PUMP BODY ASSEMBLY AND FLUID MACHINERY HAVING SAME

A pump body assembly and fluid machinery, the pump body assembly comprising: an air cylinder assembly, which comprises an air cylinder (10), a roller (20) and a sliding piece (30), wherein the air cylinder (10) is provided with an inner cavity (11) and a sliding piece groove (12) that communicates with the inner cavity (11), the roller (20) is rotatably arranged in the inner cavity (11), the sliding piece (30) is slidably arranged in a sliding piece groove (12), and the head of the sliding piece (30) is in contact with the outer peripheral surface of the roller (20); and a crankshaft (40), which is penetratively arranged on the air cylinder assembly, wherein the crankshaft (40) comprises an eccentric part (41), the eccentric part (41) is located in the inner cavity (11), and the roller (20) is sleeved on the eccentric part (41). The ratio of the eccentricity e of the eccentric part (41) to the inner radius R of the air cylinder (10) is 0.15-0.195 or 0.21-0.225 or 0.235-0.27, which ameliorates the problem in t