Sand-resistant oil-well pump

Application Number: 00110553
Application Date: 2000.06.21
Publication Number: 1281097
Publication Date: 2001.01.24
Priority Information:
International: F04B47/02
Applicant(s) Name: Hu Lianyin
Inventor(s) Name: Hu Lianyin;Hu Shengyong;Hu Chunyu
Patent Agency Code: 00000
Patent Agent:
Abstract A sand-resistant oil well pump is composed of pump barrel, plunger, oil-inlet and-outlet ball valve, and big-spiral sand scraping elastic cylinders. Said sand-scraping elastic cylinders are installed to both top ends of plunger and can be slightly and radically telescopic under the action of self elasticity and pressure of liquid column, so it can closely slide along internal surface of pump barrel to scrape sand. Its advantages include higher power to prevent jam caused by sand, high pump efficiency, and low gap leakage (decreased by 1/2-2/3 as compared with ordinary pump).