CN212278062U - Mounting structure of movable impeller and rotating shaft - Google Patents

Abstract

The application discloses mounting structure of movable vane wheel and pivot includes: a rotating shaft; the movable impeller is arranged on one end part of the rotating shaft along the axial direction of the rotating shaft, and a jack for inserting the rotating shaft is formed on the movable impeller; the plug hole is a multi-stage step hole, a plurality of shaft shoulders with different diameters and matched with the step hole are arranged at the end part of the rotating shaft, and an interference fit area section and a clearance fit area section suitable for glue connection are formed between the shaft shoulders and the plug hole. Through the mode, the mounting structure of movable vane wheel and pivot in this application is applicable to the high-speed condition of operation of pivot, has to connect reliable and stable advantage.

Description

Mounting structure of movable impeller and rotating shaft

Technical Field

The application relates to the technical field of dust collectors, in particular to a mounting structure of a movable impeller and a rotating shaft of a brushless motor of a dust collector.

Background

With the development of society and the continuous improvement of living standard of people, a dust collector is used in more and more families as a household cleaning device. The dust collector is an electric appliance which utilizes a motor to generate air negative pressure in a sealed shell to suck dust or garbage, and the main function of the existing dust collector is to recover and clean the dust and the garbage on the ground, a carpet and the like at home. The installation mode of the brushless motor and the impeller of the existing dust collector is simpler, the impeller is basically directly installed in a pressing mode, and the existing dust collector cannot be suitable for the working condition that the rotating shaft runs at a high speed. Therefore, it is necessary to develop a mounting structure for the impeller and the rotating shaft.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the technology, the movable impeller and rotating shaft mounting structure applicable to high-speed rotation of the rotating shaft has the advantages of being stable and reliable in connection.

The technical scheme adopted by the application for solving the technical problem is as follows:

a mounting structure of a movable impeller and a rotating shaft comprises: a rotating shaft; the movable impeller is arranged at one end part of the rotating shaft along the axial direction of the rotating shaft, and a jack for the insertion of the rotating shaft is formed on the movable impeller; the plug hole is a multi-stage stepped hole, a shaft shoulder matched with the stepped hole is arranged at the end of the rotating shaft, and an interference fit area section and a clearance fit area section suitable for glue connection are formed between the shaft shoulder and the plug hole.

Preferably, the jack is a three-stage stepped hole and is provided with a first hole part, a second hole part and a third hole part which are coaxially arranged and have gradually increasing hole diameters, and the first hole part is arranged far away from the motor.

Preferably, the first hole portion and the rotating shaft are in clearance fit, the second hole portion and the rotating shaft are in interference fit, and the third hole portion and the rotating shaft are in clearance fit.

Preferably, one end of the rotating shaft is provided with the shaft shoulder, and the shaft shoulder enables one end of the rotating shaft to be formed with a thin shaft neck in clearance fit with the first hole part.

Preferably, a hole shoulder is formed at the joint of the first hole part and the second hole part, and a space K for storing glue exists between the hole shoulder and the shaft shoulder in the axial direction.

Preferably, the value range of the spacing K is 0.2mm < K <0.5 mm.

Preferably, a cavity is formed in the middle lower portion of the movable impeller, a plurality of rib plates are arranged in the cavity, and the rib plates are distributed on the periphery of the insertion hole at equal intervals along the circumferential direction of the insertion hole.

Preferably, the impeller includes an impeller base and a plurality of vanes formed on an outer wall of the impeller base, wherein the impeller base is substantially tapered, and the tapered surface of the impeller base is a curved surface.

Preferably, the impeller base has a narrow end and a wide end; wherein the edges of the plurality of tabs at the narrow end lie on the same circle C1; the edges of the plurality of tabs at the wide end lie on the same circle C2.

Preferably, the diameter ratio of the circle C1 to the circle C2 is 0.35-0.75.

Compared with the prior art, the application has the beneficial effects that: the application provides a mounting structure of movable vane wheel and pivot, its jack can and the pivot between form interference fit and clearance fit, adopt glue connected mode for clearance fit's regional section between pivot and the jack, above-mentioned mounting structure can be fine be applicable to the high rotational speed's of pivot operating mode, have simple structure, connect reliable and stable advantage.

Drawings

FIG. 1 is a schematic view of the present application showing the positional relationship between a rotating shaft and a moving impeller;

FIG. 2 is a schematic structural view of a moving impeller of the present application;

FIG. 3 is a cross-sectional schematic view of the impeller of the present application;

FIG. 4 is a schematic view of the positional relationship between the rotor assembly and the impeller of the present application;

FIG. 5 is a cross-sectional schematic view of a rotor assembly and impeller of the present application;

FIG. 6 is an enlarged schematic view of region A in FIG. 5;

FIG. 7 is an enlarged schematic view of region B in FIG. 5;

fig. 8 is a schematic structural view of a brushless motor referred to in the present application;

fig. 9 is an exploded schematic view of a brushless motor referred to in this application;

fig. 10 is a schematic cross-sectional view of a brushless motor referred to in this application;

fig. 11 is a structural schematic view of a housing structure of a brushless motor referred to in the present application;

fig. 12 is an exploded schematic view of a housing structure of a brushless motor referred to in the present application;

fig. 13 is a sectional schematic view of a housing structure of a brushless motor referred to in the present application;

fig. 14 is a schematic structural view of a base housing of a brushless motor referred to in the present application;

fig. 15 is a schematic structural view of a bearing bracket of the brushless motor referred to in the present application;

fig. 16 is a schematic sectional view between a rotation shaft and a base housing of a brushless motor related to the present application;

fig. 17 is a schematic structural view of a stator assembly of a brushless motor referred to in this application;

fig. 18 is an exploded schematic view of a stator assembly of a brushless motor referred to in this application;

fig. 19 is a schematic view of a stator core of a brushless motor according to the present application.

Detailed Description

The present application will now be described in further detail with reference to the accompanying drawings, whereby one skilled in the art can, with reference to the description, make an implementation. If in the embodiments of the present application there is a description referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

Aiming at the problem that the installation mode of the brushless motor and the impeller of the dust collector in the prior art is simpler, the impeller is basically directly installed in a pressing mode, and the previous installation structure is not suitable for the high rotating speed along with the continuous improvement of the rotating speed of the motor.

In view of the above, the present application provides a mounting structure for a movable impeller and a rotating shaft, please refer to fig. 1 and 3, including: a rotating shaft 21; the movable impeller 50 is arranged at one end part of the rotating shaft 21 along the axial direction of the rotating shaft, and the movable impeller 50 is formed with a jack 51 for the rotating shaft 21 to be inserted; the insertion hole 51 is a multi-stage stepped hole, a shaft shoulder 211 which is matched with the stepped hole and can enable the rotary shaft 21 to be formed with area sections with different diameters is arranged at one end of the rotary shaft 21, and an interference fit area section and a clearance fit area section suitable for glue connection are formed between the shaft shoulder 211 and the insertion hole 51.

In this way, the jack 51 in this application can and the pivot 21 between form interference fit and clearance fit, adopts the glue connected mode for clearance fit's regional section between pivot 21 and the jack 51, and the high rotational speed's of being applicable to pivot 21 operating mode that can be fine has simple structure, connects reliable and stable advantage.

Further, referring to fig. 3, the insertion hole 51 is a three-step hole having a first hole portion, a second hole portion and a third hole portion which are coaxially arranged and have gradually increasing diameters, and the first hole portion is disposed away from the motor. The first hole portion is in clearance fit with the rotating shaft 21, the second hole portion is in interference fit with the rotating shaft 21, and the third hole portion is in clearance fit with the rotating shaft 21. The three-stage stepped hole can form an interference fit area section and two clearance fit area sections, so that the plug hole 51 and the rotating shaft 21 can be conveniently installed and connected.

Further, referring to fig. 2, a shoulder 211 is disposed on one end of the rotating shaft 21, and the shoulder 211 forms a thin shaft neck on one end of the rotating shaft 21, which is in clearance fit with the first hole. Therefore, the matching relation between the rotating shaft 21 and the insertion hole 51 can be met by arranging the shaft shoulder 211, and the novel plug-in connector has the advantages of being simple in structure and convenient to machine.

Further, referring to fig. 7 in conjunction with fig. 5, a hole shoulder is formed at the joint of the first hole portion and the second hole portion, and a distance K exists between the hole shoulder and the shaft shoulder 211 in the axial direction, and the distance K is used for storing glue. Specifically, the value range of the distance K is 0.2mm < K <0.5mm, the value of K may be 0.25, 0.30, 0.35, 0.40, and 0.45, the value of the distance K should not be too small, if too small, the distance K does not have the function of storing glue, and if too large, the overall structure between the motor and the movable impeller 50 is long.

Further, referring to fig. 1, a cavity is formed at the middle lower portion of the movable impeller 50, a plurality of rib plates 52 are arranged in the cavity, and the rib plates 52 are distributed at equal intervals on the periphery of the insertion hole 51 along the circumferential direction of the insertion hole 51. The rib plates 52 are flush with the jack end faces N of the jacks 51 in the cavities, and the rib plates 52 can effectively enhance the structural strength of the movable impeller 50.

Further, referring to fig. 2 and 3, the impeller 50 is a mixed flow impeller, and the impeller 50 includes an impeller base and a plurality of vanes formed on an outer wall of the impeller base, wherein the impeller base is substantially conical, and a conical surface of the impeller base is a curved surface. Specifically, the movable impeller base is provided with a narrow end part and a wide end part; wherein the edges of the plurality of tabs at the narrow end lie on the same circle C1; the edges of the plurality of tabs at the wide end lie on the same circle C2. The diameter of the circle C1 is A1, the diameter of the circle C2 is A2, the ratio of A1 to A2 is 0.35-0.75, and the ratio of A1 to A2 can be 0.40, 0.45, 0.50, 0.55, 0.60, 0.65 and 0.70, so that the movable impeller 50 has better fluid performance.

It is understood that the installation structure of the movable impeller and the rotating shaft in the present application can be applied to different use scenarios, which are exemplified below.

The mounting structure of the impeller and the rotating shaft in the present application can be applied to a brushless motor, please refer to fig. 8 to 10, the brushless motor includes: the rotor assembly 20 includes a housing structure 10, a rotor assembly 20, and a stator assembly 30, the stator assembly 30 being disposed about a periphery of the rotor assembly 20, the rotor assembly 20 and the stator assembly 30 being disposed within the housing structure 10. The rotor assembly 20 is further provided with an impeller 50, the impeller 50 is exposed outside the casing structure 10, a fan housing 40 is further disposed on the periphery of the impeller 50, and the fan housing 40 is fastened to the casing structure 10.

In the present application, referring to fig. 11 to 13, the housing structure 10 includes: the bearing support structure comprises a base shell 11, an auxiliary sleeve 12 and a bearing support 13, wherein the base shell 11 is a plastic part, the bearing support 13 is a metal part, and the bearing support 13 is fixedly arranged inside the base shell 11. Specifically, the base shell 11 and the bearing support 13 are fixedly connected in an injection molding mode, wherein the bearing support 13 is completely embedded into the base shell 11 in an injection molding mode, the number of parts is reduced, the installation process is effectively simplified, and the installation method has the advantage of convenience in installation. The auxiliary sleeve 12 is fastened to one side end portion of the base housing 11 by glue, and the base housing 11 and the auxiliary sleeve 12 may be integrally formed, and the auxiliary sleeve 12 is used to assist in fixing a driving circuit board (not shown). The base shell 11 is further provided with a plurality of screw holes 113, and the stator assembly 30 is detachably arranged on the base shell 11 through the screw holes 113.

Further, referring to fig. 14 and 15, the base shell 11 is provided with a central hole 111 in the axial direction, and the bearing bracket 13 includes a first circular column 131 located in the central hole 111, a second circular column 133 coaxially disposed with the first circular column 131 and embedded in the base shell 11, and a plurality of fins 132 fixedly disposed between the first circular column 131 and the second circular column 133. The first circular column 131 and the central hole 111 are in interference fit, and have the advantages of stable and reliable connection. The fins 132 are embedded in the base shell 11, one end of each fin 132 is fixed on the outer circumferential wall surface of the first circular column 131, and the other opposite end is fixed on the inner circumferential wall surface of the second circular column 133; the fins 132 are equally spaced along the circumferential direction of the first annular column 131 or the second annular column 133. The wall surface of the fin 132 is further provided with a plurality of arc concave surfaces for increasing the surface area of the fin 132, so as to facilitate heat dissipation.

Further, referring to fig. 14, the base shell 11 is further formed with reinforcing ribs 114 distributed at equal intervals on the periphery of the central hole 111 along the circumferential direction of the central hole 111; wherein, the inside cladding of strengthening rib 114 has fin 132, and strengthening rib 114 is the same with the quantity of fin 132, and the quantity of strengthening rib 114 or fin 132 is preferably 5 ~ 11, and strengthening rib 114 can strengthen the structural strength of base shell 11.

Further, referring to fig. 14, a fixed impeller 112 is formed on the base shell 11, and the fixed impeller 112 is located at the periphery of the central hole 111. Specifically, the fixed impeller 112 includes an annular groove 1121 formed on the base shell 11, and a plurality of fixed blades 1122 distributed in the annular groove 1121; the annular groove 1121 is provided coaxially with the center hole 111, and the fixed blades 1122 are distributed at equal intervals in the circumferential direction of the annular groove 1121.

In this application, the rotor assembly 20 includes a rotating shaft 21, a bearing unit 22, a magnet 24 and a balance ring 23, wherein the bearing unit 22, the magnet 24 and the balance ring 23 are sequentially sleeved on the rotating shaft 21 along an axial direction of the rotating shaft 21. A shaft shoulder for axially positioning the bearing unit 22 and the magnet 24 is formed on the rotating shaft 21, one end of the magnet 24 abuts against the shaft shoulder, the other end opposite to the shaft shoulder abuts against the balance ring 23, and the magnet 24 is connected with the rotating shaft 21 through glue. The bearing unit 22 is disposed in the column hole of the first circular column 131, and the bearing unit 22 and the first circular column 131 are in interference fit. In this application, establish into the metalwork through bearing bracket 13 to do benefit to bearing unit 22 heat dissipation, still be favorable to improving the installation accuracy between bearing unit 22 and the bearing bracket 13, have simple structure, simple to operate, advantage that the radiating effect is good. The balance ring 23 is configured to reduce centrifugal run-out of the shaft 21 due to dynamic imbalance when the shaft 21 is rotated by limiting radial movement of the shaft 21, the balance ring 23 being in an interference connection with the shaft 21. Specifically, a movable impeller 50 is fastened to one end of the rotating shaft 21 in the axial direction thereof, the movable impeller 50 is a load of the brushless motor, and the magnet 24 and the movable impeller 50 are respectively located on opposite sides of the bearing unit 22; the other end of the rotating shaft 21 in the axial direction extends out of the balance ring 23, wherein the axial distance of the other end of the rotating shaft 21 extending out of the balance ring 23 is L3, and L3 is more than or equal to 1.5mm, and the arrangement is as follows: so as to be convenient for dismounting the balancing ring 23, and has the advantage of convenient installation.

In the present application, please refer to fig. 4 and 5, the bearing unit 22 partially extends into the movable vane 50 along the axial direction of the rotating shaft 21, the movable vane 50 is not in contact with the bearing unit 22, the movable vane 50 rotates along with the rotation of the rotating shaft 21, the bearing unit 22 is fastened in the first annular column 131, and if the movable vane 50 is in contact with the bearing unit 22, the normal operation of the movable vane 50 is affected. In the present application, the end portion of the bearing unit 22 close to the movable impeller 50 is extended into the movable impeller 50, thereby shortening the length of the rotor assembly in the axial direction, reducing the manufacturing cost and the weight of the fan.

Further, referring to fig. 1 in combination with fig. 5 and fig. 6, an end surface of the insertion hole of the movable impeller 50 near the end where the bearing unit 22 extends is defined as an insertion hole end surface N, and an end surface of the outer hub of the movable impeller 50 near the end where the bearing unit 22 extends is defined as an outer hub end surface M; the distance between the end face N of the insertion hole and the end face of the end, where the bearing unit 22 extends, is L1, and the distance between the end face N of the insertion hole and the end face M of the outer hub is L2; the ratio of L1 to L2 has the following value range: 0.07 ~ 0.18, the ratio of L1 and L2 can be 0.09, 0.12 and 0.15, the setting is such that: the greatest possible space saving is possible. Specifically, the value of L1 is as small as possible, the insertion hole end surface N is infinitely close to but not in contact with the end surface of the end of the bearing unit 22, and during operation, the insertion hole end surface N rotates at a high speed, while the end surface of the end of the bearing unit 22 is fixed.

Further, referring to fig. 4 in conjunction with fig. 5, the bearing unit 22 includes a sleeve 222 and a pair of bearings 221 fastened at both axial ends of the sleeve 222; the rotating shaft 21 is rotatably disposed in the sleeve 222 through a bearing 221. The bearing 221 is a deep groove ball bearing, the bearing 221 is located in a cylinder cavity of the sleeve 222, and the sleeve 222 is pressed in the first circular column 131 and is in interference fit with the first circular column 131; the outer ring of the bearing 221 is in interference connection with the wall of the sleeve 222, and the inner ring is in interference connection with the rotating shaft 21.

Further, the bearing unit 22 further includes a spring 223 and a washer 224 located in the cylindrical cavity of the sleeve 222; wherein, the washer 224 is abutted against the outer ring of the bearing 221 under the elastic force of the spring 223, and the purpose of the arrangement is as follows: so that the rolling elements of the bearing 221 are always located within the track of the bearing 221.

Further, referring to fig. 16, the diameter of the inner ring of the circular groove of the fixed impeller 112 is A3, the diameter of the outer ring is a4, and the diameter of the outer ring of the base shell 11 is a5, where a5 is the maximum outer diameter of the housing structure 10, and a1, a2, A3, a4, and a5 satisfy the following relations: a1 < A2 < A3 < A4 < A5. The inner diameter of the first circular column 131 of the bearing bracket 13 is A6, the diameter of the outer ring of the magnet 24 is A7, A7 is less than A6, and A6 is less than A1; the value range of A6 is: 12-18 mm to fit bearings 221 of appropriate size; the value range of A7 is: 10-15 mm to make the appearance of motor small and exquisite, the quality is lighter. Referring to fig. 5, the axial distance between the bearing unit 22 and the magnet 24 is L4, L4 is the length of the shaft shoulder of the rotating shaft 21 in the axial direction, L1 < L4, and the ratio of L1 to L4 ranges from: 0.05-0.2, the transmission effect is optimal at the moment; the value range of L1 is: 0.2-3 mm, wherein L1 can be 0.5mm, 1mm, 1.5mm, 2mm and 2.5 mm; the value range of L4 is: 3-10 mm, wherein L4 can be 4mm, 5mm, 6mm, 7mm, 8mm and 9 mm; the stator assembly 30 can run more reliably for a long time while ensuring the compact structure, and therefore, the structure of the motor is more reliable while ensuring the compact structure.

In the present application, referring to fig. 17 to 19, the stator assembly 30 includes a stator core 31, a bobbin 32 supporting the stator core 31, and windings in winding slots. The stator core 31 includes: the stator comprises an annular yoke part and a plurality of stator tooth parts 313, wherein the shape of the annular yoke part in the radial direction is a non-full circle, the annular yoke part comprises a first sub-yoke part 311 and a second sub-yoke part 312 which are different in shape, the first sub-yoke part 311 and the second sub-yoke part 312 enclose the annular yoke part which forms a closed ring shape, and the first sub-yoke part 311 is coaxially arranged; the stator teeth 313 are arranged on the annular yoke, the stator teeth 313 extend along the radial direction of the annular yoke and are distributed at equal intervals along the circumferential direction of the annular yoke, and winding slots are formed between every two adjacent stator teeth 313. The tooth tops of the stator teeth 313 are arc-shaped, and a gap for winding the winding wire on the stator teeth 313 is reserved between the tooth tops of the adjacent stator teeth 313.

Further, referring to fig. 19, a core inner hole is formed around the tooth top of the stator tooth portion 313, the core inner hole is an inner hole of the stator core 31, the first sub-yoke portion 311 has a central axis, a radius of the core inner hole is defined as R2, a maximum radius between an outer circumferential wall of the first sub-yoke portion 311 and the central axis is defined as R1, and a minimum distance between the central axis and an outer wall of the second sub-yoke portion 312 is defined as L0; wherein L0, R1 and R2 satisfy: L0/R1 is more than or equal to 0.7 and less than or equal to 0.98, and R2/R1 is more than or equal to 0.3 and less than or equal to 0.45. Preferably, specific values of L0/R1 can be 0.75, 0.80, 0.85, 0.90 and 0.95, specific values of R2/R1 can be 0.35, 0.38, 0.40 and 0.42, and when L0/R1 and R2/R1 are under the above values, the efficient and light-weight effect of the fan is better.

In the technical application provided by the application, the size and the weight of the fan are reduced under the condition of constant output power by defining the structure of the stator core 31 and by defining the ratio range among the radius R2 of the core inner hole, the maximum radius R1 between the outer circumferential wall of the first sub-yoke part 311 and the central axis and the minimum distance L0 between the central axis and the outer wall of the second sub-yoke part 312.

Further, referring to fig. 19, the minimum yoke thickness of the ring-shaped yoke is defined as L5, and the tooth thickness of the stator teeth 313 is defined as L6; wherein, L5 and L6 satisfy: L6/L5 is more than or equal to 1.6 and less than or equal to 2.2. Specific values of L6/L5 may be 1.7, 1.8, 1.9, 2.0, and 2.1, and when L6/L5 is above, the stator core 31 has better structural strength and better capacity of accommodating winding wires. Specifically, assuming that the sum of the numbers of the first and second sub-yokes 311 and 312 is 6, and each sub-yoke has a thickness, the thicknesses of the 6 sub-yokes are H1, H2, H3, H4, H5, and H6, respectively, and the smallest value among H1 to H6 is L5.

Further, the thicknesses of the sub-yoke parts of the annular yoke part are different, wherein the thickness value of the sub-yoke part with the smallest thickness is L5; alternatively, the thicknesses of the sub-yoke portions of the annular yoke portion are all the same, and the thickness of each sub-yoke portion is equal to or greater than L5. The thickness of each sub-yoke portion of the annular yoke portion can be determined according to specific practical use conditions.

Further, referring to fig. 18 in combination with fig. 19, the first sub-yoke portion 311 is shaped like an arc in the radial direction of the ring yoke portion, and the second sub-yoke portion 312 is shaped like a straight line or a broken line in the radial direction of the ring yoke portion; the first sub-yoke 311 and the second sub-yoke 312 are distributed at intervals, the stator teeth 313 are disposed on the second sub-yoke 312, and preferably, the stator teeth 313 are located at a midpoint of the second sub-yoke 312. When the angle between the stator tooth 313 and the second sub-yoke 312 is a right angle, the second sub-yoke 312 is linear in the annular yoke radial direction; when the angle between the stator teeth 313 and the second sub-yoke 312 is an obtuse angle, the second sub-yoke 312 is zigzag-shaped (not shown) in the radial direction of the ring yoke. The angle between the stator tooth 313 and the second sub-yoke 312 is not suggested to be set to be an acute angle, which reduces the volume of the winding slot of the stator core and is not favorable for winding.

Further, the stator core 31 is formed by splicing n sub-cores having the same shape and size, where n is the same as the number of teeth of the stator teeth 313. The stator core 31 is formed by laminating at least two sheets in the thickness direction, and the sheets are obtained by pressing amorphous material powder or soft magnetic material and then performing heat treatment.

In the present application, please refer to fig. 17, the frame 32 is separately disposed, and includes a first frame 321 clamped on one end of the stator core 31 and a second frame 322 clamped on the opposite end of the stator core 31. Specifically, the framework 32 is matched with the stator core 31 and covers the winding slot of the stator core 31 to prevent the winding wire from directly contacting the stator core 31, so that the insulation is enhanced, and the stator core 31 is prevented from cutting the enamel coating of the winding wire; in addition, the bobbin 32 also facilitates winding of the winding wire onto the stator teeth 313. The framework 32 is provided with a mounting boss corresponding to the screw hole column 113, and the framework 32 is connected with the base shell 11 through a bolt.

It should be understood that the above specific applications are only examples of the installation structure of the movable impeller and the rotating shaft in the present application, and those skilled in the art may make adaptive adjustments according to actual situations, which are not described herein again.

To sum up, in this application the jack can and the pivot between form interference fit and clearance fit, adopt glue connected mode for clearance fit's regional section between pivot and the jack, above-mentioned mounting structure can be fine be applicable to the high rotational speed's of pivot operating mode, have simple structure, connect reliable and stable advantage. Furthermore, by limiting the structure of the stator core and limiting the ratio range of the radius R2 of the inner hole of the core, the maximum radius R1 between the outer circumferential wall of the first sub-yoke part and the central axis and the minimum distance L0 between the central axis and the outer wall of the second sub-yoke part, the volume and the weight of the fan are reduced under the condition that the output power of the fan is constant, and therefore the purpose of high efficiency and light weight of the fan is achieved.

While the embodiments of the present application have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in a variety of fields suitable for this application, and further modifications will be readily apparent to those skilled in the art, and it is therefore not intended to be limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (10)

1. The utility model provides a mounting structure of movable vane wheel and pivot which characterized in that includes:

a rotating shaft; and

the movable impeller is arranged at one end part of the rotating shaft along the axial direction of the rotating shaft, and a jack for the insertion of the rotating shaft is formed on the movable impeller;

the plug hole is a multi-stage stepped hole, a shaft shoulder matched with the stepped hole is arranged at the end of the rotating shaft, and an interference fit area section and a clearance fit area section suitable for glue connection are formed between the shaft shoulder and the plug hole.

2. The mounting structure according to claim 1,

the jack is tertiary step hole, has coaxial setting and the first hole portion, second hole portion and the third hole portion that the aperture is crescent gradually, motor setting is kept away from to first hole portion.

3. The mounting structure according to claim 2,

the first hole portion with be clearance fit between the pivot, the second hole portion with be interference fit between the pivot, the third hole portion with be clearance fit between the pivot.

4. The mounting structure according to claim 2,

the shaft shoulder is arranged on one end of the rotating shaft, and a thin shaft neck in clearance fit with the first hole part is formed on one end of the rotating shaft through the shaft shoulder.

5. The mounting structure according to claim 4,

the joint of the first hole part and the second hole part is provided with a hole shoulder, and a space K for storing glue exists between the hole shoulder and the shaft shoulder in the axial direction.

6. The mounting structure according to claim 5,

the value range of the spacing K is 0.2mm < K <0.5 mm.

7. The mounting structure according to claim 1,

a cavity is formed in the middle lower portion of the movable impeller, a plurality of rib plates are arranged in the cavity, and the rib plates are distributed on the periphery of the insertion hole at equal intervals along the circumferential direction of the insertion hole.

8. The mounting structure according to claim 1,

the movable impeller comprises a movable impeller base and a plurality of vanes formed on the outer wall of the movable impeller base, wherein the movable impeller base is generally conical, and the conical surface of the movable impeller base is a curved surface.

9. The mounting structure according to claim 8,

the movable impeller base is provided with a narrow end part and a wide end part; wherein the edges of the plurality of tabs at the narrow end lie on the same circle C1; the edges of the plurality of tabs at the wide end lie on the same circle C2.

10. The mounting structure according to claim 9,

the diameter ratio of the circle C1 to the circle C2 is 0.35-0.75.

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