CN106847625B

CN106847625B - Electrical switching device

Info

Publication number: CN106847625B
Application number: CN201610839883.4A
Authority: CN
Inventors: A.瓦赫特; R.科默特; G.莫瓦内
Original assignee: ABB Schweiz AG
Current assignee: ABB Schweiz AG
Priority date: 2015-09-23
Filing date: 2016-09-22
Publication date: 2020-04-24
Anticipated expiration: 2036-09-22
Also published as: EP3147927A1; CN106847625A; EP3147927B1; DE102015116085A1

Abstract

The invention relates to an electrical switching device (1) which is designed at least in one stage and has a housing (2) made of insulating material, wherein each pole (3,3 ') has at least one incoming and outgoing connecting contact (4, 4') and each of the connecting contacts (4,4 ') has a connecting contact busbar (5) and a first connecting piece (6, 6') for connecting to at least one external first electrical conductor, wherein at least one of the connecting contacts (4) has a second connecting piece (8) for connecting to a second electrical conductor (7). The second connecting part (8) is designed with a clamping mechanism for clampingly receiving the second electrical conductor (7), wherein the clamping mechanism is spaced from the connecting contact bus bar (5) in the direction of the outer side of the housing (2) and is electrically and mechanically connected to the connecting contact bus bar (5).

Description

Electrical switching device

Technical Field

The invention relates to an electrical, at least unipolar, switching device having a housing made of an insulating material, wherein each pole has at least one incoming and outgoing connecting contact (Anschlusskontakt), and each of the connecting contacts has a connecting contact busbar and a first connecting piece (Anschlussmitel) for connecting at least one external first electrical conductor, wherein at least one of the connecting contacts has a second connecting piece for connecting a second electrical conductor.

The invention relates to an electrical switching device according to the invention. The invention relates in particular to switching devices, such as motor protection switches, line protection switches or power switches (schuetz) protectors. However, programmable switching devices, such as programmable memory controllers or programmable relays, are also considered within the scope of the invention.

Background

Conventional switching devices, such as, for example, protective devices, have, on the input side and on the output side, for each pole to be switched on, a coupling contact in the form of a fixed contact. For connection or disconnection, the associated fixed contacts are connected or disconnected by a contact bridge driven by a magnetic drive. For such devices, the externally accessible fixed contact interface (Festkontaktanschluss) is usually formed by a screw joint that is accessible from the side (which can be screwed or unscrewed from the upper side of the device) or by a spring-clip joint that is accessible from the side or from above and can also be unscrewed from the side or from above.

DE 10236790C 1 discloses a switching device in which each pole has at least one incoming and outgoing connecting contact, and each of the connecting contacts has a first connecting piece for connecting an external first electrical conductor, and each of the connecting contacts has a second connecting piece for connecting a second electrical conductor.

The first coupling member is formed in the form of a conventional screw clamp fitting (Schraubklemmanschluss), a spring clamp fitting (e.g. a cage-tension spring clamp fitting), a knife clamp fitting or other coupling member. The additional second coupling element is formed as a bore receptacle in a contact carrier (kontaktraeger) which is designed as a tongue-shaped tab (Anschlussfahne). The second electrical connection conductor therefore has to be introduced into the housing from the housing side, here deeper, in order to reach the bore receptacle of the second connection part. And thus often can be inserted incorrectly. The bore receptacle removes the conductor material from the coupling contact busbar, so that the electrical resistance of the coupling contact busbar in the region of the bore receptacle increases, which is disadvantageous.

Disclosure of Invention

The object of the invention is to provide a switching device which is improved with regard to the connection technology of the second electrical conductor.

This object is achieved by a switching device according to the invention. According to the invention, the second connection part is designed with a clamping mechanism for the clamped reception of the second electrical conductor, wherein the clamping mechanism is spaced apart from the connection contact busbar in the direction of the outer side of the housing and is electrically and mechanically connected to the connection contact busbar. The clamping means for clampingly receiving the second electrical conductor is guided away from the coupling contact busbar and closer to the outside of the housing. The distance to the insertion opening in the outer side of the housing is thus reduced and the insertion of the second connection conductor is simplified, since the access to the bore receptacle is simpler, reducing the risk of incorrect insertion. The conductor cross section of the coupling contact busbar remains constant in the region of the clamping mechanism and therefore the electrical resistance of the coupling contact busbar also remains constant.

According to an advantageous embodiment of the invention, the second connecting part is designed with at least two spring arms which are provided at the connecting contact bus bar and at least partially delimit a receiving space for the external second electrical conductor, and the second electrical conductor can be introduced into the receiving space between the two spring arms and clamped therein due to the spring force of the spring arms in their return position.

The lead-in portion (Einf ü hrede) of the second electrical coupling conductor is clamped between the two resilient arms, so that a reliable mechanical and electrical connection can be established between the second coupling member and the second electrical conductor, without the lead-in portion of the second electrical coupling conductor needing to have the special feature of a resilient grip.

According to an advantageous embodiment of the invention, each spring arm is attached to a longitudinally extending holding beam which is fixed to the connecting contact busbar and which stands above the connecting contact busbar. The second coupling member thus projects out of the plane of the first coupling member, which is located above the first coupling member. It is advantageous, for example, if the electrical second connecting conductor should be inserted from above into the switchgear from the front.

According to an advantageous embodiment of the invention, each spring arm can be pivoted elastically in a plane perpendicular to the longitudinal extension of its holding beam.

According to an advantageous embodiment of the invention, the spring arms are designed as longitudinally extending clamping beams and are arranged parallel to one another and to the broad sides of the coupling contact bus bar.

According to an advantageous embodiment of the invention, the retaining beam is provided at the opposite narrow side of the coupling contact bus bar.

According to an advantageous embodiment of the invention, the holding beam forms an L-shape with the spring arm mounted thereon.

According to an advantageous embodiment of the invention, the torsional stiffness of the retaining beam in the direction of the pivoting movement of the spring arm has a greater value than the bending stiffness of the spring arm when it is bent in the direction of its longitudinal extent.

According to an advantageous embodiment of the invention, the retaining beam is configured as a plate-shaped beam, one side of which is arranged in a recess in the narrow side of the coupling contact busbar, and the wide side of which is oriented parallel to the longitudinal extension of the coupling contact busbar.

According to a further advantageous embodiment of the invention, the holding means is designed as a hole receptacle (Lochaufnahme) with a closed circumferential contour for receiving a plug contact (Steckkontakt) provided with a spring element of the second electrical conductor. In this embodiment, the bore receptacle is spaced apart from the coupling contact busbar, for example in the form of a metal disk with a bore receptacle, wherein the metal disk is electrically and mechanically connected to the coupling contact busbar by means of at least one connecting web (verindungssteg) serving as a distance holder to the coupling contact busbar. In this embodiment, the spring element for establishing the necessary contact force is contained at the end piece of the second connection conductor.

According to an advantageous embodiment of the invention, the first coupling part is designed as a screw clamp or as a spring clamp or as a blade clamp.

Further advantageous embodiments and improvements of the invention and further advantages can be derived from the description.

Drawings

The drawings and description are for a better understanding of the subject matter. Substantially identical or similar objects or parts of objects may be provided with the same reference numerals. The figures are only schematic illustrations of the invention.

Wherein:

figure 1 shows a view of a switching device according to the invention (with the housing partially removed) and a coupling contact,

figure 2 shows a detailed view of a coupling contact according to the invention,

figure 3 shows a detailed view of the second coupling member with the second coupling conductor before introduction according to the invention,

fig. 4 shows a detailed view of a second coupling part according to the invention with an introduced second coupling conductor.

List of reference numerals

1 switching device

2 casing

3 pole

3' pole

4 connecting contact

4' connection contact

4'' connection contact

5-connection contact-busbar

6 first coupling part

6' first coupling piece

6' first coupling member

7 external electrical conductor

8 second coupling member

8' second coupling member

9 elastic arm

10 resilient arm

11 accommodating cavity

12 holding beam

13 holding beam

14 broad side of a connecting contact bus bar

15 narrow side

16 narrow side

17 recess

18 holding the broad side of the beam

19 clamping arm

19' gripping arm

20 clamping spring

21 inner edge of elastic arm

22 inner edge of elastic arm

Inner edge of 23L-side leg

Inner edge of 24L-side leg

25 shorter L-legs

26 shorter L-legs.

Detailed Description

Fig. 1 shows a three-pole motor circuit breaker 1 with a housing 2 made of insulating material as an example for an electrical switching device according to the invention. The housing 2 is partially removed in the view of fig. 1 and opens the view of these three

coupling contacts

4,4',4 "on the inlet side, which are each associated with one of the three

poles

3,3',3" of the motor protection switch. The respective outgoing connection contact is located on the side of the motor circuit breaker 1 facing away from the observer of fig. 1. Each of the

connection contacts

4,4',4 ″ has a connection contact busbar 5 and a

first connection piece

6,6',6 ″ for connecting at least one external first electrical conductor. The

first coupling parts

6,6',6 ″ are designed here as spring-loaded terminals, wherein one of the spring-loaded terminals is of the plug-in or push-in type. Here, each spring clamping connection has a clamping spring with two clamping arms 19, 19' that can be actuated independently of one another, see fig. 2, so that the two first connecting conductors can be clamped independently of one another.

Here, each of the

coupling contacts

4,4',4 "has in this example a

second coupling member

8, 8', 8" for coupling a second electrical conductor 7, see fig. 3 and 4. The second electrical conductor can be a connection conductor to a mount or an accessory, which is mechanically connected with the housing 2 of the switchgear. The second electrical conductor is mechanically and electrically connectable or connectable to the pole 3 and the connection contact 4 of the switching device 1 in a mechanically and electrically good and fixed manner, and yet releasably connectable, via the second connection piece 8. In this case, the second connection element 8 is made of a material which conducts electricity well.

Fig. 2 shows a detail of the coupling contact 4. As a central part, it has an approximately plate-shaped coupling contact-busbar 5. The coupling contact busbar 5 has a rectangular recess in its front facing the viewer. The clamping spring 20 of the first coupling part 6 is supported at the edge of this recess. The first coupling part 6 corresponds in this respect to a plug spring contact known in principle.

The second connecting part 8 is located behind the first connecting part 6 in the direction of the longitudinal extent of the connecting contact bus bar. For this purpose, retaining

beams

12,13 are mounted on opposite

narrow sides

15,16 of the connecting contact busbar 5. Each holding

beam

12,13 is designed as a plate-shaped beam, which is accommodated on one side in a recess 17 in the

narrow sides

15,16 of the coupling contact busbar 5 and is oriented with its wide side 18 parallel to the longitudinal extension of the coupling contact busbar 5.

Each

retention beam

12,13 thus upstands above the coupling contact-busbar 5. The second coupling member 8 thus projects out of the plane of the first coupling member 6, which is located above the first coupling member 6. It is advantageous, for example, if the electrical second connecting conductor 7 is to be inserted from above and the first connecting part is to be inserted into the switching device 1 from the front or obliquely from the front.

The free ends of the holding beams 12,13 are provided with resilient arms 9,10, respectively. The holding beam 13 forms an L-shape with the spring arm 10 mounted thereto. The spring arms 9,10 are configured as longitudinally extending clamping beams and are arranged parallel to one another and to the broad side 14 of the coupling contact bus bar 5. Each spring arm 9,10 can thus be pivoted resiliently in a plane perpendicular to the longitudinal extension of its

holding beam

12, 13.

The rectangular cross section of the holding beams 12,13 and the fixation of their wide sides 18 parallel to the longitudinal extension of the coupling contact bus bar 5 result in the torsional stiffness of the holding beams 12,13 in the direction of the pivoting of the spring arms 9,10 having a greater value than the bending stiffness when bending in the direction of the longitudinal extension of the spring arms 9, 10.

These two resilient arms 9,10 thus form part of the lateral confinement of the housing 11 for the external second electrical conductor 7. The receiving space 11 has a rectangular cross section in this example, the longitudinal extension of which is oriented perpendicular to the longitudinal extension of the connecting contact busbar 5.

A second electrical conductor 7 can be introduced into the receiving space 11 between the two spring arms 9,10, see fig. 3. The cross section of the lead-in of the second electrical conductor 7 is greater than the cross section of the receiving space. The peripheral contour of the lead-in of the second electrical conductor 7 is wider in this example than the distance between the two

inner edges

22, 21 of the two spring arms 9,10 which extend in the longitudinal direction and point toward one another, but is narrower than the distance between the two

inner edges

23, 24 of the two retaining

beams

12,13 which point toward one another and form the free ends of the shorter L-leg 25, 26.

Upon introduction, the second electrical conductor thus presses the two spring arms 9,10 away from each other only. Since the torsional stiffness of the holding beams 12,13 in the direction of the pivoting movement of the spring arms 9,10 has a greater value than the bending stiffness when bending in the direction of the longitudinal extent of the spring arms 9,10, only the two spring arms 9,10 will pivot against their return spring force and thus receive a second electrical conductor between them. Due to the resilient force of the return of the resilient arms 9,10, the lead-in of the second electrical conductor is then clamped between these two resilient arms 9,10 and is thus mechanically held and well electrically connected, see fig. 4.

If the peripheral contour of the lead-in of the second electrical conductor is also greater than the distance of the two

inner edges

23, 24 of the two holding

beams

12,13 which point toward one another and form the free ends of the shorter L-leg 25, 26, the two holding

beams

12,13 are additionally bent away from one another in a direction perpendicular to their wide sides 18. Due to the resilient return force of the retaining beams 12,13, an additional clamping force component (caused by the two retaining beams 12,13) will then be generated.

As described above, the coupling contact 4 with the coupling contact busbar 5 and the second coupling part 8 can very advantageously be produced in one piece as a stamped and bent part from a material which conducts well, preferably metal.

A second embodiment (in which the clamping means is designed as a bore receptacle with a closed circumferential contour) is not shown here by way of the figures. This can be imagined very easily by a modification of the embodiment shown in fig. 2 and 3 (by instead of the two spaced-apart webs 9 and 10 a plate with a hole receptacle having a closed peripheral contour being fastened on top on the retaining beams 12, 13).

Claims

1. An electrical at least unipolar switching device (1) having a housing (2) made of insulating material, wherein each pole (3,3 ') has at least one incoming and outgoing connecting contact (4, 4') and each of the connecting contacts (4,4 ') has a plate-shaped connecting contact bus (5), a first connecting piece (6, 6') in the form of a spring-loaded joint for connecting at least one external first electrical conductor being formed on the connecting contact bus (5), wherein a second connecting piece (8) for connecting a second electrical conductor (7) is formed in at least one of the connecting contacts (4) on the connecting contact bus (5) and in the longitudinal extension direction thereof behind the first connecting piece (6),

characterized in that the second connection element (8) is designed with a clamping device for the clamping reception of the second electrical conductor (7), wherein the clamping device is spaced apart from the connection contact busbar (5) in the direction of the outside of the housing (2) and is electrically and mechanically connected to the connection contact busbar (5).

2. The switchgear device (1) according to claim 1, characterized in that the second coupling piece (8) is configured with at least two spring arms (9,10) which are provided at the coupling contact-busbar (5) and at least partially delimit a receiving chamber (11) for the external second electrical conductor (7), and in that the second electrical conductor (7) can be introduced into the receiving chamber (11) between the two spring arms (9,10) and can be clamped therein due to the spring force of the return of the spring arms (9, 10).

3. The switchgear (1) according to claim 1, characterized in that each resilient arm (9,10) is mounted at a longitudinally extending holding beam (12,13) fixed at the coupling contact-busbar (5), standing above the coupling contact-busbar (5).

4. A switching device (1) according to claim 3, characterized in that each resilient arm (9,10) is resiliently swingable in a plane perpendicular to the longitudinal extension of its holding beam (12, 13).

5. The switchgear (1) according to claim 4, characterized in that the resilient arms (9,10) are configured as longitudinally extending clamping beams and are arranged parallel to each other and to the broad side (14) of the coupling contact-busbar (5).

6. The switchgear (1) according to claim 5, characterized in that the retaining beams (12,13) are provided at opposite narrow sides (15,16) of the coupling contact-busbar (5).

7. The switchgear (1) according to claim 6 characterized in that said holding beam (13) forms an L-shape with a resilient arm (10) mounted thereto.

8. The switching device (1) according to claim 6, characterised in that the torsional stiffness of the holding beam (12,13) in the direction of oscillation of the resilient arm (9,10) has a value which is greater than the value of the bending stiffness when bending in the direction of longitudinal extension of the resilient arm (9, 10).

9. The switching device (1) according to claim 6, characterised in that the retaining beams (12,13) are configured as plate-shaped beams, one side of which is provided in a recess (17) in the narrow side (15,16) of the coupling contact bus bar (5), the wide side (18) of which is oriented parallel to the longitudinal extension of the coupling contact bus bar (5).

10. The switching device (1) according to claim 1, wherein the clamping mechanism is configured as a bore receptacle with a closed circumferential contour for receiving a plug contact of the second electrical conductor provided with a spring element.