CN101458017B - Connecting pipe for reducing noise and refrigerating plant with the connecting pipe - Google Patents

Abstract

The invention provides a connection tube capable of reducing the noise and a low-noise freezing device with the connection tube capable of reducing the noise. The connection tube capable of reducing the noise in the freezing device of natural service connects a compressor and a condenser and constituted of a double-tube with a vacuum part, thereby being independent of the frequency band of frequency and greatly reducing the noise.

Description

Reduce noise with the connection body and have the refrigerating plant of this connection body

Technical field

The present invention relates to a kind of noise that reduces with connecting body and having the refrigerating plant of this reduction noise with the connection body, in more detail, relate to by making and connect body and constitute by the structure of bimetallic tube with vacuum, irrelevant with the frequency band of frequency and realize that the reduction noise of the effect of excellent reduction noise sound wave reduces the low noise type refrigerating plant of noise with the connection body with being connected body and having.

Background technology

The general refrigerating plant 10 of the simple expression of Fig. 1.

As shown in Figure 1, refrigerating plant 10 has evaporimeter 12, compressor reducer portion 14 and condenser 16, and organically links together mutually.

If drive refrigerating plant by common freeze cycle, then refrigerant is admitted to condenser 16 by compressor reducer portion 14, the connection body 20 that is used for compression refrigerant successively from evaporimeter 12.At this moment, the noise sound wave 22 that produces in described compressor reducer portion 14 on one side is also on one side along connecting body 20 together by propagation towards periphery.

But the connection body 20 of Gou Chenging is made of the mono-layer tube with certain internal diameter as mentioned above, can not bring into play the function that reduces noise sound wave 22 fully, therefore produces the harm of borne noise towards periphery.

As the method that reduces noise, fix a silencer in addition or acoustic resonator in the inside of described connection body 20, reduce noise by causing acoustic resonance.But, under the little and narrow and small situation of the internal diameter that connects body 20, not only be difficult to assemble silencer or acoustic resonator, even assembled silencer or acoustic resonator, the various devices and the parts that are used for fixing silencer or acoustic resonator also are difficult to enter in the connection body 20, therefore in fact, setting and fixing operation need spend the suitable time.

In order to solve above-mentioned such problem, the main connection body 30 that uses as shown in Figure 2.This connection body 30 has a plurality of hole b on elongated tubular a, form wide resonant space in the outside of this elongated tubular a, when elongated tubular a advances, reduces noise by the resistance that forms with to the diffusion of resonant space c at noise sound wave 22 around the b of hole.

But connection body 30 as described above only has the reduction anti noise to long wave, and the compressor reducer portion 14 of common refrigerating plant 10 forms shortwave owing to rotating at a high speed with 9000～17000rpm, therefore, can not expect to have significant reduction anti noise.

Summary of the invention

The present invention makes in order to address the above problem, its purpose is to provide and reduces noise with connecting body and having the low noise type refrigerating plant of reduction noise with the connection body, the body that is connected that connects compressor reducer portion and condenser in refrigerating plant is made of the structure of the bimetallic tube with vacuum, thereby irrelevant and play the effect that reduces the noise sound wave admirably with the frequency band of frequency.

In an embodiment of the invention, provide a kind of reduction noise with connecting body, described reduction noise comprises with the connection body: first body, the refrigerant of refrigerating plant flow therein; Second body, it is round described first body; Vacuum, it is formed between described first body and second body, has the thickness of not propagating to second body along the noise sound wave of described first body transmission.

In addition, with connecting body, have the vacuum valve body for described reduction noise on described second body, the vacuum of vacuum can be adjusted and keep to described vacuum valve body.

In addition, for described reduction noise connection body, the vibration frequency that adds with respect to resonant frequency of preferred described connection body has separation safety coefficient more than 20% (dividing From マ one ヅ Application) at least, thereby prevents because of adding the resonance of the connection body that vibration frequency causes.

In addition, preferred described thickness forms more than 1/4 length of the wavelength that is equivalent to the noise sound wave.

Provide a kind of refrigerating plant in other embodiment of the present invention, the reduction noise of described refrigerating plant is inserted between compressor reducer portion and the condenser with the connection body, and described reduction noise comprises with the connection body: first body, refrigerant flow therein; Second body, it is round described first body; Vacuum, it is formed between described first body and second body, has the thickness of not propagating along the noise sound wave of described first body transmission to second body, the vibration frequency that adds with respect to resonant frequency of described connection body has separation safety coefficient more than 20% at least, prevent that described thickness forms more than 1/4 length of the wavelength that is equivalent to the noise sound wave because of adding the resonance of the connection body that vibration frequency causes.

As described above, because connection body of the present invention is made of the bimetallic tube with vacuum, so it is irrelevant and play the effect that reduces the noise sound wave admirably with the frequency band of frequency, further, can expect to connect body, and can realize the effect of the refrigerating plant of low noise type owing to have such reduction noise usefulness.

In addition, according to the present invention,,, in addition, need not increase cost so saved the time of setting operation correspondingly owing to do not need other silencer or acoustic resonator are installed.

Description of drawings

Fig. 1 is the schematic diagram of the general refrigerator of expression.

Fig. 2 be expression compressor reducer portion shown in Figure 1 with condenser by reducing noise with being connected the body connection, the partial sectional view of the state that refrigerant and noise sound wave advance along the connection body.

Fig. 3 is that expression connects compressor reducer portion and condenser by reduction noise of the present invention with connecting body, and refrigerant and noise sound wave are along the partial sectional view that connects the state that body advances.

Fig. 4 is the A-A cutaway view of connection body shown in Figure 3.

The specific embodiment

Fig. 3 is that expression connects compressor reducer portion and condenser by reduction noise of the present invention with connecting body, and refrigerant and noise sound wave are along the partial sectional view that connects the state that body advances.Fig. 4 is the A-A cutaway view of connection body shown in Figure 3.

As shown in Figure 3, Figure 4, the connection body 40 of the embodiment of the invention has first body 42 and second body 44, and described first body 42 inserts the inside of second body 44 and constitutes two-layer pipe.

In addition, maximize more in order to make the reduction anti noise, formation has the vacuum 46 of predetermined distance t between first body 42 and second body 44.That is, vacuum 46 is formed between first body 42 and second body 44.

As shown in Figure 3, when connecting compressor reducer portion 14 and condenser 16 by described connection body 40, stop up the both sides of vacuum 46 by the shell (casing) that makes the outline that forms compressor reducer portion 14 and condenser 16, and the refrigerant that flows in first body 42 is leaked.

But, be not limited to above-mentioned syndeton, also can be to fix, thereby connect the structure that is connected body of compressor reducer portion 14 and condenser 16 at the other member (not shown) of the both sides of described vacuum 46 welding.

If connect compressor reducer portion 14 and condensers 16 by the connection body that constitutes as mentioned above 40, then the noise sound wave 22 that produces from compressor reducer portion 14 and refrigerant 18 are together while propagating towards periphery by first body 42 that is connected body 40.

At this moment, the vacuum 46 that forms between described first body 42 and second body 44 forms the form around first body 42, and the medium of exist propagating hardly, so the result, the noise sound wave 22 by first body 42 can not propagate into second body 44 by vacuum 46.

As mentioned above, noise sound wave 22 can not be propagated to second body 44 from first body 42 by vacuum 46, and nature can not be heard noise sound wave 22 from the outside of second body 44, therefore can bring into play the function that reduces noise admirably.

In addition, on described second body 44, has the vacuum valve body that is used to adjust and keep the vacuum of described vacuum.

On the other hand, at the interval t of described first body 42, can try to achieve only interval t according to number of blade of phase velocity and frequency of sound wave, compressor reducer portion 14 etc. with respect to second body 44.

[embodiment]

Under the situation of the R-134a refrigerant that uses hydrogen fluorine carbide (hydrofluorocarbon) class usually, the phase velocity of setting first body 42 is 145m/sec, and the rotary speed of compressor reducer portion 14 is 14500rpm, and the number of blade of the outlet of compressor reducer portion 12 is 22.

At this, the frequency of noise sound wave 22 (Hz)=14500/60 * 22=5316Hz, phase velocity is made as " C ".In addition, the wavelength X that is equivalent to described 5316Hz is C/Hz, therefore forms very short wavelength 0.027m (2.7cm).

As mentioned above, use phase velocity and frequency, wavelength, ask t at interval by following general-purpose type.

[formula]

$\frac{1}{\mathrm{\λ}\left(m\right)}145(m/s)=5313\left(\mathrm{Hz}\right)$

λ(m)＝0.027m＝2.79cm

$t\≥\frac{\mathrm{\λ}}{4}\left(m\right)=0.069\mathrm{cm}=6.9\mathrm{mm}$

According to described formula, be about 7mm when above at described interval t, can make and reduce anti noise and maximize more.

And, connect body 40 not because of the vibration frequency (strengthening the frequency of vibration) that adds that adds the power of shaking (strengthening the power of vibration) as refrigerant produces resonance in order to make, the resonant frequency (ω s) of preferred connection adapter 40 is at 0.8 ω s ≦ add in the scope of vibration frequency (Hz)＜1.2 ω s.

That is, the vibration frequency (Hz) that adds with respect to resonant frequency (ω s) has separation safety coefficient more than 20% as mentioned above at least and (divides

マ-ジ Application), thus, do not make connection body 40 produce resonance because of the vibration frequency that adds that refrigerant had, its result can satisfy and reduce anti noise.

Reduction noise of the present invention connects the refrigerating plant of noise with the connection body with connecting body and having, because vacuum 46 forms round first body 42, so noise sound wave 22 can not be propagated to second body 44 from first body 42 at all, and, if make the condition that connects that body 40 does not resonate and satisfy the separation safety coefficient 20% or more, the reduction anti noise is further maximized.

Its result can in addition, can realize low noise type refrigerating plant by the reduction noise characteristic that described connection body 40 is had to the characteristic of the fabulous reduction noise of whole wavelength performances with frequency-independent.

More than, describe the present invention based on embodiment that defines and accompanying drawing, but the present invention is not limited by these embodiment and accompanying drawing, so long as have the people of the common knowledge in the technical field under the present invention, just can with the equal scope of technical conceive of the present invention and claim scope in carry out various modifications and distortion.

Claims (4)

1. one kind is reduced noise with connecting body, comprising:

First body, the refrigerant of refrigerating plant flow therein;

Second body, it is round described first body;

Vacuum, it is formed between described first body and second body, has the thickness of not propagating to second body along the noise sound wave of described first body transmission, it is characterized in that,

The vibration frequency that adds with respect to resonant frequency of described connection body has separation safety coefficient more than 20% at least, prevents because of adding the resonance of the connection body that vibration frequency causes,

Described thickness forms more than 1/4 length of the wavelength that is equivalent to the noise sound wave.

2. the reduction noise that has utilized vacuum as claimed in claim 1 is characterized in that having the vacuum valve body at described second body with connecting body, and the vacuum of described vacuum can be adjusted and keep to described vacuum valve body.

3. a refrigerating plant is characterized in that, reduces noise and is inserted between compressor reducer portion and the condenser with the connection body, and described reduction noise comprises with the connection body: first body, refrigerant flow therein; Second body, it is round described first body; Vacuum, it is formed between described first body and second body, has the thickness of not propagating along the noise sound wave of described first body transmission to second body, the vibration frequency that adds with respect to resonant frequency of described connection body has separation safety coefficient more than 20% at least, prevent that described thickness forms more than 1/4 length of the wavelength that is equivalent to the noise sound wave because of adding the resonance of the connection body that vibration frequency causes.

4. refrigerating plant as claimed in claim 3 is characterized in that, has the vacuum valve body on described second body, and the vacuum of vacuum can be adjusted and keep to described vacuum valve body.

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