CN217010666U - Birotor brushless motor for pulsator washing machine and mounting structure thereof in washing machine - Google Patents

Abstract

The utility model relates to a double-rotor brushless motor for a pulsator washing machine and a mounting structure thereof in the washing machine, wherein an inner coil and an outer coil are respectively arranged at the inner side and the outer side of a stator, a closed magnetic loop is formed by a magnetic field generated by the inner coil and an inner rotor, the inner rotor is driven to rotate, a closed magnetic loop is formed by the magnetic field generated by the outer coil and the outer rotor, and the outer rotor is driven to rotate, so that the independent drive control of the inner rotor and the outer rotor is realized, and because the double-rotor brushless motor is provided with two rotors capable of independently outputting, when the pulsator washing machine is used for driving a pulsator and an inner cylinder, a clutch can be cancelled, the pulsator is directly and fixedly connected with an inner rotating shaft of the inner rotor, and the inner cylinder is directly and fixedly connected with the outer rotor, thereby the overall height and the gravity center height of the washing machine can be reduced, and the working stability of the washing machine can be improved, meanwhile, noise caused by clutch switching and transmission is eliminated, and user experience is greatly improved.

Description

Birotor brushless motor for pulsator washing machine and mounting structure thereof in washing machine

Technical Field

The utility model belongs to the technical field of motors, and particularly relates to a dual-rotor brushless motor for a pulsator washing machine and a mounting structure of the dual-rotor brushless motor in the washing machine.

Background

The pulsator washing machine is a vertical washing machine, which mainly comprises a shell, an outer barrel fixedly connected in the shell and used for containing water, an inner barrel rotatably connected in the outer barrel and used for containing clothes, a pulsator rotatably connected to the bottom surface of the inner barrel and used for stirring water flow and clothes, and a driving mechanism for driving the inner barrel and the pulsator to rotate. Meanwhile, due to the fact that the clutch is installed, when the washing machine operates, large noise can be generated, particularly when functions are switched, the action of the clutch can generate large noise, and user experience is poor.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: the utility model provides a birotor brushless motor for rotary drum washing machine, this motor solve present rotary drum washing machine focus height, the poor, the big technical problem of noise at work of job stabilization nature.

In order to solve the technical problems, the utility model adopts the technical scheme that: a double-rotor brushless motor for a pulsator washing machine comprises an inner rotor, a stator and an outer rotor, wherein the stator is sleeved outside the inner rotor, the outer rotor is sleeved outside the stator, air gaps are formed between the inner rotor and the stator and between the outer rotor and the stator, the stator comprises a back yoke, a plurality of inner teeth and a plurality of outer teeth, the inner teeth are circumferentially and uniformly distributed on the inner circumferential surface of the back yoke, the outer teeth are circumferentially and uniformly distributed on the outer circumferential surface of the back yoke, inner coils are wound on the inner teeth, outer coils are wound on the outer teeth, the inner rotor comprises an inner rotating shaft, a central iron core and a plurality of inner magnetic tiles, the central iron core is fixedly sleeved on the inner rotating shaft, the central iron core is circumferentially and uniformly distributed on the periphery of the inner rotating shaft and connected with the central iron core, and the outer rotor comprises an outer shell and a plurality of outer magnetic tiles, and the outer magnetic tiles are circumferentially and uniformly distributed on the inner circumferential surface of the outer shell.

As a preferred scheme, the upper end of the back yoke is fixedly connected with a top cover, the lower end of the back yoke is fixedly connected with a bottom cover, a front axle hole is formed in the center of the top cover, the inner rotating shaft is respectively and rotatably connected with the top cover and the bottom cover, and the front end of the inner rotating shaft extends out of the top cover.

As a preferred scheme, at least three axially extending through holes are circumferentially and uniformly distributed on the back yoke, the top cover is provided with upper positioning holes corresponding to the through holes one by one, the bottom cover is provided with lower positioning holes corresponding to the through holes one by one, any through hole is coaxially arranged with the corresponding upper positioning hole and the corresponding lower positioning hole, the top cover and the bottom cover are respectively and fixedly connected to the back yoke through bolts corresponding to the through holes one by one, and the bolts are in threaded connection with nuts after sequentially penetrating through the top cover, the back yoke and the bottom cover.

As a preferred scheme, top cap upper end center is connected with a boss, and the boss center is connected with a perpendicularly and supports the pipe, supports pipe and the coaxial setting in preceding shaft hole, the interior pivot front end passes and supports the pipe and stretch out outside the support pipe, the shell body includes the cylinder and connects the annular carousel in cylinder one end, and the annular carousel cover is established outside the support pipe and with support the pipe rotation and be connected.

As a preferred scheme, a sleeve is integrally formed in the center of the upper end of the rotary table, the sleeve and the supporting circular tube are coaxially arranged, a flange plate is connected to the upper end of the sleeve, the upper end of the inner rotary shaft extends upwards out of the sleeve, and a plurality of positioning columns which vertically extend downwards are connected to the lower end face of the bottom cover.

As a preferred scheme, a plurality of top end air inlets are uniformly distributed in the circumferential direction on the rotary table, the outer magnetic tiles are attached to the inner circumferential surface of the lower end of the cylinder, a plurality of blades extending radially inwards are uniformly distributed in the circumferential direction on the inner circumferential surface of the upper end of the cylinder, the top cover is fastened to the top end of the stator and forms an upper heat dissipation cavity with the top end of the stator, the bottom cover is fastened to the bottom end of the stator and forms a lower heat dissipation cavity with the bottom end of the stator, a plurality of side air inlets are uniformly distributed in the circumferential direction on the side wall of the top cover, the side air inlets are opposite to the blades and are communicated with the upper heat dissipation cavity, a plurality of side air outlets are uniformly distributed in the circumferential direction on the side wall of the bottom cover, and the side air outlets are communicated with the lower heat dissipation cavity.

The utility model further aims to solve the technical problems that: the utility model provides an above-mentioned birotor brushless motor mounting structure in washing machine to solve present rotary drum washing machine focus height, the poor, the big technical problem of noise of operating of job stabilization nature.

In order to solve the technical problems, the utility model adopts the technical scheme that: the double-rotor brushless motor is characterized in that the double-rotor brushless motor is an installation structure of the double-rotor brushless motor in a washing machine, an inner rotary shaft of the double-rotor brushless motor is inserted into a wave wheel and fixedly connected with the wave wheel, the inner rotary shaft drives the wave wheel to rotate, an outer rotor is fixedly connected with the bottom of an inner barrel of the washing machine and drives the inner barrel to rotate, and the lower end of a stator is fixedly connected to a fixing frame at the bottom of the washing machine.

As a preferable scheme, the outer rotor is fixedly connected with the lower end of the inner cylinder through a flange plate.

As a preferred scheme, the stator is fixedly connected with the fixing frame through a bottom cover at the lower end of the stator, connecting holes corresponding to the positioning columns on the bottom cover one to one are formed in the fixing frame, the positioning columns are correspondingly inserted into the connecting holes to realize positioning, locking holes corresponding to the lower positioning holes one to one are further formed in the fixing frame, and the bolts sequentially penetrate through the upper positioning holes, the through holes, the lower positioning holes and the locking holes from top to bottom and are locked through nuts.

The utility model has the beneficial effects that: the utility model improves the structure of the double-rotor brushless motor, the inner side and the outer side of the stator are respectively provided with the inner coil and the outer coil, a closed magnetic loop is formed by the magnetic field generated by the inner coil and the inner rotor, the inner rotor is driven to rotate, the closed magnetic loop is formed by the magnetic field generated by the outer coil and the outer rotor, and the outer rotor is driven to rotate, so that the independent drive control of the inner rotor and the outer rotor is realized, and the double-rotor brushless motor has two rotors capable of independently outputting, therefore, when the double-rotor brushless motor is used for driving the impeller and the inner cylinder of the impeller washing machine, the clutch can be cancelled, the direct connection drive is adopted, namely, the impeller is directly and fixedly connected with the inner rotating shaft of the inner rotor, and the inner cylinder is directly and fixedly connected with the outer rotor, thereby not only reducing the whole height and the gravity center height of the washing machine, improving the working stability of the washing machine, but also eliminating the noise caused by the switching and the transmission of the clutch, the user experience is greatly improved.

The installation structure of the double-rotor brushless motor in the washing machine is a structure for directly connecting the motor with the impeller and the inner cylinder, has simple connection structure and convenient installation, and particularly, the connection structure of the stator and the fixed frame is locked by nuts after bolts sequentially penetrate through the top cover, the back yoke, the bottom cover and the fixed frame, thereby greatly improving the connection stability of the motor and the fixed frame and reducing the noise generated in the operation process of the double-rotor brushless motor. The mode that the birotor brushless motor is directly connected with the impeller and the inner barrel is adopted to eliminate the clutch, the height and the gravity center height of the impeller washing machine are reduced, the working stability of the washing machine is improved, and the noise caused by clutch switching and transmission is eliminated.

Drawings

The following detailed description of embodiments of the utility model is provided in conjunction with the appended drawings, in which:

fig. 1 is a schematic half-sectional view of a dual-rotor brushless motor applied to a pulsator washing machine according to the present invention;

FIG. 2 is a schematic view of the connection structure of the top cover, the stator and the bottom cover;

FIG. 3 is a schematic view of the connection structure of the dual-rotor brushless motor in the pulsator washing machine according to the present invention;

fig. 4 is a schematic view of a specific connection structure between the dual-rotor brushless motor and the fixing frame according to the present invention;

FIG. 5 is a schematic view of a particular construction of the inner rotor of the present invention;

FIG. 6 is a top view of the stator of the present invention;

in FIGS. 1 to 6: 1. inner rotor 101, central iron core 102, inner magnetic tile 2, stator 201, back yoke 202, inner teeth 203, outer teeth 204, inner coil 205, outer coil 3, outer rotor 301, outer shell 302, outer magnetic tile 301a, cylinder 301b, rotary table 4, inner rotary shaft 5, top cover 6, bottom cover 7, front shaft hole 8, rear shaft hole 9, boss 10, support circular tube 11, the fan blade comprises a through hole, 12, an upper positioning hole, 13, a lower positioning hole, 14, a bolt, 15, a nut, 16, a sleeve, 17, a flange plate, 18, a positioning column, 19, a top air inlet, 20, a blade, 21, an upper heat dissipation cavity, 22, a lower heat dissipation cavity, 23, a side air inlet, 24, a side air outlet, 25, a wave wheel, 26, an inner cylinder, 27, a fixing frame, 28, a connecting hole, 29, a locking hole, 30, a jack, 31, a first bearing, 32 and a second bearing.

Detailed Description

Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Example 1:

as shown in fig. 1 to 6, the dual-rotor brushless motor for the pulsator washing machine comprises an inner rotor 1, a stator 2 sleeved outside the inner rotor 1, and an outer rotor 3 sleeved outside the stator 2, wherein air gaps are provided between the inner rotor 1 and the stator 2, and between the outer rotor 3 and the stator 2, as shown in fig. 6, the stator 2 comprises a back yoke 201, a plurality of inner teeth 202 circumferentially and uniformly distributed on the inner circumferential surface of the back yoke 201, a plurality of outer teeth 203 circumferentially and uniformly distributed on the outer circumferential surface of the back yoke 201, each inner tooth 202 is wound with an inner coil 204, each outer tooth 203 is wound with an outer coil 205, the inner rotor 1 comprises an inner rotating shaft 4, a central iron core 101 fixedly sleeved on the inner rotating shaft 4, and a plurality of inner magnetic shoes 102 circumferentially and uniformly distributed around the inner rotating shaft 4 and connected with the central iron core 101, the inner magnetic shoes 102 can be attached to the outer circumferential surface of the central iron core 10, or as shown in fig. 5, jacks 30 circumferentially and uniformly distributed around the outer edge of the central iron core 101 are provided, the inner magnetic shoes 102 are inserted into the insertion holes in a one-to-one correspondence, so that the inner magnetic shoes 102 and the central iron core 101 are connected more reliably. The outer rotor 3 includes an outer shell 301 and a plurality of outer magnetic shoes 302 circumferentially and uniformly distributed on an inner circumferential surface of the outer shell 301.

In this embodiment, the back yoke 201, the internal teeth 202 and the external teeth 203 together form a stator core, and the stator core preferably adopts a plastic-coated structure, has high voltage withstanding grade, and is suitable for different application fields of high voltage and low voltage. The motor assembly process can be simplified, and the working stability of the motor is improved.

In this embodiment, the magnetic field generated by each inner coil 204 after being conducted drives the inner rotor 1 to rotate, the magnetic field generated by each outer coil 205 after being conducted drives the outer rotor 3 to rotate, and the inner coil 204 and the outer coil 205 can be independently controlled, so as to control the torque output by the inner rotor 1 and the torque output by the outer rotor 3 respectively. When the double-rotor brushless motor is applied to the impeller washing machine, the inner rotor 1 can be directly used for driving the impeller 25, and the outer rotor 3 is used for driving the inner barrel 26, so that a clutch used in the transmission impeller washing machine is eliminated.

As shown in fig. 1, in the present embodiment, a top cover 5 is fixedly connected to an upper end of a stator back yoke 201, a bottom cover 6 is fixedly connected to a lower end of the back yoke 201, a front shaft hole 7 is formed in the center of the top cover 5, a rear shaft hole 8 coaxially disposed with the front shaft hole 7 is formed in the center of the bottom cover 6, an inner rotary shaft 4 is rotatably connected to the top cover 5 and the bottom cover 6 through a first bearing 31, and a front end of the inner rotary shaft 4 extends out of the top cover 5.

The top cover 5 and the bottom cover 6 form a support for supporting and positioning the inner rotor 1, so that the inner rotor 1 can be stably positioned in the center of the stator 2 for rotation.

As shown in fig. 2, at least three axially extending through holes 11 are circumferentially and uniformly distributed on a back yoke 201 of the stator 2, an upper positioning hole 12 corresponding to the through holes 11 one to one is formed in the top cover 5, a lower positioning hole 13 corresponding to the through holes 11 one to one is formed in the bottom cover 6, any through hole 11 is coaxially arranged with the corresponding upper positioning hole 12 and the corresponding lower positioning hole 13, the top cover 5 and the bottom cover 6 are respectively fixedly connected to the back yoke 201 through bolts 14 corresponding to the through holes 11 one to one, and the bolts 14 are in threaded connection with nuts 15 after sequentially penetrating through the top cover 5, the back yoke 201 and the bottom cover 6. The top cover 5, the back yoke 201 and the bottom cover 6 are fixed by the bolts 14 penetrating through the top cover 5, the back yoke 201 and the bottom cover 6, so that the connection stability of the top cover 5, the bottom cover 6 and the stator 2 is greatly improved, the rotation stability of the inner rotor 1 is further improved, and the rotation noise of the inner rotor 1 is reduced. Meanwhile, the connection mode saves more space and can further reduce the volume of the double-rotor brushless motor.

As shown in fig. 1 and fig. 2, in this embodiment, the center of the upper end of the top cover 5 is connected with a boss 9, the center of the boss 9 is vertically connected with a supporting circular tube 10, the supporting circular tube 10 is coaxial with the front shaft hole 7, the front end of the inner rotating shaft 4 passes through the supporting circular tube 10 and extends out of the supporting circular tube 10, the outer shell 301 includes a cylinder 301a and an annular turntable 301b connected to one end of the cylinder 301a, the annular turntable 301b is sleeved outside the supporting circular tube 10 and is rotatably connected with the supporting circular tube 10 through a second bearing 32, and the lower end of the second bearing 32 is abutted to the boss 9. A sleeve 16 is integrally formed at the center of the upper end of the rotary disc 301b, the sleeve 16 and the supporting circular tube 10 are coaxially arranged, the upper end of the sleeve 16 is connected with a flange 17, a second bearing 32 is also arranged in the sleeve 16, and the sleeve 16 is rotatably connected with the supporting circular tube 10 through the second bearing 32. The upper end of the inner rotating shaft 4 extends upwards out of the sleeve 16, and the lower end surface of the bottom cover 6 is connected with a plurality of positioning columns 18 extending vertically downwards. The positioning column 18 is used for connecting a fixed frame 27 in the washing machine.

In this embodiment, the supporting circular tube 10, the boss 9 and the top cover 5 are integrally formed, the supporting circular tube 10, the boss 9 and the top cover 5 realize the separation of the rotation of the inner rotor 1 and the outer rotor 3, and meanwhile, the supporting circular tube 10 indirectly increases the second bearing 32 by the structure, so that the bearing capacity of the outer rotor 3 can be increased. Through the arrangement of the sleeve 16, the outer rotor 3 can be rotatably connected with the supporting circular tube 10 through the two second bearings 32, so that the bearing force is uniformly distributed, the structural failure problems such as fracture and the like are not easy to occur, and the structure is safe and reliable.

As shown in fig. 1, a plurality of top air inlets 19 are circumferentially and uniformly distributed on the turntable 301b, the outer magnetic tiles 302 are attached to the inner circumferential surface of the lower end of the cylinder 301a, a plurality of blades 20 radially extending inwards are circumferentially and uniformly distributed on the inner circumferential surface of the upper end of the cylinder 301a, the top cover 5 is fastened to the top end of the stator 2 and forms an upper heat dissipation chamber 21 with the top end of the stator 2, the bottom cover 6 is fastened to the bottom end of the stator 2 and forms a lower heat dissipation chamber 22 with the bottom end of the stator 2, a plurality of circumferentially and uniformly distributed side air inlets 23 are formed on the side wall of the top cover 5, the side air inlets 23 are opposite to the blades 20 and are communicated with the upper heat dissipation chamber 21, a plurality of circumferentially and uniformly distributed side air outlets 24 are formed on the side wall of the bottom cover 6, and the side air outlets 24 are communicated with the lower heat dissipation chamber 22.

The inner rotor 1 of the double-rotor brushless motor drives the impeller 25 to rotate, so although the torque is large, the rotating speed is low, the heat productivity is not large, the outer rotor 3 drives the inner cylinder 26 to rotate, the outer rotor is mainly used for clothes dehydration, the rotating speed is high, the torque is large, the heat productivity of the peripheral coil 205 is also large, the top air inlet 19 is formed in the rotary disc 301b, cold air outside the motor can be brought into the motor when the outer rotor 3 rotates at high speed, the cold air flows downwards from an air gap between the outer rotor 3 and the stator 2, the air cooling is carried out on the outer coil 205 on the stator 2, the working temperature of the motor is reduced, the working stability of the motor is improved, and the service life of the motor is prolonged.

Meanwhile, the blades 20 are arranged on the inner wall of the upper end of the cylinder 301a of the outer rotor 3, the side air inlet 23 is arranged on the side wall of the top cover 5, and the side air outlet 24 is arranged on the side wall of the bottom cover 6, so that in the high-speed rotation process of the outer rotor 3, the blades 20 can blow air between the outer rotor 3 and the stator 2 into the upper heat dissipation cavity 21, cold air flows downwards along an air gap between the stator 2 and the inner rotor 1 and a tooth space between the inner teeth 202, cools the inner coil 204, and is finally discharged from the side air outlet 24.

Example 2:

referring to fig. 3 and 4, in the structure for mounting the dual-rotor brushless motor in the washing machine, the dual-rotor brushless motor adopted in this embodiment is the dual-rotor brushless motor described in embodiment 1, the inner rotary shaft 4 of the dual-rotor brushless motor is inserted into the pulsator 25 and fixedly connected with the pulsator 25, the inner rotary shaft 4 drives the pulsator 25 to rotate, the outer rotor 3 is fixedly connected with the bottom of the inner drum 26 of the washing machine through the flange 17 and drives the inner drum 26 to rotate, and the lower end of the stator 2 is fixedly connected to the fixing frame 27 at the bottom of the washing machine. Specifically, the stator 2 in this embodiment is fixedly connected to the fixing frame 27 through the bottom cover 6 at the lower end thereof, the fixing frame 27 is provided with connecting holes 28 corresponding to the positioning posts 18 on the bottom cover 6 one by one, the positioning posts 18 are inserted into the connecting holes 28 one by one to realize positioning, the fixing frame 27 is further provided with locking holes 29 corresponding to the lower positioning holes one by one, and the bolts 14 sequentially pass through the upper positioning holes 12, the through holes 11, the lower positioning holes 13 and the locking holes 29 from top to bottom and are locked by the nuts 15.

The working process of the utility model is as follows: firstly, the dual-rotor brushless motor described in embodiment 1 is installed in a pulsator washing machine as in embodiment 2, and during washing, each inner coil 204 can be individually energized, so that the inner rotor 1 works at a predetermined rotation speed and in a predetermined rotation direction, and the pulsator 25 is driven to agitate washing liquid in the washing machine to scrub the laundry, or the inner coil 204 and the outer coil 205 can be energized simultaneously, the inner coil 204 drives the inner rotor 1 to rotate, the inner rotary shaft 4 of the inner rotor 1 drives the pulsator 25 to rotate, the outer coil 204 drives the outer rotor 3 to rotate, the outer rotor 3 drives the inner drum 26 to rotate, and the inner drum 26 and the pulsator 25 can cooperate with each other to rotate in opposite directions to scrub the laundry, thereby improving the washing effect.

When the clothes are dehydrated, the external coil 205 can be electrified independently, the external coil 205 drives the external rotor 3 to rotate at a high speed, the clothes are dehydrated, if the static impeller 25 blocks the clothes in the dehydration process, the internal coil 204 can be electrified at the same time, and the internal coil 204 drives the internal rotor 1 to rotate synchronously with the external rotor 3, so that the dehydration effect is improved.

The above embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments in use, and are not intended to limit the utility model; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.

Claims (9)

1. A double-rotor brushless motor for a pulsator washing machine comprises an inner rotor (1), a stator (2) sleeved outside the inner rotor (1), and an outer rotor (3) sleeved outside the stator (2), wherein air gaps are respectively arranged between the inner rotor (1) and the stator (2) and between the outer rotor (3) and the stator (2), the double-rotor brushless motor is characterized in that the stator (2) comprises a back yoke (201), a plurality of inner teeth (202) circumferentially and uniformly distributed on the inner circumferential surface of the back yoke (201), and a plurality of outer teeth (203) circumferentially and uniformly distributed on the outer circumferential surface of the back yoke (201), each inner tooth (202) is wound with an inner coil (204), each outer tooth (203) is wound with an outer coil (205), the inner rotor (1) comprises an inner rotating shaft (4), a central iron core (101) fixedly sleeved on the inner rotating shaft (4), and a plurality of inner magnetic shoes (102) circumferentially and uniformly distributed around the inner rotating shaft (4) and connected with the central iron core (101), the outer rotor (3) comprises an outer shell (301) and a plurality of outer magnetic tiles (302) which are uniformly distributed on the inner circumferential surface of the outer shell (301) in the circumferential direction.

2. The birotor brushless motor as claimed in claim 1, wherein the upper end of the back yoke (201) is fixedly connected with a top cover (5), the lower end of the back yoke (201) is fixedly connected with a bottom cover (6), a front axle hole (7) is formed in the center of the top cover (5), the inner rotating shaft (4) is rotatably connected with the top cover (5) and the bottom cover (6) respectively, and the front end of the inner rotating shaft (4) extends out of the top cover (5).

3. The birotor brushless motor of claim 2, wherein at least three axially extending through holes (11) are uniformly distributed in the circumferential direction of the back yoke (201), the top cover (5) is provided with upper positioning holes (12) corresponding to the through holes (11) one by one, the bottom cover (6) is provided with lower positioning holes (13) corresponding to the through holes (11) one by one, any through hole (11) is coaxially arranged with the corresponding upper positioning hole (12) and the corresponding lower positioning hole (13), the top cover (5) and the bottom cover (6) are fixedly connected to the back yoke (201) through bolts (14) corresponding to the through holes (11) one by one, and the bolts (14) sequentially penetrate through the top cover (5), the back yoke (201) and the bottom cover (6) and are in threaded connection with nuts (15).

4. The birotor brushless motor according to claim 2, wherein a boss (9) is connected to the center of the upper end of the top cover (5), a supporting circular tube (10) is vertically connected to the center of the boss (9), the supporting circular tube (10) and the front shaft hole (7) are coaxially arranged, the front end of the inner rotating shaft (4) penetrates through the supporting circular tube (10) and extends out of the supporting circular tube (10), the outer shell (301) comprises a cylinder (301 a) and an annular turntable (301 b) connected to one end of the cylinder (301 a), and the annular turntable (301 b) is sleeved outside the supporting circular tube (10) and is rotatably connected with the supporting circular tube (10).

5. The birotor brushless motor according to claim 4, wherein a sleeve (16) is integrally formed at the center of the upper end of the turntable (301 b), the sleeve (16) is coaxially arranged with the circular supporting tube (10), a flange (17) is connected to the upper end of the sleeve (16), the upper end of the inner rotating shaft (4) extends upwards out of the sleeve (16), and a plurality of positioning posts (18) extending vertically downwards are connected to the lower end surface of the bottom cover (6).

6. The birotor brushless motor of claim 5, wherein a plurality of top end air inlets (19) are uniformly distributed on the rotary table (301 b) in the circumferential direction, the outer magnetic tiles (302) are attached to the inner circumferential surface of the lower end of the cylinder body (301 a), a plurality of blades (20) extending radially inwards are uniformly distributed on the inner circumferential surface of the upper end of the cylinder body (301 a) in the circumferential direction, the top cover (5) is fastened to the top end of the stator (2) and forms an upper heat dissipation chamber (21) with the top end of the stator (2), the bottom cover (6) is fastened to the bottom end of the stator (2) and forms a lower heat dissipation chamber (22) with the bottom end of the stator (2), a plurality of side air inlets (23) are uniformly distributed in the circumferential direction are formed on the side wall of the top cover (5), the side air inlets (23) are opposite to the blades (20) and are communicated with the upper heat dissipation chamber (21), a plurality of side air outlets (24) are uniformly distributed in the circumferential direction are formed on the side wall of the bottom cover (6), the side air outlet (24) is communicated with the lower heat dissipation cavity (22).

7. The installation structure of the birotor brushless motor in the washing machine is characterized in that the birotor brushless motor is the birotor brushless motor in any claim 1 to 6, an inner rotating shaft (4) of the birotor brushless motor is inserted into the impeller (25) and is fixedly connected with the impeller (25), the inner rotating shaft (4) drives the impeller (25) to rotate, the outer rotor (3) is fixedly connected with the bottom of the inner barrel (26) of the washing machine and drives the inner barrel (26) to rotate, and the lower end of the stator (2) is fixedly connected on a fixing frame (27) at the bottom of the washing machine.

8. The structure of claim 7, in which the outer rotor (3) is fixedly connected to the lower end of the inner tub (26) by means of a flange (17).

9. The mounting structure of the birotor brushless motor in the washing machine according to claim 7, wherein the stator (2) is fixedly connected with a fixing frame (27) through a bottom cover (6) at the lower end of the stator, the fixing frame (27) is provided with connecting holes (28) corresponding to the positioning columns (18) on the bottom cover (6) one by one, the positioning columns (18) are correspondingly inserted into the connecting holes (28) to realize positioning, the fixing frame (27) is further provided with locking holes (29) corresponding to the lower positioning holes one by one, and the bolts (14) sequentially penetrate through the upper positioning holes (12), the through holes (11), the lower positioning holes (13) and the locking holes (29) from top to bottom and are locked through nuts (15).

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