Magnetic field indicator

Describe it:

The invention relates to the safety devices, in particular to the devices for identifying the unauthorized access to the devices for the record of the consumption of energy resources, such as electricity, gas, water, through the action with a magnetic field.

The methods and devices for establishing the unauthorized action on the recorders, namely on the meters after the physical destruction of the protective devices, are known.

The device for monitoring the operation of the water meter is known, which contains a sealing device composed of a small cylindrical ring and a large cylindrical ring. At the same time, the small ring comprises the head of the water meter, and the large ring comprises о part of the water meter and the upper parts of the tightening nuts. The large and small rings are joined together by means of a flat ring, forming a unique inseparable structure [1].

The device described is used to determine unauthorized access to the water meter nodes after the physical destruction of the sealing device.

But the given device is complicated from a constructive point of view, and its destruction in case of unauthorized access makes the process of control expensive.

It is also known that unauthorized action on household appliances for the consumption of energy resources can be carried out not only by destroying the protective devices, such as seals, but also by the non-destructive action on the internal elements of these devices, by for example, with a magnetic field that slows the rotational speed of the meter. This field can be created by powerful magnets, fixed to the body of the machine. In such cases, protection against unauthorized access can be performed with the help of a device for recording the use of a magnetic field.

The closest thing to the technical essence is the transducer for the recording of the ferromagnetic object, which confines a non-magnetic body and a magnetosensitive node located inside the body. The magnetosensitive node consists of a permanent ring magnet with a rectangular profile and a Hall element, and the body of the transducer is provided with a о grooved housing for fixing the Hall element. The presence of other components, especially of the printed plate, the sealing element, the ferromagnetic core, which are installed in the body housing and interact with the magnetosensitive node, form a rather complex construction for magnetic field recording [2]. '

The main disadvantage of the device described is the complexity, the consumption of a high volume of work for the manufacture and, consequently, significant financial expenses for the mass production for the use in the distribution structures of the electricity.

The problem solved by the invention is the creation of a simple and efficient constructive device for safe recording of the presence of the magnetic field, achievable on the basis of available and cheap materials.

The problem is solved by the fact that the magnetic field indicator confines a non-magnetic body and a magnetosensitive element, at the same time the body is composed of о transparent convex hollow portion and о lateral portion, which points from it to the perimeter, executed with the possibility of being sealed on the surface. external and the magnetosensitive element confines a viscous mixture of magnetic particles based on binding additives and is applied on the inner surface of the convex portion of the body in arbitrary form, being executed with the possibility of changing the shape under the action of the magnetic field.

Organic or synthetic additives, for example silicone, are used as binder additives, and the viscosity of the mixture is (27 ... 42) IO '² m²/ S.

A layer of adhesive material is applied to the side portion, from the top and / or bottom.

The convex portion of the body has an arbitrary geometric shape, for example a paraboloid sphere segment.

The body is made of polymeric materials, for example shock-resistant polystyrene, polyvinyl chloride plasticity.

The result consists in simplifying the construction of the magnetic field indicator, increasing the accuracy of detecting unauthorized action with magnetic field on the devices for recording the consumption of energy resources.

The claimed construction is simple in shape and convenient in use. Indeed, the shape of the body, which consists of two simple parts in making, one of which - side - is executed with the possibility of fixing on the surface conjugated with it, allows the indicator to be fixed on any surface, both flat and curved.

MD 393 Y 2011.06.30

As a result, the possibility of controlling the recorder is ensured, wherever the magnetic field source can be attached.

The use for making the magnetosensitive element of the viscous mixture of magnetic particles, such as a powder based on binder additives, determines the mandatory modification of the initial configuration of the element under the action of the magnetic field. At the same time, the configuration change according to the laws of the physics of magnetic phenomena takes place in the direction of the magnet's location.

Given the need to obtain the viscous mixture of the effect of modifying the configuration of the magnetosensitive element, the viscosity values ​​of the mixture used must be within the limits of 27x10² up to 42x10² m²/ S. The specified range of values ​​is determined by the fact that at values ​​less than 27x1 O '² m²/ s, the mixture becomes fluid, and at values ​​greater than 42x1 O '²m²/ s, the mixture becomes, in essence, a solid and getting its shape modified is practically very difficult.

Present to the transparent convex hollow portion, on the inner surface of which the magnetosensitive element is located, it allows it to freely change its configuration under the action of an external magnetic field and, therefore, to clearly demonstrate the unauthorized action.

The application of the adhesive substance on the lateral part of the body from the upper and / or lower part of it depending on the concrete method of applying the proposed indicator ensures the tightness of its fixation, and, consequently, the reliability of obtaining accurate results.

Moreover, on the one hand, the simplicity of the device's construction, on the other hand, the manufacturing of the indicator body from cheap polymeric materials widely available, make the process of making the claimed device less expensive, with less workload.

The invention is explained by means of the drawings in FIG. 1, 2, which represents:

FIG. 1, the top view of the magnetic field indicator;

FIG. 2, cross section AA of the indicator in fig. 1.

The magnetic field indicator (Figs. 1 and 2) includes a body 1, having a convex hollow portion 2, on the perimeter 3 of the base to which it affords a lateral portion 4. A magnetosensitive element 5 is applied to the inner surface of the portion 2 (fig. 2). , having the form arbitrated. in the execution proposed in FIG. 1 the element 5 is in the form of a segment of tips, because at least the convex portion 2 is made of transparent material, the magnetosensitive element is evident in its originated form.

The body 1 of the proposed device is executed according to the specific technological capabilities.

Based on binder additives, namely organic additives! or synthetics, such as silicone, are made of the magnetosensitive element 5 in the form of a viscous mixture, in the composition of which magnetic particles are included. The obtained element is applied on the inner surfaces of the portion 2.

The surface of the lateral portion 4 is covered with an adhesive compound, which ensures the tightness of the indicator fixation on any external surfaces.

The ready-to-use indicator is hermetically fixed to the controlled device instead of the possible installation of the magenta. The tightness of the fixing excludes access to the magnetosensitive element, because when trying to remove the indicator its integrity is violated, which obviously demonstrates the attempt of unauthorized access.

The installation of the magnet on a device with the indicator fixed leads to the fact that under the action of the magnetic field, the magnetosensitive element 5 changes its configuration, moving in the direction of the magnet. When the magnet is moved, the configuration of the element 5 continues to change, however when the magnet is removed the element retains its modified shape, which clearly demonstrates the fact of unauthorized action on the verified device.

It should be noted that the indicator of the proposed magnetic field can be used as a component of the sealing device, which in addition must contain a means equipped with numerical data, which identifies a concrete verified device. Combined in a single construction, the indicator and the means with the number form a reliable and cheap protection device against unauthorized action with magnetic field on the devices for the record of the consumption of energy resources.

An embodiment of the invention

In the process of experimental investigation of the proposed magnetic field indicator, several prototypes were used to detect the unauthorized action with magnetic field on the household gas meters.

The prototypes were made of the same shape, with о convex hemisphere shaped portion with a diameter of 10 mm, on the circumference of the hemisphere from its base deviated о lateral portion

MD 393 Y 2011.06.30 payment of an annular shape with a width of 3 mm. The body of the prototypes was executed by the vacuum forming process of polystyrene.

The magnetosensitive element was made based on the silicone lubricant Si-10 (TU 2389-32005763458-2001), with the addition of magnetic powder, corresponding to TU 6-36-05800165-1009-93. The mixture was prepared with a viscosity equal to 36x1 O '² m²/ s, which allowed the magnetosensitive element to be applied to the inner surface of the hemisphere as a round spot with a diameter of 3 mm.

For mounting the indicator on the tested object was used polyacrylate dispersion glue with long lasting action, which was applied on the lower surface of the annular portion.

The indicators obtained in this way were hermetically fixed to the body of the meters and subjected to the action of a magnetic field generated by a high power magnet. At the same time, the magnets were placed on different counters from different parts to the indicator.

In response to the applied magnetic field, the stain reacts properly, changing its configuration and moving in the direction of the magnet's location. If the magnet was placed above the indicator, the stain would stretch, obtaining an irregular shape.

In the case of multiple experiments, the reaction of the indicator was 100% for the presence of a magnetic field.

The experiments were carried out at different temperatures, demonstrating the usefulness of the indicator in conditions of changing temperatures from -40 to + 60 ° C.

Thus, the experiments carried out showed that the use of the indicator described in the construction of a sealing device can provide the counter о safe protection, recording once action on it with a strong magnetic field.