High pressure low volume pump

A small-capacity, high-pressure technology, applied in the direction of variable-capacity pump components, pumps, piston pumps, etc., can solve problems such as fragile, easy to break, and difficult to avoid precision small piston breakage

Inactive Publication Date: 2007-03-14
GILSON SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since this material is brittle and prone to breaking, there are problems
During the assembly and working p

Method used

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Embodiment Construction

[0009] Referring now to the drawings, in Figure 1, there is shown a high pressure small volume pump generally indicated at 10 and constructed in accordance with the principles of the present invention. During high pressure liquid chromatography analysis, the pump 10 is used to provide a solvent liquid mobile phase, and at a pressure of at least 600 bar at the highest, the solvent is pumped out at a small flow rate of about 50 nanoliters to about 250 microliters per minute, such as Methanol, isopropanol, acetonitrile, etc.

[0010] To achieve these desirable performance characteristics, pump 10 therefore includes a piston 12 in the form of an elongated rod having a diameter of less than about 10 millimeters, and preferably its diameter is from about 1 millimeter to about 3 millimeters. Piston 12 is formed from a crystalline material, preferably sapphire, or a material having similar properties (eg, a mineral), preferably zircon. An advantage of these materials is that they can...

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Abstract

A piston carrier (46) supports an elongated, slender piston rod (12) for reciprocation in a pump cylinder (30) to pump fluid into and out of the cylinder (30). The piston rod (12) is made of a material such as sapphire or zircon and has a diameter less than about ten millimeters, and the pump (10) can provide flows of from about 50 to about 250 microliters per minute at pressures of several hundred bars. A drive motor (18) rotates a threaded screw (58) and a drive nut (70) of a drive system (26) applies a linear drive force to the piston carrier(46). A ball and socket connection (74) between the drive system (26) and the piston carrier (46) avoids the need for precise alignment to prevent breakage of the fragile piston (12). A magnet (80) in the socket (78) holds the ball (76) in place and avoids the need for a spring or other mechanical holder. The socket (78) also includes a ring (88) of a low reluctance material surrounding the ball (76) to increase the magnetic retention force.

Description

technical field [0001] The invention relates to an improved high-pressure small-capacity pump, which is suitable for high-pressure liquid chromatography analysis. Background technique [0002] There is a need for a pump that can accurately deliver precisely measured, very small volumes of liquid at very high pressures. For example, when performing high pressure liquid chromatography (HPLC) processes, motor-driven pumps are typically used to deliver liquid solvents such as methanol, isopropanol, and the like. The trend is to use smaller amounts of solvent in the mobile phase of chromatography columns and to work at higher pressures. For example, it may be desirable to provide a pump that can deliver fluid at a low flow rate of about 50 nanoliters to about 250 microliters per minute at a pressure of several hundred bar. [0003] Piston pumps designed for such small flows must be delicate because the pump's fluid handling elements must be very small in size. Small volume HPL...

Claims

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Application Information

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IPC IPC(8): F16J1/14F16C11/00F04B9/02G01N30/32F04B53/00F04B53/14F04B53/22F16J1/01
CPCF05C2203/0873F04B53/22F04B53/147F05C2203/0852F04B53/144F04B53/14B82Y40/00
Inventor 艾蒂安·科特纳特
Owner GILSON SAS
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