WO2023274188A1 - 清洁护理用具及其换能装置和压力报警机构 - Google Patents

清洁护理用具及其换能装置和压力报警机构 Download PDF

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Publication number
WO2023274188A1
WO2023274188A1 PCT/CN2022/101744 CN2022101744W WO2023274188A1 WO 2023274188 A1 WO2023274188 A1 WO 2023274188A1 CN 2022101744 W CN2022101744 W CN 2022101744W WO 2023274188 A1 WO2023274188 A1 WO 2023274188A1
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WO
WIPO (PCT)
Prior art keywords
elastic member
transducer
drive shaft
proximal
cleaning
Prior art date
Application number
PCT/CN2022/101744
Other languages
English (en)
French (fr)
Inventor
戴晓国
徐振武
Original Assignee
上海携福电器有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海携福电器有限公司 filed Critical 上海携福电器有限公司
Priority to EP22832002.4A priority Critical patent/EP4366145A1/en
Priority to CA3225559A priority patent/CA3225559A1/en
Priority to JP2023580498A priority patent/JP2024522916A/ja
Publication of WO2023274188A1 publication Critical patent/WO2023274188A1/zh

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/02—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16—Power-driven cleaning or polishing devices
    • A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • A61C17/24—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like rotating continuously
    • A61C17/26—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like rotating continuously driven by electric motor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16—Power-driven cleaning or polishing devices
    • A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • A61C17/32—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating
    • A61C17/34—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor
    • A61C17/3409—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor characterized by the movement of the brush body
    • A61C17/3481—Vibrating brush body, e.g. by using eccentric weights
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/26—Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16—Power-driven cleaning or polishing devices
    • A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • A61C17/221—Control arrangements therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16—Power-driven cleaning or polishing devices
    • A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • A61C17/224—Electrical recharging arrangements

Definitions

  • the invention relates to the technical field of cleaning and nursing appliances, and more specifically, relates to a transducer device and a pressure alarm mechanism in cleaning and nursing appliances.
  • the transducer mechanism includes a drive shaft, and the transducer elastic parts fastened to the left and right side brackets of the driver are fixed. Parts, at least two permanent magnets, the corresponding permanent magnet brackets for solidly connecting the permanent magnets, the left and right side transducer transmission arms that are solidly connected with the permanent magnet brackets and the drive shaft, and at least two are arranged on the drive shaft.
  • the left transducer elastic part and the right transducer elastic part on the left and right sides of the longitudinal axis of the shaft wherein the left and right permanent magnets are independent of each other, and the magnetic pole polarity of the permanent magnet on one side is S pole in the direction of the drive coil Or N pole, the magnetic pole polarity of the permanent magnet on the other side is opposite to that of the permanent magnet on one side in the direction towards the drive coil, and the left and right permanent magnets are arranged so that their internal magnetic field lines and the direction of the longitudinal axis of the drive coil The angles are greater than 45° and less than 135° respectively, the left and right permanent magnets can move relative to the elastic member fixed part ; It is approximately parallel to the direction of the longitudinal axis of the drive coil iron core.
  • the drive shaft does not need to be equipped with ball bearings, but due to the limited ability of the elastic parts to balance the pressure on the cleaning element, long-term use will easily cause fatigue and yield of the elastic parts, thereby affecting the life of the transducer.
  • They are respectively fixedly connected with the corresponding transducer transmission arm and the transducer elastic member fixing part, so that the overall volume of the transducer is large, which is not conducive to the miniaturization of the cleaning tool. Therefore, still need to improve existing personal cleaning care appliance.
  • the present invention proposes a personal cleaning and care appliance comprising: a transducer and a driving coil, wherein the transducer includes a transducer frame, a motor attached to the transducer frame a magnet, an elastic assembly attached to the transducer frame, and a drive shaft; wherein the drive shaft has a proximal end and a distal end, and the drive shaft is affixed to the transducer frame, and the drive shaft defines a longitudinal axis, and the longitudinal axis The axis extends through a neutral plane, which is substantially perpendicular to the cleaning force on the cleaning care implement; and the drive coil is arranged relative to the magnet of the transducer, and the transducer is movable relative to the drive coil, wherein the elastic The assembly includes at least one proximal elastic member and at least one distal elastic member offset along the longitudinal axis, the proximal elastic member being closer to the proximal end of the drive shaft than the distal elastic member
  • the distance between the centerlines of the respective widths of the proximal elastic member and the distal elastic member along the longitudinal axis is at least 3.5 mm.
  • the plane of the proximal elastic member forms a first angle relative to the median plane
  • the plane of the distal elastic member forms a second angle relative to the median plane, wherein the first angle and the second angle are greater than or equal to 10 degrees And less than or equal to 90 degrees.
  • the proximal elastic member and the distal elastic member are located on opposite sides of the median plane or on the same side of the median plane, and the proximal elastic member and the distal elastic member are perpendicular to each other. On the opposite two or the same side of the vertical plane of the median plane P and including the longitudinal axis. Alternatively, the proximal elastic member and the distal elastic member are arranged along a vertical plane.
  • the proximal elastic member is made of plastic or metal
  • the distal elastic member is made of plastic
  • the proximal elastic members are arranged in pairs symmetrically with respect to the longitudinal axis, and the distal elastic members are arranged in pairs symmetrically with respect to the longitudinal axis.
  • the elastic assembly further includes at least another elastic member, at least another elastic member is made of metal, and the elastic member is biased relative to the proximal elastic member and the distal elastic member along the longitudinal axis, and the metal
  • the angle between the plane of the elastic member and the median plane is smaller than the angle between the plane of the proximal elastic member and the distal elastic member and the median plane; the total elastic modulus of the other elastic member of the metal is the distal elastic member
  • the total elastic modulus is more than twenty times.
  • the transducer frame includes a transducer frame portion enveloping the drive shaft and a pair of frame fastening walls spaced apart from the drive shaft in the radial direction, wherein the frame The fastening wall has upper and lower protrusions arranged offset on the frame fastening wall, the first edge is fixed to the transducer frame part, and the second edge is respectively fixed to the frame The upper and lower protrusions of the frame fasten the wall.
  • the present invention also provides a pressure alarm mechanism for a cleaning care appliance, comprising: a drive shaft defining a longitudinal axis and having a proximal end and a distal end, and the drive portion is attached to the drive shaft from the distal end of the shaft. Shaft, when the cleaning force F1 of the cleaning care appliance is along the first direction, the proximal end generates a first displacement along the first direction, and the proximal elastic member is fixedly connected to the drive shaft to drive along the first edge of the proximal elastic member.
  • the shaft moves, and the position of the proximal elastic member constitutes the fulcrum of the drive shaft; the distal elastic member is biased toward the distal end relative to the proximal elastic member along the longitudinal axis, and the first edge of the distal elastic member is fixedly connected to the drive shaft.
  • the shaft moves with the drive shaft, and when the cleaning force F1 is applied to the proximal end, the drive shaft at the position of the first edge of the lower elastic member produces a second displacement along a second direction opposite to the first direction; the sensing device, the sensor
  • the sensing device includes a fixed part and a movable part, wherein the movable part is arranged on the driving part.
  • the movable part When the cleaning force F1 is applied to the proximal end, the movable part generates a third displacement along the second direction relative to the fixed part.
  • the cleaning force F1 When F1 exceeds the maximum pressure F1 M , the displacement of the movable part relative to the fixed part will cause the alarm device of the pressure alarm mechanism to generate an alarm indication.
  • the proximal elastic member and the distal elastic member respectively have a second edge opposite to the first edge, and the second edge constitutes a fixed edge when the proximal elastic member and the distal elastic member elastically deform , wherein the distance between the centerlines of the respective widths of the proximal elastic member and the distal elastic member along the longitudinal axis is at least 3.5 mm.
  • the plane of the proximal elastic member forms a first angle with respect to the median plane (P), and the plane of the distal elastic member forms a second angle with respect to the median plane.
  • the first angle and the second angle are greater than or equal to 10 degrees and less than or equal to 90 degrees.
  • the longitudinal axis extends through a median plane, and the median plane is substantially perpendicular to the cleaning force
  • the plane of the proximal elastic member forms a first angle relative to the median plane P
  • the distal elastic member The plane of the plane forms a second angle relative to the median plane, wherein the first angle and the second angle are greater than or equal to 10 degrees and less than or equal to 90 degrees
  • the proximal elastic member and the distal elastic member are located on opposite sides of the median plane or located on the same side of the median plane
  • the proximal elastic member and the distal elastic member are located on opposite sides of the cleaning force direction and the plane where the longitudinal axis is located or along the cleaning force direction.
  • the driving part includes a magnet and a housing, the magnet is attached to the distal end of the driving shaft through the housing, and the movable part is farther from the proximal elastic member than the proximal end of the driving shaft.
  • the fixed part of the sensing device includes an induction device and a radiation source, and a gap is formed between the induction device and the radiation source, and the movable part includes a sensor that can move into the gap between the induction device and the radiation source.
  • the induction device and the emission source are arranged on the circuit board or the casing of the cleaning and care appliance, or on parts fixed relative to the casing.
  • the parts fixed relative to the casing include the circuit board and the battery compartment frame and the like.
  • the pressure alarm mechanism includes a pressure limiting part, the pressure limiting part limits the range of movement of the movable part, so that the maximum pressure F1 M of the sensing device is within the range of 2.5N to 15N, wherein the maximum pressure limit
  • the part is arranged on the shell of the cleaning care appliance or a part fixed relative to the shell.
  • the present invention also provides a cleaning and nursing appliance, which includes the above-mentioned transducer device or the above-mentioned pressure alarm mechanism, and the cleaning and nursing appliance includes one of an electric toothbrush, an electric shaver, an electric facial cleanser, and an electric shower. kind.
  • the driving coil is arranged so that there is no relative movement relative to the housing of the cleaning care appliance, and the driving coil is arranged in the magnetic field generated by the magnet, and the magnetic field lines generated by the magnet and the lines of force in the driving coil
  • the angle between the directions of the current I is about 90 degrees, and an alternating current I with a frequency of f0 passes through the drive coil, so that the drive coil and the magnet interact to generate a reciprocating couple with the longitudinal axis of the drive shaft as the axis, A reciprocating couple drives the transducer to resonate.
  • the transducer and the cleaning assembly of the cleaning and care appliance form a resonator
  • the driving coil and the magnet interact to generate a reciprocating force couple with the longitudinal axis L2 of the drive shaft as the axis, so
  • the reciprocating force couple drives the resonant body to resonate, and the natural frequency fn of the resonant body is between 85% and 115% of the frequency f0 of the reciprocating force couple.
  • Adopting the transducer device according to the present invention solves the problem that the elastic parts are prone to fatigue and yield, improves the service life of the transducer device, realizes the miniaturization of personal cleaning and care appliances, and is convenient to assemble, rotate smoothly, and has low noise. Low damping and safe and reliable.
  • the pressure warning mechanism can identify the amount of pressure exerted on the cleaning element.
  • FIG. 1 is a perspective view of a personal care appliance and an internal movement according to a first preferred embodiment of the present invention
  • Fig. 2 is an exploded view of the internal movement including the transducer device of the cleaning and care appliance shown in Fig. 1;
  • Fig. 3 is a perspective view of a transducer device according to a first preferred embodiment of the present invention.
  • Fig. 4 is a perspective view of the transducer device according to the first preferred embodiment of the present invention, which shows the elastic components in the transducer device;
  • Fig. 5 shows two kinds of first elastic members and drive shafts suitable for the first embodiment of the present invention
  • Fig. 6 shows two kinds of first elastic members suitable for the transducer according to the first embodiment of the present invention
  • FIG. 7 is a schematic end view showing the positional relationship of the cleaning element and the first elastic member and the second elastic member;
  • Fig. 8 shows a schematic diagram of the force of the elastic member and the cleaning assembly along the longitudinal axis according to a preferred embodiment of the present invention
  • Fig. 9 is a bottom perspective view of the transducer device and the circuit board according to the first embodiment of the present invention.
  • Fig. 10 shows a perspective view of a transducer device according to a second preferred embodiment of the present invention.
  • Fig. 11 is another perspective view of the transducing device in Fig. 10, showing the drive coil;
  • Fig. 12 is a perspective view of a transducer device according to a third embodiment of the present invention.
  • Fig. 13 is another perspective view of the transducing device shown in Fig. 12, wherein the driving coil is removed;
  • Fig. 14 is a perspective view of a transducer device according to a fourth embodiment of the present invention.
  • Fig. 15 is a schematic diagram of a combination of a drive shaft, an elastic member and a magnet in the transducing device shown in Fig. 14 according to the fourth embodiment of the present invention.
  • Fig. 16 is a schematic diagram of the elastic member in the transducer device shown in Fig. 15 according to the fourth preferred embodiment of the present invention.
  • Fig. 17 is a relationship diagram of the bracket, the elastic member and the cleaning element of the transducer device according to the fourth preferred embodiment of the present invention.
  • an electric toothbrush is taken as a typical example of a personal cleaning and care appliance, and an exemplary embodiment of the present invention is described in more detail with reference to the accompanying drawings.
  • the present invention is not limited thereto.
  • the present invention can also be applied to electric shavers, electric facial cleansers, electric showers and other cleaning care appliances that can provide cleaning actions through transducers.
  • Fig. 1 and Fig. 2 respectively show a perspective view and an exploded perspective view of a cleaning and care appliance according to a first preferred embodiment of the present invention.
  • the cleaning care appliance taking an electric toothbrush as an example.
  • the electric toothbrush mainly includes a handle 1 and a cleaning assembly detachably mounted on the handle 1 .
  • the handle 1 includes a handle housing and various functional components installed in the handle housing.
  • the cleaning assembly of the electric toothbrush is in the form of a toothbrush head comprising a cleaning element carrier 2 and cleaning elements 3 distributed on the cleaning element carrier 2 .
  • the carrier 2 of the toothbrush head is installed on the handle 1 by, for example, a snap connection.
  • the snap connection can make the driving handle 1 and the cleaning assembly reliably coupled together, and can also easily separate the driving handle 1 and the cleaning assembly.
  • the cleaning elements 3 may be objects such as bristles.
  • the functional components in the handle 1 of the cleaning and care appliance mainly include a power supply part, a control part, a trigger part and a transducing device.
  • the power supply part includes the rechargeable battery 5 and the charging circuit installed in the battery compartment 135, in order to provide power to each part of the appliance; Turn on or off, etc.;
  • the trigger part includes a switch to start and stop the operation of the electric toothbrush;
  • the energy conversion device is configured to convert the input electric energy into mechanical energy that provides the reciprocating motion of the cleaning component.
  • the transducer device mainly includes a transducer 7 , and the drive coil of the transducer device is arranged relative to the transducer 7 .
  • the transducer 7 mainly includes a transducer frame 110, a first magnet 102, a second magnet 103, a drive shaft 101 detachably assembled with a cleaning assembly, and an elastic assembly for causing resonance motion.
  • the material of the transducer frame 110 is plastic.
  • the first magnet 102 and the second magnet 103, which are part of the transducer 7 are connected to each other by means of glue, screws or injection molding.
  • the distal ends of the transducer frame 110 away from the cleaning element 3 are fixedly connected together, so that the magnets 102 , 103 become an integral part of the transducer 7 .
  • the transducer device further includes a transducer upper shell 131 and a transducer lower shell 132, which are fastened together, for example, by fastening screws 133, so that the frame fastening arm 113 of the transducer frame 110 Compress between the two housings, and lock the transducer frame 110 accordingly.
  • the upper transducer shell 131 and the lower transducer shell 132 are then further fastened to the housing of the appliance.
  • the upper and lower transducer shells may also be an integral part of the handle shell.
  • the elastic assembly of the transducer 7 includes four first elastic pieces 104 and four second elastic pieces 105 . More specifically, as shown in FIG. 4, along the drive shaft 101, the elastic assembly includes two first elastic members 104A, two second elastic members (proximal elastic members) 105A, two The second elastic piece (the distal elastic piece) 105B, and the two first elastic pieces 104B.
  • Each of the first elastic members 104A and 104B is substantially rectangular parallelepiped.
  • the distance from the first elastic members 104A and 104B at the frame fastening arm 113 to the transducer frame portion 112 is the elastic member length, and the distance between the first elastic members 104A and 104B along the longitudinal axis L2 of the drive shaft is called
  • the width of the elastic piece, the remaining length of the other side of the cuboid is the thickness of the elastic piece, and the plane formed by the respective length and width of the first elastic pieces 104A and 104B is the plane of the elastic piece.
  • each second elastic member 105 is roughly a cuboid, and the distance from the second elastic member 105A and 105B to the transducer frame portion 112 on the frame fastening arm 113 from the second elastic member 105A and 105B is the length of the elastic member , the distance between the second elastic pieces 105A and 105B along the longitudinal axis of the drive shaft is the width of the elastic piece, and the length of the other side of the cuboid is the thickness of the elastic piece.
  • a plane formed by the length and width of the second elastic members 105A and 105B is an elastic member plane.
  • the four first elastic members 104A and 104B are located in the same plane, and they are located in the median plane P of the transducer device.
  • the neutral plane P is defined as the plane perpendicular to the direction of the cleaning force F1 and the longitudinal axis L2 of the drive shaft.
  • the cleaning force F1 is perpendicular to the longitudinal axis L2 of the drive shaft.
  • the direction of the cleaning force F1 is defined as the direction of the longitudinal axis L1 of the cleaning element 3 , that is to say, the median plane P is substantially perpendicular to the longitudinal axis L1 of the cleaning element 3 .
  • the angle between the plane of the first elastic member 104 and the longitudinal axis L2 of the drive shaft is 0 degree. More specifically, in the first embodiment, the angles between the planes of the elastic members of the first elastic members 104A and 104B and the longitudinal axis L1 of the cleaning element are ⁇ 1, ⁇ 2, ⁇ 3, and ⁇ 4, respectively, as shown in FIG. 7 in this embodiment ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4 are all equal to 90 degrees, the longitudinal axis L1 of the cleaning element is perpendicular to the plane of the first elastic member.
  • the angles ⁇ 1, ⁇ 2, ⁇ 3, and ⁇ 4 can also take other different values.
  • the second elastic member 105 of the elastic assembly includes a proximal elastic member 105A and a distal elastic member 105B arranged in pairs, and the two pairs of elastic members are arranged offset along the longitudinal axis L2.
  • the proximal elastic member 105A is closer to the proximal end of the drive shaft 101
  • the distal elastic member 105B is closer to the distal end of the drive shaft 101 .
  • the plane of the second elastic member 105 is the plane connecting the housing protrusion 111 and the transducer housing portion 112 enveloping the drive shaft, preferably, the angle between this plane and the median plane where the longitudinal axis L2 is located is greater than 30 degrees , and preferably the angle between the plane and the longitudinal axis L2 is less than 30 degrees.
  • the four second elastic members 105 are arranged at an angle relative to the median plane P, in other words, the four second elastic members 105 are arranged relative to and The angular arrangement of the plane in which the longitudinal axes L1 and L2 of the cleaning elements 3 lie.
  • the proximal elastic member 105A and the distal elastic member 105B are arranged obliquely on opposite sides of the median plane P respectively. As shown in FIG.
  • the distal elastic member 105B is located at the lower side of the median plane P and is arranged at an angle relative to the median plane P.
  • the four second elastic members 105A and 105B are respectively ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4 relative to the longitudinal axis L1. It is less than or equal to 80 degrees and greater than or equal to 0 degrees. More preferably, the angles ⁇ 1, ⁇ 2, ⁇ 3, and ⁇ 4 are less than or equal to 60 degrees and greater than or equal to 0 degrees. In the first embodiment shown in FIG. 7, the angles ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4 are all equal to 60 degrees.
  • the angle between the planes of the four second elastic members 105A and 105B and the median plane P is greater than or equal to 10 degrees and less than or equal to 90 degrees, more preferably, the planes of the second elastic members 105A and 105B and the median plane P The angle between them is greater than 30 degrees and less than or equal to 90 degrees.
  • the angles between the planes of the second elastic members 105A and 105B and the median plane P are both 30 degrees. It should be understood that in other alternative embodiments, the angles ⁇ 1, ⁇ 2, ⁇ 3, and ⁇ 4 may also take different values.
  • both the first elastic member 104 and the second elastic member 105 are fixed by the transducer frame 110 .
  • the transducer housing 110 includes a transducer housing portion 112 enveloping the drive shaft and two housing fastening arms 113 disposed radially away from the transducer housing portion 112 .
  • the frame fastening arms 113 are arranged in pairs on opposite sides of the longitudinal axis L2.
  • the edges 106 of the paired first elastic members 104 are fixedly connected to the two frame fastening arms 113 respectively, and the other edge 107 of the first elastic member 104 is fixedly connected to the transducer frame part 112 enveloping the drive shaft, Corresponding substantially to the position of the longitudinal axis L2, the first elastic members 104A and 104B extend between the housing fastening arm 113 and the transducer housing portion 112 adjacent the longitudinal axis L2.
  • edges 109 of the second elastic member 105A and second elastic member 105B are respectively secured to the transducer housing portion 112 enveloping the drive shaft, while opposing edges 108 are secured to the housing securing arm 113 .
  • the frame protrusions 111 protrude from opposite sides of the frame fastening arms 113 .
  • the frame protrusion 111 is a part of the frame fastening arm 113 , therefore, the frame protrusion 111 can also be understood as a part of the transducer frame 110 .
  • Edges 108 of the second elastic member 105 are respectively fixed to a corresponding frame protrusion 111 .
  • the frame protrusion 111 may not be provided, for example, the frame protrusion 111 may be replaced by thickening the frame fastening arm 113 .
  • the materials of the two first elastic pieces 104A and the two first elastic pieces 104B distributed along the longitudinal axis L2 of the drive shaft are metal.
  • the two first elastic members 104A and 104B distributed along the longitudinal axis L2 of the drive shaft may form an integral first elastic member assembly stamped from a single sheet metal , or, it may also be formed by two elastic component assemblies each including an elastic component 204A and an elastic component 204B. In other alternative embodiments, four independent elastic elements may also be combined to form the first elastic element assembly.
  • the assembly of the above-mentioned various first elastic members can still be regarded as consisting of two independent first elastic members 104A distributed along the longitudinal axis L2 of the drive shaft, two independent first remote parts distributed along the longitudinal axis L2 of the drive shaft end elastic piece 104B.
  • the proximal elastic member may include two independent second elastic members 105A
  • the distal elastic member may include two independent second elastic members 105B.
  • four frame protrusions 111 are distributed on the transducer frame 110, and the four frame protrusions 111 are fixedly connected to the other edge 108 of the corresponding second elastic member 105A and 105B respectively, and the second The other edge 109 of the elastic members 105A and 105B is fixedly connected to the transducer frame portion 112 enveloping the drive shaft, so that the second elastic members 105A and 105B are connected between the frame protrusion 111 and the transducer frame portion enveloping the drive shaft. Shelf portions 112 extend between them.
  • the first magnet 102 and the second magnet 103 of the transducer 7 are symmetrically distributed on the upper side and the lower side of the longitudinal axis L2 of the drive shaft (the left and right sides below do not match, Pu:
  • the magnets are arranged up and down, and the driving coils are arranged left and right), that is, above and below the median plane P respectively.
  • the first drive coil 121 and the second drive coil 122 are respectively located on the left and right sides of the longitudinal axis L2 of the drive shaft, and the first drive coil 121 and the second drive coil 122 are fixedly arranged relative to the handle housing, so that the drive coils 121 and 122 have no relative to the handle housing. relative movement.
  • the magnetic poles of the first magnet 102 and the second magnet 103 are towards the first driving coil 121 or the second driving coil 122, and the first magnet 102 and the second magnet 103 towards the same driving coil 121 or 122 have opposite magnetic poles, as shown in Figure 4
  • the magnetic pole of the first magnet 102 facing the second driving coil 122 is S pole
  • the magnetic pole of the second magnet 103 facing the second driving coil 122 is N pole.
  • the direction of the current I in the first driving coil 121 and the second driving coil 122 is perpendicular to the direction of the magnetic force lines inside the first magnet 102 and the second magnet 103 .
  • the user triggers the switch button of the electric toothbrush to start the electric toothbrush
  • the circuit board 4 in the handle 1 starts the driving coils 121, 122
  • the first driving coil 121 and the second driving coil 122 pass an alternating current of frequency f0.
  • Current I the direction of the current I in the first driving coil 121 is opposite to the direction of the current I in the second driving coil 122, if the direction of the current I in the first driving coil 121 is clockwise, then the direction of the current I in the second driving coil 122
  • the direction of current I is counterclockwise.
  • the first magnet 102 and the second magnet 103 facing the same driving coil have opposite magnetic poles.
  • the first driving coil 121, the second driving coil 122 and the handle housing do not move relative to each other.
  • the magnetic field formed by the first magnet 102 and the second magnet 103 interacts with the electrified first driving coil 121 and the second driving coil 122 to generate electromagnetic force.
  • the electromagnetic force received on the first magnet 102 and the second magnet 103 is equal in magnitude and opposite in direction, and the transducer 7 is subjected to a balanced electromagnetic force, but since the first magnet 102 and the second magnet 103 are respectively distributed on the drive shaft longitudinal axis L2 On the upper and lower sides, the electromagnetic force forms an electromagnetic torque M1 on the transducer 7 .
  • the direction of the electromagnetic torque M1 on the transducer 7 is correspondingly alternating, and the transducer 7 bears the current from the driving coil 121. , 122 reciprocating couple.
  • the elastic members 104 and 105 are the main parts bearing the electromagnetic forces.
  • the direction of the electromagnetic torque M1 of the transducer is counterclockwise.
  • the electromagnetic torque M1 of the transducer causes the elastic members 104A and 104B and the second elastic members 105A and 105B to produce bending elastic deformation.
  • the edges of the first elastic members 104A and 104B that are fixedly connected to the frame fastening arm 113 are fixed ends or stationary end.
  • the angle between the elastic member plane and the median plane P of the first elastic members 104A and 104B Less than 30 degrees.
  • the second elastic members 105A and 105B are also elastically deformed by reciprocating bending under the action of the electromagnetic moment M1 , so that the transducer 7 and the cleaning assembly perform resonant motion.
  • the second elastic members 105A and 105B are fixedly connected to the edge 109 of the drive shaft 101 as the movable end or resonant end of elastic deformation, and the second elastic members 105A and 105B are fixedly connected to the edge 108 of the frame protrusion 111 as an elastic end. Deformed fixed or stationary ends.
  • the material of the elastic parts 104A and 104B is metal or mainly made of metal
  • the material of the second elastic part 105A can be plastic or metal
  • the material of the second elastic part 105B is plastic or mainly made of plastic member.
  • the elastic member is metal or plastic, but it should be understood that the elastic member may be a composite of metal and plastic.
  • the elastic member is a metal and plastic composite when neither the metal nor the plastic contributes more than 60% of the stiffness coefficient of the elastic member.
  • the material of the second elastic member 105 is plastic or mainly composed of plastic. As shown in FIG. 4 , the width of the second elastic members 105A and 105B is set to be larger than the width of the first elastic members 104A and 104B.
  • the elastic member is equivalent to a linear spring.
  • the equivalent linear spring stiffness coefficient of the elastic member is:
  • E is the modulus of elasticity of the material
  • Iz is the moment of inertia of the elastic member corresponding to the driving force or the driving moment
  • a is the edge of the elastic member 104 at which the elastic member is stationary relative to the handle shell for the driving force at the point of action of the elastic member 106 or the edge 108 of the elastic member 105.
  • a of the first elastic members 104A and 104B is the first elastic member a 1
  • a of the second elastic members 105A and 105B is the second elastic member a 2 .
  • the spring stiffness coefficient corresponding to the first elastic elements 104A and 104B is the first elastic element stiffness coefficient K 1
  • the spring stiffness coefficient corresponding to the second elastic elements 105A and 105B is the second elastic element stiffness coefficient K 2 .
  • the elastic modulus E 1 of the material of the first elastic members 104A and 104B is greater than 20 times the elastic modulus E 2 of the material of the second elastic members 105A and 105B.
  • the material of the first elastic members 104A and 104B is stainless steel
  • the elastic modulus E 1 is 196Gpa
  • the material of the second elastic members 105A and 105B is POM
  • the elastic modulus E 2 is 2.5Gpa.
  • the moment of inertia of the first elastic members 104A and 104B relative to the electromagnetic torque M1 is the moment of inertia I Z1 of the first elastic member
  • the moment of inertia of the second elastic members 105A and 105B relative to the electromagnetic torque M1 is the moment of inertia I of the second elastic member Z2 .
  • the moment of inertia of a cuboid is:
  • b is the width corresponding to the above-mentioned elastic member
  • h is the thickness corresponding to the above-mentioned elastic member.
  • b in the moments of inertia I Z1 of the first elastic members 104A and 104B is 1.3 mm
  • b in the moments of inertia I Z2 of the second elastic members 105A and 105B is 3.5 mm
  • the first elastic The h in the moment of inertia I Z1 of the parts 104A and 104B is 0.16 mm
  • the h in the moment of inertia I Z2 of the second elastic parts 105A and 105B is 0.3 mm.
  • the second elastic member a 2 *cos( ⁇ 1 ⁇ 1 ) is greater than or equal to the first elastic member a 1 .
  • ⁇ 1 is 90 degrees and ⁇ 1 is 60 degrees.
  • the angle of the plane of the first elastic member relative to the longitudinal axis L1 of the cleaning element is the angle ⁇ .
  • the angle of the plane of the second elastic member with respect to the longitudinal axis of the cleaning element is an angle ⁇ , and the angle ⁇ 1 is greater than the angle ⁇ 1.
  • the other edge 106 of the second elastic member is fixedly connected to the frame fastening arm 113, the edge 109 of the second elastic member is fixedly connected to the transducer frame portion 112 enveloping the drive shaft, and the other end of the second elastic member is fixedly connected to the frame protrusion 111 , so as to ensure that a 2 of the second elastic member is greater than a 1 of the first elastic member.
  • E 1 *I z1 /(a 1 3 ) of the first elastic member is greater than 6.8 times of E 2 *I z2 /(a 2 3 ) of the second elastic member, that is, the stiffness coefficient K 1 of the first elastic member It is greater than 6.8 times of the stiffness coefficient K 2 of the second elastic member.
  • the equivalent mass of the vibrating body composed of the transducer 7 and the cleaning assembly relative to the longitudinal axis L2 of the drive shaft is M m
  • the natural frequency of the vibrating body is f n
  • K n is the sum of the stiffness coefficients of all first elastic elements plus the stiffness coefficients of all second elastic elements.
  • the sum of the stiffness coefficients of the first elastic parts is K 1t
  • the sum of the stiffness coefficients of the second elastic parts is K 2t .
  • the mechanical part When the driving frequency f 0 is equal to the mechanical natural frequency f n , the mechanical part is in forced resonance motion.
  • the driving coil passes an alternating current I with a frequency of f0, the transducer 7 and the cleaning component are subjected to an electromagnetic force with a frequency of f0 , and the frequency f0 of the driving force is between 85% of the natural frequency fn of the transducer 7 to 115%.
  • the frequency f 0 of the driving force is usually between 85% and 115% of the mechanical natural frequency f n , it can be considered that the mechanical part is in forced resonant motion, and the electric energy of the resonant motion and the resonant motion is converted into mechanical energy efficiency very high.
  • the elastic member will consume part of the energy due to the internal force of the material, which is equivalent to the energy consumed by the internal resistance of the material.
  • This part of the energy is expressed as the phenomenon of heating of the elastic member material, and the elastic modulus
  • the first elastic members 104A and 104B are mainly made of metal, and the first elastic members have a higher elastic modulus
  • the second elastic members 105A and 105B are mainly made of plastic, and the elastic modulus of the second elastic members 105A and 105B is Smaller, the heat dissipation effect of metal materials is much better than that of plastic materials.
  • the temperature rise of the first elastic members 104A and 104B is much lower than that of the second elastic members 105A and 105B.
  • An increase in temperature will decrease the modulus of elasticity of the material of the elastic member, thereby reducing the coefficient of stiffness of the elastic member.
  • the temperature rise of the first elastic members 104A and 104B has a limited influence on the coefficient of stiffness of the first elastic member, so it can be ignored, and the temperature rise of the second elastic members 105A and 105B liter has a great influence on the stiffness coefficient of the second elastic member.
  • the second elastic members 105A and 105B are The angle coefficient drops to zero due to temperature rise, when (K 1t +K 2t ) 2 /(K 1t ) 2 ⁇ 1.15/0.85, when K 1t >6.13K 2t , the transducer 7 and the cleaning component are in the working cycle It is always in a state of resonance motion.
  • the spring stiffness coefficients in the natural frequencies of the transducer 7 and the cleaning assembly mainly depend on the stiffness coefficients of the first elastic members 104A and 104B. In the first embodiment, the sum of the stiffness coefficients of all the first elastic members is greater than 6.13 times the sum of the stiffness coefficients of all the second elastic members, so as to ensure that the transducer is always in an efficient resonance state during the working cycle.
  • the material of the proximal elastic member 105A can be metal or mainly composed of metal
  • the material of the distal elastic member 105B is plastic or mainly composed of plastic
  • the sum of the stiffness coefficients of all first elastic members is added to The sum of the stiffness coefficients of all the proximal second elastic members is greater than 6.13 times the sum of the stiffness coefficients of all the second lower elastic members.
  • the material of the first elastic members 104A and 104B is metal
  • the material of the second elastic member 105B is plastic
  • the modulus of elasticity of the first elastic members 104A and 104B is equal to the modulus of elasticity of the second elastic member 105B. More than 20 times.
  • the angle of the plane of the first elastic member relative to the longitudinal axis of the cleaning element is an angle ⁇ .
  • the plane of the second resilient member is at an angle ⁇ with respect to the longitudinal axis of the cleaning element, and the angle ⁇ is greater than the angle ⁇ .
  • Fig. 8 shows a schematic diagram of forces acting on the elastic member and the cleaning assembly along the longitudinal axis according to a preferred embodiment of the present invention.
  • the equivalent force on the second elastic member 105A is F2 and the equivalent force on the second elastic member 105B is F3 .
  • the pressure F1 exerted on the cleaning element 3 is approximately parallel to the cleaning element longitudinal axis L1.
  • the planes of the second elastic members 105A and 105B form an angle ⁇ less than 80 degrees, specifically 60 degrees, with respect to the longitudinal axis L1 of the cleaning element.
  • the second elastic members 105A and 105B can generate component forces parallel to the longitudinal axis L1 of the cleaning element, because the edges 109 of the second elastic members 105A and 105B are fixedly connected to the transducer frame portion 112, while the other edge 108 is fixedly connected to the frame protrusion 111, according to the principle of moment balance and force balance, the direction of the equivalent force F2 on the second elastic member 105A is opposite to the direction of the pressure F1, and the direction of the equivalent force F2 on the second elastic member 105B is opposite.
  • the direction of the equivalent force F3 is the same as the direction of the pressure F1, the second elastic member 105A is stretched to generate the equivalent force F2, and the second elastic member 105B is stretched to generate the equivalent force F3.
  • the component force of the pressure F1 perpendicular to the plane of the second elastic member 105A and 105B causes the pressure bending deformation of the second elastic member, and this pressure bending deformation will additionally increase the internal stress of the second elastic member, which may cause the second elastic member
  • the yielding of the elastic member causes a drastic change in the natural frequency of the transducer 7, and the transducer fails.
  • the angle ⁇ is less than 80 degrees and greater than or equal to 0 degrees.
  • the angle ⁇ is less than or equal to 60 degrees, and greater than or equal to 0 degrees, so as to effectively reduce the component force of the pressure F1 on the plane perpendicular to the second elastic members 105A and 105B, thereby reducing the force caused by the pressure F1 on the second elastic members 105A and 105B.
  • the pressure bending deformation is less than or equal to 60 degrees, and greater than or equal to 0 degrees, so as to effectively reduce the component force of the pressure F1 on the plane perpendicular to the second elastic members 105A and 105B, thereby reducing the force caused by the pressure F1 on the second elastic members 105A and 105B.
  • the centerline L3 of the second elastic member 105A is more than 3.5 mm away from the centerline L4 of at least one second elastic member 105B, and the centerline is located on the plane of the second elastic members 105A and 105B and Pointing from the frame protrusion 111 to the second elastic member plane centerline of the transducer frame portion 112 enveloping the drive shaft, it can also be understood that the centerline is located on the second elastic member 105A and 105B plane and from the transducer
  • the transducer housing 110 is directed towards the centerline of the second elastic member plane of the transducer housing portion 112 enveloping the drive shaft.
  • the centerline L3 of at least one proximal second elastic member is more than 3.5 mm from the centerline L4 of at least one distal second elastic member, compared with only one second elastic member 105A, the pressure on the cleaning element 3 can be avoided
  • the torsional deformation caused by F1 to the second elastic member 105 avoids excessive stress of the second elastic member, thereby avoiding failure of the transducer 7 .
  • the tension or compression of the materials of the second elastic member 105A and the second elastic member 105B can balance the cleaning element pressure F1 and the moment M F generated by the cleaning element pressure F1.
  • the second elastic member 105A at the proximal end corresponds to the action point of the force on the drive shaft 101 as point O1
  • the moment M F generated by the pressure F1 of the cleaning element is the moment formed by the pressure F1 of the cleaning element relative to the point O1
  • the moment M F is The direction is clockwise. According to the force analysis and moment balance in Fig.
  • the material of the second elastic member 105A and the second elastic member 105B is stretched, and the stretched distance of the second elastic member 105A is Y 1 , and the material of the second elastic member 105B is pulled The extended distance is Y 2 .
  • Y2 is proportional to (F3/E)
  • the equivalent force F3 on the second elastic member 105B has the effect of balance moment M F
  • E is the modulus of elasticity of the material of the second elastic member 105B.
  • the material of the second elastic member 105B is plastic
  • the material of the first elastic member 104 is metal
  • the modulus of elasticity of the material of the first elastic member 104 is more than twenty times that of the material of the second elastic member 105B .
  • the plastic second elastic member 105B is creatively introduced, according to Y2 proportional to (F3/E), under the same F3 condition, under the same cleaning element pressure F1, the plastic second elastic member 105B Compared with the metal second elastic member 105B, the stretched distance Y 2 of the material of the second elastic member 105B can be more than 20 times greater.
  • the second elastic member 105A and 105B can be rotated 180 degrees around the longitudinal axis L2 of the drive shaft, then Y2 becomes the compressed distance of the material of the second elastic member 105B, therefore, Y2 is the second elastic member 105B The distance the material is stretched or compressed.
  • the drive shaft based on the proximal elastic member 105A, the distal elastic member 105B and the transducer frame can constitute a pressure alarm mechanism for an electric toothbrush, which is configured to exert a cleaning force on the brush head exceeding a predetermined value when an alert is issued.
  • the pressure alarm mechanism includes a sensing device, and the sensing device includes at least one movable part, which is arranged on the magnet at the far end of the drive shaft or on the transducer frame, preferably, arranged on the magnet along the longitudinal axis L2.
  • the movable part when the cleaning force F1 is applied to the proximal end, the movable part produces a third displacement Y 3 along the second direction, when the cleaning force F1 exceeds the maximum pressure F1
  • the displacement of the movable part causes the alarm device of the pressure alarm mechanism to generate an alarm indication.
  • the second elastic member 105B and the drive shaft portion at this position will generate a displacement Y 2 opposite to the pressure F1 of the cleaning element.
  • the part of the transducer frame 110 and the magnet farther away from the cleaning element 3 than the second elastic member 105A under the action of the pressure F1 of the cleaning element, produces a displacement Y 3 opposite to the pressure F1 of the cleaning element. Since the second elastic member 105B and the second elastic member 105A are fixedly connected to the transducer frame portion 112 enveloping the drive shaft, the displacement Y 3 is proportional to the displacement Y 2 .
  • the movable part includes a frame follower block 114 arranged at the tail of the transducer frame 110 away from the cleaning element 3, and the frame follower block 114 is in a convex shape, Under the action of the cleaning element pressure F1, the second elastic member 105B is in a state of elastic deformation, and the frame follower block 114 produces a displacement Y 3 opposite to the direction of the cleaning element pressure F1, and the displacement Y 3 increases with the increase of the cleaning element pressure F1 And become bigger.
  • the circuit board 4 is respectively arranged with such as LED light sources 402 and photosensitive devices 401 as sensing devices on both sides of the adjacent frame follower block 114.
  • the circuit board 4 senses the change of the pressure F1 by detecting the equivalent resistance of the photosensitive device 401 .
  • the displacement Y3 of the frame follower block 114 became larger, and the frame follower block 114 further entered the gap between the light source 402 and the photosensitive device 401, and the photosensitive device
  • the luminous flux from the light source 402 obtained by 401 decreases accordingly, the equivalent resistance of the photosensitive device 401 increases, and the circuit board 4 detects that the equivalent resistance of the photosensitive device 401 becomes larger, realizing the recognition of the increase in the pressure F1 of the cleaning element.
  • the electric toothbrush can remind the user that the pressure F1 on the cleaning element is too high by means of sound, light, vibration, etc., and remind the user to reduce the pressure F1 on the cleaning element.
  • the displacement Y3 of the frame follower 114 becomes smaller, and the frame follower 114 reduces the gap between the light source 402 and the photosensitive device 401, and the photosensitive
  • the luminous flux from the light source 402 that can be obtained by the device 401 increases accordingly, the equivalent resistance of the photosensitive device 401 becomes smaller, and the circuit board 4 detects that the equivalent resistance of the photosensitive device 401 becomes smaller, realizing the recognition of the increase in the pressure F1 of the cleaning element , when the pressure F1 of the cleaning element is less than the preset excessive pressure threshold, the electric toothbrush quits sound, light, vibration and other reminders.
  • the displacement Y 3 is effectively enlarged, that is, the distance away from the cleaning element 3 relative to the second elastic member 105A is effectively enlarged.
  • the displacement of the part of the transducer frame 110 and the magnet under the action of the pressure F1 of the cleaning element is opposite to the direction of the pressure F1 of the cleaning element.
  • the embodiment of the alarm mechanism can be properly deformed, for example, a through hole can be set on the frame follower block 114, when the cleaning element pressure F1 is zero, the light of the light source 402 has no or a small amount of light passing through the frame follower block 114.
  • the hole is incident on the photosensitive surface of the photosensitive device 401, and the rest of the frame follower block 114 blocks the light from the light source 402 from incident on the photosensitive surface of the photosensitive device 401.
  • the equivalent resistance of the photosensitive device 401 is relatively large.
  • the cleaning element pressure F1 became larger, more light from the LED 402 was incident on the photosensitive surface of the photosensitive device 401 through the through hole of the frame follower block 114.
  • the equivalent resistance of the photosensitive device 401 became smaller, thereby The detection of the pressure F1 of the cleaning element by the circuit board 4 is realized.
  • the frame follower 114 has a convex shape relative to the surface of the magnet.
  • the frame follower 114 can be in a concave shape, a plane shape or a curved surface shape, and the displacement Y 3 , making at least one surface of the follower block 114 close to or away from the photosensitive device 401, so that the incident angle at which the photosensitive device 401 can receive light from the light source 402 changes, so that the luminous flux on the photosensitive device 401 changes monotonously with the pressure F1 of the cleaning element And monotonically changing.
  • the magnet can also be used as a movable part of the sensing device, and a magnetic field induction device such as a Hall element or a coil is installed on the circuit board 4 by utilizing the displacement Y 3 of the magnet far away from the cleaning element, and the displacement Y 3 of the magnet causes the magnetic field induction device to Changes in the strength of the upper magnetic field result in changes in the voltage value of the magnetic field induction device, thereby realizing the detection of the pressure F1 of the circuit board 4 on the cleaning element.
  • a magnetic field induction device such as a Hall element or a coil
  • the transducer device is set to have an activation pressure F4.
  • a spring can be installed on the part of the transducer frame 110 and the magnet farther away from the cleaning element than the second elastic member 105A for pretensioning. Only when the cleaning element pressure F1 is greater than the cleaning element activation pressure F4, the proximal second Only the elastic member and the second elastic member at the far end can generate the displacement Y 2 and the displacement Y 3 .
  • the transducer device is further provided with a maximum pressure restricting portion that limits the pressure F1 to a maximum pressure F1 M , that is, the transducer device is configured to have a maximum pressure F1 M .
  • a through hole 403 is opened on the circuit board, and the through hole 403 can allow the frame follower block 114 to pass through and contact the handle shell.
  • the frame follower block 114 contacts the handle shell, and the handle shell forms a maximum pressure limiting part, which limits the further movement of the frame follower block 114,
  • the displacement Y 2 and the displacement Y 3 no longer increase, so as to ensure that the second elastic member is always within the range of elastic deformation. Only when the pressure F1 is less than the maximum pressure F1M and greater than the cleaning element activation pressure F4, with the monotonous change of the pressure F1, the displacement Y2 and the displacement Y3 monotonically change.
  • the maximum pressure F1 M of the cleaning element ranges from 2.5N to 10N, and the activation pressure F4 of the cleaning element is greater than or equal to 0N and less than or equal to 2N.
  • the handle shell or a part that is stationary relative to the handle shell constrains the transducer 7 so that the displacement Y 2 and the displacement Y 3 no longer monotonically change .
  • the pressure F1 on the cleaning element 3 will cause additional bending deformation of the first elastic members 104A and 104B.
  • the present invention introduces the second elastic members 105A and 105B to balance the The force and moment caused by the pressure F1 of the cleaning element 3 greatly reduce the additional bending deformation of the first elastic members 104A and 104B caused by the pressure F1 on the cleaning element 3, so that the transducer 7 can work in a resonant state for a long life, and
  • the second distal elastic member 105B has limited influence on the spring stiffness coefficient in the natural frequency of the transducer, which makes frequency adjustment of the transducer 7 easier.
  • the first elastic parts 104A and 104B and the second elastic parts 105A and 105B can be completed by injection molding process, and the transducer 7 is easy to manufacture.
  • first elastic member 104A located on the left side of the drive shaft in FIG. 4
  • first elastic member 104B located on the right side of the drive shaft in FIG. 4
  • first elastic member 104B one first elastic member can still meet the above-mentioned requirements for the first elastic member combination, and one first elastic member can still achieve the purpose of the present invention.
  • the two second elastic members include a second elastic member 105A and a second elastic member 105B, such as only one
  • the second elastic member 105A on the left side of the drive shaft has only one second elastic member 105B located on the right side of the drive shaft in FIG. on both sides of a vertical plane that is plane P and includes the longitudinal axis L2.
  • the elastic assembly of one second elastic member 105A and one second elastic member 105B can still meet the requirements of the present invention for the combination of the second elastic member, and can achieve the purpose of the present invention.
  • the second elastic member may be located on the same side of the median plane P, or may also be located on the same side of a vertical plane perpendicular to the median plane P and including the longitudinal axis L2.
  • FIG. 10 and 11 show perspective views of a transducer device according to a second embodiment of the present invention, wherein the magnet coil mechanism of the transducer device has a different structure from the magnet coil mechanism in the first embodiment.
  • the drive coil 221 is centrally arranged relative to the longitudinal axis L2 of the drive shaft, the magnets 202 and 203 are respectively distributed on both sides of the drive coil 221, and the transducer frame 110 is centered on the longitudinal axis L2 of the drive shaft to both sides. side and further downwards to form two support arms 115, and the two magnets are respectively fastened on the respective support arms 115, and the magnetic field formed by the magnets passes through the driving coil.
  • the arrangement of the magnets 202, 203 and the driving coil 221 can still achieve the purpose of the present invention.
  • FIG. 12 and 13 show perspective views of a transducer according to a third embodiment of the present invention.
  • a hollow cylindrical magnet 302 is fastened on the drive shaft 101, and the driving coils 321, 322, 323, 324 are arranged around the outside of the hollow cylindrical magnet, and the magnetic field formed by the magnet passes through the drive shaft.
  • the arrangement of the magnet and the driving coil as shown in Fig. 12 and Fig. 13 can still achieve the purpose of the present invention.
  • the positions of the magnet, the driving coil and the elastic member relative to the cleaning element 3 can be changed, for example, the magnet and the driving coil are closer to the cleaning element 3, or the magnet and the driving coil are interposed between two second elastic members.
  • the fixed end or stationary end of the elastic member is located on the longitudinal axis of the drive shaft, and a cn is the distance from the driving force to the longitudinal axis of the drive shaft, which is also a in the formula for calculating the stiffness coefficient of the elastic member , and the force couple of the driving force is the driving force multiplied by a cn , and maintaining a small driving force to ensure a sufficient force couple, a cn must be large enough.
  • the size of the elastic member should be slightly larger.
  • the existing transducer devices all have relatively large dimensions.
  • the first elastic member 104 bears the electromagnetic torque M1 on the drive shaft.
  • Two frame fastening arms 113 are distributed on the transducer frame 110, and the two frame fastening arms 113 are respectively fixedly connected to the other edge 106 of the corresponding first elastic members 104A and 104B, and the first elastic members 104A and The edge 107 of 104B is fixedly connected to the transducer frame portion 112, the transducer frame portion 112 enveloping the drive shaft envelops part of the drive shaft 110, and the first elastic members 104A and 104B are fastened between the frame fastening arm 113 and the enveloping portion of the drive shaft 110. Extends between the transducer housing portion 112 of the network drive shaft.
  • the distance from the longitudinal axis L2 of the drive shaft to the edge 106 of the first elastic member is a in the formula for calculating the coefficient of stiffness of the elastic member.
  • the distance from the longitudinal axis L2 of the drive shaft to the other end 106 of the first elastic member has no direct relationship with the moment arm of the electromagnetic couple M1, therefore, the distance from the longitudinal axis L2 of the drive shaft to the edge 106 of the first elastic member can be small enough to ensure the elasticity
  • the size of the components can be smaller, and the overall size of the transducer 7 can be smaller, thereby realizing the miniaturization of the cleaning device.
  • the dislocation distribution of the second elastic member 105A and the plastic second elastic member 105B along the longitudinal axis L2 of the drive shaft is used to realize the displacement caused by the pressure F1 of the cleaning element
  • the amplification of Y3 realizes the detection of the pressure F1 of the cleaning element.
  • the detection of the cleaning element pressure F1 is required in some cleaning appliances, such as in electric toothbrushes, excessive cleaning element pressure F1 will damage the gums, so it is necessary to remind the user of the pressure F1.
  • the cleaning appliance does not have a strong demand for detecting the pressure F1 of the cleaning element, but it is hoped that the transducer and the cleaning component are within the resonance range, so that the pressure F1 on the cleaning element can be greater.
  • the present invention provides another kind of scheme, the material of all the second elastic parts in the above-mentioned embodiment is replaced by metal, namely, as shown in Fig. 14, Fig. 15, Fig. 16, Fig. The fourth embodiment.
  • the transducer 7' comprises a drive shaft 501, two proximal elastic members 505A distributed along the drive shaft longitudinal axis L2, Two distal elastic members 505B, a magnet 502 and a magnet 503 and a transducer frame 510 are distributed. Both magnets 502 and 503 are fixed to the transducer housing 510 .
  • the material of the transducer frame 510 is plastic, the drive shaft 501, the proximal elastic member 505A and the distal elastic member 505B are connected together through the transducer frame 510, and the magnets 502 and 503 are connected by glue or screws or injection molding and transduction.
  • the tails of the machine frame away from the cleaning elements are fixedly connected together.
  • the elastic assembly of the transducer 7' should include at least one proximal elastic member 505A and one distal elastic member 505B, and one second proximal elastic member 505A and one second distal elastic member 505B They are respectively located on opposite sides of the median plane P where the longitudinal axis L2 of the drive shaft is located.
  • a proximal elastic member 505A and a distal elastic member 505B distributed on both sides of the median plane P can withstand the electromagnetic force from both sides of the longitudinal axis L2 of the drive shaft, so that the force on the transducer is balanced, and noise and impact are reduced .
  • the transducer 7' is provided with two proximal elastic members 505A and two distal elastic members 505B, the proximal elastic members 505A and the distal elastic members 505B have different inclination angles and Staggered forward and backward along the longitudinal axis L2, wherein the proximal elastic member 505A is closer to the proximal end of the drive shaft 501 than the distal elastic member 505B.
  • the transducer housing 510 includes a housing portion 512 enveloping the drive shaft and a housing fastening arm 513 from which a housing protrusion 511 protrudes.
  • the proximal elastic member 505A and the distal elastic member 505B are fixedly connected with the frame protrusion 511 and the frame portion 512 enveloping the drive shaft respectively.
  • four frame projections 511 are distributed on the transducer frame 510, and the four frame projections 511 are respectively fixedly connected to the edges 508 of the corresponding elastic members 505A and 505B, and the edges 508 of the elastic members 505A and 505B are
  • the other edge 509 is fixedly attached to the transducer housing portion 512 of the enveloping drive shaft 501, and the elastic members 505A and 505B extend between the housing protrusion 511 and the transducer housing portion 512 of the enveloping drive shaft.
  • the frame protrusion 511 can be replaced by thickening the frame fastening arm 513 without affecting the implementation of the present invention.
  • the elastic members 505A and 505B are roughly cuboid, the distance from the elastic members 505A and 505B at the frame protrusion 511 to the transducer housing portion 512 enveloping the drive shaft is the length of the elastic members, and the elastic members 505A and 505B are along the drive shaft.
  • the distance in the longitudinal direction of the shaft is the width of the elastic piece, and the length of the other side of the cuboid is the thickness of the elastic piece.
  • the plane formed by the respective length and width of the elastic members 505A and 505B is the elastic member plane.
  • the plane of the elastic member is the plane connecting the frame protrusion 511 and the transducer frame portion 512 enveloping the drive shaft.
  • the included angle between the plane and the longitudinal axis L2 of the drive shaft is less than 30 degrees.
  • the angles between the planes of the four elastic members 505A and 505B and the longitudinal axis L1 of the cleaning element are ⁇ 1, ⁇ 2, ⁇ 3, and ⁇ 4, respectively.
  • ⁇ 1, ⁇ 2, ⁇ 3, and ⁇ 4 are all equal to 60 degrees.
  • the angle between the planes of the elastic members 505A and 505B and the median plane P is 30 degrees. It should be understood that in other alternative embodiments, ⁇ 1, ⁇ 2, ⁇ 3, and ⁇ 4 may take different values.
  • the materials of the proximal elastic member 505A and the distal elastic member 505B are both metal.
  • the elastic members 505A and 505B can form two independent elastic bodies along the longitudinal axis as shown in FIG. Through holes at both ends, these through holes are used to fix the elastic body to the longitudinal axis of the transducer frame.
  • four independent elastic members can also be combined into an elastic member assembly.
  • the elastic elements of the transducer can also have other arrangements, and these methods will also fall within the scope of the present invention.
  • the drive shaft 501 is enveloped at the end of the transducer frame away from the cleaning element, and the magnets 502 and 503 are symmetrically distributed on both sides of the longitudinal axis L2 of the drive shaft.
  • the first driving coil and the second driving coil are respectively located on both sides of the longitudinal axis L2 of the driving shaft, and the first driving coil, the second driving coil and the handle housing do not move relative to each other.
  • the magnet 502 and the magnet 503 have opposite magnetic poles facing the same driving coil, for example, the magnetic pole of the magnet 502 facing the second driving coil is S pole, and the magnetic pole of the magnet 503 facing the second driving coil is N pole.
  • the direction of the current I in the first driving coil and the second driving coil is perpendicular to the direction of the magnetic field lines inside the magnet 502 and the magnet 503 .
  • the motion analysis of the transducer 7' in the fourth embodiment is similar to the motion analysis of the transducer 7 in the first embodiment, and will not be repeated here.
  • the material of the proximal and distal elastic members 505A and 505B is metal.
  • E is the modulus of elasticity of the material
  • I z is the moment of inertia of the elastic member corresponding to the driving force or the driving moment
  • a is the other point where the driving force is at the point of action of the elastic member to which the elastic member is equivalent to the static elastic member of the handle shell The distance of the edge 508 .
  • the mechanical part When the driving frequency f 0 is equal to the mechanical natural frequency f n , the mechanical part is in forced resonance motion.
  • the driving coil passes an alternating current I with a frequency of f0 , the transducer 7' and the cleaning component are subjected to an electromagnetic force with a frequency of f0 , and the frequency f0 of the driving force is between the natural frequency fn of the transducer 7' between 85% and 115% of the
  • the frequency f 0 of the driving force when the frequency f 0 of the driving force is usually between 85% and 115% of the mechanical natural frequency f n , it can be considered that the mechanical part is in forced resonant motion, and the electric energy of the resonant motion and the resonant motion is converted into mechanical energy efficiency very high.
  • the pressure applied to the cleaning element 3 is F1
  • the equivalent force on the proximal elastic member 505A is F2
  • the equivalent force on the distal elastic member 505B is F3.
  • the pressure F1 exerted on the cleaning element 3 is parallel to the longitudinal axis L1 of the cleaning element, ie perpendicular to the median plane P.
  • the angle between the planes of the elastic members 505A and 505B relative to the longitudinal axis L1 of the cleaning element is an angle ⁇ , the angle ⁇ is less than 80 degrees, and the angle ⁇ is 60 degrees in this embodiment.
  • the elastic members 505A and 505B can generate a component force parallel to the longitudinal axis L1 of the cleaning element, because an edge 509 of the elastic members 505A and 505B is firmly connected to the transducer frame of the enveloping drive shaft Part 512, the other edge 508 is fixedly connected to the frame protrusion 511, according to the principle of moment balance and force balance, wherein the direction of the equivalent force F2 on the proximal elastic member 505A is opposite to the direction of the pressure F1, and the direction of the force F1 on the distal elastic member 505B is opposite.
  • the direction of the equivalent force F3 is the same as the direction of the pressure F1, the proximal elastic member 505A is stretched to generate the equivalent force F2, and the distal elastic member 505B is stretched to generate the equivalent force F3.
  • the component force of the pressure F1 perpendicular to the plane of the elastic element causes the pressure bending deformation of the elastic elements 505A and 505B. This pressure bending deformation will additionally increase the internal stress of the elastic element, which may cause the elastic element to yield, thus causing the transducer A drastic change in the natural frequency of the 510 can cause the transducer to fail.
  • the angle ⁇ is less than 80 degrees and greater than or equal to 0 degrees.
  • the angle ⁇ is less than or equal to 60 degrees and greater than or equal to 0 degrees, so as to effectively reduce the force component of the pressure F1 perpendicular to the plane of the third elastic member, and reduce the pressure bending deformation of the third elastic member caused by the pressure F1.
  • the distance between the equivalent force F2 on the proximal elastic member 505A and the equivalent force F3 on the distal elastic member 505B is particularly important to the moment balance.
  • the distance from the centerline L5 of the proximal elastic member to the centerline L6 of the distal elastic member is more than 3.5mm, and the centerline is located on the plane of the elastic member and points from the frame fastening arm 513 to the enveloping drive shaft.
  • the second elastic member plane centerline of the transducer housing portion 512 As shown in FIG.
  • the two elastic members 505 include a proximal elastic member 505A and a distal elastic member 505B, such as only one
  • the proximal elastic member 505A on the left side of the shaft has only one elastic member 505B located on the right side of the drive shaft in FIG. 15 , which can still meet the requirements of the present invention for the combination of elastic members.
  • the metal proximal elastic member 505A and the distal elastic member 505B in the fourth embodiment can also recognize the pressure F1 of the cleaning element.
  • the maximum cleaning element pressure F1 M of the pressure F1 on the cleaning element ranges from 3N to 15N, and the starting pressure F4 of the cleaning element is greater than or equal to 0N and less than or equal to 2.5N.
  • the elastic member arranged along the drive shaft is staggered to balance the force and moment caused by the pressure F1 on the cleaning element, reducing the additional bending deformation caused by the pressure F1 on the cleaning element 3 to the elastic member, so that The transducer can work in a resonant state for a long life, on the other hand, to ensure that the transducer and the cleaning component are within the resonance range, the force that can be exerted on the cleaning element can be greater. Furthermore, with the arrangement of the elastic members according to the present invention, miniaturization of the cleaning device can be achieved.
  • the energy transfer efficiency in the resonant state or resonance state is very high.
  • restraints such as bearings are set to prevent the cleaning device from other motions besides rotational motion, but this restraint will bring noise and energy loss, and also Increased costs.
  • the transducer due to the rational configuration of the elastic member and the permanent magnet, the transducer can rotate smoothly, thereby eliminating some constraints that must be provided to realize the rotation of the cleaning appliance.
  • the resultant electromagnetic force on the transducer 7 and the transducer is approximately zero, and the clever use of the torque acting on the transducer 7 and the transducer can save the constraint structure, so that the clean The appliance is more compact, turns more smoothly and makes less noise.

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Abstract

本发明提供清洁护理用具及其换能装置和压力报警机构。根据本发明的换能装置包括换能器，其中弹性组件至少包括一个近端弹性件和至少一个远端弹性件，近端弹性件和所端弹性件分别具有第一边缘和第二边缘，其中第一边缘固联于驱动轴以随驱动轴移动，而第二边缘近端弹性件和远端弹性件弹性变形时的固定边缘，其中近端弹性件的平面相对机架中位平面形成第一角度，远端弹性件的平面相对中位平面形成第二角度。采用根据本发明的换能装置，能够保护弹性件避免失效，减少换能装置的体积，并且能够利于弹性组件实现压力报警机构。

Description

清洁护理用具及其换能装置和压力报警机构 技术领域
本发明涉及清洁护理用具技术领域，更具体地说，涉及清洁护理用具中的换能装置和压力报警机构。
背景技术
对于如电动牙刷、电动剃须刀、电动洁面器、电动沐浴器等个人清洁护理用具而言，重要的是，应具有可将往复运动转换成使清洁元件作预期旋转运动的换能装置，这些个人清洁护理用具应该结构简单、组装方便、使用寿命长、安全可靠且体积较小。
已知有许多用于驱动清洁元件的驱动结构，例如马达、磁系统及电磁系统。有些驱动结构采用诸如滚珠轴承之类的轴承来支撑驱动器，这种结构既昂贵又复杂，而且还存在噪音及马达的阻尼。
本申请人享有另一份授权公告号为CN104617732B的中国发明专利中披露了一种个人清洁护理用具，其换能机械包括驱动轴，紧固于驱动器左、右侧支架的换能器弹性件固定件、至少两个永磁体、用于固联永磁体的相应的永磁体支架、与永磁体支架固联并与驱动轴固联的左、右侧换能器传动臂以及至少两个设置在驱动轴纵轴线左右两侧的左侧换能器弹性件和右侧换能器弹性件，其中，左、右侧永磁体相互独立，一侧永磁体在朝向驱动线圈方向的磁极极性为S极或N极，另一侧永磁体在朝向驱动线圈方向的磁极极性与一侧永磁体的磁极极性相反，左、右侧永磁体被设置成使得它们的内部磁力线方向和驱动线圈纵轴线方向的角度分别大于45°且小于135°，左、右侧永磁体可相对于弹性件固定件移动；当驱动线圈通过频率为f 0的交变电流I时，左、右侧永磁体的运动方向和驱动线圈铁芯纵轴线方向近似平行。
上述方案中，驱动轴不需要安装滚珠轴承，但由于弹性件平衡清洁元件上的压力的能力有限，长时间使用容易造成弹性件的疲劳而屈服，从而影响换能器的寿命，又由于弹性件分别与相应的换能器传动臂固联和换能器弹性件固定件固联，使得换能器的整体体积较大，不利于清洁用具的小型化。因此，仍需 对现有的个人清洁护理用具进行改进。
发明内容
为克服现有技术中的不足，本发明提出一种用于个人清洁护理用具的包括：换能器和驱动线圈，其中换能器包括换能器机架、附连到换能器机架的磁铁、附联到换能器机架的弹性组件以及驱动轴；其中驱动轴具有近端和远端，并且驱动轴固附到换能器机架，并且所述驱动轴限定纵轴线，并且纵轴线延伸通过一中位平面，该中位平面基本垂直于清洁护理用具上的清洁作用力；以及驱动线圈相对所述换能器的磁铁布置，并且换能器相对驱动线圈可动，其中，弹性组件包括沿纵轴线偏置布置的至少一个近端弹性件和至少一个远端弹性件，近端弹性件相比远端弹性件靠近驱动轴的近端，其中，近端弹性件和远端弹性件分别具有第一边缘和第二边缘，第一边缘固联于驱动轴以随驱动轴移动，第二边缘构成近端弹性件和远端弹性件弹性变形时的固定边缘，并且近端弹性件和远端弹性件各自的平面基本从所述纵轴线沿径向向外延伸。
根据本发明的较佳方面，近端弹性件和远端弹性件各自沿纵轴线的宽度的中心线之间的距离至少为3.5mm。
根据本发明的较佳方面，近端弹性件的平面相对中位平面形成第一角度，远端弹性件的平面相对中位平面形成第二角度，其中第一角度和第二角度大于等于10度且小于等于90度。
根据本发明的较佳方面，近端弹性件和远端弹性件位于中位平面的相对两侧上或者位于中位平面的同一侧上，并且近端弹性件和所述远端弹性件位于垂直于中位平面P且包含纵轴线的垂直平面的相对两或者同一侧上。或者，近端弹性件和所述远端弹性件沿着垂直平面的方向设置。
根据本发明的另一较佳方面，近端弹性件由塑料或金属构成，远端弹性件由塑料构成。
根据本发明的另一较佳方面，近端弹性件关于纵轴线对称地成对布置，远端弹性件关于纵轴线对称地成对布置。
据本发明的另一较佳方面，弹性组件还包括至少另一弹性件，至少另一弹性件由金属构成，并且弹性件沿纵轴线相对近端弹性件和远端弹性件偏置设置，金属弹性件的平面与中位平面之间的角度小于近端弹性件和远端弹性件的平面与中位平面之间的角度；金属的另一弹性件的总的弹性模量为远端弹性件 的总的弹性模量的二十倍以上。
据本发明的另一较佳方面，换能器机架包括包络驱动轴的换能器机架部分以及在径向方向与驱动轴隔开的成对的机架紧固壁，其中机架紧固壁具有上凸部和下凸部，上凸部和下凸部在机架紧固壁上偏置布置，第一边缘固定到换能器机架部分，而第二边缘分别固定到机架紧固壁的上凸部和下凸部。
本发明还提供了一种用于清洁护理用具的压力报警机构，包括：驱动轴，所述驱动轴限定纵轴线并具有近端和远端，并且驱动部从动轴的远端附连到驱动轴，当清洁护理用具的清洁作用力F1沿第一方向时，近端沿第一方向产生第一位移，近端弹性件，所近端弹性件的第一边缘固联于驱动轴以随驱动轴移动，近端弹性件所在位置构成驱动轴的支点；远端弹性件，远端弹性件相对近端弹性件沿纵轴线朝远端偏置，远端弹性件的第一边缘固联于驱动轴以随驱动轴移动，在清洁作用力F1施加于近端时，下弹性件的第一边缘所在位置的驱动轴沿与第一方向相反的第二方向产生第二位移；传感装置，传感装置包括固定部件和可动部件，其中可动装置设置在驱动部上，在清洁作用力F1施加于近端时，可动部件相对固定部件沿第二方向产生第三位移，当清洁作用力F1超出最大压力F1 M时，可动部件相对固定部件的位移使压力报警机构的警报装置产生警报指示。
根据本发明的另一较佳方面，近端弹性件和远端弹性件分别具有与第一边缘相对的第二边缘，第二边缘构成近端弹性件和远端弹性件弹性变形时的固定边缘，其中近端弹性件和远端弹性件各自沿纵轴线的宽度的中心线之间的距离至少为3.5mm。所述近端弹性件的平面相对所述中位平面(P)形成第一角度，所述远端弹性件的平面相对所述中位平面形成第二角度第一角度和第二角度大于等于10度且小于等于90度。
根据本发明的另一较佳方面，纵轴线延伸通过一中位平面，并且中位平面基本垂直于清洁作用力，近端弹性件的平面相对中位平面P形成第一角度，远端弹性件的平面相对中位平面形成第二角度，其中第一角度和第二角度大于等于10度且小于等于90度，其中近端弹性件和远端弹性件位于中位平面的相对两侧上或者位于中位平面的同一侧上，并且近端弹性件和远端弹性件位于清洁作用力方向和纵轴线所在平面的相对两侧上或者沿着清洁作用力方向。
根据本发明的另一较佳方面，驱动部包括磁铁和机架，磁铁通过机架附连到驱动轴的远端，可动部件相比驱动轴的近端更远离近端弹性件。
根据本发明的另一较佳方面，传感装置的固定部件包括感应器件和发射源，感应器件和发射源固定之间形成间隙，可动部件包括可移动进入在感应器件和发射源之间间隙的阻挡块，其中感应器件和发射源包括电、磁和光感应器件和发射源中的至少一种。
根据本发明的另一较佳方面，感应器件和发射源设置在清洁护理用具的电路板或壳体上或相对于外壳固定的零件上。其中，相对于外壳固定的零件包括线路板和电池仓机架等。
根据本发明的另一较佳方面，压力报警机构包括压力限制部，压力限制部限制可动部件的移动范围，使感应器件最大压力F1 M在2.5N到15N的范围内，其中，最大压力限制部设置在清洁护理用具的外壳或相对于外壳固定的零件上。
此外，本发明还提供了一种清洁护理用具，清洁护理用具包括上述换能装置或包括上述压力报警机构，清洁护理用具包括电动牙刷、电动剃须刀、电动洁面器和电动沐浴器中的一种。
此外，根据本发明，驱动线圈被布置成相对于所述清洁护理用具的外壳无相对运动，并且所述驱动线圈布置在所述磁铁产生的磁场中，所述磁铁产生的磁力线和驱动线圈中的电流I方向之间夹角约为90度，驱动线圈中通过频率为f 0的交变电流I，由此所述驱动线圈和所述磁铁相互作用产生以驱动轴纵轴线为轴线的往复力偶，往复力偶驱动所述换能器谐振。
此外，在根据本发明的清洁护理用具中，换能器和清洁护理用具的清洁组件组成谐振体，所述驱动线圈和所述磁铁相互作用产生以驱动轴纵轴线L2为轴线的往复力偶，所述往复力偶驱动所述谐振体作谐振，所述谐振体的固有频率fn介于所述往复力偶的频率f0的85％和115％之间。
采用了根据本发明的换能装置，解决了弹性件易疲劳而屈服的问题，提高了换能装置的使用寿命，实现了个人清洁护理用具的小型化，并且组装方便、转动平稳、噪音小、阻尼低且安全可靠。此外，利于压力报警机构可以识别施加于清洁元件上的压力大小。
附图说明
为了更完全理解本发明，可参考结合附图来考虑示例性实施例的下述描述，附图中：
图1为根据本发明第一较佳实施例的个人清洁护理用具和内部机芯的立体图；
图2为图1所示清洁护理用具的包括换能装置的内部机芯的分解图；
图3为根据本发明第一较佳实施例的换能装置的立体图；
图4为根据本发明第一较佳实施例的换能装置的立体图，其中示出了换能装置中的弹性组件；
图5示出了适用于根据本发明第一实施例的两种第一弹性件和驱动轴；
图6示出了适用于根据本发明第一实施例的换能器的两种第一弹性件；
图7为示出了清洁元件和第一弹性件和第二弹性件的位置关系的示意性端视图；
图8示出了根据本发明较佳实施例的沿着纵轴线的弹性件和清洁组件的受力简图；
图9为根据本发明第一实施例的换能装置和线路板的仰视立体图；
图10示出根据本发明第二较佳实施例的换能装置的立体图；
图11为图10中的换能装置的另一立体图，其中示出了驱动线圈；
图12为根据本发明第三实施例的换能装置的立体图；
图13为图12所示的换能装置的另一立体图，其中驱动线圈被移除；
图14为根据本发明第四实施例的换能装置的立体图；
图15为图14所示的根据本发明第四实施例的换能装置中驱动轴、弹性件和磁铁的组合的示意图；
图16为图15所示的根据本发明第四较佳实施例的换能装置中的弹性件示意图；以及
图17为根据本发明第四较佳实施例的换能装置的支架、弹性件与清洁元件的关系图。
附图标记列表
1  手柄
2  清洁元件载体
3  清洁元件
4  线路板
5  电池
7、7’  换能器
101  驱动轴
102  第一磁铁
103  第二磁铁
104  第一弹性件
104A  第一弹性件
104B  第一弹性件
105  第二弹性件
105A  近端第二弹性件
105B  远端第二弹性件
106  第一弹性件的边缘
107  第一弹性件的边缘
108  第二弹性件的边缘
109  第二弹性件的边缘
110  换能器机架
111  机架凸起
112  包络驱动轴的换能器机架部分
113  机架紧固臂
114  机架随动块
115  支承臂
121  第一驱动线圈
122  第二驱动线圈
131  换能器上壳
132  换能器下壳
133  紧固螺丝
134  驱动线圈架
135  电池仓
202  磁铁
203  磁铁
221  驱动线圈
204A，204B  第一弹性件
302  圆柱形磁铁
321、322、323、324  驱动线圈
401  光敏元件
402  光源
501  驱动轴
502  第一磁铁
503  第二磁铁
505A  近端弹性件
505B  远端弹性件
508  弹性件的边缘
509  弹性件的边缘
510  换能器机架
511  机架凸起
512  包络驱动轴的换能器机架部分
513  机架紧固臂
L1  清洁元件的纵轴线
L2  驱动轴的纵轴线
L3  近端第二弹性件的中心线
L4  远端第二弹性件的中心线
L5  近端弹性件的中心线
L6  远端弹性件的中心线
α1、α2、α3、α4  第二弹性件平面和清洁元件的纵轴线的角度
β1、β2、β3、β4  第一弹性件平面和清洁元件的纵轴线的角度
δ1、δ2、δ3、δ4  弹性件平面和清洁元件的纵轴线的角度
具体实施方式
下面结合具体实施例和附图对本发明作进一步说明，在以下的描述中阐述了更多的细节以便于充分理解本发明，但是本发明显然能够以多种不同于此描述的其它方式来实施，本领域技术人员可以在不违背本发明内涵的情况下根据实际应用情况作类似推广、演绎，因此不应以此具体实施例的内容限制本发明的保护范围。
下文以电动牙刷作为个人清洁护理用具的典型例子，并结合附图更详细地描述本发明的示例性实施例。虽然下面仅以电动牙刷为例进行解释说明，但本发明不限于此。本发明也可适用于电动剃须刀、电动洁面器、电动沐浴器等能够通过换能器提供清洁动作的清洁护理用具。
为了清楚起见，在本说明书中采用了表述空间相对位置的词语如“上”、“下”、“左”、“右”、“近端”、“远端”等来简单描述如图所示的一个元件或特征与另一元件(一或多个)或特征(一或多个)的相互关系，其中，驱动线圈纵轴线方向是指平行于驱动线圈流过电流I时铁芯内部产生的磁力线方向；“上”、“下”、是相对于驱动轴纵轴线而言的，面向相应视图沿平行于驱动轴纵轴线的向上方向定义为“上”，沿平行于驱动轴纵轴线的向下方向定义为“下”；“左”和“右”是相对于驱动轴纵轴线而言的，面向相应视图沿垂直于驱动轴纵轴线的方向在驱动轴纵轴线的左侧定义为“左”，其右侧定义为“右”；“近端/近侧”指靠近清洁护理用具使用时清洁作用力作用位置的端部或侧部；“远端/远侧”指远离清洁护理用具使用时接近清洁作用力作用位置的端部或侧部。
此外，本申请中使用的词汇“和/或”包括所列出的一或多个相关联的词汇中的任一个和所有组合。
尽管本说明书中使用了词语“第一”等来描述多个元件或构成部分，这些元件或构成部分不应受这些词语的限制。这些词语仅用于区分一个元件或构成部分和另一元件或构成部分，而不包含“顺序”。因此，将下面讨论的那些元件或构成部分的序数词相互变换也没有超出本发明的构思和范围。
图1和图2分别示出了根据本发明第一较佳实施例的清洁护理用具的立体图和分解立体图。以下描述清洁护理用具以电动牙刷为例。电动牙刷主要包括手柄1和可拆卸地安装在手柄1上的清洁组件。手柄1包括手柄外壳以及安装在手柄外壳中的各功能部件。电动牙刷的清洁组件呈牙刷头的形式，其包括清洁元件载体2和分布在清洁元件载体2上的清洁元件3。牙刷头的载体2例如以卡扣联接方式安装到手柄1上，卡扣联接可以使驱动手柄1和清洁组件可靠地联接在一起，也可以方便地分离驱动手柄1和清洁组件。清洁元件3可以是如刷毛之类的物件。
清洁护理用具的手柄1中的功能部件主要包括电源部分、控制部分、触发部分和换能装置。通常电源部分包括安装在电池仓135内的充电电池5和充电 电路，用以向用具的各个部分提供电力；控制部件主要包括线路板4，用以控制电动牙刷的各种工作模式以及电动牙刷的开启或关闭等；触发部分包括开关，用以启动和关闭电动牙刷的运转；换能装置被构造成将输入的电能转换为提供清洁组件往复运动的机械能。
图2、图3和图4示出了根据本发明第一实施例的换能装置。该换能装置主要包括换能器7，换能装置的驱动线圈相对换能器7布置。换能器7主要包括换能器机架110、第一磁铁102、第二磁铁103、可拆卸装配清洁组件的驱动轴101以及用于引起谐振运动的弹性组件。
较佳地，换能器机架110的材料为塑料，在第一实施例中，作为换能器7的一部分的第一磁铁102、第二磁铁103通过胶水、螺丝或注塑之类的手段与换能器机架110的远离清洁元件3的远端固联在一起，从而使得磁铁102、103成为换能器7的整体的一部分。
较佳地，换能装置还包括换能器上壳131和换能器下壳132，它们例如通过紧固螺丝133紧固在一起，从而将换能器机架110的机架紧固臂113压紧在两个壳体之间，并相应锁紧换能器机架110。换能器上壳131和换能器下壳132则进一步紧固到用具的外壳。但应当理解，在其他替代实施例中，换能器上壳和下壳也可以是与手柄外壳一体化的一部分。
在第一较佳实施例中，如图4所示，换能器7的弹性组件包括四个第一弹性件104和四个第二弹性件105。更具体地，如图4所示，沿着驱动轴101，弹性组件从近端到远端依次包括两个第一弹性件104A、两个第二弹性件(近端弹性件)105A、两个第二弹性件(远端弹性件)105B、以及两个第一弹性件104B。
第一弹性件104A和104B中的每一个均大致为长方体。从第一弹性件104A和104B在机架紧固臂113到换能器机架部分112的距离为弹性件长度，第一弹性件104A和104B沿着驱动轴纵轴线L2方向的距离被称为弹性件宽度，长方体余下的另一边长为弹性件厚度，由第一弹性件104A和104B各自的长和宽构成的平面为弹性件平面。类似地，每一个第二弹性件105大致为长方体，从第二弹性件105A和105B在机架紧固臂113的机架凸起111到换能器机架部分112的距离为弹性件的长度，第二弹性件105A和105B沿着驱动轴纵轴线方向的距离为弹性件的宽度，长方体的另一边长为弹性件的厚度。由第二弹性件105A和105B的长和宽构成的平面为弹性件平面。
如图7所示，四个第一弹性件104A和104B位于同一个平面中，它们处于换能装置的中位平面P中。对于根据本发明的换能装置，中位平面P被定义为垂直于清洁作用力F1方向并且驱动轴纵轴线L2所在的平面，清洁作用力F1和驱动轴纵轴线L2垂直。在电动牙刷中，清洁作用力F1的方向定义为清洁元件3的纵轴线L1所在方向，也就是说，中位平面P基本垂直于清洁元件3的纵轴线L1。由于第一弹性件104处于中位平面P中，因此，第一弹性件104的平面与驱动轴纵轴线L2的角度为0度。更具体地，在第一实施例中，第一弹性件104A和104B的弹性件平面和清洁元件的纵轴线L1的角度分别为β1、β2、β3、β4，如图7所示本实施例中β1、β2、β3、β4都等于90度，清洁元件的纵轴线L1垂直于第一弹性件平面。但在其他替代实施例中，角度β1、β2、β3、β4也可以取其他不同的值。
进一步地，弹性组件的第二弹性件105包括近端弹性件105A和远端弹性件105B是成对布置的，两对弹性件沿纵轴线L2偏置布置。近端弹性件105A靠近驱动轴101的近端，而远端弹性件105B则更靠近驱动轴101的远端。第二弹性件105平面为连接机架凸起111和包络驱动轴的换能器机架部分112的平面，较佳地，该平面和纵轴线L2所在的中位平面之间角度大于30度，并且较佳地该平面和纵轴线L2的夹角小于30度。
与第一弹性件104A和104B位于中位平面P中的布置方式不同，四个第二弹性件105均相对于中位平面P成角度的布置，换言之，四个第二弹性件105相对于和清洁元件3的纵轴线L1和纵轴线L2所在平面的成角度布置。近端弹性件105A和远端弹性件105B分别在中位平面P相对的两侧上倾斜布置，如图7所示，近端弹性件105A位于中位平面P的上侧面相对中位平面P成角度布置，而远端弹性件105B位于中位平面P的下侧相对中位平面P成角度布置。
如图7所示，四个第二弹性件105A和105B相对纵轴线L1分别为α1、α2、α3、α4，为了避免由于弹性件屈服导致换能器换效，角度α1、α2、α3、α4小于等于80度且大于等于0度，更佳地，角度α1、α2、α3、α4小于等于60度且大于等于0度。在如图7所示的第一实施例中，角度α1、α2、α3、α4都等于60度。换言之，四个第二弹性件105A和105B的平面与中位平面P之间的角度大于等于10度且小于等于90度，更佳地，第二弹性件105A和105B的平面与中位平面P之间的角度大于30度且小于等于90度。在图7所示的实施例中，第二弹性件105A和105B的平面与中位平面P之间的角 度均为30度。应当理解，在其他替代实施例中，角度α1、α2、α3、α4还可以取不同的值。
在第一实施例中，第一弹性件104和第二弹性件105均通过换能器机架110固定。具体地，如图4所示，换能器机架110包括包络驱动轴的换能器机架部分112和径向远离换能器机架部分112设置的两个机架紧固臂113。其中机架紧固臂113在纵轴线L2的相对两侧成对设置。
成对的第一弹性件104的边缘106分别固联到两个机架紧固臂113，第一弹性件104的另一边缘107固联于包络驱动轴的换能器机架部分112，基本对应于纵轴线L2的位置，第一弹性件104A和104B在机架紧固臂113和邻近纵轴线L2的换能器机架部分112之间延伸。
类似地，第二弹性件105A和第二弹性件105B的边缘109分别固联到包络驱动轴的换能器机架部分112，而相对的边缘108固联到机架紧固臂113。为了实现第二弹性件105A和105B的相对中位平面P的成角度布置，机架凸起111从机架紧固臂113相对两侧面凸起。机架凸起111为机架紧固臂113的一部分，因此，机架凸起111也可以理解为换能器机架110的一部分。第二弹性件105的边缘108分别固定到一个相应的机架凸起111上。
在其他替代实施例中，也可以不设置机架凸起111，例如，可以通过加厚机架紧固臂113来取代机架凸起111。
沿着驱动轴纵轴线L2错位分布的两个第一弹性件104A和两个第一弹性件104B的材料均为金属。如图5和图6所示，沿着驱动轴纵轴线L2分布的两个第一弹性件104A和104B可以组成一个整体的第一弹性件组件，该组件从一整片金属片材上冲压成形，或者，也可以是由两个各自包含了一个弹性件204A和一个弹性件204B的弹性件组件形成。在其他替代实施例中，也可以包括四个独立的弹性件组合成第一弹性件组件。上述各种第一弹性件的组件依然可以被认为，由沿着驱动轴纵轴线L2分布的两个独立的第一弹性件104A、沿着驱动轴纵轴线L2分布的两个独立的第一远端弹性件104B组成。
更具体地，可以认为近端弹性件可包括两个独立的第二弹性件105A，而远端弹性件包括两个独立的第二弹性件105B。如图4所示，换能器机架110上分布有四个机架凸起111，四个机架凸起111各自固联对应的第二弹性件105A和105B的另一边缘108，第二弹性件105A和105B的另一边缘109固联于包络驱动轴的换能器机架部分112，这样第二弹性件105A和105B在机架凸 起111和包络驱动轴的换能器机架部分112之间延伸。
如图2、图3、图4所示，换能器7的第一磁铁102、第二磁铁103对称分布于驱动轴纵轴线L2的上侧和下侧(和下面的左右不匹配，浦：磁铁上下布置，驱动线圈左右布置)，即分别位于中位平面P的上方和下方。第一驱动线圈121和第二驱动线圈122分别位于驱动轴纵轴线L2的左右两侧，第一驱动线圈121和第二驱动线圈122相对手柄外壳固定布置，这样驱动线圈121和122相对手柄外壳没有相对运动。第一磁铁102、第二磁铁103的磁极朝向第一驱动线圈121或第二驱动线圈122，朝向同一驱动线圈121或122的第一磁铁102、第二磁铁103具有相反的磁极，如图4所示，朝向第二驱动线圈122的第一磁铁102磁极为S极，朝向第二驱动线圈122的第二磁铁103磁极为N极。第一驱动线圈121和第二驱动线圈122中的电流I方向垂直于第一磁铁102、第二磁铁103内部的磁力线方向。
下面结合根据本发明第一实施例的换能装置进行运动分析。
参见图1至4，使用者触发电动牙刷的开关按钮启动电动牙刷，手柄1中的线路板4启动驱动线圈121、122，第一驱动线圈121和第二驱动线圈122通过频率为f0的交变电流I，第一驱动线圈121中的电流I方向相反于第二驱动线圈122中的电流I方向，如果第一驱动线圈121中的电流I方向为顺时针方向，则第二驱动线圈122中的电流I方向为逆时针方向。朝向同一驱动线圈的第一磁铁102、第二磁铁103具有相反的磁极。第一驱动线圈121和第二驱动线圈122和手柄外壳没有相对运动。第一磁铁102和第二磁铁103形成的磁场和通电的第一驱动线圈121和第二驱动线圈122相互作用产生电磁力。第一磁铁102和第二磁铁103上受到的电磁力大小相等且方向相反，换能器7上受到平衡的电磁力，但是由于第一磁铁102和第二磁铁103分别分布于驱动轴纵轴线L2的上下侧，电磁力在换能器7上形成电磁转矩M1。由于流过第一驱动线圈121和第二驱动线圈122的电流I是交变的，换能器7上的电磁转矩M1的方向相应地也是交变的,换能器7承受来自驱动线圈121、122的往复力偶。这样，驱动轴纵轴线L2两侧都有电磁力，而弹性件104和105为承受电磁力的主要部件。假设在初始状态下，换能器的电磁转矩M1的方向为逆时针方向。换能器的电磁转矩M1使弹性件104A和104B和第二弹性件105A和105B产生弯曲弹性变形，此时，第一弹性件104A和104B固联机架紧固臂113的边缘为固定端或静止端。为了第一弹性件104在电磁力矩M1的作用下以往复弯曲弹 性变形使换能器7和清洁组件做谐振运动，第一弹性件104A和104B的弹性件平面和中位平面P之间的角度小于30度。第二弹性件105A和105B同样也在电磁力矩M1的作用下以往复弯曲弹性变形，使换能器7和清洁组件做谐振运动。这样，第二弹性件105A和105B固联于驱动轴101的边缘109作为弹性变形的可动端或谐振端，而第二弹性件105A和105B固联于机架凸起111的边缘108作为弹性变形的固定端或静止端。
在第一实施例中，弹性件104A和104B的材料为金属或主要由金属构成，第二弹性件105A的材料可以为塑料也可以是金属，第二弹性件105B的材料为塑料或主要由塑料构件。本发明中，为了叙述方便，通常指出弹性件为金属或塑料，但应当理解，弹性件可以为金属加塑料的复合体。当该弹性件的劲度系数的60％以上来自金属，则称该弹性件主要由金属构成；当该弹性件的劲度系数的60％以上来自塑料，则称该弹性件主要由塑料构成。当金属和塑料贡献的劲度系数都没有大于该弹性件的劲度系数的60％时，该弹性件为金属和塑料复合体。
在第二弹性件105的材料为塑料或主要由塑料构成，如图4所示，第二弹性件105A和105B的宽度设置为比第一弹性件104A和104B的宽度大。
下面以弹性件材料105A和105B都为塑料为例进行分析。
按照固体力学原理，在弯曲弹性变形状态下，弹性件等效为线性弹簧，以长方体弹性件为例，弹性件等效的线性弹簧劲度系数为：
K＝3*E*I z/(a 3),
其中E为材料的弹性模量，I z为和驱动力或驱动力矩对应的弹性件惯性矩，a为驱动力在弹性件的作用点到该弹性件相对于手柄外壳静止的弹性件104的边缘106或弹性件105的边缘108的距离。第一弹性件104A和104B的a为第一弹性件a 1,第二弹性件105A和105B的a为第二弹性件a 2。第一弹性件104A和104B对应的弹簧劲度系数为第一弹性件劲度系数K 1，第二弹性件105A和105B对应的弹簧劲度系数为第二弹性件劲度系数K 2。
在第一实施例中，较佳地，第一弹性件104A和104B材料的弹性模量E 1大于第二弹性件105A和105B材料的弹性模量E 2的20倍。如第一弹性件104A和104B的材料是不锈钢，弹性模量E 1为196Gpa,第二弹性件105A和105B的材料是POM，弹性模量E 2为2.5Gpa。第一弹性件104A和104B相对于电磁转矩M1的惯性矩为第一弹性件惯性矩I Z1，第二弹性件105A和105B相对于电磁转 矩M1的惯性矩为第二弹性件惯性矩I Z2。按固体力学可知，长方体的惯性矩为：
I Z＝b*h*h*h/12,
其中b为对应上述弹性件的宽度，h为对应上述弹性件的厚度。在第一实施例中，较佳地，第一弹性件104A和104B惯性矩I Z1中的b为1.3mm,第二弹性件105A和105B惯性矩I Z2中的b为3.5mm,第一弹性件104A和104B惯性矩I Z1中的h为0.16mm，第二弹性件105A和105B惯性矩I Z2中的h为0.3mm。参考图7左上角的第二弹性件105B和图7左边的第一弹性件104B，第二弹性件a 2*cos(β 1-α 1)大于等于第一弹性件a 1。在第一实施例中，β 1为90度，α 1为60度。显然，第一弹性件平面相对于清洁元件纵轴线L1的角度为角度β。第二弹性件平面相对于清洁元件的纵轴线的角度为角度α，角度β1大于角度α1，第一弹性件的边缘107固联包络驱动轴的换能器机架部分112，第一弹性件的另一边缘106固联机架紧固臂113，第二弹性件的边缘109固联包络驱动轴的换能器机架部分112，第二弹性件的另端固联机架凸起111，从而保证第二弹性件的a 2大于第一弹性件a 1。经过计算，第一弹性件的E 1*I z1/(a 1 3)大于第二弹性件的E 2*I z2/(a 2 3)的6.8倍，即第一弹性件劲度系数K 1大于第二弹性件劲度系数K 2的6.8倍。在第一实施例中，换能器7和清洁组件组成的振动体的相对于驱动轴纵轴线L2的等效质量为M m,该振动体的固有频率为f n，则
Figure PCTCN2022101744-appb-000001
其中K n为所有第一弹性件劲度系数之和加上所有第二弹性件劲度系数。第一弹性件劲度系数之和为K 1t,第二弹性件劲度系数之和为K 2t。
当驱动频率f 0在等于机械固有频率f n时，机械部分处于受迫共振运动。当驱动线圈通过频率为f0的交变电流I时，换能器7和清洁组件受到频率为f 0的电磁力,驱动力的频率f 0介于换能器7的固有频率f n的85％到115％之间。依照简谐振动原理，通常驱动力的频率f 0在机械固有频率f n的85％到115％之间时,可以认为机械部分处于受迫谐振运动，谐振运动和共振运动的电能转化为机械能效率很高。在换能器7和清洁组件的谐振运动中，弹性件由于材料内力的作用会消耗一部分能量，相当于材料内阻消耗能量，该部分能量以弹性件材料发热的现象表现出来，且弹性模量越小的材料内阻越大，材料温升越高。因此，第一弹性件104A和104B主要由金属构成，第一弹性件有较高的弹性模量，而第二弹性件105A和105B主要由塑料构成，第二弹性件105A和105B的弹性模量较小，金属材料的散热效果大大好于塑料材料的散热效果。在换能器7和清 洁组件的谐振运动中，第一弹性件104A和104B的温升大大低于第二弹性件105A和105B的温升。温度的升高会使弹性件材料的弹性模量下降，从而使弹性件的劲度系数变小。在第二弹性件105A和105B为塑料的实施例中，第一弹性件104A和104B的温升对第一弹性件劲度系数的影响有限，从而可以忽略，第二弹性件105A和105B的温升对第二弹性件劲度系数的影响较大，为了使换能器7和清洁组件在工作周期内始终处于谐振运动状态，综合上述各公式和原理分析，假设第二弹性件105A和105B的角度系数由于温升而降为零，当(K 1t+K 2t) 2/(K 1t) 2<1.15/0.85时，当K 1t>6.13K 2t时，换能器7和清洁组件在工作周期内始终处于谐振运动状态。换能器7和清洁组件固有频率中的弹簧劲度系数主要取决于第一弹性件104A和104B的劲度系数。在第一实施例中，所有第一弹性件劲度系数之和大于所有第二弹性件劲度系数之和的6.13倍，从而确保换能器在工作周期中始终处于高效的谐振状态。
在其他替代实施例中，近端弹性件105A的材料可以为金属或主要由金属构成，远端弹性件105B的材料为塑料或主要由塑料构成，并且所有第一弹性件劲度系数之和加上所有近端第二弹性件劲度系数之和，大于所有第二下弹性件劲度系数之和的6.13倍。在这种情况下，第一弹性件104A和104B的材料为金属，第二弹性件105B的材料为塑料，第一弹性件104A和104B的弹性模量是第二弹性件105B的弹性模量的20倍以上。第一弹性件平面相对于清洁元件纵轴线的角度为角度β。第二弹性件平面，相对于清洁元件的纵轴线的角度为角度α，角度β大于角度α。
图8示出了根据本发明较佳实施例的沿着纵轴线的弹性件和清洁组件的受力简图。如图8所示，施加于清洁元件3上的压力F1，第二弹性件105A上的等效力为F2以及第二弹性件105B上的等效力为F3。施加于清洁元件3上的压力F1大致平行于清洁元件纵轴线L1。本发明中，第二弹性件105A和105B平面，相对于清洁元件的纵轴线L1形成小于80度的角度α，具体为60度。当清洁元件3上施加压力F1时，第二弹性件105A和105B能产生平行于清洁元件纵轴线L1的分力，由于第二弹性件105A和105B的边缘109固联于换能器机架部分112，而另一边缘108固联机架凸起111，按照力矩平衡和力的平衡原则，第二弹性件105A上的等效力F2的方向和压力F1的方向相反，第二弹性件105B上的等效力F3的方向和压力F1的方向相同，第二弹性件105A呈拉伸状态以产生等效力F2，第二弹性件105B呈拉伸状态以产生等效力F3。另外， 压力F1在垂直于第二弹性件105A和105B平面的分力，造成第二弹性件的压力弯曲变形，此压力弯曲变形会额外的增加第二弹性件的内部应力，有可能造成第二弹性件的屈服，从而造成换能器7的固有频率的剧烈变化，而使换能器失效。本发明中，角度α小于80度，且大于等于0度。更加优选地，角度α小于等于60度，且大于等于0度，从而有效降低压力F1在垂直于第二弹性件105A和105B平面的分力，从而降低压力F1造成的第二弹性件105A和105B的压力弯曲变形。
重要的，发明人发现,第二弹性件105A上的等效力F2和第二弹性件105B上的等效力F3之间的距离对力矩平衡尤为重要，经过大量实验，结合生产工艺的可行性，在沿着驱动轴纵轴线L2方向上，第二弹性件105A的中心线L3距离至少一个第二弹性件105B的中心线L4为3.5mm以上，中心线为位于第二弹性件105A和105B平面上且从机架凸起111指向包络驱动轴的换能器机架部分112的第二弹性件平面中心线,也可以理解为，中心线为位于第二弹性件105A和105B平面上且从换能器机架110指向包络驱动轴的换能器机架部分112的第二弹性件平面中心线。由于至少一个近端第二弹性件的中心线L3距离至少一个远端第二弹性件的中心线L4为3.5mm以上，相对于只有一个第二弹性件105A，更能避免清洁元件3上的压力F1对第二弹性件105造成的扭转变形，而避免第二弹性件的过大应力，从而避免换能器7的失效。
继续参考图8、图9、图10，本发明中，利用第二弹性件105A和第二弹性件105B材料的拉伸或压缩能够平衡清洁元件压力F1以及清洁元件压力F1产生的力矩M F。近端的第二弹性件105A对应在驱动轴101上的力的作用点为O1点，清洁元件压力F1产生的力矩M F，是清洁元件压力F1相对于O1点形成的力矩，力矩M F的方向为顺时针方向。按照图8中的受力分析和力矩平衡，第二弹性件105A和第二弹性件105B材料被拉伸，第二弹性件105A被拉伸的距离为Y 1,第二弹性件105B材料被拉伸的距离为Y 2。按照虎克定律，Y 2正比与(F3/E),第二弹性件105B上的等效力F3具有平衡力矩M F的作用，而E为第二弹性件105B材料的弹性模量。在本发明中，第二弹性件105B材料为塑料，第一弹性件104的材料为金属，第一弹性件104材料的弹性模量是第二弹性件105B材料的弹性模量的二十倍以上。由于本发明中，创造性地引入塑料第二弹性件105B，按照Y 2正比与(F3/E)，在相同的F3的条件下，在相同的清洁元件压力F1下，塑料的第二弹性件105B对比于金属的第二弹性件105B，能产生大20倍以上的第 二弹性件105B材料被拉伸的距离Y 2。
在其他替代实施例中，可以把第二弹性件105A和105B绕驱动轴纵轴线L2旋转180度，则Y 2变为第二弹性件105B材料被压缩距离，因此，Y 2为第二弹性件105B材料被拉伸或压缩的距离。
有利地，基于近端弹性件105A、远端弹性件105B以及换能器机架的驱动轴能够构成用于电动牙刷的压力报警机构，其构造成在刷头上施加的清洁作用力超过预定值时发出警报。压力报警机构包括传感装置，传感装置包括至少一个可动部件，该可动部件设置在驱动轴远端的磁铁上或者换能器机架上，较佳地，沿纵轴线L2设置在磁铁的远端或者换能器机架的远端，在清洁作用力F1施加于近端时，该可动部件沿第二方向产生第三位移Y 3，当所述清洁作用力F1超出最大压力F1 M时，可动部件的移位使压力报警机构的警报装置产生警报指示。
结合图8的示例，第二弹性件105B及该处于该位置的驱动轴部分在清洁元件压力F1的作用下，会产生和清洁元件压力F1方向相反的位移Y 2。相对于第二弹性件105A更加远离清洁元件3的换能器机架110部分和磁铁，在清洁元件压力F1的作用下，产生和清洁元件压力F1方向相反的位移Y 3。由于第二弹性件105B和第二弹性件105A被固联在包络驱动轴的换能器机架部分112上，位移Y 3和位移Y 2成正比关系。
在第一实施例中，如图4所示，可动部件包括在换能器机架110远离清洁元件3的尾部布置的机架随动块114，机架随动块114呈凸起形状，在清洁元件压力F1的作用下，第二弹性件105B处于弹性变形状态，机架随动块114产生与清洁元件压力F1方向相反的位移Y 3，位移Y 3随着清洁元件压力F1的增大而变大。线路板4在临近机架随动块114的两侧分别布置有作为传感装置的诸如LED光源402和光敏器件401，在光敏器件401接受到的光通量发生变化时，光敏器件401的等效电阻也产生相应的变化，线路板4通过对光敏器件401等效电阻大小的检测来感知压力F1的变化。当使用者加大施加于清洁元件3上的压力F1时，机架随动块114的位移Y 3变大，机架随动块114更加进入光源402和光敏器件401之间的间隙，光敏器件401得到的来自光源402的光通量随之减少，光敏器件401等效电阻变大，线路板4检测到光敏器件401等效电阻的变大，实现对清洁元件压力F1变大的识别，当清洁元件压力F1大小达到预设的阀值时，电动牙刷可以以声、光、振动等方式提醒使用者清洁元件上的 压力F1过大，提醒使用者降低施加在清洁元件上的压力F1。同理，使用者降低施加于清洁元件3上压力F1时，机架随动块114的位移Y 3变小，机架随动块114减少介于光源402和光敏器件401之间的间隙，光敏器件401所能获得的来自光源402的光通量随之变大，光敏器件401等效电阻变小，线路板4检测到光敏器件401等效电阻的变小，实现对清洁元件压力F1变大的识别，当清洁元件压力F1小于预设的压力过大的阀值时，电动牙刷退出声、光、振动等方式的提醒。
在根据本发明的实施例中，由于引入塑料的或主要由塑料构成的下第二弹性件105B，从而有效放大了位移Y 3,即有效放大了相对于第二弹性件105A更加远离清洁元件3的换能器机架110部分和磁铁在清洁元件压力F1的作用下产生的与清洁元件压力F1方向相反的位移。
报警机构的实施例可以作适当变形，比如可在机架随动块114上设置一个通孔，当清洁元件压力F1为零时，光源402的光没有或少量通过机架随动块114的通孔而入射到光敏器件401的感光面上，且机架随动块114的其余部分挡住光源402的光入射到光敏器件401的感光面上，此时，光敏器件401的等效电阻较大。当清洁元件压力F1变大时，LED402的光更多的通过机架随动块114的通孔而入射到光敏器件401的感光面上，此时，光敏器件401的等效电阻变小，从而实现线路板4对清洁元件压力F1大小的检测。
上述实施例中机架随动块114为相对于磁铁表面凸起的形状，当然，机架随动块114可以为凹入形状、平面形状或曲面形状，利用其中的某一个面的位移Y 3，使随动块114的至少一个面接近或远离光敏器件401，使光敏器件401能接收来自光源402光的入射角发生变化，从而使光敏器件401上的光通量随着清洁元件压力F1的单调变化而单调变化。
还可以将磁铁作为传感装置的可动部件，利用远离清洁元件的磁铁的位移Y 3，在线路板4上安装磁场感应器件如霍尔元件或线圈，磁铁的位移Y 3造成在磁场感应器件上磁场强度的变化，从而形成磁场感应器件的电压值的变化，从而实现线路板4对清洁元件压力F1大小的检测。
此外，较佳地，换能装置被设定具备启动压力F4。具体地，可以在比第二弹性件105A更加远离清洁元件的换能器机架110部分和磁铁上安装弹簧进行预紧，只有在清洁元件压力F1大于清洁元件启动压力F4时，近端第二弹性件和远端第二弹性件才能产生位移Y 2和位移Y 3。
由于压力F1的变大，会使关于弹性件的力的F2、F3变大，变大的F2、F3会使第二弹性件屈服而失去弹性。本发明中，换能装置还具备使压力F1被限制在最大压力F1 M的最大压力限制部，即换能装置构造成具有最大压力F1 M。在图9实施例中，线路板上开有一个通孔403，通孔403可以允许机架随动块114通过而接触到手柄外壳。当清洁元件3上的压力F1大于等于清洁元件最大压力F1 M时，机架随动块114接触手柄外壳，手柄外壳构成了最大压力限制部，其限制了机架随动块114的进一步移动，位移Y 2和位移Y 3不再变大，从而保证第二弹性件始终处于弹性变形的范围内。只有当压力F1小于最大压力F1 M且大于清洁元件启动压力F4时，随着压力F1的单调变化，位移Y 2和位移Y 3单调变化。
对于电动牙刷，较佳地，清洁元件最大压力F1 M的范围是2.5N到10N，清洁元件启动压力F4大于等于0N且小于等于2N。随着清洁元件上压力F1超过清洁元件最大压力F1 M而继续单调增大时，手柄外壳或相对于手柄外壳静止的零件，约束换能器7，使位移Y 2和位移Y 3不再单调变化。
基于上文中的谐振分析和力学分析，清洁元件3上的压力F1会造成第一弹性件104A和104B额外的弯曲变形，但是，由于本发明引入第二弹性件105A和105B来平衡清洁元件3上的压力F1引起的力和力矩，大大减少了清洁元件3上的压力F1造成的第一弹性件104A和104B额外的弯曲变形，从而使换能器7能长寿命地工作在谐振状态下，且第二远端弹性件105B对换能器的固有频率中的弹簧劲度系数影响有限，使换能器7的频率调节变得容易。第一弹性件104A和104B和第二弹性件105A和105B可以通过注塑工艺完成，换能器7易于制造。
作为第一实施例的一种变形例，也可以只有一个第一弹性件，如只有一个图4中位于驱动轴左边的上方第一弹性件104A，或只有一个图4中位于驱动轴右边的下方第一弹性件104B，一个第一弹性件依旧可以满足上述对第一弹性件组合的要求，一个第一弹性件依旧能实现本发明的目的。
作为第一实施例的另一种变形例，也可以只有两个第二弹性件，两个第二弹性件包括一个第二弹性件105A和一个第二弹性件105B，如只有一个图4中位于驱动轴左边的第二弹性件105A，只有一个图4中位于驱动轴右边的第二弹性件105B，两个第二弹性件分别位中位平面P的两侧上同时也分别位于垂直于中位平面P且包括纵轴线L2的垂直平面的两侧上。一个第二弹性件105A和一 个第二弹性件105B的弹性组件依旧可以满足本发明对第二弹性件组合的要求，且能实现本发明的目的。
在其他变化形式，第二弹性件可以位于中位平面P同一侧，或者也可位于垂直于中位平面P且包括纵轴线L2的垂直平面的同一侧上。
图10和图11示出了根据本发明的第二实施例的换能装置的立体图，其中换能装置的磁铁线圈机构与第一实施例中的磁铁线圈机构具有不同的结构。如图10、图11，驱动线圈221相对于驱动轴纵轴线L2居中布置，磁铁202和203分别分布在驱动线圈221的两侧，换能器机架110以驱动轴纵轴线L2为中心向两侧以及再向下延伸形成两个支承臂115，两个磁铁分别紧固在各自的支承臂115上，磁铁形成的磁场穿越驱动线圈，通过类似于上面的分析，如图10、图11所示的磁铁202、203和驱动线圈221的布置，依旧能实现本发明的目的。
图12和图13示出了根据本发明第三实施例的换能器的立体图。如参考图12、图13，一个中空的圆柱体磁铁302紧固在驱动轴101上，驱动线圈321、322、323、324环绕布置在中空的圆柱体磁铁的外侧四周，磁铁形成的磁场穿越驱动线圈，通过类似于上面的分析，如图12、图13所示的磁铁和驱动线圈的布置，依旧能实现本发明的目的。
当然，磁铁和驱动线圈与弹性件相对清洁元件3的位置可以变化，例如磁铁和驱动线圈更靠近清洁元件3，或者磁铁和驱动线圈介于两个第二弹性件之间。
在现有的清洁用具的换能装置中，弹性件的固定端或静止端位于驱动轴纵轴线上，a cn为驱动力到驱动轴纵轴线的距离也是弹性件劲度系数计算公式中的a，而驱动力的力偶为驱动力乘以a cn,以及维持较小的驱动力而保证足够的力偶，a cn要足够大。为了维持弹性件的劲度系数合适的大小，弹性件的尺寸要略大。又由于弹性件的另外一端要固联于换能器传动臂上，因此，现有的换能装置都具有较大的尺寸。
在本实施例中，由此，第一弹性件104承受驱动轴上的电磁转矩M1。换能器机架110上分布有两个机架紧固臂113，两个机架紧固臂113各自固联对应的第一弹性件104A和104B的另一边缘106，第一弹性件104A和104B的边缘107固联于换能器机架部分112，包络驱动轴的换能器机架部分112包络部分驱动轴110，第一弹性件104A和104B在机架紧固臂113和包络驱动轴的换能器机架部分112之间延伸。驱动轴纵轴线L2到第一弹性件的边缘106的距离 是弹性件劲度系数计算公式中的a。驱动轴纵轴线L2到第一弹性件的另一端106的距离和电磁力偶M1的力臂无直接的关系，因此，驱动轴纵轴线L2到第一弹性件的边缘106的距离可以足够小，弹性件的尺寸可以更小，换能器7的整体尺寸可以更小，从而实现清洁器件的小型化。
在第一实施例中，在换能器7处于谐振状态下，采用第二弹性件105A和塑料第二弹性件105B沿着驱动轴纵轴线L2的错位分布，实现对清洁元件压力F1引起的位移Y 3的放大，从而实现对清洁元件压力F1的检测。对清洁元件压力F1的检测，在一些清洁用具中是需要的，比如在电动牙刷中，过大的清洁元件压力F1会伤害牙龈，因此有必要提醒使用者压力F1的大小。但另外一些应用中，清洁用具对实现清洁元件压力F1的检测需求不强烈，但希望换能器和清洁组件在谐振范围内，清洁元件上的压力F1能更大。为此，本发明提供了另一种方案，把上述的实施例中的所有第二弹性件的材料更换成金属，即，如图14、图15、图16、图17示出的换能装置的第四实施例。
在第四实施例中，换能器7’包括驱动轴501、沿着驱动轴纵轴线L2分布的沿着驱动轴纵轴线L2分布的两个近端弹性件505A、沿着驱动轴纵轴线L2分布的两个远端弹性件505B、磁铁502和磁铁503以及换能器机架510。两个磁铁502和503均固定到换能器机架510。换能器机架510的材料为塑料，驱动轴501、近端弹性件505A和远端弹性件505B通过换能器机架510联接在一起，磁铁502和503通过胶水或螺丝或注塑和换能器机架的远离清洁元件的尾部固联在一起。
在第四实施例中，换能器7’的弹性组件应当包括至少一个近端弹性件505A和一个远端弹性件505B，且一个第二近端弹性件505A和一个第二远端弹性件505B分别位于驱动轴纵轴线L2所在的中位平面P的相对两侧。分布在中位平面P两侧的一个近端弹性件505A和一个远端弹性件505B能够承受来自驱动轴纵轴线L2两侧的电磁力，从而使换能器受力平衡，而降低噪音和冲击。
在本发明的第四实施例中，换能器7’设置了两个近端弹性件505A和两个远端弹性件505B，近端弹性件505A和远端弹性件505B具有不同的倾斜角度并且沿纵轴线L2前后错开，其中近端弹性件505A相比远端弹性件505B更靠近驱动轴501的近端。
与第一实施例中的结构类似，换能器机架510包括包络驱动轴的机架部分512和机架紧固臂513，机架凸起511从机架紧固臂513处凸起。近端弹性件 505A、远端弹性件505B分别与机架凸起511以及包络驱动轴的机架部分512相互固联在一起。
如图15所示，换能器机架510上分布有四个机架凸起511，四个机架凸起511各自固联对应的弹性件505A和505B的边缘508，弹性件505A和505B的另一边缘509固联于包络驱动轴501的换能器机架部分512，弹性件505A和505B在机架凸起511和包络驱动轴的换能器机架部分512之间延伸。在其他替代实施例中，可以通过加厚机架紧固臂513来取代机架凸起511，而不影响本发明的实现。
弹性件505A和505B大致为长方体，从弹性件505A和505B在机架凸起511到包络驱动轴的换能器机架部分512的距离为弹性件的长度，弹性件505A和505B沿着驱动轴纵轴线方向的距离为弹性件的宽度，长方体的另一边长为弹性件的厚度。由弹性件505A和505B各自的长和宽构成的平面为弹性件平面。弹性件平面为连接机架凸起511和包络驱动轴的换能器机架部分512的平面，较佳地，该平面和驱动轴纵轴线L2的夹角小于30度。本实施例中，四个弹性件505A和505B平面和清洁元件的纵轴线L1的角度分别为δ1、δ2、δ3、δ4。本实施例中δ1、δ2、δ3、δ4都等于60度，换言之，弹性件505A和505B的平面与中位平面P的夹角为30度。应当理解，在其他替代实施例中，δ1、δ2、δ3、δ4可以取不同的值。
在第四实施例中，近端弹性件505A和远端弹性件505B的材料均为金属。弹性件505A和505B可以如图16所示，沿纵轴线形成相互独立的两个弹性本体，它们各自包括对称设置的两个弹性件，每一个独立的弹性本体在其中间部形成通孔以及位于两端的通孔，这些通孔用于使弹性本体固定到换能器机架上纵轴线。在其他替代实施例中也可以由四个独立的弹性件组合成弹性件组件。当然，换能器弹性件还可有其他设置方式，这些方式也将落入本发明的范围。
如图14所示，在换能器机架的远离清洁元件的尾部包络驱动轴501，磁铁502和503对称的分布于驱动轴纵轴线L2的两侧。第一驱动线圈和第二驱动线圈分别位于驱动轴纵轴线L2的两侧，第一驱动线圈和第二驱动线圈和手柄外壳没有相对运动。磁铁502、磁铁503在朝向同一驱动线圈的具有相反的磁极，比如，在朝向第二驱动线圈的磁铁502磁极为S极，在朝向第二驱动线圈的磁铁503磁极为N极。第一驱动线圈和第二驱动线圈中的电流I方向垂直于磁铁502、磁铁503内部的磁力线方向。
第四实施例中的换能器7’的运动分析类似于第一实施例中换能器7的运动分析，在此不再赘述。
在根据发明的第四实施例中，近端和远端弹性件505A和505B的材料为金属。按照固体力学原理，在弯曲弹性变形状态下，弹性件等效为线性弹簧，以长方体弹性件为例，弹性件等效的线性弹簧劲度系数K＝3*E*I z/(a 3),
其中E为材料的弹性模量，I z为和驱动力或驱动力矩对应的弹性件惯性矩，a为驱动力在弹性件的作用点到该弹性件相当于手柄外壳静止的弹性件的另一边缘508的距离。
在驱动频率f 0等于机械固有频率f n时，机械部分处于受迫共振运动。当驱动线圈通过频率为f 0的交变电流I时，换能器7’和清洁组件受到频率为f 0的电磁力,驱动力的频率f 0介于换能器7’的固有频率f n的85％到115％之间。依照简谐振动原理，通常驱动力的频率f 0在机械固有频率f n的85％到115％之间时,可以认为机械部分处于受迫谐振运动，谐振运动和共振运动的电能转化为机械能效率很高。
类似地参考图8，施加于清洁元件3上的压力为F1，近端弹性件505A上的等效力为F2,远端弹性件505B上的等效力为F3。施加于清洁元件3上的压力为F1平行于清洁元件纵轴线L1，即垂直于中位平面P。参考图17，在第四实施例中，弹性件505A和505B平面相对于清洁元件的纵轴线L1的角度为角度δ，角度δ小于80度，本实施例中角度δ为60度。当清洁元件3上施加压力F1时，弹性件505A和505B能产生平行于清洁元件纵轴线L1的分力，由于弹性件505A和505B的一边缘509固联包络驱动轴的换能器机架部分512，另一边缘508固联机架凸起511，按照力矩平衡和力的平衡原则，其中近端弹性件505A上的等效力F2的方向和压力F1的方向相反，远端弹性件505B上的等效力F3的方向和压力F1的方向相同，近端弹性件505A呈拉伸状态以产生等效力F2，远端弹性件505B呈拉伸状态以产生等效力F3。压力F1在垂直于弹性件平面的分力，造成弹性件505A和505B的压力弯曲变形，此压力弯曲变形会额外的增加弹性件的内部应力，有可能造成弹性件的屈服，从而造成换能器510的固有频率的剧烈变化，而使换能器失效。为避免换能器失效，本发明中，角度δ小于80度，且大于等于0度。更加优选地，角度δ小于等于60度，且大于等于0度，从而有效降低压力F1在垂直于第三弹性件平面的分力，降低压力F1造成的第三弹性件的压力弯曲变形。
同样重要地，近端弹性件505A上的等效力F2和远端弹性件505B上的等效力F3之间的距离对力矩平衡尤为重要，经过大量实验，结合生产工艺的可行性，在沿着驱动轴纵轴线L2方向上，近端弹性件的中心线L5距离远端弹性件的中心线L6为3.5mm以上，中心线为位于弹性件平面上且从机架紧固臂513指向包络驱动轴的换能器机架部分512的第二弹性件平面中心线。如图14所示，由于至少一个第三近端弹性件的中心线L5距离第三远端弹性件的中心线L6为3.5mm以上，相对于只有一个近端弹性件505A，更能避免清洁元件3上的压力F1对弹性件505A和505B造成的扭转变形，而避免弹性件的过大应力，从而避免换能器失效。
作为本发明第四实施例的一种变化形式，也可以只有两个弹性件505，两个弹性件505包括一个近端弹性件505A和一个远端弹性件505B，比如只有一个图15中位于驱动轴左边的近端弹性件505A，只有一个图15中位于驱动轴右边的弹性件505B，依旧可以满足本发明对弹性件组合的要求。
对于磁铁的分布和磁铁的位置，类似于对图10、图11、图12、图13的分析，在此不再赘述。以上各种组合都落入本发明的范围。
显然，与第一实施例类似，第四实施例中的金属的近端弹性件505A和远端弹性件505B也能实现对清洁元件的压力F1的识别。清洁元件上压力F1的清洁元件最大压力F1 M的范围是3N到15N，清洁元件启动压力F4大于等于0N且小于等于2.5N。
根据本发明的换能装置引入沿驱动轴错位布置的弹性件来平衡清洁元件上的压力F1引起的力和力矩，减少了清洁元件3上的压力F1对弹性件造成额外的弯曲变形，从而使换能器能长寿命地工作在谐振状态下，另一方面，确保换能器和清洁组件在谐振范围内，清洁元件上能够施加的力能更大。此外，采用根据本发明的弹性件的布置方式，能够实现清洁器件的小型化。
谐振状态或共振状态下的能量传递效率非常高。在现有的采用轴承(例如滚珠轴承)的驱动结构中，设置轴承之类的约束件是为了防止清洁器件除旋转运动外还存在其它运动，但是这种约束将带来噪音和能量损耗，也增加了成本。根据本发明，由于合理地配置弹性件和永磁体，可实现换能器的平稳转动，从而免去了一些为了实现清洁用具的旋转转动而必须设置的约束件。由于合理配置永磁体使得换能器7、换能器上受到的电磁合力近似为零，并巧妙利用作用在换能器7、换能器上的转矩，可以省去约束结构，因此使清洁用具结构更 紧凑，转动更平稳且噪音更小。
本发明虽然以较佳实施例公开如上，但其并不是用来限定本发明，任何本领域技术人员在不脱离本发明的精神和范围内，都可以做出可能的变动和修改。因此，凡是未脱离本发明技术方案的内容，依据本发明的技术实质对以上实施例所作的任何修改、等同变化及修饰，均落入本发明权利要求所界定的保护范围之内。

Claims (19)

  1. 一种用于清洁护理用具的换能装置，包括：
    换能器(7，7’)，所述换能器包括换能器机架(110、510)、附连到换能器机架的磁铁、附联到所述换能器机架的弹性组件以及驱动轴(101、501)，所述驱动轴具有近端和远端，并且所述驱动轴固附于所述换能器机架，其中所述驱动轴限定纵轴线(L2)，并且所述纵轴线延伸通过一中位平面(P)，并且所述中位平面基本垂直于所述清洁护理用具上的清洁作用力(F1)施加方向；以及
    驱动线圈(121、122、221、321、322、323、324)，所述驱动线圈相对所述换能器(7，7’)的所述磁铁布置，并且所述换能器相对所述驱动线圈可动；
    其特征在于，
    所述弹性组件包括沿所述纵轴线(L2)偏置布置的至少一个近端弹性件(105A、505A)和至少一个远端弹性件(105B、505B)，所述近端弹性件相比所述远端弹性件靠近所述驱动轴的近端，
    其中，所述近端弹性件(105A、505A)和所述远端弹性件(105B、505B)分别具有第一边缘(109，509)和第二边缘(108，508)，所述第一边缘(109，509)固联于所述驱动轴以随所述驱动轴移动，所述第二边缘(108，508)构成所述近端弹性件和所述远端弹性件弹性变形时的固定边缘，所述近端弹性件(105A、505A)和所述远端弹性件(105B、505B)各自的平面基本从所述纵轴线沿径向向外延伸。
  2. 如权利要求1所述的换能装置，其特征在于，
    所述近端弹性件和所述远端弹性件各自沿所述纵轴线的宽度的中心线之间的距离至少为3.5mm。
  3. 如权利要求1所述的换能装置，其特征在于，
    所述近端弹性件的平面相对所述中位平面(P)形成第一角度，所述远端弹性件的平面相对所述中位平面形成第二角度，其中所述第一角度和所述第二角度大于等于10度且小于等于90度。
  4. 如权利要求1至3中任一项所述的换能装置，其特征在于，
    所述近端弹性件和所述远端弹性件位于所述中位平面的相对两侧上或者位于所述中位平面的同一侧上，并且所述近端弹性件和所述远端弹性件位于垂直于所述中位平面(P)且包含所述纵轴线的垂直平面的相对两或者同一侧上，
    或者所述近端弹性件和所述远端弹性件沿着所述垂直平面的方向。
  5. 如权利要求1或2所述的换能装置，其特征在于，
    所述近端弹性件为塑料或金属或者主要由塑料或金属构成，所述远端弹性件为塑料或主要由塑料构成。
  6. 如权利要求1至3中任一项所述的换能装置，其特征在于，所述近端弹性件关于所述纵轴线对称地成对布置，所述远端弹性件关于所述纵轴线对称地成对布置。
  7. 如权利要求1所述的换能装置，其特征在于，
    所述弹性组件还包括至少另一弹性件(104A、104B)，所述至少另一弹性件由金属构成，并且沿所述纵轴线相对所述近端弹性件和所述远端弹性件偏置设置，所述金属弹性件的平面与所述中位平面之间的角度小于所述近端弹性件和远端弹性件的平面与所述中位平面之间的角度；
    所述另一弹性件的弹性模量为远端弹性件的弹性模量的二十倍以上。
  8. 如权利要求1所述的换能装置，其特征在于，
    所述换能器机架包括包络所述驱动轴的换能器机架部分(112)以及在径向方向与所述驱动轴隔开的成对的机架紧固壁(113)，
    其中所述机架紧固壁(113)具有上凸部和下凸部，所述上凸部和所述下凸部在所述机架紧固壁上偏置布置，
    所述第一边缘固定到所述换能器机架部分，而所述第二边缘分别固定到所述机架紧固壁的上凸部和下凸部。
  9. 如权利要求1所述的换能装置，其特征在于，
    所述驱动线圈被布置成相对于所述清洁护理用具的外壳无相对运动，并且所 述驱动线圈布置在所述磁铁产生的磁场中，所述磁铁(102、103、202、203、302)产生的磁力线和驱动线圈(121、122)中的电流I方向之间夹角约为90度，
    其中，所述驱动线圈中通过频率为f 0的交变电流I，由此所述驱动线圈和所述磁铁相互作用产生以驱动轴纵轴线(L2)为轴线的往复力偶，所述往复力偶驱动所述换能器谐振。
  10. 一种用于清洁护理用具的压力报警机构，包括：
    驱动轴(101)，所述驱动轴限定纵轴线并具有近端和远端，并且驱动部从所述驱动轴的所述远端附连到所述驱动轴，当清洁护理用具的清洁作用力(F1)沿第一方向施加时，所述近端沿第一方向产生第一位移，
    近端弹性件(105A、505A)，所近端弹性件的第一边缘(109)固联于所述驱动轴以随所述驱动轴移动，所述近端弹性件所在位置构成所述驱动轴的支点；
    远端弹性件(105B、505B)，所述远端弹性件相对所述近端弹性件沿纵轴线朝所述远端偏置，所述远端弹性件的第一边缘(109)固联于所述驱动轴以随所述驱动轴移动，在所述清洁作用力(F1)施加于所述近端时，所述远端弹性件的第一边缘所在位置的驱动轴沿与所述第一方向相反的第二方向产生第二位移；
    传感装置所述传感装置包括固定部件和可动部件，所述可动部件设置在所述驱动部上，在所述清洁作用力(F1)施加于所述近端时，所述可动部件相对固定部件沿第二方向产生第三位移，当所述清洁作用力(F1)超出最大压力(F1 M)时，所述可动部件相对固定部件的位移使所述压力报警机构的警报装置产生警报指示。
  11. 如权利要求10所述的压力报警机构，其特征在于，
    所述近端弹性件(105A、505A)和所述远端弹性件(105B、505B)分别具有与所述第一边缘相对的第二边缘(108，508)，所述第二边缘(108，508)构成所述近端弹性件和所述远端弹性件弹性变形时的固定边缘，
    其中所述近端弹性件和所述远端弹性件各自沿所述纵轴线的宽度的中心线之间的距离至少为3.5mm。
  12. 如权利要求10或11所述的压力报警机构，其特征在于，
    所述纵轴线延伸通过一中位平面，并且所述中位平面基本垂直于所述清洁作用力，所述近端弹性件的平面相对所述中位平面(P)形成第一角度，所述远端弹性件的平面相对所述中位平面形成第二角度，其中所述第一角度和所述第二角度大于等于10度且小于等于90度，
    其中所述近端弹性件和所述远端弹性件位于所述中位平面的相对两侧上或者位于所述中位平面的同一侧上，并且所述近端弹性件和所述远端弹性件位于垂直于所述中位平面(P)且包含所述纵轴线的垂直平面的相对两或者同一侧上，或者所述近端弹性件和所述远端弹性件沿着所述垂直平面的方向。
  13. 如权利要求10所述的压力报警机构，其特征在于，
    所述驱动部包括磁铁和机架，所述磁铁通过所述机架附连到所述驱动轴的远端，
    所述可动部件相比所述驱动轴的近端更远离所述近端弹性件。
  14. 如权利要求10所述的压力报警机构，其特征在于，所述传感装置的固定部件包括感应器件和发射源，所述感应器件和所述发射源固定之间形成间隙，所述可动部件包括可移动进入在所述感应器件和所述发射源之间间隙的阻挡块，
    其中所述感应器件和发射源包括电、磁和光感应器件和发射源中的至少一种。
  15. 如权利要求14所述的压力报警机构，其特征在于，所述感应器件和发射源设置在所述清洁护理用具的壳体上或相对于外壳固定的零件上。
  16. 如权利要求10所述的压力报警机构，其特征在于，所述压力报警机构包括压力限制部，所述压力限制部限制所述可动部件的移动范围，使所述最大压力(F1 M)在2.5N到15N的范围内，
    其中，所述最大压力限制部设置在所述清洁护理用具的外壳或相对于外壳固定的零件上。
  17. 如权利要求16所述的压力报警机构，其特征在于，
    所述压力报警机构还包括驱动线圈，所述驱动线圈被布置成相对于所述清洁护理用具的外壳无相对运动，并且所述驱动线圈布置在所述驱动部的磁铁产生的磁场中，所述磁铁(102、103、202、203、302)产生的磁力线和驱动线圈(121、122)中的电流I方向之间夹角约为90度，
    其中，所述驱动线圈中通过频率为f0的交变电流I，由此所述驱动线圈和所述磁铁相互作用产生以驱动轴纵轴线(L2)为轴线的往复力偶，所述往复力偶驱动包括所述驱动轴、所述近端弹性件和所述远端弹性件的换能器谐振。
  18. 一种清洁护理用具，所述清洁护理用具包括如权利要求1至9中任一项所述的换能装置或包括如权利要求10至17中任一项所述的压力报警机构，所述清洁护理用具包括电动牙刷、电动剃须刀、电动洁面器和电动沐浴器中的一种。
  19. 如权利要求18所述的清洁护理用具，其特征在于，所述换能器(7)和所述清洁护理用具的清洁组件组成谐振体，所述驱动线圈和所述磁铁相互作用产生以驱动轴纵轴线(L2)为轴线的往复力偶，所述往复力偶驱动所述谐振体作谐振，所述谐振体的固有频率f n介于所述往复力偶的频率f 0的85％和115％之间。
PCT/CN2022/101744 2021-06-28 2022-06-28 清洁护理用具及其换能装置和压力报警机构 WO2023274188A1 (zh)

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