CN1079913C - Rotary compressor - Google Patents

Abstract

The present invention provides a rotary compressor in order to reduce the gas resonance in a closed container owing to the pressure pulsation of the exhausted gas and the vibration generated from the pressure pulsation in the rotary compression element cylinder so as to reduce the noise in operation. The lower part of a closed container 1 of which the inner bottom is filled with refrigerated machine oil O is provided with an electric element 2 and a rotary compression element 4 driven by the electric element 2; a cylinder 5 of the rotary compression element 4 is arranged between a supplementary bearing 7 and a main bearing 6 which supports the shaft 3 of the electric element 2 in a pivot mode, and is fixed to the inner peripheral side wall 1a of the closed container 1; a space 10 is formed between the upper end surface 5a of the cylinder 5 and the lower surface 2a of the electric element 2, and part of the interface of the space 10 is made of a sound absorbing material (the oil surface L of the refrigerated machine oil O).

Description

Rotary compressor

The present invention relates to a kind ofly be installed in for example rotary compressor of air conditioner or refrigerating machine etc., thus particularly a kind of by formed space interfacial structure between electric element in the seal container and the revolution compressing member having been improved, reduced significantly the rotary compressor that vibration that the gas column sympathetic response of discharging in the seal container that the gas pressure pulsation produced and the pressure pulsation in the revolution compressing member cylinder causes has reduced noise in operating.

In the past, the structure example of this rotary compressor as shown in Figure 6, bottom in inner bottom part accumulates the seal container 1 that refrigerator oil O is arranged, the revolution compressing members 4 that electric element 2 are housed and drive by the axle 3 of this electric element 2, the cylinder 5 of this compressing member 4 is contained between the main bearing 6 and supplementary bearing 7 of the axle 3 that pivotally supports aforementioned electric element 2 by covering 8, this cylinder 5 engages with interior all side wall surface 1a of aforementioned seal container 1 and is fixing, simultaneously, between the lower surface 2a of the upper-end surface of cylinder 5 5a and electric element 2, form space 10, and the shape of aforementioned cylinder 5 adopts inkfish type structure as shown in Figure 7.

But, in the rotary compressor of above-mentioned structure in the past, owing to adopt at revolution compressing member 4 under the situation of inkfish shape cylinder 5, few with the junction of seal container 1, therefore, be difficult to reduce the high frequency vibration of seal container 1.

In addition, even image pattern 8 and shown in Figure 9, adopt the situation of circular cylinder in the past 5, because whole interfaces of aforesaid space 10 are formed by rigid walls substantially, acoustic wave energy almost 100% becomes reflectivity, be difficult to reduce by discharge in the seal container 1 that the gas pressure pulsation causes gas column altogether toot and cylinder 5 in the vibration that causes of pressure pulsations, so just noise can not be reduced to low-frequency noise level.

Figure 10 shows near near, the measurement result that reaches near the resonance frequency of stator iron core of lid tap hole of 5 time spaces of cylinder in the past, 10 air gaps of employing circle, because whole interfaces in space 10 are formed by rigid walls, therefore, clearly sympathetic response pattern is many, and the acoustic pressure absolute value is big.

The objective of the invention is, can reduce significantly by discharging gas pressure pulse gas column sympathetic response in the caused seal container and the rotary compressor that reduces noise in operating by the caused vibration of pressure pulsation in the revolution compressing member cylinder thereby provide a kind of.

In order to finish above-mentioned purpose, according to the present invention, the revolution compressing member that bottom in inner bottom part accumulates the seal container that refrigerator oil is arranged is equipped with electric element and is driven by this electric element, the cylinder of this revolution compressing member is contained between the main bearing and supplementary bearing that pivotally supports aforementioned electric element axle, and engage and fix with interior all sidewalls of seal container, and, form the space between the lower surface of the upper-end surface of this cylinder and electric element, the part at this interface, space forms with sound absorbing material.

That is to say, the present invention is by adopting said structure, because interface, the space part between the upper-end surface of revolution compressing member cylinder and the lower surface of electric element is formed by sound absorbing material, acoustic absorptivity by means of sound absorbing material, resonance frequency in this space is moved through high order, thereby reduced low frequency.

In addition, the part at interface, space is the end face of cylinder, and in the occasion that adopts circular cylinder, owing to increased with the junction of seal container, so, the exciting of caused high frequency vibration of being pulsed by inner pressure of air cylinder can be suppressed to minimum.Make the reduction that relates to noise level on a large scale become possibility, thus, reached the purpose that reduces noise in operating from low-frequency region to the high frequency zone.

Further, the area that forms the cylinder upper-end surface at interface, a space immerses 50% or more in the refrigerator oil as sound absorbing material, thus, has reduced the sound pressure level in the space, simultaneously, makes resonance frequency pass through high order and moves.

Further, be the 45%-85% of cylinder integral thickness with the thickness setting between both ends of the surface about the cylinder, thus, can make the cylinder light, reduced expense, realized the whole light of compressor.

Fig. 1 is rotary compressor one an embodiment's of the present invention major component sectional view.

Fig. 2 turns round the integral thickness of compressing member cylinder and the planimetric map of the area ratio of end surface thickness with Fig. 1 that oblique line is represented.

Fig. 3 is the planimetric map of Fig. 1 cylinder face area of the immersion refrigerator oil represented with oblique line.

Fig. 4 is the measurement result explanatory drawing that adopts the occasion space resonance frequency of circular novel cylinder.

Fig. 5 is rotary compressor of the present invention and the result's of rotary compressor noise measuring in the past comparative descriptions figure.

Fig. 6 is the major component sectional view of an example of rotary compressor in the past.

Fig. 7 is the planimetric map of the type of inkfish in the past cylinder shown in Figure 6.

Fig. 8 is the major component sectional view of other example of rotary compressor in the past.

Fig. 9 is the planimetric map of circular cylinder in the past shown in Figure 8.

Figure 10 is the measurement result explanatory drawing of employing circular cylinder time space resonance frequency in the past shown in Figure 8.

Below, being described in detail one embodiment of the present of invention referring to figs. 1 through Fig. 5, rotary compressor of the present invention has the essentially identical overall structure of rotary compressor with the employing circular cylinder of Fig. 8 and structure in the past shown in Figure 9.

That is to say, rotary compressor of the present invention as shown in Figure 1, bottom in inner bottom part is stored the seal container 1 that refrigerator oil O is arranged, the revolution compressing members 4 that electric element 2 are housed and drive by the axle 3 of this electric element 2, the cylinder 5 of this compressing member 4 is contained between the main bearing 6 and supplementary bearing 7 that pivotally supports 23 of electric elements by covering 8, this cylinder 5 engages and fixes with interior all side wall surface 1a of aforementioned seal container 1, and forms space 10 between the lower surface 2a of the upper-end surface of aforementioned cylinder 5 5a and electric element 2.

In addition, aforementioned cylinder 5 adopts graphic structure shown in Figure 2, the upper-end surface 5a of cylinder 5 is interfaces of aforesaid space 10, shown in Fig. 2 oblique line, the thickness T 1 about it between both ends of the surface 5a, the 5b is set at the 45-85% of cylinder integral thickness T, and shown in the oblique line of Fig. 3, immersing more than 50% among the refrigerator oil O of its upper-end surface 5a area, the level of pasta L is raise, and this refrigerator oil O is as sound absorbing material, and also an interface as aforesaid space 10 is used.

The reason of setting for more than 50% as for the area that immerses the cylinder 5 upper-end surface 5a among the refrigerator oil O is, when calculating the sound field characteristic in the confined space usually, the occasion that on the interface, space, has sound absorbing material, the acoustic impedance of vertical incidence will no longer be calculated, but, on the border at the interface of this sound absorbing material and other interface of forming by rigid walls, particle rapidity is accelerated, the tendency that acoustic pressure under the resonance frequency is uprised is arranged, in addition, when compare with the acoustic pressure at the interface of being made up of rigid walls in the sound absorbing material interface, sound absorbing material interface one side has the tendency that reduces acoustic pressure significantly.

Further, the 5a of both ends of the surface up and down of aforementioned cylinder 5, thickness T 1 between 5b, the area ratio that cylinder integral thickness T is produced is set at 45%-85%, its reason is, if 85% when above, the possibility that the pasta L of refrigerator oil O becomes rigid plane is very big, can not reach the purpose that reduces low Boeing, in addition, if 45% when following, by shrink fit to the housing of seal container 1 and pre-welding etc. cause that cylinder bore diameter and blade neck width produce big distortion, but also can make the compressor body performance be subjected to great influence, the vibration of seal container itself can not obtain complete inhibition, can not reach the purpose that reduces high Boeing.

Fig. 4 shows and adopts design of the present invention, for example adopt the occasion of circular new shape cylinder 5, space 10 air gaps are neighbouring, the lid tap hole is neighbouring and near the measurement result of the resonance frequency that stator iron core is, compared by the situation that rigid walls forms in whole interfaces in the space 10 when adopting circular cylinder 5 in the past shown in Figure 10, its sympathetic response call by pattern is with minimizing, and clearly the acoustic pressure absolute value has also diminished.

Further, figure 5 illustrates the result that rotary compressor of the present invention and rotary compressor noise in the past compare, the upper-end surface 5a that dot and dash line circle (1) among the figure is illustrated in low-frequency region cylinder 5 immerses the effect that refrigerator oil O is produced, and the circle of the dot and dash line among the figure (mouth) is illustrated in the effect that the high frequency zone adopts circular cylinder 5 of the present invention to be produced, thus, according to the characteristic of frequency (Hz) A, reached sound pressure level (dB) has been reduced about 3dB.

As can be seen from the above description, the revolution compressing member that the present invention is equipped with electric element and is driven by this electric element in the bottom in inner bottom part is stored the seal container that refrigerator oil is arranged, the cylinder of this revolution compressing member is contained between the main bearing and supplementary bearing that pivotally supports aforementioned electric element axle, and engage and fix with interior all sidewalls of aforementioned seal container, and, be formed with the space between the upper-end surface of cylinder and the lower surface of aforementioned electric element, the part at this interface, space is formed by sound absorbing material, by means of the acoustic absorptivity that sound absorbing material had, can high order move resonance frequency in this space, thus, reduced low frequency, the noise when having reduced running.

In addition, because the part at interface, space is the end face of cylinder, and, in the occasion that adopts circular cylinder, increase the junction of seal container, cylinder pressure can be pulsed thus causedly excites the high frequency vibration suppression to minimum, reduced from low-frequency region to the high frequency zone on a large scale in noise level.

Further, in claim 2, immerse 50% or more in the refrigerator oil as sound absorbing material owing to form the area of the cylinder upper-end surface at interface, a space, so reduced the sound pressure level in space, the resonance frequency high order is moved.

Further, in claim 3,, therefore can make the cylinder light, thereby the expense that realized is low, the purpose of the whole light of compressor because the thickness setting between both ends of the surface is 45%～85% of a cylinder integral thickness about the cylinder.

Claims (3)

1. rotary compressor, it is characterized in that, bottom in inner bottom part stores the seal container of refrigerator oil, the revolution compressing member that electric element is housed and drives by this electric element, the cylinder of this revolution compressing member is contained between the main bearing and supplementary bearing that pivotally supports aforementioned electric element axle, and engage and fix with interior all sidewalls of seal container, and, be formed with the space between the upper-end surface of this cylinder and the lower surface of aforementioned electric element, the interface in this space is formed by sound absorbing material.

2. rotary compressor according to claim 1 is characterized in that, the area of cylinder upper-end surface that forms an interface in described space immerses more than 50% in the refrigerator oil as sound absorbing material.

3. rotary compressor according to claim 1 and 2 is characterized in that, the thickness setting between the upper/lower terminal face of cylinder is the 45-85% of cylinder integral thickness.

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