Magnetic field indicator

The invention refers! to the safety devices, especially to the devices to identify the unauthorized access to the devices of records of the consumption of resources, such as electricity, gas, water, by the action with a magnetic field.

There are known methods and devices for establishing the unauthorized action on the devices for the record of the consumption of energy resources, especially on the meters of water, gas and electricity of domestic use, which implies the non-destructive action on the internal elements of these devices, for example, with the help of a magnetic field that blocks the speed of rotation of the calculation mechanism (counter). This field is created by powerful magnets that attach to the body of the machine. In such situations, protection against unauthorized access can be performed using a device to record the use of a magnetic field.

The ferromagnetic object recording transducer is known, 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 in the body of the transducer is made a groove for fixing the Hall element area. Other components, in particular the printed plate, the sealing element, the ferromagnetic core, installed in the body housing, at the interaction with the magnetosensitive node, form a rather complex structure for recording the magnetic field [1].

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

The closest to the technical essence! of the magnetic field indicator claimed is the device consisting of a non-magnetic body with о transparent portion, executed with the possibility of hermetic fixation on the outer surface, and a magnetosensitive element, which confines a viscous mixture of magnetic particles based on binding additives, deposited on the surface inside of the body in shape! arbitrary and executed with the possibility of changing its shape under the action of a magnetic field [2].

In the aforementioned indicator the body is made up of о transparent convex hollow part and о lateral part, which points from it on the perimeter of the base, executed! with the possibility of sealing tightly on the outer surface conjugated with it.

The main disadvantage of the construction described is the open access to the magnetosensitive element, which makes it vulnerable to various unforeseen effects that could affect its physical and technical properties and, therefore, reduce the reliability of the indicator.

The problem you solve! The invention consists in the creation of a simple, reliable and efficient constructive device, convenient in manufacture and operation and achievable on the basis of accessible and cheap materials.

The problem is solved by c! the magnetic field indicator includes a non-magnetic body with о transparent portion !, executed with the possibility of hermetic fixation on о surface! exterior, and a magnetosensitive element that confines a viscous mixture of magnetic particles on the base! of binder additives, applied on the inner surface! of the body in shape! arbitrary and executed with the possibility of changing the shape under the action of a magnetic field, At the same time! the body is made up of at least two! porches, executed and sealed together with the possibility of forming a closed space between them at the same time! at least one of the portions is executed! transparent !, and at least a portion of the body is executed flat.

As binder additives it is used! organic or synthetic additives, for example silicone, and the viscosity of the mixture is (27 ... 42) x 10 '² m2 / s.

Sealing the portions of the body tightly and fixing it to the outer surface is done! by applying a layer of adhesive material on the conjugated surfaces.

The body is made of polymeric materials, for example shock-resistant polystyrene, polyvinyl chloride plastics or other similar materials.

The result of the invention is const! in increasing the reliability of the magnetic field indicator construction and its fixation on the recorders, which increases the degree of protection of energy resources against thefts.

Execution of the body of the hermetically sealed indicator and the placement of the magnetosensitive element inside the body, again! direct access to it increases reliability

MD 535 Z 2013.04.30 of the device as a whole, because it protects the magnetosensitive element against accidental mechanical actions during the storage, transport and installation on the devices of the energy resources that could affect its integrity and properties.

At the same time, the closed hollow construction allows the execution of one of the flat body portions, and the other of the shape of an arbitrary convex geometric figure, such as a sphere segment, paraboloid or other surface. As a result, the magnetosensitive element is able to change its configuration under the action of an external magnetic field and, therefore, to clearly demonstrate the unauthorized action.

In addition, the possibility of placing the magnetosensitive element at any point on the inner surface of the body and executing a flat portion simplifies the process of making the indicator, since applying the magnetosensitive element on the flat surface is technologically simpler and more convenient.

The proposed construction provides for the execution of transparent material of the whole body or of one of its portions, but in order to ensure the visual control of the magnetosensitive element.

The use for making the magnetosensitive element of the viscous mixture of magnetic particles, such as a powder based on binder additives, causes the inevitable change of the initiated 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.

Considering the necessity to obtain the viscous mixture of the effect of changing the configuration of the magnetosensitive element, the viscosity values ​​for the mixture used must be within the limits of 27 x IO '.² up to 42 x IO '² m²/ S. The specified range of values ​​is determined by the fact that at values ​​less than 27 x IO '²m2 / s the mixture becomes fluid, and at values ​​greater than 42 x IO '² m²/ s the mixture becomes essentially a solid and getting its shape modified is practically very difficult.

Execution of the body of the closed indicator simplifies the process of fixing it on various devices, regardless of the configuration of their surface, by applying the adhesive material on the corresponding part of the body so as to ensure the possibility to carry out the control anywhere of the verifiable record device, where it can the magnetic field source must be fixed.

Moreover, on the one hand, the simplicity of the device's construction, and on the other hand, the manufacturing of the indicator body from polymeric materials is widely available, to which any form can be assigned technologically, make the process of making the claimed device less costly both in terms of labor and material resources, as well as financial resources.

The essence of the claimed technical solution is explained by 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, in the execution shown in fig. 1 and 2, it confines a body 1, having о convex hollow portion 2, on the perimeter 3 of the base to which it affords о lateral portion 4. The magnetosensitive element 5, having the shape of a defective configuration stain, is applied on the inner surface of the portion 6, executed flat. (Fig. 2). Sealing the convex portion 2 to the flat portion 6 with the side portion 4 creates a closed cavity space inside the body 1, in which the magnetosensitive element 5 is located.

In the proposed embodiment, the magnetosensitive element 5 is in the form of a sphere segment. Because at least the convex portion 2 is made of transparent material, the magnetosensitive element is evident in its originated form.

In the process of making the proposed device, its body 1 is preferably composed of two hermetically joined portions, however it can be made of another form, depending on the needs and the concrete technological possibilities. Based on a binder additive, organic or synthetic, such as silicone, the magnetosensitive element 5 is prepared as a viscous mixture, which confines magnetic nanoparticles. The obtained element is applied to the inner surface of the body.

The outer surface of the flat portion 6 is covered with an adhesive composition which ensures the tightness of the indicator fixation on any external surface of the meter.

MD 535 Z 2013.04.30

When using, the indicator is hermetically fixed to the controlled device instead of the possible installation of the magnet. The tightness of the body excludes unauthorized access to the magnetosensitive element.

The installation of the magnet in case the indicator is fixed on the device leads to the fact that under the action of the magnetic field the magnetosensitive element 5 changes its configuration, transforming in the direction of the magnet. When the magnet moves, the configuration of the magnetosensitive element 5 continues to change, at the same time when the magnet is removed, the element retains its modified shape, which clearly demonstrates the unauthorized action on the verified device.

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

Example of concrete embodiment

During the experimental research of the proposed magnetic field indicator, several prototypes were made and used to detect the unauthorized action with magnetic field on the gas meters for household use.

The prototypes were made of the same shape, with о hemisphere-shaped convex portion of 10 mm diameter with о flat side portion of annular shape 3 mm wide, pivoting from its base, and о flat portion of square shape on the side 16 mm face. The convex portion of the body was executed by vacuum polystyrene process, and the flat square portion was cut using a standard PVH stamping device with a thickness of 0.5 mm.

The magnetosensitive element was made based on the silicone lubricant Si-10 (TU 2389-320-05763458-2001) with the addition of corresponding magnetic powder TU 6-3605800165-1009-93. The mixture was prepared with a viscosity equal to 36x1 O '²m2 / s, which allowed the magnetosensitive element to be applied to the surface of the flat portion in a round shape with a diameter of 3 mm.

For the combination of the convex and square portions, as well as for fixing the indicator on the tested object, a long-acting polyacrylic dispersion glue was used, which was applied on the lower surface of the annular portion and the outer surface of the square 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 magnetosensitive element reacted properly, changing its configuration and turning in the direction of the magnet's location. In case the magnet was located above the indicator, the magnetosensitive element was stretched, obtaining an irregular shape.

In the process of multiple experiments, the indicator reacted 100% to the presence of the magnetic field.

The experiments were carried out in a climatic room at different temperature regimes, demonstrating the possibility of the indicator to operate under conditions of changing temperatures from -40 to + 60 ° C.

Thus, the experiments carried out showed that the use of the indicator according to the invention in the construction of a sealing device can offer the meter a safe protection, recording any action on it with a strong magnetic field.

MD 535 Z 2013.04.30 (56) References cited in the description:

1. UK 2002123676 A 2004.06.10

2. MD 393 Y 2011.06.30 (57) Claims: