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Liquid feed pump apparatus

A fluid supply and pump device technology, applied in the field of fluid supply pump devices, can solve problems such as vibration and turbulence

Inactive Publication Date: 2005-05-25
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, vibration and turbulence may occur in the fluid supply

Method used

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  • Liquid feed pump apparatus

Examples

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Embodiment Construction

[0014] Hereinafter, a description will be given of a specific embodiment.

[0015] attached figure 1 is a fluid channel diagram showing an example, not limited to the basic structure of the embodiment, in which the present invention is applied to a double piston pump.

[0016] The fluid supply pump device according to the present embodiment is composed of two pump mechanisms. The pump head 7 of the first pump mechanism includes a piston 4 a, an inlet stop valve 8 and an outlet stop valve 6 . In this pump head 7, when the piston 4a is moved to the right in the figure (retracted state), the shut-off valve 8 is opened and the shut-off valve 6 is closed. This allows fluid to be sucked in from the inlet port 14 and accumulated in the cavity 7 a formed in the pump head 7 . When the piston 4a moves to the left of the figure (stretching into the state), the shut-off valve 6 is opened and the shut-off valve 8 is closed, so that the fluid accumulated in the cavity 7a is pushed out by...

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Abstract

The present invention discloses a fluid supply pump device, wherein the regulating channel is connected in parallel with the first and the second pump mechanism. The fluid sent from the pump head is separated, a part of the fluid is sent to the outlet side, and the remaining fluid is returned to the inlet side through the regulating channel. The regulating channel has a restrictor to set the flow rate to 100μL / min to 1mL / min, 2MPa to 20Mpa or about the pressure. In micro-LC and ultra-miniature LC, the volume flow rate is 100nL / min to 10μL / min or so, and the pressure is several MPa to 20MPa or so. Thus, 0.1% to 1% of the fluid sent from the pump mechanism is delivered from the outlet port, while the remainder flows through the regulating passage and is returned to the inlet port side.

Description

technical field [0001] The invention relates to a fluid supply pump device for supplying a fluid, such as an eluent for a liquid chromatograph. Background technique [0002] This application claims the benefit of foreign priority from Japanese Patent Application JP2003-382678 filed on November 12, 2003, the contents of which are hereby incorporated by reference in their entirety. [0003] In the prior art, the following two Systems are known: in one system, the flow of mobile phase with a flow rate of 100 to 1000 μL / min can be divided by using a separator, so that the fluid is only supplied at the required flow rate (separated system); Small amounts of fluid are drawn in and supplied directly (direct system). [0004] In the fluid supply pump of the separation system, since the resistance of the separator changes with time, it is difficult to ensure the stability of the flow rate for a long time. In addition, there is a problem that since the separated mobile phase is dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/32F04B11/00F04B49/24G01N30/26
CPCF04B11/005F04B49/24
Inventor 丸山秀三
Owner SHIMADZU SEISAKUSHO CO LTD