PUMP ASSEMBLY, FLUID MACHINE, AND HEAT EXCHANGE DEVICE

• Main Authors: WEI, Huijun, LI, Zhi, REN, Liping, LIANG, Shebing, ZHANG, Rongting, SHI, Zhengliang, LIU, Xixing, DU, Zhongcheng, YANG, Sen, XU, Jia
• Format: Patent
• Language: English; French; German
• Published: 17.02.2021
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTMACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTPUMPS; STEAM ENGINES; WEAPONS

Provided are a pump assembly, fluid machinery, and a heat exchange device. The pump assembly includes: a lower flange (12); a lower friction-reducing ring (60); a cylinder (20), the lower friction-reducing ring (60) being disposed inside the cylinder (20), and the lower flange (12) being disposed below the cylinder (20); and a piston assembly arranged inside the cylinder (20) and includes a piston sleeve (40) and a piston (50) slidably arranged inside the piston sleeve (40). The lower friction-reducing ring (60) has a central hole. A position-limiting protrusion (43) is disposed on a surface of the piston sleeve (40), which faces the lower flange (12). The limiting protrusion (43) extends into the central hole of the lower friction-reducing ring (60), fits and is limited by the lower flange (12), thereby preventing the piston sleeve (40) from moving in a radial direction relative to the lower flange (12). The present invention solves a problem in prior art that work efficiency of the pump body assembly is affected because the piston sleeve of the pump body assembly is prone to rotate eccentrically.