Drying and gas or vapor contact with solids – Process – Diverse types of drying operations
Patent
1993-03-10
1995-07-11
Gromada, Denise L.
Drying and gas or vapor contact with solids
Process
Diverse types of drying operations
34519, 34 68, 34236, F26B 700
Patent
active
054309573
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an installation for the temperature control of chemical and/or biochemical and/or microbiological substances comprising average temperature that can be pre-determined, as well as at least one further region, substances and/or for receiving vessels for the substances and can be brought into thermal contact via at least one of its outer surfaces with the metal block arrangement, one outer surface and the metal block arrangement, a pressure which deviates from the ambient pressure and path into one of the regions of the metal block arrangement, as desired.
The invention also relates to a process for the temperature control of chemical and/or biochemical and/or microbiological substances comprising the steps of: pre-determined temperature, one recess provided in a metal support plate, it being possible to bring the support plate, via at least one of its outer surfaces, into thermal contact with the metal block arrangement, plate and the metal block arrangement in order to improve the thermal contact. WO-A-9005947.
The metal block arrangement in the known installation is a metal rail which has a U-shaped cross-section and is cooled at one of its ends and heated at its other end. In this way, an approximately linear temperature gradient, the slope (K/cm) of which is determined by the spatial distance and the temperature difference between the two thermostat-controlled ends of the metal rail, is produced in the metal rail.
In addition, it is known to provide additional temperature-control devices between the temperature-controlled ends of the metal rail, in order to produce sections having temperature gradients of different slopes along the metal rail. By this means, for example, temperature regions with a relatively flat temperature gradient and/or temperature regions with a very steep temperature gradient are produced.
The known installation also has a support plate arranged between the legs of the metal rail, which support plate is provided with bores to receive plastic reaction vessels in which the substances to be temperature-controlled are placed. The support plate is transported by means of a transport device into the region of the metal rail which has the desired temperature that the substances are to assume. To ensure the heat exchange required for this purpose, the support plate is in thermal contact via its bottom surface and its two front faces with the base and, respectively, the inner surfaces of the legs of the U-shaped metal rail.
On either side of the support plate two toothed belts are attached which are passed via deflection pulleys in the longitudinal direction of the metal rail around the latter and are each driven via a toothed wheel in such a way that they can pull the support plate backwards and forwards in the U of the metal rail in order thus to move it to different temperature regions.
In order to improve the thermal contact between the support plate and the metal rail it is proposed in the case of the known installation to draw the support plate against the metal rail by suction, by applying a partial vacuum.
A disadvantage of the known installation is that the support plate, which is very high compared with its longitudinal extent, very easily tips when being pulled into a different temperature range, so that the transport of the support plate can proceed only very slowly. Moreover, when overcoming high temperature gradients it frequently occurs that the front faces of the support plate jam between the legs of the U-shaped metal rail because of the expansion associated with the change in temperature, so that no further transport is possible. The operators must intervene manually, in order to make the transport device moveable again.
Because the speed with which the support plate travels is only slow, the times which are needed to change the temperature of the substances transported with the plate is undesirably high, particularly in the context of modern biochemical methods.
Moreover, for many reactions temperature regions are needed which are clearly below th
REFERENCES:
patent: 4778143 (1988-10-01), Koshiba
Eigen Manfred
Simm Wolfgang
Weise Roderich
Gromada Denise L.
Max-Planck-Gesellschaft zur Forderung der Wissenschaften e.v.
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