DE102014226624B4 - Switching device - Google Patents

Abstract

Switching device with a drive unit, having a coil, a yoke and an armature which is connected to a contact system via a contact carrier, wherein the armature is covered by an electrically insulating material (1), characterized in that the material (1) is designed in the form of a cover over the three webs of the armature.

Description

The invention relates to a switching device with a drive unit, having a coil, a yoke and an armature, which is connected to a contact system via a contact carrier, the armature being covered by an electrically insulating material.

Switching devices, especially contactors, have a very high switch-on speed when the magnet system is closed. The armature with the contact carrier hits the yoke and the movable contact bridges from the off position hit the fixed contacts into the on position. Due to the high impact speed, the armature with the contact carrier and its movable contact bridges can rebound back into the off position. This is called “contact bounce.” This creates arcs between the movable contacts and the fixed contacts, which have a negative impact on the mechanical and electrical life of a switching device.

The arcs between the contacts of the contact system can be of varying intensity due to different starting currents when switching on and off. The arc development creates plasma vapor, which spreads within the switching device. This plasma vapor also contains a proportion of conductive silver material, which can shorten the distance between two phases above the armature, so that phase flashovers can occur that can destroy the switching device.

Another problem with electromechanical switching devices is that when the device is switched off by the stop, there is an increased amount of switching noise. The energy released during the switch-off process can, in the long term, cause the armature to break and thus destroy the switching device.

From the DE 1 514 099 A1 a relay or small contactor is known for use on circuit boards, in particular printed circuits, which form a structural unit with the circuit boards, in particular printed circuits, in that the circuit board is simultaneously the carrier of the essential parts of the relay or contactor.
The DE 6 751 537 U discloses an electromagnetic switch, in particular for electric starting motors of internal combustion engines, with a cup-shaped housing made of iron, a hollow cylindrical excitation winding seated therein, an iron core arranged within the winding and an armature guided in a longitudinally displaceable manner in the housing base.

The US 3,225,159 A describes a relay with a magnet and a nylon-coated piston.

The DE 10 084 279 B3 describes a method of making a changeover relay with an armature, comprising providing a magnetic plate having a flat first surface and a second surface having a flat main surface area parallel to the first surface and an inclined surface area which crosses the flat main surface area at an obtuse angle , and extends in a direction approaching the first surface; forming a non-magnetic layer of uniform thickness on the first surface of the magnetic plate in a region located opposite the inclined surface area; placing the second surface of the magnetic disk opposite a flat support plane, and placing the magnetic disk securely on the support plane; Pressing a region of the first surface with the non-magnetic layer to deform the magnetic plate while maintaining the uniform thickness of the non-magnetic layer until a surface of the non-magnetic layer shows a mirror image shape of the inclined surface area provided in the second surface, and the inclined surface area is shifted into a plane common to the flat main surface area; and forming the armature from the magnetic plate having a region of the nonmagnetic layer disposed on each of the pair of abutting surfaces.

From the DE 1 665 060 A1 An electrical contactor in a shell design is known, with one of the two half-shells being designed in such a way that it additionally contains the triggering device, such as thermal overcurrent and/or short-circuit current triggers, together with the associated devices, as well as an adjustment device, snap mechanism and help contact.

The US 3,215,800 A discloses electromagnetic devices, and in particular electromagnetic control relays, suitable for being mounted on a control panel and forming part of a control system for an electrically powered machine.

Accordingly, the object of the invention is to create a switching device which at least partially solves the above-mentioned problems.

This task is solved by the features of claim 1. Further training and further education, either individually or in combination with one another can be used are the subject of the dependent claims.

This task is solved by a switching device with a drive unit, which has a coil, a yoke and an armature, which is connected to a contact system via a contact carrier, the armature being covered by an electrically insulating material. The invention is characterized in that the material is designed in the form of a shell over the three webs of the anchor.

The core of the invention is that two technically unrelated problems can be solved in a simple manner in an overall concept. According to the invention, the electrical insulation and the damping of the switching process are achieved by an armature-enveloping material. The material is selected so that it has electrically insulating properties. The special design of the covering over the three webs of the armature ensures that phase flashovers are avoided.

The casing can be designed in two parts, for example in that a first casing encompasses the three webs of the anchor and a second casing is designed as a cover. This cover also ensures the flexibility of the anchor, which the first cover should also provide.

In order to implement these requirements, rubber is preferably used as the enveloping material. Rubber offers the possibility of tracing the contours of the anchor with appropriate flexibility, has electrically insulating properties and can be used as a damping material. In this way, phase flashovers can be avoided and switching noises that occur during the switching process can be dampened.

In a continuation of this inventive concept, it can be provided that the material has damping properties. In this way, two technically unrelated problems can be solved in a simple manner. The material surrounding the armature is preferably designed to be both electrically insulating and to dampen switching noise.

In a special embodiment of the invention, a further concept can be that the material is made of rubber. Rubber makes it possible to design the casing for the anchor with the necessary flexibility for the anchor. In addition, rubber is a cost-effective material that is also easy to process.

In a continuation of this concept according to the invention, it can be provided that the top of the anchor is formed with a cover made of the material. The cover on the top of the armature serves as cushioning between the armature and the contact carrier during the switching process.

In a special embodiment of the invention, a further concept can consist of the cover having at least one projection which serves as a damping element between the armature and the contact carrier. The projections or material reinforcements integrated into the cover increase the damping, especially when switching off.

In a special embodiment it can be provided that the switching device is a contactor. The technical problems presented above occur particularly among shooters.

The switching device according to the invention has a drive unit which has a yoke, a coil and an armature which is connected to a contact system via a contact carrier. The anchor is covered by an electrically insulating material. The covering can preferably be designed in two parts, with a first covering covering the three webs of the anchor and a second covering covering the top of the anchor. The cover can preferably have projections or material reinforcements which are arranged on the top of the cover, in the direction of the contact carrier, and which particularly dampen the stop points during the switching process.

The present invention is characterized by the fact that two technically unrelated problems were solved in a simple manner in an overall concept. According to the invention, the electrical insulation and the damping of the switching process are implemented by an armature-enveloping material. The material is selected so that it has electrically insulating properties and damping properties.

Further advantages and embodiments of the invention are explained below using an embodiment and the drawing.

• 1 in einer perspektivischen Darstellung ein Ausführungsbeispiel eines ankerumhüllenden Materials mit Abdeckung;
• 2 in einer perspektivischen Darstellung die Abdeckung für den Anker.

Show schematically:

• 1 in a perspective view an embodiment of an anchor-enveloping material with a cover;
• 2 in a perspective view the cover for the anchor.

1 shows an exemplary embodiment of an anchor-enveloping material 1 with a cover 2. The covering can preferably be designed in two parts, in that a first covering 3 covers the three webs of the anchor and a second covering 4 covers the top of the anchor. The cover 2 can preferably have projections 5 or material reinforcements, which are arranged on the top 6 of the cover 2, in the direction of the contact carrier, and particularly dampen the stop points during the switching process.

2 shows the cover 2 of the anchor with the projections 5, which serve as material reinforcements at the anchor points.

The present invention is characterized by the fact that two technically unrelated problems were solved in a simple manner in an overall concept. According to the invention, the electrical insulation and the damping of the switching process are implemented by an armature-enveloping material. The material is selected so that it has electrically insulating properties and damping properties

Reference symbol list

1

material

2

cover

3

First wrap

4

Second wrap

5

head Start

6

Top

Claims (6)

Switching device with a drive unit, comprising a coil, a yoke and an armature, which is connected to a contact system via a contact carrier, the armature being covered by an electrically insulating material (1), characterized in that the material (1) is in the form a shell is formed over the three webs of the anchor. switching device Claim 1 , characterized in that the material (1) has damping properties. switching device Claim 1 or 2 , characterized in that the material (1) is made of rubber. Switching device according to one of the Claims 1 until 3 , characterized in that the upper side of the anchor is formed with a cover (2) made of the material (1). Switching device according to one of the preceding claims, characterized in that the cover (2) has at least one projection (5) which serves as a damper between the armature and the contact carrier. Switching device according to one of the preceding claims, characterized in that the switching device is a contactor.

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