EP0855085A2

EP0855085A2 - Housing for switchgears

Info

Publication number: EP0855085A2
Application number: EP96945156A
Authority: EP
Inventors: Hans Pfab; Manfred Schmidt; Norbert Zimmermann; Norbert SÖRGEL; Peter Donhauser
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 1995-10-12
Filing date: 1996-10-10
Publication date: 1998-07-29
Anticipated expiration: 2016-10-10
Also published as: DE59601735D1; WO1997014166A2; WO1997014166A3; EP0855085B1; US6583695B1

Abstract

In order to reduce bouncing of the main armature and contact carrier when switching a contactor, the magnetic chamber bottom (9) of the contactor housing (1) is provided with two supporting areas for the magnet yoke which have different resiliencies. For that purpose, the vibrating magnet chamber bottom (9) has a supporting strip whose ends act as magnet supporting areas (11, 12).

Description

1 description

Switchgear housing

The invention relates to a switchgear housing for an electromagnetic switchgear, which has a magnetic chamber with a magnetic yoke and a magnet armature, two magnetic support areas with different elastic suspension for bearing the magnetic yoke being provided on the magnetic chamber bottom of the switchgear housing .

Generic switchgear housings are known in commercially available contactors. Here, the magnetic yoke of the magnet system is mounted on a hard and a relatively soft support point in order to dampen shock vibration processes as occur when closing an AC magnet as a result of relatively high closing speeds as well as possible. Due to the shock vibrations, the magnet armature with the contact carrier can bounce back into the "OFF" position. Up to now, this problem has been attempted to be solved by the two differently sprung support points, with which the translational movement is partly redirected into a rotational one.

The invention has for its object to design a switchgear housing of the type mentioned above such that rebounding of the armature is reduced in a simple and effective manner.

The object is achieved in that the magnetic chamber base is designed to be capable of oscillation and has a support strip on its surface facing the interior of the switchgear housing, the ends of which serve as magnetic support areas, with a first magnetic support area at one end ¬ is finally held by the magnetic chamber floor.

Advantageous developments of the invention can be found in the subclaims. It is particularly advantageous if the second magnet support area is ribbed with closed frame profiles, since a hard resilient magnet support area is hereby implemented in a simple manner. If an embossed rubber is inserted between the magnetic yoke and the support strip, the spring properties of the soft magnetic support area can be influenced in particular depending on the height of the support strip.

Problems with creepage distances and air gaps between the magnet system and the underside of the switchgear housing serving as assembly are excluded by the fact that the magnet chamber bottom is closed.

An embodiment of the invention is explained in more detail below with reference to a drawing. Show it:

1 shows an exploded view of a magnet system in a contactor housing, FIG. 2 shows a bottom view of a perspectively illustrated contactor housing with a magnetic chamber base, FIG. 3 shows an interior view of the protective housing according to FIG. 2 with the magnetic chamber base in a perspective view,

4 shows a basic representation of the spring characteristic of the magnetic chamber base and 5, 6, 7 transverse views of differently designed support strips.

1 shows a switching device housing 1 with an alternating current magnet system for an electromagnetic switching device. In the present case, it is the housing 1 of a contactor 2, in the magnet chamber 3 of which the magnet system is accommodated. This essentially consists of a magnetic yoke 4, a magnet armature 5, a coil 6 with coil connections, a contact carrier 7 and a conical spring 8 Magnet system is mounted with its magnet yoke 4 on the magnet chamber bottom 9 of the contactor housing 1 with the interposition of an insert rubber 10. The magnet chamber base 9 is formed with two magnet support areas 11, 12, which are not shown here and have different springs. One magnetic contact area 11 has a soft, the other 12 a relatively hard suspension (see FIG. 3).

2 shows the underside of the contactor housing 1 with the closed magnetic chamber base 9 and frame profiles 15. 3 shows an interior view of the contactor housing 1 with the magnet chamber bottom 9. The magnet support areas 11, 12 are formed on the inside of the magnet chamber bottom 9 as support strips, one end of which is enclosed on all sides by the magnet chamber bottom 9 and its other end merges into a wide, reinforced area 13. These two ends serve as magnetic support areas 11, 12 with the soft and hard suspension already mentioned. Four ribs 14 protruding from the magnet chamber base 9 serve to guide the magnet yoke 4 laterally. The magnet chamber base 9 is made relatively thin-walled. The soft magnetic contact area 11 of the contact strip is surrounded on all sides by the magnetic chamber base 9, which on the other hand is connected to the walls of the contactor housing 1 with the greatest possible distance. The other, hard magnetic support area 12 is ribbed with closed frame profiles 15 according to FIG. 2. The wide area 13 provides a wide magnetic support for the magnetic yoke 4 on the hard support side, while there is a narrow, not completely continuous magnetic support on the soft support side.

The contactor housing 1 described above is rebound-optimized due to the special design of the magnetic chamber base 9. This means that the shock vibration processes, which result from the relatively high closing speed when closing an AC magnet, are cushioned extremely well, without the magnet armature 5 contacting the contact carrier. eng 7 (see FIG. 1) bounces back notably into the "OFF" position.

The bottom of the magnetic chamber 9 is completely closed at the bottom, so that any problems with creepage and air gaps between the coil 6 and the underside of the contactor housing 1 used as the mounting plane are excluded from the outset.

The effect of the contactor housing 1 described above is based on the following technical measures. The very thin magnetic chamber base 9 connected on all sides with the soft support area 11 results in a progressive spring characteristic. As a result, the damping component caused by the protective housing 1 is not as dependent on temperature and humidity as e.g. a resilient cantilever with linear characteristic. Above all, this is due to the elasticity property of the plastic used, which is dependent on the temperature and the moisture content. The cushion rubber 10 has the following influence on the damping effect. It is at rest, i.e. on the soft support area 11 and after its deflection comes to rest over a large area on the magnetic chamber base 9. 4 shows spring characteristics 16, 17 for reproducing the spring properties of the magnetic chamber base 9. The spring characteristics 16 below show in principle the effect when inserting a rubber insert 10, the upper spring characteristics 17 when such an insert is dispensed with. The spring characteristics 16, 17 initially have a relatively flat course and then increase progressively, i.e. the power requirement grows disproportionately with increasing spring travel or greater deflection.

The damping components, which increase disproportionately in the progressive range of spring characteristics, result in a damping system which very well covers the closing speed range, which is dependent on the operating voltage, the phase angle, the temperature and other influencing parameters. The spring action can be adapted to the desired damping by different design of the support strip with regard to its length a, its width b and its heel height h. 5, 6 and 7 show different training options. 5 and 6 show designs of the support strip with different widths b. In Figure 7, the support strip is provided with an ^' oblique transition.

Although the present invention is explained with reference to the embodiment shown in the accompanying drawing, it should be borne in mind that it is not intended to limit the invention to the embodiment shown, but rather all possible changes, modifications and equivalent arrangements insofar as they are covered by the content of the claims.

Claims

claims

1. Switchgear housing (1) for an electromagnetic switching device (2), which has a magnetic chamber (3) with a magnetic yoke (4) and a magnet armature (5), the bottom of the switching device on the magnetic chamber bottom (9) -Housing (1) two magnetic support areas (11, 12) with different elastic suspension for mounting the magnetic yoke (4) are present, characterized in that the magnetic chamber base (9) is designed to vibrate and on it the interior of the switching devices - Housing (1) facing surface has a support strip, the ends of which serve as magnetic support areas (11, 12), a first magnetic support area (11) being held at one end exclusively via the magnetic chamber base (9).

2. Switchgear housing according to claim 1, so that the other end of the support strip has a second magnetic support area (12) with increased rigidity compared to the rest of the support strip.

3. Switchgear housing according to claim 1 or 2, d a d u r c h g e k e n n z e i c h n e t that the second magnetic support area (12) with closed frame profiles (15) is ribbed.

4. Switchgear housing according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that an insert rubber (10) is inserted between the magnetic yoke (4) and the support strip.

5. Switchgear housing according to one of the preceding claims, characterized in that the magnetic chamber bottom (9) is closed.

6. Switchgear housing according to one of the preceding claims, since you r ch g e k enn z e i c hn e t that the soft support area (11) has a progressive spring characteristic.

7. Switchgear housing according to one of the preceding claims, since you r c h g e k en n z e i c hn e t that the damping property of the magnetic chamber base (9) can be tuned by the length, width and height of the support strip.

Switchgear housing according to one of the preceding claims, since you r c h g e k enn z e i c hn e t that the fine tuning is also achieved by a special shape, e.g. through an oblique transition.