RU176973U1 - THERMOELECTRIC MAT - Google Patents

Abstract

The utility model relates to the field of construction, in particular to thermoelectric mats with film electric heaters, designed to heat concrete and soil in order to accelerate the set of its strength and intensify land work in winter. The technical essence lies in the fact that in a thermoelectric mat, including electrical insulation a shell, inside of which there is a heat-insulating layer, a controlled thermal fuse, a film electric heater, an additional device is installed In order to control the insulation resistance, which contains the switching and measuring blocks, the switching block is located outside the thermoelectric mat, the measuring block is connected in series with the switching block by power circuits on the one hand, and the heating circuit of the film electric heater is connected on the other through the controlled thermal fuse, the measuring block is located between the heat-insulating layer and the film electric heater , which is a laminated resistive heating circuit and isolated from negative an aluminum foil emitter, the measuring unit is connected on one side by a signal circuit to a signal element, and on the other measuring circuit through a switching unit with one end to a heating circuit and the other to a radiator, the device signal element is located on the upper outer surface of the mat. confirmed by the use of well-known elements in it, with optimal performance characteristics used in the construction field, with achievement of t The technical result is to increase the electrical safety of the thermoelectric mat.

Description

The utility model relates to the field of construction, in particular to thermoelectric mats with film electric heaters intended for heating concrete and soil in order to accelerate the set of its strength and intensify the conduct of earthwork in winter.

Known thermoelectric building mat, taken as an analogue, (Technical description of the thermomat on the website http: //www.doc05.html, <URL http://istb.ru/), including a heat-insulating layer made of a polymer film, a heat-reflecting layer and a moisture-proof shell.

The disadvantage of this device is non-compliance with the heating temperature, local overheating of concrete is possible.

Known thermoelectric mat adopted for the analogue (RF patent No. 2413395, IPC Н05В 3/36), which is divided into segments interconnected on the fold line. Each segment is equipped with an independent power supply controlled by a thermal switch. Thermal insulators based on foamed polymer with a reflective layer are used as an insulating layer.

The disadvantage of the mat is the complexity of the design.

Known thermoelectric mat adopted for the prototype (patent for utility model No. 129744, IPC Н05В 3/36, publ. 06/27/2013). In the thermoelectric mat inside the insulating shell there is a heat-insulating layer, a heating layer with a resistive element, made on the basis of a flexible film, a shielding layer made of a non-woven fabric with a shielding carbon composition, and a controlled thermal fuse.

A disadvantage of the known devices is the low electrical safety, due to the existing probability of electric shock due to breakdown of insulation due to a decrease in its resistance below the permissible value.

The objective of the proposed technical solution is to increase the electrical safety of the thermoelectric mat.

The problem is solved in that in a thermoelectric mat including an insulating sheath, inside of which there is a heat insulating layer, a controlled thermal fuse, a film electric heater, in contrast to the prototype, an insulation resistance control device is additionally installed, containing switching and measuring blocks, the switching block is located outside the thermoelectric mat, with the switching unit by power circuits, the measuring unit is sequentially connected on the one hand, on the other A controlled thermal fuse is the heating circuit of the film electric heater, the measuring unit is located between the insulating layer and the film electric heater, which is a laminated resistive heating circuit and an aluminum foil radiator isolated from it, the measuring unit is connected by a signal circuit on one side to a signal element, and on the other measuring circuit through the switching unit at one end - with a heating circuit, at the other - with a radiator, a signal element t device is located on the upper outer surface of the mat.

The technical result of the utility model is to increase the electrical safety of the thermoelectric mat due to the presence of an insulation resistance control device that records the state of insulation resistance and transmits this information to operating personnel using a signal element located externally on the upper surface of the mat.

The utility model is illustrated by figures. FIG. 1 - sectional thermoelectric mat; FIG. 2 - sectional film heater; FIG. 3 is a block diagram of an insulation control device.

Thermoelectric mat (Fig. 1) contains an insulating sheath 1 made of silicone or other material. The heat-insulating layer 2 with a reflective foil screen is made of polyethylene foam. The film electric heater 3 (Fig. 2) contains an emitter 4 of thin aluminum foil laminated between the upper and middle heat-resistant electrical insulation films 5, a resistive conductive heating circuit 6 of a myandry form made of high resistance wire, laminated between the middle and lower heat-resistant electrical insulation films 5, on a film electric heater a controlled thermal fuse is fixed 8. A measuring unit 10 of the insulation resistance monitoring device is also fixed on it, followed by connected to the power circuit 9 with the switching unit 11 (Fig. 3) of this device, which is connected to the power supply network by the power circuit 12. The switching unit is located outside the thermoelectric mat and is also connected in series by the power circuit 7 through the controlled thermal fuse 8 with the heating circuit 6. Measuring unit 10 connected by a signal circuit 13 with a signal element 14, consisting of LEDs and located on the upper outer surface of the mat, and the measuring circuit 15 through the switching unit 11 is connected at one end - from to revatelnym circuit 6, the other end - to the radiator 4.

Thermoelectric mat works as follows.

In the intended use mode, the switching unit 11 supplies the mains voltage to the heating circuit 6, which heats up and heats the surface of the emitter 4. The film heater 3 together with the thermoelectric mat are heated. In this case, the power circuit 9 of the measuring unit 10 does not receive a supply voltage, and the measuring circuit 15 of this unit is not connected to the heating circuit 6. The signal element 14 does not work. During a technological break, or when necessary, when it is necessary to verify the electrical safety state of the insulation of the heating circuit 6 of the thermoelectric mat, the switching unit 11 de-energizes the heating circuit 6. Then, the switching unit 11 organizes the supply of voltage of the network 12 to the power circuits 9 of the measuring unit 10 to supply it. At the same time, the switching unit 11 commutes the measuring circuit 15 of the measuring unit 10 with one end to the heating circuit 6, the other to the emitter 4 for subsequent indication of the state of the insulation level. By the signal element 14 it is possible to judge the state of isolation. If the green LED is on, the insulation resistance is normal. If the yellow LED is on, the insulation resistance indicates its pre-failure condition. If the red LED is on - the insulation resistance is lower than permissible, immediately stop the operation of the thermoelectric mat.

For the thermoelectric mat to work in normal mode, it is necessary to reverse the switching unit 11 to disconnect the measuring circuits 15 of the measuring unit 10 from the heating circuit 6 and at the same time to disconnect the power circuits 9 of the power supply of the measuring unit 10. Then supply the switching unit 11 with the supply voltage of the network 12 to the heating circuit 6 film electric heater 3 thermoelectric mat.

The possibility of carrying out the claimed invention is confirmed by the use of known elements therein having optimal performance characteristics used in the construction field, with the achievement of a technical result consisting in increasing the electrical safety of a thermoelectric mat.

Claims (1)

A thermoelectric mat comprising an insulating sheath, inside of which there is a heat-insulating layer, a controlled thermal fuse, a film electric heater, characterized in that it further comprises an insulation resistance control device containing switching and measuring units, to the switching unit located outside the thermoelectric mat, connected in series with on the one hand, a measuring unit, on the other, through a controlled thermal fuse - heating a film electric heater tour, a measuring unit located between the heat-insulating layer and the film electric heater, which is a laminated resistive heating circuit and an aluminum foil radiator isolated from it, is connected by a signal circuit on one side to the signal element, and on the other measuring circuit through a switching unit at one end - with heating circuit, another with a radiator; the signal element of the device is located on the upper outer surface of the mat.

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