CZ201382A3 - Heating device with isothermal heating surface - Google Patents

Abstract

An isothermal heating surface heating device comprising an auxiliary heater (3, 3a) of a container shape, the outer surface of which is provided with a heating wire (4, 4a), and a main heater (5, 5a) mounted thereon, the surface of which is facing the auxiliary heater (3, 3a) is provided with a heating wire (6, 6a) and an isothermal heating surface (2, 2a) is provided on the surface facing away from the auxiliary heater (3, 3a), and between the main heater (5 5a) and an insulating layer (7, 7a) is provided by the auxiliary heater (3, 3a).

Description

Technical field

The invention relates to a heating device with an isothermal heating surface for applications with high requirements for uniformity of temperature distribution over the surface.

BACKGROUND OF THE INVENTION

In research, researchers often face the need to create a heating device that has an isothermal, that is, a constant areal distribution of temperature throughout its heating surface, with a minimum temperature deviation over the entire heated surface or space.

At present, the heating surfaces are solved by means of a single heating coil system located near the surface of the heating plate. However, such heating surfaces have a temperature gradient on the surface several times greater than the requirements of peak processes, eg in chemistry or biology, especially if they are to be operated over a wider range of ambient temperatures. If a massive mass plate or mass body is used in applications where it is necessary to cool the body in real time, there is a disproportionate increase in experiment time and heating costs.

It is therefore an object of the present invention to provide a heating device that allows the surface temperature to be maintained uniformly within a defined region with a minimum temperature deviation and the possibility of relatively rapid temperature control and quicker cooling.

SUMMARY OF THE INVENTION

The above-mentioned drawbacks are remedied to a large extent by a heating device with an isothermal heating surface, which consists in that it consists of an auxiliary heater in the form of a container, the outer surface of which is provided with a heating wire. the heating element is provided with a heating wire and an isothermal heating surface is provided on the surface facing away from the auxiliary heater, and an insulating layer is arranged between the main heater and the auxiliary heater.

In a preferred embodiment, the insulating layer comprises two layers of glass fabric interspersed with a silicone film.

In another preferred embodiment, the auxiliary heater and / or the main heater is made of aluminum.

In another preferred embodiment, the isothermal heating surface is formed on the upper surface of the main heating element.

In another preferred embodiment, the isothermal heating surface is formed in the cavity in the upper surface of the main heating element

In another preferred embodiment, the isothermal heating surface is provided with additional insulation.

Overview of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a heating device with an isothermal heating surface according to a first embodiment of the invention; FIG. 2 is a front view of a heating device of FIG. according to the invention and Fig. 4 is a front view of the heating device of Fig. 3.

DETAILED DESCRIPTION OF THE INVENTION

Fig. 1 shows a heating device 1 with an isothermal heating surface 2 according to a first embodiment of the invention, which consists of a auxiliary heater 3 in the form of a container, the outer surface of which is provided with a heating wire 4 and a main heating element 5 facing the auxiliary heater 3 is provided with a heating wire 6 and whose upper surface is an isothermal heating surface 2.

An insulating layer 7 is arranged between the main heater 5 and the auxiliary heater 3. The insulating layer 7 preferably consists of two layers of glass fabric interspersed with a silicone foil and ensures uniform temperature distribution over the isothermal heating surface 2 so as not to cause an uneven temperature distribution. auxiliary heater 3.

The auxiliary heater 3, like the main heater 5, is made of aluminum.

The isothermal heating surface 2 may be provided with additional insulation not shown in the figures.

The temperature of the main heater 5 or main heating wire 7 is controlled by the main heater controller 8. The temperature of the auxiliary heater 2 or auxiliary heating wire 6 is controlled by the auxiliary heater 9 or is derived from the actual temperature of the main heater 5. the body 3 may have a temperature higher, lower or equal to the temperature of the main heater 5, depending on the thermal conditions and the properties of the heating system.

The main heater 8 maintains the desired set temperature on the main heater 5, while the auxiliary heater 9 maintains on the auxiliary heater 3 a temperature close to the desired maintained temperature on the main heater 5 so as to minimize at the edges of the isothermal heating surface 2 of the main heater 5. leakage of heat into the environment and thus there was no local drop in temperature of the isothermal heating surface 2 of the main heating element 5.

When the heating operation is started, both heaters 3 and 5 heat simultaneously.

Giant. 2 shows a second embodiment of the spatial arrangement of a heating device 1a with an isothermal heating surface 2a. The auxiliary heater 3a is here in the form of a cylindrical vessel, which is provided with an auxiliary heating wire 4a on its outer walls and is provided with insulation 7a on the inner walls. Into the interior of the auxiliary heater 3a is inserted a main heater 5a, which is provided on its outer walls with a main heating wire 6a, and in its upper surface is provided with a cavity 10, which may also be in the form of recesses and the like.

The walls of the cavity 10 may be provided with insulation (not shown) in the figures.

The use of the above-described heating device 6 with an isothermal heating surface 2 according to the invention is particularly suitable for the analysis of body fluids by means of test strips where a constant surface temperature is required, or in automata for processing immunoblots and westemblots.

Claims (6)

PATENT CLAIMS 1. Heating apparatus with an isothermal heating surface, characterized in that it comprises a container-shaped auxiliary heater (3, 3a), the outer surface of which is provided with a heating wire (4, 4a), and a main heating element (5, 5a). ), the surface facing the auxiliary heater (3, 3a) is provided with a heating wire (6, 6a) and an isothermal heating surface (2, 2a) is provided on the surface facing away from the auxiliary heater (3, 3a), between the main an insulating layer (7, 7a) is provided by the heating element (5, 5a) and the auxiliary heating element (3, 3a). Heating device according to claim 1, characterized in that the insulating layer (7, 7a) is formed by two layers of glass fabric interspersed with silicone foil. Heating device according to claim 1, characterized in that the auxiliary heater (3, 3a) and / or the main heater (5, 5a) is made of aluminum. Heating device according to claim 1, characterized in that the isothermal heating surface (2, 2a) is formed on the upper surface of the main heating element (5, 5a). Heating device according to claim 1, characterized in that the isothermal heating surface (2, 2a) is formed in a cavity (10) in the upper surface of the main heating element. Heating device according to either of Claims 4 or 5, characterized in that the isothermal heating surface (2, 2a) is provided with additional insulation.