Pump Drive System with Hydraulic Tappets

摘要

A cryogenic pump comprising a shaft disposed in a bearing. The shaft rotates with respect to the bearing housing, and the shaft includes an end with an angled face. The pump includes a drive at one end of the bearing housing. A tappet passage is formed through the drive housing. A pushrod housing connects to the drive housing. The pump includes a piston and a tappet sliding within the tappet passage. The tappet has a base end disposed within the tappet passage and a rod end extending below the tappet end of the drive housing. A fluid cavity is in the tappet passage between the piston and the tappet. The pump includes a pushrod connected to the tappet. The angled face of the shaft rotates and drives the piston toward the drive housing, pushing fluid within the fluid cavity against the tappet, driving the pushrod away from the drive housing.

主权项

1. A cryogenic pump comprising:
a bearing housing having a shaft end and a drive end; a shaft having an upper end and a lower end disposed in the bearing housing at the shaft end and rotatable with respect to the bearing housing about a longitudinal axis, the lower end of the shaft including an angled face oriented transverse to the longitudinal axis; a drive housing having a piston end and a tappet end, the drive housing disposed at the drive end of the bearing housing, at least one tappet passage being formed through the drive housing substantially along the longitudinal axis between the piston end and the tappet end; a pushrod housing connected to the tappet end of the drive housing; at least one piston slidably disposed at least partially within the at least one tappet passage, a cavity end of the piston disposed within the tappet passage; at least one tappet slidably disposed at least partially within the at least one tappet passage, the at least one tappet having a base end disposed within the tappet passage and a rod end extending below the tappet end of the drive housing, wherein a fluid cavity substantially filled with a fluid is formed in the tappet passage between the cavity end of the piston and the base end of the tappet; and at least one pushrod disposed within the pushrod housing and connected to the rod end of the at least one tappet; wherein, during an extend stroke, the angled face of the shaft rotates and drives the at least one piston toward the tappet end of the drive housing so as to push the fluid within the fluid cavity against the base end of the at least one tappet thereby driving the at least one tappet to drive the at least one pushrod away from the drive housing into an extended position.