A bearingless high-speed centrifugal fan

Abstract

This invention discloses a bearingless high-speed centrifugal fan, comprising a volute casing. Inside the volute casing are a central column, a rotor, a stator, and an impeller connected together. The top center of the impeller is connected to the top of the volute casing. The impeller and rotor are connected by interference fit or adhesive bonding. A gap exists between the impeller and rotor assembly and the central column and stator, allowing the impeller and rotor assembly to suspend between them. This gap serves as an air passage. The impeller's outlet and the fan's outlet are not on the same plane. This invention, by fixing the rotor and impeller within the volute casing and the air passage between the central column and stator, allows the impeller and rotor to suspend inside the volute casing without the need for bearing support. This eliminates the need for traditional bearings, broadening the fan's application scenarios, increasing efficiency, reducing noise, and extending its lifespan.

Description

Technical Field

[0001] This invention relates to the field of centrifugal fan equipment technology, and in particular to a bearingless high-speed centrifugal fan. Background Technology

[0002] Most current high-speed centrifugal fans use either oil-impregnated ball bearings or oil-free ceramic bearings. Oil-impregnated ball bearings, due to their grease content, are unsuitable for many applications where grease is prohibited, such as hydrogen-oxygen fuel cells. While oil-free ceramic bearings do not contain grease, they suffer from significant mechanical friction losses under high-speed loads, reducing efficiency. High-speed friction also exacerbates bearing noise, increases high-speed bearing wear, and shortens bearing life. Therefore, there is an urgent need to provide a bearingless high-speed centrifugal fan to address these issues. Summary of the Invention

[0003] The purpose of this invention is to provide a bearingless high-speed centrifugal fan to solve the above-mentioned problems.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This invention discloses a bearingless high-speed centrifugal fan, comprising a volute, inside which are arranged a central column, a rotor, a stator, and an impeller connected together. The top center of the impeller is connected to the top of the volute. The impeller and the rotor are connected by interference fit or adhesive bonding. A gap is provided between the impeller and rotor assembly and the central column and stator, allowing the impeller and rotor assembly to suspend between the central column and stator. The gap between the impeller and rotor assembly and the central column and stator forms an air passage. The air outlet of the impeller and the air outlet of the fan are not on the same plane.

[0006] Furthermore, the volute includes an upper volute and a lower volute connected by one of ultrasonic waves, adhesive, or bolts.

[0007] Furthermore, the top center of the impeller is positioned within a slot provided on the inner wall of the upper volute.

[0008] Furthermore, a top post is provided at the center of the upper volute, and the bottom of the top post is positioned above the center top of the impeller.

[0009] Furthermore, the volute and the stator are connected by either adhesive or screws.

[0010] Furthermore, the volute and the motor are connected by either screws or clips.

[0011] Furthermore, the impeller and the motor are connected by either threaded locking or press-fitting.

[0012] Furthermore, the stator is fixed to the central column by either adhesive or screws.

[0013] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0014] This invention fixes the rotor and impeller within the air passage between the volute and the central column and stator, allowing the impeller and rotor to suspend inside the volute without the need for bearing support. This eliminates the need for traditional bearings in the fan, making it more versatile, more efficient, quieter, and longer-lasting. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a cross-sectional view of Embodiment 1 of the present invention;

[0017] Figure 2 This is a cross-sectional view of Embodiment 2 of the present invention;

[0018] Explanation of reference numerals in the attached diagram: 1. Volute; 101. Upper volute; 102. Lower volute; 2. Central column; 3. Rotor; 4. Stator; 5. Impeller; 6. Slot; 7. Top column; 8. Air passage. Detailed Implementation

[0019] Example 1

[0020] like Figure 1 As shown, a bearingless high-speed centrifugal fan includes a volute 1, and the interior of the volute 1 is provided with a central column 2, a rotor 3, a stator 4 and an impeller 5 connected to each other.

[0021] The volute 1 includes an upper volute 101 and a lower volute 102 connected by one of ultrasonic waves, adhesive, or bolts.

[0022] The volute 1 and the stator 4 are connected by either adhesive or screws.

[0023] The volute 1 is connected to the motor by either screw locking or clip locking, so that the motor can be removed from the volute 1 after a motor failure, thereby increasing the maintainability of the entire fan.

[0024] The stator 4 is fixed to the central column 2 by one of adhesive or screws.

[0025] The top center of the impeller 5 is connected to the top inner part of the volute 1, and the top center of the impeller 5 is placed in the slot 6 provided on the inner wall of the upper volute 101.

[0026] The impeller 5 and the rotor 3 are connected by means of interference fit or adhesive bonding.

[0027] The impeller 5 is connected to the motor by either threaded locking or press-fitting, so that if the impeller 5 fails, it can be removed and replaced with a new impeller 5.

[0028] A gap is provided between the assembly of the impeller 5 and the rotor 3 and the central column 2 and the stator 4, so that the assembly of the impeller 5 and the rotor 3 can be suspended between the central column 2 and the stator 4. The gap between the assembly of the impeller 5 and the rotor 3 and the central column 2 and the stator 4 is the air passage 8.

[0029] The air outlet of the impeller 5 and the air outlet of the fan are not on the same plane. This ensures that after the medium is accelerated in the impeller 5, it will not go directly to the air outlet of the fan after passing through the air outlet of the impeller 5. This avoids the medium passing through the air outlet in a pulsating manner, which would cause excessive wind noise from the fan.

[0030] When the fan starts running, some gas will enter the air passage 8, which allows the impeller 5 and rotor 3 to be stably suspended inside the volute 1, thus ensuring stable operation.

[0031] Example 2

[0032] like Figure 2 As shown, with the rest of the structure unchanged, a top post 7 is provided at the center of the upper volute 101, and the bottom of the top post 7 is positioned above the center top of the impeller 5. Embodiment two modifies the constraint on the top position of the impeller 5, allowing the impeller 5 and rotor 3 to be constrained directly by a single top post 7.

[0033] The above method also allows the fan to operate normally, so the top of impeller 5 is not affected. Figure 1 and Figure 2 The limitations shown.

[0034] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A bearingless high-speed centrifugal fan, characterized in that: The system includes a volute (1), which comprises an upper volute (101) and a lower volute (102) connected by an ultrasonic wave, adhesive, or bolts. Inside the volute (1) are a central column (2), a rotor (3), a stator (4), and an impeller (5) connected together. The top center of the impeller (5) is connected to the top center of the volute (1). A top column (7) is located at the center of the upper volute (101), with the bottom of the top column (7) positioned above the top center of the impeller (5). The impeller (5) and the rotor (3) are connected by interference fit or adhesive bonding. There is a gap between the combination of the impeller (5) and the rotor (3) and the central column (2) and the stator (4) so ​​that the combination of the impeller (5) and the rotor (3) can be suspended between the central column (2) and the stator (4). The gap between the combination of the impeller (5) and the rotor (3) and the central column (2) and the stator (4) is an air passage (8). The air outlet of the impeller (5) and the air outlet of the fan are not on the same plane.

2. The bearingless high-speed centrifugal fan according to claim 1, characterized in that: The top center of the impeller (5) is placed in a slot (6) provided on the inner wall of the upper volute (101).

3. The bearingless high-speed centrifugal fan according to claim 1, characterized in that: The volute (1) and the stator (4) are connected by either adhesive or screws.

4. The bearingless high-speed centrifugal fan according to claim 1, characterized in that: The volute (1) is connected to the motor by either screw locking or a snap-fit.

5. The bearingless high-speed centrifugal fan according to claim 1, characterized in that: The impeller (5) is connected to the motor by either threaded locking or press-fitting.

6. The bearingless high-speed centrifugal fan according to claim 1, characterized in that: The stator (4) is fixed to the central column (2) by one of adhesive or screws.

Images