CN2285381Y

CN2285381Y - Top cover improved refrigeration compressor

Info

Publication number: CN2285381Y
Application number: CN96206554U
Authority: CN
Inventors: 费布尤·朱斯托
Original assignee: Zanussi Elettromeccanica SpA
Current assignee: ACC Compressors SpA
Priority date: 1995-03-21
Filing date: 1996-03-19
Publication date: 1998-07-01
Anticipated expiration: 2006-03-19
Also published as: FR2732099A1; FR2732099B1; ITPN950016U1; ITPN950016V0; BR9601053A; IT238842Y1; DE29602915U1

Abstract

The utility model relates to a top cover improved refrigeration compressor which is mainly used for the motor compressor of household refrigerators. The top cover improved refrigeration compressor has a casing which is composed of a spherical base (1) and a top cover (2); a vibration reducing belt (3) made of vibration absorbing material is arranged on the top cover. The vibration absorbing material is multilayer material, and is composed of at least one metal outer layer, one viscoelastic middle layer and one sticky inner layer, wherein, the metal outer layer is better aluminous.

Description

Improve the refrigeration compressor of top cover

The utility model relates to a kind of denoising device that is used for the hermetic compressor shell, and this compressor is mainly used in household refrigerating device.

As everybody knows, the main noise of household refrigerator is that hermetic compressor produces when compression refrigeration gas and launches.

In order to reduce the noise of this vitals, people have adopted many measures and improvement, about this problem a large amount of patents are arranged also.

But, can see that great majority improve and are conceived to reduce generating noise, particularly when noise produces it are decayed.

But in order not lose the possibility of any minimizing noise, particularly in order to decay by the dither that has seal container to propagate, many researchs efforts be made so that shell can seal noise.

Pass shell in order to reduce noise, an effective way is the wall thickness that increases it.Certainly, this implements and is easy to, but because wall thickness is very thick, the complicated and additional manufacture cost of manufacturing technology also will be following.

According to the technology of knowing, the another kind of method of noise insulation be with sound-absorbing material with container whole or local wrapping.Certainly, this method can reduce, or even significantly reduces the noise of emission, but it is not suitable for compressor.Because sound absorbing material also is a thermal-protective material simultaneously, and the surface temperature of compressor is very high, and the heat exchange of only outer surface and air is cooled off.

People wish, also are the purpose of this utility model simultaneously, realize a kind of like this compressor, its shell can be with traditional technology and made, but existing by some additional materials and use, economy, reliable technique make shell have the ability of lower outside conducted noise.

The shell that reaches the household refrigerator compressor of this purpose has a spherical base and a top cover, it is characterized by: a vibration damping band is arranged, the vibration of the top cover that is used to decay on the outer surface of top cover.This vibration damping band is by one deck metal outer at least, the adhesive layer that mesosphere that one deck viscoelastic material constitutes and adhesive material constitute.Outer metal layer, middle viscoelastic layer and interior adhesive layer are mutually also together.Outer metal layer is a flake aluminum.

This vibration damping band can bear up to 150 degree high temperature Celsius and not produce permanent sex change.Interior adhesive layer still can be bonded on the outer surface of loam cake under the 120 degree conditions of high temperature Celsius continuously securely.

To show characteristics of the present utility model and superiority by the description to following non-limitative example, relevant accompanying drawing is:

Fig. 1 is a compressor external view of the present utility model.

Fig. 2 is the sectional views of parts of the present utility model perpendicular to thickness.

Fig. 3 is the comparative graph of noise with compressor emission of parts of the present utility model and the utility model parts useless.

Main thought of the present invention is: our consideration is based on two relevant situations.First situation is: constitute the noise of the compressor emission of shell by spherical base 1 and top cover 2, most of middle frequency vibration from shell, just 2000 to 4000Hz.We are also noted that the vibration of base 1 in this frequency range is little, and this is because base 1 is connected with the base plate of refrigerator by connection set.The vibration of base 1 is subjected to the restriction of base plate like this, has been reduced, and can not cause bigger noise.

Another situation is, most noise is that this top cover 2 is not blocked by any device that can absorb vibration by top cover 2 emissions of shell.

We just can be by reducing top cover vibration the reduction effectively noise like this.

Main innovation of the present utility model that Here it is.

Thereby our work is the top cover vibration that reduces as the shot noise final cause, rather than the noise of the emission of being devoted to decay.

In order to reduce the vibration of top cover, we have tested many different attenuating devices and different setting method, have obtained one at the globally optimal solution that keeps under the heat dissipation characteristics situation.Here it is adds a strip 3, and its material also has elasticity and viscosity simultaneously except having thermal conductivity.This will be explained further below.

This band 3 is preferably disposed on the outside on top cover top, and it also can be divided into several, and their layout depends on the geometrical shape of top cover.They have better attenuating.

This strap must possess following characteristic:

--ductility, so that be attached to the top cover surface that is generally curved surface well,

--damping and amortization, vibration will be absorbed effectively like this, rather than is propagated once more,

--connecting surperficial toughness, so that belt can keep being bonded on the top cover after on being contained in top cover,

--structural, tightness and the ability of bearing high temperature and external damage factor.

Owing in fact do not have a material that has desirable characteristics effectively, must a kind of sandwich tape of design, wherein each layer has the function that one or more are determined.

Empirical tests, this bringing to should have three layers less: a mesosphere 5 that is made of damping material; An internal layer 4 that is made of cohesive material is so that be fixed on the mesosphere on the surface of top cover; A skin 6, it can reflex to sound wave the surface of initial transmissions again.

In fact, we know, reduce by a vibration surface, and as compressor surface, the effective ways of noise are to set up a sound damper on this surface.Promptly constitute a chamber, the vibration of the first surface emission in chamber will be reflected by second surface, can also between these two surfaces a mesosphere be set, and emission and reflected sound wave interact and decay mutually in the mesosphere.

Under our situation, first surface is the surface of top cover 2, and second surface or reflecting surface are tinsel 6, and it has certain average distance apart from the surface of top cover 2, and certain rules is arranged.Be mesosphere 5 between the two, it is (directly) noise elimination effectively.

Like this, we have set up a real sound damper at least on the part of top cover.Reduced its noise effectively.

This sheet 6 will be able to be protected the viscoelastic layer below it, makes it keep tight and continuous, resembles the protection structure of an outside.In addition, in order to bear high temperature, prevent that possible corrosion or destructive factor and assurance from having enough plasticity to adapt to the shape of top cover, this sheet is aluminium flake preferably.

The final products that satisfy above-mentioned performance can find on market, for example the trade mark produced of the WARDLE STOREYS of Britain company be that the product of " DEDP AN " just can be used here effectively: in fact, this product is exactly the multilayer band shape, the outside of the viscoelastic layer 5 of intermediate absorption vibration is a flake aluminum, inside has been coated with one deck can bear cohesive material 4 up to 150 degree high temperature Celsius, will run into such high temperature in the production process that the vibration damping band is installed.

This band can be installed before or after the shell mopping.No matter in which kind of situation, the viscosity of viscous layer and heat-resisting quantity must with relevant match materials.But this requirement is easy to reach for the one skilled in the art.As long as this considers that used compressor can reach 100 in the temperature of running hours top cover.

In order to verify the validity of the vibration damping band of introducing above, to having this vibration damping band and not having the noise of the compressor of this vibration damping band to study.The result is as shown in table 1.The first behavior measure frequency in the table, second row (A) are the measured value when having the vibration damping band, and the third line (B) is the measured value that removes the compressor of vibration damping band.Used noise figure provides by dBA.

In the scope of about 4000Hz, just in the centre area of noise frequency, can see the improvement that the vibration damping band brings significantly at about 2000Hz.

This improvement is found out by the curve in Fig. 3 is easier.

At last, an outermost surface 7 is arranged among Fig. 2, it is coating or enamelled coating, also is to mark for belt, and it is without any the effect of reality, just for meticulousr expression.

Table 1

Hz→ A→ B→

250 9.5 12.7

315 14.2 15.2

400 24.2 24.6

500 21.5 21.0

630 15.3 14.0

800 16.4 15.7

1000 21.0 24.3

1250 19.5 18.2

1600 33.8 34.5

2000 36.4 36.1

2500 28.6 36.1

3150 26.5 34.1

4000 28.7 34.2

5000 29.0 29.1

6300 26.1 26.6

?8000 ?25.3 ?25.6

?10000 ?28.1 ?26.4

?LWA ?40.7 ?42.8

Claims

1. be mainly used in the motor compressor of household refrigerator, it has a shell, and shell is made of spherical base (1) and top cover (2), it is characterized by: be provided with the vibration damping band (3) that a multilayer material constitutes in the outside of this top cover, so that absorb the vibration of top cover.

2. compressor as claimed in claim 1 is characterized by the vibration damping that is made of multilayer material and brings to and have a metal outer (6) less, the internal layer (4) of the mesosphere of a viscoelastic material (5) and a cohesive material.

3. compressor as claimed in claim 2 is characterized by: this metal outer (6), viscoelasticity mesosphere (5) and interior viscous layer (4) are and together.

4. as claim 2 or 3 described compressors, it is characterized by: metal outer (6) is a flake aluminum.