Pumps – Expansible chamber type – Valved piston
Patent
1974-09-13
1977-09-20
Freeh, William L.
Pumps
Expansible chamber type
Valved piston
92137, F04B 2104, F01B 900
Patent
active
040493652
ABSTRACT:
A pump of the reciprocating plunger type for use in an oil well in which structure is provided for pulling downwardly on the pump plunger during its downward stroke rather than relying upon the pump rod or sucker rod to push the plunger downwardly thereby eliminating lateral deflection of the pump rod or sucker rod and resultant wear and damage which frequently occurs especially when pumping heavy crude oil or the like. One embodiment of this structure involves a tension member connected with the walking beam and extending downwardly below the plunger, around a roller assembly or the like and then back upwardly for connection with the bottom of the plunger so that as the walking beam moves downwardly to move the pump plunger downwardly, the tension member will be tensioned for pulling the plunger downwardly without applying compressive force to the pump rod or sucker rod. Another embodiment of this structure provides a weight attached to the bottom of the plunger with the weight being reciprocal in a closed chamber so that it is not in contact with the fluid being pumped. The pump barrel is provided with a desander between the plunger and the standing valve and is in the form of a rod projecting upwardly in the pump barrel for extending into the lower hollow end of the pump plunger for removing sand therefrom to prevent sand from filling or clogging the lower end of the plunger.
REFERENCES:
patent: 195253 (1877-09-01), Barnes
patent: 856271 (1907-06-01), Linthicum
patent: 1043279 (1912-11-01), Wheeler
patent: 1163535 (1915-12-01), Hazard
patent: 1268964 (1918-06-01), Hahn
patent: 1640406 (1927-08-01), Hawkins
patent: 1832346 (1931-11-01), Yerkes et al.
patent: 1970295 (1934-08-01), Fitzpatrick
patent: 3143080 (1964-08-01), Sutliff
patent: 3777626 (1973-12-01), Schurenberg et al.
Freeh William L.
Jacobson Harvey B.
O#Brien Clarence A.
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