阅读说明：本技术 双缸旋转式压缩机及其曲轴 (Double-cylinder rotary compressor and crankshaft thereof ) 是由 黄勇 郑婷婷 于 2018-08-31 设计创作，主要内容包括：本发明公开了一种双缸旋转式压缩机及其曲轴,双缸旋转式压缩机包括：壳体；压缩机构；曲轴,所述曲轴包括主轴以及设在所述主轴上的上偏心部和下偏心部,所述上活塞套设在所述上偏心部上且所述下活塞套设在所述下偏心部上；驱动机构,所述驱动机构设在壳体内且与所述主轴传动连接,其中,所述上偏心部的质量大于所述下偏心部的质量,所述上偏心部的质心与所述主轴的中心轴线之间的距离大于所述下偏心部的质心与所述主轴的中心轴线之间的距离,所述驱动机构仅一端设有平衡块。根据本发明的双缸旋转式压缩机,不仅可以减少平衡块的数量,而且可以大幅减轻保留下来的平衡块的重量,成本低、磨损小、油面和吐油量好。(The invention discloses a double-cylinder rotary compressor and a crankshaft thereof, wherein the double-cylinder rotary compressor comprises: a housing; a compression mechanism; the crankshaft comprises a main shaft, an upper eccentric part and a lower eccentric part, wherein the upper eccentric part and the lower eccentric part are arranged on the main shaft; the driving mechanism is arranged in the shell and is in transmission connection with the main shaft, wherein the mass of the upper eccentric part is larger than that of the lower eccentric part, the distance between the center of mass of the upper eccentric part and the central axis of the main shaft is larger than that between the center of mass of the lower eccentric part and the central axis of the main shaft, and only one end of the driving mechanism is provided with a balance block. According to the double-cylinder rotary compressor disclosed by the invention, the number of the balance blocks can be reduced, the weight of the reserved balance blocks can be greatly reduced, the cost is low, the abrasion is small, and the oil level and the oil output are good.)

1. A double-cylinder rotary compressor, comprising:

a housing;

the compression mechanism is arranged in the shell and comprises an upper air cylinder, an upper piston, a lower air cylinder, a lower piston and a partition plate arranged between the upper air cylinder and the lower air cylinder, the upper air cylinder is provided with an upper compression cavity, the lower air cylinder is provided with a lower compression cavity, the upper piston can roll along the inner wall of the upper compression cavity, and the lower piston can roll along the inner wall of the lower compression cavity;

the crankshaft comprises a main shaft, an upper eccentric part and a lower eccentric part, wherein the upper eccentric part and the lower eccentric part are arranged on the main shaft;

a driving mechanism arranged in the shell and connected with the main shaft in a transmission way, wherein,

the mass of the upper eccentric part is larger than that of the lower eccentric part, the distance between the mass center of the upper eccentric part and the central axis of the main shaft is larger than that between the mass center of the lower eccentric part and the central axis of the main shaft, and only one end of the driving mechanism is provided with a balance block.

2. The double-cylinder rotary compressor of claim 1, wherein the lower eccentric portion and the balance weight are respectively disposed opposite to the upper eccentric portion in a radial direction of the main shaft.

3. The dual-cylinder rotary compressor of claim 2, wherein a center of mass of the upper eccentric portion, a center of mass of the lower eccentric portion, and a center of mass of the balance weight are located in a same vertical plane.

4. The dual cylinder rotary compressor of claim 3, wherein the vertical plane is a plane passing through a central axis of the upper eccentric portion and a central axis of the main shaft.

5. The dual cylinder rotary compressor of any one of claims 1-4, wherein the driving mechanism comprises:

a stator disposed within the housing;

the rotor is rotatably arranged in the stator and sleeved on the main shaft, and the balance block is arranged at the upper end or the lower end of the rotor.

6. A crankshaft for a dual cylinder rotary compressor, comprising:

a main shaft;

the eccentric portion is arranged on the main shaft, the mass of the upper eccentric portion is larger than that of the lower eccentric portion, and the distance between the mass center of the upper eccentric portion and the central axis of the main shaft is larger than that between the mass center of the lower eccentric portion and the central axis of the main shaft.