Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing liquid or solid sample
Patent
1995-06-06
1997-10-07
Alexander, Lyle A.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing liquid or solid sample
422102, 422101, 2101982, B01D 1508
Patent
active
056744552
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for axially compressing a column for chromatography in accordance with the preamble of claim 1 as well as to an apparatus for chromatography having a device of this kind.
The object of the invention is to provide an apparatus for axially compressing a column for chromatography with which the pressure to be brought to bear on a column packing is produced by mechanical means and is maintained by a energy accumulator.
This object is satisfied in accordance with the invention by the characterizing features of claim 1.
The advantages achievable with the invention are eventually to be seen in the fact that the energy accumulator automatically compensates for height differences in the packing and that existing columns can be converted in a simple manner for use with the apparatus.
An apparatus for chromatography is characterized in accordance with the invention by the features of claim 12.
In this apparatus, it is advantageous that, in order to pack up the column after withdrawing the closure body, one only has to take off the device and that, in order to expel the used up packing from the column, the closure body need only be removed and the packing subsequently ejected by the device.
The invention will be described in the following by means of example only with the aid of the accompanying drawing which shows a section through an embodiment of an apparatus for chromatography in accordance with the invention together with an embodiment of a device in accordance with the invention for the axial compression of the column.
BRIEF DESCRIPTION OF THE DRAWING
As the FIGURE shows, the apparatus essentially comprises an apparatus 1 for the axial compression of a column for chromatography and a column 2 of this kind.
The device 1 comprises a cylinder-shaped housing 3 having a flange 4 at one end and an outer thread 5 at the other end. The device 1 further comprises a cover 6 which has a through-hole and which closes off the housing 3 on one side. The device further comprises screw drive with a threaded spindle 7 which passes through the cover and a member 8 which is screwed onto the threaded spindle and contacts the inner side of the housing with its periphery. The device also includes a plunger 9 rotatably mounted at one end of the threaded spindle 7, a closure body 10 which is connected to the plunger 9 and a energy accumulator made of disc springs 11.
The plunger 9 is journalled on the threaded spindle 7 by means of a roller bearing 12 and has a threaded projection 13 onto which the closure body 10 is screwed. The member 8 is arranged in the housing 3 so as to be fixed against rotation. For this, a part 14 is provided which, on the one hand, is connected to the member 8 and, on the other hand, is guided in a slot 15 formed in the wall of the housing. This part forms an indicator means for the pressure loading of the packing in the column. The energy acculator 11 is arranged between the member 8 and the cover 6 of the housing.
The threaded spindle 7 is a hollow spindle and is provided at its other end with a hand wheel 16. In this regard, it is noted that a pneumatic, hydraulic or electrical device can be used for driving the threaded spindle 7. With a drive device of this kind and a sensor device (not shown) which is in effective connection with the indicator part 14, it is possible to effect a pressure adjustment via a control device (not shown). Depending on the requirements, a pressure control loop can be provided in the control device. A feedline 17 is guided through the threaded spindle 7 to the closure body 10 and opens out into a filter unit 18. In this regard, it is noted that a like filter unit 18 is arranged in the closure body or terminal member 24. The filter unit 18 may be formed of a sintered body. Alternatively, the filter unit 18 may include two members formed of glass, ceramic, metal, plastic or the like.
The column 2 comprises a tube 21 made of glass and a holder device 22 for the tube, whereby a constructional unit is formed. The column further comprises a closure
REFERENCES:
patent: 3770592 (1973-11-01), Noirot
patent: 4597866 (1986-07-01), Couillard
Baur Charles
Marchand Claude
Alexander Lyle A.
Labomatic Instruments
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