SU598152A1 - Sealed magnetically-operated contact relay - Google Patents

Description

one

The present invention relates to the field of low-voltage apparatus and can be used in devices using magnetically controlled sealed contacts.

Known relays with a high return ratio (not more than 0.7), as the reed switch MKV-1. Such relays include voltage relays of the RNG series on reed switches MKV-1, 2j. But these reed switches due to the complexity of the magnetic system. The paths of conventional symmetrical reed switches of KZM-1, KZM-2 types are significantly, and most importantly, they are inferior to their switching capacity. The recharge power of the reed switch is 30 W, while the switching power of the YKV reed switch; -7.5 W, which limits the scope of application of such relays J.

Symmetric reed switches of type CEM-1 and CEM-2 t; cannot be directly used in protection and control equipment (current relays, voltages, etc.) requiring a normalized return ratio due to variation in return ratio from 0 3 to 0.9. If “they were applied in protection equipment and

then, with a mandatory selection by return rate of 4.

It is also known to have a relay on a magnetic circuit with a sealed contact placed in the control coil, containing a permanent ring-shaped magnet whose field is directed opposite to the field of the control coil, and a ferromagnetic covering the sealed contact 15 J,

However, this relay does not have a high return ratio.

With the aim of increasing the return coefficient, a permanent ring-shaped magnet is mounted close without a gap to the end face of the control coil AND; ferromagnetic tube. The ferromagnetic tube is filled with a pressurized soft material, for its sake is about the length of the coil;

Claims (5)

The drawing shows the design of an writeable relay. The relay contains a reed switch 1, a permanent magnet 2, a ferromagnetic tube 3 and a coil 4 As is well known, the return coefficient of the relay is determined by the ratio f vj l. The presence of a permanent magnet, the field of which is directed opposite to the carriage, slightly increases. relay, but at the same time when the coil is disconnected, i.e. when the coil flow decreases, the moment comes when the magnetizing force of the coil becomes equal to the opposing magnetizing force of the permanent magnet AW and the drop of the reed switch occurs at elevated amperes of the coil, which leads to a sharp increase in the return coefficient. This is confirmed by the following relationship AWonm. + AWn.H. . + AWfi.M. From this ratio, it can be seen that the greater the magnetizing force of the permanent magnet, the greater the return coefficient of the relay, but an excessive increase in the magnetizing force of the permanent magnet. leads to the closure of the reed switch, h, so the permanent magnet is chosen so that its energy is not enough to trigger the reed switch. In order to increase the efficiency of the permanent magnet, the use of two permanent magnets and a ferromagnetic tube, the ends of which are adjacent to the ends of the permanent mannets, is proposed. The presence of a ferromagnetic tube leads to the shunting of the flux of magnets and coil when triggered, which slightly increases the relay, however, with OTKjno4eHHH. coil magnification, significantly larger than the increase in AW CRO, as well. ; In addition, the distinguishing feature of the proposed relay is to make a ferromagneted tube of a magnetically soft material, and making it of a magnetically hard material would lead to sticking of the reed. The control is carried out by changing the magnitude of the current, and not by changing the direction. In contrast to the relay, in which the ferromagnetic tube is made of a magnet material and has a length greater than or equal to the reed switch, in the proposed relay it is equal to the length of the coil. Taking into account that in practice the aim of reducing the power consumption of the relay, the control coils are shorter than the length of the reed switch, the proposed solution allows to increase the coefficient (: return of the relay. Thus, the proposed ferromagnetic tube together with the remaining ring-shaped magnet At its end and at the end of the coil, it has a new positive effect, and it allows to increase the relay return coefficient with reduced dimensions, power consumption and simplified design. At the same time, the effect is achieved without an increase in energy and dimensions of a magnet, and due to its position. As shown by tests, an increase in abarits and energy of one magnet re allows a return coefficient of more than 0.65, while due to the use of an additional CONSTANT magnet, the return coefficient increases to 0.8. Such an effect is explained by different distribution of magnetic fields. Formula of the invention A relay on a magnetically controlled sealed contact placed in a control coil containing a permanent ring-shaped magnet whose field is The coil of the control coil is oppositely directed, and a ferromagnetic tube enclosing a sealed contact, characterized in that, in order to increase the return coefficient, a permanent ring-shaped magnet is mounted close without a gap to the end of the control coil and the ferrosmagitic tube, the ferromagnetic tube is made of a magnet of a soft material , its length is equal to the length of the control stick, and an opposite square permanent magnet is placed next to the opposite end of the control roll; claimed counter field control coil. SOURCE of information taken into account by experts: 1. Abramov N. I; R. Control relays G on KokHT Instruments and Systems. control, W 5, 1Г72 g 2. Abrams. N. et al. Investigation of the characteristics of control relays on reed switches, Instruments and control systems, No. 2, 1975 3. Reed CEM-1 and CEM-2. 4. Polkov GP. On the speed of the AC relay and magnetically controlled contacts, Instruments and control systems, And, 1971. 5. US Patent 2877315, cl. 335153, 1969