SU532910A1 - Electromagnetic relay - Google Patents

Description

The invention relates to switchboard automation devices on magnetically controlled conductors used in current and voltage monitoring systems. Such devices are often subject to high return rates.

In the known switching devices on magneto-corrected contacts 1, the return coefficient of the most common symmetrical closing contacts of the type KEM-1 varies from 0.3 to 0.9. Therefore, in the manufacture of a control relay, it is necessary to make a special selection of magnetically controlled contacts for the required return coefficient.

The closest in technical essence to the present invention is a relay in which a ferromagnetic is applied, mounted on the reed switch 2 balloon. This tube is intended to change the magnetizing force of the relay to operate and is much shorter than the total contact length.

The return volume of a relay makes production much more difficult, since their number throughout the batch of contacts to be tested is usually small.

The purpose of the invention is to increase the return coefficient of the relay.

This is achieved by the fact that, in the proposed relay, the ferromagnetic tube is equal to or longer than the magnetically controlled contact and has a saturating section formed, for example, by changing the cross-sectional area and located opposite the working gap of the magnetic-contacting contact, but less than twice its diameter.

In order to ensure the effectiveness of the use of a ferromagnetic tube from the ends, it is closed by a ferromagnetic pinch.

The thickening portion can be formed by a combination of three ferromagnetic tubes, one of which, forming the saturation portion, is located in the zone of the working gap of the reed switch, and the other two are adjacent to it from two sides, forming a portion with a lower magnetic resistance.

The bottom of the tube forming the saturation region is a material with a rectangular hysteresis loop.

Fig, 1 shows the proposed relay, a general view; in fig. 2 — magnetically controlled contact and ferromagnetic tube with caps; in fig. 3 asymmetric magnetically controlled contact with a ferromagnetic tube; in fig. 4 — magnetically controlled contact with a combined ferromagnetic tube consisting of three tubes; on fi1. 5 shows the circuit for replacing the magnetic circuit of the relay. magnetic contact; in fig. 6 is a circuit for replacing a magnetic circuit with a magnetically controlled contact and a tube attached to the balloon.

In the drawings, the following designations are accepted: 1 — control coil, 2 — magnetically controlled contact, 3 — working gap, 4 and 5 — contact cores, 6 — ferromagnetic tube, 7 — axial section, 8 and 9 — ferromagnetic covers, 10 damping sleeve , p is the magnetizing force of the coil, R is the magnetic resistance of the air gap, R "is the magnetic resistance of the contact plate, R is the map resistance of the external part of the relay circuit, through which the magnetic flux of the coil closes, R is the magnetic resistance of the end section of the tube, ma Gnitnoe resistance is not pressing at the end of the tube.

The magnetic flux of the relay-free coil of the relay (see Fig. 5) closes along a circuit that includes a series of connected magnetic resistances of the contact plates 2Rp, the air gap R and the outer section of the circuit B. As the current in the control coil 1 increases, the magnetizing force of the coil increases and the magnetic flux Φ in the indicated circuit increases. When the magnetizing force F of the coil 1 reaches the magnitude of the magnetizing force of the operation of the magnetically controlled contact without the ferromagnetic tube 1 Wj.p, the relay operates and the contact plates close. If we denote the magnetizing release force W, the return coefficient of a relay without a ferromagnetic tube is equal to the return coefficient of a magnetically controlled contact (reed switch)

.R. .g.

The effect of using the ferromagnetic tube 6 with the saturating portion 7 is as follows. With a slow increase in the current in the control coil 1, practically the entire magnetic flux F passes through the ferromagnetic tube 6, i.e. on branch R., R, R, (see Fig. 6), mine working gap 3 magnetic contact. The flux F through the reed switch will be insignificant due to the large magnetic resistance B g of the working air gap present in this branch. When the magnetizing force F of the catupzhi 1 reaches a certain total width, 1 W occurs more saturated than region 7, which is equivalent to a sharp increase in the magnetic

resistance R of this area. The difference in magnetic potentials between the ends of the ferromagnetic tube 6 becomes significant.

iAv) “F ()

Up to section 7, the magnetic resistance of the tube 2R - f is small and the drop of the magnetic potential is also very small.

The magnetic resistances of the tube T, 1 after our evaluation become comparable and the total magnetic flux F is now redistributed along the indicated branches depending on the magnitude of these resistances:

F g f

/ ()

A6

(

)

P

As soon as the magnetic flux F flowing through the reed switch reaches the flow

reed contact plates are closed.

T.S.

OW, / (,

city with

It should be noted that the flow .c will be the same for the relay with and without ferromagnetic tube. Only for a relay with a ferromagnetic tube, the total flow must reach a higher value than for a relay without a tube (see Fig. 5 and 6) in order for the flow through the reed switch to reach the Fabatani flux flow. This is possible only with an increase in the magnetizing force of the coil .

The return coefficient of a relay with a ferromagnetic tube in the first approximation is defined as

four.(

The moment of the assessment of section 7 varies depending on the hermetic dimensions of the section and the induction of saturation of the material used. Let us introduce a coefficient equal to the ratio of the ampere turns 3Wj to the amper turns of the reed switch 3W

 : 3W / 3W

OS

Then the expression for the return coefficient of the relay with a ferromagnetic tube is:

V.r (K5.r - “- o1) / (- (+ OL)

From the above expressions it is clear that the return coefficient of the relay K j ,, is higher, the greater the value exceeds the value 3W ,. o hercotact 2 and the length must be equal to it or more. The ferromagnetic covers 8 and 9 can be ;: executed in the form of cups, put on the KOiuibi tube 6. In this case, either holes should be provided in the covers or in the tube for conducting electrical wires to the leads. The damping sleeve 10 serves to prevent the glass cylinder contacting 2 from colliding with the inner surface of the tube 6. The magnetically controlled contact 2 and the sleeve 10 are fixed from longitudinal movements in the ferromagnetic tube 6 using glue, special stops, restrictive sleeves that prevent the working gap 3 from shifting relative to the transverse the plane of symmetry of the saturating section 7. The saturating section can be performed by grooving on a lathe, local drawing of a ferromagnetic tube, or milling, other windows. The length of the section, on the one hand, is limited by the desire to reduce the shunting effect of this area after saturation on the working gap 3, and on the other hand, the maximum magnetic conductivity between the ends of the ferromagnetic tube 6 and the contact cores 4 and 5 is obtained. The length of the saturable section 7 is more rational than the radius of the ferromagnetic tube 6, but less than twice its diameter. The saturating portion 7 of the ferromagnetic tube 6 is located symmetrically with respect to the working gap 3 and completely covers it. When using symmetrical magnetic contacts, section 7 occupies the central part of tube 6 (Fig. 2), with asymmetric magnetic contacts, the saturable section 7 is shifted (Figure 3).

The saturation section 7 can also be formed by a combination of three ferromagnetic tubes (Fig. 4), one of which, forming an all-inclusive section, is located in the working gap of the reed switch, and the other two are adjacent to it with two torons, forming an area with less resistance.

Claims (2)

1. Electromagnetic relay containing a magnetically controlled contact, a ferromagnetic tube worn on the cylinder of the magnetically controlled contact, and a control coil circling them, characterized in that, in order to increase the return coefficient of the relay, said ferromagnetic tube is equal to or greater than the length of the magnetically controlled contact and has a saturable region located opposite the working gap of the magnetically controlled contact, the saturation region being longer than the radius of the ferromagnetic tube but less than its doubled length and the diameter. 2. A relay according to claim 1, characterized in that said ferromagnetic tube is made up of three separate parts, the middle of which forms a saturable region. Sources of information taken into account in the examination: 1. Ya. M. Dikovsky and I. I. Kapralov Magneto contacts. M., Energie, 1970. 2. US patent number 3174008 CL. 200-87, 16.03.64 (prototype). 6 h / I Z 5 I / W yXiL ooh Z 5 FIG. 6