The present invention provides a pump body
assembly, a compressor and a heat exchange
system. The pump body
assembly includes a main shaft, a negative pressure part, an oil
pipe component, an air cylinder and a first
flange, the main shaft is provided with a hollow cavity; the negative pressure is arranged on the first end of the main shaft to form a negative pressure in the hollow cavity; the oil
pipe component is arranged on the second end of the main shaft, and is connected with the hollow cavity of the main shaft; the first
flange and the air cylinder are stacked along the axial direction of the main shaft, the end surface of one side, toward the air cylinder, of the first
flange is provided with a lubricating oil groove, and the hollow cavity of the main shaft is communicated with the lubricating oil groove. The negative pressure part is arranged at the end of the main shaft, when the negative pressure part works, the negative pressure can be formed in the hollow cavity of the main shaft, so that oil in an
oil tank of the compressor is sucked into the hollow cavity of the main shaft by the oil
pipe component, and then flows to the lubricating oil groove of the first flange under effect of the
centrifugal force of the hollow cavity brought by rotation of the main shaft to provide a reliable backpressure for a sliding piece in the air cylinder so as to effectively solve the problem of insufficient backpressure
oil supply caused by backpressure
instability.