CN105937147A - Box for washing machine and washing machine with box - Google Patents

Abstract

The invention discloses a box for a washing machine and the washing machine with the box. The box comprises a first box body and a second box body. The second box body is arranged on the inner side of the first box body. A Helmholtz resonant cavity is formed between the second box body and the first box body. A plurality of Helmholtz through holes communicated with the Helmholtz resonant cavity are formed in the second box body. According to the box, a Helmholtz resonance acoustic absorption structure can be formed by the second box body with the Helmholtz through holes and the Helmholtz resonant cavity, and therefore the acoustic absorption and denoising aims are achieved.

Description

For the casing of washing machine and the washing machine with it

Technical field

The present invention relates to household appliance technical field, especially relate to a kind of casing for washing machine and there is its washing machine.

Background technology

Along with society and the progress of science and technology, user is more and more higher to the requirement of washing machine noise.Meanwhile, noise level is also It it is the important indicator weighing washing machine quality.But, the noise of washing machine is the biggest, there is presently no Ripe solution.

Summary of the invention

It is contemplated that at least solve one of technical problem present in prior art.To this end, one object of the present invention exists In proposing a kind of casing for washing machine, there is the effect of sqouynd absorption lowering noise.

Further object is that a kind of washing machine with above-mentioned casing of proposition.

The casing for washing machine according to a first aspect of the present invention, including: the first casing；With the second casing, described Two casings are located at the inner side of described first casing, limit Helmholtz between described second casing and described first casing Resonant cavity, described second casing is formed the multiple Helmholtz's through holes communicated with described helmholtz resonance chamber.

According to the casing for washing machine of the present invention, be there is by employing the second casing and the Hai Muhuo of Helmholtz's through hole Hereby resonant cavity can form helmholtz resonance sound absorption structure, thus reaches the purpose of sqouynd absorption lowering noise.

According to some embodiments of the present invention, lead to respectively between the corresponding open end of described first casing and described second casing Cross closing plate to close.

Alternatively, described closing plate is rolled over by the corresponding open end of at least one in described first casing and described second casing Bending becomes.

According to some embodiments of the present invention, the top of described first casing and described second casing is suitable to be provided with workbench, The bottom of described first casing and described second casing is suitable to be provided with base, and described workbench closes described Helmholtz altogether Shake the top in chamber and described base closes the bottom in helmholtz resonance chamber.

According to some embodiments of the present invention, each described Helmholtz's through hole is circular hole, and each described Helmholtz is led to The order of magnitude in hole is grade.

According to some embodiments of the present invention, the plurality of Helmholtz's through hole is arranged in array on described second casing.

According to some embodiments of the present invention, described first casing and described second casing are bent into U-shaped respectively.

Specifically, described second casing includes two sidewalls being intervally installed of left and right and is connected to said two sidewall Antetheca between front end, the rear end of the most each described sidewall is provided with the connecting portion that another described sidewall extends.

Washing machine according to a second aspect of the present invention, including the case for washing machine according to the above-mentioned first aspect of the present invention Body.

The additional aspect of the present invention and advantage will part be given in the following description, and part will become from the following description Substantially, or by the practice of the present invention recognize.

Accompanying drawing explanation

Above-mentioned and/or the additional aspect of the present invention and advantage will become bright from combining the accompanying drawings below description to embodiment Aobvious and easy to understand, wherein:

Fig. 1 is the explosive view of the casing for washing machine according to embodiments of the present invention；

Fig. 2 is the first casing shown in Fig. 1 and the schematic diagram of the second casing；

Fig. 3 is the schematic diagram of the second casing shown in Fig. 2.

Reference:

100: casing；

1: workbench；2: close plate；

31: the first casings；32: the second casings；33: helmholtz resonance chamber；

321: Helmholtz's through hole；5: base.

Detailed description of the invention

Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most from start to finish phase Same or similar label represents same or similar element or has the element of same or like function.Below with reference to The embodiment that accompanying drawing describes is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.

In describing the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ", " length ", " width ", " thickness ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end ", " interior ", " outward ", " clockwise ", " counterclockwise ", " axially ", " radially ", the orientation of the instruction such as " circumferential " or position relationship be based on orientation shown in the drawings or position relationship, only It is for the ease of the description present invention and to simplify description rather than instruction or imply that the device of indication or element must have spy Fixed orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.

Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or imply relatively heavy The property wanted or the implicit quantity indicating indicated technical characteristic.Thus, " first ", the spy of " second " are defined Levy and can express or implicitly include one or more this feature.In describing the invention, unless otherwise saying Bright, " multiple " are meant that two or more.

In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " install ", " be connected ", " connection " should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, Or be integrally connected；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, in can being two elements The connection in portion.For the ordinary skill in the art, above-mentioned term can be understood in the present invention with concrete condition Concrete meaning.

Below with reference to Fig. 1-Fig. 3 describe embodiment according to a first aspect of the present invention for washing machine (not shown) Casing 100.Casing 100 for washing machine may be used for washing machine such as rotary drum washing machine.Retouching below the application In stating, illustrate as a example by rotary drum washing machine by casing 100.Certainly, it will be understood to those skilled in the art that Casing 100 can be also used for roller washing machine etc..

As shown in Figure 1-Figure 3, the case for washing machine such as rotary drum washing machine of embodiment according to a first aspect of the present invention Body 100, including the first casing 31 and the second casing 32.

Second casing 32 is located at the inner side of the first casing 31.Here, it should be noted that direction " interior " is appreciated that For the direction towards the first casing 31 center, its rightabout is defined as " outward ", i.e. away from the first casing 31 The direction of the heart.

Second casing 32 and the first casing 31 are spaced apart from each other in inward-outward direction, the second casing 32 and the first casing 31 Between limit helmholtz resonance chamber 33, the second casing 32 is formed and communicates many with helmholtz resonance chamber 33 Individual Helmholtz's through hole 321.Wherein, the sound absorption of the Helmholtz resonator that the first casing 31 and the second casing 32 are constituted Principle of noise reduction is: when sound wave passes near Helmholtz's through hole 321, the air column in Helmholtz's through hole 321 can To regard mass body as, under acoustic pressure as piston back and forth movement, the air in helmholtz resonance chamber 33 is therefore Do expansion compression variation, be similar to the effect of spring, form mass-spring vibration systems；Owing to above-mentioned vibrational system is deposited Make a part of acoustic energy be converted into thermal energy consumption to dissipate in damping；Intrinsic frequency when frequency of sound wave Yu Helmholtz resonator When rate is identical, vibrational system resonates, now air column in Helmholtz's through hole 321 back and forth movement, friction and Make acoustic energy dissipate, thus reduce the purpose of noise.First casing 31 can be common casing 100 structure.

It is understood that for the washing machine of different type of machines, can be according to its main noise frequency range, then with Helmholtz Can be obtained by the structural parameters of the second casing 32 based on through hole 321 plate theory.Specifically, lead to Helmholtz Based on the plate theory of hole 321, it is as follows that the method for designing of Helmholtz's through hole 321 structure is embodied as step:

Step 1, determine the main noise frequency range of washing machine according to the noise spectrum that obtains of test, using its mid frequency as The resonant frequency f of the resonance sound-absorbing structure that the first casing 31 and the second casing 32 are constituted_r；

Step 2, set during resonance sound-absorbing structure resonance intended maximum acoustic absorptivity as α_r, substitute into formula (2) and be calculated The relative acoustic impedance r of micropunch casing 100 structure；

Step 3, according to resonant frequency f_rWith relative acoustic impedance r, then by formula (3) and formula (7) simultaneous obtain resonance sound-absorbing knot Low-frequency limit frequency f of structure₁With high frequency limit frequency f₂, f₁～f₂Between frequency range should comprise the main noise frequency range of washing machine, Otherwise, then by adjusting f_rValue is to update f₁、f₂Value；Substitution formula (6) is calculated the relative sound matter of micropunch casing 100 Amount m；

Step 4, by formula (10), (11) and (13), and substitute into the thickness t of the second casing 32, the first casing 31 and the second case The resonant frequency f of distance D, relative acoustic impedance r and relative acoustic mass m and resonance sound-absorbing structure between body 32_r, solve Obtain Helmholtz's through hole 321 constant Λ, and then be calculated Helmholtz's through hole 321 for the second case during circular hole by formula (12) The diameter d of Helmholtz's through hole 321 of body 32；

Step 5, by formula (9), substitute into relative acoustic mass m, Helmholtz's through hole 321 constant Λ, Helmholtz's through hole 321 Diameter d and the thickness t of the second casing 32, be calculated punching rate σ；Punching rate σ is all Helmholtz's through holes 321 The surface area ratio of area sum and the second casing 32；

Step 6, diameter d according to Helmholtz's through hole 321, the surface area of punching rate σ and the second casing 32 can calculate Obtain the number of Helmholtz's through hole 321.So that it is determined that the structural parameters of the second casing 32.

Wherein, in above-mentioned steps, formula used is as follows:

The acoustic absorptivity of Helmholtz's through hole 321 plate sound absorption structure is given by

$\mathrm{\α}=\frac{4r}{{(1+r)}^2+{\[2\mathrm{\π}fm-\cot (2\mathrm{\π}fD/c_0)\]}^2}---\left(1\right)$

In formula, c₀For the velocity of sound in air, D is the resonant cavity degree of depth, is between the first casing 31 and the second casing 32 Distance, m is relative acoustic mass, and r is relative specific acoustic resistance, and f is sound frequency；

The resonant frequency f of Helmholtz's through hole 321 plate sound absorption structure_rThe acoustic absorptivity at place is represented by

${\mathrm{\α}}_r=\frac{4r}{{(1+r)}^2}---\left(2\right)$

Acoustic absorptivity is α_rLimit cut-off frequency when/2 uses f respectively₁、f₂Represent；By α_r/ 2 substitute into formula (1) convolution (3), Obtain by cotangent therein is carried out approximation

f_r ²=f₁·f₂ (3)

$f_r=\frac{c_0}{2\mathrm{\π}\sqrt{{\mathrm{mDc}}_0+0.356D^2}}---\left(4\right)$

$f_1=\frac{-(1+r)+\sqrt{{(1+r)}^2+4{\mathrm{mc}}_0/D+1.424}}{4\mathrm{\π}m+1.424\mathrm{\π}D/c_0}---\left(5\right)$

$f_2=\frac{(1+r)+\sqrt{{(1+r)}^2+4{\mathrm{mc}}_0/D+1.424}}{4\mathrm{\π}m+1.424\mathrm{\π}D/c_0}---\left(6\right)$

$f_2-f_1=\frac{2{\mathrm{\πDf}}_r^2(1+r)}{c_0}---\left(7\right)$

In formula, relative specific acoustic resistance r can be expressed as with relative acoustic mass m

$r=\frac{3.270\×{10}^{-3}}{d^2}\frac{t}{\mathrm{\σ}}{k}_r---\left(8\right)$

$m=(2.939\×{10}^{-6})\frac{t}{\mathrm{\σ}}{k}_m---\left(9\right)$

In formula, d is micropunch diameter, and t is microperforated panel thickness, and σ is punching rate, k_rAnd k_mIt is respectively acoustic resistance coefficient harmony Quality coefficient, is represented by

$k_r=\sqrt{1+\frac{{\mathrm{\Λ}}^2}{32}}+\frac{\sqrt{2}\mathrm{\Λ}}{8}\frac{d}{t}---\left(10\right)$

$k_m=1+\sqrt{\frac{2}{18+{\mathrm{\Λ}}^2}}+0.85\frac{d}{t}---\left(11\right)$

Wherein, Λ is microperforated panel constant, can pass through formula (12) and calculate

$\mathrm{\Λ}=0.213d\sqrt{f}---\left(12\right)$

$\frac{r}{m}=\frac{50.48f}{{\mathrm{\Λ}}^2}\frac{k_r}{k_m}---\left(13\right)$

The casing 100 for washing machine such as rotary drum washing machine according to embodiments of the present invention, has Hai Muhuo by employing Hereby the second casing 32 and the helmholtz resonance chamber 33 of through hole 321 can form helmholtz resonance sound absorption structure, from And reach the purpose of sqouynd absorption lowering noise.

According to some embodiments of the present invention, pass through respectively between the first casing 31 and the corresponding open end of the second casing 32 Close plate 2 to close.Such as, as it is shown in figure 1, the top and bottom of the first casing 31 and the second casing 32 open respectively Open, be tightly connected by closing plate 2 between upper end and the upper end of the second casing 32 of the first casing 31, now this envelope Closing plate 2 can be formed as the shape that the interval between the upper end of the upper end of the first casing 31 and the second casing 32 is suitable Shape (i.e. U-shaped), similarly, also by closing plate 2 between lower end and the lower end of the second casing 32 of the first casing 31 Being tightly connected, now this closing plate 2 can also be formed as the upper end with the first casing 31 and the upper end of the second casing 32 Between the suitable shape (i.e. U-shaped) in interval.Now closing plate 2 is separate part individually machine-shaping.

Further, plate 2 is closed by the corresponding open end bending of at least one in the first casing 31 and the second casing 32 Formed (not shown).Such as, the upper end of the first casing 31 can have flange (now this flange composition closing plate 2), this flange by the upper end fold inward of the first casing 31 and extends inwardly to be connected to close the last of the twelve Earthly Branches with the second casing 32 The top of Mu Huozi resonant cavity 33.When flange is formed on the second casing 32, the molding mode of this flange is with above-mentioned The flange being formed on the first casing 31 is substantially the same, and does not repeats them here.

According to other embodiments of the present invention, the top of the first casing 31 and the second casing 32 can be adapted to be provided with work Station 1, the bottom of the first casing 31 and the second casing 32 is suitable to be provided with base 5, workbench 1 and base 5 and has distinguished Totally-enclosed first casing 31 and the top of the second casing 32 and bottom, meanwhile, Helmholtz closed by workbench 1 The top of resonant cavity 33 and base 5 close the bottom in helmholtz resonance chamber 33.Now without arrange closing plate 2 or Flange closes helmholtz resonance chamber 33.

According to some embodiments of the present invention, each Helmholtz's through hole 321 is circular hole, and each Helmholtz's through hole The order of magnitude of 321 is grade, and now the size of Helmholtz's through hole 321 is the least.It is understood that Hai Muhuo Hereby the shape of through hole 321 can also be oval, Long Circle or polygon etc..

According to some embodiments of the present invention, multiple Helmholtz's through holes 321 are arranged in array on the second casing 32. Such as, as shown in Figures 2 and 3, multiple Helmholtz's through holes 321 become multiple rows of multiple row uniformly to arrange on the second casing 32 Cloth.It is understood that the arrangement mode that Helmholtz's through hole 321 is on the second casing 32 can be according to reaching Actual noise reduction specifically arrange, preferably to meet actual requirement.

According to some embodiments of the present invention, as shown in Figure 1-Figure 3, the first casing 31 and the second casing 32 are rolled over respectively Curve U-shaped, now the first casing 31 and rear open of the second casing 32, to seal up a door (not shown) after installing, Conveniently the parts in washing machine are installed and keeped in repair.

Specifically, as it is shown on figure 3, the second casing 32 includes two sidewalls being intervally installed of left and right and is connected to two Antetheca between the front end of individual sidewall, the rear end of the most each sidewall is provided with the connecting portion that another sidewall extends. Thus, by arranging connecting portion, facilitate the connection of the second casing 32 and miscellaneous part (sealing up a door after as).

The casing 100 for washing machine such as rotary drum washing machine according to embodiments of the present invention, based on Principles of Acoustics and have Decrease of noise functions, can effectively solve the noise suppressed problem in washing machine such as rotary drum washing machine.

The washing machine of embodiment such as rotary drum washing machine according to a second aspect of the present invention, including according to the above-mentioned first party of the present invention The casing 100 for washing machine of face embodiment.

Other of the such as rotary drum washing machine of washing machine according to embodiments of the present invention constitute and operate skill common for this area It is all known for art personnel, is not detailed herein.

In the description of this specification, reference term " embodiment ", " some embodiments ", " illustrative examples ", It is concrete that the description of " example ", " concrete example " or " some examples " etc. means to combine this embodiment or example describes Feature, structure, material or feature are contained at least one embodiment or the example of the present invention.In this manual, right The schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, Material or feature can combine in any one or more embodiments or example in an appropriate manner.

Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: do not taking off In the case of the principles and objective of the present invention, these embodiments can be carried out multiple change, revise, replace and modification, The scope of the present invention is limited by claim and equivalent thereof.

Claims (9)

1. the casing for washing machine, it is characterised in that including:

First casing；With

Second casing, described second casing is located at the inner side of described first casing, described second casing and described first casing Between limit helmholtz resonance chamber, described second casing is formed and communicates many with described helmholtz resonance chamber Individual Helmholtz's through hole.

Casing for washing machine the most according to claim 1, it is characterised in that described first casing and described Respectively by closing plate closing between the corresponding open end of the second casing.

Casing for washing machine the most according to claim 2, it is characterised in that described closing plate is by described The corresponding open end bending of at least one in one casing and described second casing is formed.

Casing for washing machine the most according to claim 1, it is characterised in that described first casing and described The top of the second casing is suitable to be provided with workbench, and the bottom of described first casing and described second casing is suitable to be provided with base, Top and the bottom in described base closing helmholtz resonance chamber in described helmholtz resonance chamber closed by described workbench.

5. according to the casing for washing machine according to any one of claim 1-4, it is characterised in that each described Helmholtz's through hole is circular hole, and the order of magnitude of each described Helmholtz's through hole is grade.

Casing for washing machine the most according to claim 1, it is characterised in that the plurality of Helmholtz is led to Hole is arranged in array on described second casing.

Casing for washing machine the most according to claim 1, it is characterised in that described first casing and described Second casing is bent into U-shaped respectively.

Casing for washing machine the most according to claim 7, it is characterised in that described second casing includes a left side Antetheca between two sidewalls and the front end being connected to said two sidewall that the right side is intervally installed, the most each described The rear end of sidewall is provided with the connecting portion that another described sidewall extends.

9. a washing machine, it is characterised in that include according to according to any one of claim 1-8 for washing machine Casing.