Landfill well liquid level control pump

摘要

A liquid level control pump especially well adapted for use in landfill wells is disclosed. The pump makes use of a pump casing, a discharge tube, a control rod, first and second check valves, a float and a pivoting lever assembly for controlling the application of a pressurized fluid from an external pressurized fluid source. In one aspect the float may include a through slot which allows the control rod to pass therethrough and which helps to reduce the chance of the float hanging due to an accumulation of solids between the control rod and the float. In another aspect a removable and replaceable discharge tube sleeve may be included.

主权项

1. A liquid level control pump adapted to be lowered into contact with a fluid collecting with a wellbore, and being in communication with an external pressurized fluid source, the liquid level control pump comprising:
a pump casing; a discharge tube disposed substantially within the pump casing and having a first end and a second end, the discharge tube operable to receive fluid collecting within an area between the pump casing and an outer surface of the discharge tube, the discharge tube further including first and second ends; a first check valve disposed at the first end for controlling a flow of the fluid within the discharge tube to one direction only, out from the first end of the discharge tube; a second check valve disposed at the second end for limiting the flow of fluid to one direction only, into the pump casing; the source of pressurized fluid being in communication with the pump casing; a float arranged coaxially around the discharge tube and movable along the discharge tube toward the first and second ends; a control rod disposed adjacent the discharge tube and operably associated with the float so as to be lifted by the float as the float moves toward the first end as the area within the pump casing fills with the fluid, and then moves towards the second end as the fluid within the pump casing is pumped out through the discharge tube using a pressurized fluid from the pressurized fluid source; a pivoting lever assembly operably associated with the float for controlling the application and interruption of the pressurized fluid into the pump casing, to thus control the pumping of the fluid collecting within the pump casing out from the pump casing and into the second end of the discharge tube, towards the first end of the discharge tube; and wherein the float includes a through bore and a through slot in communication with the through bore, the through slot permitting passage of a portion of the control rod therethrough and operating to permit fluid flow about an entire periphery of the control rod as the float moves up and down adjacent an outer surface of the discharge tube, and relative to the control rod, thus reducing or eliminating a buildup of solids between the control rod and the float that could otherwise affect free sliding movement of the float along the discharge tube.