Centrifugal impeller, centrifugal fan and equipment applying centrifugal fan

Abstract

The utility model belongs to the technical field of fans, and discloses a centrifugal impeller, a centrifugal fan and equipment applying the centrifugal fan, and a plurality of connecting ribs are arranged in the circumferential direction of the centrifugal impeller at unequal intervals so as to increase the inherent frequency of the centrifugal impeller. The difference between the resonant frequency of equipment applying the centrifugal fan in the working process and the inherent frequency of the centrifugal impeller is large, so that the resonant frequency of the equipment applying the centrifugal fan in the working process cannot reach the inherent frequency of the centrifugal impeller, the resonance phenomenon of the centrifugal impeller is avoided, and the noise generated in the working process of the centrifugal impeller is reduced; in the circumferential direction of the connecting disc, the included angle located in the middle of at least one set of three adjacent included angles is larger than the included angles located on the two sides, and / or the included angle located in the middle of at least one set of three adjacent included angles is smaller than the included angles located on the two sides; and the mass distribution uniformity of the centrifugal impeller is considered as much as possible, so that the centrifugal impeller is subsequently counterweighted to balance the gravity center.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a centrifugal impeller, a centrifugal fan, and equipment using the centrifugal fan. Background Technology

[0002] A double-sided air intake impeller typically includes a front disc, a rear disc, a middle disc located between the front and rear discs, and blades. The motor is usually mounted on the middle disc, and the motor provides power to drive the impeller to rotate and create a negative pressure zone, allowing external airflow to enter the fan casing.

[0003] The middle plate includes a motor mounting section and blade mounting sections spaced apart outside the motor mounting section. The blade mounting section and the motor mounting section are connected by multiple circumferentially evenly distributed connecting ribs. Ventilation holes are formed between two adjacent connecting ribs to balance the airflow on both sides of the middle plate and reduce impeller noise.

[0004] However, in actual application, it was found that the airflow on both sides of the middle plate also generates noise when flowing through the vent holes. This causes the resonant frequency generated by the impeller when using the middle plate to be very close to the impeller's own natural frequency, making the impeller very prone to resonance problems and generating a lot of noise. Utility Model Content

[0005] One of the technical problems solved by this invention is to provide a centrifugal impeller that can avoid the problem of impeller resonance.

[0006] The second technical problem solved by this utility model is to provide a centrifugal fan that can reduce noise during the operation of the fan.

[0007] The third technical problem solved by this utility model is to provide a device that uses a centrifugal fan to reduce noise during the operation of the device.

[0008] The first technical problem mentioned above is solved by the following technical solution:

[0009] Centrifugal impeller, including:

[0010] A connecting plate, comprising a central portion, a connecting ring sleeved outside the central portion, and a plurality of connecting ribs connecting the central portion and the connecting ring, wherein the plurality of connecting ribs are arranged at non-equidistant intervals along the circumference of the connecting plate; the included angle between two adjacent connecting ribs is α; along the circumference of the connecting plate, at least one set of three adjacent included angles has an included angle in the middle that is greater than the included angles on both sides; and / or, along the circumference of the connecting plate, at least one set of three adjacent included angles has an included angle in the middle that is less than the included angles on both sides;

[0011] Multiple blades are arranged at circumferential intervals along the connecting disc, and the blades are mounted on the connecting ring.

[0012] The centrifugal impeller described in this utility model has the following advantages compared with the prior art:

[0013] In this application, multiple connecting ribs are arranged at non-equidistant intervals along the circumference of the connecting plate to increase the natural frequency of the centrifugal impeller. This results in a significant difference between the resonant frequency of the equipment using the centrifugal fan and the natural frequency of the centrifugal impeller during operation. Consequently, the resonant frequency of the equipment using the centrifugal fan during operation does not reach the natural frequency of the centrifugal impeller, thus avoiding resonance of the centrifugal impeller and reducing the noise generated during operation. Furthermore, it is stipulated that along the circumference of the connecting plate, at least one set of three adjacent included angles has an angle where the middle angle is greater than the angles on both sides, and / or along the circumference of the connecting plate, at least one set of three adjacent included angles has an angle where the middle angle is smaller than the angles on both sides. This ensures that the mass distribution of the centrifugal impeller is as uniform as possible, so that the centrifugal impeller can be counterweighted to balance the center of gravity.

[0014] In one embodiment, the difference between two adjacent included angles is less than or equal to 25°.

[0015] In one embodiment, the line passing through the center of gravity of the connecting rib and intersecting perpendicularly with the central axis of the connecting disc is a preset straight line;

[0016] Along the circumference of the connecting disc, the angle between the projections of two adjacent preset straight lines onto a plane perpendicular to the central axis is α.

[0017] In one embodiment, the connecting disk is an integrally formed structure, and the blade is integrally formed on the connecting disk.

[0018] In one embodiment, the width of the connecting rib along the circumference of the connecting disc is L, and the width of the connecting disc remains unchanged along the radial direction of the connecting disc away from the center of the connecting disc.

[0019] In one embodiment, the minimum distance between two adjacent blades along the circumference of the connecting disk is ΔL, where L > ΔL.

[0020] In one embodiment, the connecting disk is a middle disk, and the plurality of blades include a plurality of first blades and a plurality of second blades. The plurality of first blades are distributed at intervals along the circumference of the connecting ring on one axial side of the connecting ring, and the plurality of second blades are distributed at intervals along the circumference of the connecting ring on the other axial side of the connecting ring.

[0021] Multiple first blades and multiple second blades are arranged in a one-to-one correspondence; the first blades and corresponding second blades are arranged symmetrically about the connecting ring; or, the first blades and corresponding second blades are arranged asymmetrically about the connecting ring.

[0022] In one embodiment, the first blade and the corresponding second blade are arranged in a staggered manner along the circumference of the connecting disk; or, the first blade and the corresponding second blade are arranged facing each other along the axial direction of the connecting disk.

[0023] The second technical problem mentioned above is solved by the following technical solution:

[0024] A centrifugal fan includes a motor, a volute, and a centrifugal impeller as provided in any of the above embodiments. The centrifugal impeller is rotatably mounted inside the volute, and the output shaft of the motor is connected to the center of the centrifugal impeller to drive the centrifugal impeller to rotate.

[0025] Compared with the prior art, the centrifugal fan described in this utility model has the following beneficial effects:

[0026] The centrifugal fan of this invention includes the aforementioned centrifugal impeller, with multiple connecting ribs arranged at non-equidistant intervals along the circumference of the connecting plate. This increases the natural frequency of the centrifugal impeller, making the resonant frequency of the equipment using the centrifugal fan during operation significantly different from the natural frequency of the centrifugal impeller. Consequently, the resonant frequency of the equipment using the centrifugal fan during operation does not reach the natural frequency of the centrifugal impeller, thus avoiding resonance of the centrifugal impeller and reducing noise generated during operation. Furthermore, it further stipulates that along the circumference of the connecting plate, at least one set of three adjacent included angles has an angle where the middle angle is greater than the included angles on both sides, and / or along the circumference of the connecting plate, at least one set of three adjacent included angles has an angle where the middle angle is smaller than the included angles on both sides. This ensures that the mass distribution of the centrifugal impeller is as uniform as possible, facilitating subsequent counterweighting of the impeller to balance its center of gravity.

[0027] The third technical problem mentioned above is solved by the following technical solution:

[0028] Equipment that uses centrifugal fans includes the centrifugal fans mentioned above.

[0029] Compared with the prior art, the device using a centrifugal fan described in this utility model has the following advantages:

[0030] The device using a centrifugal fan described in this utility model includes the aforementioned centrifugal fan. Multiple connecting ribs are arranged at non-equidistant intervals along the circumference of the connecting plate to increase the natural frequency of the centrifugal impeller. This results in a significant difference between the resonant frequency of the device using the centrifugal fan and the natural frequency of the centrifugal impeller during operation. Consequently, the resonant frequency of the device using the centrifugal fan during operation does not reach the natural frequency of the centrifugal impeller, thus avoiding resonance in the centrifugal impeller and reducing noise generated during operation. Furthermore, it further stipulates that along the circumference of the connecting plate, at least one set of three adjacent included angles has an angle where the middle angle is greater than the angles on either side, and / or along the circumference of the connecting plate, at least one set of three adjacent included angles has an angle where the middle angle is smaller than the angles on either side. This ensures that the mass distribution of the centrifugal impeller is as uniform as possible, facilitating subsequent counterweighting to balance the center of gravity.

[0031] In one embodiment, the device using the centrifugal fan is a gas-fired hot water device or a fume extraction device. Attached Figure Description

[0032] Figure 1 This is a radial schematic diagram of the centrifugal impeller provided in an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the centrifugal impeller provided in an embodiment of the present invention;

[0034] Figure 3 This is an axial schematic diagram of the centrifugal impeller provided in an embodiment of this utility model;

[0035] Figure 4 This is a schematic diagram of the spectrum simulation of the centrifugal impeller provided in this embodiment of the utility model;

[0036] Figure 5 This is a schematic diagram of the spectrum simulation of an existing centrifugal impeller;

[0037] Figure 6 This is a schematic diagram of the spectrum simulation of an existing centrifugal impeller.

[0038] In the picture:

[0039] 1. Leaf blade; 11. First leaf blade; 12. Second leaf blade;

[0040] 2. Connecting plate; 21. Center part; 22. Connecting ring; 23. Connecting rib; 24. Air guide hole. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] This utility model provides a centrifugal impeller, a centrifugal fan including the impeller, and a device including the centrifugal fan. By reducing the noise during the operation of the centrifugal impeller, the noise of the centrifugal fan is reduced, improving the user experience when using the device with the centrifugal fan. The device using the centrifugal fan can be a gas-fired water heating system, such as a gas water heater, gas boiler, or gas heating boiler; it can also be a fume extraction system with oil fume extraction function, such as a range hood, integrated range hood and stove, or integrated stove. In devices using centrifugal fans, the centrifugal fan is mainly used as an air supply device. Devices using centrifugal fans are not limited to gas-fired water heating systems and fume extraction systems; they can also be other devices that use the aforementioned centrifugal fan as an air supply device, and are not specifically limited here.

[0046] like Figures 1 to 3As shown, the centrifugal fan also includes a motor and a volute. The centrifugal impeller is rotatably installed inside the volute. The output shaft of the motor is connected to the centrifugal impeller to drive the centrifugal impeller to rotate, so that the external airflow enters the volute through the air inlet of the centrifugal fan and is sent to the air outlet of the centrifugal fan by the centrifugal impeller.

[0047] The centrifugal impeller includes a connecting disk 2 and multiple blades 1. The connecting disk 2 includes a central portion 21, a connecting ring 22 sleeved outside the central portion 21, and multiple connecting ribs 23 connecting the central portion 21 and the connecting ring 22. The multiple connecting ribs 23 are arranged at intervals along the circumference of the connecting disk 2, and the multiple blades 1 are arranged at intervals along the circumference of the connecting disk 2. The blades 1 are mounted on the connecting ring 22. Specifically, the central portion 21 is connected to the output shaft of the motor.

[0048] An air guide hole 24 is formed between two adjacent connecting ribs 23. The air guide hole 24 connects the cavities on both sides of the connecting plate 2, which not only allows the airflow on both sides of the connecting plate 2 to flow, but also improves the uniformity of air intake on both sides of the connecting plate 2, improves the pressure inconsistency on both sides of the connecting plate 2, and improves the efficiency of the centrifugal fan.

[0049] In existing centrifugal impellers, multiple connecting ribs are arranged at equal intervals along the circumference of the impeller; in other words, the connecting ribs are uniformly distributed along the circumference of the impeller. Taking a centrifugal impeller with six connecting ribs as an example, simulation verification revealed that the fourth natural frequency of this centrifugal impeller is 289Hz. When the product of the number of connecting ribs and the rotational speed of the centrifugal impeller is approximately equal to the fourth natural frequency of the centrifugal impeller, there are obvious spikes in the frequency spectrum of the centrifugal impeller, indicating that the centrifugal impeller has resonated and generated significant noise.

[0050] In view of this, the centrifugal impeller provided in the embodiment of this utility model proposes to arrange multiple connecting ribs 23 at non-equal intervals, with the included angle between two adjacent connecting ribs 23 being α; there is at least one set of three adjacent included angles in which the included angle in the middle is greater than the included angle on both sides, and / or there is at least one set of three adjacent included angles in which the included angle in the middle is less than the included angle on both sides.

[0051] It should be noted that the line passing through the center of gravity of the connecting rib 23 and intersecting perpendicularly with the central axis of the connecting plate 2 is a preset straight line. Along the circumference of the connecting plate 2, the angle between the projections of two adjacent preset straight lines in a plane perpendicular to the central axis is the included angle α.

[0052] This centrifugal impeller, by arranging multiple connecting ribs 23 at non-equidistant intervals along the circumference of the impeller, increases the natural frequency of the impeller. This results in a significant difference between the resonant frequency of the equipment using this centrifugal fan and the natural frequency of the impeller during operation. The resonant frequency of the equipment using this centrifugal fan does not reach the natural frequency of the impeller, thereby avoiding resonance in the impeller, reducing noise generated during operation, and improving the user experience.

[0053] Furthermore, it is further specified that along the circumference of the connecting plate 2, there exists at least one set of three adjacent included angles, the angle of the middle included angle being greater than the angle of the included angles on both sides, and / or, along the circumference of the connecting plate 2, there exists at least one set of three adjacent included angles, the angle of the middle included angle being less than the angle of the included angles on both sides, thereby maximizing the uniformity of the centrifugal impeller mass distribution so that the centrifugal impeller can be counterweighted to balance the center of gravity.

[0054] In some embodiments, the magnitudes of the multiple included angles α along the circumference of the connecting disk 2 exhibit a wave-like variation, thus causing alternating maxima and minima among the multiple included angles α. This arrangement is more conducive to improving the uniformity of impeller mass distribution.

[0055] Specifically, among multiple included angles, there must be at least one included angle between two adjacent maxima and at least one included angle between two adjacent minima. This can be understood as either no included angle or an included angle existing between adjacent maxima and minima. For example, if the included angle in the middle of three adjacent included angles is smaller than or larger than the two included angles at the edges, then there is no included angle between adjacent maxima and minima. If the three included angles decrease sequentially or increase sequentially, then there is an included angle between maxima and minima.

[0056] In some embodiments, the difference between two adjacent included angles is less than or equal to 25°, so that the multiple connecting ribs 23 are arranged at non-equidistant intervals.

[0057] The number of connecting ribs 23 can be set to four to eight. For example, there are five connecting ribs 23 along the circumference of the connecting disc 2, with the five included angles α being 60°, 80°, 60°, 85° and 75° respectively.

[0058] Structural modal analysis was performed on the centrifugal fan with the centrifugal impeller arranged with five connecting ribs 23 as described above. The structural modal analysis diagram is shown below. Figure 4 Structural modal analysis and FFT spectrum simulation experiments were conducted on a centrifugal fan using a centrifugal impeller with six circumferentially distributed connecting ribs 23 in the existing technology. The structural modal analysis diagram is shown below. Figure 5 As shown, see the FFT spectrum analysis diagram. Figure 6 As shown.

[0059] The existing centrifugal impeller has a fourth-order natural frequency of 288.68 Hz, and its spectrum exhibits obvious spikes, indicating resonance during operation. The resonant frequency of the existing impeller is close to its fourth-order natural frequency. However, the centrifugal impeller provided in this embodiment has a first-order natural frequency of 319.68 Hz, a second-order natural frequency of 340.36 Hz, a third-order natural frequency of 359.77 Hz, and a fourth-order natural frequency of 418.85 Hz. This significantly increased natural frequency means that the resonant frequency of the equipment using this centrifugal fan differs considerably from the impeller's natural frequency, effectively avoiding resonance and preventing the impeller from resonating.

[0060] In some embodiments, such as Figures 1 to 3 As shown, the connecting disc 2 is a one-piece molded structure, and the blade 1 is integrally molded onto the connecting disc 2. This design simplifies the machining of the centrifugal impeller and reduces its machining cost.

[0061] In some embodiments, such as Figures 1 to 3 As shown, the width of the connecting rib 23 along the circumference of the connecting disc 2 is L, and the width of the connecting disc 2 remains unchanged along the radial direction of the connecting disc 2 away from the center of the connecting disc 2.

[0062] Since the airflow of the centrifugal impeller is low at the center and high near the blade 1, the aforementioned connecting rib 23 is used so that the size of the air guide hole 24 gradually increases in the circumferential direction of the connecting plate 2 along the radial direction away from the center of the connecting plate 2. In other words, the air guide hole 24 is a fan-shaped hole. This type of air guide hole 24 can match the airflow of the centrifugal impeller and can better balance the airflow on both sides of the connecting plate 2.

[0063] In some embodiments, such as Figures 1 to 3 As shown, along the circumference of the connecting disc 2, the minimum distance between two adjacent blades 1 is ΔL, where L > ΔL. This setting ensures that the structural strength of the connecting rib 23 meets the connection requirements, preventing deformation due to insufficient structural strength of the connecting rib 23 during centrifugal impeller rotation, and extending the service life of the connecting disc 2. It should be noted that ΔL at the position shown in the figure is not necessarily the minimum distance between two adjacent blades 1.

[0064] In some embodiments, such as Figures 1 to 3As shown, the connecting disk 2 is the central disk, and the multiple blades 1 include multiple first blades 11 and multiple second blades 12. The multiple first blades 11 are distributed at intervals along the circumference of the connecting ring 22 on one side of the axial direction of the connecting ring 22, and the multiple second blades 12 are distributed at intervals along the circumference of the connecting ring 22 on the other side of the axial direction of the connecting ring 22. Exemplarily, the multiple first blades 11 and the multiple second blades 12 are arranged in a one-to-one correspondence, and each first blade 11 and its corresponding second blade 12 are symmetrically arranged about the connecting ring 22.

[0065] This configuration enables the centrifugal impeller to function as a dual-suction centrifugal impeller, increasing the air intake volume of the impeller to meet the requirements of strong blowing, and is especially suitable for gas water heaters with multiple speed settings.

[0066] As an alternative, each first blade 11 and its corresponding second blade 12 can also be arranged asymmetrically about the connecting ring 22. This arrangement can increase the maximum static pressure of the centrifugal impeller. Alternatively, some of the first blades 11 and their corresponding second blades 12 can be arranged symmetrically about the connecting ring 22, while others can be arranged asymmetrically about the connecting ring 22.

[0067] It should be noted that the connecting plate 2 mentioned above can also be a front plate or a rear plate. When the connecting plate 2 is a front plate or a rear plate, the centrifugal impeller is generally a single-suction centrifugal impeller. All blades 1 are located on the same side of the circumference of the connecting ring 22. In order to improve the stability of the relative position between multiple blades 1, the centrifugal impeller also includes a connecting frame. The blades 1 are located between the connecting frame and the connecting ring 22 along the axial direction of the centrifugal impeller. One end of the blade 1 is connected to the connecting frame, and the other end is connected to the connecting ring 22.

[0068] In some embodiments, the first blade 11 and the corresponding second blade 12 are arranged symmetrically about the connecting ring 22; alternatively, the first blade 11 and the corresponding second blade 12 can be arranged asymmetrically about the connecting ring 22. It should be noted that the asymmetrical arrangement of the first blade 11 and the corresponding second blade 12 about the connecting ring 22 can also increase the natural frequency of the centrifugal impeller.

[0069] In some embodiments, the centrifugal impeller further includes two connecting frames, with a connecting ring 22 located between the two connecting frames along the axial direction of the centrifugal impeller. Specifically, for ease of description, the two connecting frames are referred to as the first frame and the second frame, respectively. A plurality of first blades 11 are disposed between the first frame and the connecting ring 22, with one axial end of each first blade 11 connected to the first frame and the other end connected to the connecting ring 22. A plurality of second blades 12 are disposed between the second frame and the connecting ring 22, with one axial end of each second blade 12 connected to the second frame and the other end connected to the connecting ring 22. By providing two connecting frames, the relative stability between two adjacent blades 1 can be improved.

[0070] For example, the first blade 11 is integrally formed on the first frame, and the second blade 12 is integrally formed on the second frame. In other words, the entire centrifugal impeller is an integrally formed structure, which simplifies the processing of the centrifugal impeller and reduces the processing cost of the centrifugal impeller.

[0071] It should be noted that the centrifugal impeller can be integrally injection molded or integrally die-cast. The molding process of the centrifugal impeller is simple and the processing cost is low. The connecting frame can also be eliminated, and multiple blades 1 can be connected by only the connecting plate 2.

[0072] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0073] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A centrifugal impeller, characterized in that, include: A connecting disc (2) includes a central portion (21), a connecting ring (22) sleeved outside the central portion (21), and a plurality of connecting ribs (23) connecting the central portion (21) and the connecting ring (22). The plurality of connecting ribs (23) are arranged non-equally around the circumference of the connecting disc (2). The included angle between two adjacent connecting ribs (23) is α. Along the circumference of the connecting disc (2), there exists at least one set of three adjacent included angles in which the angle in the middle is greater than the angle in the included angles on both sides, and / or. Along the circumference of the connecting disc (2), there exists at least one set of three adjacent included angles in which the angle in the middle is less than the angle in the included angles on both sides. Multiple blades (1) are arranged at circumferential intervals along the connecting disk (2), and the blades (1) are mounted on the connecting ring (22).

2. The centrifugal impeller according to claim 1, characterized in that, The line passing through the center of gravity of the connecting rib (23) and intersecting perpendicularly with the central axis of the connecting disc (2) is a preset straight line; Along the circumference of the connecting disk (2), the angle between the projections of two adjacent preset straight lines in a plane perpendicular to the central axis is α.

3. The centrifugal impeller according to claim 1, characterized in that, The difference between two adjacent included angles is less than or equal to 25°.

4. The centrifugal impeller according to claim 1, characterized in that, The connecting disk (2) is an integrally formed structure, and the blade (1) is integrally formed on the connecting disk (2).

5. The centrifugal impeller according to claim 1, characterized in that, The width of the connecting rib (23) along the circumference of the connecting disc (2) is L, and the width of the connecting disc (2) remains unchanged along the radial direction of the connecting disc (2) away from the center of the connecting disc (2).

6. The centrifugal impeller according to claim 5, characterized in that, Along the circumference of the connecting disk (2), the minimum distance between two adjacent blades (1) is △L, where L > △L.

7. The centrifugal impeller according to any one of claims 1 to 6, characterized in that, The plurality of blades (1) include a plurality of first blades (11) and a plurality of second blades (12). The plurality of first blades (11) are distributed at intervals along the circumference of the connecting ring (22) on one side of the axial direction of the connecting ring (22), and the plurality of second blades (12) are distributed at intervals along the circumference of the connecting ring (22) on the other side of the axial direction of the connecting ring (22). A plurality of first blades (11) and a plurality of second blades (12) are arranged in a one-to-one correspondence; at least a portion of the first blades (11) and the corresponding second blades (12) are arranged in a circumferentially offset manner along the connecting disk (2); and / or, at least a portion of the first blades (11) and the corresponding second blades (12) are arranged facing each other along the axial direction of the connecting disk (2).

8. The centrifugal impeller according to claim 7, characterized in that, The first blade (11) and the corresponding second blade (12) are arranged symmetrically about the connecting ring (22); or, the first blade (11) and the corresponding second blade (12) are arranged asymmetrically about the connecting ring (22).

9. A centrifugal fan, characterized in that, It includes a motor, a volute, and a centrifugal impeller as described in any one of claims 1 to 8, wherein the centrifugal impeller is rotatably mounted inside the volute, and the output shaft of the motor is connected to the center (21) of the centrifugal impeller to drive the centrifugal impeller to rotate.

10. Equipment using a centrifugal fan, characterized in that, Includes the centrifugal fan as described in claim 9.

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