Considering the difficulty of crankshaft machining (according to the actual processing technology), the single-stage two-stage fully enclosed compressor can be used with an angle type compressor, and the two columns share a crankshaft diameter, so that the crankshaft processing technology is unchanged, and only the crankshaft is lengthened. The axial length of the diameter (ie the thickness of the connecting rod), the balance weight must be matched. From the perspective of reducing vibration and noise, select 523 for the double-column angle and try to make the two rows of reciprocating mass equal. (The internal gravity of the low-pressure large piston or the aluminum alloy for the large piston can be used to reduce the mass of the low-pressure large piston. ). Considering reducing the volume of the compressor and keeping the casing of the compressor unchanged, the angle is also optional (the imbalance force caused by the second-order reciprocating inertial force of the angle compressor cannot be eliminated).

If the two-stage two-cylinder compressor adopts a type structure, the arrangement of the stages is also convenient. For the micro-compressor, the unbalanced force caused by the reciprocating inertial force, especially the second-order reciprocating inertial force is not large, and the crankshaft machining process can not be changed. Therefore, the angle-type two-stage compressor is compared with the angle-type Ma Junwei. The power balance performance explains the feasibility and advantages of the two-stage compressor from the perspective of process and manufacturing cost, as well as the energy-saving effect in the refrigerator application. The two-cylinder angle type (taking the double-column angle as an example) is a must-read for dual-cylinder dynamic development. The selection or angle of the miniature fully enclosed single-stage two-stage compressor can achieve the approximate balance of inertial force, and can make the compressor compact and reduce the compressor volume. Without changing the compressor casing, only a little crankshaft shaft diameter is added (the crankshaft manufacturing process is unchanged), and the compressor body is changed (adding a high-pressure stage cylinder, a high-pressure stage outlet buffer tank, and casting the mold and machining cylinder to the body) The fixture is newly designed and manufactured, and the cost of the mold and the special fixture is small when the batch is large. When the compressor manufacturing process is basically unchanged, the production of the micro single-machine two-stage fully enclosed compressor is completed at a small cost.

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