Small-displacement rod type oil well pump with annular plunger

A small-displacement rod type oil well pump with an annular plunger comprises an outer pump barrel, an inner pump barrel and the annular plunger. The upper end of the outer pump barrel is connected with a supporting leather cup assembly through a lengthening coupling, and the lower end of the outer...

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Bibliographic Details
Main Authors YUAN BIFEI, SUN XUGUANG, CAO MANLI, LI NING, QU WENTAO
Format Patent
LanguageChinese
English
Published 25.06.2014
Subjects
BLASTING
HEATING
LIGHTING
MECHANICAL ENGINEERING
POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS
PUMPS
PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
WEAPONS
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Summary:A small-displacement rod type oil well pump with an annular plunger comprises an outer pump barrel, an inner pump barrel and the annular plunger. The upper end of the outer pump barrel is connected with a supporting leather cup assembly through a lengthening coupling, and the lower end of the outer pump barrel is connected with a valve housing of an oil inlet valve through a pump barrel coupling. The upper end of the inner pump barrel is connected with a sealing segment joint, and the lower end of the inner pump barrel is connected with the pump barrel coupling through a valve housing of an oil outlet valve. An annular work cavity is formed between the inner pump barrel and the outer pump barrel, the annular plunger is in small clearance fit with the inner pump barrel and the outer pump barrel, the annular plunger is connected with a valve rod through a valve rod lower joint, and the lower end of the valve housing of the oil inlet valve is connected with a tail pipe joint in a threaded mode through the lower
Bibliography:Application Number: CN20141148613