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Hermetic Compressor
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A technology of hermetic compressor and compression mechanism, applied in the direction of rotary piston machinery, mechanical equipment, engine components, etc., can solve problems such as increase and increase of friction loss
Active Publication Date: 2014-04-16
LG ELECTRONICS INC
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[0004] In this way, if a bearing supporting the rotating shaft is added, the contact area between the bearing and the rotating shaft increases, and this increased contact area also causes an increase in friction loss
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example 1
[0063] Example 1) In the case of C1 / C2=0.55
[0064] When C1 / C2 is set to 0.55, the lubrication state of the upper bearing 500 is detected, an example of the state is as follows:
[0070] In the above conditions, the Sommerfeld number (S0) is calculated as follows:
[0071] S0=(R / C) 2 ·ηN / P=1.710
[0072] Using the Soxhlet number (S0) obtained as described above, the eccentricity of the crankshaft in the upper bearing at the time of rotation is obtained by the following equation:
[0073] lnX=C 0 +C 1 S0+C 2 S02+C 3 S03+C 4 S04
[0074] here
[0075] C 0 =-6.733511e-2+5.953856e-2*(L / D)-7.877801e-3*(L / D) 2
[0076] C 1 =0.0173906-4.3371078*(L / D)-0.41195896*(L / D) 2
[0077] C 2 =2.0091537+0.5112015*(L / D)+4.083148*(L / D) 2
[...
example 2
[0084] Example 2) C1 / C2 = 11.5
[0085] For another example, if C1 / C2 is set to 11.5, based on the above formula, the Soxhlet number (S 0 ) was 0.039, and the eccentricity (X) was calculated to be 0.958. In this case, the minimum oil film thickness (h m ) is calculated to be 0.0047mm.
[0086] In this case, the Soxhlet number is relatively small, but the minimum oil film thickness is 4.7 μm, so a sufficient oil film can be formed between the crankshaft and the bearing. Therefore, even if a load is applied to the shaft, the shaft can be supported by the oil film, and thus the shaft and the bearing do not come into contact with each other. In other words, in this case, it can be seen that the compressor falls into the fully lubricated region.
[0087] on the other hand, Figure 4 is a graph showing changes in input work (compression work) based on the value of C1 / C2. As shown in the figure, when the value of C1 / C2 is less than 1 or greater than 11.5, it can be seen that the ...
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Abstract
Disclosed herein is a hermetic compressor including a hermetic container; a rotation drive unit provided at an inner portion of the hermetic container; a rotation shaft combined with the rotation drive unit; a compressor mechanism combined with the rotation shaft to inhale and compress refrigerant; a first bearing fixed to the compressor mechanism to support the rotation shaft; and a second bearing fixed to the hermetic compressor to support an end portion located apart from the first bearing on the rotation shaft, wherein a tolerance (C1) between the second bearing and rotation shaft is 0.55-11.5 times greater than a tolerance (C2) between the first bearing and rotation shaft.
Description
technical field [0001] The present invention relates to a hermetic compressor, more particularly, to a hermetic compressor in which bearings are provided at both upper and lower ends of a crankshaft. Background technique [0002] In general, a hermetic compressor is provided with a driving motor that generates a driving force in an inner space of a hermetic container, and a compression mechanism that operates in combination with the driving motor to compress refrigerant. In addition, hermetic compressors may be classified into reciprocating compressors, scroll compressors, vibration compressors, and the like. The compression method of the reciprocating compressor and the scroll compressor utilizes the rotational force of the drive motor, while the compression method of the vibratory compressor utilizes the reciprocating motion of the drive motor. [0003] In the hermetic compressor described above, a driving motor of the hermetic compressor using a rotational force is provi...
Claims
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