Casing, electronic equipment

Abstract

The disclosed embodiments relate to the field of electronic technology, and provide a housing and an electronic device that can significantly reduce noise and has a simple structure. The housing includes: a top and a bottom that are arranged opposite to each other, and an annular side portion that is arranged between the top and the bottom, and the top, the annular side portion and the bottom are sequentially connected to form a receiving cavity; the annular side portion includes at least one acoustic black hole structure, the outer surface of the acoustic black hole structure is a straight surface, and the inner surface of the acoustic black hole structure is a curved surface.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the field of electronic technology, and in particular to a casing and an electronic device. Background Art

[0002] Motor-driven electronic devices (such as water flossers, etc.) will inevitably generate noise during use. Excessive noise will affect user satisfaction and product market competitiveness. Therefore, it is particularly important to reduce the noise of such devices. Utility Model Content

[0003] The embodiments of the present disclosure provide a casing and an electronic device that can significantly reduce noise and have a simple structure.

[0004] According to some embodiments of the present disclosure, on one hand, an embodiment of the present disclosure provides a housing, comprising: a top and a bottom arranged opposite to each other, and an annular side portion arranged between the top and the bottom, wherein the top, the annular side portion and the bottom are sequentially connected to form a containing cavity;

[0005] The annular side portion includes at least one acoustic black hole structure, the outer surface of the acoustic black hole structure is a straight surface, and the inner surface of the acoustic black hole structure is a curved surface; the distance h(x) between the outer surface and the inner surface of the acoustic black hole structure along the first preset direction satisfies the curve equation: h(x)=(h1-h0)(|x| / l) m +h0, h1 is the maximum distance between the outer surface and the inner surface of the acoustic black hole structure along the first preset direction, h0 is the minimum distance between the outer surface and the inner surface of the acoustic black hole structure along the first preset direction, m is a constant and m≥2, |x| represents the absolute value of x;

[0006] The acoustic black hole structure includes an acoustic black hole plate, the first preset direction is a first dimension direction of the acoustic black hole plate, l is a half dimension value of the acoustic black hole plate along the first dimension direction, -l≤x≤l, and the first dimension direction is a width direction or a length direction of the acoustic black hole plate;

[0007] And / or, the acoustic black hole structure includes at least one acoustic black hole beam, the first preset direction is the length direction of the acoustic black hole beam, l is the length value of the acoustic black hole beam, 0≤x≤l or -l≤x≤0.

[0008] According to the housing provided by the embodiment of the present disclosure, the annular side portion includes a plurality of the acoustic black hole structures;

[0009] The acoustic black hole structure includes the acoustic black hole plate, the annular side portion further includes an annular plate, and the acoustic black hole plate is embedded in the annular plate; the second dimension direction of the acoustic black hole plate is consistent with the height direction of the housing;

[0010] When the first dimension direction is the width direction of the acoustic black hole plate, the second dimension direction is the length direction of the acoustic black hole plate; or, when the first dimension direction is the length direction of the acoustic black hole plate, the second dimension direction is the width direction of the acoustic black hole plate.

[0011] According to the casing provided by the embodiment of the present disclosure, the bottom includes a bottom plate; the acoustic black hole plate, the annular plate and the bottom plate of each acoustic black hole structure are integrally formed.

[0012] According to the casing provided by the embodiment of the present disclosure, the annular plate includes two first side plates and two second side plates, the first side plates and the second side plates are alternated in sequence and connected end to end; the size of the first side plate is larger than the size of the second side plate, and the acoustic black hole plate is embedded in the first side plate.

[0013] According to the housing provided by the embodiment of the present disclosure, the annular side portion includes a plurality of the acoustic black hole structures; the annular side portion includes an annular plate, and the acoustic black hole structure is arranged on the inner surface of the annular plate;

[0014] The acoustic black hole structure includes an acoustic black hole beam, and the length direction of the acoustic black hole beam is consistent with the height direction of the casing;

[0015] And / or, the acoustic black hole structure includes a plurality of the acoustic black hole beams connected in sequence along the height direction of the casing, and in the acoustic black hole structure, the ends with the largest thickness or the ends with the smallest thickness of any two adjacent acoustic black hole beams are connected.

[0016] According to the casing provided by the embodiment of the present disclosure, the bottom includes a bottom plate; the acoustic black hole beam, the annular plate and the bottom plate of each acoustic black hole structure are integrally formed.

[0017] According to the casing provided by the embodiment of the present disclosure, the acoustic black hole structure includes an acoustic black hole beam; the thickness of the portion where the acoustic black hole beam is connected to the bottom is greater than the thickness of the portion where the acoustic black hole beam is connected to the top.

[0018] According to the casing provided by the embodiment of the present disclosure, the annular plate includes two first side plates and two second side plates, the first side plates and the second side plates are alternated in sequence and connected end to end; the size of the first side plate is larger than the size of the second side plate, and the acoustic black hole beam is arranged on the inner surface of the first side plate.

[0019] According to the housing provided by the embodiment of the present disclosure, the housing also includes a damping layer; the damping layer is at least arranged on the inner surface of the part with the smallest thickness in the acoustic black hole structure.

[0020] According to some embodiments of the present disclosure, another aspect of the present disclosure provides an electronic device, including the above-mentioned casing.

[0021] According to the electronic device provided by the embodiment of the present disclosure, the electronic device is a water flosser;

[0022] The water flosser also includes a movement, a plurality of first fasteners and a plurality of second fasteners; the movement is disposed in a receiving cavity of the casing; the movement is connected to the top of the casing via the first fasteners, and the movement is connected to the bottom of the casing via the second fasteners.

[0023] According to the electronic device provided by the embodiment of the present disclosure, the first fastener includes a screw, the second fastener includes a vibration isolation pad and a positioning column, and the vibration isolation pad is arranged around the positioning column.

[0024] The embodiments of the present disclosure provide a casing and an electronic device, wherein the casing includes at least one acoustic black hole structure; a noise-generating component is disposed in the casing, and based on the acoustic black hole effect, the acoustic black hole structure can largely eliminate vibration wave energy, thereby significantly reducing noise and improving user experience; meanwhile, the casing has a simple structure and a low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings, and these exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise specified, the pictures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the traditional technology, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of a three-dimensional structure of a casing provided in an embodiment of the present disclosure;

[0027] Figure 2 for Figure 1 A schematic cross-sectional view of

[0028] Figure 3 for Figure 1 Schematic diagram of top view;

[0029] Figure 4A schematic diagram of a three-dimensional structure of another housing provided in an embodiment of the present disclosure;

[0030] Figure 5 for Figure 4 A schematic diagram of a coordinate system for the longitudinal section of ;

[0031] Figure 6 for Figure 4 Schematic diagram of another coordinate system for the cross section;

[0032] Figure 7 for Figure 4 Schematic diagram of top view;

[0033] Figure 8 for Figure 4 A front view schematic diagram of

[0034] Fig. 9 A schematic diagram of a three-dimensional structure of another housing provided in an embodiment of the present disclosure;

[0035] Fig.10 for Fig. 9 A front view schematic diagram of

[0036] Fig.11 A schematic diagram of a three-dimensional structure of another housing provided in an embodiment of the present disclosure;

[0037] Fig.12 A schematic diagram of the three-dimensional structure of a water flosser provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the technical solutions of the present disclosure will be clearly and completely described below in combination with the specific embodiments of the present disclosure and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0039] In the description of the embodiments of the present disclosure, “at least one” means one or more, and “a plurality of” means two or more, unless otherwise clearly and specifically defined.

[0040] In the description of the embodiments of the present disclosure, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0041] In the description of the embodiments of the present disclosure, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0042] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] In the description of the embodiments of the present disclosure, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present disclosure. For example, if the device or element in the figure is inverted, then the element described as being "below" or "below" or "below" or "bottom" of other elements or features will be oriented "above" or "top" of the other elements or features. Therefore, the term "below" may cover both the above and below orientations depending on the context in which the term is used, which will be obvious to a person of ordinary skill in the art. The material can be oriented in other ways (e.g., rotated 90 degrees, inverted, flipped), and the spatially relative descriptors used herein can be interpreted accordingly.

[0044] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0045] In the accompanying drawings corresponding to the embodiments of the present disclosure, the thickness and area of ​​the layers are exaggerated for better understanding and ease of description. In addition, when describing that a component is "substantially" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a partial edge of the entire surface.

[0046] In the description of the embodiments of the present disclosure, when a certain component "includes" another component, unless otherwise specified, other components are not excluded, and other components may be further included. A second component is formed or provided above or on a first component, or a second component is formed or provided on a surface of a first component, or a second component is formed or provided on one side of a first component, and embodiments in which the first component and the second component are in direct contact may be included, and embodiments in which a component between the first component and the second component may not be in direct contact may also be included. For the sake of simplicity and clarity, various components may be arbitrarily drawn in different proportions. In the accompanying drawings, some layers / components may be omitted for simplicity. Unless otherwise specified, a second component is formed or provided on the surface of a first component, which means that the first component is in direct contact with the second component. Among them, the above-mentioned "component" may refer to a layer, a film, an area, a part, a structure, etc.

[0047] The present disclosure provides a housing, referring to Figure 1 , Figure 4 and Fig. 9 As shown, it includes: a top 1 and a bottom 2 arranged opposite to each other, and an annular side portion 3 arranged between the top 1 and the bottom 2. The top 1, the annular side portion 3 and the bottom 2 are sequentially connected to form a containing cavity.

[0048] The annular side portion includes at least one acoustic black hole structure, the outer surface of the acoustic black hole structure is a straight surface, and the inner surface of the acoustic black hole structure is a curved surface; the distance h(x) between the outer surface and the inner surface of the acoustic black hole structure along the first preset direction satisfies the curve equation: h(x)=(h1-h0)(|x| / l) m +h0, h1 is the maximum distance between the outer surface and the inner surface of the acoustic black hole structure along the first preset direction, h0 is the minimum distance between the outer surface and the inner surface of the acoustic black hole structure along the first preset direction, m is a constant and m≥2, |x| represents the absolute value of x.

[0049] The above acoustic black hole structure is based on the acoustic black hole (ABH) effect, thereby achieving vibration reduction and noise reduction. The acoustic black hole structure is designed by designing the structure thickness into a power function h(x) = (h1-h0)(|x| / l) m+h0, the phase velocity and group velocity of the propagating wave in the structure change, thereby achieving wave focusing at the tip of the structure. Ideally, when the thickness is reduced to zero, the phase velocity and group velocity of the bending wave are reduced to zero, resulting in zero wave generation and energy accumulation, thereby achieving vibration reduction and noise reduction. However, in reality, the thickness cannot be zero, but the energy will still accumulate in the area with the minimum thickness of the structure. Therefore, damping materials can be laid in the energy focusing area to absorb sound energy, thereby further reducing structural vibration and achieving further noise reduction effects. Compared with other vibration control methods of related technologies (for example: ordinary reinforcement rib noise reduction technology or vibration reduction pad noise reduction technology, etc.), acoustic black hole noise reduction technology only needs to change the local thickness of the structure to control the propagation of waves. It also has the characteristics of simple structural design, low production cost, and significant vibration reduction and noise reduction effects. It has broad application prospects in engineering practice.

[0050] The distance h(x) between the outer surface and the inner surface of the acoustic black hole structure satisfies the power function equation along the first preset direction: h(x)=(h1-h0)(|x| / l) m +h0, where the first preset direction, l and x need to be determined according to the specific structure of the acoustic black hole structure.

[0051] In some embodiments, reference Figure 1 and Fig.11 As shown, the acoustic black hole structure includes an acoustic black hole plate 31, the first preset direction is the first dimension direction of the acoustic black hole plate 31, l is half the dimension value of the acoustic black hole plate along the first dimension direction, -l≤x≤l, and the first dimension direction is the width direction or length direction of the acoustic black hole plate.

[0052] In the first dimension direction Figure 1 When the width direction of the acoustic black hole plate 31 is shown, the cross section of the acoustic black hole plate can be as follows: Figure 2 As shown, Figure 2 The point O shown is the origin, the horizontal direction is the x-axis and the vertical direction is the y-axis to establish a coordinate system, and the distance h(x) between the outer surface and the inner surface of the acoustic black hole plate satisfies: h(x) = (h1-h0)(|x| / l) m +h0, where h1 is the width direction of the acoustic black hole plate (corresponding to Figure 2 The maximum distance between the outer surface and the inner surface of the acoustic black hole plate (in the x-axis direction shown in the figure), h0 is the width direction of the acoustic black hole plate (corresponding to Figure 2 The x-axis direction shown is the minimum distance between the outer surface and the inner surface of the acoustic black hole plate, and l is half the size of the acoustic black hole plate along its width direction.

[0053] When the first dimension direction is the length direction of the acoustic black hole plate, the longitudinal section of the acoustic black hole plate is Figure 2Similarly, the method of establishing its coordinate system is similar to the method of establishing the first dimension direction corresponding to the width direction of the acoustic black hole plate, and will not be repeated here. The difference is that when the first dimension direction is the length direction of the acoustic black hole plate, the x-axis direction of its coordinate system corresponds to the length direction of the acoustic black hole plate; and when the first dimension direction is the width direction of the acoustic black hole plate, the x-axis direction of its coordinate system corresponds to the width direction of the acoustic black hole plate; the y-axis direction in both cases corresponds to the thickness direction of the acoustic black hole plate.

[0054] In some embodiments, reference Figure 4 As shown, the acoustic black hole structure includes at least one acoustic black hole beam 32, the first preset direction is the length direction of the acoustic black hole beam 32, l is the length value of the acoustic black hole beam 32, 0≤x≤l or -l≤x≤0.

[0055] The longitudinal section of the acoustic black hole beam can be Figure 5 As shown, Figure 5 The point O shown is the origin, the horizontal direction is the x-axis and the vertical direction is the y-axis to establish a coordinate system, and the distance h(x) between the outer surface and the inner surface of the acoustic black hole beam satisfies: h(x) = (h1-h0)(|x| / l) m +h0, where h1 is the length direction of the acoustic black hole beam (corresponding to Figure 5 The maximum distance between the outer surface and the inner surface of the acoustic black beam structure (in the x-axis direction shown), h0 is the length direction of the acoustic black hole beam (corresponding to Figure 5 The x-axis direction shown in the figure is the minimum distance between the outer surface and the inner surface of the acoustic black hole structure, and l is the length of the acoustic black hole beam. It should be noted that if the horizontal right is the positive direction of the x-axis, then 0≤x≤l; if the horizontal left is the positive direction of the x-axis, then -l≤x≤0.

[0056] In some embodiments, the acoustic black hole structure may also include an acoustic black hole plate and at least one acoustic black hole beam. The setting requirements of the acoustic black hole plate and the acoustic black hole beam can refer to the above-mentioned relevant descriptions and will not be repeated here.

[0057] It can be understood that the above h(x)=(h1-h0)(|x| / l) m +h0 determines the origin coordinates as (0, h0), that is, the intersection of the point with the smallest thickness and the x-axis is taken as the origin; if the origin coordinates change, the corresponding h(x) will also change accordingly. For example, take the acoustic black hole beam as an example. If the origin is selected as (0, h1), then Figure 5 The coordinate axis shown is translated to the left by l, and we get Figure 6 , where h(x)=(h1-h0)[(l-|x|) / l] m+h0. Of course, there are other transformation formulas, which are not listed here one by one.

[0058] In the above curve equation, m is a constant. Studies have shown that when the value range of m is [2, 2.5], the noise reduction effect is better. The specific value of m is not limited here. For example, m can be 2, 2.2 or 2.5.

[0059] The application scenario of the above-mentioned housing is not limited. Under the condition of meeting the size requirements, any noise-generating component can be arranged in the housing. For example, the housing can be applied to electronic devices such as water flossers.

[0060] refer to Figure 1 As shown, a first fastener 4 may be provided on the top 1 of the housing, and a second fastener 5 may be provided on the bottom 2 of the housing, which is beneficial for fixing the components to be noise-reduced.

[0061] In the casing provided by the embodiment of the present disclosure, the annular side portion includes at least one acoustic black hole structure; the noise-generating components are arranged in the casing, and based on the acoustic black hole effect, the acoustic black hole structure can significantly eliminate the energy of vibration waves, thereby significantly reducing noise and improving user experience. At the same time, the casing has a simple structure and a low manufacturing cost.

[0062] A specific casing structure is provided below.

[0063] The annular side includes multiple acoustic black hole structures; ref. Figure 1 As shown, the acoustic black hole structure includes an acoustic black hole plate 31, and the annular side portion 3 also includes an annular plate 30, and the acoustic black hole plate 31 is embedded in the annular plate 30; the second dimension direction of the acoustic black hole plate 31 is in the same direction as the height direction of the casing ( Figure 1 The AB direction shown is consistent.

[0064] When the first dimension direction is the width direction of the acoustic black hole plate, the second dimension direction is the length direction of the acoustic black hole plate; or, when the first dimension direction is the length direction of the acoustic black hole plate, the second dimension direction is the width direction of the acoustic black hole plate.

[0065] The shape, size and material of the annular plate are not limited and can be selected according to actual conditions. For example, the annular plate can be a rectangular annular plate, a circular annular plate or an irregularly shaped annular plate.

[0066] The specific number, distribution and materials of the above-mentioned acoustic black hole plates are not limited. For example, if the annular plate includes multiple side plates, at least one acoustic black hole plate can be embedded in one of the side plates; or, an acoustic black hole plate is embedded in each side plate, that is, the annular plate is embedded with four acoustic black hole plates in total; of course, other settings are also possible, which are not given as examples here.

[0067] The materials of the acoustic black hole plate and the annular plate may be the same, or may be different, which is not limited here.

[0068] There is no limitation on the embedding method of the acoustic black hole plate and the annular plate. For example, the long side of the acoustic black hole plate is embedded in the annular plate. At this time, the width direction of the acoustic black hole plate, the height direction of the annular plate and the height direction of the casing are consistent; or, the short side of the acoustic black hole plate is embedded in the annular plate. At this time, the length direction of the acoustic black hole plate, the height direction of the annular plate and the height direction of the casing are consistent.

[0069] The acoustic black hole plate can be made by a mold. In order to facilitate demoulding, when the first dimension direction is the width direction of the acoustic black hole plate, the second dimension direction is the length direction of the acoustic black hole plate; that is, when the long side of the acoustic black hole plate is connected to the annular plate, the thickness of the acoustic black hole plate satisfies the above curve equation along its width direction. Alternatively, when the first dimension direction is the length direction of the acoustic black hole plate, the second dimension direction is the width direction of the acoustic black hole plate; that is, when the short side of the acoustic black hole plate is connected to the annular plate, the thickness of the acoustic black hole plate satisfies the above curve equation along its length direction. In these two structures, the connecting line of the thinnest part of the acoustic black hole plate is consistent with the height direction of the casing.

[0070] To facilitate manufacturing and save costs, in one or more embodiments, the bottom includes a base plate; the acoustic black hole plate, annular plate and base plate of each acoustic black hole structure are integrally formed; for example, the acoustic black hole plate, annular plate and base plate can be manufactured at one time using a mold.

[0071] refer to Figure 3 As shown, the annular plate 30 includes two first side plates 301 and two second side plates 302 , and the first side plates 301 and the second side plates 302 are alternated in sequence and connected end to end; the size L1 of the first side plate 301 is larger than the size L2 of the second side plate 302 , and the acoustic black hole plate 31 is embedded in the first side plate 301 .

[0072] The number of acoustic black hole plates embedded in the first side plate is not limited, but is given as an example. Figure 1 and Figure 3 The drawing is based on the example of embedding an acoustic black hole plate in each first side plate. Fig.11 The drawing is based on the example of two acoustic black hole plates embedded in the first side plate.

[0073] Since the size of the first side panel is larger than that of the second side panel, the noise will be radiated outward mainly through the first side panel. Therefore, it is only necessary to set an acoustic black hole plate in the first side panel to significantly reduce the noise, and there is no need to set an acoustic black hole plate in the second side panel, thereby saving space, reducing the difficulty of mold making, and thus reducing costs.

[0074] A specific casing structure is provided below.

[0075] The annular side includes multiple acoustic black hole structures; ref. Figure 4 and Figure 7 As shown, the annular side portion 3 includes an annular plate 30 , and the acoustic black hole structure 32 is arranged on the inner surface of the annular plate 30 .

[0076] In some embodiments, reference Figure 4 As shown, the acoustic black hole structure includes an acoustic black hole beam 32, and the length direction of the acoustic black hole beam 32 is parallel to the height direction of the housing ( Figure 4 The AB direction shown is consistent.

[0077] In some embodiments, reference Fig. 9 As shown, the acoustic black hole structure includes a Fig. 9 Multiple acoustic black hole beams 32 are connected in sequence (in the AB direction shown in the figure). In the acoustic black hole structure, the ends with the largest thickness or the ends with the smallest thickness of any two adjacent acoustic black hole beams 32 are connected.

[0078] In some embodiments, the acoustic black hole structure can also include the above-mentioned two acoustic black hole beam structures at the same time, that is, the acoustic black hole structure includes an acoustic black hole beam, the length direction of the acoustic black hole beam is consistent with the height direction of the casing; and includes multiple acoustic black hole beams connected in sequence along the height direction of the casing. In the acoustic black hole structure, the ends with the largest thickness or the ends with the smallest thickness of any two adjacent acoustic black hole beams are connected.

[0079] It should be noted that the specific number, distribution method and material of the above-mentioned acoustic black hole beams are not limited. For example, if the annular plate includes multiple side plates, an acoustic black hole beam can be set on the inner surface of one of the side plates, or multiple acoustic black hole beams connected in sequence along the height direction of the casing can be set. Alternatively, an acoustic black hole beam is set on the inner surface of each side plate, or multiple acoustic black hole beams connected in sequence along the height direction of the casing are set. Of course, other settings are also possible, and no examples are given here.

[0080] The casing is equipped with an acoustic black hole beam, which can effectively reduce vibration and noise on the one hand, and on the other hand, improve the strength of the casing without increasing additional costs.

[0081] To facilitate manufacturing and save costs, in one or more embodiments, the bottom includes a bottom plate; the acoustic black hole beam, annular plate and bottom plate of each acoustic black hole structure are integrally formed; for example, the acoustic black hole beam, annular plate and bottom plate can be manufactured at one time using a mold.

[0082] For easy demoulding, refer to Figure 4 and Figure 8As shown, the acoustic black hole structure includes an acoustic black hole beam 32; the thickness W2 of the portion where the acoustic black hole beam 32 is connected to the bottom 2 is greater than the thickness W1 of the portion where the acoustic black hole beam 32 is connected to the top 1.

[0083] In one or more embodiments, reference Figure 4 and Figure 7 As shown, the annular plate 30 includes two first side plates 301 and two second side plates 302, and the first side plates 301 and the second side plates 302 are alternated in sequence and connected end to end; the size L1 of the first side plate 301 is larger than the size L2 of the second side plate 302, and the acoustic black hole beam 32 is arranged on the inner surface of the first side plate 301.

[0084] The number of acoustic black hole beams embedded in the first side panel is not limited, but is for example: Figure 4 The drawing is based on the example of two acoustic black hole beams embedded in the first side panel.

[0085] Since the size of the first side panel is larger than that of the second side panel, the noise will mainly radiate outward through the first side panel. Therefore, it is only necessary to set an acoustic black hole beam in the first side panel to significantly reduce the noise, and there is no need to set an acoustic black hole beam in the second side panel, thereby saving space, reducing the difficulty of mold making, and thus reducing costs.

[0086] From the analysis of the acoustic black hole effect mentioned above, it can be seen that vibration energy will accumulate in the area of ​​minimum thickness in the acoustic black hole structure. Therefore, in order to further improve the noise reduction effect, in one or more embodiments, the casing may also include a damping layer; the damping layer is at least arranged on the inner surface of the part with the smallest thickness in the acoustic black hole structure.

[0087] Example, reference Figure 1 and Figure 3 As shown, if the acoustic black hole structure includes an acoustic black hole plate 31, a damping layer 34 may be provided on the inner surface of the smallest thickness portion of the acoustic black hole plate 31; Figure 4 and Figure 7 As shown, if the acoustic black hole structure includes an acoustic black hole beam 32, and the length direction of the acoustic black hole beam is consistent with the height direction of the housing, a damping layer 34 can be provided on the inner surface of the portion with the smallest thickness of the acoustic black hole beam 32; Fig. 9 and Fig.10 As shown, if the acoustic black hole structure includes a plurality of acoustic black hole beams 32 sequentially connected along the height direction of the casing, a damping layer 34 may be provided on the inner surface of the portion of each acoustic black hole beam 32 where the thickness is the smallest.

[0088] In one or more embodiments, in order to further improve the noise reduction effect, the material of the damping layer includes rubber (for example, butyl rubber, etc.), silicone rubber, fluororubber or other materials with greater damping.

[0089] The disclosed embodiment also provides an electronic device, including: the above-mentioned housing. In application, the noise-generating component can be arranged in the housing, and the acoustic black hole structure arranged in the housing can largely eliminate the vibration wave energy, thereby significantly reducing noise and improving user experience.

[0090] In one or more embodiments, the electronic device is a water flosser; Fig.12 As shown, the water flosser also includes a movement 6, a plurality of first fasteners 4 and a plurality of second fasteners 5; the movement 6 is disposed in a receiving cavity of the casing; the movement 6 is connected to the top 1 of the casing through the first fastener 4, and the movement 6 is connected to the bottom 2 of the casing through the second fastener 5.

[0091] The above-mentioned movement at least includes a motor, a transmission gear, an eccentric gear, a piston connecting rod, a piston, a pump body, a casing, a battery and other structures. The specific details are not given here and can be obtained according to relevant technologies.

[0092] The specific structures of the first fastener and the second fastener are not limited. In order to further reduce noise, in some embodiments, the first fastener includes a screw, and the second fastener includes a vibration isolation pad and a positioning column, and the vibration isolation pad is arranged around the positioning column. The vibration isolation pad reduces the transmission of the movement to the housing, thereby further reducing noise.

[0093] Oral irrigators can be used to remove food residues, soft plaque and some hard stones in the mouth, prevent tooth decay, and maintain periodontal health. They are very effective oral cleaning tools. However, since oral irrigators contain moving parts such as motors, gears, pistons, and high-speed water flow, the noise of oral irrigators is very significant, which seriously affects the user experience and comfort of oral irrigators. Therefore, it is necessary to take effective measures to reduce the noise of oral irrigators.

[0094] The noise of the oral irrigator mainly comes from the vibration noise generated by the casing and the flow noise generated by the high-speed water flow, and the vibration noise is usually the main noise source of the oral irrigator. The vibration of the main casing mainly comes from the movement, and the vibration and noise of the movement mainly come from the rotation of its motor, the meshing of gears, and the reciprocating motion of the piston. Through numerical calculations and experimental studies, it was found that the main casing mode of the oral irrigator was excited and the resonance was generated, which was the cause of the abnormal noise of the oral irrigator. Therefore, the oral irrigator provided in the embodiment of the present disclosure adopts a casing with an acoustic black hole structure for vibration reduction and noise reduction, which can effectively reduce noise and improve the user experience of the oral irrigator.

[0095] In the related art, the noise reduction of the oral irrigator is achieved by optimizing the motor, optimizing the water outlet of the nozzle, or installing a muffler in front of the nozzle. Compared with these technologies, the oral irrigator provided in the embodiment of the present disclosure uses a casing with an acoustic black hole structure for noise reduction, which has a simple design and a more significant noise reduction effect. In addition, compared with the ordinary reinforcement rib noise reduction technology, the noise reduction component of the oral irrigator provided in the embodiment of the present disclosure occupies less space and has a more significant noise reduction effect. Compared with the vibration damping pad noise reduction technology, the noise reduction effect of the oral irrigator provided in the embodiment of the present disclosure is more significant and the reliability is better.

[0096] The present disclosure further provides a design method based on the above-mentioned housing, including:

[0097] S1. Conduct experiments or numerical simulations on electronic devices to obtain noise spectrum. The electronic device may be a device that needs noise reduction, such as a water flosser. The specific methods of the experiments and numerical simulations are not limited here, as long as the noise spectrum can be obtained.

[0098] S2. Determine the starting frequency f of noise reduction based on the noise spectrum c .

[0099] S3. According to Determine the characteristic size l0 of the acoustic black hole structure of the casing; wherein E, ρ, ν are the elastic modulus, density and Poisson's ratio of the material of the casing respectively; and h1 is the maximum distance between the outer surface and the inner surface of the acoustic black hole structure along the first preset direction.

[0100] S4. According to the characteristic dimensions l0 and h1 of the acoustic black hole structure, h0 and l of the acoustic black hole structure are determined to determine the curve equation: h(x) = (h1-h0)(|x| / l) m +h0; wherein, l<l0, h0 is the minimum distance between the outer surface and the inner surface of the acoustic black hole structure along the first preset direction, m is a constant and m≥2; if the acoustic black hole structure includes an acoustic black hole plate, the first preset direction is the first dimension direction of the acoustic black hole plate, l is half the dimension value of the acoustic black hole plate along the first dimension direction, -l≤x≤l, and the first dimension direction is the width direction or the length direction of the acoustic black hole plate; if the acoustic black hole structure includes at least one acoustic black hole beam, the first preset direction is the length direction of the acoustic black hole beam, l is the length value of the acoustic black hole beam, 0≤x≤l or -l≤x≤0.

[0101] Through the above steps S1-S4, the size of the acoustic black hole structure in the casing can be determined, which is beneficial for the subsequent mold making.

[0102] It should be noted that after step S4, the above design method further includes: determining the thickness and length of the damping layer; and determining the distribution mode and number of the acoustic black hole structures, so as to finally determine the structure of the casing. After the design is completed, the noise reduction effect of the casing can also be verified by numerical or experimental methods.

[0103] Those skilled in the art can understand that the above-mentioned embodiments are specific examples for realizing the present disclosure, and in practical applications, various changes can be made to them in form and details without departing from the spirit and scope of the present disclosure. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, so the protection scope of the present disclosure shall be based on the scope defined in the claims.

Claims

1. A housing, characterized in that: include: A top and a bottom are arranged opposite to each other, and an annular side portion is arranged between the top and the bottom, wherein the top, the annular side portion and the bottom are sequentially connected to form a containing cavity; The annular side portion includes at least one acoustic black hole structure, the outer surface of the acoustic black hole structure is a straight surface, and the inner surface of the acoustic black hole structure is a curved surface; the distance h(x) between the outer surface and the inner surface of the acoustic black hole structure along the first preset direction satisfies the curve equation: h(x)=(h1-h0)(|x| / l) m +h0, h1 is the maximum distance between the outer surface and the inner surface of the acoustic black hole structure along the first preset direction, h0 is the minimum distance between the outer surface and the inner surface of the acoustic black hole structure along the first preset direction, m is a constant and m≥2, |x| represents the absolute value of x; The acoustic black hole structure includes an acoustic black hole plate, the first preset direction is a first dimension direction of the acoustic black hole plate, l is a half dimension value of the acoustic black hole plate along the first dimension direction, -l≤x≤l, and the first dimension direction is a width direction or a length direction of the acoustic black hole plate; And / or, the acoustic black hole structure includes at least one acoustic black hole beam, the first preset direction is the length direction of the acoustic black hole beam, l is the length value of the acoustic black hole beam, 0≤x≤l or -l≤x≤0.

2. The housing according to claim 1, characterized in that: The annular side portion includes a plurality of the acoustic black hole structures; The acoustic black hole structure includes the acoustic black hole plate, the annular side portion further includes an annular plate, and the acoustic black hole plate is embedded in the annular plate; The second dimension direction of the acoustic black hole plate is consistent with the height direction of the housing; When the first dimension direction is the width direction of the acoustic black hole plate, the second dimension direction is the length direction of the acoustic black hole plate; or, when the first dimension direction is the length direction of the acoustic black hole plate, the second dimension direction is the width direction of the acoustic black hole plate.

3. The housing according to claim 2, characterized in that: The bottom includes a bottom plate; the acoustic black hole plate, the annular plate and the bottom plate of each acoustic black hole structure are integrally formed.

4. The housing according to claim 2 or 3, characterized in that: The annular plate includes two first side plates and two second side plates, the first side plates and the second side plates are alternated in sequence and connected end to end; the size of the first side plate is larger than that of the second side plate, and the acoustic black hole plate is embedded in the first side plate.

5. The housing according to claim 1, characterized in that: The annular side portion includes a plurality of the acoustic black hole structures; the annular side portion includes an annular plate, and the acoustic black hole structure is arranged on the inner surface of the annular plate; The acoustic black hole structure includes an acoustic black hole beam, and the length direction of the acoustic black hole beam is consistent with the height direction of the casing; And / or, the acoustic black hole structure includes a plurality of the acoustic black hole beams connected in sequence along the height direction of the casing, and in the acoustic black hole structure, the ends with the largest thickness or the ends with the smallest thickness of any two adjacent acoustic black hole beams are connected.

6. The housing according to claim 5, characterized in that: The bottom includes a bottom plate; the acoustic black hole beam, the annular plate and the bottom plate of each acoustic black hole structure are integrally formed.

7. The housing according to claim 5, characterized in that: The acoustic black hole structure includes an acoustic black hole beam; the thickness of the portion where the acoustic black hole beam is connected to the bottom is greater than the thickness of the portion where the acoustic black hole beam is connected to the top.

8. The housing according to any one of claims 5 to 7, characterized in that: The annular plate includes two first side plates and two second side plates, the first side plates and the second side plates are alternated in sequence and connected end to end; the size of the first side plate is larger than that of the second side plate, and the acoustic black hole beam is arranged on the inner surface of the first side plate.

9. The housing according to claim 1, wherein: The housing further comprises a damping layer; the damping layer is at least arranged on the inner surface of the portion with the smallest thickness in the acoustic black hole structure.

10. An electronic device, characterized in that: include: The casing according to any one of claims 1 to 9.

11. The electronic device according to claim 10, characterized in that: The electronic device is a dental flosser; The water flosser also includes a movement, a plurality of first fasteners and a plurality of second fasteners; the movement is disposed in a receiving cavity of the casing; the movement is connected to the top of the casing via the first fasteners, and the movement is connected to the bottom of the casing via the second fasteners.

12. The electronic device according to claim 11, characterized in that: The first fastener includes a screw, and the second fastener includes a vibration isolation pad and a positioning column, and the vibration isolation pad is arranged around the positioning column.

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