Electric toothbrush

Abstract

The utility model relates to an electric toothbrush which comprises a handle, a toothbrush head, an output shaft, a coil winding and a permanent magnet. The handle comprises a shell and a partition plate located in the shell, the shell and the partition plate are integrally formed, a containing cavity and a rotating cavity are formed in the shell, and the partition plate divides the containing cavity and the rotating cavity. The toothbrush head is located on the outer side of the handle, the output shaft is rotationally installed on the handle, the output shaft is connected with the toothbrush head, and the output shaft further extends into the rotating cavity. And the coil winding is arranged in the accommodating cavity and is connected with a power supply. The permanent magnet is located in the rotating cavity, connected to the output shaft and arranged close to the coil winding. Due to the fact that the output shaft is driven by magnetic force, the output shaft and the coil winding are allowed to be separated from each other, the partition plate is adopted to separate the output shaft and the coil winding, and after external moisture permeates into the handle along the output shaft, the partition plate can prevent the moisture from making contact with the coil winding.

Description

Technical Field

[0001] The utility model relates to the field of toilet articles, in particular to an electric toothbrush. Background Art

[0002] The motor is an important component of an electric toothbrush, which provides power for the electric toothbrush. The motor of the existing electric toothbrush is installed inside the handle of the electric toothbrush, and the output shaft of the motor is connected to the toothbrush head outside the handle. When in use, external moisture easily seeps into the motor along the output shaft, resulting in damage to the motor and affecting the service life of the electric toothbrush. Summary of the Utility Model

[0003] In view of this, the utility model provides an electric toothbrush to solve the problem that the motor in the prior art is easily damaged by water ingress.

[0004] To achieve one or part or all of the above purposes or other purposes, the utility model proposes:

[0005] An electric toothbrush, comprising:

[0006] A handle, which includes a housing and a partition located inside the housing. The housing and the partition are integrally formed. An accommodation cavity and a rotation cavity are provided inside the housing, and the partition separates the accommodation cavity and the rotation cavity;

[0007] A toothbrush head, which is located outside the handle;

[0008] An output shaft, which is rotatably installed on the handle, is connected to the toothbrush head, and also extends into the rotation cavity;

[0009] A coil winding, which is arranged in the accommodation cavity and is connected to a power supply;

[0010] A permanent magnet, which is located in the rotation cavity, is connected to the output shaft, and is arranged close to the coil winding.

[0011] Preferably, the coil winding is composed of a copper coil and an iron core. The copper coil is connected to a power supply. The copper coil includes two winding groups, and the iron core has two symmetrically arranged winding ends. The two winding groups are respectively wound on the two winding ends; when the copper coil is energized, the magnetic fields generated by the two winding groups are opposite;

[0012] The permanent magnet includes two magnetic poles with opposite magnetic polarities, and the two magnetic poles are respectively arranged close to the two winding groups.

[0013] Preferably, the output shaft is connected to the toothbrush head by means of plugging or screwing.

[0014] Preferably, the electric toothbrush further includes a control board, a battery, and a charging coil. The control board, the battery, and the wireless charging coil are all installed in the accommodation cavity, and the wireless charging coil is located on the side of the accommodation cavity away from the rotation cavity;

[0015] The control board is electrically connected to the coil winding;

[0016] The battery is electrically connected to the control board;

[0017] The wireless charging coil is electrically connected to the battery.

[0018] Preferably, the side of the rotation cavity away from the partition is open, and the handle further includes:

[0019] A frame body, which is installed in the rotation cavity, and the permanent magnet is located between the partition and the frame body;

[0020] A bearing, which is installed on the frame body and sleeved on the output shaft, so that the output shaft penetrates through the frame body;

[0021] An end cover, which is installed at the opening of the rotation cavity and connects the end cover to the frame body, and the output shaft also penetrates through the end cover.

[0022] Preferably, a sliding groove is provided on the inner wall of the rotation cavity. The opening direction of the sliding groove is parallel to the axial direction of the output shaft, and the sliding groove extends to the opening. A sliding boss is provided on the frame body, and the sliding boss extends into the sliding groove.

[0023] Preferably, there are two bearings. Both bearings are installed on the frame body and sleeved on the output shaft. The distance between the two bearings is greater than half of the length of the rotation cavity.

[0024] Preferably, the electric toothbrush further includes an elastic member. The elastic member is located in the rotation cavity. The elastic member includes a first connecting portion and a vibrating portion. The first connecting portion is installed on the output shaft, and the vibrating portion extends in a direction perpendicular to the axial direction of the output shaft and is connected to the frame body.

[0025] Preferably, the elastic member further includes a second connecting portion. The first connecting portion and the vibrating portion together form a sheet-like structure. The second connecting portion is stepwise connected to the side of the vibrating portion away from the first connecting portion, and the second connecting portion is connected to the handle.

[0026] Preferably, the elastic member is located at a position between the two bearings.

[0027] Implementing the embodiments of the present utility model will have the following beneficial effects:

[0028] After adopting the above electric toothbrush, since the output shaft is driven by magnetic force, the output shaft and the coil winding are allowed to be separated from each other, and a partition is used to separate the output shaft and the coil winding. After external moisture seeps into the handle along the output shaft, the partition can prevent the moisture from contacting the coil winding. Brief Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic diagram of the overall external shape of an embodiment.

[0031] Figure 2 It is a schematic diagram of the exploded assembly structure of an embodiment;

[0032] Figure 3 It is a schematic diagram of the cross-sectional structure of an embodiment;

[0033] Figure 4 It is a schematic diagram of the partial sectional structure of an embodiment Figure 1 ;

[0034] Figure 5 It is a schematic diagram of the partial sectional structure of an embodiment Figure 2 ;

[0035] Figure 6 It is a schematic diagram of the cross-sectional structure of the housing in an embodiment;

[0036] Figure 7 It is a schematic diagram of the exploded assembly relationship among the end cap, the internal bracket, the output shaft, the permanent magnet and the elastic member in an embodiment;

[0037] Figure 8 It is a schematic diagram of the connection structure among the end cap, the internal bracket, the output shaft, the permanent magnet and the elastic member in an embodiment;

[0038] Figure 9 It is a schematic diagram of the structure of the elastic member in an embodiment;

[0039] Figure 10 It is a schematic diagram of the swinging process of the permanent magnet in an embodiment;

[0040] Figure 11 It is a schematic diagram of the current change in the coil winding in an embodiment;

[0041] Figure 12For another embodiment, it is a schematic diagram of the swinging process of the permanent magnet;

[0042] Figure 13 For another embodiment, it is a schematic diagram of the current change in the coil winding;

[0043] Wherein:

[0044] Handle 1, installation cavity 10, housing 11, partition 12, internal bracket 13, end cover 14, frame body 131, bearing 132, accommodation cavity 101, rotation cavity 102, opening 1021, sliding groove 1022, sliding boss 1301, clamping portion 1311, third connecting portion 1312;

[0045] Toothbrush head 2;

[0046] Output shaft 3, installation groove 31;

[0047] Coil winding 4, copper coil 41, iron core 42, winding group 411, winding end 421;

[0048] Permanent magnet 5, magnetic pole end 51;

[0049] Control board 6;

[0050] Battery 7;

[0051] Charging coil 8;

[0052] Elastic member 9, first connecting portion 91, vibrating portion 92, second connecting portion 93, stepped connecting structure 94;

[0053] First locking screw 1001;

[0054] Second locking screw 1002. Detailed implementation manners

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs; the terms used in the description of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit this utility model; the terms "including" and "having" and any variations thereof in the description and claims of this utility model and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this utility model or the above drawings are used to distinguish different objects and are not used to describe a specific order.

[0056] References herein to "embodiments" mean that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0057] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0058] Referring to the attached Figures 1 to 13 , the present invention provides a magnetically coupled reciprocating rotary motor, which includes a handle 1, an output shaft 3, a coil winding 4, a permanent magnet 5, and an elastic member 9.

[0059] Among them, the handle 1 includes a housing 11 and a partition 12. An installation cavity 10 is provided inside the housing 11. The partition 12 is disposed in the installation cavity 10, and the partition 12 divides the installation cavity 10 into a receiving cavity 101 and a rotating cavity 102. An opening 1021 is provided on the side of the rotating cavity 102 away from the partition 12. The toothbrush head 2 is located outside the handle 1. The toothbrush head 2 is made of plastic. The shape of the end of the housing 11 is designed according to needs, such as Figure 3 and Figure 4 the two shapes shown in

[0060] . The output shaft 3 is rotatably installed on the handle 1. The output shaft 3 is connected to the toothbrush head 2 by interference plugging or threaded connection, and the output shaft 3 can also extend into the rotating cavity 102 from the opening 1021. The coil winding 4 is composed of a copper coil 41 and an iron core 42. The copper coil 41 is arranged to be powered on. The copper coil 41 includes two connected winding groups 411. The iron core 42 has two symmetrically arranged winding ends 421. The two winding groups 411 are respectively wound around the two winding ends 421. When the copper coil 41 is powered on, the magnetic fields generated by the two winding groups 411 are opposite.

[0061] When a positive current is passed through the copper coil 41, the magnetism generated by each winding group 411 is respectively opposite to the magnetism of the corresponding magnetic pole end 51, causing the magnetic pole end 51 to be repelled and move away from the winding group 411; conversely, when a reverse current is passed through the copper coil 41, the magnetism generated by each winding group 411 is respectively the same as the magnetism of the corresponding magnetic pole end 51, causing the magnetic pole end 51 to be attracted and move closer to the winding group 411. This principle is used to drive the output shaft 3 to rotate. The output shaft 3 does not need to contact the coil winding 4. Therefore, a partition 12 is used to separate the output shaft 3 and the coil winding 4. When external moisture seeps into the handle 1 along the output shaft 3, the partition 12 can prevent the moisture from contacting the coil winding 4, that is, prevent the energized coil winding 4 from being damaged by water. In addition, the entire outer shell 11 and the partition 12 are integrally formed. The outer shell 11 does not need to be disassembled into two parts for installation. There are no installation gaps on the outer side wall of the outer shell 11, and external moisture cannot bypass the partition 12 and invade the accommodation cavity 101 through the installation gaps, reducing the possibility of external moisture invading the accommodation cavity 101.

[0062] Further, the electric toothbrush further includes a control board 6, a battery 7, and a charging coil 8. The control board 6, the battery 7, and the wireless charging coil 8 are all placed in the accommodation cavity 101, and the wireless charging coil 8 is located on the side of the accommodation cavity 101 away from the rotation cavity 102. The control board 6 is electrically connected to the coil winding 4, and the control board 6 is used to control the electrical signal input to the coil winding 4. The battery 7 is electrically connected to the control board 6, and the battery 7 is used to supply power to the control board 6 and the coil winding 4. The wireless charging coil 8 is electrically connected to the battery 7. The wireless charging coil 8 can be used in cooperation with a wireless charger to generate current according to the principle of electromagnetic induction and charge the battery 7.

[0063] Further, to save the energy consumption of the coil winding 4, refer to the appendix Figure 4 、 5, 7, 8, and 9. In this embodiment, the electric toothbrush further includes an elastic member 9. The elastic member 9 is located in the rotation cavity 102. The elastic member 9 includes an integrally formed first connection portion 91 and a vibration portion 92. The first connection portion 91 is fixedly installed on the output shaft 3. The vibration portion 92 extends in a direction perpendicular to the axial direction of the output shaft 3, and one end of the vibration portion 92 away from the first connection portion 91 is connected to the handle 1. The forward rotation of the output shaft 3 correspondingly causes the elastic member 9 to generate a forward elastic deformation. If the current input to the copper coil 41 is stopped at this time, the elastic member 9 releases its elastic potential energy, causing the elastic member 9 to move rapidly in the reverse direction and generate a reverse elastic deformation with a weakened amplitude. Then, the reverse elastic deformation releases its elastic potential energy again, causing the elastic member 9 to generate a forward elastic deformation with a further weakened amplitude until the elastic potential energy of the elastic member 9 is completely consumed and it returns to its initial position. During this process, the elastic member 9 undergoes a reciprocating vibration. The motor can utilize the reciprocating vibration process of the elastic member 9 to provide additional power for the reciprocating movement of the output shaft 3, and the work done by the current input to the copper coil 41 only needs to ensure that the amplitude of each vibration of the elastic member 9 is the same or nearly the same. The work done by the current will be greatly reduced, achieving the purpose of energy conservation. In addition, the main deformation part of the elastic member 9 is concentrated at the vibration portion 92. The vibration portion 92 is linearly extended to shorten the length of the vibration portion 92 and reduce the vibration duration of each vibration of the vibration portion 92.

[0064] The permanent magnet 5 takes the position where the central connection line of its two magnetic poles 51 is parallel to the central connection line of the two winding groups 411 as the initial position.

[0065] Specifically, referring to the appendix Figure 10 , when a positive current is passed through the copper coil 41, the magnetism generated by each winding group 411 is opposite to the magnetism of the corresponding magnetic pole 51, causing the magnetic pole 51 to be repelled and swing forward away from the winding group 411, thereby driving the output shaft 3 to rotate forward. At the same time, the elastic member 9 is driven to generate an elastic deformation and store elastic potential energy. When the repulsive torque generated by the winding group 411 on the magnetic pole 51 is equal to the elastic torque of the elastic member 9 on the output shaft 3, the angular acceleration of the forward rotation of the output shaft 3 is zero. Then, a reverse current is passed through the copper coil 41. The magnetism generated by each winding group 411 is the same as the magnetism of the corresponding magnetic pole 51, causing the magnetic pole 51 to be attracted by the winding group 411. The magnetic pole 51 will swing backward close to the winding group 411, thereby driving the output shaft 3 to rotate backward. During this process, the elastic member 9 releases its elastic potential energy and is used to assist the output shaft 3 in rotating backward. Correspondingly, it can also assist in pushing the magnetic pole 51 to swing backward and drive the permanent magnet 5 to return to its initial position.

[0066] After the permanent magnet 5 returns to the initial position, a forward current is passed through the copper coil 41 again, and the winding group 411 generates a repulsive force on the magnetic pole end 51 again. Under the combined influence of the repulsive force and the moving inertia, the magnetic pole end 51 crosses the initial position, causing the output shaft 3 to continue to rotate in the reverse direction. At the same time, the elastic member 9 is driven to generate an elastic deformation in the opposite direction. Until the repulsive force moment generated by the winding group 411 on the magnetic pole end 51 is equal to the elastic force moment generated by the elastic member 9, the angular acceleration of the output shaft 3 rotating in the reverse direction is zero. Then, a reverse current is passed through the copper coil 41 again, the winding group 411 generates an attractive force on the magnetic pole end 51 again, the corresponding elastic member 9 starts to release elastic potential energy, and the magnetic pole end 51 is driven to rotate forward under the action of the attractive force and the elastic force of the elastic member 9, that is, the output shaft 3 rotates forward again. Until the permanent magnet 5 returns to the initial position, a motion cycle is completed. According to the above motion principle, by continuously passing forward current and reverse current, the output shaft 3 can be made to rotate reciprocally.

[0067] In this embodiment, the changes of the forward current and the reverse current are as shown in the appendix Figure 11 shown, where T is the current passing time and I is the current intensity.

[0068] It should be noted that the forward and reverse rotations of the output shaft 3 only represent two different rotation directions, and the forward current and the reverse current also only represent two different current input directions.

[0069] In this magnetic coupling type reciprocating rotation motor, since the vibration part 92 is set with a short length and a short vibration time, it is more convenient to adjust the reciprocating frequency of the output shaft 3 and reduce the influence of the aftershock of the vibration part 92 on the rotation of the output shaft 3. Moreover, by adjusting the time of passing the forward current and the reverse current, when the reciprocating motion frequency of the output shaft 3 is close to or the same as the vibration frequency of the vibration part 92, the work done ratio of the elastic member 9 during the reciprocating rotation of the output shaft 3 can be increased, and the current magnitude required for the coil winding 4 can be greatly reduced, thereby greatly reducing the power consumption of this magnetic coupling type reciprocating rotation motor.

[0070] Among them, by changing the magnitude of the current passed through the coil sleeve group, the magnitude of the magnetic force generated by the winding group 411 can be changed. When the current working time is unchanged, the maximum rotation angle of the output shaft 3 can be adjusted; and by adjusting the change frequency of the current direction in the coil sleeve group, that is, adjusting the current working time in each direction, the reciprocating motion frequency of the output shaft 3 can be affected. Then, according to different usage scenarios, elastic members 9 with different strengths can be designed correspondingly, so that the elastic force provided by the elastic member 9 meets the usage requirements. For example, the strength of the elastic member 9 can be adjusted by changing factors such as the thickness, width, and length of the elastic member 9.

[0071] Further, to facilitate the manufacturer to adjust the strength of the elastic member 9 according to the rotating motor of different sizes, in this embodiment, it is achieved by adjusting the length of the vibrating portion 92. Referring to FIGS. 8 and 9, specifically, the elastic member 9 further includes a second connecting portion 93. The first connecting portion 91 and the vibrating portion 92 together form a sheet-like structure. The second connecting portion 93 is connected to the vibrating portion 92 in a stepped manner on the side away from the first connecting portion 91, and the second connecting portion 93 is connected to the handle 1. Among them, the first connecting portion 91, the vibrating portion 92, and the second connecting portion 93 are integrally formed. A bend is made between the vibrating portion 92 and the second connecting portion 93 to form a stepped connecting structure 94. The stepped connecting structure 94 has a certain effect of eliminating the transmission of vibration, which can reduce the vibration transmitted from the vibrating portion 92 to the second connecting portion 93, so that the main deformation part of the elastic member 9 is still concentrated on the vibrating portion 92 rather than on the second connecting portion 93. The prerequisite for this setting is that the length of the vibrating portion 92 needs to be greater than the length of the second connecting portion 93. The manufacturer can adjust the position of the stepped connecting structure 94 to correspondingly adjust the length of the vibrating portion 92, and adjust the maximum elastic force that the vibrating portion 92 can provide in this way.

[0072] Further, an installation groove 31 is formed on the output shaft 3. The first connecting portion 91 passes through the installation groove 31, so that the connection between the first connecting portion 91 and the output shaft 3 coincides with the axis of the output shaft 3, so that the fulcrum of the elastic force generated by the vibrating portion 92 on the output shaft 3 is on the axis of the output shaft 3, reducing the radial shear force received by the output shaft 3. The elastic member 9 has two vibrating portions 92 and two second connecting portions 93. The two vibrating portions 92 and the two second connecting portions 93 are symmetrically arranged about the axis of the output shaft 3, improving the magnitude of the elastic force that the entire elastic member 9 can provide.

[0073] Further, referring to the appendix Figures 4 to 8 , the handle 1 further includes an internal support 13 and an end cap 14.

[0074] Among them, the internal bracket 13 is installed in the rotation cavity 102, the vibration part 92 is connected to the internal bracket 13, and the permanent magnet 5 is located between the partition plate 12 and the internal bracket 13. The end cover 14 is installed at the opening 1021 of the rotation cavity 102, and the internal bracket 13 is pressed against the end cover 14. The output shaft 3 is connected to the permanent magnet 5 after sequentially penetrating the end cover 14 and the internal bracket 13. A sliding groove 1022 is provided on the inner wall of the rotation cavity 102. The opening direction of the sliding groove 1022 is parallel to the axial direction of the output shaft 3. The sliding groove 1022 extends to communicate with the opening 1021. A sliding boss 1301 is provided on the internal bracket 13. The sliding boss 1301 extends into the sliding groove 1022, and the sliding boss 1301 abuts against the end face of the sliding groove 1022 on the side close to the partition plate 12. Among them, the sliding boss 1301 and the sliding groove 1022 are mainly used to prevent the internal bracket 13 from rotating together with the output shaft 3.

[0075] In this embodiment, the provided internal bracket 13 facilitates the installation of the elastic piece and the permanent magnet 5 more conveniently. The specific installation steps are as follows:

[0076] Step 1: Pass the output shaft 3 through the internal bracket 13;

[0077] Step 2: Connect the elastic member 9 to the output shaft 3 and the internal bracket 13;

[0078] Step 3: Install the permanent magnet 5 on the output shaft 3;

[0079] Step 4: Move the internal bracket 13 to the opening 1021, and drive the sliding boss 1301 to correspond to the position of the sliding groove 1022, and push the internal bracket 13 into the rotation cavity 102 along the sliding groove 1022;

[0080] Step 5: Install the end cover 14 at the opening 1021, and press the end cover 14 tightly on the internal bracket 13.

[0081] Furthermore, in order to reduce the rotational friction loss of the output shaft 3, in this embodiment, the internal bracket 13 is divided into a frame body 131 and a bearing 132. The second connecting portion 93 is fixedly connected to the frame body 131 by means of pressing, screwing, etc. The bearing 132 is installed on the frame body 131, and the bearing 132 is sleeved on the output shaft 3. The friction between the output shaft 3 and the handle 1 is reduced through the bearing 132.

[0082] Specifically, the frame body 131 includes two clamping portions 1311 and a third connecting portion 1312 connecting the two clamping portions 1311. The sliding boss 1301 is provided on the third connecting portion 1312. There are two bearings 132, as shown in the appendix Figure 7 and 8As shown, two bearings 132 are respectively embedded in two clamping portions 1311, the second connecting portion 93 is connected to the third connecting portion 1312, and at the same time, the elastic member 9 is located between the two clamping portions 1311. The setting of the two bearings 132 is mainly to improve the supporting ability of the output shaft 3, avoid radial vibration and offset of the output shaft 3, and thus improve the stability and service life of the rotating motor.

[0083] In addition, the magnetic coupling reciprocating rotating motor further includes a first locking screw 1001 and a second locking screw 1002. The permanent magnet 5 is fixed on the output shaft 3 by the first locking screw 1001, and the first connecting portion 91 is fixed on the output shaft 3 by the second locking screw 1002. In other embodiments, they can also be connected in forms such as pins and welding.

[0084] In other embodiments, the copper coil 41 can also be supplied with only a single-phase current, and the change of the single-phase current is as shown in the appendix Figure 13 where t is the current input time and i is the current intensity. Refer to the appendix Figure 12 , and the specific working process is as follows:

[0085] After a single-phase current is supplied to the copper coil 41, the magnetism generated by each winding group 411 is opposite to the magnetism of the corresponding magnetic pole end 51, so that the magnetic pole end 51 is repelled and swings forward away from the winding group 411, thereby driving the output shaft 3 to rotate forward. At the same time, the elastic member 9 is driven to generate elastic deformation and store elastic potential energy. When the repulsive torque generated by the winding group 411 on the magnetic pole end 51 is equal to the elastic torque of the elastic member 9 on the output shaft 3, the angular acceleration of the output shaft 3 rotating forward is zero. Then, the input of the single-phase current is stopped, and the elastic member 9 releases the elastic potential energy and drives the output shaft 3 to rotate reversely. Correspondingly, the magnetic pole end 51 will swing reversely close to the winding group 411, driving the permanent magnet 5 to return to the initial position.

[0086] After the permanent magnet 5 returns to the initial position, the copper coil 41 is supplied with the single-phase current again, and the winding group 411 generates a repulsive force on the magnetic pole end 51 again. Under the combined influence of the repulsive force and the movement inertia, the magnetic pole end 51 crosses the initial position, causing the output shaft 3 to continue to rotate reversely. At the same time, the elastic member 9 is driven to generate elastic deformation in the opposite direction. Until the repulsive torque generated by the winding group 411 on the magnetic pole end 51 is equal to the elastic torque generated by the elastic member 9, the angular acceleration of the output shaft 3 rotating reversely is zero. The input of the single-phase current is stopped again, and the elastic member 9 begins to release the elastic potential energy. The output shaft 3 is driven to rotate forward under the elastic force of the elastic member 9, that is, the magnetic pole end 51 rotates forward again until the permanent magnet 5 returns to the initial position, completing a motion cycle.

[0087] Compared with the previous embodiment, this other embodiment is characterized in that it does not require changing the direction of the current, the overall working duration of the current is reduced, and the power consumption is reduced. However, the requirements for the elastic member 9 used in this other embodiment are increased.

[0088] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all of the embodiments. The preferred embodiments of the present invention are given in the drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing specific embodiments, or perform equivalent replacements for some of the technical features. Any equivalent structure made by using the specification and drawings of the present invention, directly or indirectly applied in other related technical fields, is similarly within the scope of the patent protection of the present invention.

Claims

1. An electric toothbrush, characterized in that, Comprising: A handle, the handle includes a housing and a partition located inside the housing, the housing and the partition are integrally formed, a receiving cavity and a rotating cavity are provided inside the housing, and the partition separates the receiving cavity and the rotating cavity; A toothbrush head, the toothbrush head is located outside the handle; An output shaft, the output shaft is rotatably installed on the handle, the output shaft is connected to the toothbrush head, and the output shaft also extends into the rotating cavity; A coil winding, the coil winding is arranged in the receiving cavity, and the coil winding is connected to a power supply; A permanent magnet, the permanent magnet is located in the rotating cavity, and the permanent magnet is connected to the output shaft, and the permanent magnet is arranged close to the coil winding.

2. The electric toothbrush according to claim 1, wherein The coil winding is composed of a copper coil and an iron core, the copper coil is connected to a power supply, the copper coil includes two winding groups, the iron core has two symmetrically arranged winding ends, and the two winding groups are respectively wound on the two winding ends; when the copper coil is energized, the magnetic fields generated by the two winding groups are opposite; The permanent magnet includes two magnetic poles with opposite polarities, and the two magnetic poles are respectively arranged close to the two winding groups.

3. An electric toothbrush according to claim 1, characterized in that, The output shaft is connected to the toothbrush head by means of plugging or screwing.

4. An electric toothbrush according to claim 1, characterized in that, It further includes a control board, a battery and a charging coil, the control board, the battery and the wireless charging coil are all installed in the receiving cavity, and the wireless charging coil is located on the side of the receiving cavity away from the rotating cavity; The control board is electrically connected to the coil winding; The battery is electrically connected to the control board; The wireless charging coil is electrically connected to the battery.

5. An electric toothbrush according to claim 1, wherein The side of the rotating cavity away from the partition is open, and the handle further includes: A frame body, the frame body is installed in the rotating cavity, and the permanent magnet is located between the partition and the frame body; A bearing, the bearing is installed on the frame body, and the bearing is sleeved on the output shaft, so that the output shaft penetrates through the frame body; An end cap, the end cap is installed at the opening of the rotating cavity, and the end cap is connected to the frame body, and the output shaft also penetrates through the end cap.

6. An electric toothbrush according to claim 5, wherein, A sliding groove is provided on the inner wall of the rotating cavity, the opening direction of the sliding groove is parallel to the axial direction of the output shaft, the sliding groove extends and communicates with the opening, a sliding boss is provided on the frame body, and the sliding boss extends into the sliding groove.

7. An electric toothbrush according to claim 5, characterized in that, There are two bearings, both of the two bearings are installed on the frame body, and both of the two bearings are sleeved on the output shaft, and the distance between the two bearings is greater than half of the length of the rotating cavity.

8. An electric toothbrush according to claim 7, characterized in that, It further includes an elastic member, the elastic member is located in the rotating cavity, the elastic member includes a first connecting portion and a vibrating portion, the first connecting portion is installed on the output shaft, the vibrating portion extends in a direction perpendicular to the axial direction of the output shaft, and the vibrating portion is connected to the frame body.

9. An electric toothbrush according to claim 8, wherein, The elastic member further includes a second connecting portion, the first connecting portion and the vibrating portion jointly form a sheet-like structure, the second connecting portion is connected to the vibrating portion on the side away from the first connecting portion in a stepped manner, and the second connecting portion is connected to the handle.

10. An electric toothbrush according to claim 8, characterized in that, The elastic member is located at a position between the two bearings.

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