Title:
【発明の名称】バルブレス確動変位計量ポンプ
Document Type and Number:
Japanese Patent JPH0819898
Kind Code:
B2
Abstract:
A valveless, positive displacement metering pump is provided by the invention. Such a pump includes a housing (22), a working chamber (24) within the housing (22), a piston (82) within the working chamber (24), the piston (82) including a duct (86) defined by a portion of its outer surface, one or more inflow ports (96) communicating with the working chamber, one or more outflow ports (96) communicating with the working chamber (24), and a drive cylinder (66) for simultaneously rotating the piston (82) and causing it to move in back and forth strokes within the working chamber (24). The housing (22) is rotatable with respect to the piston (82) to adjust the timing of the fluid communication between the duct (86) and the inflow and outflow ports (96), respectively. Such adjustments in timing allow the flow rate of the pump to be fine tuned, and allow each port (96) to experience a partial suction as well as a partial discharge. It also allows backflow to occur in an inflow line (96) to the pump, thereby cleaning any filters within the inflow line (96) or agitating a suspension from which the inflow line (95) draws fluid. It also permits suction to be applied to an cutflow line (96) at the end of a discharge stroke, thereby preventing hanging drops or strings from forming at the discharge end of the outflow line. In addition, timing adjustement allows the manufacture of relatively inexpensive pumps in which the axes of the drive cylinder (66) and working chamber (24) are maintained in fixed positions relative to each other. A method for adjusting the flow rate of a valveless, positive displacement metering pump is also provided which includes adjusting the phases at which the piston duct (86) communicates with each of the ports (96) of the pump.
Inventors:
Dennis Pinkerton
Application Number:
JP4730091A
Publication Date:
March 04, 1996
Filing Date:
February 21, 1991
Export Citation:
Assignee:
Dennis Pinkerton
International Classes:
F04B7/06; F04B13/00; F04B49/00; (IPC1-7): F04B13/00
Domestic Patent References:
| JP5276706A | ||||
| JP5383103A | ||||
| JP55180085U |
Attorney, Agent or Firm:
Shoji Fukudome
Next Patent: 往復動装置