CN205478220U - A discharge filter for compressor - Google Patents

Abstract

The utility model provides a discharge filter (10) for compressor, especially hermetic refrigeration compressor. This discharge filter includes: casing (20), can with lid (30) of casing (20) joint in order to form confined inner space (S), the process casing (20) extend to inlet tube (40) in the inner space (S), the process lid (30) extends to outlet pipe (50) in the inner space (S), and set to with gasket (60) of two cavities that inner space (S) share separates. The discharge filter is still including passing gasket (60) set up and are used for the intercommunication intervalve (70) of two cavities. According to the utility model discloses a very big noise attenuation can be realized to the discharge filter.

Description

Discharge filter for compressor

Technical field

This utility model relates to a kind of for compressor, especially for totally-enclosed reciprocal refrigeration The discharge filter of compressor.

Background technology

Closing refrigeration compressor is the vitals in the such as refrigeration system such as refrigerator, refrigerator, For suction refrigeration fluid the high-pressure spray that is compressed producing this fluid to it.In pressure In contracting machine work process, fluid often produces sound wave.Sound wave can be in refrigeration system It is connected to inspiratory circuit and the exhaust lay out of compressor, thus these sound waves (also referred to as " arteries and veins Dynamic ") noise problem can be produced.Therefore, main during compressor is also these refrigeration systems Noise source.

In order to tackle this noise problem, enclosed refrigeration compressor is often in the envelope of electromotor Suction filter and discharge filter it is equipped with, it is desirable to leave pressure at sound wave or fluctuation in closed shell body Certain fluctuation energy is consumed by phenomenons such as reflection, interference, to reach to disappear before contracting casing body The effect of sound.

Along with improving constantly the pursuit of quality of life, people are to noiseless refrigerator, refrigerator etc. Cry is more and more higher.In this case, well known in the prior art for closed compression Although the discharge filter of machine can reduce noise problem to a certain extent, but effect is not Highly desirable, still can not meet the needs of people.

This utility model is directed to a kind of discharge filter for compressor, and it can pole The greatly noise of fall-off compression machine, makes compressor more become " noiseless " and " quiet ".

Summary of the invention

This utility model provides a kind of for needing the exhaust gas filter of the compressor of acoustic attenuation Device.This discharge filter includes: housing；Can engage with housing to form the inside closed The lid in space；Inlet tube in housing extends to inner space, for receiving from pressure The fluid of contracting machine；The outlet in inner space is extended to, for being discharged by fluid through lid Described discharge filter；And it is arranged to be divided into inner space the pad of two chambers separated Sheet.Described discharge filter also include through pad arrange for connection two chambers in Between manage.By arranging intervalve, according to discharge filter of the present utility model relative to existing The impulse attenuation efficiency of the discharge filter of technology is greatly improved.

According to a kind of embodiment, housing, lid and pad are combined in one by a joint portion Rise, so that pad is easily held in place.

According to a kind of embodiment, the length of intervalve exists with the ratio of the length of discharge filter Between 0.35 and 0.45.

According to a kind of embodiment, the length of discharge filter with it in addition to the region of joint portion The ratio of the external diameter at place is between 3 and 4.

According to a kind of embodiment, the pad largest chamber formed and the volume of minimum cavity Ratio is between 1.4 to 1.8.

According to a kind of embodiment, the external diameter of described inlet tube, the external diameter of described outlet or The ratio of the external diameter at place in addition to the region of joint portion of the external diameter of described intervalve and discharge filter Between 0.15 and 0.25.

According to a kind of embodiment, inlet tube length in inner space and discharge filter The ratio of length between 0.2 and 0.3.

According to a kind of embodiment, outlet length in inner space and discharge filter The ratio of length between 0.05 and 0.15.

According to a kind of embodiment, the eccentricity between inlet tube and intervalve can be 0 to row Between the 90% of the internal diameter of air filter.

Preferably, compressor could be for the totally-enclosed reciprocating compressor of refrigeration system.

By having said structure and geometric properties, according to discharge filter of the present utility model Bigger impulse attenuation can be realized for larger range of compressor noise frequency, thus realize The most quiet a kind of compressor.

Accompanying drawing explanation

Fig. 1 is the perspective view of the discharge filter according to prior art；

Fig. 2 is the sectional view of the discharge filter of Fig. 1；

Fig. 3 is the perspective view according to discharge filter of the present utility model；

Fig. 4 is the sectional view of the discharge filter of Fig. 3；

Fig. 5 is the schematic diagram of a kind of acoustic model；

Fig. 6 is that the transmission loss of the acoustic model shown in Fig. 5 is bent with frequency and section relation of plane Line；With

Fig. 7 is to show the discharge filter of prior art and according to aerofluxus of the present utility model The schematic diagram of the comparison of the reduction noise curve of filter.

Detailed description of the invention

Referring to the drawings illustrative embodiments of the present utility model is described in detail. In the accompanying drawings, identical reference represents identical element.It is appreciated that to illustrate Purpose, accompanying drawing is not necessarily drawn to scale.

Fig. 1 illustrates the discharge filter 1 of a kind of prior art.As known in the art, aerofluxus Filter 1 is generally arranged at the exhaust lay out as compressor in the closed housing body of compressor Exhaustor in.Fig. 2 is the sectional view of discharge filter 1.As it can be seen, exhaust gas filter Device 1 includes housing 2 and the lid 3 covered on the opening of housing 2.Inlet tube 4 is through lid 3 Extend inward in housing 2, for receiving the fluid media (medium) of such as cryogenic fluid, outlet 5 Blind end through housing 2 stretches out, for exhaust fluid medium.Pad 6 is arranged in In housing 2, the inside of housing 2 is divided into two chambers in left and right.Hole is formed in pad 6 To connect two chambers.For this discharge filter, the internal volume of two chambers is usual It is total up to about 20 cubic centimetres, and the volume ratio of largest chamber and minimum cavity is of about 9.

As described in the application background technology, although this known discharge filter can be real The most certain aerofluxus ripple attenuation, but in order to develop more noiseless refrigeration system compressor, Need this discharge filter is improved so that it is attenuating pulsation in hgher efficiency.

This utility model proposes to improve for the discharge filter of prior art.Specifically, Fig. 3 Show the perspective view according to a kind of discharge filter 10 of the present utility model.This aerofluxus Filter 10 can by support the temperature of fluid media (medium) (such as cold-producing medium) that uses in compressor and Any kind of material manufacture of pressure.According to shown embodiment, discharge filter 10 The lid 30 of closed interior space S is formed on the housing 20 including housing 20 and lid.Can see Arriving, shown housing 20 and the shape of lid 30 are essentially identical, are tapered at one end substantially Hollow cylindrical, thus both combine the shape forming similar capsule.But, housing 20 and lid 30 also can have other shapes.Inlet tube 40 extends inward into through the blind end of housing 20 In housing 20, it is used for receiving cold-producing medium.Outlet 50 for discharging refrigerant passes through lid The blind end of 30 extends to cover outside 30.Pad 60 is arranged on housing 20 and the combination of lid 30 At portion, internal space S is divided into two chambers.Intervalve 70 extends through pad 6, uses Two chambers in about connection.

As shown in Figure 4, housing 20, lid 30 and pad 60 between there is single joint portion U, Thus pad 60 can easily maintain its position.According to a kind of embodiment, housing 20 Opening is formed with the periphery that diameter increases, thus forms shoulder with other parts of housing. Pad 60 can be inserted into the opening of housing 20 in place against this shoulder.The opening of lid 30 Pad 60 can be kept on other direction in place and with the periphery sealing engagement of housing 20.When So, it is contemplated that periphery can also be formed at the opening of lid 30.Can also other modes At housing 20, between lid 30 and pad 60, form joint portion U, easily keep pad 60 Position.

Parts according to discharge filter 10 of the present utility model can be retouched by following geometric properties State.Specifically, the length representing discharge filter 10 with L, represent discharge filter with D The external diameter of 10 (in addition at the joint portions of housing 20, lid 30 and pad 60), uses L1 Represent the inlet tube 40 length in internal space S, represent the length of intervalve 70 with L2, The outlet 50 length in internal space S is represented with L3.So, new according to this practicality The discharge filter 10 of type, the value of L/D is between 3 and 4, and the value of L1/L can be 0.2 He Between 0.3, the value of L2/L can be between 0.35 and 0.45, and the value of L3/L can be 0.05 to arrive 0.15.It addition, the largest chamber that formed in discharge filter 10 of pad 60 and minimum cavity Volume ratio be of about 1.4 to 1.8.Further, inlet tube 40, outlet 50 or intervalve The ratio of the external diameter of 70 and the outer diameter D of discharge filter 10 can be between 0.15 and 0.25.Enter The eccentricity of mouth pipe 40 and intervalve 70 can be between the 90% of 0 to filter inside diameter.

By using above-mentioned geometric properties, decay according to discharge filter of the present utility model The ability of pulse is greatly reinforced.Discharge filter is depended on by the design model below based on Fig. 5 According to principle explain.Two chambers that the design model of Fig. 5 includes being connected by pipe Assembly, the area of section of two of which chamber is S1, a length of LL of connecting tube, pipe Area of section is S2.Assume that sound wave is propagated in the x direction.

Known for sound-attenuating system, generally utilize transmission loss TL to describe its acoustical behavior, This transmission loss is defined as:

$TL=L_{wi}-L_{wo}=10{\log }_{10}\left|\frac{S_i{p_i}^2}{S_o{p_o}^2}\right|$

Wherein, L_wiIt is the incident acoustic power level of sound-attenuating system entrance, L_woIt it is sound-attenuating system outlet The acoustic power level of middle transmission, S_iAnd S_oIt is the face, cross section of the entrance and exit of sound-attenuating system respectively Long-pending, p_iIt is the acoustic stress of incidence wave in entrance, p_oIt it is the acoustics pressure transmitting ripple in outlet Power.Loss TL is the biggest in transmission, shows that the effect of sound-attenuating system is the best.

The transmission loss of the design model shown in Fig. 5 and the relation curve in frequency and cross section are by Fig. 6 Illustrate.Wherein, fn is the natural frequency of design model, i.e. includes the pipe resonance of a length of LL Frequency.The calculating as follows of this frequency:

f_n=n.c/ (2LL)

Wherein, c is the velocity of sound of fluid, n be integer (1,2,3 ...).

From the curve of Fig. 6 it can be seen that, exhaust chamber decay with between S1 and S2 difference increasing Increase greatly.Additionally, when f/fn is 0.5,1.5,2.5 etc., the value of TL is maximum, and with F/fn close to 1,2,3 etc., the value of TL reduces, it means that the decay of design model is also Reduce.

Utilize principle above that the discharge filter 1 of prior art is analyzed.Due to row Air filter 1 connects two chambers only with hole, it is assumed that this hole has the length of 3mm also Use R600a as cold-producing medium, i.e. fluid sound speed c is 220m/s, then filter resonance will Occur with the interval of about 36kHz.This means that the maximum of transmission loss curve occurs in 18kHz, and this is away from the discharge filter purport for enclosed refrigeration compressor of the present utility model Far in the region realizing maximum attenuation.It is to say, this discharge filter can not be fine Realize target fluctuation decay.

Intervalve 70 is utilized to connect two chambeies according to discharge filter 10 of the present utility model Room, it is assumed that this intervalve 70 has the length of such as 15mm, for same R600 system Cryogen, transmission loss TL will be maximum at 3.5kHz and 11kHz, it means that it is at 400Hz Than discharge filter 1, there is bigger decay, thus realize bigger sound deadening capacity.

Fig. 7 shows according to discharge filter of the present utility model with according to the row of prior art The attenuation verses that air filter is realized.It will be seen that according to aerofluxus of the present utility model Filter realizes bigger declining in the scope of more than 400Hz compared with the discharge filter of prior art Subtracting, the decay realizing up to 20dB at the 3rd frequency band near 1000Hz increases.

More than only give the example of R600 cold-producing medium, but for such as R134a, R290 Deng any other fluid, only the velocity of sound is different, is suitable for identical calculating.It is visible, More quiet compressor can be realized according to discharge filter of the present utility model.

It addition, this utility model by between inlet tube 40 and intervalve 70 and in Between between pipe 70 and outlet 50, eccentricity is set, it is to avoid relevant with nonlinear acoustics Phenomenon: such as large mass, the pipe of alignment may imply that less decay, because Sound wave can be through pipe in the case of decaying not over cavity volume.Arranging eccentricity then can phase Avoid this phenomenon with answering.

Although this utility model is described by exemplary embodiment, but this reality It is not limited to details described herein with novel.Therefore, those skilled in the art passes through Corresponding amendment and modification that this utility model can be carried out by teaching herein all fall in this practicality In novel scope.

Claims (11)

1. the discharge filter (10) being used for needing the compressor of acoustic attenuation, including:

Housing (20)；

Lid (30), it can engage to form the inside closed empty with described housing (20) Between (S)；

Inlet tube (40), it extends to described inner space (S) through described housing (20) In, for receiving the fluid from compressor；

Outlet (50), it extends to described inner space (S) through described lid (30) In, for fluid is discharged discharge filter；And

Pad (60), it is arranged to described inner space (S) is divided into two chambeies separated Room,

It is characterized in that, described pad (60) is provided with connection said two chamber Intervalve (70).

Discharge filter the most according to claim 1 (10), it is characterised in that institute State housing (20), described lid (30) and described pad (60) by a joint portion (U) Combine.

Discharge filter the most according to claim 1 (10), it is characterised in that institute State the length of intervalve (70) ratio with the length of discharge filter (10) 0.35 and 0.45 Between.

4., according to the discharge filter (10) according to any one of claim 1-3, it is special Levying and be, the length of discharge filter (10) is located in addition to the region of joint portion (U) with it The ratio of external diameter is between 3 and 4.

5., according to the discharge filter (10) according to any one of claim 1-3, it is special Levy and be, pad (60) largest chamber formed and the volume ratio of minimum cavity are 1.4 Between 1.8.

6., according to the discharge filter (10) according to any one of claim 1-3, it is special Levy and be, the external diameter of described inlet tube (40), the external diameter of described outlet (50) or institute State the external diameter of intervalve (70) and discharge filter (10) except the region of joint portion (U) The ratio of the external diameter at outer place is between 0.15 and 0.25.

7., according to the discharge filter (10) according to any one of claim 1-3, it is special Levy and be, the inlet tube (40) length in described inner space (S) and discharge filter (10) ratio of length is between 0.2 and 0.3.

8., according to the discharge filter (10) according to any one of claim 1-3, it is special Levy and be, the outlet (50) length in described inner space (S) and discharge filter (10) ratio of length is between 0.05 and 0.15.

9., according to the discharge filter (10) according to any one of claim 1-3, it is special Levying and be, the eccentricity between inlet tube (40) and intervalve (70) can be in 0 to aerofluxus Between the 90% of the internal diameter of filter (10).

Discharge filter the most according to claim 2 (10), it is characterised in that institute State joint portion and include being formed at the periphery that the diameter of the opening of housing (20) increases, thus Forming shoulder in housing (20), described lid (30) and described pad (60) are against institute State shoulder and described periphery sealing engagement.

11. according to the discharge filter (10) according to any one of claim 1-3, and it is special Levying and be, described compressor is the totally-enclosed reciprocating compressor for refrigeration system.