SU1670433A1 - Temperature controller - Google Patents

Abstract

This invention relates to thermal control devices. The device contains a container filled with melting material, into which electrical contacts are inserted, a base and a crystal plate made of a material of the ferroelastic type with two pairs of electrodes on planes, one of which is connected to electrocontacts, while the crystalline plate at its two opposite edges is attached to the base and the meltable substance is made of a material that is a dielectric in the solid state and an electrolyte in the molten state. 2 Il.

Description

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WITH

The invention relates to thermal control devices and is intended for use in automation systems.

The purpose of the invention is to increase the reliability of the device.

FIG. 1 shows the proposed device; Fig 2 - dependence of the output current 1Вых on temperature T

The device for temperature control consists of a vessel 1 containing a meltable substance 2 into which electrical contacts 3 are introduced. In addition, the device contains a crystal plate 4 made of ferroelastic. Two pairs of electrodes 5 and 6 are applied on it. Plate 4 is attached to base 7 at its two opposite edges. Fastening can be done in any way, for example, with a layer of epoxy resin 8 as shown in Fig. 1. One of the pairs of electrodes (any) is connected to electrical contacts 3. electrodes 5 Another pair of electrodes b serves to apply an alternating voltage supply U, for example a mains voltage of 220 V, 50 Hz. In addition, an output current 1Vyh passes through the circuit of these electrodes, the value of which does not have temperature information.

In the proposed device, a ferroelastic-ferroelectric ferroelastic is used. Such materials are characterized by the presence of spontaneous deformation and polarization, which can be switched by external electrical or mechanical action. It is these phenomena that form the basis for the functioning of the device. Suppose the circuit to which the electrodes 5 are connected to the contacts 3 is broken. If in this case an alternating voltage U is applied to the electrodes 6, then an alternating current will flow in the circuit of these electrodes Lo- when the electrodes are closed, the current increases significantly and reaches -And and lo.

Since the change in current is due to the following: When the electrodes 5 are open, an electric charge Q accumulates on them,

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shielding spontaneous polarization. This charge prevents the switching of the ferroelastic element and a current flows in the output circuit, the active component of which is due only to leakage currents on the plate ends, i.e. Out 1o If the electrodes 5 are closed, the surface charge is neutralized. In this case, under the influence of voltage U, a complete switching of the spontaneous polarization and deformation of the ferroelastic takes place, which leads to an increase in the output current to the value of 1out - I.

The material used in the fusible material is a dielectric in the solid state and an electrolyte in the molten state. This means that the solid state of this substance corresponds to an open electrode 5 and therefore to a small output current 1 Output Ho. If the substance has melted and is an electrolyte, i.e. conductor, this leads to the closure of the electrodes 5 and, ultimately, to an increase in the output current to the value I.

The device works as follows.

Capacity 1 is placed in an environment whose temperature is monitored. When the temperature reaches the value T at which the fusible substance placed in the vessel melts, an increase occurs.

2 3

Output current This current is captured by an electrical measuring instrument.

Claims (1)

The controlled temperature Tc is determined by the melting point of the substance filling the vessel. There are many materials that can be used as a fusible substance in the proposed device. Thus, salts, such as KCI, NaCI, KBr, SiCI, etc., oxides of V20s, V20z, etc., can be used. Water can also be used, which due to the presence of impurities is electrolyte and conducts electricity. When it freezes, water turns into ice, which is a dielectric. Thus, there is a wide choice of materials, and therefore the possibility of creating a set of devices for controlling temperature over a wide range. Apparatus of the Invention A device for temperature control, comprising a container with a fusible substance, a dielectric in the solid state and an electrolyte in the liquid state into which electrical contacts are inserted, characterized in that. in order to increase reliability, it is provided with a base and a crystal plate made of ferroelastic with pairs of electrodes on planes, one of which is connected to electrical contacts, and the crystal plate at its two opposite edges is attached to the base go figure 1 fig 2