged in series, wherein the main blade group includes a first main blade and a second main blade, and the auxiliary blade group includes a first auxiliary blade and a second auxiliary blade, the first main blade and the first auxiliary blade are arranged in series correspondingly in the flow direction, and the second main blade and the second auxiliary blade are arranged in series correspondingly in the flow direction; the first main blade and the first ... The two main blades are twisted blades, and the flow channel A formed by the first and second main blades in the flow direction is a gradually expanding flow channel. The first and second auxiliary blades are cylindrical blades, and the flow channel B formed by the first and second auxiliary blades in the flow direction is a gradually expanding flow channel. Both the outlet ends of the first and second main blades are equipped with main blade leaflets, and the inlet ends of the first and second auxiliary blades are equipped with auxiliary blade leaflets. Both the main blade leaflets and auxiliary blade leaflets are straight blades, and they are staggered and overlapped in the flow direction, forming a gradually narrowing jet flow channel C. The trailing edges of the main blade leaflets have a serrated structure. Due to improvements to the impeller and the fan using it, problems such as poor adaptability, high flow loss, poor stability, high surge, high noise, and low efficiency have been solved, improving operating performance and efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a centrifugal fan.

[0021] Figure 2 This is a schematic diagram of the radial section of the impeller structure;

[0022] Figure 3 This is an enlarged schematic diagram of the radial section of the impeller structure;

[0023] Figure 4 This is a schematic diagram of the jet structure;

[0024] Figure 5 This is a schematic diagram of the fairing structure;

[0025] Figure 6 This is a schematic diagram of the circumferential cross-sectional structure of the guide protrusion.

[0026] In the diagram: Hub 1, Impeller cover 2, Blade 3, First main blade 31, Second main blade 32, First auxiliary blade 33, Second auxiliary blade 34, Shield 4, Radial partition 41, Circumferential guide plate 42, Guide protrusion 43, Flow channel A formed by the first main blade 31 and the second main blade 32 in the flow direction, Flow channel B formed by the first auxiliary blade 33 and the second auxiliary blade 34 in the flow direction, Main blade leaflet 35, Auxiliary blade leaflet 36, Flow channel C formed by the main blade leaflet 35 and the auxiliary blade leaflet in the flow direction, Length H1 of the main blade group in the radial direction, Length H2 of the auxiliary blade group in the radial direction, Width L1 of the main blade group in the inlet direction, Width W1 of the main blade group in the outlet direction, Width L2 of the auxiliary blade group in the inlet direction, Width W2 of the auxiliary blade group in the outlet direction, Angle M formed by the main blade leaflet 35 and the auxiliary blade leaflet 36. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings.

[0029] like Figure 1-6As shown, a high-performance impeller includes a hub 1, an impeller cover 2, and blades 3. The impeller cover 2 is mounted on one side of the blades 3, and the other side of the blades 3 is mounted on the hub 1 to form an impeller. The impeller is characterized in that: the blades 3 are composed of a circumferential array of blade groups; the blade groups include a main blade group and an auxiliary blade group arranged in series, wherein the main blade group includes a first main blade 31 and a second main blade 32, and the auxiliary blade group includes a first auxiliary blade 33 and a second auxiliary blade 34. The first main blade 31 and the first auxiliary blade 33 are arranged in series correspondingly in the flow direction, and the second main blade 32 and the second auxiliary blade 34 are arranged in series correspondingly in the flow direction; the first main blade 31 and the second main blade 32 are... The blades are twisted. The flow channel A formed by the first main blade 31 and the second main blade 32 in the flow direction is a gradually expanding flow channel. The first auxiliary blade 33 and the second auxiliary blade 34 are cylindrical blades. The flow channel B formed by the first auxiliary blade 33 and the second auxiliary blade 34 in the flow direction is a gradually expanding flow channel. The outlet end of the first main blade 31 and the second main blade 32 is provided with a main blade leaflet 35. The inlet end of the first auxiliary blade 33 and the second auxiliary blade 34 is provided with an auxiliary blade leaflet 36. The main blade leaflet 35 and the auxiliary blade leaflet 36 are both straight blades. They are staggered and overlapped in the flow direction to form a gradually narrowing jet flow channel C. The trailing edge of the main blade leaflet 35 is a serrated structure.

[0030] The shape and structure of the impeller significantly affect aerodynamic efficiency. Fluid enters the impeller through a series of gradually expanding blade channels. The geometric characteristics of the impeller blades cause the distribution of relative fluid velocity, which affects the flow pattern and ultimately impacts losses and efficiency due to vibration and noise. The impeller in this application differs from conventional impellers in the prior art. The applicant's research revealed that the quality of the impeller blade structure design directly affects the intensity of surge noise, etc. To address these issues, the applicant optimized the impeller blade structure by adopting a series-connected main blade group and auxiliary blade group. The main blade group includes a first main blade 31 and a second main blade 32, and the auxiliary blade group includes a first auxiliary blade 33 and a second auxiliary blade 34. An intermediate ejector structure is also employed. This jet-guided flow method accelerates fluid movement, reduces fluid residence time within the blades, and mitigates the impact of surge noise, etc. Furthermore, the structural design combining twisted blades and cylindrical blades makes the fluid flow path more stable, reducing the possibility of surge noise concentrating in a specific area and thus reducing its impact. In addition, the serrated tail edge structure is more conducive to reducing vibration and maintaining the stability of the fan.

[0031] Furthermore, the main leaf group has a forward-curving leaf shape, while the auxiliary leaf group has a backward-curving leaf shape.

[0032] Furthermore, the length of the main blade group in the radial direction is H1, and the length of the auxiliary blade group in the radial direction is H2, where H1 > H2.

[0033] Furthermore, H1 = (1.2 ~ 2.5)H2.

[0034] Furthermore, the inlet width of the main blade assembly is L1, and the outlet width is W1, where 2.2L1 < W1 < 3.5L1.

[0035] Furthermore, the width of the auxiliary blade assembly in the inlet direction is L2, and the width in the outlet direction is W2, where 3.2L2 < W2 < 3.9L2.

[0036] Furthermore, W2 > W1.

[0037] Blade shape and flow channel structure play a crucial role in improving flow patterns, helping to reduce vibration and noise and stabilize fluid flow.

[0038] Furthermore, the angle M formed by the primary leaflet 35 and the secondary leaflet 36 ranges from 20° to 36°.

[0039] The angle design is conducive to better ejection of the flowing fluid. The size of the ejection angle directly affects the flow efficiency. A suitable ejection angle greatly reduces the possibility of surge noise.

[0040] Furthermore, both flow channels A and B are arc-shaped flow channels.

[0041] A centrifugal fan, characterized in that the centrifugal fan has a flow guide shroud 4, the flow guide shroud 4 includes a radial partition plate 41 and a circumferential flow guide plate 42, the circumferential flow guide plate 42 is provided with a flow guide protrusion 43 along the flow direction at the overlap of the radial partition plate 41 and the circumferential flow guide plate 42; the centrifugal fan includes a high-performance impeller.

[0042] Furthermore, the cross-sectional shape of the guide protrusion 43 after unfolding along the circumferential section is triangular, trapezoidal, rectangular, or rhomboid.

[0043] Furthermore, the radial partition plate 41, the circumferential guide plate 42, and the guide protrusion 43 are integrally formed to form the guide shroud 4.

[0044] The addition of the flow-guiding protrusion has a significant effect on improving flow efficiency. Compared with the existing technology without the flow-guiding protrusion, this improved structure not only changes the flow pattern of the fluid at the overlapping position, but also greatly reduces noise and increases stability.

[0045] This invention discloses a high-performance impeller and a fan using the same, comprising a hub, an impeller cover, and blades; the impeller cover is mounted on one side of the blades, and the other side of the blades is mounted on the hub to form the impeller; characterized in that: the blades are composed of a circumferential array of blade groups; the blade groups include a main blade group and an auxiliary blade group arranged in series, wherein the main blade group includes a first main blade and a second main blade, and the auxiliary blade group includes a first auxiliary blade and a second auxiliary blade, the first main blade and the first auxiliary blade are arranged in series correspondingly in the flow direction, and the second main blade and the second auxiliary blade are arranged in series correspondingly in the flow direction; the first main blade and the first ... The two main blades are twisted blades, and the flow channel A formed by the first and second main blades in the flow direction is a gradually expanding flow channel. The first and second auxiliary blades are cylindrical blades, and the flow channel B formed by the first and second auxiliary blades in the flow direction is a gradually expanding flow channel. Both the outlet ends of the first and second main blades are equipped with main blade leaflets, and the inlet ends of the first and second auxiliary blades are equipped with auxiliary blade leaflets. Both the main blade leaflets and auxiliary blade leaflets are straight blades, and they are staggered and overlapped in the flow direction, forming a gradually narrowing jet flow channel C. The trailing edges of the main blade leaflets have a serrated structure. Due to improvements to the impeller and the fan using it, problems such as poor adaptability, high flow loss, poor stability, high surge, high noise, and low efficiency have been solved, improving operating performance and efficiency.

Claims

1. A high-performance impeller, comprising a hub (1), an impeller cover plate (2), and blades (3); the impeller cover plate (2) is mounted on one side of the blades (3), and the other side of the blades (3) is mounted on the hub (1) to form the impeller; characterized in that: The blade (3) is composed of a circumferential array of blade groups; the blade group includes a main blade group and an auxiliary blade group arranged in series, wherein the main blade group includes a first main blade (31) and a second main blade (32), and the auxiliary blade group includes a first auxiliary blade (33) and a second auxiliary blade (34). The first main blade (31) and the first auxiliary blade (33) are arranged in series in the flow direction, and the second main blade (32) and the second auxiliary blade (34) are arranged in series in the flow direction. The first main blade (31) and the second main blade (32) are twisted blades, and the flow channel A formed by the first main blade (31) and the second main blade (32) in the flow direction is a gradually expanding flow channel. The first auxiliary blade (33) and the second auxiliary blade (34) are cylindrical blades, and the first auxiliary blade (33) and the second auxiliary blade (34) in the flow direction form a cylindrical flow channel. Flow channel B is a gradually expanding flow channel; the outlet ends of the first main blade (31) and the second main blade (32) are provided with main blade leaflets (35), and the inlet ends of the first auxiliary blade (33) and the second auxiliary blade (34) are provided with auxiliary blade leaflets (36). The main blade leaflets (35) and the auxiliary blade leaflets (36) are both straight blades. They are staggered and overlapped in the flow direction to form a gradually narrowing jet flow channel C. The trailing edge of the main blade leaflets (35) is a serrated structure. The blade profile of the main blade group is a forward blade profile, and the blade profile of the auxiliary blade group is a backward blade profile. The length of the main blade group in the radial direction is H1, and the length of the auxiliary blade group in the radial direction is H2, where H1 > H2. The inlet width of the main blade group is L1, and the outlet width is W1, where 2.2L1 < W1 < 3.5L1.

2. The high-performance impeller as described in claim 1, characterized in that, H1 = (1.2 ~ 2.5)H2.

3. The high-performance impeller as described in claim 1, characterized in that, The width of the auxiliary blade assembly in the inlet direction is L2, and the width in the outlet direction is W2, where 3.2L2 < W2 < 3.9L2.

4. A high-performance impeller as described in claim 3, characterized in that, W2 > W1.

5. A high-performance impeller as described in claim 1, characterized in that, The angle M formed by the leaflet (35) of the main leaf and the leaflet (36) of the auxiliary leaf has a range of 20° to 36°.

6. A high-performance impeller as described in claim 1, characterized in that, Both flow channels A and B are arc-shaped flow channels.

7. A centrifugal fan, characterized in that, The centrifugal fan has a flow guide shroud (4), which includes a radial partition plate (41) and a circumferential flow guide plate (42). The circumferential flow guide plate (42) has a flow guide protrusion (43) along the flow direction at the intersection of the radial partition plate (41) and the circumferential flow guide plate (42). The centrifugal fan includes a high-performance impeller as described in any one of claims 1 to 6.

8. A centrifugal fan as described in claim 7, characterized in that, The cross-sectional shape of the guide protrusion (43) after unfolding along the circumferential section is triangular, trapezoidal, rectangular or rhomboid.

9. A centrifugal fan as described in claim 7, characterized in that, The radial partition plate (41), the circumferential guide plate (42), and the guide protrusion (43) are integrally formed to form the guide shroud (4).

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