A vibrating motor for an electric toothbrush

Abstract

This invention relates to the field of motor technology, specifically to a vibrating motor for an electric toothbrush, comprising a housing; the housing has a first stator, a second stator, and a rotating shaft; the rotating shaft is connected to a magnet assembly; a coil assembly is wound between the first stator and the second stator; the second stator has a magnetically conductive part; a limiting ring is fixedly provided at the bottom of the rotating shaft; a locking cavity is provided at one end of the limiting ring; a locking block is slidably provided in the locking cavity; the limiting ring has a telescopic hole; the locking block has a locking pin; the locking block has a permanent magnet; a return spring is provided between the locking block and the locking cavity; and the magnetically conductive part has a locking groove. By configuring the second stator, the magnetically conductive part, the locking block, and the return spring, this invention ensures that when the motor is powered off, under the action of the return spring, the locking pin of the locking block extends out of the telescopic hole and inserts into the locking groove of the magnetically conductive part, making the rotating shaft, the second stator, and the housing a rigid whole, thus preventing the rotating shaft from shaking when used as a regular toothbrush.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and specifically to a sweeping motor for an electric toothbrush. Background Technology

[0002] In the current oral care field, electric toothbrushes, with their highly efficient cleaning capabilities, are gradually replacing traditional manual toothbrushes as the mainstream product. To further improve cleaning effectiveness, the industry is constantly exploring the integration of multiple functions into the drive motor of electric toothbrushes. Among them, motors with sweeping and vibration functions have become a research hotspot because they can more thoroughly remove food debris and plaque from between teeth through a combination of sweeping and vibration.

[0003] Chinese utility model patent application number CN202421554921.8 discloses a motor with a sweeping and vibration function. This motor aims to achieve a combined sweeping and vibration motion through structural design to adapt to products such as electric toothbrushes that require multi-dimensional cleaning actions. However, because the motor's shaft and stator are connected by a rotating structure, although this connection provides a certain basis for the motor to achieve the sweeping and vibration function, in the scenario where an electric toothbrush is used as a regular toothbrush, the rotating connection between the shaft and stator will disrupt the overall structural stability of the toothbrush.

[0004] Because the shaft can rotate freely relative to the stator, when a user holds a toothbrush equipped with this motor and performs a regular brushing operation, the toothbrush head will constantly shake due to the irregular rotation of the shaft, thus failing to effectively clean the target tooth area, and may even cause unnecessary friction and damage to the gums due to the large amplitude of the brush head shaking. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing a sweeping motor for an electric toothbrush.

[0006] The objective of this invention is achieved through the following technical solution: a vibrating motor for an electric toothbrush, comprising a housing; a first stator and a second stator fixedly disposed within the housing; a rotating shaft rotatably disposed within the housing; a magnet assembly connected to the rotating shaft; the magnet assembly rotatably disposed within the first stator; and a coil assembly wound between the first stator and the second stator.

[0007] The second stator has a magnetic conductive part at the bottom of the first stator; a limiting ring is fixedly provided at the bottom of the rotating shaft; a locking cavity is provided at one end of the limiting ring; a locking block is slidably provided in the locking cavity; the limiting ring has a telescopic hole communicating with the locking cavity; the locking block has a locking pin; the locking pin is telescopically movably located in the telescopic hole; a permanent magnet is provided at the end of the locking block near the telescopic hole; a return spring is provided between the end of the locking block away from the telescopic hole and the locking cavity; the magnetic conductive part has a locking groove that cooperates with the locking pin.

[0008] The present invention is further configured such that: one end of the first stator is provided with a first magnetic arm; the other end of the first stator is provided with a second magnetic arm; one side of the first magnetic arm is provided with a first left magnetic tooth, and the other side of the first magnetic arm is provided with a first right magnetic tooth; one side of the second magnetic arm is provided with a second left magnetic tooth, and the other side of the second magnetic arm is provided with a second right magnetic tooth; the rotating shaft is disposed between the first left magnetic tooth, the first right magnetic tooth, the second left magnetic tooth, and the second right magnetic tooth.

[0009] The magnet assembly includes a first magnet, a second magnet, a third magnet, and a fourth magnet wound around the outer periphery of the rotating shaft; the first magnet, the second magnet, the third magnet, and the fourth magnet all extend along the length direction of the rotating shaft;

[0010] The first magnet, the second magnet, the third magnet, and the fourth magnet are respectively configured to correspond to the first left magnetic tooth, the first right magnetic tooth, the second left magnetic tooth, and the second right magnetic tooth.

[0011] The present invention is further configured such that the second stator includes a strip winding portion; the strip winding portion is disposed at the bottom of the first magnetic arm; the coil assembly includes a first coil wound between the strip winding portion and the first magnetic arm and a second coil wound on the second magnetic arm.

[0012] The present invention is further configured such that a first connecting arm is provided on one side of the strip winding portion; and a second connecting arm is provided on the other side of the strip winding portion.

[0013] The present invention is further configured such that a cooling plate is provided inside the housing; the outer wall of the cooling plate abuts against the housing and the first stator respectively; and the inner wall of the cooling plate abuts against the second coil.

[0014] The present invention is further configured such that a mounting base is provided inside the housing; the limiting ring is rotatably disposed on the top of the mounting base.

[0015] The invention is further configured such that the other end of the limiting ring is provided with a sealing cavity; a piston is slidably disposed within the sealing cavity; a connecting rod is provided between the piston and the locking block; the connecting rod passes through the rotating shaft.

[0016] The sealed cavity is provided with an air inlet and an air outlet at the end away from the rotating shaft; the cross-sectional area of ​​the air outlet is larger than that of the air inlet; the air outlet is provided with a one-way valve that opens outward from the sealed cavity.

[0017] The present invention is further configured such that the mounting base is provided with an air intake passage communicating with an air inlet; the mounting base is provided with an exhaust passage communicating with an exhaust outlet;

[0018] The cooling plate is provided with a cooling air passage; the two ends of the cooling air passage are respectively connected to the air intake passage and the air exhaust passage.

[0019] The present invention is further configured such that the cooling air passage surrounds the cooling fins.

[0020] The present invention is further configured such that a counterweight is provided at the end of the piston away from the exhaust port.

[0021] The beneficial effects of the present invention are as follows: By setting a second stator, a magnetic guide part, a locking block and a return spring, the present invention enables the locking pin of the locking block to extend out of the telescopic hole and insert into the locking groove of the magnetic guide part under the action of the return spring when the motor is powered off, so that the rotating shaft, the second stator and the housing are a rigid whole, so that the rotating shaft will not wobble when used as a regular toothbrush. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a cross-sectional view of the present invention;

[0024] Figure 3 yes Figure 2 A magnified view of part A in the middle;

[0025] Figure 4 This is a schematic diagram of the structure of the present invention after the shell is hidden;

[0026] Figure 5 This is a cross-sectional view of the present invention after the housing is concealed;

[0027] Figure 6 This is an exploded view of the structure of the present invention;

[0028] Figure 7 This is an exploded view of the structure from another perspective of the present invention;

[0029] Figure 8 This is a perspective view of the cooling plate of the present invention;

[0030] Wherein: 1. Housing; 2. First stator; 21. First magnetic arm; 22. Second magnetic arm; 23. First left magnetic tooth; 24. First right magnetic tooth; 25. Second left magnetic tooth; 26. Second right magnetic tooth; 3. Second stator; 31. Magnetic conductive part; 32. Locking groove; 33. Strip winding part; 34. First connecting arm; 35. Second connecting arm; 4. Rotating shaft; 41. First magnet; 42. Second magnet; 43. Third magnet ; 44. Fourth magnet; 5. Limiting ring; 51. Locking cavity; 52. Locking block; 53. Telescopic hole; 54. Locking pin; 55. Permanent magnet; 56. Return spring; 61. Sealing cavity; 62. Piston; 63. Connecting rod; 64. Air inlet; 65. Exhaust port; 66. One-way valve; 67. Counterweight; 71. First coil; 72. Second coil; 8. Cooling plate; 81. Cooling air passage; 9. Mounting base; 91. Air inlet. Detailed Implementation

[0031] The present invention will be further described in conjunction with the following embodiments.

[0032] Depend on Figures 1 to 8 As can be seen, the electric toothbrush vibration motor described in this embodiment includes a housing 1; a first stator 2 and a second stator 3 are fixedly disposed inside the housing 1; a rotating shaft 4 is rotatably disposed on the housing 1; a magnet assembly is connected to the rotating shaft 4; the magnet assembly is rotatably disposed inside the first stator 2; a coil assembly is wound between the first stator 2 and the second stator 3;

[0033] The second stator 3 is provided with a magnetic conductive part 31 at the bottom of the first stator 2; a limiting ring 5 is fixedly provided at the bottom of the rotating shaft 4; a locking cavity 51 is provided at one end of the limiting ring 5; a locking block 52 is slidably provided in the locking cavity 51; the limiting ring 5 is provided with a telescopic hole 53 communicating with the locking cavity 51; the locking block 52 is provided with a locking pin 54; the locking pin 54 is telescopically movably provided in the telescopic hole 53; a permanent magnet 55 is provided at one end of the locking block 52 near the telescopic hole 53; a return spring 56 is provided between the end of the locking block 52 away from the telescopic hole 53 and the locking cavity 51; the magnetic conductive part 31 is provided with a locking groove 32 that cooperates with the locking pin 54.

[0034] Specifically, the electric toothbrush sweeping motor described in this embodiment only needs to be de-energized when it is used as a regular toothbrush. At this time, the second stator 3 and the magnetic part 31 are not magnetic. Under the action of the return spring 56, the locking block 52 moves towards the magnetic part 31, so that the locking pin 54 extends out of the telescopic hole 53 and is inserted into the locking groove 32 of the magnetic part 31. At this time, the rotating shaft 4, the second stator 3 and the housing 1 are a rigid whole, so that the rotating shaft 4 will not shake when used as a regular toothbrush.

[0035] When it is needed to be used as an electric toothbrush, simply power on the coil assembly. The magnetic conductor 31 generates magnetic poles with the same magnetism as the permanent magnet 55, thereby driving the permanent magnet 55 and the locking block 52 to move away from the magnetic conductor 31. As a result, the locking pin 54 separates from the locking groove 32 and retracts into the locking cavity 51. At the same time, the first stator 2 generates a magnetic field. Under the action of the first stator 2 and the magnet assembly, the rotating shaft 4 is driven to perform sweeping vibration, thus enabling it to be used as an electric toothbrush.

[0036] In addition, when the acoustic sweeping motor of this embodiment reaches its maximum angle (the sweeping angle can be between 1 and 180 degrees), a follow-through time of 0.01-2 seconds is provided during the commutation sweeping, preferably 0.02-0.2 seconds. This can buffer the noise problems caused by commutation vibration, mechanical friction of bearings, electromagnetic vibration, etc. In addition, due to the characteristics of acoustic sweeping, the PWM frequency of the control system avoids multiples of 2 (such as 10KHz, 12KHz, 14KHz, 16KHz or 20KHz, etc.) and multiples of 3 (such as 12KHz, 15KHz, 18KHz or 21KHz, etc.), and preferably uses 17KHz, 19KHz and 23KHz.

[0037] This embodiment describes a sweeping motor for an electric toothbrush. One end of the first stator 2 is provided with a first magnetic arm 21; the other end of the first stator 2 is provided with a second magnetic arm 22; one side of the first magnetic arm 21 is provided with a first left magnetic tooth 23, and the other side of the first magnetic arm 21 is provided with a first right magnetic tooth 24; one side of the second magnetic arm 22 is provided with a second left magnetic tooth 25, and the other side of the second magnetic arm 22 is provided with a second right magnetic tooth 26; the rotating shaft 4 is located between the first left magnetic tooth 23, the first right magnetic tooth 24, and the first right magnetic tooth 25. Between the two left magnetic teeth 25 and the second right magnetic teeth 26; the magnet assembly includes a first magnet 41, a second magnet 42, a third magnet 43 and a fourth magnet 44 wound around the outer periphery of the rotating shaft 4; the first magnet 41, the second magnet 42, the third magnet 43 and the fourth magnet 44 all extend along the length direction of the rotating shaft 4; the first magnet 41, the second magnet 42, the third magnet 43 and the fourth magnet 44 are respectively corresponding to the first left magnetic tooth 23, the first right magnetic tooth 24, the second left magnetic tooth 25 and the second right magnetic tooth 26.

[0038] Specifically, in this embodiment, the electric toothbrush sweeping motor, after the coil assembly is energized and the locking pin 54 separates from the locking groove 32, continuously changes the magnetism at both ends of the first magnetic arm 21 and the second magnetic arm 22 by passing an alternating current through the coil. In addition, through the cooperation of the first magnet 41, the second magnet 42, the third magnet 43, the fourth magnet 44, the first left magnetic tooth 23, the first right magnetic tooth 24, the second left magnetic tooth 25, and the second right magnetic tooth 26, the rotating shaft 4 can continuously perform small-amplitude reciprocating vibrations while performing large-angle reciprocating oscillations, thereby simulating the sweeping vibration action when a human hand brushes teeth.

[0039] The electric toothbrush sweeping motor described in this embodiment includes a second stator 3 comprising a strip winding portion 33; the strip winding portion 33 is disposed at the bottom of the first magnetic arm 21; the coil assembly includes a first coil 71 wound between the strip winding portion 33 and the first magnetic arm 21 and a second coil 72 wound on the second magnetic arm 22.

[0040] Specifically, through the above-mentioned setup, after the first coil 71 is energized, a magnetic field is generated at both ends of the strip winding portion 33, thereby magnetizing one end of the strip winding portion 33 and generating a mutual reaction with the permanent magnet 55.

[0041] The electric toothbrush vibration motor described in this embodiment has a first connecting arm 34 on one side of the strip winding portion 33 and a second connecting arm 35 on the other side. This arrangement ensures a stable and reliable connection between the first stator 2, the second stator 3, and the housing 1.

[0042] This embodiment describes a sweeping motor for an electric toothbrush. The housing 1 contains a cooling fin 8. The outer wall of the cooling fin 8 abuts against both the housing 1 and the first stator 2. The inner wall of the cooling fin 8 abuts against the second coil 72. This arrangement allows for cooling of the first stator 2 and the second coil 72.

[0043] The electric toothbrush vibration motor described in this embodiment has a mounting base 9 inside the housing 1; the limiting ring 5 is rotatably mounted on the top of the mounting base 9. This configuration ensures a stable and reliable overall structure.

[0044] In this embodiment, a vibrating motor for an electric toothbrush is provided, wherein the other end of the limiting ring 5 is provided with a sealing cavity 61; a piston 62 is provided in a sealed sliding manner within the sealing cavity 61; a connecting rod 63 is provided between the piston 62 and the locking block 52; the connecting rod 63 passes through the rotating shaft 4.

[0045] The sealed cavity 61 is provided with an air inlet 64 and an exhaust port 65 at the end away from the rotating shaft 4; the cross-sectional area of ​​the exhaust port 65 is larger than the cross-sectional area of ​​the air inlet 64; the exhaust port 65 is provided with a one-way valve 66 that opens outward from the sealed cavity 61.

[0046] Specifically, the electric toothbrush sweeping motor described in this embodiment only needs to be de-energized when it is used as a regular toothbrush. At this time, the second stator 3 and the magnetic part 31 are not magnetic. Under the action of the return spring 56, the locking block 52 moves towards the magnetic part 31, so that the locking pin 54 extends out of the telescopic hole 53 and is inserted into the locking groove 32 of the magnetic part 31. At this time, the rotating shaft 4, the second stator 3 and the housing 1 are a rigid whole, so that the rotating shaft 4 will not shake when used as a regular toothbrush.

[0047] When used as an electric toothbrush, simply power the coil assembly. The magnetic conductor 31 generates magnetic poles with the same magnetism as the permanent magnet 55, thereby driving the permanent magnet 55 and the locking block 52 to move away from the magnetic conductor 31. At the same time, the piston 62 moves towards the exhaust port 65, and the gas in the sealed cavity 61 is discharged outward through the one-way valve 66. Thus, the locking pin 54 separates from the locking groove 32 and retracts into the locking cavity 51. Meanwhile, the first stator 2 generates an alternating magnetic field. Under the action of the first stator 2 and the magnet assembly, the rotating shaft 4 is driven to perform sweeping rotation.

[0048] During the rotation of the shaft 4, the permanent magnet 55 and the magnetic guide part 31 are misaligned. Under the action of the return spring 56, the locking block 52 begins to move closer to the magnetic guide part 31, and at the same time, the piston 62 begins to move away from the exhaust port 65. Gas enters the sealed cavity 61 from the air inlet 64. Since the cross-sectional area of ​​the air inlet 64 is much smaller than the cross-sectional area of ​​the exhaust port 65, the piston 62 and the locking block 52 move slowly. During this process, the locking pin 54 does not protrude from the telescopic hole 53. After the permanent magnet 55 and the magnetic guide part 31 are realigned, the magnetic guide part 31 generates magnetic poles with the same magnetism as the permanent magnet 55 again, which pushes the permanent magnet 55 and the locking block 52 to move away from the magnetic guide part 31 again.

[0049] The electric toothbrush vibration motor described in this embodiment has an air intake duct 91 connected to an air inlet 64 in the mounting base 9; an exhaust duct connected to an exhaust outlet 65 in the mounting base 9; a cooling air duct 81 in the cooling plate 8; and the two ends of the cooling air duct 81 are connected to the air intake duct 91 and the exhaust duct, respectively.

[0050] Specifically, this embodiment, through the above-mentioned arrangement, enables the air to flow between the sealing cavity 61, exhaust port 65, exhaust channel, cooling air channel 81, air inlet channel 91 and air inlet 64 during the movement of the locking block 52, thereby further enhancing the cooling performance of the cooling plate 8.

[0051] In this embodiment, a sweeping motor for an electric toothbrush is described, wherein the cooling air passage 81 is arranged around the cooling fin 8. This arrangement further improves the cooling performance of the cooling fin 8.

[0052] In this embodiment, a sweeping motor for an electric toothbrush is provided with a counterweight 67 at the end of the piston 62 away from the exhaust port 65. Specifically, through the above arrangement, during the sweeping rotation of the rotating shaft 4, the counterweight 67 can drive the piston 62 to move closer to the exhaust port 65 under the action of centrifugal force, thereby driving the locking block 52 to move away from the telescopic hole 53, thus further preventing the locking pin 54 from protruding from the telescopic hole 53 during the rotation of the rotating shaft 4.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An electrically driven toothbrush using a scanning vibration motor, characterized by: Including shell (1);The first stator (2) and the second stator (3) are fixed in the shell (1);The shell (1) is rotationally provided with a rotating shaft (4);The rotating shaft (4) is connected with a magnetic steel assembly;The magnetic steel assembly is rotationally arranged in the first stator (2);The first stator (2) and the second stator (3) are provided with a coil assembly; The second stator (3) is provided with a magnetic conducting portion (31) at the bottom of the first stator (2);The bottom of the rotating shaft (4) is fixedly provided with a limiting ring (5);One end of the limiting ring (5) is provided with a locking cavity (51);The locking cavity (51) is slidably provided with a locking block (52);The limiting ring (5) is provided with a telescopic hole (53) in communication with the locking cavity (51);The locking block (52) is provided with a locking pin (54);The locking pin (54) is telescopically arranged in the telescopic hole (53);One end of the locking block (52) close to the telescopic hole (53) is provided with a permanent magnet (55);The end of the locking block (52) away from the telescopic hole (53) and the locking cavity (51) are provided with a reset spring (56);The magnetic conducting portion (31) is provided with a locking groove (32) matched with the locking pin (54); One end of the first stator (2) is provided with a first magnetic arm (21);The other end of the first stator (2) is provided with a second magnetic arm (22);One side of the first magnetic arm (21) is provided with a first left magnetic tooth (23), and the other side of the first magnetic arm (21) is provided with a first right magnetic tooth (24);One side of the second magnetic arm (22) is provided with a second left magnetic tooth (25), and the other side of the second magnetic arm (22) is provided with a second right magnetic tooth (26);The rotating shaft (4) is arranged between the first left magnetic tooth (23), the first right magnetic tooth (24), the second left magnetic tooth (25) and the second right magnetic tooth (26); The magnetic steel assembly comprises a first magnetic steel (41), a second magnetic steel (42), a third magnetic steel (43) and a fourth magnetic steel (44) arranged around the outer periphery of the rotating shaft (4);The first magnetic steel (41), the second magnetic steel (42), the third magnetic steel (43) and the fourth magnetic steel (44) all extend along the length direction of the rotating shaft (4); The first magnetic steel (41), the second magnetic steel (42), the third magnetic steel (43) and the fourth magnetic steel (44) are respectively arranged corresponding to the first left magnetic tooth (23), the first right magnetic tooth (24), the second left magnetic tooth (25) and the second right magnetic tooth (26); The second stator (3) comprises a strip-shaped winding portion (33);The strip-shaped winding portion (33) is arranged at the bottom of the first magnetic arm (21);The coil assembly comprises a first coil (71) arranged around the strip-shaped winding portion (33) and the first magnetic arm (21), and a second coil (72) arranged around the second magnetic arm (22); The shell (1) is provided with a cooling fin (8);The outer wall of the cooling fin (8) abuts against the shell (1) and the first stator (2) respectively;The inner wall of the cooling fin (8) abuts against the second coil (72); The housing (1) is internally provided with a mounting seat (9); the limiting ring (5) is rotatably arranged on the top of the mounting seat (9); The other end of the limiting ring (5) is provided with a sealing cavity (61); the sealing cavity (61) is internally slidably provided with a piston (62); the piston (62) and the locking block (52) are provided with a connecting rod (63); the connecting rod (63) penetrates through the rotating shaft (4); The sealing cavity (61) is provided with an air inlet (64) and an air outlet (65) away from the rotating shaft (4); the cross-sectional area of the air outlet (65) is greater than that of the air inlet (64); the air outlet (65) is provided with a one-way valve (66) opening outwardly to the sealing cavity (61); The mounting seat (9) is provided with an air inlet channel (91) in communication with the air inlet (64); the mounting seat (9) is provided with an air outlet channel in communication with the air outlet (65); The cooling fin (8) is internally provided with a cooling air channel (81); the two ends of the cooling air channel (81) are respectively in communication with the air inlet channel (91) and the air outlet channel.

2. The scanning vibration motor for electric toothbrush according to claim 1, characterized in that: One side of the strip-shaped winding part (33) is provided with a first connecting arm (34); the other side of the strip-shaped winding part (33) is provided with a second connecting arm (35).

3. The scanning motor for electric toothbrush according to claim 1, wherein: The cooling air channel (81) is arranged around the cooling fin (8).

4. The scanning motor for electric toothbrush according to claim 1, wherein: The piston (62) is provided with a counterweight (67) away from the air outlet (65).

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