CN216162590U - Cleaning and nursing tool and energy conversion device and pressure alarm mechanism thereof - Google Patents

Cleaning and nursing tool and energy conversion device and pressure alarm mechanism thereof Download PDF

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Publication number
CN216162590U
CN216162590U CN202121448380.7U CN202121448380U CN216162590U CN 216162590 U CN216162590 U CN 216162590U CN 202121448380 U CN202121448380 U CN 202121448380U CN 216162590 U CN216162590 U CN 216162590U
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transducer
proximal
distal
cleaning
elastic
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Chinese (zh)
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戴晓国
徐振武
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Shanghai Shift Electrics Co Ltd
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Shanghai Shift Electrics Co Ltd
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Abstract

The utility model provides a cleaning and nursing tool, a transducer device and a pressure alarm mechanism thereof. The transducer assembly according to the utility model comprises a transducer, wherein the elastic assembly comprises at least one proximal elastic element and at least one distal elastic element, the proximal elastic element and the distal elastic element having a first edge and a second edge, respectively, wherein the first edge is fixedly coupled to the drive shaft for movement therewith and the second edge is a fixed edge when the proximal elastic element and the distal elastic element are elastically deformed, wherein the plane of the proximal elastic element forms a first angle with respect to a median plane of the housing and the plane of the distal elastic element forms a second angle with respect to the median plane. By adopting the energy conversion device, the elastic part can be protected from failure, the volume of the energy conversion device is reduced, and the pressure alarm mechanism can be realized by the elastic component.

Description

Cleaning and nursing tool and energy conversion device and pressure alarm mechanism thereof
Technical Field
The utility model relates to the technical field of cleaning and nursing tools, in particular to a transducer and a pressure alarm mechanism in a cleaning and nursing tool.
Background
For personal cleaning and care appliances such as electric toothbrushes, electric shavers, electric face cleaners, electric showers, etc., it is important to have a transducer device that converts the reciprocating motion into a desired rotational motion of the cleaning elements, and these personal cleaning and care appliances should be simple in construction, easy to assemble, long in service life, safe, reliable, and small in size.
Many drive configurations for driving the cleaning elements are known, such as motors, magnetic systems, and electromagnetic systems. Some drive configurations use bearings, such as ball bearings, to support the drive, which are expensive and complex, and also present noise and motor damping.
The applicant of the present invention enjoys another chinese patent with publication number CN104617732B, discloses a personal cleansing and nursing tool, wherein the transducing mechanism comprises a driving shaft, transducer elastic member fixing members fastened to the left and right side supports of the driver, at least two permanent magnets, corresponding permanent magnet supports for fixedly connecting the permanent magnets, left and right transducer transmission arms fixedly connected to the permanent magnet supports and fixedly connected to the driving shaft, and at least two left and right transducer elastic members disposed on the left and right sides of the longitudinal axis of the driving shaft, wherein the left and right permanent magnets are independent of each other, the polarity of the magnetic pole of one permanent magnet in the direction of the driving coil is S-pole or N-pole, the polarity of the magnetic pole of the other permanent magnet in the direction of the driving coil is opposite to the polarity of the magnetic pole of the permanent magnet on the one side, and the left and right permanent magnets are disposed such that the angles of the directions of the magnetic lines of force inside the permanent magnets and the directions of the longitudinal axis of the driving coil are respectively greater than 45 ° and less than 135 °, the left and right permanent magnets can move relative to the elastic part fixing part; when the drive coil passing frequency is f0When the alternating current I is adopted, the motion directions of the left permanent magnet and the right permanent magnet are approximately parallel to the longitudinal axis direction of the driving coil iron core.
In the above-mentioned scheme, the drive shaft need not install ball bearing, but because the ability of the balanced pressure on the cleaning element of elastic component is limited, long-time the use causes the fatigue of elastic component easily and yields to influence the life-span of transducer, again because the elastic component links firmly with corresponding transducer transmission arm respectively and transducer elastic component mounting is solid, make the whole volume of transducer great, be unfavorable for cleaning appliance's miniaturization. Accordingly, there remains a need for improvements to existing personal cleansing care appliances.
SUMMERY OF THE UTILITY MODEL
To overcome the deficiencies of the prior art, the present invention provides a personal cleansing implement comprising: a transducer and a drive coil, wherein the transducer comprises a transducer housing, a magnet attached to the transducer housing, a resilient assembly attached to the transducer housing, and a drive shaft; wherein the drive shaft has a proximal end and a distal end and is attached to the transducer housing and defines a longitudinal axis and the longitudinal axis extends through a median plane that is substantially perpendicular to a cleaning force on the cleaning implement; and a magnet arrangement in which the drive coil is disposed relative to the transducer and the transducer is movable relative to the drive coil, wherein the resilient assembly comprises at least one proximal resilient member and at least one distal resilient member arranged offset along a longitudinal axis, the proximal resilient member being closer to the proximal end of the drive shaft than the distal resilient member, wherein the proximal and distal resilient members each have a first edge and a second edge, the first edge being fixedly coupled to the drive shaft for movement therewith, the second edge constituting a fixed edge for the proximal and distal resilient members to elastically deform, and the respective planes of the proximal and distal resilient members extend substantially radially outwardly from the longitudinal axis.
According to a preferred aspect of the utility model, the distance between the centerlines of the width of the proximal and distal elastic members, respectively, along the longitudinal axis is at least 3.5 mm.
According to a preferred aspect of the utility model, the plane of the proximal spring element forms a first angle with respect to the median plane and the plane of the distal spring element forms a second angle with respect to the median plane, wherein the first angle and the second angle are equal to or greater than 10 degrees and equal to or less than 90 degrees.
According to a preferred aspect of the utility model, the proximal and distal elastic elements are located on opposite sides of the median plane or on the same side of the median plane, and the proximal and distal elastic elements are located on opposite sides or on the same side of a vertical plane perpendicular to the median plane P and containing the longitudinal axis. Alternatively, the proximal elastic member and the distal elastic member are arranged in a direction perpendicular to the plane.
According to another preferred aspect of the utility model, the proximal resilient element is formed of plastic or metal and the distal resilient element is formed of plastic.
According to another preferred aspect of the utility model, the proximal elastic elements are symmetrically arranged in pairs about the longitudinal axis and the distal elastic elements are symmetrically arranged in pairs about the longitudinal axis.
According to another preferred aspect of the utility model, the resilient assembly further comprises at least one further resilient element, the at least one further resilient element being formed of metal and being arranged offset along the longitudinal axis with respect to the proximal and distal resilient elements, the angle between the plane of the metal resilient element and the median plane being smaller than the angle between the plane of the proximal and distal resilient elements and the median plane; the metal further resilient element has a total modulus of elasticity that is more than twenty times greater than the total modulus of elasticity of the distal resilient element.
According to another preferred aspect of the utility model, the transducer housing comprises a transducer housing portion enveloping the drive shaft and a pair of housing fastening walls spaced apart from the drive shaft in a radial direction, wherein the housing fastening walls have an upper and a lower protrusion, the upper and lower protrusions being offset on the housing fastening walls, the first edge being fixed to the transducer housing portion and the second edge being fixed to the upper and lower protrusions of the housing fastening walls, respectively.
The utility model also provides a pressure alarm mechanism for a cleaning and nursing tool, comprising: a drive shaft defining a longitudinal axis and having a proximal end and a distal end, the drive shaft having a distal end attached to the drive shaft, the proximal end producing a first displacement in a first direction when a cleaning force F1 of the cleaning implement is in the first direction, a proximal resilient member having a first edge fixedly attached to the drive shaft for movement therewith, the proximal resilient member being positioned to form a fulcrum for the drive shaft; a distal resilient member biased distally along the longitudinal axis relative to the proximal resilient member, a first of the distal resilient membersAn edge fixedly coupled to the drive shaft for movement therewith, the drive shaft at a location of the first edge of the lower resilient element producing a second displacement in a second direction opposite the first direction when a cleaning force F1 is applied to the proximal end; a sensing device including a fixed component and a movable component, wherein the movable device is arranged on the driving part, when the cleaning acting force F1 is applied to the proximal end, the movable component generates a third displacement along the second direction relative to the fixed component, and when the cleaning acting force F1 exceeds the maximum pressure F1MAt this time, the displacement of the movable member relative to the fixed member causes an alarm device of the pressure alarm mechanism to generate an alarm indication.
According to another preferred aspect of the utility model, the proximal elastic member and the distal elastic member have second edges opposite to the first edges, respectively, the second edges constituting fixing edges when the proximal elastic member and the distal elastic member are elastically deformed, wherein a distance between center lines of 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 element forms a first angle relative to the median plane (P), and the plane of the distal elastic element forms a second angle relative to the median plane, the first angle being greater than or equal to 10 degrees and less than or equal to 90 degrees.
According to another preferred aspect of the utility model, 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 element forms a first angle with respect to the median plane P, the plane of the distal elastic element forms a second angle with respect to the median plane, wherein the first angle and the second angle are equal to or greater than 10 degrees and equal to or less than 90 degrees, wherein the proximal elastic element and the distal elastic element are located on opposite sides of the median plane or on the same side of the median plane, and the proximal elastic element and the distal elastic element are located on opposite sides of or along the cleaning force direction and the plane in which the longitudinal axis is located.
According to another preferred aspect of the present invention, the drive portion includes a magnet and a frame, the magnet being attached to the distal end of the drive shaft through the frame, the movable member being farther from the proximal elastic member than the proximal end of the drive shaft.
According to another preferred aspect of the utility model, the stationary part of the sensing device comprises an induction device and a radiation source, a gap being formed between the induction device and the radiation source, and the movable part comprises a blocking block movable into the gap between the induction device and the radiation source, wherein the induction device and the radiation source comprise at least one of an electric, magnetic and light-sensitive device and the radiation source.
According to a further preferred aspect of the utility model, the sensor device and the radiation source are arranged on a circuit board or a housing of the cleaning and care appliance or on a component which is fixed relative to the housing. Wherein, the parts fixed relative to the shell comprise a circuit board, a battery compartment frame and the like.
According to another preferred aspect of the present invention, the pressure warning mechanism includes a pressure limiting portion that limits a moving range of the movable member such that the sensing device has a maximum pressure F1MIn the range of 2.5N to 15N, wherein the maximum pressure limitation is provided on the housing of the cleaning and care appliance or on a part which is fixed relative to the housing.
In addition, the utility model also provides a cleaning and nursing tool, the cleaning and nursing tool comprises the energy conversion device or the pressure alarm mechanism, and the cleaning and nursing tool comprises one of an electric toothbrush, an electric shaver, an electric face cleaner and an electric shower.
Furthermore, according to the utility model, the drive coil is arranged without relative movement with respect to the housing of the cleaning and care appliance and is arranged in the magnetic field generated by the magnet, the magnetic field lines generated by the magnet and the direction of the current I in the drive coil form an angle of approximately 90 degrees, the passage frequency in the drive coil being f0Whereby said drive coil and said magnet interact to produce a reciprocating couple about the longitudinal axis of the drive shaft, the reciprocating couple driving said transducer into resonance.
Furthermore, in a cleaning and care implement according to the utility model, the transducer and the cleaning assembly of the cleaning and care implement form a resonant body, the drive coil and the magnet interacting to generate a reciprocating couple about the drive shaft longitudinal axis L2, the reciprocating couple driving the resonant body into resonance, the natural frequency fn of the resonant body being between 85% and 115% of the frequency f0 of the reciprocating couple.
By adopting the energy conversion device, the problem that the elastic part is easy to fatigue and yield is solved, the service life of the energy conversion device is prolonged, the miniaturization of personal cleaning and nursing tools is realized, and the energy conversion device is convenient to assemble, stable to rotate, low in noise, low in damping, safe and reliable. In addition, the pressure warning mechanism may identify the amount of pressure applied to the cleaning element.
Drawings
For a more complete understanding of the present invention, reference is made to the following description of exemplary embodiments taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a perspective view of a personal care cleaning appliance and internal cartridge in accordance with a first preferred embodiment of the present invention;
FIG. 2 is an exploded view of an internal cartridge of the cleaning and care implement of FIG. 1 including a transducer assembly;
FIG. 3 is a perspective view of a transducer assembly according to a first preferred embodiment of the present invention;
FIG. 4 is a perspective view of a transducer device according to a first preferred embodiment of the present invention, showing an elastic member in the transducer device;
fig. 5 shows two kinds of first elastic members and a drive shaft adapted to be used according to the first embodiment of the present invention;
FIG. 6 shows two first elastic members suitable for use in a transducer according to a first embodiment of the utility model;
FIG. 7 is a schematic end view showing the positional relationship of the cleaning member and the first and second elastic members;
FIG. 8 illustrates a force diagram of the elastomeric member and cleaning assembly along the longitudinal axis in accordance with a preferred embodiment of the present invention;
FIG. 9 is a bottom perspective view of a transducer assembly and circuit board according to a first embodiment of the present invention;
FIG. 10 shows a perspective view of a transducer arrangement according to a second preferred embodiment of the utility model;
FIG. 11 is another perspective view of the transducer assembly of FIG. 10 showing the drive coils;
FIG. 12 is a perspective view of a transducer arrangement according to a third embodiment of the utility model;
FIG. 13 is another perspective view of the transducer arrangement shown in FIG. 12 with the drive coil removed;
FIG. 14 is a perspective view of a transducer arrangement according to a fourth embodiment of the utility model;
FIG. 15 is a schematic view showing a combination of a driving shaft, an elastic member and a magnet in the transducer device shown in FIG. 14 according to the fourth embodiment of the present invention;
FIG. 16 is a schematic view of an elastic member in the transducer device shown in FIG. 15 according to the fourth preferred embodiment of the present invention; and
FIG. 17 is a diagram showing the relationship between the holder, the elastic member and the cleaning element of the transducer device according to the fourth preferred embodiment of the present invention.
List of reference numerals
1 handle
2 cleaning element carrier
3 cleaning element
4 circuit board
5 Battery
7. 7' transducer
101 drive shaft
102 first magnet
103 second magnet
104 first elastic member
104A first elastic member
104B first elastic member
105 second elastic member
105A proximal second elastic element
105B distal second elastic member
106 edge of the first elastic member
107 edge of the first elastic member
108 edge of the second elastic member
109 edge of the second elastic member
110 transducer carrier
111 frame projection
112 envelope the transducer housing portion of the drive shaft
113 frame fastening arm
114 rack follower block
115 support arm
121 first driving coil
122 second driving coil
131 transducer upper shell
132 transducer lower shell
133 fastening screw
134 drive coil bobbin
135 cell cabin
202 magnet
203 magnet
221 Driving coil
204A, 204B first resilient member
302 cylindrical magnet
321. 322, 323, 324 drive coils
401 photosensitive element
402 light source
501 drive shaft
502 first magnet
503 second magnet
505A proximal elastic member
505B distal spring
508 edge of elastic member
509 edge of elastic member
510 transducer carrier
511 frame projection
512 envelope drive shaft transducer housing portion
513 Rack fastening arm
Longitudinal axis of L1 cleaning element
Longitudinal axis of L2 drive shaft
L3 center line of the proximal second elastic element
Center line of L4 distal second elastic member
L5 center line of proximal elastic member
Center line of L6 distal elastic member
Angle of alpha 1, alpha 2, alpha 3, alpha 4 second elastic member plane and longitudinal axis of cleaning element
Angle of beta 1, beta 2, beta 3, beta 4 first elastic member plane and longitudinal axis of cleaning element
Angles of δ 1, δ 2, δ 3, δ 4 elastic member plane and longitudinal axis of cleaning element
Detailed Description
The present invention is further described in the following description with reference to specific embodiments and the accompanying drawings, wherein the details are set forth in order to provide a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms different from those described herein, and it will be readily appreciated by those skilled in the art that the present invention can be implemented in many different forms without departing from the spirit and scope of the utility model.
An exemplary embodiment of the present invention is described in more detail below with reference to the accompanying drawings, using a power toothbrush as a representative example of a personal cleaning care appliance. Although the following description will be made by taking only the electric toothbrush as an example, the present invention is not limited thereto. The present invention is also applicable to cleaning and care appliances such as electric shavers, electric face cleaners, electric showers, etc., which are capable of providing a cleaning action through a transducer.
For clarity, terms expressing relative spatial positions such as "upper", "lower", "left", "right", "proximal", "distal", and the like are used herein to describe simply the relationship of one element or feature to another element(s) or feature(s) as shown, wherein the direction of the longitudinal axis of the drive coil refers to the direction of magnetic lines of force generated inside the core when the drive coil is subjected to a current I; "upper" and "lower" are relative to the longitudinal axis of the drive shaft, and are defined as "upper" in an upward direction parallel to the longitudinal axis of the drive shaft and "lower" in a downward direction parallel to the longitudinal axis of the drive shaft facing the respective views; "left" and "right" are relative to the drive shaft longitudinal axis, and are defined as "left" on the left side of the drive shaft longitudinal axis and "right" on the right side thereof facing the respective views in a direction perpendicular to the drive shaft longitudinal axis; "proximal end" refers to the end or side that is near the location of application of the cleaning force when the cleaning care implement is in use; "distal end" refers to the end or side of the cleaning care implement that is distal from the point at which the cleaning force is applied when the cleaning care implement is in use.
Further, as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed words.
Although the word "first" or the like is used in this specification to describe various elements or components, these elements or components should not be limited by these words. These terms are only used to distinguish one element or constituent from another element or constituent, and do not include "order". Accordingly, the ordinal numbers of those elements or components discussed below are interchanged with one another without departing from the spirit and scope of the utility model.
Fig. 1 and 2 show a perspective view and an exploded perspective view, respectively, of a cleaning and care implement according to a first preferred embodiment of the present invention. The following describes the cleaning and care implement as an example of an electric toothbrush. The electric toothbrush basically comprises a handle 1 and a cleaning assembly detachably mounted on the handle 1. The handle 1 includes a handle housing and various functional components mounted 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 mounted to the handle 1, for example, in a snap-fit coupling which allows the drive handle 1 and cleaning assembly to be securely coupled together and also allows the drive handle 1 and cleaning assembly to be easily separated. The cleaning elements 3 may be items such as bristles.
The functional components in the handle 1 of the cleaning and care implement mainly comprise a power supply part, a control part, a trigger part and a transducer device. The power supply section generally includes a rechargeable battery 5 and a charging circuit mounted in a battery compartment 135 for supplying power to various parts of the appliance; the control part mainly comprises a circuit board 4 for controlling various working modes of the electric toothbrush, the opening or closing of the electric toothbrush and the like; the trigger part comprises a switch for starting and stopping the operation of the electric toothbrush; the transducer arrangement is configured to convert the input electrical energy to mechanical energy that provides reciprocating motion of the cleaning assembly.
Fig. 2, 3 and 4 show a transducer device according to a first embodiment of the utility model. The transducer device mainly comprises a transducer 7, the drive coil of the transducer device being arranged opposite to the transducer 7. The transducer 7 mainly comprises a transducer housing 110, a first magnet 102, a second magnet 103, a drive shaft 101 to which a cleaning assembly is detachably mounted, and a resilient assembly for inducing a resonant motion.
Preferably, the material of the transducer housing 110 is plastic, and in the first embodiment, the first magnet 102, the second magnet 103, which are part of the transducer 7, are fixedly attached to the distal end of the transducer housing 110, which is remote from the cleaning element 3, by means of glue, screws or injection molding, such that the magnets 102, 103 are an integral part of the transducer 7.
Preferably, the transducer arrangement further comprises an upper transducer housing 131 and a lower transducer housing 132 which are fastened together, for example by means of fastening screws 133, so that the housing fastening arms 113 of the transducer housing 110 are pressed between the two housings and the transducer housing 110 is correspondingly locked. The transducer upper shell 131 and the transducer lower shell 132 are then further fastened to the housing of the appliance. It should be understood that in other alternative embodiments, the transducer upper and lower shells may be integral parts of the handle housing.
In a first preferred embodiment, as shown in fig. 4, the elastic assembly of the transducer 7 comprises four first elastic members 104 and four second elastic members 105. More specifically, as shown in fig. 4, along the drive shaft 101, the elastic assembly includes, in order from the proximal end to the distal end, two first elastic members 104A, two second elastic members (proximal elastic members) 105A, two second elastic members (distal elastic members) 105B, and two first elastic members 104B.
Each of the first elastic members 104A and 104B is substantially rectangular parallelepiped. The distance from the first elastic members 104A and 104B to the transducer housing portion 112 at the housing fastening arms 113 is an elastic member length, the distance of the first elastic members 104A and 104B along the drive shaft longitudinal axis L2 is referred to as an elastic member width, the remaining other side of the rectangular parallelepiped is an elastic member thickness, and the plane formed by the respective lengths and widths of the first elastic members 104A and 104B is an elastic member plane. Similarly, each of the second elastic members 105 is substantially a rectangular parallelepiped, the distance from the frame projection 111 of the second elastic members 105A and 105B at the frame fastening arm 113 to the transducer frame portion 112 is the length of the elastic member, the distance of the second elastic members 105A and 105B in the direction of the longitudinal axis of the drive shaft is the width of the elastic member, and the other side of the rectangular parallelepiped is the thickness of the elastic member. The plane formed by the length and width of the second elastic members 105A and 105B is the elastic member plane.
As shown in fig. 7, the four first elastic members 104A and 104B are located in the same plane, which is in the median plane P of the transducer device. For the transducer device according to the utility model, the median plane P is defined as the plane perpendicular to the direction of the cleaning force F1 and to the drive shaft longitudinal axis L2, the cleaning force F1 being perpendicular to the drive shaft longitudinal axis L2. In the electric toothbrush, the direction of the cleaning force F1 is defined as the direction in which the longitudinal axis L1 of the cleaning elements 3 lies, i.e. the median plane P is substantially perpendicular to the longitudinal axis L1 of the cleaning elements 3. Since the first spring element 104 is located in the neutral plane P, the plane of the first spring element 104 is at an angle of 0 ° to the longitudinal axis L2 of the drive shaft. More specifically, in the first embodiment, the angles of the spring plane of the first springs 104A and 104B and the longitudinal axis L1 of the cleaning elements are β 1, β 2, β 3, β 4, respectively, as shown in fig. 7. in this embodiment, β 1, β 2, β 3, β 4 are all equal to 90 degrees, and the longitudinal axis L1 of the cleaning elements is perpendicular to the first spring plane. However, in alternative embodiments, the angles β 1, β 2, β 3, β 4 may also take different values.
Further, the second resilient member 105 of the resilient assembly includes a proximal resilient member 105A and a distal resilient member 105B arranged in pairs, the pairs being offset along the longitudinal axis L2. The proximal resilient member 105A is closer to the proximal end of the drive shaft 101, while the distal resilient member 105B is closer to the distal end of the drive shaft 101. The plane of the second resilient member 105 is the plane connecting the frame projection 111 and the transducer frame portion 112 enveloping the drive shaft, preferably at an angle greater than 30 degrees to the median plane in which the longitudinal axis L2 lies, and preferably at an angle less than 30 degrees to the longitudinal axis L2.
Unlike the arrangement in which the first elastic elements 104A and 104B lie in the median plane P, the four second elastic elements 105 are each arranged at an angle with respect to the median plane P, in other words the four second elastic elements 105 are arranged at an angle with respect to the plane in which the longitudinal axes L1 and L2 of the cleaning elements 3 lie. The proximal elastic elements 105A and the distal elastic elements 105B are respectively arranged obliquely on opposite sides of the median plane P, as shown in fig. 7, the proximal elastic elements 105A being positioned on the upper side of the median plane P at an angle with respect to the median plane P, and the distal elastic elements 105B being positioned on the lower side of the median plane P at an angle with respect to the median plane P.
As shown in fig. 7, the four second elastic members 105A and 105B are α 1, α 2, α 3, α 4 with respect to the longitudinal axis L1, respectively, and in order to avoid transducer exchange due to yielding of the elastic members, the angles α 1, α 2, α 3, α 4 are equal to or less than 80 degrees and equal to or greater than 0 degrees, and more preferably, the angles α 1, α 2, α 3, α 4 are equal to or less than 60 degrees and equal to or greater than 0 degrees. In the first embodiment as shown in fig. 7, the angles α 1, α 2, α 3, α 4 are all equal to 60 degrees. In other words, the angle between the plane 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, and more preferably, the angle between the plane of the second elastic members 105A and 105B and the median plane P is greater than 30 degrees and less than or equal to 90 degrees. In the embodiment shown in fig. 7, 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 α 1, α 2, α 3, α 4 may also take different values.
In the first embodiment, the first elastic member 104 and the second elastic member 105 are both fixed by the transducer frame 110. Specifically, as shown in fig. 4, the transducer housing 110 includes a transducer housing portion 112 that envelopes the drive shaft and two housing securing arms 113 disposed radially away from the transducer housing portion 112. Wherein the frame fastening arms 113 are arranged in pairs on opposite sides of the longitudinal axis L2.
The pairs of first resilient members 104 have their edges 106 secured to two frame fastening arms 113, respectively, and the other edge 107 of the first resilient member 104 is secured to a transducer frame portion 112 that envelopes the drive shaft, at a location substantially corresponding to the longitudinal axis L2, with the first resilient members 104A and 104B extending between the frame fastening arms 113 and the transducer frame portion 112 adjacent the longitudinal axis L2.
Similarly, the edges 109 of the second resilient member 105A and the second resilient member 105B are respectively secured to a transducer housing portion 112 that envelopes the drive shaft, while the opposite edges 108 are secured to housing fastening arms 113. To achieve an angled arrangement of the second resilient members 105A and 105B relative to the median plane P, frame protrusions 111 project from opposite sides of the frame fastening arms 113. The frame projection 111 is part of the frame fastening arm 113, and thus the frame projection 111 may also be understood as part of the transducer frame 110. The edges 108 of the second elastic members 105 are each fixed to a corresponding frame projection 111.
In other alternative embodiments, the frame protrusions 111 may not be provided, for example, the frame protrusions 111 may be replaced by thickened frame fastening arms 113.
The two first elastic members 104A and the two first elastic members 104B, which are distributed with a displacement along the longitudinal axis L2 of the drive shaft, are made of metal. As shown in fig. 5 and 6, the two first resilient members 104A and 104B, which are distributed along the longitudinal axis L2 of the drive shaft, may form an integral first resilient member assembly that is stamped and formed from a single piece of sheet metal, or may be formed from two resilient member assemblies that each include a resilient member 204A and a resilient member 204B. In other alternative embodiments, four independent elastic members may be combined to form the first elastic member assembly. The assembly of the various first resilient members described above can still be considered to consist of two separate first resilient members 104A distributed along the drive shaft longitudinal axis L2 and two separate first distal resilient members 104B distributed along the drive shaft longitudinal axis L2.
More specifically, it can be said that the proximal elastic member may comprise two separate second elastic members 105A, while the distal elastic member comprises two separate second elastic members 105B. As shown in fig. 4, four frame protrusions 111 are distributed on the transducer frame 110, the four frame protrusions 111 are respectively fixedly connected to the other edges 108 of the corresponding second elastic members 105A and 105B, and the other edges 109 of the second elastic members 105A and 105B are fixedly connected to the transducer frame portion 112 enveloping the driving shaft, so that the second elastic members 105A and 105B extend between the frame protrusions 111 and the transducer frame portion 112 enveloping the driving shaft.
As shown in fig. 2, 3 and 4, the first magnet 102 and the second magnet 103 of the transducer 7 are symmetrically arranged on the upper side and the lower side of the longitudinal axis L2 of the drive shaft (and on the lower side, not matching left and right, the magnets are arranged up and down, the drive coil is arranged left and right), i.e. above and below the median plane P, respectively. The first and second drive coils 121 and 122 are located on respective left and right sides of the drive shaft longitudinal axis L2, and the first and second drive coils 121 and 122 are fixedly disposed relative to the handle housing so that there is no relative movement of the drive coils 121 and 122 relative to the handle housing. The magnetic poles of the first and second magnets 102, 103 face the first or second drive coil 121, 122, and the first and second magnets 102, 103 facing the same drive coil 121, 122 have opposite magnetic poles, and as shown in fig. 4, the first magnet 102 facing the second drive coil 122 has an S-pole and the second magnet 103 facing the second drive coil 122 has an 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 lines of force inside the first magnet 102 and the second magnet 103.
The following is a motion analysis performed in connection with a transducer device according to a first embodiment of the utility model.
Referring to fig. 1 to 4, when a user activates the switch button of the electric toothbrush to activate the electric toothbrush, the circuit board 4 in the handle 1 activates the driving coils 121, 122, the first driving coil 121 and the second driving coil 122 pass an alternating current I having a frequency f0, 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, and if the direction of the current I in the first driving coil 121 is clockwise, the direction of the current I in the second driving coil 122 is counterclockwise. The first magnet 102 and the second magnet 103 facing the same drive coil have opposite magnetic poles. There is no relative movement of the first and second drive coils 121, 122 and the handle housing. The magnetic field formed by the first and second magnets 102 and 103 interacts with the energized first and second drive coils 121 and 122 to generate an electromagnetic force. The first magnet 102 and the second magnet 103 are subjected to the same electromagnetic force and opposite electromagnetic forces, and the transducer 7 is subjected to the balanced electromagnetic force, but since the first magnet 102 and the second magnet 103 are respectively distributed on the upper and lower sides of the longitudinal axis L2 of the driving shaft, the electromagnetic force forms an electromagnetic torque M1 on the transducer 7. Since the current I through the first drive coil 121 and the second drive coil 122 is alternating, the direction of the electromagnetic torque M1 on the transducer 7 is correspondingly alternating, the transducer 7 being subjected to a reciprocating couple from the drive coils 121, 122. Thus, the electromagnetic force is applied to both sides of the longitudinal axis L2 of the driving shaft, and the elastic members 104 and 105 are the main components to receive the electromagnetic force. Assume that in the initial state, 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 bend and elastically deform, and at this time, the edges of the first elastic members 104A and 104B that are fixed to the frame fastening arms 113 are fixed ends or stationary ends. In order for the first resilient element 104 to elastically deform in a reciprocating bending under the action of the electromagnetic moment M1 to cause the transducer 7 and the cleaning assembly to move in resonance, the angle between the plane of the resilient elements of the first resilient elements 104A and 104B and the median plane P is less than 30 degrees. The second elastic members 105A and 105B are also elastically deformed in a reciprocating bending by the electromagnetic moment M1, causing the transducer 7 and the cleaning assembly to perform a resonant motion. Thus, the second elastic members 105A and 105B are fixedly coupled to the edge 109 of the driving shaft 101 as a movable end or a resonance end of elastic deformation, and the second elastic members 105A and 105B are fixedly coupled to the edge 108 of the frame projection 111 as a fixed end or a stationary end of elastic deformation.
In the first embodiment, the materials of the elastic members 104A and 104B are metals or mainly composed of metals, the material of the second elastic member 105A may be plastic or metal, and the material of the second elastic member 105B is plastic or mainly composed of plastic components. In the present invention, for convenience of description, the elastic member is generally indicated as metal or plastic, but it should be understood that the elastic member may be a composite of metal and plastic. When the stiffness coefficient of the elastic element is more than 60% from metal, the elastic element is called to be mainly composed of metal; when the stiffness coefficient of the elastic member is more than 60% from plastic, the elastic member is said to be mainly composed of plastic. When neither the metal nor the plastic contributes to a stiffness coefficient greater than 60% of the stiffness coefficient of the spring, the spring is a metal and plastic composite.
When 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 following analysis is made by taking the elastic member materials 105A and 105B as examples of plastic.
According to the principle of solid mechanics, under the bending elastic deformation state, the elastic part is equivalent to a linear spring, taking a cuboid elastic part as an example, the stiffness coefficient of the equivalent linear spring of the elastic part is as follows:
K＝3*E*Iz/(a3),
wherein E is the modulus of elasticity of the material, IzWhich is the moment of inertia of the elastic member corresponding to the driving force or driving moment, a is the distance of the driving force at the point of application of the elastic member to the edge 106 of the elastic member 104 or the edge 108 of the elastic member 105, which is stationary relative to the handle housing. A of the first elastic members 104A and 104B is a first elastic member a1A of the second elastic members 105A and 105B is a second elastic member a2. The first elastic members 104A and 104B have a spring stiffness corresponding to a first elastic member stiffness K1The spring stiffness coefficient corresponding to the second elastic members 105A and 105B is the second elastic member stiffness coefficient K2。
In the first embodiment, the elastic modulus E of the material of the first elastic members 104A and 104B is preferably1Greater than the modulus of elasticity E of the material of the second elastic members 105A and 105B220 times of the total weight of the powder. If the material of the first elastic members 104A and 104B is stainless steel, the elastic modulus E1196GPa, the material of the second elastic members 105A and 105B is POM, modulus of elasticity E2It was 2.5 GPa. The moment of inertia of the first elastic members 104A and 104B with respect to the electromagnetic torque M1 is a first elastic member moment of inertia IZ1Second, secondThe moment of inertia of the elastic members 105A and 105B with respect to the electromagnetic torque M1 is the second elastic member moment of inertia IZ2. According to solid mechanics, the moment of inertia of the cuboid is as follows:
IZ＝b*h*h*h/12,
wherein b is the width corresponding to the elastic member, and h is the thickness corresponding to the elastic member. In the first embodiment, the first elastic members 104A and 104B preferably have a moment of inertia IZ1B is 1.3mm, and the second elastic members 105A and 105B have a moment of inertia IZ2B in (1) is 3.5mm, and the first elastic members 104A and 104B have a moment of inertia IZ1H in (1) is 0.16mm, and the second elastic members 105A and 105B have a moment of inertia IZ2H in (1) is 0.3 mm. Referring to the second elastic member 105B at the upper left corner of FIG. 7 and the first elastic member 104B, the second elastic member a, at the left side of FIG. 72*cos(β1-α1) Greater than or equal to the first elastic part a1. In the first embodiment, β1Is 90 degrees, alpha1Is 60 degrees. It is apparent that the angle of the first spring plane relative to the cleaning element longitudinal axis L1 is angle β. The angle of the plane of the second resilient member with respect to the longitudinal axis of the cleaning element is angle α, angle β 1 is greater than angle α 1, the edge 107 of the first resilient member is fixedly connected to the transducer housing portion 112 enveloping the drive shaft, the other edge 106 of the first resilient member is fixedly connected to the housing fastening arm 113, the edge 109 of the second resilient member is fixedly connected to the transducer housing portion 112 enveloping the drive shaft, and the other end of the second resilient member is fixedly connected to the housing protrusion 111, thereby ensuring that a of the second resilient member is2Is larger than the first elastic part a1. Calculated E of the first elastic member1*Iz1/(a1 3) E is larger than the second elastic member2*Iz2/(a2 3) 6.8 times of the first elastic member stiffness coefficient K1Greater than the stiffness coefficient K of the second elastic member26.8 times of the total weight of the powder. In the first embodiment, the equivalent mass of the vibrating body of the transducer 7 and the cleaning assembly relative to the longitudinal axis L2 of the drive shaft is MmThe natural frequency of the vibrating body is fnThen, then
Figure DEST_PATH_GDA0003233282920000141
Wherein KnAll of the second spring stiffness coefficients are added to the sum of all of the first spring stiffness coefficients. The sum of the stiffness coefficients of the first elastic member is K1tThe sum of the stiffness coefficients of the second elastic member is K2t。
When the driving frequency f0At a frequency equal to the natural frequency f of the machinenWhen the mechanical part is in forced resonance motion. When the drive coil is passed through an alternating current I with a frequency f0, the transducer 7 and the cleaning assembly are subjected to a frequency f0Electromagnetic force, frequency f of driving force0Between the natural frequency f of the transducer 7nBetween 85% and 115%. Frequency f of the driving force in general, according to the principle of simple harmonic vibration0At the natural frequency f of the machinenBetween 85% and 115%, the mechanical part can be considered to be in forced resonance motion, and the resonance motion and the electrical energy conversion of the resonance motion into mechanical energy are highly efficient. In the resonant motion of the transducer 7 and the cleaning assembly, the elastic member consumes a part of energy due to the action of the internal force of the material, which is equivalent to the consumption of energy by the internal resistance of the material, and the part of energy is expressed by the phenomenon that the material of the elastic member generates heat, and the temperature rise of the material is higher when the internal resistance of the material is higher with the lower elastic modulus. Therefore, the first elastic members 104A and 104B are mainly made of metal, the first elastic members have a high elastic modulus, the second elastic members 105A and 105B are mainly made of plastic, the elastic modulus of the second elastic members 105A and 105B is small, and the heat dissipation effect of the metal material is much better than that of the plastic material. The temperature rise of the first elastic members 104A and 104B is much lower than the temperature rise of the second elastic members 105A and 105B in the resonant motion of the transducer 7 and the cleaning assembly. The increase in temperature decreases the modulus of elasticity of the material of the elastic member, thereby decreasing the stiffness coefficient of the elastic member. In the embodiment where the second resilient members 105A and 105B are plastic, the temperature rise of the first resilient members 104A and 104B has a limited, and thus negligible, effect on the stiffness of the first resilient members, and the temperature rise of the second resilient members 105A and 105B has a greater effect on the stiffness of the second resilient members, and in order to keep the transducer 7 and the cleaning assembly in resonance motion during the working cycle, the above equations and principles are combined to analyzeAssuming that the angle coefficients of the second elastic members 105A and 105B decrease to zero due to temperature rise, when (K)1t+K2t)2/(K1t)2<1.15/0.85, when K is1t>6.13K2tAt all times, the transducer 7 and cleaning assembly are in resonant motion during the duty cycle. The spring stiffness in the natural frequency of the transducer 7 and the cleaning assembly is mainly determined by the stiffness of the first elastic members 104A and 104B. In the first embodiment, the sum of all first spring stiffness coefficients is greater than 6.13 times the sum of all second spring stiffness coefficients, thereby ensuring that the transducer is always at an efficient resonant state during the duty cycle.
In other alternative embodiments, the material of the proximal spring 105A may be or consist essentially of metal, the material of the distal spring 105B may be or consist essentially of plastic, and the sum of all first spring stiffness coefficients plus the sum of all proximal second spring stiffness coefficients is greater than 6.13 times the sum of all second lower spring stiffness coefficients. In this case, the material of the first elastic members 104A and 104B is metal, the material of the second elastic member 105B is plastic, and the elastic modulus of the first elastic members 104A and 104B is 20 times or more the elastic modulus of the second elastic member 105B. The first spring plane is at an angle beta relative to the longitudinal axis of the cleaning element. The second spring plane is at an angle α relative to the longitudinal axis of the cleaning element, and the angle β is greater than the angle α.
Figure 8 illustrates a force diagram of the elastomeric member and cleaning assembly along the longitudinal axis according to a preferred embodiment of the present invention. As shown in fig. 8, the pressing force F1 exerted on the cleaning member 3, 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 force F1 exerted on the cleaning element 3 is substantially parallel to the cleaning element longitudinal axis L1. In the present invention, the planes of the second resilient members 105A and 105B form an angle α of less than 80 degrees, specifically 60 degrees, with respect to the longitudinal axis L1 of the cleaning element. When a pressure force F1 is applied to the cleaning element 3, the second elastic members 105A and 105B can generate a force component parallel to the longitudinal axis L1 of the cleaning element, since the edge 109 of the second elastic members 105A and 105B is fixed to the transducer housing portion 112 and the other edge 108 is fixed to the housing protrusion 111, the direction of the equivalent force F2 on the second elastic member 105A is opposite to the direction of the pressure force F1, the direction of the equivalent force F3 on the second elastic member 105B is the same as the direction of the pressure force F1, the second elastic member 105A is in a stretched state to generate the equivalent force F2, and the second elastic member 105B is in a stretched state to generate the equivalent force F3, according to the principles of moment balance and force balance. In addition, the component of the pressure force F1 perpendicular to the plane of the second elastic members 105A and 105B causes a compressive bending deformation of the second elastic members, which additionally increases the internal stress of the second elastic members, possibly causing yielding of the second elastic members, which in turn causes a drastic change in the natural frequency of the transducer 7, thereby causing the transducer to fail. In the present invention, the angle α is less than 80 degrees and not less than 0 degree. More preferably, the angle α is equal to or less than 60 degrees and equal to or greater than 0 degrees, so as to effectively reduce the component force of the pressure force F1 in the direction perpendicular to the plane of the second elastic members 105A and 105B, thereby reducing the pressure bending deformation of the second elastic members 105A and 105B caused by the pressure force F1.
Importantly, the inventors have found that the distance between the equivalent force F2 on the second resilient element 105A and the equivalent force F3 on the second resilient element 105B is particularly important for moment balancing, and that, after a number of experiments, in combination with the feasibility of the manufacturing process, the centerline L3 of the second resilient element 105A is more than 3.5mm from the centerline L4 of at least one of the second resilient elements 105B in the direction along the longitudinal axis L2 of the drive shaft, which is the centerline of the plane of the second resilient element lying in the plane of the second resilient elements 105A and 105B and pointing from the frame projection 111 towards the transducer frame portion 112 of the envelope drive shaft, and which can also be understood as the centerline of the plane of the second resilient element lying in the plane of the second resilient elements 105A and 105B and pointing from the transducer frame 110 towards the transducer frame portion 112 of the envelope drive shaft. Since the center line L3 of the at least one proximal second elastic element is more than 3.5mm away from the center line L4 of the at least one distal second elastic element, it is possible to avoid torsional deformation of the second elastic element 105 caused by the pressure F1 on the cleaning element 3, and avoid excessive stress of the second elastic element, and thus avoid failure of the transducer 7, compared to only one second elastic element 105A.
With continued reference to FIGS. 8, 9, and 10, in the present invention, the moment M generated by cleaning element pressure F1 and cleaning element pressure F1 can be balanced by stretching or compressing the material of second elastic member 105A and second elastic member 105BF. The point of action of the proximal second resilient member 105A on the drive shaft 101 is O1, the moment M generated by the cleaning element pressure F1FIs the torque created by cleaning element pressure F1 relative to point O1, torque MFIs clockwise. According to the force analysis and moment balance in FIG. 8, the second elastic member 105A and the second elastic member 105B are stretched, and the distance Y that the second elastic member 105A is stretched is1The second elastic member 105B material is stretched by a distance Y2. According to Hooke's law, Y2Proportional to (F3/E), the equivalent force F3 on the second elastic member 105B has a balance moment MFAnd E is the modulus of elasticity of the material of the second elastic member 105B. In the present invention, the material of the second elastic member 105B is plastic, the material of the first elastic member 104 is metal, and the elastic modulus of the material of the first elastic member 104 is twenty times or more the elastic modulus of the material of the second elastic member 105B. Thanks to the utility model, a plastic second elastic element 105B is inventively introduced, according to Y2Proportional to (F3/E), under the same cleaning element pressure F1 and under the same F3 conditions, the plastic second elastic member 105B can generate more than 20 times larger distance Y that the material of the second elastic member 105B is stretched than the metal second elastic member 105B2。
In other alternative embodiments, the second resilient members 105A and 105B may be rotated 180 degrees about the drive shaft longitudinal axis L2, Y2Becomes the material of the second elastic member 105B compressed by the distance, and thus, Y2The distance the material of the second elastic member 105B is stretched or compressed.
Advantageously, a drive shaft based on the proximal and distal springs 105A, 105B and the transducer housing can constitute a pressure alarm mechanism for the power toothbrush configured to sound an alarm when the cleaning force exerted on the brushhead exceeds a predetermined value. The pressure warning mechanism comprises a sensing device including at least one movable part arranged to be drivenOn the magnet or transducer housing at the distal end of the shaft, preferably at the distal end of the magnet or transducer housing along longitudinal axis L2, the movable member produces a third displacement Y in the second direction when a cleaning force F1 is applied proximally3When the cleaning force F1 exceeds the maximum pressure F1MAt this time, the displacement of the movable member causes an alarm device of the pressure alarm mechanism to generate an alarm indication.
In connection with the example of fig. 8, second resilient member 105B and the portion of the drive shaft in this position are subject to a displacement Y in the opposite direction to cleaning element pressure F1 under cleaning element pressure F12. The portion of the transducer housing 110 and the magnet that is further away from the cleaning element 3 than the second resilient member 105A, under the action of the cleaning element pressure F1, produces a displacement Y in the opposite direction to the cleaning element pressure F13. The displacement Y is due to the fact that the second resilient member 105B and the second resilient member 105A are fixedly attached to the transducer housing portion 112 enveloping the drive shaft3And displacement Y2In direct proportion.
In the first embodiment, as shown in fig. 4, the movable member includes a frame follower 114 disposed at the rear of the transducer frame 110 away from the cleaning element 3, the frame follower 114 is convex, the second elastic member 105B is in an elastically deformed state by the cleaning element pressure F1, and the frame follower 114 generates a displacement Y in the opposite direction to the cleaning element pressure F13Displacement Y3As the cleaning element pressure F1 increases, it increases. The circuit board 4 is respectively provided with an LED light source 402 and a photosensitive device 401 as sensing devices at two sides adjacent to the rack follower block 114, when the light flux received by the photosensitive device 401 changes, the equivalent resistance of the photosensitive device 401 changes correspondingly, and the circuit board 4 senses the change of the pressure F1 by detecting the equivalent resistance of the photosensitive device 401. Displacement Y of the frame follower block 114 when the user increases the pressure F1 applied to the cleaning element 33The larger the size, the more the frame follower 114 enters the gap between the light source 402 and the photosensor 401, the less the light flux from the light source 402 obtained by the photosensor 401, the larger the equivalent resistance of the photosensor 401, and the circuit board 4 detects that the photosensor is operatedThe equivalent resistance of the piece 401 is increased, the cleaning element pressure F1 is identified, when the cleaning element pressure F1 reaches a preset threshold value, the electric toothbrush can remind the user that the pressure F1 on the cleaning element is too high in a sound, light, vibration and other modes, and remind the user to reduce the pressure F1 applied to the cleaning element. Similarly, the displacement Y of the frame follower 114 when the user lowers the pressure F1 applied to the cleaning element 33The smaller the size, the smaller the gap between the light source 402 and the photosensor 401 is, the larger the light flux from the light source 402 that can be obtained by the photosensor 401, the smaller the equivalent resistance of the photosensor 401 detected by the circuit board 4, the recognition of the larger the cleaning element pressure F1 is realized, and when the cleaning element pressure F1 is smaller than the preset threshold value with too large pressure, the electric toothbrush is prompted to exit by sound, light, vibration, etc.
In the embodiment according to the utility model, the displacement Y is effectively amplified by the introduction of the lower second elastic element 105B, which is plastic or mainly made of plastic3I.e., effectively amplifying the displacement of the portion of the transducer housing 110 and the magnet that is farther from the cleaning element 3 relative to the second resilient member 105A in the direction opposite to the cleaning element pressure F1 under the cleaning element pressure F1.
The embodiment of the alarm mechanism may be modified as appropriate, for example, a through hole may be provided in the frame follower block 114, when the cleaning element pressure F1 is zero, no or a small amount of light from the light source 402 passes through the through hole of the frame follower block 114 and 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 being incident on the photosensitive surface of the photosensitive device 401, and at this time, the equivalent resistance of the photosensitive device 401 is relatively large. When the cleaning element pressure F1 becomes larger, more light from the LED402 passes through the through hole of the frame follower block 114 and is incident on the photosensitive surface of the photosensitive device 401, and at this time, the equivalent resistance of the photosensitive device 401 becomes smaller, thereby realizing the detection of the cleaning element pressure F1 by the circuit board 4.
In the above embodiment, the rack follower 114 is convex with respect to the surface of the magnet, but the rack follower 114 may be concave or flatThe shape or curved surface shape being obtained by displacement Y of one of the surfaces3At least one face of the follower block 114 is brought close to or away from the photosensor 401, so that the incidence angle at which the photosensor 401 receives light from the light source 402 changes, thereby causing the luminous flux on the photosensor 401 to change monotonously with a monotonous change in the cleaning member pressure F1.
It is also possible to use a magnet as the movable part of the sensor device, using the displacement Y of the magnet away from the cleaning element3A magnetic field induction device such as a Hall element or a coil, a displacement Y of the magnet, is mounted on the wiring board 43The change of the magnetic field intensity on the magnetic field induction device is caused, so that the change of the voltage value of the magnetic field induction device is formed, and the detection of the pressure F1 of the cleaning element by the circuit board 4 is realized.
Furthermore, the transducer device is preferably set with an activation pressure F4. Specifically, the portion of the transducer housing 110 and the magnet that is further from the cleaning element than the second resilient member 105A may be spring loaded, with the proximal and distal second resilient members being capable of displacement Y only when the cleaning element pressure F1 is greater than the cleaning element activation pressure F42And displacement Y3。
Due to the increase of the pressure force F1, F2, F3 with respect to the force of the elastic member becomes large, and the increased F2, F3 give the second elastic member to lose its elasticity. In the utility model, the transducer device is also provided with a pressure F1 limited to a maximum pressure F1MI.e. the transducer device is constructed to have a maximum pressure F1M. In the embodiment of fig. 9, the circuit board has a through hole 403, and the through hole 403 allows the frame follower block 114 to pass through to contact the handle housing. When the pressure F1 on the cleaning element 3 is greater than or equal to the maximum cleaning element pressure F1MAt this time, the frame follower 114 contacts the handle housing, which constitutes a maximum pressure limiting portion that limits further movement, displacement Y, of the frame follower 1142And displacement Y3No longer becoming larger, thereby ensuring that the second elastic piece is always in the elastic deformation range. Only when the pressure F1 is less than the maximum pressure F1MAnd greater than cleaning element activation pressure F4, followingMonotonic variation of pressure F1, displacement Y2And displacement Y3Monotonously changes.
For a power toothbrush, preferably, the cleaning element maximum pressure F1MIs in the range of 2.5N to 10N, and the cleaning member activation pressure F4 is 0N or more and 2N or less. As the pressure on the cleaning element F1 exceeds the cleaning element maximum pressure F1MAnd continues to increase monotonically, the handpiece envelope, or a part stationary relative to the handpiece envelope, constrains the transducer 7 to cause a displacement Y2And displacement Y3No longer monotonically.
Based on the above resonance analysis and mechanical analysis, the pressure F1 on the cleaning element 3 causes additional bending deformation of the first elastic members 104A and 104B, but since the present invention introduces the second elastic members 105A and 105B to balance the force and moment caused by the pressure F1 on the cleaning element 3, the additional bending deformation of the first elastic members 104A and 104B caused by the pressure F1 on the cleaning element 3 is greatly reduced, so that the transducer 7 can operate in a resonance state for a long life, and the second distal elastic member 105B has a limited influence on the spring stiffness coefficient in the natural frequency of the transducer, making the frequency adjustment of the transducer 7 easy. The first elastic members 104A and 104B and the second elastic members 105A and 105B may be completed by an injection molding process, and the transducer 7 is easily manufactured.
As a modification of the first embodiment, there may be only one first elastic member, such as only one upper first elastic member 104A located on the left side of the drive shaft in fig. 4, or only one lower first elastic member 104B located on the right side of the drive shaft in fig. 4, one first elastic member still satisfying the above-mentioned requirements for the combination of first elastic members, and one first elastic member still achieving the object of the present invention.
As another modification of the first embodiment, there may be only two second elastic members, which include one second elastic member 105A and one second elastic member 105B, such as only one second elastic member 105A located on the left side of the drive shaft in fig. 4, and only one second elastic member 105B located on the right side of the drive shaft in fig. 4, the two second elastic members being located on both sides of the median plane P and also on both sides of a vertical plane that is perpendicular to the median plane P and includes the longitudinal axis L2, respectively. The resilient assembly of a second resilient member 105A and a second resilient member 105B still meets the requirements of the second resilient member combination of the present invention and achieves the objects of the present invention.
In other variations, the second elastic elements may be located on the same side of the median plane P, or may 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 utility model, in which the magnet coil arrangement of the transducer device has a different structure from the magnet coil arrangement of the first embodiment. As shown in fig. 10 and 11, the drive coil 221 is arranged centrally with respect to the drive shaft longitudinal axis L2, the magnets 202 and 203 are respectively disposed on both sides of the drive coil 221, the transducer housing 110 extends laterally and downwardly about the drive shaft longitudinal axis L2 to form two support arms 115, the two magnets are respectively fastened to the respective support arms 115, and the magnetic field generated by the magnets passes through the drive coil, and the object of the present invention can still be achieved by the arrangement of the magnets 202 and 203 and the drive coil 221 as shown in fig. 10 and 11, similar to the above analysis.
Fig. 12 and 13 show perspective views of a transducer according to a third embodiment of the utility model. As shown in fig. 12 and 13, a hollow cylindrical magnet 302 is fastened to the drive shaft 101, the drive coils 321, 322, 323, 324 are arranged around the outside of the hollow cylindrical magnet, and the magnetic field formed by the magnets passes through the drive coils, and the object of the present invention can still be achieved by the arrangement of the magnets and the drive coils as shown in fig. 12 and 13, which is similar to the above analysis.
Of course, the position of the magnets and the drive coils and the elastic members relative to the cleaning member 3 may be varied, for example, the magnets and the drive coils are closer to the cleaning member 3, or the magnets and the drive coils are interposed between two second elastic members.
In the known transducer device of a cleaning appliance, the fixed or stationary end of the elastic element is located on the longitudinal axis of the drive shaft, acnFor driving the driving shaftThe distance of the longitudinal axis is also a in the calculation formula of the stiffness coefficient of the elastic element, and the couple of the driving force is the driving force multiplied by acnAnd maintaining a small driving force to ensure a sufficient couple, acnIs sufficiently large. In order to maintain the stiffness coefficient of the elastic member at a suitable level, the elastic member is dimensioned slightly larger. Because the other end of the elastic element is fixedly connected with the transducer transmission arm, the existing transducer devices have larger sizes.
In the present embodiment, the first elastic member 104 thus receives the electromagnetic torque M1 on the drive shaft. Two frame fastening arms 113 are distributed on the transducer frame 110, the two frame fastening arms 113 are respectively fixedly connected with the other edges 106 of the corresponding first elastic members 104A and 104B, the edges 107 of the first elastic members 104A and 104B are fixedly connected with the transducer frame part 112, the transducer frame part 112 enveloping the driving shaft envelops part of the driving shaft 110, and the first elastic members 104A and 104B extend between the frame fastening arms 113 and the transducer frame part 112 enveloping the driving shaft. The distance from the longitudinal axis L2 of the drive shaft to the edge 106 of the first resilient member is a in the calculation formula for the stiffness coefficient of the resilient member. The distance from the longitudinal axis L2 of the drive shaft to the other end 106 of the first resilient member is not directly related to the moment arm of the electromagnetic couple M1, and therefore the distance from the longitudinal axis L2 of the drive shaft to the edge 106 of the first resilient member can be sufficiently small, the size of the resilient member can be smaller, and the overall size of the transducer 7 can be smaller, thereby achieving miniaturization of the cleaning device.
In the first embodiment, the displacement Y caused by the pressure F1 on the cleaning element is achieved by the offset distribution of the second elastic member 105A and the plastic second elastic member 105B along the longitudinal axis L2 of the drive shaft when the transducer 7 is in resonance3Thereby enabling detection of the cleaning element pressure F1. Detection of cleaning element pressure F1 may be desirable in some cleaning appliances, such as power toothbrushes, where excessive cleaning element pressure F1 may injure the gums, and it may be necessary to alert the user to the level of pressure F1. In other applications, however, the cleaning implement may not be as demanding as the cleaning element pressure F1 can be sensed, but it is desirable that the transducer and cleaning assembly be within the resonant range, and that the pressure F1 on the cleaning element be greater.To this end, the present invention provides another solution to replace the material of all the second elastic members in the above-described embodiments with metal, i.e., a fourth embodiment of the transducer device as shown in fig. 14, 15, 16, 17.
In the fourth embodiment, the transducer 7' comprises a drive shaft 501, two proximal springs 505A distributed along the drive shaft longitudinal axis L2 distributed along the drive shaft longitudinal axis L2, two distal springs 505B distributed along the drive shaft longitudinal axis L2, a magnet 502 and a magnet 503, and a transducer carrier 510. Both magnets 502 and 503 are fixed to the transducer housing 510. The material of the transducer housing 510 is plastic, the drive shaft 501, the proximal spring 505A and the distal spring 505B are coupled together by the transducer housing 510, and the magnets 502 and 503 are secured to the rear of the transducer housing, distal from the cleaning elements, by glue or screws or injection molding.
In the fourth embodiment, the elastic assembly of the transducer 7' should comprise at least one proximal elastic element 505A and one distal elastic element 505B, with one second proximal elastic element 505A and one second distal elastic element 505B located on opposite sides of a median plane P in which the longitudinal axis L2 of the drive shaft lies. A proximal spring 505A and a distal spring 505B disposed on opposite sides of the median plane P are capable of withstanding electromagnetic forces from opposite sides of the drive shaft longitudinal axis L2, thereby allowing the transducer to be balanced and noise and shock reduced.
In a fourth embodiment of the utility model, 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 having different inclination angles and being staggered back and forth along the longitudinal axis L2, wherein the proximal elastic members 505A are closer to the proximal end of the drive shaft 501 than the distal elastic members 505B.
Similar to the structure in the first embodiment, the transducer housing 510 includes a housing portion 512 that encloses the drive shaft and a housing fastening arm 513, with a housing protrusion 511 protruding from the housing fastening arm 513. The proximal elastic member 505A and the distal elastic member 505B are fixedly coupled to the frame protrusion 511 and the frame portion 512 surrounding the driving shaft, respectively.
As shown in fig. 15, four frame protrusions 511 are distributed on the transducer frame 510, the four frame protrusions 511 are respectively fixedly connected with the edges 508 of the corresponding elastic members 505A and 505B, the other edges 509 of the elastic members 505A and 505B are fixedly connected with the transducer frame portion 512 enveloping the drive shaft 501, and the elastic members 505A and 505B extend between the frame protrusions 511 and the transducer frame portion 512 enveloping the drive shaft. In other alternative embodiments, the frame protrusion 511 may be replaced by a thickened frame fastening arm 513 without affecting the practice of the utility model.
The elastic members 505A and 505B are substantially rectangular parallelepipeds, the distance from the elastic members 505A and 505B at the frame projection 511 to the transducer frame portion 512 enveloping the drive shaft being the length of the elastic members, the distance of the elastic members 505A and 505B along the longitudinal axis of the drive shaft being the width of the elastic members, and the other side of the rectangular parallelepipeds being the thickness of the elastic members. The plane formed by the length and width of each of the elastic members 505A and 505B is an elastic member plane. The plane of the spring is the plane joining the frame projection 511 and the transducer frame portion 512 enveloping the drive shaft, and preferably the plane is at an angle of less than 30 degrees to the drive shaft longitudinal axis L2. In this embodiment, the angles of the plane of the four resilient members 505A and 505B and the longitudinal axis L1 of the cleaning element are δ 1, δ 2, δ 3, δ 4, respectively. In the present embodiment, δ 1, δ 2, δ 3, δ 4 are all equal to 60 degrees, in other words, the included angle between the plane of the elastic members 505A and 505B and the median plane P is 30 degrees. It should be understood that in other alternative embodiments, δ 1, δ 2, δ 3, δ 4 may take different values.
In the fourth embodiment, the material of the proximal elastic member 505A and the distal elastic member 505B is metal. The elastic members 505A and 505B may be formed as shown in fig. 16 as two elastic bodies independent of each other along the longitudinal axis, each including two elastic members symmetrically arranged, each of the independent elastic bodies being formed with a through hole in a middle portion thereof and through holes at both ends thereof for fixing the elastic body to the longitudinal axis of the transducer frame. In other alternative embodiments, four separate spring assemblies may be combined to form the spring assembly. Of course, other arrangements of the transducer springs are possible and would fall within the scope of the present invention.
As shown in fig. 14, the drive shaft 501 is enveloped at the rear of the transducer housing remote from the cleaning elements, and the magnets 502 and 503 are symmetrically distributed on both sides of the drive shaft longitudinal axis L2. The first and second drive coils are located on opposite sides of the drive shaft longitudinal axis L2, respectively, and there is no relative movement between the first and second drive coils and the handle housing. The magnets 502 and 503 have opposite magnetic poles facing the same drive coil, for example, the magnetic pole of the magnet 502 facing the second drive coil is S-pole, and the magnetic pole of the magnet 503 facing the second drive coil is N-pole. The direction of the current I in the first and second drive coils is perpendicular to the direction of the magnetic lines of force inside the magnets 502, 503.
The analysis of the motion of the transducer 7' in the fourth embodiment is similar to the analysis of the motion of the transducer 7 in the first embodiment and will not be described again.
In a fourth embodiment according to the present invention, the material of the proximal and distal elastic members 505A and 505B is metal. According to the principle of solid mechanics, in the bending elastic deformation state, the elastic member is equivalent to a linear spring, taking a cuboid elastic member as an example, the stiffness coefficient K of the elastic member equivalent linear spring is 3E Iz/(a3),
Wherein E is the modulus of elasticity of the material, IzThe moment of inertia of the elastic element, which corresponds to the driving force or driving moment, a is the distance of the driving force from the point of action of the elastic element to the other edge 508 of the elastic element, which corresponds to the rest of the grip housing.
At the driving frequency f0Equal to the natural frequency f of the machinenWhen the mechanical part is in forced resonance motion. When the drive coil passing frequency is f0With an alternating current I, the transducer 7' and the cleaning assembly are subjected to a frequency f0Electromagnetic force, frequency f of driving force0Between the natural frequency f of the transducer 7nBetween 85% and 115%. Frequency f of the driving force in general, according to the principle of simple harmonic vibration0At the natural frequency f of the machinenBetween 85% and 115%, the mechanical part can be considered to be in forced resonance motion, and the resonance motion and the electrical energy conversion of the resonance motion into mechanical energy are highly efficient.
Similarly, referring to fig. 8, the pressure applied to the cleaning element 3 is F1, the equivalent force on the proximal elastic member 505A is F2, and the equivalent force on the distal elastic member 505B is F3. The pressure force exerted on the cleaning element 3 is F1 parallel to the cleaning element longitudinal axis L1, i.e. perpendicular to the median plane P. Referring to fig. 17, in a fourth embodiment, the plane of the resilient members 505A and 505B is at an angle δ relative to the longitudinal axis L1 of the cleaning element, the angle δ being less than 80 degrees, in this embodiment the angle δ being 60 degrees. When a pressure force F1 is applied to the cleaning element 3, the elastic members 505A and 505B generate a component force parallel to the longitudinal axis L1 of the cleaning element, because one edge 509 of the elastic members 505A and 505B is attached to the transducer housing portion 512 enveloping the drive shaft and the other edge 508 is attached to the housing protrusion 511, according to the principles of moment balance and force balance, wherein the direction of the equal-effective force F2 on the proximal elastic member 505A is opposite to the direction of the pressure force F1, the direction of the equal-effective force F3 on the distal elastic member 505B is the same as the direction of the pressure force F1, the proximal elastic member 505A is in tension to generate the equal-effective force F2, and the distal elastic member 505B is in tension to generate the equal-effective force F3. The force component of the pressure force F1 perpendicular to the plane of the elastic members causes compressive bending deformation of the elastic members 505A and 505B, which additionally increases the internal stress of the elastic members, possibly causing yielding of the elastic members, and thus a drastic change in the natural frequency of the transducer 510, which may cause the transducer to fail. In order to avoid failure of the transducer, the angle delta is less than 80 degrees and greater than or equal to 0 degree. More preferably, the angle δ is equal to or less than 60 degrees and equal to or greater than 0 degree, so as to effectively reduce the component force of the pressure force F1 perpendicular to the plane of the third elastic element, and reduce the pressure bending deformation of the third elastic element caused by the pressure force F1.
Equally important, the distance between the equivalent force F2 on the proximal spring 505A and the equivalent force F3 on the distal spring 505B is particularly important for moment balancing, and through a number of experiments, in combination with the feasibility of the manufacturing process, the centerline L5 of the proximal spring is more than 3.5mm from the centerline L6 of the distal spring, which is the centerline of the second spring plane that lies in the plane of the springs and that is directed from the frame securing arms 513 toward the transducer frame portion 512 that envelopes the drive shaft, in a direction along the drive shaft longitudinal axis L2. As shown in FIG. 14, since the center line L5 of at least one third proximal elastic element is more than 3.5mm away from the center line L6 of the third distal elastic element, compared with only one proximal elastic element 505A, the torsional deformation of the elastic elements 505A and 505B caused by the pressure F1 on the cleaning element 3 can be avoided, and the excessive stress of the elastic elements can be avoided, thereby avoiding the failure of the transducer.
As a variation of the fourth embodiment of the present invention, there may be only two elastic members 505, and the two elastic members 505 include a proximal elastic member 505A and a distal elastic member 505B, such as only one proximal elastic member 505A located at the left side of the driving shaft in fig. 15 and only one elastic member 505B located at the right side of the driving shaft in fig. 15, which still satisfies the requirements of the present invention for the elastic member combination.
Similar to the analysis of fig. 10, 11, 12 and 13, the distribution of the magnets and the positions of the magnets are not described again. Various combinations of the above fall within the scope of the utility model.
It is apparent that the metallic proximal elastic member 505A and distal elastic member 505B in the fourth embodiment also enable recognition of the cleaning element pressing force F1, similarly to the first embodiment. Cleaning element maximum pressure F1 of pressure F1 on cleaning elementMIs in the range of 3N to 15N, and the cleaning member activation pressure F4 is 0N or more and 2.5N or less.
The transducer device according to the utility model introduces a resilient member arranged offset along the drive axis to balance the forces and moments caused by the pressure force F1 on the cleaning element, reducing the additional bending deformation of the resilient member caused by the pressure force F1 on the cleaning element 3, thus enabling the transducer to operate at resonance for a long life, while on the other hand ensuring that the transducer and the cleaning assembly are within resonance, the force that can be exerted on the cleaning element is greater. Further, with the arrangement of the elastic member according to the present invention, miniaturization of the cleaning device can be achieved.
The resonance state or the energy transfer efficiency in the resonance state is very high. In the existing driving structure using bearings (e.g., ball bearings), a constraint such as a bearing is provided to prevent the cleaning device from moving in addition to the rotation, but the constraint causes noise and energy loss, and increases the cost. According to the utility model, due to the reasonable arrangement of the elastic member and the permanent magnet, smooth rotation of the transducer can be realized, thereby eliminating the restriction members which are necessary to realize the rotation of the cleaning appliance. Because the permanent magnet is reasonably configured, the resultant force of the electromagnetic force on the transducer 7 and the transducer is approximately zero, and the torque is skillfully utilized as the torque on the transducer 7 and the transducer, a constraint structure can be omitted, so that the cleaning tool has a more compact structure, more stable rotation and less noise.
Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the utility model, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.

Claims (19)

1. A transducer arrangement for cleaning a care implement, comprising:
a transducer (7, 7') comprising a transducer housing (110, 510), a magnet attached to the transducer housing, a resilient assembly attached to the transducer housing, and a drive shaft (101, 501) having a proximal end and a distal end and being affixed to the transducer housing, wherein the drive shaft defines a longitudinal axis (L2) and extends through a median plane (P) and is substantially perpendicular to a direction of application of a cleaning force (F1) on the cleaning applicator; and
a drive coil (121, 122, 221, 321, 322, 323, 324) arranged relative to the magnet of the transducer (7, 7') and movable relative to the drive coil;
it is characterized in that the preparation method is characterized in that,
the resilient assembly comprising at least one proximal resilient member (105A, 505A) and at least one distal resilient member (105B, 505B) arranged in a biased arrangement along the longitudinal axis (L2), the proximal resilient member being closer to the proximal end of the drive shaft than the distal resilient member,
wherein the proximal resilient element (105A, 505A) and the distal resilient element (105B, 505B) have a first edge (109, 509) and a second edge (108, 508), respectively, the first edge (109, 509) being fixedly coupled to the drive shaft for movement therewith, the second edge (108, 508) constituting a fixed edge for the resilient deformation of the proximal resilient element and the distal resilient element, the respective planes of the proximal resilient element (105A, 505A) and the distal resilient element (105B, 505B) extending substantially radially outwardly from the longitudinal axis.
2. The transducer arrangement of claim 1,
the proximal and distal elastic elements each have a distance between centerlines of a width along the longitudinal axis of at least 3.5 mm.
3. The transducer arrangement of claim 1,
the plane of the proximal elastic element forms a first angle with respect to the median plane (P) and the plane of the distal elastic element forms a second angle with respect 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.
4. The transducing device according to any of the claims 1 to 3,
the proximal and distal elastic elements are located on opposite sides of the median plane or on the same side of the median plane, and the proximal and distal elastic elements are located on opposite sides or on the same side of a vertical plane perpendicular to the median plane (P) and containing the longitudinal axis, or in the direction of the vertical plane.
5. The transducer arrangement according to claim 1 or 2,
the proximal elastic member is plastic or metal or is mainly composed of plastic or metal, and the distal elastic member is plastic or is mainly composed of plastic.
6. The transducer arrangement according to any of claims 1 to 3, wherein the proximal elastic elements are symmetrically arranged in pairs about the longitudinal axis and the distal elastic elements are symmetrically arranged in pairs about the longitudinal axis.
7. The transducer arrangement of claim 1,
the spring assembly further comprises at least one further spring (104A, 104B) formed of metal and arranged offset along the longitudinal axis with respect to the proximal and distal springs, the angle between the plane of the metal spring and the median plane being smaller than the angle between the plane of the proximal and distal springs and the median plane;
the elastic modulus of the other elastic member is more than twenty times of the elastic modulus of the distal end elastic member.
8. The transducer arrangement of claim 1,
the transducer carrier comprising a transducer carrier portion (112) enveloping the drive shaft and a pair of carrier fastening walls (113) spaced from the drive shaft in a radial direction,
wherein the frame fastening wall (113) has an upper protrusion and a lower protrusion, the upper protrusion and the lower protrusion being offset on the frame fastening wall,
the first edge is secured to the transducer housing portion and the second edge is secured to the upper and lower bosses, respectively, of the housing fastening wall.
9. The transducer arrangement of claim 1,
the drive coil is arranged without relative movement with respect to the housing of the cleaning and care appliance and in the magnetic field generated by the magnet, the angle between the magnetic field lines generated by the magnet (102, 103, 202, 203, 302) and the direction of the current I in the drive coil (121, 122) is approximately 90 degrees,
wherein the pass frequency in the drive coil is f0Whereby the drive coil and the magnet interact to produce a reciprocating couple about a drive shaft longitudinal axis (L2), the reciprocating couple driving the transducer into resonance.
10. A pressure warning mechanism for a cleaning and care implement, comprising:
a drive shaft (101) defining a longitudinal axis and having a proximal end and a distal end, and a drive portion attached to the drive shaft from the distal end of the drive shaft, the proximal end producing a first displacement in a first direction when a cleaning force (F1) of a cleaning care implement is applied in the first direction,
a proximal resilient member (105A, 505A) having a first edge (109) fixedly coupled to the drive shaft for movement therewith, the proximal resilient member being positioned to form a fulcrum for the drive shaft;
a distal resilient member (105B, 505B) biased toward the distal end along a longitudinal axis relative to the proximal resilient member, a first edge (109) of the distal resilient member being fixedly coupled to the drive shaft for movement therewith, the drive shaft at the location of the first edge of the distal resilient member being displaced in a second direction opposite the first direction upon application of the cleaning force (F1) to the proximal end;
a sensing device comprising a fixed part and a movable part, the movable part being arranged on the drive part, the movable part being displaced in a third direction relative to the fixed part upon application of the cleaning force (F1) to the proximal end, the cleaning force (F1) exceeding a maximum pressure (F1)M) When the movable part is in operationThe displacement of the member relative to the fixed part causes an alarm device of the pressure warning mechanism to generate an alarm indication.
11. Pressure alarm mechanism according to claim 10,
the proximal elastic element (105A, 505A) and the distal elastic element (105B, 505B) each have a second edge (108, 508) opposite to the first edge, the second edges (108, 508) constituting fixation edges for the elastic deformation of the proximal elastic element and the distal elastic element,
wherein a distance between centerlines of the proximal and distal elastic members, respectively, along a width of the longitudinal axis is at least 3.5 mm.
12. Pressure alarm mechanism according to claim 10 or 11,
said longitudinal axis extending through a median plane and said median plane being substantially perpendicular to said cleaning force, the planes of said proximal springs forming a first angle with respect to said median plane (P) and the planes of said distal springs forming a second angle with respect to said median plane, wherein said first and second angles are equal to or greater than 10 degrees and equal to or less than 90 degrees,
wherein the proximal and distal elastic elements are located on opposite sides of the median plane or on the same side of the median plane, and the proximal and distal elastic elements are located on opposite sides or on the same side of a vertical plane perpendicular to the median plane (P) and containing the longitudinal axis, or in the direction of the vertical plane.
13. Pressure alarm mechanism according to claim 10,
the drive section including a magnet and a frame, the magnet being attached to the distal end of the drive shaft by the frame,
the movable member is further from the proximal resilient member than the proximal end of the drive shaft.
14. A pressure warning mechanism as claimed in claim 10, wherein the fixed part of the sensing means comprises a sensing device and a source, the sensing device and source being fixed with a gap therebetween, the moveable part comprising a blocking block moveable into the gap between the sensing device and the source,
wherein the inductive device and the emission source comprise at least one of an electrical, magnetic and photo-inductive device and an emission source.
15. A pressure warning mechanism as claimed in claim 14, wherein the sensing means and the emission source are provided on the housing of the cleaning and care implement or on a component fixed relative to the housing.
16. Pressure alarm mechanism according to claim 10, characterised in that it comprises a pressure limiting portion which limits the range of movement of the movable part such that the maximum pressure (F1)M) In the range of 2.5N to 15N,
wherein the maximum pressure limiting part is arranged on the shell of the cleaning and nursing tool or a part fixed relative to the shell.
17. The pressure alarm mechanism of claim 16,
the pressure alarm mechanism also comprises a driving coil which is arranged to have no relative movement relative to the shell of the cleaning and nursing appliance and is arranged in a magnetic field generated by the magnet of the driving part, an included angle between a magnetic line generated by the magnet (102, 103, 202, 203, 302) and a current I direction in the driving coil (121, 122) is about 90 degrees,
wherein an alternating current I of frequency f0 is passed through the drive coil, whereby the drive coil and the magnets interact to produce a reciprocating couple about a drive shaft longitudinal axis (L2), the reciprocating couple driving a transducer comprising the drive shaft, the proximal resilient member and the distal resilient member into resonance.
18. A cleaning and care implement comprising the transducer arrangement of any one of claims 1 to 9 or comprising the pressure warning mechanism of any one of claims 10 to 17, the cleaning and care implement comprising one of an electric toothbrush, an electric shaver, an electric face cleaner and an electric shower.
19. The cleaning implement of claim 18, characterized in that the transducer (7) and the cleaning element of the cleaning implement form a resonant body, the drive coil and the magnet interacting to generate a reciprocating couple about a drive shaft longitudinal axis (L2), the reciprocating couple driving the resonant body into resonance, the resonant body having a natural frequency fnAt a frequency f of said reciprocating couple0Between 85% and 115%.
CN202121448380.7U 2021-06-28 2021-06-28 Cleaning and nursing tool and energy conversion device and pressure alarm mechanism thereof Active CN216162590U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023274188A1 (en) * 2021-06-28 2023-01-05 上海携福电器有限公司 Cleaning and nursing appliance, and transducer device and pressure alarm mechanism therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023274188A1 (en) * 2021-06-28 2023-01-05 上海携福电器有限公司 Cleaning and nursing appliance, and transducer device and pressure alarm mechanism therefor

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