EP1686602B2 - Blast nozzle mounting means for electrical circuit breaker - Google Patents

Description

TECHNICAL AREA

The invention relates to the field of high-voltage technology, in particular high-voltage switch technology in electrical energy distribution networks. It is based on an interrupter unit for a switching device and a switching device according to the preamble of the independent claims.

STATE OF THE ART

In the EP 0 809 268 B1 a circuit breaker with a switch drive is shown, which moves the first arcing contact and which also drives the opposite second arcing contact via an auxiliary gear articulated to the insulating material nozzle. For the articulation of the auxiliary gear, the insulating material nozzle has a bead or flange on the outer surface at its first end. A first clamping ring is pushed over the bead and is snapped into place behind it. From the push-on side, a second clamping ring is attached to the nozzle end to prevent the first clamping ring from being unlocked. The auxiliary gear to be driven is attached to the second clamping ring. At the opposite, second nozzle end, the nozzle is connected to the switch drive in that the nozzle again has a bead or flange at the force-introducing point, which is clamped and screwed between two massive force-transmitting components. This results in a voluminous holding device for fastening the nozzle to the components driven by the switch drive.

The invention is based on the prior art U.S. 5,424,503 went out. There, a generic interrupter unit for an electrical switching device with a first, movable contact part with an insulating material nozzle and a second contact part is disclosed. The insulating material nozzle has a nose and is held there in the axial direction by the nominal current contact formed as a clamping bracket and is pressed against a carrier body. The clamping device also comprises a retaining ring which fixes the end of the nominal current contact on the carrier body by radial clamping.

In the FR 2 093 339 A an electrical self-blowing switch is shown with an insulating material nozzle, which is pushed onto a holder and thus held in place by clamping. The insulating nozzle is constructed in two parts for a simplified assembly of the contacts in the switch and comprises a base body and an extension piece, both made of plastic. Conventionally, the extension piece was glued seamlessly to the base body. The extension piece is now connected to the base body in a removable or exchangeable manner, in that there is an external groove on the base body and an internal groove on the extension piece and an annular wedge engages in the internal groove and external groove. The ring-shaped wedge is soft and can be serrated on its inside to prevent it from slipping. Although this type of soft wedging allows the lightweight extension piece to be clamped on the base body, it would be unsuitable for clamping the insulating material nozzle on the component. Since the ring-shaped wedge is arranged in a heavily field-loaded zone, it should also be made of plastic. During assembly, the annular wedge is pushed through an opening into the inner groove and outer groove in order to wedge the extension piece and the base body together.

DISCLOSURE OF THE INVENTION

The object of the present invention is to provide a simplified, more compact mounting of the insulating nozzle on a component that transmits the drive movement in a switching device with an insulating nozzle for blowing the arc. According to the invention, this object is achieved by the features of the independent claims.

The invention consists in an interrupter unit for an electrical switching device for power supply networks, in particular a high-voltage switch, the switching device having a central axis and at least one first contact part with an insulating nozzle for blowing an arc and a second contact part, with at least one of the contact parts being movable by a switch drive There is a holding device for connecting the insulating material nozzle to a component of the interrupter unit that can be moved by the switch drive, the holding device also being a clamping device which creates a mechanical connection between the insulating material nozzle and the component by means of a clamp mount and without screwing. The clamping device reduces the machining of the insulating material nozzle to a minimum and there are no holes or slots in the insulating material nozzle. No additional fasteners or components are required. The clamping device is neither screwed nor fastened to the insulating material nozzle or to the component, but only creates an essentially positive and non-positive connection between the insulating material nozzle and the movable component by clamping or pressing together.

The clamping device comprises a retaining ring which is supported on the component. The retaining ring ensures that the insulating material nozzle is fixed in an exact alignment coaxially to the central axis of the interrupter unit.

According to the invention, the retaining ring fixes the insulating material nozzle in the axial direction by clamping, the retaining ring having a retaining surface for securing the insulating material nozzle against sliding out in a first axial direction.

The embodiment according to claim 3 has the advantage that the nozzle made of insulating material can be installed in a simplified manner, particularly in switching devices with contact parts driven on both sides or with a shielding electrode that can be moved via an insulating nozzle.

Further embodiments relate to a structural design of the clamping device in claim 4, and to a clamping device of the insulating material nozzle on the switch drive side in claims 5-8. Claims 9-10 relate to versions with a clamping device on the switch side facing away from the switch drive.

The embodiments according to the invention according to claims 1 and 2 with a retaining ring and groove have the advantage that the fastening of the insulating material nozzle on the buffer cylinder of the interrupter unit is extremely compact. This solution is particularly advantageous for buffer cylinders according to claim 5, which are made in so-called copper technology, i. H. by deforming very thin copper sheets or copper pipes or generally by deforming sheets or pipes made of other electrically conductive materials.

The embodiments according to claims 6-7 have the advantage that the mechanical manufacturing and assembly tolerances can be increased by the spring element and possibly protective element and at the same time a high-precision axial alignment of the insulating material nozzle in the interrupter unit is achieved.

Claims 11-13 relate to an electrical switching device with an arc interrupter unit as described above and with the advantages mentioned there.

Further embodiments, advantages and applications of the invention emerge from the dependent claims, from the claims combinations and from the description and figures that now follow.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1

ein gattungsgemässes Schaltgerät umfassend ein erstes Kontaktteil mit Isolierstoffdüse und ein zweites Kontaktteil mit Kontaktstift und Kontakttulpe;

Fig. 2

herkömmliche Montagemittel zur Befestigung der Isolierstoffdüse am ersten Kontaktteil;

Fig. 3a, 3b

ein Ausführungsbeispiel der Erfindung mit spezieller Haltevorrichtung zur Befestigung der Isolierstoffdüse am ersten Kontaktteil;

Fig. 4, 6

Ausführungsbeispiele für Federsicherungsringe zur Klemmung der Isolierstoffdüse; und

Fig. 5a, 5b

ein weiteres Ausführungsbeispiel mit spezieller Haltevorrichtung zur Befestigung eines zu bewegenden Teils an der Isolierstoffdüse.

It show schematically

Fig. 1

a generic switching device comprising a first contact part with an insulating nozzle and a second contact part with a contact pin and contact tulip;

Fig. 2

conventional mounting means for fastening the insulating material nozzle to the first contact part;

Figures 3a, 3b

an embodiment of the invention with a special holding device for attaching the insulating material nozzle to the first contact part;

Fig. 4, 6

Embodiments for spring locking rings for clamping the insulating material nozzle; and

Figures 5a, 5b

Another embodiment with a special holding device for fastening a part to be moved to the insulating material nozzle.

In the figures, the same parts are provided with the same reference symbols.

WAYS OF CARRYING OUT THE INVENTION

Fig. 1 shows for an electrical switching device 1, here an example of a circuit breaker, the arcing arc interrupter unit in a schematic and partial representation. The interrupter unit has a central axis 1 a and at least one first contact part 2 with an insulating material nozzle 4 for blowing an arc, as well as a second contact part 3. The contact parts 2, 3 are typically arranged concentrically with respect to the central axis 12. At least one of the contact parts 2, 3 can be moved by a switch drive (not shown). The first contact part 2 here comprises a first arcing contact 2a in the form of a contact tulip 2a and an externally arranged first rated current contact 2b in the form of a contact tube 2b, which is designed as a continuation of the wall 50 of a buffer cylinder 5. In the case of self-blowing switches (as shown by way of example), the buffer cylinder 5 has a heating volume 51 and a precompression volume 52, which are separated by a base 53 with a valve flap. The second contact part 3 here comprises a second arcing contact 3a in the form of a contact pin 3a and, on the outside, a second rated current contact 3b in the form of a contact tulip 3b. The insulating material nozzle 4 is attached, for example, to the first contact part 2 on the rated current contact 2b. Main nozzle 4 and auxiliary nozzle 6 delimit the heating channel 64. When switching, extinguishing gases flow from the buffer cylinder 5 through the heating channel 64 to the front opening of the main nozzle 4 and blow the arc. It should be pointed out that the invention described below can be used in self-inflating switches, in buffer switches or also in other switch types or switching devices with other switch principles.

Fig. 2 shows conventional embodiments for attaching the main or insulating material nozzle 4 to the movable component 5, here the buffer cylinder 5. So far, buffer cylinders 5 with a considerable wall thickness have been used, in which a bore 7, 8a was inserted in order to screw the insulating material nozzle 4 to the buffer cylinder wall 50 . The bore 7 can be guided directly into the insulating material nozzle 4 or into a mounting block 8, the mounting block 8 pressing onto the end face 41 of the insulating material nozzle 4 and thereby fixing it on one side. On an opposite side, the insulating material nozzle 4 has an incision or recess 40 into which a projection or projection 20 in the rated current contact tube 2b engages and thereby also fixes the insulating material nozzle 4 on the other side.

According to the invention, a holding device for connecting the insulating material nozzle 4 to a component 5 which can be moved by the switch drive; 13, 14 of the interrupter unit present, the holding device as a clamping device 9, 10, 11; 12 acts, which by clamping 9, 5a, 5b, 5c; 12, 13a, 13b, 13c and, without a screw connection, a mechanical connection between the insulating material nozzle 4 and the component 5; 13, 14 creates. The The invention can be used at the first end on the switch drive side or at the second end of the insulating material nozzle 4 facing away from the switch drive.

The clamping device preferably comprises 9, 10, 11; 12 a retaining ring 9, 12, which is supported on the component 5, 13 and fixes the insulating material nozzle 4 in the axial direction 91, 92 by clamping, the retaining ring 9, 12 ensuring that the insulating material nozzle 4 is fixed in an exact alignment coaxially to the central axis 1a. The term ring or ring-shaped in the following also includes ring segment or partially ring-shaped. The coaxial alignment is necessary because between the outer diameter D _{2 of} the arcing contact pin 3a and the inner diameter of the insulating nozzle 4 ( Fig. 1 ) a small distance tolerance of approximately 1 mm to a few mm over the entire length of the contact pin 3a in the nozzle 4 is to be maintained. Correspondingly small tolerances should be maintained in the coaxial alignment in order to reliably rule out any tilting of the arcing contact pin 3 a in the insulating material nozzle 4.

The clamping device 9, 10, 11; 12 and / or the insulating material nozzle 4 can be rotated about the central axis 1a during assembly relative to the component 5, 13. In a preferred structural embodiment, the clamping device 9, 10, 11; 12, in particular the retaining ring 9, 12, a retaining surface 9a, 12a for securing the insulating material nozzle 4 against sliding out in a first axial direction 91 and / or a clamping surface 9b, 12b for supporting the clamping device 9, 10, 11; 12 on the component 5; 13, 14 in the first axial direction 91.

Figures 3a, 3b shows a first embodiment in which the component 5 is a movable buffer cylinder 5 with a buffer cylinder wall 50, which has an inner groove 5a and the clamping device 9, 10, 11 comprises a spring locking ring 9, which by engaging in the inner groove 5a and protruding from the Inner groove 5a fixes the insulating material nozzle 4 radially inward on the buffer cylinder 5 and transmits a switch drive force acting in the axial direction 91, 92 from the buffer cylinder 5 to the insulating material nozzle 4. The protrusion ensures, in particular, that the spring locking ring 9 is mechanically connected to an end face of the insulating material nozzle 4 and exerts a retaining force on the end face. The groove depth or penetration depth T _{1 of} the inner groove 5 a in the buffer cylinder wall 5 should be selected to be smaller than a ring width B _{1 of} the spring locking ring 9 for this purpose.

The buffer cylinder wall 50 is advantageously made from a sheet metal or tube, in particular a copper sheet or copper tube, and has a wall thickness of less than 7 mm, preferably less than 5 mm, particularly preferably less than 3.5 mm; and / or the inner groove 5a has a puncture depth T ₁ in a range from 0.8 mm to 3.0 mm, preferably 1.0 mm to 2.0 mm, particularly preferably equal to 1.5 mm. A decisive advantage of the clamp fastening is that components 5 with walls 50 made of thin, possibly deformed metal sheets or tubes can be positively and non-positively connected to the insulating material nozzle 4 by pure clamp fastening. Such sheets or tubes are preferably made of copper. This so-called copper technology is detailed in the European patents EP 0 735 555 and EP 0 806 049 described.

Fig. 4 shows a Seeger ring 9, known per se, as a spring locking ring 9. The ring width B ₁ is selected so that the aforementioned front retaining surface 9a and clamping surface 9b are large enough to absorb and transmit the clamping forces. During assembly, the Seeger ring 9 is pulled together with special pliers engaging in the holes 9c, inserted in the axial direction 92 into the buffer cylinder 5 and snaps into the inner groove 5a in the buffer cylinder wall 50.

In Figures 3a, 3b also contains a further exemplary embodiment in which the clamping device 9, 10, 11 comprises an annular spring element 11 which can be resilient in the axial direction 92 and which is arranged between the spring locking ring 9 and the insulating material nozzle 4, in particular there in a recess 42 of the insulating material nozzle 4. The spring element 11 can be, for example, a commercially available O-ring 11, a spiral spring, a wave spring or a plate spring for generating an axial spring force. As shown, the inner groove 5a can have a chamfer 5c for the injury-free insertion of the spring element 11. The spring element 11 creates an axial and transverse tolerance of the component 1 and the insulating material nozzle 4 during assembly and at the same time brings about an exact alignment of the nozzle 4.

A further improvement is achieved when an annular protective element 10, preferably a washer 10, for mechanical and thermal protection of the spring element 11 and the insulating material nozzle 4 is arranged between the spring locking ring 9 and the spring element 11 and is supported on a dimensionally stable projection 43 of the insulating material nozzle 4 . The interaction of the protective element 10 with the dimensionally stable, force-absorbing projection 43 ensures that no permanent deformation of the Teflon material of the insulating material nozzle 4 occurs under the contact pressure. The protective element 10 can be integrated into the clamping device 9, 10, 11, in particular into the spring locking ring 9 (not shown).

Figures 5a, 5b shows a second embodiment in which the clamping device 12 has a second retaining surface 12d for securing the insulating material nozzle 4 against sliding out in a second axial direction 92 opposite to the first axial direction 91 and / or the clamping device 12 has a second clamping surface 12c for supporting the clamping device 12 the component 13 in the opposite second axial direction 92. The movable component 13, 14 can be a coupling element 13 act for a movable part 14 to be driven, in particular for a movable shielding electrode or for an auxiliary gear 14 of the switch drive. The coupling element 13 has an inner groove 13a and the insulating material nozzle 4 has an outer groove 44, and the clamping device 12 comprises a spring locking ring 12, which engages in the inner groove 13a and the outer groove 44 at the same time in the manner of a snap lock. For this purpose, the groove depth or puncture depth T _{2 of} the inner groove 13a is selected to be smaller than the ring width B _{2 of} the snap lock 12. The spring locking ring 12 or snap lock 12 replaces a conventional assembly in which the two parts 4, 13 are connected to one another via a thread. The snap lock 12 has the advantage of a simple, form-fitting and force-fitting assembly and a connection rotatable during assembly, through which, for. B. the rack 14 can be brought into a suitable position for the transmission. As a result of the possible rotatability, the moving contact 2 or buffer cylinder 5 can alternatively be brought into any azimuthal position, so that the contact 2 can be aligned with one of the phase connections which are arranged inclined to the outside.

Fig. 6 shows an embodiment of such a spring locking ring 12. The spring locking ring 12 can be a ring segment 12 with an arc length in the range from 180 ° to 280 °, preferably 200 ° to 250 °, particularly preferably 230 °. The area is limited upwards or downwards by a sufficient expandability or a sufficient radial clamping effect of the spring locking ring 12 in the assembled state. The spring locking ring 12 should therefore be able to be bent open and introduced radially from the outside into the outer groove 44. The spring locking ring 12 should also be able to be pressed completely into the outer groove 44 when the component 13, 14 is pushed on. For this purpose, in particular the groove depth or penetration depth T _{3 of} the outer groove 13a is selected to be deeper than the ring width B _{2 of} the snap lock 12. In the pushed-on state of the component 13, 14, the spring locking ring 12 should also spring back into the inner groove 13a or be able to snap into place by means of an elastic restoring force. For this purpose, the spring locking ring 12 is made of an elastic material such as. B. be made of spring steel.

The invention also relates to an electrical switching device for a power supply network, in particular a switching device with a movable insulating material nozzle 4 for blowing the arc, for example a high-voltage switch, high-current switch or circuit breaker, which has the interrupter unit described above.

In such a switching device, the insulating material nozzle 4 can be connected to a movable component 5, 13, 14 on both sides by a clamping device 9, 10, 11; 12 be connected, both clamping devices 9, 10, 11; 12 by clamping bracket 9, 5a, 5b, 5c; 12, 13a, 13b, 13c and without screwing each create a positive and non-positive connection between the insulating material nozzle 4 and the associated component 5, 13, 14. For example, there is a first clamping device 9, 10, 11 for mechanically connecting the insulating material nozzle 4 to a movable buffer cylinder 5 of the interrupter unit and a second clamping device 12 for mechanically connecting the insulating material nozzle 4 to a coupling element 13 for a part 14 of the interrupter unit to be driven. The part 14 to be driven can be a movable shielding electrode or an auxiliary gear 14, e.g. B. for a contact system 2, 3 driven on both sides.

REFERENCE LIST

1

Electrical switching device, high-voltage switch, circuit breaker

1a

Central axis, switch axis

2

First contact part (with insulating nozzle)

2a

First arcing contact, arcing contact tulip

2 B

First nominal current contact, contact tube

20th

Overhang, protrusion in the rated current contact tube

3

Second contact part, tulip / pin contact, current path contact, mating contact

3a

Second arcing contact, arcing contact pin

3b

Second rated current contact, rated current contact tulip

4th

Insulating nozzle

40

First incision, first recess in the nozzle

41

Face of the nozzle

42

Second incision, second recess in the nozzle, recess in the face of the nozzle

43

head Start

44

Groove in nozzle

5

Moving contact, buffer cylinder (preferably in copper technology)

5a

Inner groove in the buffer cylinder

5b

Support surface on the buffer cylinder

5c

Phase to buffer cylinder wall

50

Buffer cylinder wall

51

Heating volume

52

Pre-compression volume

53

Bottom with valve flap

6th

Auxiliary nozzle

64

Heating duct

7th

Screw connection

8th

Mounting block

8a

Screw connection for mounting block

9

Clamping device, rotatable axial clamp fixation, ring segment, retaining ring, spring locking ring, Seeger ring

9a

Retention area

9b

Clamping surface

9c

Holes in the spring locking ring (Seeger ring)

91

First axial direction

92

Second axial direction

10

Protective ring, washer

11

Spring element, O-ring

12th

Clamping device, rotatable axial clamp fixation, ring segment, retaining ring, steel ring, spring locking ring, clip lock, snap lock

12a

Retention area

12b

Clamping surface

12c

second clamping surface

12d

second retention surface

13, 14

movable component

13th

Coupling element

13a

Inner groove in the coupling element

13b, 13c

first, second support surface on coupling element

14th

Kinematic connection, moving part, drive rod for auxiliary gear, movable shielding electrode

B1

Ring width of the Seeger ring

B2

Ring width of the snap lock

D1

Inside diameter of the insulating nozzle

D2

Outside diameter of the arcing contact pin

T1

Groove depth in buffer cylinder wall

T2

Inner groove depth in component

T3

External groove depth in insulating nozzle

Claims (13)

1. Interrupter unit for an electrical switching apparatus (1) for power supply systems, in particular high-voltage switch (1), the switching apparatus (1) having a central axis (1a) and at least one first contact part (2) with an insulating material nozzle (4) for blowing an arc and a second contact part (3), it being possible for at least one of the contact parts (2, 3) to be moved by virtue of a switch drive, a holding device for connecting the insulating material nozzle (4) to a component part (5; 13, 14), which can be moved by virtue of the switch drive, of the interrupter unit being provided, wherein, in addition, the holding device is a clamping device (9, 10, 11; 12), which produces a mechanical connection between the insulating material nozzle (4) and the component part (5; 13, 14) by virtue of a clamping hold (9, 5a, 5b, 5c; 12, 13a, 13b, 13c) and without a screw connection, wherein, in addition, the clamping device (9, 10, 11; 12) comprises a holding ring (9, 12), which is supported on the component part (5, 13) and which ensures fixing of the insulating material nozzle (4) with a precise alignment coaxially with respect to the central axis (1a), the holding ring (9, 12) fixing the insulating material nozzle (4) in the axial direction (91, 92) by virtue of clamping, and the holding ring (9, 12) having a restraining face (9a, 12a) for securing the insulating material nozzle (4) against sliding out in a first axial direction (91), characterized in that

   a) the component part (5) is a buffer cylinder (5) with a buffer cylinder wall (50), which has an internal groove (5a), and

   b) the clamping device (9, 10, 11) comprises a spring-securing ring (9), which fixes the insulating material nozzle (4) to the buffer cylinder (5) by means of engagement in the internal groove (5a) and by protruding radially inwards from the internal groove (5a) and transfers a switch drive force acting in the axial direction (91, 92) from the buffer cylinder (5) to the insulating material nozzle (4), and

   c) the clamping device (9, 10, 11) comprises an annular spring element (11), which can undergo a spring deflection in the axial direction (92) and is arranged between the spring-securing ring (9) and the insulating material nozzle (4).
2. Interrupter unit for an electrical switching apparatus (1) for power supply systems, in particular high-voltage switch (1), the switching apparatus (1) having a central axis (1a) and at least one first contact part (2) with an insulating material nozzle (4) for blowing an arc and a second contact part (3), it being possible for at least one of the contact parts (2, 3) to be moved by virtue of a switch drive, a holding device for connecting the insulating material nozzle (4) to a component part (5; 13, 14), which can be moved by virtue of the switch drive, of the interrupter unit being provided, wherein, in addition, the holding device is a clamping device (9, 10, 11; 12), which produces a mechanical connection between the insulating material nozzle (4) and the component part (5; 13, 14) by virtue of a clamping hold (9, 5a, 5b, 5c; 12, 13a, 13b, 13c) and without a screw connection, wherein, in addition, the clamping device (9, 10, 11; 12) comprises a holding ring (9, 12), which is supported on the component part (5, 13) and which ensures fixing of the insulating material nozzle (4) with a precise alignment coaxially with respect to the central axis (1a), the holding ring (9, 12) fixing the insulating material nozzle (4) in the axial direction (91, 92) by virtue of clamping, and the holding ring (9, 12) having a restraining face (9a, 12a) for securing the insulating material nozzle (4) against sliding out in a first axial direction (91), characterized in that

   a) the component part (5) is a buffer cylinder (5) with a buffer cylinder wall (50), which has an internal groove (5a), and

   b) the clamping device (9, 10, 11) comprises a spring-securing ring (9), which fixes the insulating material nozzle (4) to the buffer cylinder (5) by means of engagement in the internal groove (5a) and by protruding radially inwards from the internal groove (5a) and transfers a switch drive force acting in the axial direction (91, 92) from the buffer cylinder (5) to the insulating material nozzle (4),

   c) the buffer cylinder wall (50) being manufactured from a sheet or tube and having a wall thickness of less than 7 mm.
3. Interrupter unit according to Claim 1 or 2, characterized in that the clamping device (9, 10, 11; 12) and/or the insulating material nozzle (4) can rotate during fitting in relation to the component part (5, 13) about the central axis (1a).
4. Interrupter unit according to one of the preceding claims, characterized in that the clamping device (9, 10, 11; 12), in particular the holding ring (9, 12), has a clamping face (9b, 12b) for supporting the clamping device (9, 10, 11; 12) on the component part (5; 13, 14) in the first axial direction (91).
5. Interrupter unit according to one of the preceding claims, characterized in that

   a) the buffer cylinder wall (50) is manufactured from a sheet or tube, in particular a copper sheet or copper tube, and has a wall thickness of less than 5 mm, particularly preferably less than 3.5 mm, and/or

   b) the internal groove (5a) has an undercut depth (T₁) in a range of from 0.8 mm to 3.0 mm, preferably 1.0 mm to 2.0 mm, particularly preferably equal to 1.5 mm.
6. Interrupter unit according to one of the preceding claims, characterized in that

   a) the spring element (11) is arranged between the spring-securing ring (9) and the insulating material nozzle (4) in a recess (42) of the insulating material nozzle (4), and

   b) in particular in that the spring element (11) is an O ring (11), a helical spring, a wave spring or a disc spring for producing an axial spring force.
7. Interrupter unit according to Claim 6, characterized in that

   a) an annular protective element (10), preferably a washer (10), for mechanically and thermally protecting the spring element (11) and the insulating material nozzle (4) is provided between the spring-securing ring (9) and the spring element (11) and is supported on a dimensionally stable projection (43) of the insulating material nozzle (4), and

   b) in particular in that the protective element (10) is integrated in the clamping device (9, 10, 11), in particular in the spring-securing ring (9).
8. Interrupter unit according to one of the preceding claims, characterized in that

   a) the internal groove (5a) has a supporting face (5b) for interacting with the clamping face (9b) claimed in Claim 3, and/or

   b) the internal groove (5a) has a bevel (5c) for inserting the spring element (11) without damaging it.
9. Interrupter unit for an electrical switching apparatus (1) for power supply systems, in particular high-voltage switch (1), the switching apparatus (1) having a central axis (1a) and at least one first contact part (2) with an insulating material nozzle (4) for blowing an arc and a second contact part (3), it being possible for at least one of the contact parts (2, 3) to be moved by virtue of a switch drive, a holding device for connecting the insulating material nozzle (4) to a component part (5; 13, 14), which can be moved by virtue of the switch drive, of the interrupter unit being provided, wherein, in addition, the holding device is a clamping device (9, 10, 11; 12), which produces a mechanical connection between the insulating material nozzle (4) and the component part (5; 13, 14) by virtue of a clamping hold (9, 5a, 5b, 5c; 12, 13a, 13b, 13c) and without a screw connection, wherein, in addition, the clamping device (9, 10, 11; 12) comprises a holding ring (9, 12), which is supported on the component part (5, 13) and which ensures fixing of the insulating material nozzle (4) with a precise alignment coaxially with respect to the central axis (1a), the holding ring (9, 12) fixing the insulating material nozzle (4) in the axial direction (91, 92) by virtue of clamping, and the holding ring (9, 12) having a restraining face (9a, 12a) for securing the insulating material nozzle (4) against sliding out in a first axial direction (91), characterized in that

   a) the component part (13, 14) is a coupling element (13) for a moveable shielding electrode or for an auxiliary gear mechanism (14) of the switch drive,

   b) the coupling element (13) has an internal groove (13a), and the insulating material nozzle (4) has an external groove (44), and

   c) the clamping device (12) comprises a spring-securing ring (12), which at the same time engages in the internal groove (13a) and the external groove (44) in the manner of a snap-action closure.
10. Interrupter unit according to Claim 9, characterized in that

    a) the spring-securing ring (12) is a ring segment (12) having an arc length in the range of from 180° to 280°, preferably from 200° to 250°, particularly preferably of 230°, and/or

    b) the spring-securing ring (12) can be bent up and inserted into the external groove (44) radially from the outside, and/or

    c) the spring-securing ring (12) can be pressed completely into the external groove (44) when the component part (13, 14) is pushed on, and, in the pushed-on state of the component part (13, 14), can be latched into the internal groove (13a) by means of an elastic resetting force.
11. Electrical switching apparatus for a power supply system, in particular switching apparatus having a moveable insulating material nozzle (4) for blowing an arc, for example high-voltage switch, high-current switch or circuit breaker, characterized by an interrupter unit according to one of the preceding claims.
12. Electrical switching apparatus according to Claim 11, characterized in that

    a) the insulating material nozzle (4) is connected on both sides to in each case one moveable component part (5, 13, 14) by virtue of in each case one clamping device (9, 10, 11; 12), and

    b) the two clamping devices (9, 10, 11; 12) in each case produce an interlocking and force-fitting connection between the insulating material nozzle (4) and the associated component part (5, 13, 14) by virtue of a clamping hold (9, 5a, 5b, 5c; 12, 13a, 13b, 13c) and without a screw connection.
13. Electrical switching apparatus according to Claim 12, characterized in that the component parts (5, 13, 14) are a moveable buffer cylinder (5) and a coupling element (13) for a part (14) to be driven, in particular a shielding electrode or an auxiliary gear mechanism, of the interrupter unit.

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