RU145996U1 - TAPE FILM WITH A POLYMERIC SENSOR SYSTEM FOR EARLY DIAGNOSTICS OF EMERGENCY SITUATIONS OF POWER-PRODUCING OBJECTS - Google Patents

Abstract

A rollable wide tape of type “adhesive tape” consisting of a polymer film made of partially dehydrochlorinated PVC plastic compound or another flexible polymer with a pronounced effect of temperature dependence of electrical conductivity, with electrical conductors applied to one of its surfaces parallel to the tape edges and a thin layer of non-drying adhesive composition, which serves when gluing it with two mutually perpendicular layers to create a system of conductors forming a coordinate {x, y} -grid in such a way that changes t The temperatures lead to local changes in the resistance of the polymer film and, in a simplified version, shorting the conductors of the {x, y} -grid, which, when connecting this system to the simplest computer system, allows you to directly monitor the surface temperature of the controlled room on the computer monitor, thereby preventing the occurrence of emergency situations and fires associated with abnormal heat generation.

Description

Utility Model Description

The utility model relates to techniques for monitoring the condition of industrial facilities, the operation of which is associated with the generation of heat, in particular, thermal, nuclear and hydroelectric power plants, as well as factory and other premises with increased fire hazard, the technical result of which is an operational warning about emergency situations, including early warning of fire hazard before smoke occurs and open fires. In a simplified scheme, the system can also be used in the definition mode "normal operation - emergency", for example, to issue alarms when the temperature exceeds a predetermined level at any point on the surface of the controlled object.

To this end, a coating is created on the walls, and, if necessary, also on the floor and ceiling of the room in which the controlled object is located, a thin polymer film whose working element is conductors that form a Cartesian grid of the two-dimensional coordinate system {x , y}, and the x-conductors are fixed on one side, and the y-conductors are fixed on the other side of the carrier thin polymer film playing the role of a sensor element. Any polymer film can be used as a carrier, for which the well-known from the scientific literature effect of a sharp decrease in the film resistance with increasing temperature, in particular, a transparent film of partially dehydrochlorinated polyvinyl chloride (PVC), can be used [1-3]. The ends of the conductors are connected using external wires to a computer, on the screen of which a similar {x, y} -grid is displayed on a reduced scale, and the corresponding temperature is plotted along the third coordinate z, which allows you to control the temperature distribution over the surfaces of the room. In another embodiment, dehydrochlorinated PVC is also used as the film material, but the degree of dehydrochlorination is selected as follows. that when a certain fixed temperature is reached, the film resistance almost instantly decreases by many (up to 10) orders of magnitude [1-3], thereby ensuring “shorting” of the grid at the corresponding point, which allows fixing points at which a predetermined temperature level is exceeded.

In the event of malfunctions of the controlled equipment causing increased heat generation, the temperature of the walls, floor and ceiling of the room in which the equipment is located also rises, and the corresponding changes are directly displayed on the monitor screen. The magnitude of such an increase indicates the occurrence of a malfunction, thereby performing remote monitoring of the state of the monitored object, making it also possible to judge by the magnitude of the temperature rise and the corresponding surface area the degree of danger of an emergency, and, in particular, prevent the occurrence of fires.

The proposed utility model is used to easily and quickly create the specified sensor system. For this purpose, it is proposed to use a roll-up wide (of the order of a meter or more) tape type “adhesive tape”, which is a thin-film base made of polymer, which can be used PVC plastic compounds using partial dehydrochlorination [1-3], or other film polymers for which the above physical effect is sufficiently pronounced. A non-drying adhesive is applied to the film surface, as well as a system of conductors parallel to the edges of the tape, after which the tape is rolled up.

To manufacture a sensor system, the walls in a guarded room with an existing coating (for example, in the form of wallpaper or painting) are first completely covered by gluing parallel strips of the specified tape, after which the surface of the resulting coating is covered again by gluing the same tape, but in the perpendicular direction. As a result, a two-layer system is formed, the lower polymer layer of which plays the role of a sensor element, and the upper one acts as a protective layer. After that, the ends of the conductors from one of the edges of each of the two tapes in accordance with the above are displayed on the computer.

As conductors in the system under consideration, ordinary thin metal conductors can be used, as well as any other similar highly conductive formations obtained, for example, using thin foil strips, spraying metal strips, using graphite conductive paint strips, or narrow and thin tapes made of highly conductive polymers .

In the absence of the need to obtain a complete picture of the temperature distribution over the wall surface, for example, when creating a fire hazard warning system long before the appearance of smoke or open fire, the considered construction can be simplified by preliminary gluing two identical tapes superimposed on each other. In this case, there is no need to use a computer, since gluing the resulting double tape as a floor covering using the simplest warning system, for example, an audio signal that is triggered when any two conductors from the upper and lower layers are shorted if the specified temperature is exceeded, solves the set task. In this case, the conductor system can be replaced by continuous conductive layers, for example, of thin metal foil or wire mesh.

The advantage of using the proposed wide tape type “adhesive tape” to create a sensor system is ease of installation and versatility, i.e. the suitability of use in rooms of arbitrary shape, which avoids the need for factory-made film sensor for each specific room.

Bibliography

1 D.V. Vlasov, V.I. Kryshtob, T.V. Vlasova, L.A. Apresyan, S.I. Rasmagin Investigation of the influence of temperature on the conductive properties of copolymer PVC - PolyAcetylene films arXiv: 1312.7101 [pdf]

2. D.V. Vlasov, L. A. Apresyan, Cascade Model of Conduction Instability and Giant Fluctuations in Polymer Materials and Nanocomposites. Advances in Materials Science and Applications, Jun. 2013, Vol. 2, Iss. 2, pp. 60-65.

3. Kryshtob V.I., Vlasov D.V., Mironov V.F., et al. Short circuit in electrical cables with polymer insulation. Electrical Engineering, t. 85, N 5 (2014).

Claims (1)

A rollable wide tape of type “adhesive tape” consisting of a polymer film made of partially dehydrochlorinated PVC plastic compound or another flexible polymer with a pronounced effect of temperature dependence of electrical conductivity, with electrical conductors applied to one of its surfaces parallel to the tape edges and a thin layer of non-drying adhesive composition, which serves when gluing it with two mutually perpendicular layers to create a system of conductors forming a coordinate {x, y} -grid in such a way that changes t The temperatures lead to local changes in the resistance of the polymer film and, in a simplified version, shorting the conductors of the {x, y} -grid, which, when connecting this system to the simplest computer system, allows you to directly monitor the surface temperature of the controlled room on the computer monitor, thereby preventing the occurrence of emergency situations and fires associated with abnormal heat generation.