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Piston and scraper assembly

A scraper device, piston technology, applied in the direction of the piston, measuring device, cylindrical piston, etc., can solve the problem that the scraper cannot be stopped

Active Publication Date: 2006-09-27
CYTIVA SWEDEN AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This requires very fine and expensive machining tolerances and surface treatments on the scrapers and column walls
In addition, the scraper does not prevent said liquid from coming into contact with the sealing O-ring on the piston wall
This will be a defect if the O-ring is not resistant to the fluids used in the column, such as cleaning and processing fluids

Method used

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  • Piston and scraper assembly
  • Piston and scraper assembly
  • Piston and scraper assembly

Examples

Experimental program
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Embodiment Construction

[0007] figure 1 and 2 A part of the chromatography column 1 is illustrated. The column 1 comprises a cylindrical column wall 3 with an inner diameter φC. A movable, stepped columnar piston 5 caps one end of column 1 . The piston 5 has a frontal first face 7 intended to contact the separation medium in use and is provided with a collection chamber 9 for the liquid in the column. The through hole 11 extends through the piston 5 and is connected to the collection chamber 9 through a liquid line 13 , and the liquid line 13 is connected to the rear second surface 15 of the piston 5 . The first face 7 of the piston 5 and the first portion 17 having a length L1 have a diameter φ1 smaller than the diameter φ2 of the second face 15 . The diameter φ2 of the second surface 15 and the remaining length L2 of the piston 5 are much smaller than the inner diameter φC of the column wall 3 so that the piston can move freely up and down the column 1 . The collection chamber 9 is covered by ...

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PUM

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Abstract

A piston and scraper assembly (26) for a high-pressure liquid chromatography column (1) is provided with a snap lock between the piston (5) and the scraper (25). The snap lock comprises a groove (23) in the piston wall (17), a complementary groove (39) in the inner face of the scraper (25) and a locking, sealing and biasing means such as a resilient O-ring (43) which fits into said grooves.

Description

technical field [0001] The invention relates to a piston and scraper arrangement for a high-pressure chromatographic column of the type mentioned in the preamble of the independent claim. Background technique [0002] In high-pressure chromatographic columns, the piston is usually set movable in the chromatographic column so that the chromatographic medium is compressed and dense by the piston. This results in a substantially uniform bed of separation media. The problem that arises in compressed media is that the abrasive media particles get stuck between the side wall of the piston and the wall of the column. These particles damage not only the cylinder walls but also the piston seals. US5169522 describes a high-pressure chromatographic column in which a piston is movable in the chromatographic column, wherein the head of the piston is provided with a glass frit container supporting a scraper on the column wall. The function of the scraper is to push the fill medium in f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/60F16J1/00
CPCG01N30/6021G01N30/6026
Inventor P·达尔
Owner CYTIVA SWEDEN AB