Pump body assembly and compressor

A pump body assembly, comprising:

• a spindle, wherein the spindle has a sliding vane chute, a back pressure oil cavity being at least a part of an oil passage is located at a tail end of the sliding vane chute, an oil outlet of the back pressure oil cavity is located at a top of the back pressure oil cavity, and a position of an oil inlet of the back pressure oil cavity is lower than that of the oil outlet of the back pressure oil cavity such that a lubrication medium enters the back pressure oil cavity through the oil inlet of the back pressure oil cavity and fills up the back pressure oil cavity and flows out from the top of the back pressure oil cavity;
• wherein the pump body assembly further comprises:
• an upper flange, wherein an oil passage structure of the upper flange is provided on a lateral surface of the upper flange facing towards the back pressure oil cavity;
• and
• a bearing cylinder, having a roller accommodating cavity and a roller command within the roller accommodating cavity, the oil outlet of the back pressure oil cavity communicates with the roller accommodating cavity through the oil passage structure of the upper flange, and the oil passage structure of the upper flange and the roller accommodating cavity are a part of the oil passage;
• wherein the oil passage structure of the upper flange comprises:
• a back pressure oil chute of the upper flange communicating with the oil outlet of the back pressure oil cavity;
• a radial oil passage hole extending along a radial direction of the upper flange, wherein at least a part of the radial oil passage hole communicates with the back pressure oil chute of the upper flange;
• and
• a communication hole, through which the roller accommodating cavity communicates with the radial oil passage hole;
• wherein the oil passage structure of the upper flange comprises an oil distribution chute, wherein the back pressure oil chute of the upper flange communicates with an inner wall of the upper flange through the oil distribution chute, and there is a gap between the inner wall of the upper flange and the spindle, such that the lubrication medium flows into the gap through the back pressure oil chute of the upper flange and the oil distribution chute;
• wherein a ratio of a cross-sectional area of the oil distribution chute to that of the radial oil passage hole is 3:7.