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Solvent delivery pump

A technology for supplying liquid pumps and pump chambers, which is applied to pumps, pump components, variable-capacity pump components, etc., which can solve the problems of space reduction and achieve the effects of reducing load, preventing life expectancy, and shortening time

Inactive Publication Date: 2012-01-11
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a limit to the reduction of the space between the inner wall of the pump chamber and the profile of the plunger

Method used

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  • Solvent delivery pump
  • Solvent delivery pump
  • Solvent delivery pump

Examples

Experimental program
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Embodiment Construction

[0018] A first embodiment of the liquid supply pump will be described using FIG. 1 . The liquid supply pump in this embodiment is composed of a cylinder body 2 and a pump head 8 . The cylinder body 2 accommodates a slider 4 inside. The slider 4 holds the end surface on the base end side of the plunger 3 and is pressed against the peripheral surface of a cam (not shown) by the elastic force of the spring 6 . The cam is rotated by a driving motor (not shown), so that the slider 4 and the plunger 3 reciprocate along with the peripheral surface of the cam.

[0019] The pump head 8 is installed on the cylinder body 2 . The pump head 8 has a pump chamber 8a, a liquid suction flow path 8b, and a liquid discharge flow path 8c, and the pump head 8 performs suction and discharge of liquid by the reciprocating motion of the tip portion of the plunger 3 held by the slider 4 . The liquid suction flow path 8b and the liquid discharge flow path 8c are respectively provided with check valv...

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PUM

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Abstract

A solvent delivery pump is provided, which includes: a cylindrical pump chamber, an inside of which is made of metal; a plunger inserted from a tip end into the pump chamber to reciprocate in a certain direction to increase and decrease a capacity in the pump chamber; a capacity decreasing member made of resin and covering at least a portion of an inner wall of the pump chamber to reduce a clearance from the plunger; and a seal member provided to a plunger insertion portion of the pump chamber to come in sliding contact with an outer peripheral face of the plunger to seal the pump chamber. Preferable examples of the capacity decreasing member are a cylindrical sleeve covering at least a portion of an inner peripheral face of the pump chamber, a spacer disposed on an innermost face of the pump chamber to reduce a clearance from a tip end face of the plunger which has reached a top dead center, or both of the sleeve and the spacer.

Description

technical field [0001] The present invention relates to a liquid supply pump which sucks and discharges liquid by reciprocating a plunger in a pump chamber. Background technique [0002] A general plunger-type liquid supply pump changes the volume of the space in the pump chamber by causing the plunger to reciprocate in the cylindrical pump chamber, thereby sucking liquid into the pump chamber and discharging the sucked liquid. Generally, sapphire (Japanese: サファイア) is used as the material of the plunger, and stainless steel is used as the material of the pump chamber. [0003] This type of liquid supply pump is designed to minimize the space between the inner wall of the pump chamber and the outer shape of the plunger when the plunger reaches the top dead center (the state where the liquid is discharged and suction starts). If there is a large space between the inner wall of the pump chamber and the outer shape of the plunger, when the plunger reaches the top dead center, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B19/00
CPCF05C2225/00F04B13/00F04B53/16
Inventor 麻生喜昭
Owner SHIMADZU SEISAKUSHO CO LTD