Switching device with at least two intercommunicating extinguishing areas

Abstract

Switching device with closable contacts and an extinguishing chamber which is associated with the contacts and has a first extinguishing area and a second extinguishing area arranged directly adjacent to the first extinguishing area, the first extinguishing area and the second extinguishing area being spatially separated from each other by a partition wall, and the switching device being configured in such a way that a switching arc which is generated when opening the contacts is always blown away from the point where it is generated in one of the two extinguishing areas by means of an arc blowing means of the switching device and is caused to be extinguished, whereas the respective other of the two extinguishing areas is not used for extinguishing, characterized in that the partition wall between the first extinguishing area and the second extinguishing area has at least one overflow opening which connects the first extinguishing area to the second extinguishing area in such a way that plasma which is generated by the switching arc can flow from the extinguishing area in which the switching arc is caused to be extinguished into the respective other, unused extinguishing area.

Claims

1. A switching device, comprising: closable contacts; and an extinguishing chamber which is associated with the contacts, the extinguishing chamber comprising: a first extinguishing area configured to extinguish a switching arc generated by the contacts and directed into the first extinguishing area; and a second extinguishing area configured to extinguish the switching arc generated by the contacts and directed into the second extinguishing area, the second extinguishing area being arranged directly adjacent to the first extinguishing area, the first extinguishing area and the second extinguishing area being spatially separated from each other by a partition wall, the partition wall comprising a center region, a first end portion, a second end portion opposite the first end portion, and a top end portion extending from the first end portion to the second end portion; wherein the switching device is configured as a bidirectional switching device, with one of the first extinguishing area or second extinguishing area being used depending on a current direction, wherein the switching device is configured in such a way that the switching arc, which is generated when opening the contacts, is always blown away from a point where the switching arc is generated in one of the first extinguishing area or the second extinguishing area and is caused to be extinguished, wherein the partition wall between the first extinguishing area and the second extinguishing area has at least one overflow opening in the first end portion or the second end portion connecting the first extinguishing area to the second extinguishing area in such a way that plasma which is generated by the switching arc can flow from the first extinguishing area or the second extinguishing area in which the switching arc is caused to be extinguished into the other one of the first extinguishing area or the second extinguishing area.

2. The switching device according to claim 1, wherein the first extinguishing area or second extinguishing area each define a space having a first end closest to the point where the switching arc is generated, a second end opposite the first end and towards which the switching arc moves, a first side connecting the first end and the second end to each other and a second side opposite the first side and also connecting the first end and the second end to each other, wherein the partition wall forms a respective third side of the space and connects the first end, the second end, the first side and the second side to each other, and wherein the space further comprises a fourth side opposite the partition wall.

3. The switching device according to claim 2, wherein the at least one overflow opening is formed in a section of the partition wall, facing the first end and facing away from the second end.

4. The switching device according to claim 2, further comprising: extinguishing elements arranged at the second end or near the second end, into which the switching arc is driven and thereby caused to be extinguished.

5. The switching device according to claim 4, wherein the at least one overflow opening is formed between the extinguishing elements and a cover or a housing wall at the second end of the switching device in the partition wall.

6. The switching device according to claim 5, wherein the at least one overflow opening extends substantially over an entire width of the first extinguishing area or second extinguishing area, measured between the first side and the second side, so that the partition wall actually ends at a level of the extinguishing elements.

7. The switching device according to claim 1, wherein the at least one overflow opening is formed in the partition wall both on the first end portion and on the second end portion.

8. The switching device according to claim 1, wherein the switching device is of a closed design.

9. The switching device according to claim 8, wherein the switching device does not include a dedicated outlet opening to an environment for the switching arc and/or for plasma generated by the switching arc within the switching device, and wherein the switching device is not hermetically sealed for pressure compensation with an environment.

10. The switching device according to claim 9, wherein the not hermetically sealed switching device comprises a housing with gaps for pressure compensation with the environment.

11. The switching device according to claim 1, further comprising: an arc blowing means comprising permanent magnets, wherein arc blowing means blows away the switching arc from the point where it is generated in one of the first extinguishing area or the second extinguishing area.

12. A switching device, comprising: closable contacts; and an extinguishing chamber which is associated with the contacts, the extinguishing chamber comprising: a first extinguishing area configured to extinguish a switching arc generated by the contacts and directed into the first extinguishing area; and a second extinguishing area configured to extinguish the switching arc generated by the contacts and directed into the second extinguishing area, the second extinguishing area being arranged directly adjacent to the first extinguishing area, the first extinguishing area and the second extinguishing area being spatially separated from each other by a partition wall, the partition wall comprising a center portion, a first end portion, a second end portion opposite the first end portion, and a top end portion extending from the first end portion to the second end portion; wherein the switching device is configured as a bidirectional switching device, with one of the first extinguishing area or second extinguishing area being used depending on a current direction, wherein the switching device is configured in such a way that the switching arc, which is generated when opening the contacts, is always blown away from a point where the switching arc is generated in one of the first extinguishing area or the second extinguishing area and is caused to be extinguished, wherein the partition wall between the first extinguishing area and the second extinguishing area has at least one overflow opening at the top end portion proximate a cover or a housing wall of the switching device, the at least one overflow connecting the first extinguishing area to the second extinguishing area in such a way that plasma which is generated by the switching arc can flow from the first extinguishing area or the second extinguishing area in which the switching arc is caused to be extinguished into the other one of the first extinguishing area or the second extinguishing area.

Description

(1) An embodiment of the present invention is explained in more detail below with reference to drawings.

(2) FIG. 1 shows a perspective view of a switching device according to the invention with the front of the housing in an open state and the left wall of the housing in an open state,

(3) FIG. 2 shows a front view of the switching device according to the invention in FIG. 1 with the front of the housing in an open state,

(4) FIG. 3 shows a section through the switching device according to the invention in FIGS. 1 and 2 along section line III drawn in FIG. 2, and

(5) FIG. 4 shows a side view of the switching device according to the invention in FIGS. 1 to 3 on the housing side located on the left in FIGS. 1 to 3 with the left housing wall in an open state.

(6) In the following exemplifications, the same parts are designated by the same reference numerals. If a Figure comprises reference numerals which are not addressed in detail in the associated description of the Figure, reference is made to the preceding or following descriptions of the Figures.

(7) FIG. 1 shows a perspective view of a switching device 1 according to the invention. In order to be able to present the features or components relevant to the invention, both the front side of the housing facing the viewer and the left wall of the housing have not been shown in the presentation in FIG. 1. For the same reason, the front of the housing is not shown in the front view in FIG. 2.

(8) The switching device 1 has two fixed contacts 2, 3 which can be electrically connected to each other by means of a contact bridge 4. The drive of the contact bridge 4 is not important for the present invention and has therefore also not been shown further. The two fixed contacts 2, 3 project laterally from the housing 7 of the switching device 1 according to the invention and thus simultaneously form the connection contacts of the switching device.

(9) When opening the contacts, a switching arc 20 is generated, the base point of which on the contact bridge side is caused to jump over to the opposite fixed contact by means of an appropriately configured arc blowing means. The arc blowing means then drives the switching arc 20 into the extinguishing chamber above the two fixed contacts 2, 3, where it is extinguished. The extinguishing chamber is divided by a partition wall 13 into a front first extinguishing area 5 and a rear second extinguishing area 6. For the sake of completeness, it is to be noted that the switching device shown is a bidirectional switching device. When opening the contacts, a switching arc is generated both between the first fixed contact 2 and the contact bridge 4 and between the second fixed contact 3 and the contact bridge 4. Due to a special configuration of the contact bridge 4 and a corresponding design of the arc blowing means, the base point of one of the two switching arcs jumps over from the contact bridge to the respective opposite fixed contact, which leads to the extinction of the respective other switching arc. The remaining switching arc 20 is located either in front of or behind the partition wall 13, depending on the direction of current, so that either the first extinguishing area 5 or the second extinguishing area 6 is used to extinguish the switching arc, depending on the direction of current. That is one of the two extinguishing areas is not used during the switch-off process.

(10) The two extinguishing areas 5 and 6 of the extinguishing chamber have essentially a cuboid volume and begin above the two fixed contacts 2 and 3. The two fixed contacts 2 and 3 thus mark a lower first end 9 of the respective extinguishing area. The arc blowing means which is not shown in greater detail, is configured in such a way that it drives the switching arc 20 starting from the first end 9 of the extinguishing area to the opposite second end 10 of the respective extinguishing area, which in turn is formed by the upper side 17 of the housing. The housing wall on the left in FIG. 2 marks a first side 11 of the two extinguishing areas, while the housing wall on the right marks the opposite second side 12 of the two extinguishing areas. The partition wall 13 forms a third side of each of the two extinguishing areas. Each extinguishing area 5, 6 further has a fourth side 14 opposite the partition wall, which is formed by the respective front side of the housing or rear side of the housing, which is shown in particular in FIGS. 3 and 4.

(11) Each of the two extinguishing areas 5, 6 has a plurality of extinguishing elements into which the switching arc is driven and thereby is extinguished. The extinguishing elements protrude from the upper end of the partition 13 or extend between the partition wall and the opposite side of the housing. In the embodiment shown, these are simple extinguishing plates 15 on the one hand and cylindrical permanent magnets 16 on the other hand, each of which is encased in a protective sleeve, attract the switching arc to itself and at the same time act as extinguishing elements or extinguishing magnets. Here it is to be noted that in FIG. 1 only the extinguishing plates 15 and permanent magnets 16 of the front extinguishing area 5 are clearly visible. The rear second extinguishing area 6 also has corresponding extinguishing elements 15 and 16, which can be seen in particular in FIG. 4.

(12) The actual extinguishing space used by the two extinguishing areas 5 and 6 ends at the level of the extinguishing elements 15 and 16, since the switching arc 20 is caused to be extinguished by the extinguishing elements 15 and 16, assuming it does not already extinguish on its way to the extinguishing elements. On the housing side, housing ribs 18 are provided above the extinguishing elements 15 and 16. These project inwards from the top of the housing and extend over the entire depth of the two extinguishing areas 5 and 6. They prevent the arc from re-igniting above the extinguishing elements 15 and 16.

(13) As can be readily seen from the drawings, the switching device 1 according to the invention is a closed switching device. In order to increase the switching capacity while maintaining an extremely compact construction, the switching device according to the invention has overflow openings 8 in the central partition wall 13 between the two extinguishing areas 5 and 6. Two such overflow openings 8 are located laterally in the lower portion of the partition wall, i.e. at the lower first end 9 of the two extinguishing areas. The close proximity to the lower end and to the respective side wall 11 and 12 further guarantees an effective separation of the two extinguishing areas, at least as far as an unintentional propagation or displacement of the switching arc is concerned. At the same time, the overflow openings allow a certain gas exchange between the two extinguishing areas, which contributes decisively to preventing the plasma generated inside the housing due to the switching arc from escaping to the outside.

(14) Between the extinguishing elements 15, 16 and the upper side of the housing 17 there is a additional overflow opening 19 which extends over essentially the entire width of the two extinguishing areas, so that the partition wall 13 actually ends at the level of the extinguishing elements 15, 16. The additional overflow opening 19 increases the positive effect described above.

LIST OF REFERENCE NUMERALS

(15) 1 switching device 2 fixed contact 3 fixed contact 4 contact bridge 5 first extinguishing area 6 second extinguishing area 7 housing 8 overflow opening 9 first end of the extinguishing area 10 second end of the extinguishing area 11 first side of the extinguishing area 12 second side of the extinguishing area 13 partition wall or third side of the extinguishing area 14 fourth side of the extinguishing area 15 extinguishing element 16 extinguishing magnet 17 housing upper side 18 housing ribs 19 additional overflow opening 20 switching arc