Air suspension centrifugal fan

Abstract

The utility model provides an air suspension centrifugal fan which comprises a machine shell, a motor stator, a rotor assembly, an impeller and an air suspension assembly, the air suspension assembly comprises two air suspension thrust bearings and a thrust disc, and the thrust disc is fixedly installed on the rotor assembly. The two air suspension thrust bearings are arranged on the two sides of the thrust disc correspondingly, and the two air suspension thrust bearings and the thrust disc are arranged at intervals. The air suspension thrust bearing comprises an annular base and an annular thrust disc buffering part arranged on the side, close to the thrust disc, of the annular base, and a rotor assembly via hole is formed in the center of the annular base. And the thrust disc buffer part is obliquely arranged on the annular base in the circumferential direction of the rotor assembly via hole, and the annular thrust disc buffer part enables the air suspension thrust bearing to have high bearing capacity.

Description

Technical Field

[0001] The present application relates to the field of air suspension blowers, and in particular to an air suspension centrifugal blower. Background Art

[0002] Air suspension blowers eliminate the gear transmission and oily bearings of traditional blowers. Compared with traditional blowers, air suspension bearings use air as a lubricant, which requires no lubricating oil and mechanical maintenance. They can simplify the structure of the bearings and effectively reduce users' subsequent maintenance costs.

[0003] However, the existing air suspension fans have the following disadvantages: when the air suspension thrust bearing limits the axial movement of the thrust plate, the air suspension thrust bearing is easily deformed and damaged. Utility Model Content

[0004] The purpose of the present application is to provide an air-suspended centrifugal fan with an air-suspended thrust bearing having a relatively high load-bearing capacity.

[0005] An air suspension centrifugal fan, characterized in that it comprises: a casing, a motor stator, a rotor assembly, an impeller, and an air suspension assembly, wherein the casing, the motor stator, and the rotor assembly are sequentially sleeved, and both ends of the rotor assembly are rotatably connected to the casing through the air suspension assembly, and the impeller is fixedly mounted on one end of the rotor assembly; the air suspension assembly comprises: two air suspension thrust bearings and a thrust plate, the thrust plate is fixedly mounted on the rotor assembly, and the two air suspension thrust bearings are respectively arranged on both sides of the thrust plate and are spaced apart from the thrust plate;

[0006] The air suspension thrust bearing includes an annular base and an annular thrust disk buffer portion arranged on the side of the annular base close to the thrust disk, and a rotor assembly through hole is arranged at the center of the annular base; the thrust disk buffer portion is arranged on the annular base at an angle along the circumferential direction of the rotor assembly through hole.

[0007] Compared with the prior art, the annular thrust disc buffer part is provided on the annular base near the side of the thrust disc, and the thrust disc buffer part is provided on the annular base in an inclined manner along the direction from the rotor assembly through hole to the edge of the annular base. Compared with the conventional air suspension thrust bearing, by providing the annular thrust disc buffer part, when the air suspension thrust bearing limits the axial movement of the thrust disc, the annular thrust disc buffer part can play a good buffering role, effectively reducing the loss caused to the annular base, and can have the characteristics of large load-bearing capacity, long service life, high reliability, etc.

[0008] Furthermore, the annular base and the annular thrust plate buffer portion are integrally formed.

[0009] Furthermore, the thrust plate buffer portion includes a circular tension foil; the circular tension foil is arranged on a side of the circular base close to the thrust plate at an inclination angle of 1 to 2 degrees.

[0010] Furthermore, the thrust plate buffer portion includes a plurality of fan-shaped tensioning foils, with gaps left between each of the fan-shaped tensioning foils. The plurality of fan-shaped tensioning foils are arranged at an inclination angle of 1 to 2 degrees on one side of the annular base close to the thrust plate, and are symmetrically arranged at the center of the rotor assembly through hole.

[0011] Furthermore, the annular base is provided with a plurality of equidistant and radially arranged cutouts with the rotor assembly through hole as the center, and the cutouts correspond one-to-one to the gaps between the fan-shaped tensioning foils.

[0012] Furthermore, the number of the gaps between the cutouts and the fan-shaped tensioning foils is 8.

[0013] In order to provide a clearer understanding of the present application, the specific implementation of the present application will be described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of an air suspension centrifugal fan for this application;

[0015] Figure 2 This is a cross-sectional schematic diagram of an air suspension centrifugal fan of the present application;

[0016] Figure 3 A partial exploded schematic diagram of an air-suspended thrust bearing and a thrust plate in an air-suspended centrifugal fan of the present application;

[0017] Figure 4 A partial exploded schematic diagram of a thrust disc and a thrust disc buffer portion of an air suspension thrust bearing in an air suspension centrifugal fan of the present application being a circular ring-shaped tension foil;

[0018] Figure 5 A partial exploded schematic diagram of a thrust disc in an air suspension centrifugal fan and a thrust disc buffer portion of an air suspension thrust bearing as a fan-shaped tensioning foil in the present application;

[0019] Figure 6 A partial exploded schematic diagram of an air suspension thrust bearing, a thrust plate, a first air suspension radial bearing and a first shield in an air suspension centrifugal fan of the present application;

[0020] Figure 7 A partial explosion diagram of a second air suspension radial bearing, a second protective cover and a heat dissipation cover in an air suspension centrifugal fan of the present application. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present application. It is understood that the drawings are only provided for reference and illustration, and are not used to limit the present application. The connection relationship shown in the drawings is only for the convenience of clear description and does not limit the connection method.

[0023] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be an intermediate component at the same time. Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as those generally understood by technicians in the technical field to which this application belongs. It should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or the internal connection of two components. For ordinary technicians in this field, the above terms can be understood in specific circumstances in this utility model.

[0024] The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0025] It should also be noted that in the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] See also Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the structure of an air suspension centrifugal fan for this application; Figure 2This is a cross-sectional schematic diagram of an air suspension centrifugal fan of the present application; Figure 3 A partial explosion diagram of an air-suspended thrust bearing and a thrust plate in an air-suspended centrifugal fan of the present application.

[0027] The present application provides an air suspension centrifugal fan 1, comprising: a casing 101, a motor stator 102, a rotor assembly 103, an impeller 104, and an air suspension assembly 105, wherein the casing 101, the motor stator 102, and the rotor assembly 103 are sequentially sleeved, and both ends of the rotor assembly 103 are rotatably connected to the casing 101 through the air suspension assembly 105, and the impeller 104 is fixedly installed on one end of the rotor assembly 103; the air suspension assembly 105 comprises: two air suspension thrust bearings 105a and a thrust plate 105b, wherein the thrust plate 105b is fixedly installed on the rotor assembly 103, and the two air suspension thrust bearings 105a are respectively arranged on both sides of the thrust plate 105b, and are arranged adjacent to the thrust plate 105b.

[0028] The air suspension thrust bearing 105a includes an annular base 105d and an annular thrust disk buffer portion 105f arranged on the side of the annular base 105d close to the thrust disk 105b, and a rotor assembly through hole 105e is arranged at the center of the annular base 105d; the inner diameter of the thrust disk buffer portion 105f is equal to the inner diameter of the annular base 105d, and the outer diameter of the thrust disk buffer portion 105f is smaller than the outer diameter of the annular base 105d; the thrust disk buffer portion 105f is obliquely arranged on the annular base 105d along the circumferential direction of the rotor assembly through hole 105e. In this embodiment, the thrust disc buffer portion 105f is uniformly arranged on the annular base 105d in a clockwise direction along the circumference of the rotor assembly through hole 105e, and the thrust disc buffer portion 105f is arranged on the annular base 105d at an inclination angle of 1 to 2 degrees along the direction from the rotor assembly through hole 105e to the edge of the annular base 105d, preferably at an inclination angle of 2 degrees. Of course, in other embodiments, according to the actual structure, the inclination angle of the annular thrust disc buffer portion 105f arranged on the annular base 105d can be adaptively adjusted; the thrust disc buffer portion 105f can also be uniformly arranged on the annular base 105d in a counterclockwise direction along the circumference of the rotor assembly through hole 105e.

[0029] In the air suspension fan 1, after the rotor assembly 103 reaches a certain rotation speed, a layer of high-pressure air film is formed between the air suspension assembly 105 and the rotor assembly 103, so that the rotor assembly 103 is suspended on the air film and rotates at high speed. A circular thrust disc buffer 105f is provided on the side of the air suspension thrust bearing 105a close to the thrust disc 105b, and the circular thrust disc buffer 105f is provided on the circular base 105d at an inclination angle of 1 to 2 degrees. Compared with the traditional air suspension thrust bearing, by providing the circular thrust disc buffer 105f, when the air suspension thrust bearing 105a limits the axial movement of the thrust disc 105b, the circular thrust disc buffer 105f can play a buffering role, effectively reducing the loss caused to the circular base 105d, and can have the characteristics of large bearing capacity, long service life, high reliability, etc.

[0030] See also Figure 4 , Figure 4 This is a partial exploded schematic diagram of a thrust disc and a thrust disc buffer of an air-suspended thrust bearing in an air-suspended centrifugal fan of the present application, which is a circular tension foil. In this embodiment, the thrust disc buffer 105f also includes a circular tension foil 105g, the inner diameter of the circular tension foil 105g is equal to the inner diameter of the circular base 105d, and the outer diameter of the circular tension foil 105g is smaller than the outer diameter of the circular base 105d; the circular tension foil 105g is arranged on the side of the circular base 105d close to the thrust disc 105b at an inclination angle of 1 to 2 degrees. Of course, in other embodiments, the circular base 105d can also be integrally formed with the circular thrust disc buffer 105f; according to the actual buffering requirements of the thrust disc 105b, the inclination angle of the circular tension foil 105g arranged on the circular base 105d can be adaptively adjusted.

[0031] When the air suspension fan 1 provided by the present application starts to operate, as the rotor assembly 103 rotates at a high speed, the rotation speed of the thrust disc 105b also starts to increase, and a layer of air film is formed between the annular tension foil 105g and the thrust disc 105b. Due to the viscosity of the gas, the gas will rotate with the thrust disc 105b, and the movement of the gas will produce a dynamic pressure effect, forming a pressure gradient in the air film. This pressure gradient enables the air suspension thrust bearing 105a to withstand the axial load from the thrust disc 105b. By setting the annular tension foil 105g at an inclination angle of 1 to 2 degrees on one end of the annular base 105d close to the thrust disc 105b, the dynamic pressure effect generated by the gas movement is enhanced, and the axial load capacity of the air suspension thrust bearing 105a on the thrust disc 105b is improved.

[0032] In addition, by setting the annular tension foil 105g at an inclination angle of 1 to 2 degrees on one end of the annular base 105d close to the thrust disk 105b, the elastic characteristics of the annular tension foil 105g are enhanced, and the annular tension foil 105g will adjust its shape and position accordingly under the action of the air film pressure to maintain the stable operation of the air suspension thrust bearing 105a. When the air suspension thrust bearing 105a restricts the axial movement of the thrust disk 105b, the annular tension foil 105g can play a buffering role, effectively reducing the loss caused by the thrust disk 105b to the annular base 105d.

[0033] In another embodiment, see Figure 5 , Figure 5 This is a partial exploded schematic diagram of a thrust disc and a thrust disc buffer of an air suspension thrust bearing in an air suspension centrifugal fan of the present application, which is a fan-shaped tensioning foil. The thrust disc buffer 105f also includes a plurality of fan-shaped tensioning foils 105h, the number of which is 8, and there is a gap between each of the fan-shaped tensioning foils 105h. The plurality of fan-shaped tensioning foils 105h are arranged at an inclination angle of 1 to 2 degrees on one side of the annular base 105d close to the thrust disc 105b, and the fan-shaped tensioning foils 105h are symmetrically arranged at the center of the rotor assembly through hole 105e.

[0034] The annular base 105d is provided with a plurality of equidistant and radially arranged cutouts 105i with the rotor assembly through hole 105e as the center, and the cutouts 105i correspond to the gaps between the fan-shaped tensioning foils 105h one by one, and the number of the cutouts 105i is 8. In other embodiments, the number of the fan-shaped tensioning foils 105h can be adaptively adjusted, and the number of the cutouts 105i can be adjusted accordingly.

[0035] By providing gaps between the plurality of fan-shaped tensioning foils 105h and providing the cutout 105i on the annular base 105d, space is reserved for the annular tensioning foil 105g and the annular base 105d to deform due to heat, and they are not easily damaged.

[0036] See also Figure 6 and Figure 7 , Figure 6 A partial exploded schematic diagram of an air suspension thrust bearing, a thrust plate, a first air suspension radial bearing and a first shield in an air suspension centrifugal fan of the present application; Figure 7 A partial explosion diagram of a second air suspension radial bearing, a second protective cover and a heat dissipation cover in an air suspension centrifugal fan of the present application.

[0037] In this embodiment, the air suspension fan 1 further includes a first shield 106 and a second shield 107, one end of the first shield 106 and the second shield 107 are respectively assembled at the two ends of the housing 101, and the first shield 106 is provided with an air suspension thrust bearing mounting portion 106a and a first air suspension radial bearing mounting portion 106c in sequence in a direction away from the impeller 104. The second shield 107 is provided with a second air suspension radial bearing mounting portion 107a. The outer ring of the annular base 105d is provided with a plurality of superior arc-shaped notches 105l, and the superior arc-shaped notches 105l are arranged at equal intervals along the outer ring of the annular base 105d. The air suspension thrust bearing mounting portion 106a is a screw hole corresponding to the superior arc-shaped notch 105l, and the screw is screwed into the superior arc-shaped notch 105l and the air suspension thrust bearing mounting portion 106a, so that the two air suspension thrust bearings 105a are installed in the first shield 106.

[0038] In other embodiments, in order to improve the stability of the fixed assembly of the two air suspension thrust bearings 105a, the two air suspension thrust bearings 105a can also be fixedly assembled by bolts.

[0039] In one embodiment, the air suspension assembly 105 further includes a first air suspension radial bearing 105j and a second air suspension radial bearing 105k, and the first air suspension radial bearing 105j and the second air suspension radial bearing 105k are respectively mounted on the first air suspension radial bearing mounting portion 106c and the second air suspension radial bearing mounting portion 107a, so as to be respectively mounted in the first shield 106 and the second shield 107. The first air suspension radial bearing 105j is mounted between the air suspension thrust bearing 105a and the motor stator 102, and the first air suspension radial bearing 105j is arranged adjacent to the air suspension thrust bearing 105a. Of course, in other embodiments, the first air suspension radial bearing 105j and the air suspension thrust bearing 105a may not be arranged adjacent to each other, but other structures such as a cooling structure may be arranged in the middle.

[0040] The rotor assembly 103 includes a motor shaft 103a, a first bearing shaft 103b and a second bearing shaft 103c. The motor shaft 103a passes through the motor stator 102 and is coaxially fixedly connected with the first bearing shaft 103b and the second bearing shaft 103c respectively; the first bearing shaft 103b passes through the first air suspension radial bearing 105j and the air suspension thrust bearing 105a, and is installed with the impeller 104; the second bearing shaft 103c passes through the second air suspension radial bearing 105k.

[0041] When the first bearing shaft 103b and the second bearing shaft 103c reach a certain rotation speed, a layer of high-pressure air film is formed between the first air-suspended radial bearing 105j and the first bearing shaft 103b, so that the first bearing shaft 103b is stably suspended in the first air-suspended radial bearing 105j and rotates at high speed under the action of the high-pressure air film. Similarly, the second bearing shaft 103c is stably suspended in the second air-suspended radial bearing 105k and rotates at high speed. When the first bearing shaft 103b or the second bearing shaft 103c is damaged and needs to be replaced, only the first bearing shaft 103b or the second bearing shaft 103c needs to be replaced accordingly, without replacing the entire rotor assembly 103, which effectively reduces costs.

[0042] In this embodiment, the air suspension assembly 1 further includes a heat dissipation assembly 108, which includes a heat dissipation fan 108a and a heat dissipation cover 108b. The heat dissipation cover 108b is assembled at one end of the second shield 107 away from the first shield 106, and the heat dissipation cover 108b is provided with an air outlet 108c. The second bearing shaft 103c passes through the second air suspension radial bearing 105k and is installed with the heat dissipation fan 108a; a ventilation duct is formed between the motor stator 102 and the rotor assembly 103; at least one air inlet 101a connected to the ventilation duct is provided on the housing 101, and the air inlet 101a is elliptical in shape, preferably 4 in number, and the 4 air inlets 101a are symmetrically arranged along the axial center line of the housing 101; the air inlet 101a is arranged on one end of the housing 101 away from the heat dissipation fan 108a; the air inlet 101a, the ventilation duct and the air outlet 108c form a heat dissipation channel. In other embodiments, the number and shape of the air inlet 101a can be adaptively adjusted according to actual heat dissipation requirements.

[0043] In the air suspension fan 1, when the first bearing shaft 103b and the second bearing shaft 103c are stably suspended in the first air suspension radial bearing 105j and the second air suspension radial bearing 105k respectively, the motor shaft 103a is also suspended in the motor stator 102 and forms the ventilation duct 102a between the motor stator 102 and the motor stator 102. By providing at least one air inlet 101a connected to the ventilation duct on the casing 101, when the air suspension fan 1 is in operation, the heat dissipation fan 108a rotates at a high speed, which makes the air pressure outside the casing 101 at the air inlet 101a greater than the air pressure inside the casing 101, and the wind flows into the air suspension fan 1 from the air inlet 101a, and flows in the ventilation duct 102a formed between the motor stator 102 and the rotor assembly 103, and finally flows out from the air outlet 107i, thereby taking away the heat generated by the motor stator 102 and the motor shaft 103a during use, and completing the air cooling and heat dissipation of the motor stator 102 and the motor shaft 103a.

[0044] In this embodiment, the air suspension fan 1 further includes a volute 109 , which is closely attached to an end of the first shield 106 away from the casing 101 and is detachably assembled with the first shield 106 . The impeller 104 is disposed in the volute 109 .

[0045] In one embodiment, the air suspension assembly 105 further includes a second thrust plate 105m, which is disposed on the second bearing shaft 103c, and the sum of the products of the weight of each of the first bearing shaft 103b, the thrust plate 105b and the impeller 104 and the distance from their center of mass to the center position of the motor shaft 103a is equal to the sum of the products of the weight of each of the second bearing shaft 103c, the cooling fan 107a and the second thrust plate 105m and the distance from their center of mass to the center position of the motor shaft 103a.

[0046] The present application is not limited to the above-mentioned implementation modes. If various changes or modifications to the present application do not depart from the spirit and scope of the present application, and if these changes and modifications fall within the claims of the present application and the scope of equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. An air suspension centrifugal fan, characterized in that: include: A casing, a motor stator, a rotor assembly, an impeller, and an air suspension assembly, wherein the casing, the motor stator, and the rotor assembly are sequentially sleeved, and both ends of the rotor assembly are rotatably connected to the casing through the air suspension assembly, and the impeller is fixedly mounted on one end of the rotor assembly; the air suspension assembly comprises: two air suspension thrust bearings and a thrust plate, wherein the thrust plate is fixedly mounted on the rotor assembly, and the two air suspension thrust bearings are respectively arranged on both sides of the thrust plate and are spaced apart from the thrust plate; The air suspension thrust bearing includes an annular base and an annular thrust disk buffer portion arranged on the side of the annular base close to the thrust disk, and a rotor assembly through hole is arranged at the center of the annular base; the thrust disk buffer portion is arranged on the annular base at an angle along the circumferential direction of the rotor assembly through hole.

2. The air suspension centrifugal fan according to claim 1, characterized in that: The annular base and the thrust plate buffer portion are integrally formed.

3. The air suspension centrifugal fan according to claim 1, characterized in that: The thrust plate buffer portion comprises a circular ring-shaped tensioning foil; the circular ring-shaped tensioning foil is arranged at a side of the circular ring-shaped base close to the thrust plate at an inclination angle of 1 to 2 degrees.

4. The air suspension centrifugal fan according to claim 1, characterized in that: The thrust plate buffer portion includes a plurality of fan-shaped tensioning foils, each of which has a gap therebetween. The plurality of fan-shaped tensioning foils are arranged at an inclination angle of 1 to 2 degrees on one side of the annular base close to the thrust plate, and are symmetrically arranged at the center of the rotor assembly through hole.

5. The air suspension centrifugal fan according to claim 4, characterized in that: The annular base is provided with a plurality of equidistant and radially arranged cutouts with the rotor assembly through hole as the center, and the cutouts correspond one to one with the gaps between the fan-shaped tensioning foils.

6. The air suspension centrifugal fan according to claim 5, characterized in that: The number of the cutouts and the number of the gaps between the fan-shaped tensioning foils are both eight.

7. The air suspension centrifugal fan according to claim 1, characterized in that: It also includes a first shield and a second shield. One end of the first shield and the second shield are respectively assembled at two ends of the casing, and the two air suspension thrust bearings are fixedly installed in the first shield.

8. The air suspension centrifugal fan according to claim 7, characterized in that: The air suspension component also includes a first air suspension radial bearing and a second air suspension radial bearing, the first air suspension radial bearing and the second air suspension radial bearing are respectively installed in the first shield and the second shield, and the first air suspension radial bearing is installed between the air suspension thrust bearing and the motor stator; the rotor assembly includes a motor shaft, a first bearing shaft and a second bearing shaft, and the two ends of the motor shaft pass through the motor stator and are coaxially fixedly connected with the first bearing shaft and the second bearing shaft respectively; the first bearing shaft passes through the first air suspension radial bearing and the air suspension thrust bearing, and is installed with the impeller; the second bearing shaft passes through the second air suspension radial bearing.

9. The air suspension centrifugal fan according to claim 8, characterized in that: Also includes: A heat dissipation component, the heat dissipation component comprising: a heat dissipation fan and a heat dissipation cover, the heat dissipation cover is assembled to an end of the second cover away from the first cover, and the heat dissipation cover is provided with an air outlet; The second bearing shaft is installed with the heat dissipation fan after passing through the second air suspension radial bearing, and a ventilation duct is formed between the motor stator and rotor assembly; at least one air inlet connected to the ventilation duct is arranged on the casing; the air inlet is arranged on one end of the casing away from the heat dissipation fan; the air inlet, the ventilation duct and the air outlet form a heat dissipation channel.

10. The air suspension centrifugal fan according to claim 7, characterized in that: It also includes a volute, which is closely attached to one end of the first shield away from the casing and is detachably assembled with the first shield, and the impeller is arranged in the volute.

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