CN217010492U - Sound wave motor with external coil and electric toothbrush - Google Patents

Abstract

The utility model provides an acoustic wave motor with an external coil and an electric toothbrush, which comprise a shell, a stator assembly, a rotor assembly and an elastic torsion piece, wherein the shell is provided with a stator core; the stator component comprises a U-shaped magnetizer and a coil arranged in the middle of the U-shaped magnetizer, two side edges of the U-shaped magnetizer penetrate into the shell respectively, and the coil is positioned outside the shell; the rotor assembly comprises a rotating frame and magnetic steel embedded in the center of the rotating frame, the rotating frame is rotatably connected in the shell and positioned between two side edges of the U-shaped magnetizer, and an output shaft extending out of the shell is connected to the rotating center of the rotating frame; one end of the elastic torsion piece is connected with the rotating frame, and the other end of the elastic torsion piece is connected with the shell and used for applying simple harmonic swinging elasticity to the rotating frame. The sound wave motor with the external coil and the electric toothbrush have the advantages of convenience and high efficiency in winding, large output torque and capability of enabling the output shaft to form a simple and harmonic reciprocating vibration effect, so that the performance of the electric toothbrush is improved.

Description

Sound wave motor with external coil and electric toothbrush

Technical Field

The utility model belongs to the technical field of electric toothbrushes, and particularly relates to an acoustic wave motor with an external coil and an electric toothbrush.

Background

At present, common electric toothbrush in market uses moving-magnet sound wave motor as the power supply, the sound wave motor is famous because it can make the vibrational frequency of brush head reach the sound wave frequency order of magnitude, the primary structure includes outer stator and inner rotor, wherein, outer stator is fixed with the casing after the coil is gone up to application iron core or insulating line frame, inner rotor assembles the iron core at its rotor shaft, then fixed 4pcs magnet steel or 2pcs magnet steel fill four pairs of poles through the mode of table subsides or inserted sheet, utilize alternating magnetic field drive magnet steel and drive the rotor shaft and carry out reciprocal backswing and realize the vibration after letting in the alternating current in the coil.

Because present moving-magnet sound wave motor all adopts inside wire-wound structural style, and this kind of wire-wound mode is limited by the complex construction of insulating line frame, therefore the wire-wound degree of difficulty is big, inefficiency, and because the coil can occupy a large amount of spaces in the casing, consequently, the external diameter size of rotor is limited, thereby can restrict the moment of torsion promotion of motor, in addition, because need arrange two or even four magnet steel at least, its swing restoring force is the tooth's socket torque between the magnet steel, consequently this kind of structural style is not only complicated, and can't output linear vibration state, these factors all can influence electric toothbrush's performance.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an acoustic wave motor with an external coil and an electric toothbrush, and aims to solve the problems of high difficulty in assembling and winding and low vibration performance of a motor adopted by the conventional electric toothbrush.

In order to realize the purpose, the utility model adopts the technical scheme that: in a first aspect, a sound wave motor with an external coil is provided, which comprises a shell, a stator assembly, a rotor assembly and an elastic torsion piece; the stator component comprises a U-shaped magnetizer and a coil arranged in the middle of the U-shaped magnetizer, wherein two side edges of the U-shaped magnetizer respectively penetrate into the shell along the axial direction of the shell, the penetrating part is embedded on the inner wall of the shell, and the coil is positioned on the outer side of one end of the shell and is used for introducing square wave alternating current to generate an alternating magnetic field and transmitting the alternating magnetic field to two side edges of the U-shaped magnetizer; the rotor assembly comprises a rotating frame and magnetic steel embedded in the center of the rotating frame, wherein the rotating frame is connected in the shell in a rotating mode along the axial direction of the shell and is positioned between two side edges of the U-shaped magnetizer; one end of the elastic torsion piece is connected with the rotating frame, and the other end of the elastic torsion piece is connected with the shell and used for applying simple harmonic swinging elasticity to the rotating frame.

In combination with the first aspect, in a possible implementation manner, the magnetic yokes are respectively embedded on two sides of the rotating frame, the two magnetic yokes are respectively attached to the two magnetic poles of the magnetic steel, and when the rotating frame is located at the swing middle position, the magnetic yokes are perpendicular to the side edges of the U-shaped magnetizer.

In some embodiments, the elastic torsion member includes a torsion spring wire and a connecting block, the torsion spring wire extends along the axial direction of the output shaft, one end of the torsion spring wire is connected with the center of the end wall of the rotating frame close to the coil, the other end of the torsion spring wire is fixedly connected with the connecting block, and the connecting block is embedded on the end wall of the casing close to the coil.

Exemplarily, snap rings are arranged at two ends of the torsion spring wire, and clamping grooves suitable for being embedded into one of the snap rings are arranged at the center positions of the end walls of the rotating frame and the connecting block, which are close to each other.

For example, an insulating wire frame is sleeved on the middle portion of the U-shaped magnetizer, and the coil is wound on the insulating wire frame.

Specifically, the insulating wire frame is formed by buckling two half bodies which are oppositely clamped in the middle of the U-shaped magnetizer.

With reference to the first aspect, in one possible implementation manner, the casing includes a main housing, a first end cover, that is, a second end cover; wherein, both ends of the main shell are open, an axle seat is formed inside the main shell, and the axle seat is rotatably connected with one end of the rotating frame close to the coil; the first end cover is arranged at one end of the main shell body far away from the coil, a through hole suitable for passing through the output shaft is formed in the first end cover, and the through hole is rotatably connected with one end of the rotating frame far away from the coil; the second end cover is arranged at one end of the main shell close to the coil and is connected with the elastic torsion piece, and two through holes which are respectively suitable for the two side edges of the U-shaped magnetizer to pass through are arranged on the second end cover.

In some embodiments, the shaft seat is embedded with a first bearing, the through hole is embedded with a second bearing, one end of the rotating frame, which is close to the coil, is provided with a first shaft extension which is inserted and fixed with an inner ring of the first bearing, and the other end of the rotating frame is provided with a second shaft extension which is inserted and fixed with an inner ring of the second bearing.

Illustratively, the center of the second shaft extension is provided with a jack extending along the axial direction of the second shaft extension, and one end of the output shaft is provided with a connecting part suitable for being inserted and fixed in the jack.

The sound wave motor with the external coil has the beneficial effects that: compared with the prior art, the sound wave motor with the external coil is characterized in that the coil is wound on the middle position of the U-shaped magnetizer outside the shell, when square wave alternating current is introduced into the coil to generate an alternating magnetic field, the alternating magnetic field is conducted to two side edges of the U-shaped magnetizer to enter the shell, so that the magnetic steel is driven to drive the rotating frame to swing back and forth, meanwhile, the elastic torsion piece is utilized to apply simple harmonic swinging elasticity on the rotating frame, the reciprocating swinging of the rotating frame tends to linearity, further, the output shaft obtains a linear reciprocating vibration state, the vibration smoothness of the electric toothbrush is improved, the coil does not occupy the inner space of the shell, and only a single magnetic steel needs to be arranged to be matched with the auxiliary rebounding action of the elastic torsion piece to realize the reciprocating swinging of the rotating frame, so that the winding of the coil and the assembly of the rotor assembly are facilitated, and the size of the shell can be increased without increasing the size of the shell, thereby promoting the torque of the output shaft and further promoting the vibration performance of the electric toothbrush.

In a second aspect, an embodiment of the present invention further provides an electric toothbrush, which includes the acoustic wave motor with external coils, and has the same beneficial effects as the acoustic wave motor with external coils, which are not described herein again.

Drawings

Fig. 1 is a schematic sectional view of an external coil acoustic wave motor according to an embodiment of the present invention;

fig. 2 is a schematic sectional view of an acoustic wave motor with an external coil according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional structure view of an acoustic wave motor with an external coil according to an embodiment of the present invention;

fig. 4 is a first schematic view illustrating a rotor swing state of the acoustic wave motor with external coils according to the embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a rotor swing state of the acoustic wave motor with external coils according to the embodiment of the present invention;

FIG. 6 is a schematic perspective view of a turret according to an embodiment of the present invention;

FIG. 7 is a schematic view of an exploded structure of an insulated wire stand used in an embodiment of the present invention;

fig. 8 is a schematic perspective view of a second end cap according to an embodiment of the utility model.

In the figure: 10. a housing; 11. a main housing; 111. a shaft seat; 12. a first end cap; 121. a through hole; 13. a second end cap; 131. perforating; 20. a stator assembly; 21. a U-shaped magnetizer; 211. an insulating wire frame; 2111. a half body; 22. a coil; 30. a rotor assembly; 31. rotating the frame; 311. a first shaft extension; 312. a second shaft extension; 3121. a jack; 32. magnetic steel; 321. a magnetic yoke; 33. an output shaft; 40. an elastic torsion member; 41. a torsion spring wire; 411. a snap ring; 42. connecting blocks; 421. a card slot; 51. a first bearing; 52. a second bearing.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Referring to fig. 1 to 5, an acoustic wave motor with an external coil 22 according to the present invention will now be described. The acoustic wave motor with the external coil 22 comprises a machine shell 10, a stator assembly 20, a rotor assembly 30 and an elastic torsion member 40; the stator assembly 20 comprises a U-shaped magnetizer 21 and a coil 22 arranged in the middle of the U-shaped magnetizer 21, wherein two side edges of the U-shaped magnetizer 21 respectively penetrate into the casing 10 along the axial direction of the casing 10, and the penetrating part is embedded on the inner wall of the casing 10, and the coil 22 is positioned at the outer side of one end of the casing 10 and is used for introducing square wave alternating current to generate an alternating magnetic field and conducting the alternating magnetic field to two side edges of the U-shaped magnetizer 21; the rotor assembly 30 comprises a rotating frame 31 and magnetic steel 32 embedded in the center of the rotating frame 31, wherein the rotating frame 31 is rotatably connected in the casing 10 along the axial direction of the casing 10 and is positioned between two side edges of the U-shaped magnetizer 21, an output shaft 33 extending out of the casing 10 is connected on the rotating center of the rotating frame 31, and the magnetic steel 32 drives the rotating frame 31 to swing back and forth under the alternating driving force of the alternating magnetic field; one end of the elastic torsion member 40 is connected to the rotating frame 31, and the other end is connected to the casing 10, for applying a simple harmonic swinging elastic force to the rotating frame 31.

The working principle of the acoustic wave motor with the external coil 22 provided by the embodiment is as follows: when the coil 22 is fed with square wave alternating current, firstly, when the current is inputted in the forward direction, as shown in fig. 4, the two sides of the U-shaped magnetizer 21 respectively show N-pole and S-pole, wherein the side of the N-pole of the U-shaped magnetizer 21 is repulsive to the side of the N-pole of the magnetic steel 32 and attractive to the side of the S-pole, and the side of the S-pole of the U-shaped magnetizer 21 is attractive to the side of the N-pole of the magnetic steel 32 and repulsive to the side of the S-pole, so as to drive the rotating frame 31 to swing clockwise, meanwhile, the reverse resilience of the elastic torsion member 40 to the rotating frame 31 is gradually increased during the swing process, when the reverse resilience is equal to the magnetic driving force, the rotating frame 31 swings clockwise to the limit position, then the N-pole and the S-pole on the two sides of the U-shaped magnetizer 21 are reversed due to the current reversal, as shown in fig. 5, the magnetic driving force applied to the magnetic steel 32 is reversed and is superposed with the resilience of the elastic torsion member 40 to drive the rotating frame 31 to swing counterclockwise, and when the revolving rack 31 swings back to the middle position (i.e. the state shown in fig. 3), the elastic torsion member 40 starts to apply a reverse resilience force to the revolving rack 31, and the reverse resilience force increases along with the increase of the counterclockwise swing angle of the revolving rack 31 until the magnetic driving force is balanced again, and then the current reverses again, so that the circulation is repeated, and in the continuous reversing process of the alternating current, the reciprocating swing of the revolving rack 31 is realized, so that the reciprocating swing (vibration) of the output shaft 33 connected to the rotation center of the revolving rack 31 is realized, and because of the effect of the simple harmonic swing resilience force applied to the revolving rack 31 by the elastic torsion member 40, the reciprocating swing process of the revolving rack 31 can be more linear and closer to the simple harmonic motion, so the reciprocating vibration state of the output shaft 33 is more stable.

Compared with the prior art, the acoustic wave motor with the external coil 22 provided in this embodiment, the coil 22 is wound around the U-shaped magnetizer 21 located at the middle position of the outer side of the casing 10, when the square-wave alternating current is applied to the coil 22 to generate the alternating magnetic field, the alternating magnetic field is conducted to the two side edges of the U-shaped magnetizer 21 to enter the casing 10, so as to drive the magnetic steel 32 to drive the turret 31 to perform the reciprocating swing, and meanwhile, the simple harmonic return elastic force exerted on the turret 31 by the elastic torsion member 40 is utilized to make the reciprocating swing of the turret 31 tend to linear, so that the output shaft 33 obtains a linear reciprocating vibration state, thereby improving the vibration smoothness of the electric toothbrush, because the coil 22 does not occupy the inner space of the casing 10, and only a single magnetic steel 32 is arranged to realize the reciprocating swing of the turret 31 in cooperation with the auxiliary return elastic torsion member 40, thereby facilitating the winding of the coil 22 and the assembly of the rotor assembly 30, it is also possible to increase the size of the rotor assembly 30 without increasing the size of the casing 10, thereby increasing the torque of the output shaft 33 and thus improving the vibration performance of the electric toothbrush.

In some embodiments, referring to fig. 2 and fig. 3, the two magnetic yokes 321 are respectively embedded on two sides of the rotating frame 31, the two magnetic yokes 321 respectively attach to the two magnetic poles of the magnetic steel 32, and when the rotating frame 31 is in the swing neutral position, the magnetic yokes 321 are perpendicular to the side edges of the U-shaped magnetizer 21. Two magnetic poles of magnet steel 32 conduct respectively to two yoke 321 on, can make the distribution of two magnetic poles more concentrated to promote to conduct the drive power to magnet steel 32 to the magnetic field on U type magnetizer 21 both sides limit, thereby improve the swing drive power to revolving rack 31, and then promote the output torque of output shaft 33, improve reciprocating vibration performance.

As an embodiment of the elastic torsion member 40, referring to fig. 1 or fig. 2, the elastic torsion member 40 includes a torsion spring wire 41 and a connection block 42, the torsion spring wire 41 extends along an axial direction of the output shaft 33, and one end of the torsion spring wire 41 is connected to a center of an end wall of the rotating frame 31 close to the coil 22, and the other end of the torsion spring wire is fixedly connected to the connection block 42, and the connection block 42 is embedded on an end wall of the casing 10 close to the coil 22. It should be understood that the rotating frame 31 is generally formed by injection molding of a plastic material, one end of the torsion spring wire 41 can be embedded into the end wall of the rotating frame 31 to form an integral structure during the injection molding of the rotating frame 31, then the connecting block 42 is injection molded on the other end of the torsion spring wire 41, and finally the connecting block 42 is fixedly connected with the housing 10, so that the connection manner of the torsion spring wire 41 is simple and reliable, and stable swinging-back elasticity can be provided for the rotating frame 31.

In some embodiments, referring to fig. 1, the two ends of the torsion spring wire 41 are provided with the snap rings 411, and the center positions of the end walls of the rotating frame 31 and the connecting block 42 close to each other are provided with the snap grooves 421 adapted to be inserted into one of the snap rings 411. During the equipment, in the snap ring 411 disect insertion revolving rack 31 end wall of snap ring 411 at one end of torsion spring wire 41, in the snap ring 411 disect insertion connecting block 42 on the snap ring 421 of the other end, can provide elastic torque to revolving rack 31 through torsion spring wire 41 in order to impel revolving rack 31 to swing back, the assembly mode is simple and convenient more, and can carry out the dismouting when torsion spring wire 41 damage became invalid and change, and the practicality is strong.

Referring to fig. 2 and 7, in this embodiment, an insulating bobbin 211 is sleeved on the middle portion of the U-shaped magnetizer 21, and the coil 22 is wound on the insulating bobbin 211; specifically, the insulating bobbin 211 is formed by two half bodies 2111 which are relatively clamped in the middle of the U-shaped magnetizer 21 and buckled with each other. The coil 22 can be prevented from being in direct contact with the U-shaped magnetizer 21 by arranging the insulating wire frame 211, so that the insulating property and the waterproof property are improved, and the structure of the U-shaped magnetizer 21 determines that the insulating wire frame 211 cannot be directly sleeved to the middle part of the U-shaped magnetizer from the end part of the U-shaped magnetizer, so that the structural mode of buckling the two half bodies 2111 is adopted, and the assembly of the wire frame is facilitated.

In some possible implementations, please refer to fig. 1, fig. 2, fig. 6 and fig. 8, the housing 10 includes a main housing 11, a first end cap 12, i.e., a second end cap 13; wherein, both ends of the main housing 11 are open, and a shaft seat 111 is formed inside, the shaft seat 111 is rotatably connected with one end of the rotating frame 31 close to the coil 22; the first end cover 12 is arranged at one end of the main shell 11 far away from the coil 22, a through hole 121 suitable for passing through the output shaft 33 is arranged on the first end cover 12, and the through hole 121 is rotatably connected with one end of the rotating frame 31 far away from the coil 22; the second end cap 13 is disposed at one end of the main housing 11 close to the coil 22 and connected to the elastic torsion member 40, and two through holes 131 are disposed on the second end cap 13 and respectively suitable for two sides of the U-shaped magnetic conductor 21 to pass through. The casing 10 adopts a split structure, and can assemble the rotor assembly 30 inside the main casing 11 by detaching the first end cap 12 and the second end cap 13, and also facilitate the disassembly and assembly maintenance.

It should be understood that, in the present embodiment, the shaft seat 111 is provided with a first bearing 51, the through hole 121 is provided with a second bearing 52, one end of the rotating frame 31 close to the coil 22 is provided with a first shaft extension 311 inserted and fixed with an inner ring of the first bearing 51, and the other end is provided with a second shaft extension 312 inserted and fixed with an inner ring of the second bearing 52. The rotating connection of the rotating frame 31 is realized by the fixed insertion of the shaft extension structure and the bearing inner ring, the smooth rotation and the low resistance of the rotating frame 31 can be ensured, and the output efficiency and the output stability of the reciprocating vibration are improved.

Illustratively, the second shaft extension 312 is provided with a socket 3121 extending along the axial direction thereof at the center thereof, and one end of the output shaft 33 is provided with a connecting portion adapted to be inserted and fixed into the socket 3121. The connection, fixation, disassembly and assembly of the output shaft 33 are facilitated, and in addition, the brush head of the electric toothbrush needs to be connected with the output shaft 33, so the brush head of the electric toothbrush can be assembled conveniently by the output shaft 33 being fixed to the second shaft extension 312 in an inserting mode.

Based on the same inventive concept, please understand with reference to fig. 1 to 8, the embodiment of the present application further provides an electric toothbrush, which includes the above-mentioned coil 22 external acoustic wave motor, because the coil 22 of the motor is wound around the U-shaped magnetizer 21 and located at the middle position outside the casing 10, when the coil 22 is fed with square wave alternating current to generate an alternating magnetic field, the alternating magnetic field is conducted to the two sides of the U-shaped magnetizer 21 to enter the casing 10, so as to drive the magnetic steel 32 to drive the rotating frame 31 to perform reciprocating swing, and meanwhile, the elastic torque member 40 is used to apply a simple and harmonic swinging elastic force on the rotating frame 31, so that the reciprocating swing of the rotating frame 31 tends to be linear, further, the output shaft 33 obtains a linear reciprocating vibration state, and improves the vibration smoothness of the electric toothbrush, because the coil 22 does not occupy the internal space of the casing 10, and only a single magnetic steel 32 needs to be arranged to cooperate with the auxiliary swinging of the elastic torque member 40 to realize the reciprocating swing of the rotating frame 31, therefore, not only the winding of the coil 22 and the assembly of the rotor assembly 30 are facilitated, but also the size of the rotor assembly 30 can be increased without increasing the size of the casing 10, thereby increasing the torque of the output shaft 33 and further improving the vibration performance of the electric toothbrush.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The external sound wave motor of coil, its characterized in that includes:

a housing;

the stator assembly comprises a U-shaped magnetizer and a coil arranged in the middle of the U-shaped magnetizer, wherein two side edges of the U-shaped magnetizer penetrate into the shell along the axial direction of the shell respectively, the penetrating part is embedded on the inner wall of the shell, and the coil is positioned on the outer side of one end of the shell and used for introducing square wave alternating current to generate an alternating magnetic field and conducting the alternating magnetic field to the two side edges of the U-shaped magnetizer;

the rotor assembly comprises a rotating frame and magnetic steel embedded in the center of the rotating frame, wherein the rotating frame is connected in the shell in a rotating mode along the axial direction of the shell and is positioned between two side edges of the U-shaped magnetizer, an output shaft extending out of the shell is connected to the rotating center of the rotating frame, and the magnetic steel drives the rotating frame to swing in a reciprocating mode under the alternating driving force of the alternating magnetic field;

and one end of the elastic torsion piece is connected with the rotating frame, and the other end of the elastic torsion piece is connected with the casing and used for applying simple harmonic swinging elasticity to the rotating frame.

2. The acoustic wave motor with an external coil according to claim 1, wherein a magnetic yoke is fitted on each of both sides of the rotating frame, the two magnetic yokes are respectively attached to the two magnetic poles of the magnetic steel, and the magnetic yoke is perpendicular to the side of the U-shaped magnetic conductor when the rotating frame is in the swing neutral position.

3. The acoustic wave motor with an external coil as claimed in claim 1, wherein the elastic torsion member includes a torsion spring wire and a connection block, the torsion spring wire extends in the axial direction of the output shaft, and one end of the torsion spring wire is connected to the center of the end wall of the rotating frame near the coil, and the other end of the torsion spring wire is fixedly connected to the connection block, and the connection block is embedded in the end wall of the housing near the coil.

4. The acoustic wave motor having a coil external set according to claim 3, wherein both ends of said torsion spring wire are provided with a snap ring, and a snap groove adapted to be fitted into one of said snap rings is provided at a central position of an end wall of said rotating frame and said connecting block which are close to each other.

5. The acoustic wave motor with external coil set forth in claim 1, wherein an insulating bobbin is sleeved on the middle portion of the U-shaped magnetizer, and the coil is wound on the insulating bobbin.

6. The acoustic wave motor with external coil set forth in claim 5, wherein said insulating bobbin is formed by two halves of said insulating bobbin fastened to the middle of said U-shaped magnetic conductor in a facing manner.

7. The coil-out acoustic wave motor according to claim 1, wherein the casing comprises:

the coil comprises a main shell, a coil, a rotating frame and a coil, wherein two ends of the main shell are open, a shaft seat is formed in the main shell, and the shaft seat is rotatably connected with one end of the rotating frame, which is close to the coil;

the first end cover is arranged at one end, far away from the coil, of the main shell, a through hole suitable for the output shaft to pass through is formed in the first end cover, and the through hole is rotatably connected with one end, far away from the coil, of the rotating frame;

the second end cover is arranged at one end, close to the coil, of the main shell and connected with the elastic torsion piece, and two through holes which are suitable for the two side edges of the U-shaped magnetizer to pass through are formed in the second end cover.

8. The acoustic wave motor with an external coil as set forth in claim 7, wherein a first bearing is fitted in the shaft holder, a second bearing is fitted in the through hole, a first shaft extension fitted and fixed to an inner ring of the first bearing is provided at one end of the rotating frame near the coil, and a second shaft extension fitted and fixed to an inner ring of the second bearing is provided at the other end.

9. The acoustic motor of claim 8, wherein the second shaft has a socket extending axially at a center thereof, and the output shaft has a connecting portion at one end thereof adapted to be inserted into the socket.

10. An electric toothbrush comprising a sonic motor with a coil external according to any of claims 1-9.

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