阅读说明：本技术 一种节能降噪家用电器底座 (Energy-saving noise-reducing household appliance base ) 是由 刘德政 李炎 罗静 王中任 于 2020-04-23 设计创作，主要内容包括：本发明公开了一种节能降噪家用电器底座,属于节能降噪领域,具体包括支撑装置和设于支撑装置内侧的俘能装置,所述俘能装置包括弹性基体和压电片,所述压电片粘贴在所述弹性基体的底部,且所述压电片的横截面积小于所述弹性基体的横截面积,所述弹性基体与所述支撑装置固定连接,所述弹性基体与所述支撑装置围合形成放置家用电器的容置腔。本发明利用底座上的悬臂压电结构通过压电效应将有害振动转变为电能为微电子设备供电,并降低了洗衣机运行时产生的振动噪声,同时到达节能降噪的目的。(The invention discloses an energy-saving and noise-reducing household appliance base, which belongs to the field of energy saving and noise reduction and particularly comprises a supporting device and an energy-harvesting device arranged on the inner side of the supporting device, wherein the energy-harvesting device comprises an elastic matrix and a piezoelectric sheet, the piezoelectric sheet is adhered to the bottom of the elastic matrix, the cross section area of the piezoelectric sheet is smaller than that of the elastic matrix, the elastic matrix is fixedly connected with the supporting device, and the elastic matrix and the supporting device are enclosed to form an accommodating cavity for accommodating a household appliance. The invention utilizes the cantilever piezoelectric structure on the base to convert harmful vibration into electric energy through piezoelectric effect to supply power for microelectronic equipment, reduces vibration noise generated during the operation of the washing machine, and achieves the purposes of energy conservation and noise reduction.)

1. The energy-saving and noise-reducing household appliance base is characterized by comprising a supporting device (2) and an energy capturing device (1) arranged on the inner side of the supporting device (2), wherein the energy capturing device (1) comprises an elastic base body (11) and a piezoelectric sheet (12), the piezoelectric sheet (12) is adhered to the bottom of the elastic base body (11), the cross section area of the piezoelectric sheet (12) is smaller than that of the elastic base body (11), the elastic base body (11) is fixedly connected with the supporting device (2), and the elastic base body (11) and the supporting device (2) are enclosed to form an accommodating cavity for accommodating a household appliance.

2. An energy-saving and noise-reducing base for household appliances according to claim 1, wherein the piezoelectric sheet (12) is made of a two-phase composite material of piezoelectric ceramics and polymers.

3. An energy-saving and noise-reducing base for household appliances according to claim 1, characterized in that the elastic base (11) is made of rolled aluminum material.

4. An energy-saving and noise-reducing household appliance base as claimed in claim 1, wherein the number of energy capturing devices (1) is multiple, and the multiple energy capturing devices (1) are distributed in a rectangular shape.

5. An energy-saving and noise-reducing household appliance base as claimed in any one of claims 1 to 4, wherein the supporting device (2) is provided with mounting holes (212) distributed in an array, the energy harvesting device (1) further comprises L-shaped clamps (13) and bolt and nut assemblies (14) matched with the mounting holes (212), the L-shaped clamps (13) are symmetrically arranged at the upper and lower ends of the elastic matrix (11) and are in close contact with the elastic matrix (11), and the L-shaped clamps (13) are fixedly arranged at the inner side of the supporting device (2) through the bolt and nut assemblies (14).

6. An energy-saving and noise-reducing household appliance base as claimed in any one of claims 1 to 4, wherein said supporting device (2) comprises a plurality of supporting legs (21) and connecting rods (22) disposed between adjacent supporting legs (21), said supporting legs (21) having two perpendicular baffles, said connecting rods (22) being fixedly connected to adjacent baffles.

7. An energy-saving and noise-reducing base for household appliances according to claim 6, characterized in that the length of the connecting rod (22) is adjustable.

8. An energy-saving and noise-reducing household appliance base as claimed in claim 7, wherein each connecting rod (22) comprises 2 sliding rails (221) and a sliding block (222) nested in the 2 sliding rails (221), the sliding rails (221) are arranged below the energy harvesting device (1) and fixed on the supporting legs (21), a plurality of square holes (223) are uniformly distributed on the sliding blocks (222) and the sliding rails (221) along the length direction thereof, and pins (224) are inserted in the square holes (223).

9. An energy-saving and noise-reducing household appliance base as claimed in claim 8, characterized in that a steel ball holder (225) is arranged in the slide rail (221), and a steel ball (226) is arranged in the steel ball holder (225).

10. An energy-saving and noise-reducing household appliance base as claimed in claim 1, characterized in that the edges of the piezoelectric patches (12) are attached with waterproof adhesive tape.

Technical Field

The invention relates to the field of energy conservation and noise reduction, in particular to an energy-saving and noise-reducing household appliance base which is suitable for common household appliances.

Background

With the development of socioeconomic in China, household appliances such as washing machines and the like are more and more widely used in common families. The washing machine can vibrate to generate noise when washing and spin-drying clothes, and if the position of the washing machine is closer to a bedroom where people have a rest, daily rest and study can be influenced, and inconvenience is brought to daily life.

The existing washing machine is generally provided with a vibration and noise reduction system for reducing vibration noise when the washing machine works normally. The Chinese patent No. CN201920893260.4 discloses a noise reduction base for a washing machine, which comprises a support plate, a mounting plate, a noise reduction component, a door plate and a fixed sucker, wherein the mounting plate is mounted at the top of the support plate, the top of the support plate is fixedly connected with a plurality of limiting seats, cushioning springs are mounted in the limiting seats, and the noise reduction component is mounted on the inner walls of the mounting plate and the door plate; the device reduces noise by matching the damping spring with noise reduction components such as an acoustic board, a sound insulation board and the like, and has a complex structure and low utilization rate; moreover, the spring restoring capacity is poor after long-term use, the damping and noise reduction capacity is reduced, and the base is inclined and uneven due to the fact that the elastic restoring capacity of the spring is damaged, and the safety is greatly reduced. In addition, Chinese patent No. CN201710668453.5 discloses a shockproof base of a washing machine, which comprises an L-shaped supporting plate, an L-shaped baffle is welded on the outer wall of the top end of the L-shaped supporting plate, a buffer column is fixed on one end of the outer wall of the top end of the L-shaped supporting plate, which is close to a first telescopic rod, a second telescopic rod is fixed on the outer wall of the bottom end of the corner of the L-shaped supporting plate through a screw, and the outer wall of the bottom end of the second telescopic rod is welded with a supporting leg, one side of the outer wall of the bottom end of the L-shaped supporting plate, which is close to the second telescopic rod, is provided with an installation groove, a push rod motor is fixed on the inner wall of the mounting groove through a screw, a bottom plate is welded at the output end of the push rod motor, a spring is welded on the outer wall of one side of the support rod, which is far away from the L-shaped baffle plate, a buffer plate is welded at one end of the spring, which is far away from the support rod, the device reduces vibrations through spring and bumping post and realizes making an uproar, but the device has spring shock attenuation equally, still has the power of making an uproar weak and the security problem of making an uproar that falls that the spring elastic recovery ability variation brought. Secondly, the above patents all consume the vibration energy of the washing machine during operation through the spring, which causes the waste of the vibration energy.

Disclosure of Invention

In view of the above disadvantages of the prior art, an object of the present invention is to provide an energy-saving and noise-reducing base for a household appliance, which utilizes a cantilever piezoelectric structure on the base to convert harmful vibration into electric energy through piezoelectric effect to supply power to a microelectronic device, and reduces vibration noise generated during operation of a washing machine, and achieves the purpose of energy saving and noise reduction.

The energy-saving and noise-reducing household appliance base comprises a supporting device and an energy harvesting device arranged on the inner side of the supporting device, wherein the energy harvesting device comprises an elastic matrix and a piezoelectric sheet, the piezoelectric sheet is adhered to the bottom of the elastic matrix, the cross sectional area of the piezoelectric sheet is smaller than that of the elastic matrix, the elastic matrix is fixedly connected with the supporting device, and the elastic matrix and the supporting device are enclosed to form an accommodating cavity for accommodating a household appliance.

The household appliances have vibration and noise during operation, such as washing machines, vertical air conditioners, refrigerators and the like. Adopt above-mentioned technical scheme: the elastic matrix and the piezoelectric sheet form a cantilever beam fixed on the supporting device and have piezoelectric effect. The household appliance such as a washing machine is placed on the top of the elastic base body of the base, when the household appliance operates, the washing machine is driven to vibrate by centrifugal force generated by rotation of the drum, the elastic base body is elastically deformed under the action of external force to cause bending of the cantilever beam, and at the moment, the piezoelectric sheet arranged at the bottom of the elastic base body generates voltage under the action of piezoelectric effect and can output electric energy to supply power for the microelectronic equipment; meanwhile, the deformation of the elastic matrix and the partial transformation of the elastic matrix into voltage greatly reduce the mechanical vibration and are beneficial to eliminating noise. Therefore, the invention not only eliminates the vibration noise generated when the washing machine works, but also turns harmful vibration into benefit to be used for power generation, and realizes the purposes of energy saving and noise reduction.

According to the theory of the width division method, when the total width of the cantilever beam is constant, the excitation introduced by the drum when the washing machine works is w ═ w₀sin (2 π nt), the output voltage of the energy harvesting device is expressed by formula (1):

wherein α is the thickness ratio of the elastic substrate to the piezoelectric sheet, β is the ratio of Young's modulus of the elastic substrate to the piezoelectric sheet, N is the number of cantilevers, d₃₁Is the piezoelectric stress constant of the piezoelectric sheet, L is the length of the piezoelectric sheet, K is the integral structure of the composite layer of the elastic matrix and the piezoelectric sheet, and w₀Is the maximum deflection of the elastomeric matrix, A is a complex constant having a value of 1+ α⁴(1-β)²-2α(2α²-3α+2)(1-β)，t_pmIs the width of the elastomeric matrix, t_ssmIs the thickness of the piezoelectric patch, ξ is the damping ratio of the system structure, k is the ratio of the rotational speed of the drum to the system resonant frequency, and n is the rotational speed of the drum.

Furthermore, the piezoelectric patch is made of a two-phase composite material of piezoelectric ceramics and polymers; has good flexibility and can adapt to long-term mechanical vibration and deformation.

Further, the elastic matrix is made of a rolled aluminum material. The rolled aluminum material has large elastic modulus and can bear larger deformation and larger weight, thereby improving the use safety on one hand and leading the piezoelectric effect to be more obvious on the other hand. The selection of a specific elastomeric matrix can be made by the following method:

a. b and w are the width, length and height of the elastomeric matrix, respectively.

The bending-resistant section coefficient W of the elastic matrix section is as follows:

maximum bending moment M borne by elastic base body_maxComprises the following steps:

maximum stress sigma when the elastic base is deformed_maxComprises the following steps:

at the same time, at the baseIn the elastic deformation phase, σ_maxE is the elastic modulus, strain; the deformation deflection of the elastic matrix is w_B，

Wherein I is the moment of inertia of the elastomeric matrix and has a value of I ═ bw³/12；

The larger the deflection of the elastic matrix is, the larger the piezoelectric sheet is deformed, and the larger the generated power is. According to the formula (5), w_BInversely proportional to E, the smaller E the smaller w_BThe larger the elastic modulus, the higher the piezoelectric efficiency, as shown in the formula (4), the material having an elastic modulus of 0.69 × 10 can be selected from rolled aluminum as the elastic matrix, in view of the comprehensive mechanical properties of the material, in accordance with the handbook of metals⁵MPa。

Furthermore, the energy harvesting devices are in a plurality of rectangular distribution, namely the energy harvesting devices are respectively distributed on each rectangular edge of the rectangular structure of the supporting device, so that elastic deformation can be better generated, and the piezoelectric efficiency is improved.

Furthermore, the support device is provided with mounting holes distributed in an array shape, the energy harvesting device further comprises L-shaped clamps and bolt and nut assemblies matched with the mounting holes, the L-shaped clamps are symmetrically arranged at the upper end and the lower end of the elastic matrix and are in close contact with the elastic matrix, and the L-shaped clamps are fixedly arranged on the inner side of the support device through the bolt and nut assemblies. The fixing mode can not damage the integrality of the elastic matrix and can prolong the service life of the elastic matrix.

Furthermore, the supporting device comprises a plurality of support legs and connecting rods arranged between the adjacent support legs, each support leg is provided with two baffle plates perpendicular to each other, and the connecting rods are fixedly connected with the adjacent baffle plates. The baffle can protect the household appliance from being separated from the base due to slight shaking in the operation process, and has the limiting and protecting effects.

Further, the length of the connecting rod is adjustable.

Adopt above-mentioned technical scheme: through the length of adjusting the connecting rod in order to change the distance between the adjacent stabilizer blade, adjust the position of L shape anchor clamps on the baffle simultaneously, realize the regulation of holding chamber size, can satisfy different domestic appliance's specification requirement, application scope is wide, and the practicality is strong.

Furthermore, each connecting rod comprises 2 slide rails and a slide block nested into the 2 slide rails, the slide rails are arranged below the energy capturing device and fixed on the support legs, a plurality of square holes are uniformly distributed in the slide blocks and the slide rails along the length direction of the slide blocks, and pins are inserted in the square holes. After the sliding block slides to a proper position, the pin penetrates through the square holes of the sliding block and the sliding rail to fix the connecting rod, and rigid connection is formed.

Furthermore, a steel ball retainer is arranged in the slide rail, a steel ball is arranged in the steel ball retainer, and the steel ball forms rolling connection between the slide block and the slide rail, so that the friction force is reduced.

Furthermore, waterproof adhesive tapes are attached to the edges of the piezoelectric patches.

The invention has the beneficial effects that:

1. the cantilever piezoelectric structure is formed on the support legs through the elastic base body and the piezoelectric sheets, when the household appliance operates, the elastic base body elastically deforms under the action of external force to cause the cantilever beam to bend, harmful vibration is converted into electric energy through the piezoelectric effect to supply power to the microelectronic equipment, vibration noise generated when the washing machine operates is reduced, and meanwhile, the purposes of saving energy and reducing noise are achieved.

2. Through the length of adjusting the connecting rod and the position of L shape anchor clamps on the baffle, can realize the regulation of holding chamber size to satisfy different domestic appliance's specification requirement, application scope is wide, and the practicality is strong.

3. The base of the invention has compact structure, small occupied space and convenient installation and disassembly.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is an assembly effect diagram of a base of an energy-saving and noise-reducing household appliance and a washing machine in embodiment 1;

FIG. 2 is a structural view of a base of the energy-saving and noise-reducing electric home appliance of embodiment 1;

FIG. 3 is a schematic view of the structure of a supporting foot of embodiment 1;

FIG. 4 is a structural view of a base of the energy-saving and noise-reducing electric home appliance of embodiment 2;

FIG. 5 is a schematic structural diagram of an energy harvesting device according to embodiment 2;

FIG. 6 is a schematic view showing a structure in which a piezoelectric sheet and an elastic base are engaged in accordance with example 2;

FIG. 7 is a schematic structural view of a connecting rod of embodiment 2;

FIG. 8 is a schematic structural view showing the mounting positions of steel balls in the connecting rod according to embodiment 2;

FIG. 9 is a dimensional schematic of an elastomeric matrix;

FIG. 10 is a force diagram of an elastomeric matrix;

in the figure, 1, an energy harvesting device; 11. an elastic base; 12. a piezoelectric sheet; 13. an L-shaped clamp; 14. a bolt and nut assembly; 2. a support device; 21. a support leg; 211. mounting a plate; 212. mounting holes; 22. a connecting rod; 221. a slide rail; 222. a slider; 223. a square hole; 224. a pin; 225. a steel ball retainer; 226. a steel ball; 3. a washing machine.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.