DE8535821U1 - Magnetic switch - Google Patents

Description

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Nuremberg, December 16, 1985 Heg. 28828

MAGNETIC SWITCH

Descriptionί

The innovation relates to a magnetic switch according to the preamble of claim 1.

Such magnetic switches are basically already known.

From DE-PS 94-1 801 is a magnetically actuatable Known vacuum switch, which in a closed insulating housing at least one movable, magnetically influenceable Has switching element. An electrical contact is arranged on a resilient tongue. There the moving contact corresponds to the movements of a permanent magnet arranged outside the closed insulating housing follows, the contacts can be closed by moving this permanent magnet accordingly provided that either the contacts or the contact spring can be influenced magnetically. Is disadvantageous with this switch that at least some material is required which is both electrical and magnetic is conductive. Such a material has relatively high electrical resistance values. In addition, is the resulting contact pressure between the electrical contacts depends on the magnetic effect and therefore not exactly definable because there are any

Disturbances within the magnetic circuit inevitably also lead to a change in the contact pressure.

The same also applies to the switching device according to GH-PS 565 445, in which also by corresponding When a magnet approaches, the electrical contacts are closed.

From DE-OS 1 801 940 is a magnetically actuatable Known protective tube armature contact, two rigid contact arms of different lengths melted into the protective tube on one side are whose longer contact arm carries an armature made of a comparatively thin, resilient Contact tongue exists. When a suitable magnetic field is applied, the resilient contact tongue becomes shorter Contact arm attracted and thus bridged an air gap. The resilient contact tongue must also be used for this arrangement be both magnetically and electrically conductive. The resulting disadvantages have already been mentioned above mentioned. The contacts are closed under the action of the magnetic field. Any errors within of the magnetic circuit result in changes in the contact pressure.

DE-AS 1 143 565 discloses a protective gas magnetic switch known, in which a force on a Veicheisenstück by a magnet located outside the encapsulated housing is exercised, which is connected to a spring-loaded contact tongue. By deflecting the Veicheisenstücks is also the associated contact tongue against its own spring action with its contact

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deflected in the direction of a second contact. at This known arrangement can make the contact tongues from an electrically conductive, but not magnetic conductive material. The magnetic effect is only due to the piece of soft iron on the Transfer contact tongue. However, this known magnetic switch is used for a one-time and only brief contact. The contact is then opened again immediately. Again, the contact pressure is from the magnetic forces addicted. Disturbances in the magnetic circuit therefore lead to changes in the contact pressure here too.

The object of the innovation is to create a hermetically sealed magnetic switch in which the contact pressure can be precisely defined.

According to the new feature, this task is marked = nenden features of claim 1 solved.

Advantageous further developments result from the claims.

The innovation is explained below with reference to the drawing figures, for example. Show it:

1 shows a magnetic switch with a non-magnetizable contact tongue, a permanent magnet connected to the contact tongue or one with the contact tongue

connected, magnetically conductive material and an associated magnetically permeable

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in a hermetically sealed housing.

Fig * 2 shows a magnetic switch according to Fig. Ί, "in which the magnetic circuit is completed in the housing wall

digendes, magnetically conductive metal part is arranged,

FIG. 5 shows a magnetic switch according to FIG. 1

or Fig. 2, in which the magnet

1 "Ö not directly on the contact tongue,

but arranged on a switch plunger connected to the contact tongue is,

4 shows a magnetic switch with a plurality of partial contact tongues in an explosion

depiction.

In Fig. 1, a magnetic switch 10 is shown, which is arranged in a hermetically sealed housing 11, from which only contact connections 12 and 13 emerge. The contact terminal 12 is connected to a first Kon-HO clock 14 connected inside the housing 11, which is fixedly arranged on a contact carrier 15, which is in turn firmly connected to the housing 11. Located at a short distance from the fixed contact 14 a movable contact 16, which is arranged on a resiliently deformable contact tongue 17. Contact 16 and contact tongue 17 are made of electrically conductive, but magnetically non-conductive material. On the opposite side of the contact from the second contact 16 17 is a JJauermagnet 18 or one made of magnetically conductive Material existing part arranged. At the neighboring

A magnetic opening 19 is provided in place of the housing 11 and the hermetic encapsulation is maintained the housing 11 is magnetically permeable, so that the effect of a magnet brought in from the outside 20 or a magnetically conductive part influence the position of the contact tongue 17 and thus of the contact 16 can. Under the action of the magnetic forces of a permanent magnet or an electromagnet, the Contacts 14 and 16 are separated from one another and thus the flow of electrical current is interrupted. At rest on the other hand, due to the spring action of the contact tongue 17, a precisely definable contact pressure is guaranteed = Even if the contact tongue 17 breaks, a corresponding Positioning of the magnet 20 ensures a contact opening. By extending the effective Lever arm of the magnet 18 on the contact tongue 17 below Maintaining the lever arm of the contacts 14, 16 can Sensitivity to be dosed.

Fig. 2 shows a variant of the magnetic switch according to Fig. 1. To improve the magnetic circuit (bundling the lines of flux) a magnetic circuit was used here conductive metal part 21 let into the wall of the housing 11.

In many cases it is desirable or also structurally necessary to move the magnet 18 spatially away from the contact tongue 17 to separate. For this purpose, a switch plunger 22 between the contact tongue 17 and the Magnet 18 arranged. In addition, what has been set out further applies to this embodiment as well.

A variant is shown in FIG. The contact tongue 17 there consists of 3 parallel dividing tongues 17a to 17c with contacts 16a, 16b and 16c. The contact tongue 17 consists of electrical, but not magnetically conductive material. At certain predetermined points the dividing tongues 17a to 17c are magnetic conductive metal parts 18a, 18b and 18c arranged. Because of the different arrangement of these metal parts 18a to 18c in relation to the base line 23 of the contact tongue 17, when the magnet 20 is moved in the direction of the arrows 24 and 25, the individual dividing tongues 17a, 17b and 18c are lifted from their mating contacts 14a, 14b and 14c at different times, and thus the corresponding ones Circuits interrupted.

The individual metal parts 18a to 18c can be so different be distanced with respect to the base line 23 that the one part tongue simultaneously with at least another part tongue is raised or that any part tongue is only raised when the previously lifted one has fallen off again. This results in additive or selective switching patterns.

Just for the sake of completeness it should be mentioned that of course the magnetically conductive parts 18a to 18c and the magnet 20 are also interchanged can and that instead of the illustrated embodiment with 3 dividing tongues 17a to 17c of course also a contact tongue 17 with a different number could be chosen by dividing reeds.

The magnetically conductive parts 18a to 18c can basically have the same length, if necessary but also different lengths.

In the embodiments described above, the magnetic force of attraction is always used. Of course, the arrangements could also be modified so that the contact is opened by magnetic repulsive forces. For this purpose, the fixed first contact 14 and the contact carrier 15 on the one hand and the movable contact 16 with contact tongue 17 would have to be reversed within the housing and the action of the magnets or the magnetically conductive parts 18, 20, 21 via a switch plunger 22 would have to take place to take place on ä ± e then underlying contact tongue 17th by Abstoßun _ö skräfte between the magnets 20 and 18 would be the Schaltstö ^ el 22, moves the reed 17 and therefore the movable contact 16 down and so an opening of the contacts 14 and 16 take place.

The magnetic switch described above can be used without Making problems watertight and explosion-proof. It enables relatively large switching capacities without additional Switching elements such as relays, thyristors, etc. Even if the contact tongue breaks, there is a defined one Off position of the contacts guaranteed.

By means of additional design measures known per se, the magnetic switch can also be used as a snap switch be formed.

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Claims (10)

Nuremberg, December 16, 1985 Reg. 28828 MAGNETIC SWITCH Claims: 1. Magnetic switch in a hermetically sealed Housing (11) with an electrically operated spring conductive contact tongue (17) »characterized that the contact tongue (17) itself consists of a magnetically non-conductive material, but is connected to a magnetically conductive material or a permanent magnet (18), with the help of which if a magnet (20) or a magnetically conductive material approaches enough powder, the spring action electrical contacts in contact position 16) can be released against the spring action. 2. Magnetic switch according to claim 1, characterized in that the magnetically conductive Part or the permanent magnet (18) on the contact tongue (17) adjacent in the housing wall also a magnetic conductive part (21) is arranged * 3. Magnetic switch according to one of claims 1 to 2, characterized in that Contact tongue (17) and associated magnet (18) via a Switching plungers (22) are connected to one another. 4. Magnetic switch according to one of claims 1 to 3 »characterized in that that both inside and outside the hermetically sealed housing (11) ver in their effect strengthening magnets (18, 20) are arranged. 5. Magnetic switch according to one of claims 1 to 4-, characterized in that opposing polarity magnets (18, 20) serving for the contact opening available for generating tightening forces 6. Magnetic switch according to one of claims 1 to 4, characterized in that the contact opening serving homopolar magnets (i8 _t 20) for generating repulsive forces are present. 7 · Magnetic switch according to one of Claims 1 to 6, characterized in that that the contact tongue (17) consists of a plurality of dividing tongues (17a, 17b, 17c) exists. 8. Magnetic switch according to claim 7 »characterized in that the magnetically conductive Parts (18a, 18b, 18c) extend over different lengths on the dividing tongues (17a, 17b, 17c). 9. Magnetic switch according to claim 7 or 8, characterized in that the magnetically conductive parts (18a, 18b, 13c) different distances from the base line (23) of the contact tongue (17) have. 10. Magnetic switch according to one of claims 7 to 9, characterized in that the tongues (I7a, 17b * 17c) have different lengths. Description: