Pump body assembly, fluid machinery, and heat exchange device

A pump body assembly, comprising:

• an upper flange;
• a lower flange;
• a cylinder, arranged between the upper flange and the lower flange;
• a sliding block structure, rotatably arranged inside the cylinder, the sliding block structure comprising a connecting portion and two sliding sub-blocks arranged on the connecting portion, and the two sliding sub-blocks and an inner wall of the cylinder forming a first sliding hole;
• a piston, slidably arranged inside the first sliding hole, a variable volume cavity being formed between the piston and an inner wall of the cylinder, and the piston having a second sliding hole;
• and
• a rotation shaft, wherein at least a portion of the rotation shaft is slidably arranged inside the second sliding hole, and a slide included angle is formed between a first sliding direction, in which the piston slides relative to the first sliding hole, and a second sliding direction, in which the rotation shaft slides relative to the second sliding hole;
• wherein:
• the two sliding sub-blocks each comprise an inner side approximately perpendicular to the connecting portion, the inner side of each of the two sliding sub-blocks faces the piston and is a flat surface;
• an upper side of the sliding block structure opposite to the connecting portion is open, and upper ends of the two sliding sub-blocks opposite to the connecting portion are aligned with a top of the piston;
• there is at least one connecting portion;
• the at least one connecting portion is provided with a first through hole;
• and the rotation shaft passes through the first through hole;
• the first through hole is arranged on the at least one connecting portion;
• a position-limiting protrusion is arranged on the lower flange;
• the first through hole and position-limiting protrusion are nested and fit to connect the sliding block structure with the lower flange;
• the position-limiting protrusion extends into the first through hole to enable the sliding block structure to pivot relative to the lower flange;
• the position-limiting protrusion has a second through hole;
• and the rotation shaft passes through the second through hole.