DE1234317B - Sensitive relay - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY Int. Cl .: HOlh

GERMAN WHtWl PATENT OFFICE

EDITORIAL

German class: 21g-4/01

Number: 1234 317

File number: C 26902 VIII c / 21 g

J 234 3 IT filing date: May 4, 1962

Opened on: February 16, 1967

The invention relates to a sensitive sensitive relay
Relay, which is used in particular to operate
Power off switches when fault currents occur
is determined and its movable anchor the shape
a disk, which preferably consists of a magnetic 5 Applicant:

table material consists of high initial permeability. Compagnie de Construction Electrique ₃

It is already known that in electromagnetic Re- _{r 7} ,,,. ". _{/ T,,} . , ■>

Iais small air gap between the moving An Issy-les-Mouhneaux, Seme (France)

ker and the fixed pole pieces to become representatives:

prevent the anchor after the interruption io. _T ^ _t,. ^ _x ^ _TT

of the current through the action of the coercive force DipL-Ihg. E. Pnnz, Dr. rer. nat. G. Houses

of the magnetic material, which according to the Abschal- ^and DipL-Ing. G. Leiser, patent attorneys,

ten of the current is stuck. The previously Munich-Pasing, Ernsbergerstr. 19th
columns used are of the order of magnitude of

about 100 μ, and these gaps are characterized ER- 15 ^ y _s inventor benanntzeugt that rivets of a non-magnetic ma- _{Maurice Chirol paris}

tenal between the movable armature and the;

fixed pole pieces can be installed. This gap ...

but can also be caused by an electrolytic low-stressed priority:

impact method are produced in which a 20 France dated February 5, 1962 (886 933),

very thin layer of a non-magnetic metal dated February 21, 1962 (888 690)

is applied to the fixed pole pieces. At a

Air ~ generated by means of a precipitation process
However, the harmful and

disadvantageous adhesive effects between the pole parts 25 is permissible, since they largely switched off the sensitivity. This changes the functional stability of the relay. A Redes Relay is already extremely weakened. It is well known in which the middle core is equipped with a nylon sleeve when the gap between the fixed pole is fitted. This nylon sleeve pieces and wants to produce the movable armature by means of a generated by its arrangement between a rivet, this rivet must be made of a 3 ° movable armature and the non-magnetic material together with the armature a very small pole penetrating an air gap. This nylon sleeve has knives, and since this rivet has the mechanical purpose of reducing the noise and is exposed to shock loads, it is extremely difficult, on the other hand, to prevent the anchor from getting stuck to prevent the height of the rivet from being affected by the coercive force of the pole pieces to keep constant in the order of 100 μ. 35 could be effected. Known relays of this type It has also been used to set the release time but develop mechanical forces that are in the order of magnitude of a very small adjustable air gap of at least several 100 g, with a tolerance in the For this reason, the separation takes place of the order of magnitude of 10 μ, whereby this gap was formed by borrowed armature from the core in the event of a current pulse, an eccentric disk, which was attached to 40 without difficulty. With such an arrangement one of the pole pieces of the relay was fixed, and voltage, however, in no way solved the problems with the edge of this disc becoming a displacement that occurs in sensitive relays, which caused a non-magnetic cross-piece to a mechanical force of the order of magnitude of which one end of the movable anchor off - develop only a few grams. Supported in such. Such a device is exceptionally sensitive relay 45 to the separation of the movable-consuming and has a not enough overall loan armature from the core, by the total Entnauigkeit on. Such devices cannot be used with magnetization or partial demagnetization of very sensitive electromagnetic relays with the magnetic circuit of the relay, a constant air gap. under the influence of extremely weak In particular, such facilities cannot be carried out by 50 forces.

are used in polarized relays, in which, according to the invention, therefore, the movable Angine carries Tolerance on the order of 10 μ not ker a collar, made of non-magnetizable material,

Claims (1)

which forms a very small air gap of less than 100 μ with the surface of the fixed pole pieces of the magnetic circuit and is provided with incisions, through which the contact area between the collar and the pole pieces is reduced and which allow air to be exchanged at the gap. With a suitable design of the collar, the contact surface of the same with the fixed pole pieces is as small as possible, and in addition, all ventilation difficulties are eliminated. It can also happen that the armature and the pole pieces get stuck together because, when weak current impulses are supplied, the air flowing in is so small that the air pressure effective from outside compresses the two pole pieces. This ventilation problem is solved at the same time by the invention. Advantageously, the fixed electromagnetic circuit can have the shape of a U and the pole pieces of this circle can be opposed to one another at a distance which is smaller than the outer diameter of the collar. In the figures of the drawing, exemplary embodiments of the invention are shown schematically. It shows as Fig. 1 is a side view of a sensitive relay constructed in accordance with the invention, FIG. 2 shows a plan view of the anchor carrying a collar and. 3 shows a further embodiment of the subject matter of the invention. In Fig. 1, a fixed magnetic circuit is shown, which is constructed in a U-shape. A demagnetizing winding 2 is applied to one leg of this fixed magnetic circuit. A permanent magnet 3 is used to polarize the magnetic circuit 1. With 4 and 5 .-. denote two magnetic pole pieces which are attached to the two legs of the magnetic circuit 1 in order to move the magnetic lines inwards, i.e. H. towards the anchor to redirect. The armature 6 is disk-shaped and is pressed onto the ends of the pole pieces 4 and 5 by the axis 8 directly or with the interposition of a spring. A spring 9 is arranged on the axle 8 and is compressed between the magnetic circuit 1 and a collar 10 of the axle 8. The movable armature 6 is attracted to the pole masses 4 and 5 by the permanent magnet 3 in the direction of the arrow F1. When a demagnetizing current flows through the winding 2, the spring 9 can push the armature away from the pole pieces and the corresponding movement of the axis 8 can be used for switching purposes. A collar 7 made of a non-magnetic material is arranged around the armature disk 6. The height of this collar is chosen such that a measurable gap which can be reproduced in production remains between the disk 6 and the pole pieces 4 and 5. The gap can, for example, be on the order of a few microns. The thickness of the collar 7 should be as small as possible in order to reduce the extent of the non-magnetic area which comes into contact with the pole pieces 4 and 5. The collar 7 can have a diameter of 5 mm, while the distance between the pole pieces 4 and 5 is of the order of 2 mm. The diameter of the axis 8 made of a non-magnetic material can be 1 mm. The size of the gap that remains through the collar 7 between the disc 6 and the fixed pole pieces 4 and 5 can be between 5 and 30 μ, depending on the sensitivity of the relay. The contact area between the collar and the pole pieces 4 and 5 can be very small, for example on the order of 0.5 mm 2. The armature disk 6 can also sit loosely on the axle 8, a ring 13 being provided on the axle. 14 with a sleeve made of a non-magnetic material is referred to, which leaves sufficient play free relative to the ring 13 so that the disc-shaped armature 6 is free when it is of the pole pieces 4 and 5 at. Shifting the axis 8 in the direction of the arrow Fl is attracted. The sleeve 14 loaded with the spring 9 presses against the armature 6 when the axis 8 moves in the direction of the arrow F2. The collar 7 made of a non-magnetic material may be provided with incisions or teeth on its outer peripheral surface. As a result, on the one hand the size of the surfaces with which the collar 7 and the pole pieces 4 and 5 bear against one another is reduced and, on the other hand, an air flow around the contact surfaces is made possible. The incisions can be made by means of devices known per se and, for example, have the shape of small teeth, pyramids, etc., which expediently rest against the pole pieces with their tapered sections. Fig. 2 shows a plan view of the armature 6 and the collar 7, and it can be seen that the collar 7 has tooth-shaped incisions on the upper edge. In the embodiment shown in FIG. 3, the non-magnetic sleeve 14 is replaced by a magnetic sleeve 15, and the lower part of the axle 8 is guided on an adjustable bearing 16. The purpose of adjusting this bearing is to adjust the play of the sleeve 15 in the gap between the pole pieces 4 and 5. Under the action of the permanent magnetic field, the sleeve 15 is attracted towards the pole mass, which opposite it has the smallest gap. If, however, a demagnetizing force field is generated in the pole masses in the event of a fault, a variable alternating force acts on the sleeve 15, which leads to a slight vibration of the sleeve and consequently to a slight vibration of the axis 8 and the armature 6 when the Axis has a certain elasticity, due to the fact that, for example, a spring presses on the axis 8. The vibrations caused in this way can weaken or even cancel out the non-magnetic adhesive forces between the armature and the pole pieces. Patent claims: 1. Sensitive relay, which is intended in particular to operate current switches when fault currents occur and whose movable armature has the shape of a disk, which preferably consists of a magnetic material of high initial permeability, characterized in that the movable armature (6) has a collar ( 7) made of non-magnetizable material, which forms a very small air gap of less than 100 μ with the surface of the fixed pole pieces (4, 5) of the magnetic circuit and which is provided with incisions