CN213981244U - Air suspension centrifugal blower - Google Patents
Air suspension centrifugal blower Download PDFInfo
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- CN213981244U CN213981244U CN202022068926.8U CN202022068926U CN213981244U CN 213981244 U CN213981244 U CN 213981244U CN 202022068926 U CN202022068926 U CN 202022068926U CN 213981244 U CN213981244 U CN 213981244U
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Abstract
本实用新型公开了一种空气悬浮离心鼓风机，其通过在电机的前后两端分别设计离心鼓风部分和排风散热部分，相应的转动部件均由空气悬浮轴承支撑旋转，电机启动时，离心鼓风部分能够实现大功率供风，且具有供气量大、运行平稳、效率高、噪音低、无需润滑和气体不会被油二次污染等优点；同时，排风散热部分在第二叶轮的牵引作用下，将冷空气从电机壳上进气孔吸入，被吸入的冷空气在电机内部沿轴向流动，并带着电机工作时所产生的热量依次经第二法兰上的通气孔、第二蜗壳的叶轮腔和排热通道排出外界，从而使电机得到充分的冷却，满足高温下正常运行；此外，在排热的过程中，气流能够携带机内的灰尘排出，有效防止灰尘进入轴承而造成磨损。
The utility model discloses an air suspension centrifugal blower. By designing a centrifugal blower part and an air exhaust heat dissipation part at the front and rear ends of a motor, the corresponding rotating parts are supported and rotated by air suspension bearings. When the motor starts, the centrifugal blower The air part can achieve high-power air supply, and has the advantages of large air supply, stable operation, high efficiency, low noise, no need for lubrication and no secondary pollution of gas by oil; Under the action of traction, the cold air is sucked from the air inlet hole on the motor shell, and the sucked cold air flows along the axial direction inside the motor, and carries the heat generated when the motor works through the ventilation holes on the second flange, the second flange. The impeller cavity and heat exhaust channel of the two volutes are discharged to the outside world, so that the motor can be fully cooled to meet the normal operation at high temperature; in addition, in the process of heat exhaustion, the airflow can carry the dust in the machine to discharge, effectively preventing dust from entering the bearing cause wear.
Description
Technical Field
The utility model belongs to the technical field of centrifuge, especially, relate to an air suspension centrifugal blower.
Background
At present, for roots blower, centrifugal blower is in stepping up, the flow parameter aspect selection scope is wider, has characteristics such as efficient, the noise is low, operate steadily, and the range of application covers traditional heavy chemical industry fields such as petrochemical industry and chemical industry, metal smelting, thermal power, cement manufacturing and novel environmental protection fields such as sewage treatment, waste heat recovery, SOx/NOx control.
The traditional high-speed and low-speed centrifugal blower is composed of a blower head, a lubricating oil system, a cooling system, a driving motor, a speed regulating device, an adjusting control system, an electrical control system and the like, and is complex in structure, high in failure rate, large in later maintenance workload, high in maintenance cost, and easy to cause leakage of lubricating oil and grease, and pollution to the environment and compressed air.
The magnetic suspension centrifugal blower adopts a magnetic suspension bearing technology, so that a complex gear box and an oil bearing which are required by the traditional blower are omitted, no lubricating oil and no mechanical maintenance are realized, the later maintenance cost of a user is effectively reduced, but the magnetic suspension bearing is complex in control structure, high in failure rate and high in price. And when the magnetic suspension bearing suddenly loses efficacy, the rotor rotating at high speed falls off to cause equipment damage, a set of rolling bearing is generally additionally needed to serve as a protective bearing, the structure is very complex, and the impact problem when the rotor suddenly falls off is difficult to be fundamentally solved.
The air suspension bearing uses air as a lubricant, the air has small viscosity as the lubricant, has stable chemical performance compared with liquid in a wide temperature range, does not need the sealing of a main shaft, cancels equipment required for storing, heating, cooling, pressing in and pumping out the liquid lubricant, simplifies the structure of the bearing, reduces the cost of the bearing, reduces vibration and noise, keeps the compressed medium free from pollution and the like, and is widely applied to the blower industry in recent years. However, the heat dissipation structure of the existing air suspension centrifugal blower is generally that heat dissipation fins are additionally arranged on a motor casing or heat dissipation holes are formed in the motor casing, the heat dissipation structure is natural in heat dissipation, poor in heat dissipation effect, capable of reducing the service life of the centrifugal blower when working at a high temperature for a long time, and capable of leading dust to enter a blower body and easily wearing a bearing due to the design of the heat dissipation holes.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a compact structure, radiating effect are good, longe-lived, the good air suspension centrifugal blower of stability.
In order to achieve the above object, the present invention provides an air suspension centrifugal blower, comprising a motor, a first volute, a second volute, a first impeller, a second impeller, a first impeller shaft, a second impeller shaft, a first bearing rotating shaft, a second bearing rotating shaft, a first bearing assembly and a second bearing assembly, wherein the motor comprises a motor casing, a motor rotor and a motor stator, and the front and rear ends of the motor casing are respectively provided with a first flange and a second flange;
the first volute is mounted on the first flange through a diffuser, the first impeller is arranged in an impeller cavity of the first volute and is coaxially connected with the motor rotor through the first impeller shaft, a sealing ring is arranged between the first impeller and the diffuser, an air inlet channel and an air exhaust channel are arranged on the first volute, and the air inlet channel, the impeller cavity of the first volute and the air exhaust channel are sequentially communicated;
the second volute is mounted on the second flange, the second impeller is arranged in an impeller cavity of the second volute and is coaxially connected with the motor rotor through a second impeller shaft, an air inlet hole is formed in the motor shell, an air vent is formed in the second flange, the second volute is provided with a heat exhaust channel, and the air inlet hole, the inner cavity of the motor shell, the air vent, the impeller cavity of the second volute and the heat exhaust channel are sequentially communicated;
the first bearing assembly includes a first air-levitated radial bearing, a first air-levitated thrust bearing and a second air-levitated thrust bearing, the first air suspension radial bearing is fixedly arranged on one side of the first flange close to the motor, the first air suspension thrust bearing and the second air suspension thrust bearing are oppositely arranged at intervals in a front-back direction, the first air suspension thrust bearing is fixedly arranged on the diffuser, the second air suspension thrust bearing is fixedly arranged on one side of the first flange far away from the motor, the first bearing rotating shaft is rotatably arranged on the first air suspension radial bearing, the first air suspension thrust bearing and the second air suspension thrust bearing and is coaxially connected with the motor rotor, a thrust disc coaxially connected with the rotating shaft of the first bearing is arranged between the first air suspension thrust bearing and the second air suspension thrust bearing; the second bearing assembly comprises a second air bearing mounted on a side of the second flange adjacent the electric machine; the second bearing rotating shaft is rotatably arranged on the second air suspension radial bearing and is coaxially connected with the motor rotor.
As a preferred embodiment of the present invention, the front end of the motor rotor is provided with a first hole pillar protruding in the axial direction, an inner hole of the first hole pillar is provided with a first internal thread, the first impeller shaft is provided with a first external thread connected to the first internal thread, a first radially protruding limiting convex shoulder is provided at the root of the first external thread, the first bearing rotating shaft is provided with a first matching hole in transition fit with the periphery of the first hole pillar, and the first limiting convex shoulder is clamped in a cavity formed by the first matching hole and the first hole pillar in cooperation; the first bearing rotating shaft is far away from one end of the first matching hole, a first sleeve pipe which can be penetrated by the first impeller shaft extends, and a first connecting hole which is in transition fit with the periphery of the first sleeve pipe is formed in the axis position of the thrust disc.
As a preferred embodiment of the present invention, the first impeller is provided with a first trepan boring and a first shaft hole which are coaxially communicated with each other in an axial direction, the first trepan boring is matched with an outer peripheral shape of the first sleeve, a terminal of the first impeller shaft passes through the first shaft hole and is in threaded connection with a first lock nut, and when the first lock nut is tightened, the first impeller, the thrust plate and the first bearing rotating shaft are axially locked at a front end of the motor rotor by the first lock nut; and the tail end of the first impeller shaft is sleeved with a guide cone.
As a preferred embodiment of the present invention, the rear end of the motor rotor is provided with a second hole column protruding in the axial direction, an inner hole of the second hole column is provided with a second internal thread, the second impeller shaft is provided with a second external thread connected to the second internal thread, a second limiting convex shoulder protruding in the radial direction is provided at the root of the second external thread, the second bearing rotating shaft is provided with a second matching hole in transition fit with the periphery of the second hole column, and the second limiting convex shoulder is clamped in a cavity formed by the second matching hole and the second hole column in cooperation; a second sleeve pipe which can be penetrated by the second impeller shaft extends from one end of the second bearing rotating shaft, which is far away from the second matching hole, a balance disc is arranged between the second impeller and the second flange, and a second connecting hole which is in transition fit with the periphery of the second sleeve pipe is arranged at the axis position of the balance disc.
As the utility model discloses preferred scheme, second impeller is equipped with the second trepanning and the second shaft hole of coaxial intercommunication in the axis direction, the second trepanning with the cooperation of second sheathed tube periphery shape, the end of second impeller axle is passed second shaft hole and threaded connection have second lock nut, when second lock nut screws up, the second impeller the balance disc with second bearing pivot quilt second lock nut axial locking is in electric motor rotor's rear end.
As the utility model discloses preferred scheme, be equipped with a heat dissipation section of thick bamboo in the motor, the heat dissipation cylinder jacket is located motor stator's outside, the motor casing jacket is located the outside of a heat dissipation section of thick bamboo, the periphery of a heat dissipation section of thick bamboo all is equipped with a plurality of fin, the length direction of fin with the axis of motor is parallel, adjacent two form gas flow channel between the fin, gas flow channel respectively with the inlet port with the air vent intercommunication.
As the preferred scheme of the utility model, the diffuser adopts the airfoil type blade diffuser that the consistency range is 0.5 ~ 1.2.
As a preferred embodiment of the present invention, the first air-bearing radial bearing and the second air-bearing radial bearing are each composed of a bearing housing, a radial bearing corrugated foil, and a radial bearing flat foil, and the radial bearing corrugated foil and the radial bearing flat foil are sequentially fixed in the bearing housing; the first air suspension thrust bearing and the second air suspension thrust bearing are respectively composed of a bearing bottom plate, an axial bearing corrugated foil and an axial bearing flat foil, and the axial bearing corrugated foil and the axial bearing flat foil are sequentially fixed on the bearing bottom plate.
As a preferred embodiment of the present invention, the first impeller is a three-dimensional flow impeller, which includes a chassis, and main blades and splitter blades formed on the chassis, the chassis is of a disc structure, a circular frustum is disposed in the middle of the chassis, the outer peripheral surface of the circular frustum is in smooth transition with the peripheral surface of the chassis, the main blades and the splitter blades are disposed in the circumferential direction of the chassis, one splitter blade is disposed between every two adjacent main blades, the main blades extend from the upper end of the outer peripheral surface of the circular frustum to the edge of the peripheral surface of the chassis, the size of the splitter blade is smaller than that of the main blade, and the end of the splitter blade extends to the edge of the peripheral surface of the chassis; the inlet oblique cutting angle of the main blade at the inlet of the first impeller is 65-80 degrees, the inlet oblique cutting angle of the splitter blade at the inlet of the first impeller is 60-90 degrees, and the outlet angles of the main blade and the splitter blade at the outlet of the first impeller are both 40-65 degrees.
Implement the utility model provides a pair of air suspension centrifugal blower compares with prior art, and its beneficial effect lies in:
the centrifugal blower of the utility model has the advantages that the centrifugal blower part and the exhaust heat dissipation part are respectively designed at the front end and the rear end of the motor, the corresponding rotating parts (such as the motor rotor, the first impeller, the second impeller, the first impeller shaft, the second impeller shaft, the first bearing rotating shaft and the second bearing rotating shaft) are supported by the air suspension bearing to rotate, when the motor is started, the centrifugal blower part can realize high-power air supply, and has the advantages of large air supply amount, stable operation, high efficiency, low noise, no need of lubrication, no secondary pollution of air by oil and the like; meanwhile, the air exhaust and heat dissipation part sucks cold air from the air inlet hole on the motor shell under the traction action of the second impeller, the sucked cold air flows axially in the motor and drives heat generated by the motor during working to be exhausted to the outside through the air hole on the second flange, the impeller cavity of the second volute and the heat exhaust channel in sequence, so that the motor is fully cooled, and the normal operation at high temperature is met; in addition, in the process of heat extraction, the air flow can carry dust in the machine to be discharged, and the dust is effectively prevented from entering the bearing to cause abrasion.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
Fig. 1 is a schematic structural diagram of an air suspension centrifugal blower provided by the present invention;
FIG. 2 is an enlarged view of a portion of area A in the structure of FIG. 1;
FIG. 3 is an enlarged view of a portion of region B in the structure of FIG. 1;
FIG. 4 is a schematic structural view of a first impeller;
FIG. 5 is a schematic view of the first impeller in cooperation with the diffuser;
FIG. 6 is a cross-sectional view taken in the direction of airflow when the first impeller is mated with the diffuser;
FIG. 7 is a schematic structural view of the exit angle of the primary blades and the exit angle of the splitter blades;
FIG. 8 is a flow-to-pressure ratio expected performance curve obtained using a conventional impeller design and the optimized design of the three-dimensional flow impeller of the present invention;
fig. 9 is a flow-efficiency expected performance curve obtained by using a conventional impeller design structure and the optimized design structure of the three-dimensional flow impeller of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of description, and do not indicate or imply that the machine or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
As shown in fig. 1 to 7, the present invention provides a preferred embodiment of an air suspension centrifugal blower, which includes a motor 1, a first volute 2, a first impeller 3, a first impeller shaft 4, a first bearing rotating shaft 5, a second bearing rotating shaft 6, a first bearing assembly and a second bearing assembly, wherein the motor 1 includes a motor housing 101, a motor rotor 102 and a motor stator 103, and the front and rear ends of the motor housing 101 are respectively provided with a first flange 8 and a second flange 9.
The first volute 2 is mounted on the first flange 8 through a diffuser 7, the first impeller 3 is arranged in an impeller cavity of the first volute 2 and is coaxially connected with the motor rotor 102 through the first impeller shaft 4, a sealing ring 10 is arranged between the first impeller 3 and the diffuser 7, an air inlet channel 201 and an air exhaust channel 202 are arranged on the first volute 2, and the air inlet channel 201, the impeller cavity of the first volute 2 and the air exhaust channel 202 are sequentially communicated; the diffuser 7 is used as a main component for recovering dynamic pressure at an outlet of the impeller, the airfoil-shaped blade diffuser 7 with the consistency range of 0.5-1.2 is adopted, the flow loss in the process is reduced as much as possible while the airflow pressure is recovered, and the contraction design with the angle gamma of 3-12 degrees is carried out in the width direction of the diffuser 7, so that the flow loss in the process is reduced as much as possible while the airflow pressure is recovered, and the stability of the flow is kept; the sectional area of the volute is suitable for changing along the circumferential direction according to the flow change, so that the impact of airflow on the wall surface of the volute and the airflow loss can be reduced as much as possible. It should be noted that the provision of the seal ring 10 can prevent the leakage of the compressed air into the motor 1 from the gap between the first impeller 3 and the diffuser 7, thereby improving the operating efficiency of the centrifugal blower.
The air suspension centrifugal blower further comprises a second volute 19, a second impeller 20 and a second impeller shaft 21, the second volute 19 is installed on the second flange 9, the second impeller 20 is arranged in an impeller cavity of the second volute 19 and is coaxially connected with the motor rotor 102 through the second impeller shaft 21, an air inlet hole 106 is formed in the motor casing 101, an air vent is formed in the second flange 9, the second volute 19 is provided with a heat exhaust channel 191, and the air inlet hole 106, an inner cavity of the motor casing 101, the air vent, an impeller cavity of the second volute 19 and the heat exhaust channel 191 are sequentially communicated. During normal operation, under the traction action of the second impeller 20, cold air is sucked from the air inlet hole 106 on the motor casing 101, the sucked cold air flows axially inside the motor 1 and drives heat generated during the operation of the motor 1 to be discharged outside through the air hole on the second flange 9, the impeller cavity of the second volute 19 and the heat discharge channel 191 in sequence, so that the motor 1 is fully cooled, and the normal operation at high temperature is met. In addition, in the process of heat extraction, the air flow can carry dust in the machine to be discharged, and the dust is effectively prevented from entering the bearing to cause abrasion.
First bearing subassembly includes first air suspension radial bearing 11, first air suspension thrust bearing 12 and second air suspension thrust bearing 13, first air suspension radial bearing 11 fixed mounting be in first flange 8 is close to one side of motor 1, first air suspension thrust bearing 12 with second air suspension thrust bearing 13 is the interval mutual disposition around being, first air suspension thrust bearing 12 fixed mounting be in on the diffuser 7, second air suspension thrust bearing 13 fixed mounting be in first flange 8 is kept away from one side of motor 1, first bearing pivot 5 rotationally sets up on first air suspension radial bearing 11, first air suspension thrust bearing 12 and the second air suspension thrust bearing 13 and with motor rotor 102 coaxial coupling, first air suspension thrust bearing 12 with be equipped with between the second air suspension thrust bearing 13 with first bearing pivot 13 A thrust disc 14 coaxially connected to the shaft 5; the second bearing assembly comprises a second air bearing 15, and the second air bearing 15 is arranged on one side of the second flange 9 close to the motor 1; the second bearing shaft 6 is rotatably disposed on the second air bearing 15 and coaxially connected to the motor rotor 102. The first air suspension radial bearing 11 and the second air suspension radial bearing 15 are respectively composed of a bearing shell, a radial bearing corrugated foil and a radial bearing flat foil, and the radial bearing corrugated foil and the radial bearing flat foil are sequentially fixed in the bearing shell; the first air suspension thrust bearing 12 and the second air suspension thrust bearing 13 are respectively composed of a bearing bottom plate, an axial bearing corrugated foil and an axial bearing flat foil, and the axial bearing corrugated foil and the axial bearing flat foil are sequentially fixed on the bearing bottom plate. Therefore, compared with the traditional gas bearing, the foil type dynamic pressure gas thrust bearing has the characteristics of no need of an external gas source, large bearing capacity, long service life, high reliability, strong high temperature resistance, good high-speed stability and the like. Because the foil has good elastic characteristics, the bearing supporting surface can be correspondingly deformed and adjusted according to the change of the rotating speed and the load, a corresponding lubricating air film is automatically formed, stronger shock resistance and self-adaptive performance are embodied, and because coulomb friction force exists between the foil and between the foil and the inner wall of the bearing shell in the operation process of the foil bearing, part of redundant energy is consumed, and the foil plays an important role in inhibiting the vibration of a rotor system, keeping the stability and the like. The self-adaptive characteristic of the foil greatly reduces the tolerance precision requirement of the foil type dynamic pressure gas bearing relative to the static pressure gas bearing and the rigor degree of the rotor alignment requirement.
Illustratively, the air gap between the motor rotor 102 and the motor stator 103 is 2 mm-9 mm, so that the temperature rise of the motor 1 is less than or equal to 100K while the efficiency of the motor 1 is ensured.
Illustratively, the motor 1 is preferably a high-speed permanent magnet synchronous motor, and the motor 1 is electrically connected with a frequency converter for regulating the rotating speed of the motor 1. The rotating speed of the high-speed permanent magnet synchronous motor can reach 100000r/min at most, and the efficiency of the motor can be guaranteed to be more than or equal to 96% within the adjusting range of 45% -100% through a frequency converter.
Exemplarily, a first hole column 104 protruding axially is arranged at the front end of the motor rotor 102, an inner hole of the first hole column 104 is provided with a first inner thread, the first impeller shaft 4 is provided with a first outer thread connected with the first inner thread, a first limiting shoulder 105 protruding radially is arranged at the root of the first outer thread, the first bearing rotating shaft 5 is provided with a first matching hole 501 in transition fit with the outer periphery of the first hole column 104, and the first limiting shoulder 105 is clamped in a cavity formed by matching the first matching hole 501 with the first hole column 104; the first bearing rotating shaft 5 is provided with a first sleeve 502 which is far away from one end of the first matching hole 501 and can be penetrated by the first impeller shaft 4, and a first connecting hole which is in transition fit with the periphery of the first sleeve 502 is arranged at the axis position of the thrust disc 14. The first impeller 3 is provided with a first sleeve hole 301 and a first shaft hole 302 which are coaxially communicated in the axis direction, the first sleeve hole 301 is matched with the outer periphery of the first sleeve pipe 502 in shape, the tail end of the first impeller shaft 4 penetrates through the first shaft hole 302 and is in threaded connection with a first locking nut 16, and when the first locking nut 16 is screwed, the first impeller 3, the thrust disc 14 and the first bearing rotating shaft 5 are axially locked at the front end of the motor rotor 102 through the first locking nut 16. Due to the design, the first impeller 3, the first impeller shaft 4, the first bearing rotating shaft 5, the thrust disc 14, the motor rotor 102 and other rotating parts can be conveniently connected and assembled, and the coaxiality and stability of the rotating parts can be ensured.
Illustratively, the end of the first impeller shaft 4 is sleeved with a guide cone 17 to reduce the flow resistance of the intake air at the axial position of the impeller.
Illustratively, the air inlet channel 201 is connected with a trumpet-shaped air inlet suction nozzle 18, and the air inlet suction nozzle 18, the air inlet channel 201 and the first impeller shaft 4 are coaxial, so that the air inlet flow resistance at the air inlet of the first volute 2 is reduced.
Illustratively, the second volute 19 is provided with a detachable end cover 22 in the axial direction of the second impeller shaft 21 to facilitate maintenance and repair of the second impeller 20.
Exemplarily, the rear end of the motor rotor 102 is provided with a second hole column 107 protruding axially, an inner hole of the second hole column 107 is provided with a second internal thread, the second impeller shaft 21 is provided with a second external thread connected with the second internal thread, a root of the second external thread is provided with a second limiting shoulder 108 protruding radially, the second bearing rotating shaft 6 is provided with a second matching hole 601 in transition fit with the outer periphery of the second hole column 107, and the second limiting shoulder 108 is clamped in a cavity formed by matching the second matching hole 601 with the second hole column 107; a second sleeve 602, through which the second impeller shaft 21 can penetrate, extends from one end of the second bearing rotating shaft 6, which is far away from the second matching hole 601, a balance disc 23 is arranged between the second impeller 20 and the second flange 9, and a second connecting hole in transition fit with the outer periphery of the second sleeve 602 is arranged at the axis position of the balance disc 23; the second impeller 20 is provided with a second sleeve hole 201 and a second shaft hole 202 which are coaxially communicated in the axial direction, the second sleeve hole 201 is matched with the outer periphery of the second sleeve 602 in shape, the tail end of the second impeller shaft 21 penetrates through the second shaft hole 202 and is connected with a second locking nut 24 in a threaded mode, and when the second locking nut 24 is screwed, the second impeller 20, the balance disc 23 and the second bearing rotating shaft 6 are axially locked at the rear end of the motor rotor 102 through the second locking nut 24. Due to the design, the connection and assembly of the second impeller 20, the second impeller shaft 21, the second bearing rotating shaft 6, the balance disc 23 and the rotating components such as the motor rotor 102 can be facilitated, and the coaxiality and stability of the rotating components can be ensured.
Exemplarily, a heat dissipation cylinder 109 is arranged in the motor 1, the heat dissipation cylinder 109 is sleeved outside the motor stator 103, the motor casing 101 is sleeved outside the heat dissipation cylinder 109, a plurality of heat dissipation fins are arranged on the periphery of the heat dissipation cylinder 109, the length directions of the heat dissipation fins are parallel to the axis of the motor 1, a gas flow channel is formed between two adjacent heat dissipation fins, and the gas flow channel is respectively communicated with the air inlet 106 and the air vent. Accordingly, the heat radiation effect of the motor 1 can be improved by providing the heat radiation cylinder 109.
Illustratively, the heat-dissipating cylinder 109 is die-cast or cast from an aluminum alloy. The heat dissipation cylinder 109 is a circular cylinder, and a plurality of the heat dissipation fins are uniformly arranged on the peripheral wall of the heat dissipation cylinder 109 in a circumferential direction of 360 degrees. Under the traction action of the second impeller 20, outside air enters the inside of the motor 1 from the air inlet, and carries the heat generated by the operation of the motor 1 to be discharged outside through the heat dissipation channel, the vent hole on the second flange 9, the impeller cavity of the second volute 19 and the heat discharge opening in sequence.
Illustratively, the first impeller 3 is a three-dimensional flow impeller, which includes a base plate 303, and main blades 304 and splitter blades 305 formed on the base plate 303, the base plate 303 is a disc structure, a circular frustum 306 is disposed in the middle of the base plate 303, an outer circumferential surface of the circular frustum 306 is in smooth transition with a peripheral surface of the base plate 303, the main blades 304 and the splitter blades 305 are both disposed in a plurality in a circumferential direction of the base plate 303, one splitter blade 305 is disposed between every two adjacent main blades 304, the main blades 304 extend from an upper end of the outer circumferential surface of the circular frustum 306 to edges of the peripheral surface of the base plate 303, the size of the splitter blade 305 is smaller than that of the main blade 304, and a distal end of the splitter blade 305 extends to the edges of the peripheral surface of the base plate 303; the inlet oblique-cutting angle α of the main blade 304 at the inlet of the first impeller 3 is 65 to 80 degrees, the inlet oblique-cutting angle of the splitter blade 305 at the inlet of the first impeller 3 is 60 to 90 degrees, and the outlet angles β of the main blade 304 and the splitter blade 305 at the outlet of the first impeller 3 are both 40 to 65 degrees. In this embodiment, each of the main blades 304 and the splitter blades 305 has 6, 7, 8, or 9 blades.
Taking a centrifugal blower with a design flow rate of 2.3kg/s and a pressure ratio of 1.85 as an example, the expected performance curves obtained by using the conventional design structure and the optimized design structure of the three-dimensional flow impeller are compared, as shown in fig. 8 and 9. It can be seen that, the first impeller 3 is designed and optimized by adopting a ternary flow theory based on optimal load distribution, and compared with the common structures of the front edge (i.e. inlet side) of the impeller blade, such as a vertical axis, a zero inclination angle and the like in the existing market, by setting the oblique angle of the impeller inlet, the actual flow area of the impeller inlet can be increased and the blocking effect at the impeller inlet can be reduced under the condition of the same mach number of the impeller inlet tip, so that the pneumatic efficiency of the impeller can be improved by 1% -2% and the flow range can be widened by 3% -6%, the requirements of parameters of different units, such as design flow, pressure rise, rotating speed and the like, and the three-way flow impeller has the advantages of small flow loss, high pneumatic efficiency, wide range of stable operation working conditions, easiness in machining and the like.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (9)
1. An air suspension centrifugal blower is characterized by comprising a motor, a first volute, a second volute, a first impeller, a second impeller, a first impeller shaft, a second impeller shaft, a first bearing rotating shaft, a second bearing rotating shaft, a first bearing assembly and a second bearing assembly, wherein the motor comprises a motor shell, a motor rotor and a motor stator, and a first flange and a second flange are respectively arranged at the front end and the rear end of the motor shell;
the first volute is mounted on the first flange through a diffuser, the first impeller is arranged in an impeller cavity of the first volute and is coaxially connected with the motor rotor through the first impeller shaft, a sealing ring is arranged between the first impeller and the diffuser, an air inlet channel and an air exhaust channel are arranged on the first volute, and the air inlet channel, the impeller cavity of the first volute and the air exhaust channel are sequentially communicated;
the second volute is mounted on the second flange, the second impeller is arranged in an impeller cavity of the second volute and is coaxially connected with the motor rotor through a second impeller shaft, an air inlet hole is formed in the motor shell, an air vent is formed in the second flange, the second volute is provided with a heat exhaust channel, and the air inlet hole, the inner cavity of the motor shell, the air vent, the impeller cavity of the second volute and the heat exhaust channel are sequentially communicated;
the first bearing assembly includes a first air-levitated radial bearing, a first air-levitated thrust bearing and a second air-levitated thrust bearing, the first air suspension radial bearing is fixedly arranged on one side of the first flange close to the motor, the first air suspension thrust bearing and the second air suspension thrust bearing are oppositely arranged at intervals in a front-back direction, the first air suspension thrust bearing is fixedly arranged on the diffuser, the second air suspension thrust bearing is fixedly arranged on one side of the first flange far away from the motor, the first bearing rotating shaft is rotatably arranged on the first air suspension radial bearing, the first air suspension thrust bearing and the second air suspension thrust bearing and is coaxially connected with the motor rotor, a thrust disc coaxially connected with the rotating shaft of the first bearing is arranged between the first air suspension thrust bearing and the second air suspension thrust bearing; the second bearing assembly comprises a second air bearing mounted on a side of the second flange adjacent the electric machine; the second bearing rotating shaft is rotatably arranged on the second air suspension radial bearing and is coaxially connected with the motor rotor.
2. The air suspension centrifugal blower according to claim 1, wherein the front end of the motor rotor is provided with a first hole column protruding axially, an inner hole of the first hole column is provided with a first internal thread, the first impeller shaft is provided with a first external thread connected with the first internal thread, the root of the first external thread is provided with a first limiting convex shoulder protruding radially, the first bearing rotating shaft is provided with a first matching hole in transition fit with the outer periphery of the first hole column, and the first limiting convex shoulder is clamped in a cavity formed by the first matching hole and the first hole column in a matching mode; the first bearing rotating shaft is far away from one end of the first matching hole, a first sleeve pipe which can be penetrated by the first impeller shaft extends, and a first connecting hole which is in transition fit with the periphery of the first sleeve pipe is formed in the axis position of the thrust disc.
3. The air suspension centrifugal blower according to claim 2, wherein the first impeller is provided with a first sleeve hole and a first shaft hole which are coaxially communicated with each other in the axial direction, the first sleeve hole is matched with the outer periphery of the first sleeve in shape, the tail end of the first impeller shaft penetrates through the first shaft hole and is in threaded connection with a first locking nut, and when the first locking nut is tightened, the first impeller, the thrust disc and the first bearing rotating shaft are axially locked at the front end of the motor rotor by the first locking nut; and the tail end of the first impeller shaft is sleeved with a guide cone.
4. The air suspension centrifugal blower according to claim 1, wherein a second hole column protruding axially is arranged at the rear end of the motor rotor, a second internal thread is arranged in an inner hole of the second hole column, a second external thread connected with the second internal thread is arranged on the second impeller shaft, a second limiting convex shoulder protruding radially is arranged at the root of the second external thread, a second matching hole in transition fit with the outer periphery of the second hole column is arranged on the second bearing rotating shaft, and the second limiting convex shoulder is clamped in a cavity formed by the second matching hole and the second hole column in matching; a second sleeve pipe which can be penetrated by the second impeller shaft extends from one end of the second bearing rotating shaft, which is far away from the second matching hole, a balance disc is arranged between the second impeller and the second flange, and a second connecting hole which is in transition fit with the periphery of the second sleeve pipe is arranged at the axis position of the balance disc.
5. The air suspension centrifugal blower according to claim 4, wherein the second impeller is provided with a second sleeve hole and a second shaft hole which are coaxially communicated in the axial direction, the second sleeve hole is matched with the outer periphery of the second sleeve in shape, the tail end of the second impeller shaft penetrates through the second shaft hole and is in threaded connection with a second lock nut, and when the second lock nut is tightened, the second impeller, the balance disc and the second bearing rotating shaft are axially locked at the rear end of the motor rotor by the second lock nut.
6. The air suspension centrifugal blower according to claim 1, wherein a heat dissipation cylinder is disposed in the motor, the heat dissipation cylinder is sleeved outside the motor stator, the motor casing is sleeved outside the heat dissipation cylinder, a plurality of heat dissipation fins are disposed on the periphery of the heat dissipation cylinder, the length direction of each heat dissipation fin is parallel to the axis of the motor, a gas flow channel is formed between every two adjacent heat dissipation fins, and the gas flow channels are respectively communicated with the air inlet and the air vent.
7. The air-suspending centrifugal blower according to claim 1, wherein the diffuser is an airfoil-shaped blade diffuser with a consistency range of 0.5-1.2.
8. The air-suspending centrifugal blower of claim 1, wherein the first air-suspending radial bearing and the second air-suspending radial bearing are each composed of a bearing housing, a radial bearing bump foil and a radial bearing flat foil, and the radial bearing bump foil and the radial bearing flat foil are fixed in the bearing housing in sequence; the first air suspension thrust bearing and the second air suspension thrust bearing are respectively composed of a bearing bottom plate, an axial bearing corrugated foil and an axial bearing flat foil, and the axial bearing corrugated foil and the axial bearing flat foil are sequentially fixed on the bearing bottom plate.
9. An air-suspending centrifugal blower according to any one of claims 1 to 8, wherein the first impeller is a three-dimensional flow impeller, which comprises a chassis, and a main blade and a splitter blade which are formed on the chassis, wherein the chassis is of a disc structure, a circular frustum is arranged in the middle of the chassis, the peripheral surface of the circular frustum is in smooth transition with the peripheral surface of the chassis, a plurality of main blades and a plurality of splitter blades are arranged in the circumferential direction of the chassis, one splitter blade is arranged between every two adjacent main blades, the main blades extend from the upper end of the peripheral surface of the circular frustum to the edge of the peripheral surface of the chassis, the size of the splitter blade is smaller than that of the main blade, and the tail end of the splitter blade extends to the edge of the peripheral surface of the chassis; the inlet oblique cutting angle of the main blade at the inlet of the first impeller is 65-80 degrees, the inlet oblique cutting angle of the splitter blade at the inlet of the first impeller is 60-90 degrees, and the outlet angles of the main blade and the splitter blade at the outlet of the first impeller are both 40-65 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022068926.8U CN213981244U (en) | 2020-09-18 | 2020-09-18 | Air suspension centrifugal blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022068926.8U CN213981244U (en) | 2020-09-18 | 2020-09-18 | Air suspension centrifugal blower |
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| Publication Number | Publication Date |
|---|---|
| CN213981244U true CN213981244U (en) | 2021-08-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022068926.8U Expired - Fee Related CN213981244U (en) | 2020-09-18 | 2020-09-18 | Air suspension centrifugal blower |
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| Country | Link |
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| CN (1) | CN213981244U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114909324A (en) * | 2022-05-31 | 2022-08-16 | 深圳市敖森环科技有限公司 | Impeller with high rotating speed and large air volume and air pressure |
| CN116742879A (en) * | 2023-05-16 | 2023-09-12 | 广东聚磁动力科技有限公司 | Air-cooled heat dissipation structure and magnetic levitation motor |
| CN119844392A (en) * | 2025-03-11 | 2025-04-18 | 璞瑞斯科技(湖北)股份有限公司 | Air suspension oilless centrifugal direct-drive air compressor |
-
2020
- 2020-09-18 CN CN202022068926.8U patent/CN213981244U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114909324A (en) * | 2022-05-31 | 2022-08-16 | 深圳市敖森环科技有限公司 | Impeller with high rotating speed and large air volume and air pressure |
| CN116742879A (en) * | 2023-05-16 | 2023-09-12 | 广东聚磁动力科技有限公司 | Air-cooled heat dissipation structure and magnetic levitation motor |
| CN119844392A (en) * | 2025-03-11 | 2025-04-18 | 璞瑞斯科技(湖北)股份有限公司 | Air suspension oilless centrifugal direct-drive air compressor |
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Granted publication date: 20210817 |