CN210686378U

CN210686378U - Centrifugal fan of dust collector

Info

Publication number: CN210686378U
Application number: CN201921492469.6U
Authority: CN
Inventors: 陆文采; 李御; 林亮亮; 李文斌
Original assignee: Zhejiang Aozheng Electromechanical Technology Co Ltd
Current assignee: Zhejiang Aozheng Electromechanical Technology Co Ltd
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2020-06-05
Anticipated expiration: 2029-09-09

Abstract

A centrifugal fan of a dust collector belongs to the technical field of elastic fluid rotors and comprises an impeller outer cover, an impeller, a diffuser with blades and a motor; the impeller outer cover is provided with an air inlet and an air outlet; the air inlet is positioned in the center of the top of the impeller outer cover, and the impeller is accommodated in the impeller outer cover and is arranged adjacent to the air inlet; a first mounting hole is axially formed in the middle of the impeller; the vaned diffuser is contained in the impeller outer cover and is positioned at the downstream of the impeller; the vaned diffuser comprises an outer shell, an axial guide vane and an inner shell which are integrally arranged; the axial guide vanes are obliquely arranged between the outer shell and the inner shell, and oblique guide holes are formed between adjacent axial guide vanes; the motor is connected with the impeller and the diffuser with the blades. This technical scheme, the structure that has the leaf diffuser formula as an organic whole has solved conventional dust catcher and has had the layered occupation space of leaf diffuser big, and product processing is loaded down with trivial details, shortcoming that the cost of manufacture is high to increase the air volume of dust catcher motor, improved motor efficiency.

Description

Centrifugal fan of dust collector

Technical Field

The utility model belongs to the technical field of elastic fluid rotor, in particular to dust catcher centrifugal fan.

Background

The centrifugal fan of the dust collector utilizes a motor rotor to drive a centrifugal impeller to rotate at a high speed, and air negative pressure is generated in a sealed shell, so that impurities such as dust and the like are sucked into a cleaning electric appliance in a dust collecting bag.

In order to increase the portability and comfort of the vacuum cleaner, the volume of the vacuum cleaner tends to be reduced. The centrifugal fan is used as a core component of the vertical dust collector, and in order to realize high efficiency and energy saving of the dust collector, a blade type diffuser is mostly adopted, and the centrifugal fan works under the working condition of high rotating speed so as to obtain higher fan efficiency. Therefore, the volume of the centrifugal fan of the vacuum cleaner needs to be controlled.

The centrifugal fan of the traditional dust collector has high rotating speed which is 33000-. For example, the diffuser in the compressor adopts a split structure, the axial guide vane and the bearing chamber are layered, a large space is occupied, and the reliability is poor; the casing is thick and heavy, wholly wraps up inside device, and is repeated with the outer wall function of inside device, and the thermal diffusivity is poor. Therefore, the traditional centrifugal fan of the dust collector has the defects of poor heat dissipation performance, low reliability and heavy volume of a working motor.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a centrifugal fan for a vacuum cleaner.

The utility model adopts the following technical scheme.

A centrifugal fan of a dust collector comprises an impeller outer cover, an impeller, a diffuser with blades and a motor; the impeller outer cover is provided with an air inlet and an air outlet; the air inlet is positioned in the center of the top of the impeller outer cover, and the impeller is accommodated in the impeller outer cover and is arranged adjacent to the air inlet; a first mounting hole is axially formed in the middle of the impeller; the vaned diffuser is contained in the impeller outer cover and is positioned at the downstream of the impeller; the vaned diffuser comprises an outer shell, an axial guide vane and an inner shell which are integrally arranged; the axial guide vanes are obliquely arranged between the outer shell and the inner shell, and oblique guide holes are formed between adjacent axial guide vanes; the motor is connected with the impeller and the diffuser with the blades.

The outer shell is of a hollow annular structure; the inner shell is in a disc shape and is coaxially arranged with the outer shell, and a first bearing chamber is arranged at the axis of the inner shell; the first bearing chamber is provided with a through hole which axially penetrates through the inner shell; the axial guide vanes are distributed on the outer edge of the inner shell at equal angles by taking the circle center of the inner shell as a midpoint; the axial guide vane is a thin vane, the inner side of the axial guide vane is fixedly connected with the outer edge of the inner shell, and the outer side of the axial guide vane is fixedly connected with the inner wall of the outer shell; a first axial groove is formed in the inner wall of the first bearing chamber; the number of the first axial grooves is 3, and the first axial grooves are uniformly distributed on the inner wall of the first bearing chamber at equal angles; the middle part of the upper surface of the inner shell is provided with a coaxial cake groove which is sunken inwards, so that a layer of ladder is arranged on the end surface of the upper surface of the inner shell, the height of the end surface is divided into two layers, and the gap between the outer layer of the end surface and the impeller chassis is reduced to form an anti-backflow structure; the intersection angle of the axial guide vane and the outer shell is 25-40 degrees.

The front end of the axial guide vane is arranged in an arc shape to form a front edge, and the rear end of the axial guide vane is arranged in an arc shape to form a rear edge; the top end of the front edge is flush with the upper surface of the inner shell, and the intersection angle degree of the front edge and the inner shell is smaller than that of the axial guide vane and the inner shell; the end of the trailing edge is adjacent to the bottom of the outer shell, and the intersection angle degree of the trailing edge and the inner shell is smaller than that of the axial guide vane and the inner shell.

Radial guide vanes are distributed at the bottom of the inner shell at equal angles; the radial guide vanes are arc-shaped sheets and extend from the outer edge of the inner shell to the axial center of the inner shell; the inner end of the radial guide vane is arranged in a clearance with the first bearing chamber, and the outer side surface of the radial guide vane is fixedly connected with the inner side surface of the axial guide vane; the outer end part of the radial guide vane is tangent to the outer contour of the inner shell; a flow stabilizing groove is formed between adjacent radial guide vanes; the flow stabilizing groove is communicated with the flow guide hole.

The radial guide vanes are distributed in a step shape with low inner part and high outer part; the inner height of the radial guide vane is lower than the outer height; the top of the outer end of the radial guide vane is obliquely arranged, the top of the outer end of the radial guide vane is adjacent to the side wall of the axial guide vane, and the inclination degree of the top of the outer end of the radial guide vane is consistent with the radian of the axial guide vane.

A raised positioning pin is arranged at the downstream of the outer shell; the motor comprises a hollow cylindrical motor shell; a positioning pin groove matched with the positioning pin of the outer shell is formed in the upper part of the inner wall of the motor shell; the downstream of the outer shell is inserted into the motor shell, and the positioning pin is embedded in the positioning pin groove.

The motor comprises a rotor mechanism, wherein the rotor mechanism comprises a shaft core, a first bearing, a first balancing block, magnetic steel, a second balancing block and a second bearing which are coaxially arranged; the part of the shaft core exposed out of the magnetic steel is an equal-diameter circular shaft with a smooth outer wall; the magnetic steel is bonded with the shaft core; the impeller, the first bearing, the first balance weight, the second balance weight and the second bearing are in interference fit with the shaft core.

The motor comprises a stator mechanism; the stator mechanism comprises a motor shell, a stator iron core, a winding frame and a bearing frame; the stator core is formed by annularly arranging three split stator core components; the adjacent stator core components are in mortise and tenon interference connection; one end of the stator iron core component is provided with a mortise, and the other end of the stator iron core component is provided with a tenon matched with the mortise; the tenon is embedded in the mortise of the adjacent stator core assembly; the stator iron core assembly comprises an arc-shaped frame, a stator positioning frame and an inner circular frame; the side surface of the arc-shaped frame is arc-shaped with a central angle of 120 degrees; the upper end of the stator positioning frame is fixedly arranged on the inner wall of the arc-shaped frame, and the lower end of the stator positioning frame is fixedly arranged in the middle of the inner circular frame; the side surface of the inner circular frame is arc-shaped, and the inner circular frame and the arc-shaped frame are arranged coaxially; a winding slot is formed between the adjacent stator positioning frames, and the adjacent inner round frames are arranged in a clearance mode.

First threaded holes and first pins are uniformly distributed on the inner wall of the motor shell at equal angles; a stator positioning piece is arranged in the middle of the outer wall of the arc-shaped frame; the stator positioning piece comprises a positioning through hole and a pin hole which are axially arranged; the bearing frame is of an integrated claw type structure and comprises a second bearing chamber and three bent claws which are radially arranged on the outer edge of the second bearing chamber at equal angles; the free end of the bent claw is provided with a second threaded hole and a second column pin; the first pin and the second pin are respectively inserted into two ends of a pin hole of the stator iron core assembly, and bolts are arranged in the second threaded hole, the positioning through hole and the first threaded hole in a penetrating mode.

The stator iron core assembly is formed by laminating and riveting stator iron core assembly punching sheets; the stator core assembly stamped sheet is sheet-shaped and has the same shape as the side surface of the stator core assembly; the stator mechanism further comprises a winding frame; the winding frames are respectively arranged at two sides of the stator iron core component, and the winding frames at two sides of the stator iron core component cover the whole surface of the stator positioning frame and the upper surface of the inner circular frame; the inner wall of the inner round frame is exposed; the winding frame is provided with a convex brim; the convex eaves extend axially along the inner circular frame.

The existing diffuser of the brushless motor dust collector is installed in a layered mode through axial guide vanes and bearing chambers, and the motor of the whole dust collector is large in size and heavy.

This technical scheme, the structure of vaned diffuser formula as an organic whole has solved conventional dust catcher and has the vaned diffuser layering occupation space big, and the product processing is loaded down with trivial details, shortcoming that the cost of manufacture is high to increase the air volume of dust catcher motor, improved motor efficiency, the vaned diffuser that is used for the dust catcher has compact structure, overflows fast, efficient advantage such as high.

Drawings

FIG. 1 is a schematic view of the structure of the apparatus;

FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1;

FIG. 3 is an exploded view of the present device;

FIG. 4 is an assembly view of the impeller housing, impeller, and vaned diffuser;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;

FIG. 6 is a top view of a vaned diffuser;

FIG. 7 is a bottom view of a vaned diffuser;

FIG. 8 is a perspective view of a vaned diffuser;

FIG. 9 is another perspective view of a vaned diffuser;

fig. 10 is a perspective view of the motor housing;

FIG. 11 is an assembly view of the motor housing and vaned diffuser;

fig. 12 is a schematic structural view of the rotor mechanism;

FIG. 13 is a cross-sectional view taken along plane C-C of FIG. 12;

fig. 14 is a plan view of the stator core;

fig. 15 is a perspective view of the stator core;

fig. 16 is a perspective view of a stator core assembly;

figure 17 is a top view of a stator core assembly lamination;

fig. 18 is a perspective view of the bearing bracket;

fig. 19 is another perspective view of the bearing bracket;

FIG. 20 is an assembly view of the stator mechanism;

fig. 21 is a perspective view of the bobbin;

in the figure: an impeller housing 100, an air inlet 101, an air outlet 102,

An impeller 200, a first mounting hole 201,

The vane-type diffuser 300, an outer shell 301, a positioning pin 302, an axial guide vane 303, a leading edge 304, a trailing edge 305, a diversion hole 306, an inner shell 307, a cake groove 308, a first bearing chamber 309, a first axial groove 310, a radial guide vane 311, a flow stabilizing groove 312, a vane,

Rotor mechanism 400, shaft core 401, annular groove 402, first bearing 403, first weight 404, magnetic steel 405, second weight 406, second bearing 407, and rotor,

The stator structure 500, a motor housing 501, a positioning pin slot 502, a stator core 503, a first threaded hole 504, a first pin 505, a stator core assembly 506, an arc frame 507, a stator positioning frame 508, an inner circular frame 509, a winding slot 510, a positioning through hole 511, a pin hole 512, a stator core assembly punching sheet 513, an arc sheet 514, a stator positioning sheet 515, an inner circular sheet 516, a riveting point 517, a winding frame 518, a bearing frame 519, a second bearing chamber 520, a bent claw 521, a second threaded hole 522, a second pin 523, a convex brim 524, a mortise 525 and a tenon 526.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A centrifugal fan of a dust collector comprises an impeller housing 100, an impeller 200, a bladed diffuser 300 and a motor.

The impeller housing 100 is provided with an air inlet 101 and an air outlet 102; the air inlet 101 is located at the top center of the impeller housing 100, and the air inlet 101 may be circular. A negative pressure may be formed at the air inlet 101, so that the air flow at the air inlet 101 has kinetic energy flowing toward the inside of the impeller housing 100, and thus the air flow may flow in through the air inlet 101 of the impeller housing 100 and flow out from the air outlet 102 of the impeller housing 100.

The impeller 200 is accommodated in the impeller housing 100 and is arranged adjacent to the air inlet 101; a first mounting hole 201 is axially formed in the middle of the impeller 200; the motor is connected to the impeller 200. The motor drives the impeller 200 to rotate at a high speed, so that air in the impeller 200 is centrifugally thrown out, thereby forming a flow of air current.

The vaned diffuser 300 is housed inside the impeller housing 100 downstream of the impeller 200. The vaned diffuser 300 is used to adjust the flow direction and flow speed of the air flow, and when the air flow passes through the vaned diffuser 300, the kinetic energy of the air flow can be converted into the pressure energy of the air flow, and the air flow is guided to be discharged from the air outlet 102 of the impeller housing 100.

The vaned diffuser 300 includes an outer casing 301, axial vanes 303, and an inner casing 307 integrally provided.

The outer shell 301 is a hollow circular ring structure.

The inner shell 307 is in a disc shape and is arranged coaxially with the outer shell 301, and a first bearing chamber 309 is arranged at the axis of the inner shell 307; the first bearing chamber 309 is provided with a through hole axially penetrating the inner housing 307. Preferably, the inner wall of the first bearing chamber 309 is opened with a first axial groove 310. Preferably, there are 3 first axial grooves 310, which are uniformly distributed at equal angles on the inner wall of the first bearing chamber 309. The first axial groove 310 is used for dispensing, so that the diffuser 300 with the blades is fixed on the motor, the bearing is prevented from moving up and down to increase the power consumption of the bearing, and the working efficiency of the motor of the dust collector is improved.

Preferably, the middle of the upper surface of the inner shell 307 is provided with a recessed coaxial disc groove 308. The arrangement of the cake groove 308 makes the upper surface end face of the inner shell 307 have a step, the height of the end face is divided into two layers, the outer layer is close to the impeller 200, the gap between the outer layer and the chassis of the impeller 200 is reduced to form a backflow prevention structure, and the inner layer is the cake groove 308 containing the first bearing chamber 309.

The axial guide vanes 303 are arranged on the outer edge of the inner shell 307 at equal angles by taking the circle center of the inner shell 307 as a midpoint; the axial guide vane 303 is obliquely arranged between the outer shell 301 and the inner shell 307, the inner side of the axial guide vane 303 is fixedly connected with the outer edge of the inner shell 307, and the outer side of the axial guide vane 303 is fixedly connected with the inner wall of the outer shell 301; the axial guide vanes 303 are thin vanes, and inclined guide holes 306 are formed between adjacent axial guide vanes 303. The diversion hole 306 can be used for occasions with smaller ratio of the outer diameter of the motor to the outer diameter of the centrifugal impeller, has wide application range, can effectively reduce backflow of airflow in the bladed diffuser, reduces energy loss and reduces the temperature of the motor.

Preferably, the intersection angle between the axial guide vane 303 and the outer shell 301 is 25-40 degrees.

The front end of the axial guide vane 303 is arranged in an arc shape to form a front edge 304, and the rear end of the axial guide vane 303 is arranged in an arc shape to form a rear edge 305; the top end of the leading edge 304 is flush with the upper surface of the inner shell 307, and the intersection angle degree of the leading edge 304 and the inner shell 307 is smaller than that of the axial guide vane 303 and the inner shell 307; the end of the trailing edge 305 is disposed adjacent to the bottom of the outer shell 301, and the angle of intersection between the trailing edge 305 and the inner shell 307 is smaller than the angle of intersection between the axial guide vane 303 and the inner shell 307.

The leading edge 304 and the trailing edge 305 are arranged, so that the airflow passes through the rounded leading edge 304 and the rounded trailing edge 305 of the axial guide vane 303, the resistance is low, and the airflow is quickly guided without backflow.

Radial guide vanes 311 are distributed at the bottom of the inner shell 307 at equal angles; the radial guide vanes 311 are arc-shaped pieces and extend from the outer edge of the inner shell 307 to the axis of the inner shell 307; the inner end of the radial guide vane 311 is arranged in a clearance with the first bearing chamber 309, and the outer side surface of the radial guide vane 311 is fixedly connected with the inner side surface of the axial guide vane 303. The outer ends of the radial vanes 311 are tangential to the outer contour of the inner housing 307. Flow stabilization grooves 312 are formed between adjacent radial vanes 311. The flow stabilizing groove 312 is communicated with the flow guide hole 306. Preferably, the number of the flow stabilizing grooves 312 is the same as that of the diversion holes 306, and the flow stabilizing grooves 312 correspond to the adjacent diversion holes 306 one by one. The airflow part from the diversion hole 306 flows into the adjacent flow stabilizing groove 312 and flows to the motor, so that the temperature of the motor is reduced, the heat of the stator and the rotor of the motor is quickly taken away, the output power is improved, the temperature of the rotor magnetic steel is reduced, and the demagnetization resistance of the magnetic steel is enhanced.

Further, the inner height of the radial guide vanes 311 is lower than the outer height. The radial guide vanes 311 are distributed in a stepped manner with a low inner portion and a high outer portion, and avoid the influence of the length of the end portion of the motor stator winding.

Further, the top of the outer end of the radial guide vane 311 is arranged in an inclined manner, the top of the outer end of the radial guide vane 311 is arranged adjacent to the side wall of the axial guide vane 303, and the inclination degree of the top of the outer end of the radial guide vane 311 is consistent with the radian of the axial guide vane 303, so that the airflow in the guide hole 306 can partially flow into the flow stabilizing groove 312.

The vaned diffuser 300 is composed of an outer shell 301, an axial guide vane 303, an inner shell 307, a radial guide vane 311 and a first bearing chamber 309 which are of an integrated structure, so that the traditional split structure is changed, the number of parts is reduced, and the manufacturing difficulty is reduced; and the motor volume is reduced, and the carrying is convenient.

This scheme is through with the integrative design of axial stator and bearing chamber, axial stator and the integrative design of radial stator and the reasonable settlement of axial stator and radial stator angle, has formed the vaned diffuser that is applicable to dust catcher centrifugal fan, and it produces following beneficial effect:

1. the motor volume is reduced, and the carrying is convenient;

2. the heat of the stator and the rotor of the motor is quickly taken away, and the output power is improved;

3. the number of parts is reduced, and the manufacturing difficulty is reduced;

4. the temperature of the rotor magnetic steel is reduced, and the demagnetization resistance of the magnetic steel is enhanced.

A raised locating pin 302 is provided downstream of the outer housing 301. The positioning pin 302 is arranged to ensure tight connection, circumferential fit and fixed position when being connected with the shell of the motor. The motor shell is provided with three rectangular positioning pin grooves distributed according to 120 degrees, the inner circle of the motor shell is matched with the outer circle of the vane diffuser in a circumferential mode, the downstream of the outer shell 301 is inserted into the motor shell, the positioning pins 302 are embedded in the positioning pin grooves, and glue is used for adhesion.

The motor includes a rotor mechanism 400 and a stator mechanism 500.

The rotor mechanism 400 includes a shaft core 401, a first bearing 403, a first weight 404, a magnetic steel 405, a second weight 406, and a second bearing 407, all of which are coaxially disposed.

The magnetic steel 405 is sleeved and fixedly mounted on the shaft core 401; the part of the shaft core 401 exposed out of the magnetic steel 405 is an equal-diameter circular shaft with a smooth outer wall. Preferably, the magnetic steel 405 is bonded to the shaft core 401. The magnetic steel 405 is a cylindrical permanent magnet. The magnetic steel 405 is fragile, so that the magnetic steel 405 and the shaft core 401 are not suitable for interference fit, and are suitable for glue binding.

Preferably, the whole shaft core 401 is an equal diameter round shaft with smooth outer wall. As another preferred mode, the connecting position of the shaft core 401 and the magnetic steel 405 is provided with an annular groove 402, and the rest part of the shaft core 401 is an equal-diameter circular shaft with a smooth outer wall. The arrangement of the annular groove 402 facilitates dispensing, and the connection strength between the shaft core 401 and the magnetic steel 405 is enhanced.

Therefore, the upper end part and the lower end part of the shaft core 401 are optical shafts with the same outer diameter, only one external grinding process is needed in processing, the processing difficulty is reduced, the processing time is shortened, the rejection rate of parts is reduced, and the cost is saved. Meanwhile, the magnetic steel of the motor rotor on the market is generally pressed by interference fit, and the magnetic steel is easy to break, so that the requirement on the matching precision of the magnetic steel and the shaft is more strict. The utility model discloses a mucilage binding structure passes through the glue bonding with magnet steel and optical axis, both provides sufficient installation dynamics, and convenient location again, and does not need the cooperation tolerance of close check magnet steel and axle.

A chamfer is arranged on the circumference of the upper end of the shaft core 401. The shaft core 401 is sequentially provided with an impeller 200, a first bearing 403, a first balance block 404, magnetic steel 405, a second balance block 406 and a second bearing 407 from top to bottom. The impeller 200, the first bearing 403, the first weight 404, the second weight 406, and the second bearing 407 are in interference fit with the shaft core 401. During assembly, the second bearing 407, the second weight 406, the magnetic steel 405, the first weight 404, the first bearing 403 and the impeller 200 are sequentially assembled on the shaft core 401 only from bottom to top.

The bearing on the motor rotor on the market generally adopts the pressure equipment mode to press to the shaft shoulder department, if the pressure equipment pressure is too big or the stroke lengthens and can cause the bearing to damage, increases part cost and installation cost. The utility model discloses a shaft core 401 of optical axis, epaxial not having the shaft shoulder, when pressure equipment carried out the pressure equipment, the size of pressure did not have any influence to the bearing, so reduced the probability that the bearing damaged.

The first weight 404 and the second weight 406 are respectively arranged at two sides of the magnetic steel 405. Since the magnetic steel 405 is fragile, it is not easy to correct the balance. Therefore, the first weight 404 and the second weight 406 are respectively arranged on both sides of the magnetic steel 405 to obtain dynamic balance.

The stator mechanism 500 includes a motor housing 501, a stator core 503, a bobbin 518, and a bearing bracket 519.

The motor housing 501 is hollow and cylindrical, and a positioning pin groove 502 adapted to the positioning pin 302 of the outer housing 301 is formed in an upper portion of an inner wall thereof. The downstream of the outer shell 301 is inserted into the motor shell, and the positioning pin 302 is embedded in the positioning pin groove to assist in glue bonding.

First threaded holes 504 and first pins 505 are uniformly distributed on the inner wall of the motor housing 501 at equal angles. Preferably, there are 3 pairs of the first threaded holes 504 and the first pins 505, and the angle of the adjacent first threaded holes 504 is 60 °.

The stator core 503 is formed by three split stator core assemblies 506 in a surrounding manner; adjacent stator core assemblies 506 are in interference mortise and tenon joint.

One end of the stator iron core assembly 506 is provided with a mortise 525, and the other end of the stator iron core assembly is provided with a tenon 526 matched with the mortise 525; the tenon 526 is embedded in the mortise 525 of the adjacent stator core assembly 506. Preferably, the shape of the tenon 526 and the mortise 525 is trapezoidal. As another preference, the shape of the tenon 526 and the mortise 525 is triangle or circular arc, and a conventional tenon-and-mortise structure may also be adopted.

The traditional stator core connecting structure is generally in loose fit press fitting or welding connection, the three sections of the stator core can slide, and the axial size is constrained by a winding frame and winding wires, so that the difficulty of winding wires is increased; the welded connection also destroys the insulation of the stator core, increasing eddy current losses and costs due to the welding process.

The utility model discloses a stator core subassembly 506 is earlier folded the fourth of the twelve earthly branches into 120 stator core split structure each other by the knot point of multi-disc stator split towards the piece through the symmetry, then forms whole stator core with three stator core split punching press, is the tight fit between each split of stator core that the punching press formed, mutual nonslip.

The stator core assembly 506 comprises an arc-shaped frame 507, a stator positioning frame 508 and an inner circular frame 509; the side surface of the arc-shaped frame 507 is arc-shaped with a central angle of 120 degrees; the upper end of the stator positioning frame 508 is fixedly arranged on the inner wall of the arc-shaped frame 507, and the lower end of the stator positioning frame is fixedly arranged in the middle of the inner circular frame 509; the side of the inner circular frame 509 is arc-shaped, and the inner circular frame 509 and the arc-shaped frame 507 are coaxially arranged. The adjacent stator spacers 508 form a winding slot 510 therebetween, and the adjacent inner circular spacers 509 are spaced apart from each other.

It should be noted that the stator mechanism 500 may adopt a three-slot and three-phase structure, and at this time, the upper end of the stator positioning frame 508 is fixedly installed in the middle of the inner wall of the arc-shaped frame 507; a six-slot three-phase structure may also be employed. And only routine variations in the number of parts or positions of parts are considered equivalent in this disclosure and are intended to fall within the scope of the present application.

This technical scheme carries out the joggle pressure equipment through the split type stator core who rivets formation to split type stator core subassembly 506 stack, and the whole stator core who produces winds after installing the bobbin, and the stator winding of completion passes through location structure and motor casing and links to each other with the bearing bracket, and it produces following beneficial effect:

1. welding procedures are reduced, eddy current loss is reduced, and motor efficiency is improved;

2. the difficulty and the cost of mould development are reduced;

3. the motor shell, the bearing frame and the stator core are all concentric, unbalanced electromagnetic force is reduced, and vibration is reduced;

4. the winding is convenient: the split stator core can be assembled after being wound.

And a stator positioning piece is arranged in the middle of the outer wall of the arc-shaped frame 507. Preferably, the stator positioning member includes a positioning through hole 511 and a pin hole 512 both axially disposed.

The bearing frame 519 is of an integrated claw type structure and comprises a second bearing chamber 520 and three bent claws 521 radially arranged on the outer edge of the second bearing chamber 520 at equal angles; the free end of the curved claw 521 is provided with a second threaded hole 522 and a second cylindrical pin 523.

During the installation, insert the column pin hole 512 both ends of locating stator iron core subassembly 506 respectively with first pin 505 on the motor casing 501 and the second pin 523 on the bearing bracket 519 earlier to tentatively fix a position motor casing 501, stator iron core subassembly 506 and bearing bracket 519, reuse bolt passes through second screw hole 522 on the bearing bracket 519, the location through-hole 511 of stator iron core subassembly 506, the first screw hole 504 of motor casing 501, thereby press from both sides stator iron core subassembly 506 and locate between motor casing 501 and bearing bracket 519. Preferably, the positioning through hole 511 may be a round hole or a semicircular hole with a smooth inner wall, and the inner walls of the first threaded hole 504 and the second threaded hole 522 are both provided with threads. As another preferred example, the positioning through hole 511 may be a round hole or a semicircular hole with a smooth inner wall, and the inner walls of the first threaded hole 504 and the second threaded hole 522 are both smooth. The bolt passes through the second screw hole 522, the positioning through hole 511, and the first screw hole 504 and is fixed by a nut. The stator core and the motor shell adopt a pin positioning structure, so that the installation is convenient, and the influence of the size and the form and position tolerance is small.

Preferably, after the motor housing 501, the stator core assembly 506 and the bearing frame 519 are mechanically fixed, glue can be added to the connection position of the motor housing 501 and the stator core assembly 506 and the connection position of the stator core assembly 506 and the bearing frame 519 for fastening and fixing, so that the structural strength of the motor is further ensured.

According to the traditional pin positioning structure, when a motor rotor is installed, a stator is bounced by magnetic steel suction to damage a pin or the pin cannot be installed due to size and form and position tolerance. According to the technical scheme, the stator core and the motor shell are of a pin positioning structure, so that the motor is convenient to install and is slightly influenced by size and form and position tolerance.

When the motor of the dust collector on the market is installed, the bearing frame is buckled on the motor shell, so that the stator core is not stressed and is in a suspended state, and vibration is easy to generate. The utility model discloses a stator core installs, and the bearing bracket atress is on stator core, and by the pin circumference location, locks the bolt again, guarantees that stator core has the constraining force in all directions in the organism, reduces the vibration.

The motor stator core of the dust collector on the market is installed in a non-concentric mode, unbalanced electromagnetic force is generated when the motor stator core rotates, vibration is caused, loss is increased, and the service life of a bearing is shortened. The utility model discloses a stator core installs, respectively adds three cylindric lock at motor housing and bearing bracket, makes stator core and casing concentric, and stator core is concentric with the bearing bracket for motor housing, bearing bracket and stator core are all concentric, subduct unbalanced electromagnetic force, reduce the vibration.

The stator iron core assembly is formed by laminating and riveting stator iron core assembly punching sheets 513. Stator core subassembly is towards piece 513 and is the slice, and its shape is the same with stator core subassembly 506's side shape, can select the stator core subassembly towards piece 513 stack riveting of different quantity as required to form the stator core subassembly 506 of required thickness. The stator core assembly punching sheet 513 comprises an arc sheet 514, a stator positioning sheet 515 and an inner circular sheet 516; riveting points 517 are arranged in the middle of the left side of the arc-shaped sheet 514, the middle of the right side of the arc-shaped sheet and the middle of the stator positioning sheet 515.

Preferably, the stator mechanism 500 further includes a bobbin 518; the bobbins 518 are respectively disposed at two sides of the stator core assembly 506, and the bobbins 518 at two sides of the stator core assembly 506 cover the entire surface of the stator positioning frame 508 and the upper surface of the inner round frame 509. The inner wall of the inner circular shelf 509 is exposed. The bobbin 518 is provided with a convex brim 524; the eaves 524 extend axially along the inner ledge 509.

After the stator core is formed, the upper surface and the lower surface of the stator core need to be added with winding frames, and the shape of the winding frames is set according to the shape of the stator core and is divided into six parts including a three-segment upper part and a three-segment lower part. When the device is installed, the winding frame with the wiring terminal is buckled on the upper part, and the other winding frame is buckled on the lower part; and after the installation is finished, winding the enameled wire to form a stator winding. The function of the bobbin: 1. the enameled wire is prevented from being in direct contact with the stator core, and the insulation protection effect is achieved; 2. the size of the winding enameled wire is restrained, and the enameled wire is prevented from loosening and entering an inner circle to be contacted with the rotor magnetic steel; 3. the positioning of the three phase lines of the winding is ensured, and the vibration is reduced.

The existing stator core connecting structure is generally in loose fit press fitting or welding connection, the three sections of the stator core can slide, and the axial size is constrained by a winding frame and winding wires, so that the difficulty of winding wires is increased; the welded connection also destroys the insulation of the stator core, increasing eddy current losses and costs due to the welding process.

The stator core of the utility model is firstly formed into a 120-degree stator core split structure by the multi-sheet stator split punching sheets through mutually overlapping the symmetrical fastening points, then three stator core split punching sheets are formed into an integral stator core by a tool, and the stator core formed by punching is tightly matched with each split sheet and cannot slide; the stator core and the motor shell adopt a pin positioning structure, so that the installation is convenient, and the influence of the size and the form and position tolerance is small. The problems of efficiency reduction caused by damage to the insulativity of the stator core due to welding of the stator core and relative movement of the stator core caused by loose fit press mounting are solved; the problems of eccentricity and vibration of the stator core are solved.

It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.

Claims

1. A centrifugal fan of a dust collector comprises an impeller outer cover (100), an impeller (200), a diffuser (300) with blades and a motor; the impeller is characterized in that the impeller outer cover (100) is provided with an air inlet (101) and an air outlet (102); the air inlet (101) is positioned in the center of the top of the impeller housing (100), and the impeller (200) is accommodated in the impeller housing (100) and is arranged adjacent to the air inlet (101); a first mounting hole (201) is axially formed in the middle of the impeller (200); the vaned diffuser (300) is accommodated in the impeller housing (100) and is positioned at the downstream of the impeller (200); the vaned diffuser (300) comprises an outer shell (301), axial guide vanes (303) and an inner shell (307) which are integrally arranged; the axial guide vanes (303) are obliquely arranged between the outer shell (301) and the inner shell (307), and oblique guide holes (306) are formed between adjacent axial guide vanes (303); the motor is connected with the impeller (200) and the vane diffuser (300).

2. A vacuum cleaner centrifugal fan according to claim 1, characterized in that the outer casing (301) is a hollow circular ring-shaped structure; the inner shell (307) is in a disc shape and is coaxially arranged with the outer shell (301), and a first bearing chamber (309) is arranged at the axis of the inner shell (307); the first bearing chamber (309) is provided with a through hole which axially penetrates through the inner shell (307); the axial guide vanes (303) are arranged on the outer edge of the inner shell (307) at equal angles by taking the circle center of the inner shell (307) as a midpoint; the axial guide vane (303) is a thin vane, the inner side of the axial guide vane (303) is fixedly connected with the outer edge of the inner shell (307), and the outer side of the axial guide vane (303) is fixedly connected with the inner wall of the outer shell (301); a first axial groove (310) is formed in the inner wall of the first bearing chamber (309); 3 first axial grooves (310) are uniformly distributed on the inner wall of the first bearing chamber (309) at equal angles; the middle part of the upper surface of the inner shell (307) is provided with a coaxial pancake groove (308) which is sunken inwards, so that a layer of ladder is arranged on the end surface of the upper surface of the inner shell (307), the height of the end surface is divided into two layers, and the gap between the outer layer of the end surface and the chassis of the impeller (200) is reduced to form an anti-backflow structure; the intersection angle of the axial guide vane (303) and the outer shell (301) is 25-40 degrees.

3. A vacuum cleaner centrifugal fan according to claim 1 or 2, wherein the axial guide vanes (303) are arcuately arranged at a front end to form a leading edge (304) and at a rear end to form a trailing edge (305); the top end of the leading edge (304) is flush with the upper surface of the inner shell (307), and the intersection angle degree of the leading edge (304) and the inner shell (307) is smaller than that of the axial guide vane (303) and the inner shell (307); the tail end of the trailing edge (305) is arranged adjacent to the bottom of the outer shell (301), and the intersection angle degree of the trailing edge (305) and the inner shell (307) is smaller than that of the axial guide vane (303) and the inner shell (307).

4. A vacuum cleaner centrifugal fan according to claim 3, characterized in that the bottom of the inner casing (307) is equiangularly provided with radial guide vanes (311); the radial guide vane (311) is an arc-shaped sheet and extends from the outer edge of the inner shell (307) to the axis of the inner shell (307); the inner end of the radial guide vane (311) is arranged in a clearance manner with the first bearing chamber (309), and the outer side surface of the radial guide vane (311) is fixedly connected with the inner side surface of the axial guide vane (303); the outer end of the radial guide vane (311) is tangent to the outer contour of the inner housing (307); flow stabilizing grooves (312) are formed between adjacent radial guide vanes (311); the flow stabilizing groove (312) is communicated with the flow guide hole (306).

5. The vacuum cleaner centrifugal fan according to claim 4, wherein the radial guide vanes (311) are in a stepped distribution with a low inside and a high outside; the inner height of the radial guide vane (311) is lower than the outer height; the top of the outer end of the radial guide vane (311) is obliquely arranged, the top of the outer end of the radial guide vane (311) is adjacent to the side wall of the axial guide vane (303), and the inclination degree of the top of the outer end of the radial guide vane (311) is consistent with the radian of the axial guide vane (303).

6. A vacuum cleaner centrifugal fan according to claim 1, wherein a raised locating pin (302) is provided downstream of the outer housing (301); the motor comprises a hollow cylindrical motor shell (501); a positioning pin groove (502) matched with the positioning pin (302) of the outer shell (301) is formed in the upper part of the inner wall of the motor shell (501); the downstream of the outer shell (301) is inserted into the motor shell (501), and the positioning pin (302) is embedded into the positioning pin groove (502).

7. The centrifugal fan of the dust collector is characterized in that the motor comprises a rotor mechanism (400), the rotor mechanism (400) comprises a shaft core (401), a first bearing (403), a first balance block (404), magnetic steel (405), a second balance block (406) and a second bearing (407), and the shaft core (401), the first bearing (403), the first balance block, the second bearing (407) and the second bearing are coaxially arranged; the part of the shaft core (401) exposed out of the magnetic steel (405) is an equal-diameter circular shaft with a smooth outer wall; the magnetic steel (405) is bonded with the shaft core (401); the impeller (200), the first bearing (403), the first balance weight (404), the second balance weight (406) and the second bearing (407) are in interference fit with the shaft core (401).

8. A vacuum cleaner centrifugal fan according to claim 1, wherein the motor comprises a stator mechanism (500); the stator mechanism (500) comprises a motor shell (501), a stator core (503), a winding frame (518) and a bearing frame (519); the stator iron core (503) is formed by annularly arranging three split stator iron core components (506); the adjacent stator core components (506) are in mortise and tenon interference connection; one end of the stator iron core assembly (506) is provided with a mortise (525), and the other end is provided with a tenon (526) matched with the mortise (525); the tenon (526) is embedded in a mortise (525) of the adjacent stator core assembly (506); the stator core assembly (506) comprises an arc-shaped frame (507), a stator positioning frame (508) and an inner circular frame (509); the side surface of the arc-shaped frame (507) is arc-shaped with a central angle of 120 degrees; the upper end of the stator positioning frame (508) is fixedly arranged on the inner wall of the arc-shaped frame (507), and the lower end of the stator positioning frame is fixedly arranged in the middle of the inner circular frame (509); the side surface of the inner circular frame (509) is arc-shaped, and the inner circular frame (509) and the arc-shaped frame (507) are coaxially arranged; a winding slot (510) is formed between the adjacent stator positioning frames (508), and the adjacent inner circular frames (509) are arranged in a clearance mode.

9. The centrifugal fan for vacuum cleaners according to claim 8, characterized in that the motor housing (501) has a first threaded hole (504) and a first pin (505) uniformly distributed on the inner wall at equal angles; a stator positioning piece is arranged in the middle of the outer wall of the arc-shaped frame (507); the stator positioning piece comprises a positioning through hole (511) and a pin hole (512) which are axially arranged; the bearing frame (519) is of an integrated claw type structure and comprises a second bearing chamber (520) and three bent claws (521) which are radially arranged on the outer edge of the second bearing chamber (520) at equal angles; the free end of the bent claw (521) is provided with a second threaded hole (522) and a second pin (523); the first pin (505) and the second pin (523) are respectively inserted into two ends of a pin hole (512) of the stator core assembly (506), and bolts penetrate through the second threaded hole (522), the positioning through hole (511) and the first threaded hole (504).

10. The centrifugal fan for vacuum cleaner as described in claim 8, wherein said stator core assembly is laminated and riveted by a stator core assembly punching sheet (513); the stator core assembly punching sheet (513) is sheet-shaped, and the shape of the stator core assembly punching sheet is the same as the shape of the side surface of the stator core assembly (506); the stator mechanism (500) further comprises a bobbin (518); the winding frames (518) are respectively arranged at two sides of the stator iron core component (506), and the winding frames (518) at two sides of the stator iron core component (506) cover the whole surface of the stator positioning frame (508) and the upper surface of the inner circular frame (509); the inner wall of the inner round rack (509) is exposed; the winding frame (518) is provided with a convex brim (524); the convex eaves (524) extend axially along the inner circular frame (509).