Air suspension blower with air cooling structure and cooling method

Abstract

The air suspension blower with the air cooling structure comprises a stator assembly, a rotor assembly, a volute and a housing, the first end and the second end of a main shaft are provided with a first radial suspension bearing and a second radial suspension bearing respectively, and the two axial ends of the housing are connected with a machine shell and the volute respectively; the first end of the main shaft is further provided with a thrust bearing assembly, a first main shaft cooling cavity and a second main shaft cooling cavity are formed between the two sides of the middle of the main shaft and the first end and between the two sides of the middle of the main shaft and the second end respectively, and the second end of the machine shell is provided with a plurality of machine shell air inlets and a main shaft through hole. A first main shaft radial through hole and a second main shaft radial through hole are formed in the periphery of the first main shaft cooling cavity and the periphery of the second main shaft cooling cavity respectively, a plurality of first axial through holes are formed in the end portion of the first end of the main shaft, a plurality of second axial through holes are formed in the impeller, a bearing seat is arranged in the first end in the machine shell, and a bearing seat hole is formed in the bearing seat. And a housing through hole is formed in the housing.

Description

Technical Field

[0001] This invention relates to the field of fan technology, and in particular to an air-suspended blower with an air-cooled structure and a cooling method thereof. Background Technology

[0002] High-power air-suspended blowers suffer from severe motor heat dissipation issues due to their high motor power density. Coolant circulation is typically used to cool the motor, but this adds to the cooling system, increasing size, cost, and creating new potential points of failure. Some air-cooled structures don't add a cooling impeller to the rotor to draw in cooling air or use an external cooling fan, which further increases overall power consumption and cost. Additionally, while some air-cooled structures don't consume extra power, exposing the impeller's back area to the atmosphere to reduce axial force leads to increased leakage, indirectly increasing power consumption as well. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned shortcomings and defects of the prior art by providing an air-suspended blower with an air-cooled structure and a cooling method to solve the above problems.

[0004] The technical problem solved by this invention can be achieved by the following technical solutions: An air-suspended blower with an air-cooled structure includes a stator assembly, a rotor assembly, a volute, and a casing. The stator assembly includes a housing and a motor stator. The rotor assembly includes a main shaft. A first radial suspension bearing and a second radial suspension bearing are respectively provided at the first and second ends of the main shaft. The first end of the main shaft is connected to an impeller. The two axial ends of the casing are respectively connected to the housing and the volute. A thrust bearing assembly is also provided at the first end of the main shaft. A first main shaft cooling chamber and a second main shaft cooling chamber are respectively provided on both sides of the middle portion of the main shaft between the first and second ends. A plurality of housing air inlets are provided at the second end of the housing. A main shaft through hole communicating with the second main shaft cooling chamber is provided at the second end of the main shaft. The outer periphery of the first main shaft cooling chamber... The outer periphery of the second main shaft cooling chamber is provided with several first main shaft radial through holes and second main shaft radial through holes that communicate with the gap between the motor stator and the main shaft. The first end of the main shaft is provided with several first axial through holes that communicate with the air inlet of the impeller. The impeller is provided with several second axial through holes that communicate with the air inlet of the impeller at intervals around its middle position. The first end of the housing is provided with a bearing seat that mates with the first radial suspension bearing. The bearing seat is provided with a bearing seat hole that communicates with the gap between the motor stator and the main shaft. The cover is provided with a cover through hole. One end of the cover through hole communicates with the volute flow channel, and the other end communicates with one end of the bearing seat flow channel on the bearing seat. The other end of the bearing seat flow channel communicates with the thrust bearing assembly cavity.

[0005] In a preferred embodiment of the present invention, the cover is provided with a plurality of cover ribs, and the cover through holes are provided on the cover ribs.

[0006] In a preferred embodiment of the present invention, the impeller is provided with a plurality of radial through holes spaced apart in the middle circumferentially, so that the air coming out from the first axial through hole and the second axial through hole can enter the air inlet of the impeller through the radial through holes.

[0007] In a preferred embodiment of the present invention, a pressure plate is provided on the bearing housing, the pressure plate assisting in pressing the thrust bearing assembly that cooperates with the first end of the main shaft.

[0008] In a preferred embodiment of the present invention, the first end of the main shaft is fixed to the impeller by a tie rod and a lock nut.

[0009] In a preferred embodiment of the present invention, a gap is left between the first radial suspension bearing, the second radial suspension bearing and the first and second ends of the main shaft.

[0010] In a preferred embodiment of the present invention, a bushing sealing structure is provided between the pressure plate and the bushing, and a bearing seat sealing structure is provided between the pressure plate and the bearing seat.

[0011] In a preferred embodiment of the present invention, the second end of the main shaft is provided with a tapered structure, which can guide the inlet air to the outside of the tapered structure.

[0012] In a preferred embodiment of the present invention, a sealing plate is provided at the end of the volute, and a sealing plate sealing structure is provided between the sealing plate and the impeller.

[0013] In a preferred embodiment of the present invention, the second end of the housing is configured as an arc surface.

[0014] As described in any of the above technical solutions, a cooling method for an air-suspended blower with a wind-cooled structure, during operation, External airflow enters the second end of the motor stator through the air inlet of the housing. Part of the airflow flows into the first end of the motor stator through the gap between the motor stator and the housing, and another part of the airflow flows into the first end of the motor stator through the gap between the motor stator and the rotor, thereby completing the cooling of the inner and outer walls of the motor stator and the outer wall of the main shaft. Then, the airflow at the first end of the motor stator passes through the bearing seat hole and the flow channel between the pressure plate and the cover to reach the impeller inlet end, where it is sucked in by the impeller to do work and then discharged. The airflow channel is relatively smooth and unobstructed, minimizing resistance loss during the flow process. External airflow enters the first end of the motor stator through the gap between the second radial suspension bearing and the second end of the main shaft, and then finally reaches the impeller inlet end, thereby completing the cooling of the second radial suspension bearing; External airflow enters the second main shaft cooling chamber through the main shaft through-hole, then enters the first end of the motor stator through the radial through-hole of the second main shaft, and finally reaches the impeller inlet end, thereby completing the cooling of the second end wall of the main shaft; The high-pressure airflow at the impeller outlet reaches the thrust bearing assembly cavity through the casing through-hole and the bearing seat flow channel. Then, part of it reaches the impeller inlet end through the seal between the pressure plate and the bushing on the side of the thrust bearing assembly cavity near the impeller, thereby cooling the thrust bearing assembly. Another part reaches the first end of the motor stator through the side of the thrust bearing assembly away from the impeller and the first radial suspension bearing clearance, thereby cooling the thrust bearing assembly and the first radial suspension bearing. The airflow at the first end of the motor stator enters the first main shaft cooling chamber through the radial through hole of the first main shaft, and then enters the impeller inlet end through the first axial through hole, the tie rod chamber and the impeller vent hole, thereby completing the cooling of the first end of the main shaft; The high-pressure gas leaking from the impeller back enters the impeller inlet end through the second axial through hole, the tie rod cavity and the impeller vent hole, thus maintaining a low pressure on the impeller back, thereby reducing the rotor axial force and the thrust bearing load.

[0015] By adopting the above technical solution, this invention, through the setting of a special air-cooling structure, enables the motor stator, rotor, and various bearing components to be cooled. This invention has a simple structure, low cost, good cooling effect, no external leakage, small axial force, and high efficiency, which can ensure the efficient and reliable operation of high-power air suspension blowers. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the internal structure of one embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the internal cooling airflow in one embodiment of the present invention.

[0019] Figure 3 yes Figure 2 Enlarged view of point I.

[0020] Figure 4 yes Figure 2 Enlarged view of section II.

[0021] Reference numerals: Stator assembly 100; Housing 110; Housing air inlet 111; Housing cable outlet 112; Arc surface 113; Motor stator 120; Rotor assembly 200; Main shaft 210; Main shaft through hole 211; First axial through hole 212; Conical structure 213; First radial suspension bearing 220; Second radial suspension bearing 230; Impeller 240; Second axial through hole 241; Tie rod 242; Lock nut 243; Impeller inlet end 244; Impeller vent 245; Thrust bearing assembly 250 ; Thrust disc 251; Thrust bearing 252; First spindle cooling chamber 260; First spindle radial through hole 261; Second spindle cooling chamber 270; Second spindle radial through hole 271; Bearing housing 280; Bearing housing hole 281; Bearing housing flow channel 282; Pressure plate 290; Bushing 291; Bushing sealing structure 292; Bearing housing sealing structure 293; Sealing plate sealing structure 294; Volute 300; Volute flow channel 310; Cover 400; Cover through hole 410; Cover stiffener 420; Sealing plate 500. Detailed Implementation

[0022] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0023] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0024] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] See Figures 1 to 4As shown, an air-suspended blower with a wind-cooled structure includes a stator assembly 100, a rotor assembly 200, a volute 300, and a casing 400. The stator assembly 100 includes a housing 110 and a motor stator 120. The housing 110 has a housing outlet hole 112. The rotor assembly 200 includes a main shaft 210. A first radial suspension bearing 220 and a second radial suspension bearing 230 are respectively provided at the first and second ends of the main shaft 210. The first end of the main shaft 210 is connected to an impeller 240. In this embodiment, the first end is closer to the impeller 240, and the second end is farther from the impeller 240. Preferably, the first end of the main shaft 210 is fixed to the impeller 240 by a tie rod 242 and a lock nut 243. The two axial ends of the cover 400 are connected to the housing 110 and the volute 300 respectively. The first end of the main shaft 210 is also provided with a thrust bearing assembly 250, which includes a thrust disk 251 and thrust bearings 252 disposed on both sides of the thrust disk 251.

[0026] A first spindle cooling cavity 260 and a second spindle cooling cavity 270 are respectively provided on both sides of the middle portion of the spindle and between the first end and the second end. Preferably, a left groove and a right groove, as well as a left end shaft and a right end shaft, are respectively provided at both ends of the middle portion of the spindle. The left end shaft and the right end shaft are formed by welding to the middle portion of the spindle. The space enclosed by the middle portion of the spindle, the left groove, and the left end shaft forms the first spindle cooling cavity 260, and the space enclosed by the middle portion of the spindle, the right groove, and the right end shaft forms the second spindle cooling cavity 270.

[0027] The second end of the housing 110 is provided with a plurality of housing air inlets 111, and the second end of the spindle 210 is provided with a spindle through hole 211 communicating with the second spindle cooling chamber 270. The outer periphery of the first spindle cooling chamber 260 and the outer periphery of the second spindle cooling chamber 270 are respectively provided with a plurality of first spindle radial through holes 261 and second spindle radial through holes 271 communicating with the gap between the motor stator 120 and the spindle 210.

[0028] The first end of the main shaft 210 is provided with a plurality of first axial through holes 212 communicating with the air inlet of the impeller 240. The impeller 240 is provided with a plurality of second axial through holes 241 communicating with the air inlet of the impeller at intervals around the middle. The first end of the housing 110 is provided with a bearing seat 280 that cooperates with the first radial suspension bearing 220. The bearing seat 280 is provided with a bearing seat hole 281 communicating with the gap between the motor stator 120 and the main shaft 210. The cover 400 is provided with a cover through hole 410. One end of the cover through hole 410 is connected to the volute flow channel 310, and the other end is connected to one end of the bearing seat flow channel 282 on the bearing seat 280. The other end of the bearing seat flow channel 282 is connected to the thrust bearing assembly cavity.

[0029] In this embodiment, the cover 400 is provided with a plurality of cover stiffeners 420, and the cover through hole 410 is provided on the cover stiffeners 420. The cover stiffeners 420 can not only increase the strength of the cover 400, but also serve as the carrier for the cover through hole 410.

[0030] A pressure plate 290 is provided on the bearing housing 280. The pressure plate 290 assists in pressing the thrust bearing assembly 250 that is engaged with the first end of the main shaft 210. The outer end face of the pressure plate 290 is a smooth arc transition curve.

[0031] The first radial suspension bearing 220 and the second radial suspension bearing 230 are separated from the first and second ends of the main shaft 210 by gaps, which allow airflow to pass through for air cooling.

[0032] A bushing sealing structure 292 is provided between the pressure plate 290 and the bushing 291, and a bearing housing sealing structure 293 is provided between the pressure plate 290 and the bearing housing 280. A sealing plate 500 is provided at the end of the volute 300, and a sealing plate sealing structure 294 is provided between the sealing plate 500 and the impeller 240. The sealing plate sealing structure 294 is sealed with the impeller to prevent high-pressure gas in the impeller area from leaking into the impeller back cavity. Both the bushing sealing structure 292 and the sealing plate sealing structure 294 are sparse tooth sealing structures, and the bearing housing sealing structure 293 is a sealing ring.

[0033] The second end of the main shaft 210 is provided with a tapered structure 213, which can guide the inlet air to the outside of the tapered structure. The second end of the housing 110 is provided with an arc surface 113.

[0034] A cooling method for an air-suspended blower with an air-cooled structure, during operation, External airflow enters the second end of the motor stator 120 through the air inlet 111 of the housing. Part of the airflow flows into the first end of the motor stator 120 through the gap between the motor stator 120 and the housing 110, and another part of the airflow flows into the first end of the motor stator 120 through the gap between the motor stator 120 and the rotor, thereby completing the cooling of the inner and outer walls of the motor stator 120 and the outer wall of the main shaft 210. Then, the airflow at the first end of the motor stator 120 passes through the bearing seat hole 281 and the flow channel between the pressure plate 290 and the cover 400 to reach the impeller inlet 244, where it is sucked in by the impeller to do work and then discharged. The airflow channel is relatively smooth and unobstructed, minimizing resistance loss during the flow process. External airflow passes through the gap between the second radial suspension bearing 230 and the second end of the main shaft 210, enters the first end of the motor stator 120, and finally reaches the impeller inlet end 244, thereby completing the cooling of the second radial suspension bearing 230. External airflow enters the second main shaft cooling chamber 270 through the main shaft through hole 211, then enters the first end of the motor stator 120 through the second main shaft radial through hole 271, and finally reaches the impeller inlet end 244, thereby completing the cooling of the second end wall of the main shaft. The high-pressure airflow at the impeller outlet reaches the thrust bearing assembly cavity through the casing through hole 410 and the bearing seat flow channel 282. Then, part of it reaches the impeller inlet end 244 through the seal between the pressure plate 290 and the bushing 291 on the side of the thrust bearing assembly cavity near the impeller, thereby cooling the thrust bearing assembly 250. Another part reaches the first end of the motor stator 120 through the side of the thrust bearing assembly 250 away from the impeller and the gap of the first radial suspension bearing 220, thereby cooling the thrust bearing assembly 250 and the first radial suspension bearing 220. The airflow at the first end of the motor stator 120 enters the first main shaft cooling chamber 260 through the first main shaft radial through hole 261, and then enters the impeller inlet end 244 through the first axial through hole 212, the tie rod chamber and the impeller vent hole 245, thereby completing the cooling of the first end of the main shaft 210. The high-pressure gas leaking from the impeller back enters the impeller inlet end 244 through the second axial through hole 241, the tie rod cavity and the impeller vent hole 245, thus maintaining a low pressure on the impeller back, thereby reducing the rotor axial force and the thrust bearing load.

[0035] Figures 2 to 4 The direction indicated by the middle arrow is the airflow direction.

[0036] This invention features a special air-cooling structure that allows the motor stator, rotor, and all bearing components to be cooled. The invention is simple in structure, low in cost, has a good cooling effect, no external leakage, low axial force, and high efficiency, ensuring the efficient and reliable operation of a high-power air-suspended blower.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0038] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0039] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An air-suspended blower with an air-cooled structure, comprising a stator assembly, a rotor assembly, a volute, and a casing, characterized in that, The stator assembly includes a housing and a motor stator. The rotor assembly includes a main shaft. A first radial suspension bearing and a second radial suspension bearing are respectively provided at the first and second ends of the main shaft. The first end of the main shaft is connected to an impeller. The two axial ends of the casing are respectively connected to the housing and the volute. A thrust bearing assembly is also provided at the first end of the main shaft. A first main shaft cooling cavity and a second main shaft cooling cavity are respectively provided on both sides of the middle part of the main shaft between the first and second ends. A plurality of housing air inlets are provided at the second end of the housing. A main shaft through hole communicating with the second main shaft cooling cavity is provided at the second end of the main shaft. A plurality of... The main shaft has a first radial through hole and a second radial through hole that communicate with the gap between the motor stator and the main shaft. The first end of the main shaft is provided with several first axial through holes that communicate with the air inlet of the impeller. The impeller is provided with several second axial through holes that communicate with the air inlet of the impeller at circumferential intervals near the middle. The first end of the housing is provided with a bearing seat that mates with the first radial suspension bearing. The bearing seat is provided with a bearing seat hole that communicates with the gap between the motor stator and the main shaft. The cover is provided with a cover through hole. One end of the cover through hole communicates with the volute flow channel, and the other end communicates with one end of the bearing seat flow channel on the bearing seat. The other end of the bearing seat flow channel communicates with the thrust bearing assembly cavity.

2. The air-suspended blower with an air-cooled structure according to claim 1, characterized in that, The cover is provided with a plurality of cover ribs, and the cover through holes are provided on the cover ribs.

3. The air-suspended blower with an air-cooled structure according to claim 1, characterized in that, The impeller has several radial through holes spaced circumferentially in the middle, so that the air coming out from the first axial through hole and the second axial through hole can enter the air inlet of the impeller through the radial through holes.

4. The air-suspended blower with an air-cooled structure according to claim 1, characterized in that, A pressure plate is provided on the bearing housing, which assists in pressing the thrust bearing assembly that mates with the first end of the main shaft.

5. The air-suspended blower with an air-cooled structure according to claim 1, characterized in that, A bushing sealing structure is provided between the pressure plate and the bushing, and a bearing seat sealing structure is provided between the pressure plate and the bearing seat.

6. The air-suspended blower with an air-cooled structure according to claim 1, characterized in that, The second end of the main shaft is provided with a tapered structure, which can guide the inlet air to the outside of the tapered structure.

7. The air-suspended blower with an air-cooled structure according to claim 1, characterized in that, The end of the volute is provided with a sealing plate, and a sealing structure is provided between the sealing plate and the impeller.

8. The air-suspended blower with an air-cooled structure according to claim 1, characterized in that, The second end of the casing is set as an arc surface.

9. A cooling method for an air-suspended blower with an air-cooled structure according to any one of claims 1-8, characterized in that, At work, External airflow enters the second end of the motor stator through the air inlet of the housing. Part of the airflow flows into the first end of the motor stator through the gap between the motor stator and the housing, and another part of the airflow flows into the first end of the motor stator through the gap between the motor stator and the rotor, thereby completing the cooling of the inner and outer walls of the motor stator and the outer wall of the main shaft. Then, the airflow at the first end of the motor stator passes through the bearing seat hole and the flow channel between the pressure plate and the cover to reach the impeller inlet end, where it is sucked in by the impeller to do work and then discharged. The airflow channel is relatively smooth and unobstructed, minimizing resistance loss during the flow process. External airflow enters the first end of the motor stator through the gap between the second radial suspension bearing and the second end of the main shaft, and then finally reaches the impeller inlet end, thereby completing the cooling of the second radial suspension bearing; External airflow enters the second main shaft cooling chamber through the main shaft through-hole, then enters the first end of the motor stator through the radial through-hole of the second main shaft, and finally reaches the impeller inlet end, thereby completing the cooling of the second end wall of the main shaft; The high-pressure airflow at the impeller outlet reaches the thrust bearing assembly cavity through the casing through-hole and the bearing seat flow channel. Then, part of it reaches the impeller inlet end through the seal between the pressure plate and the bushing on the side of the thrust bearing assembly cavity near the impeller, thereby cooling the thrust bearing assembly. Another part reaches the first end of the motor stator through the side of the thrust bearing assembly away from the impeller and the first radial suspension bearing clearance, thereby cooling the thrust bearing assembly and the first radial suspension bearing. The airflow at the first end of the motor stator enters the first main shaft cooling chamber through the radial through hole of the first main shaft, and then enters the impeller inlet end through the first axial through hole, the tie rod chamber and the impeller vent hole, thereby completing the cooling of the first end of the main shaft; The high-pressure gas leaking from the impeller back enters the impeller inlet end through the second axial through hole, the tie rod cavity and the impeller vent hole, thus maintaining a low pressure on the impeller back, thereby reducing the rotor axial force and the thrust bearing load.

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