CH654138A5 - HIGH VOLTAGE CIRCUIT BREAKERS. - Google Patents

Description

The invention relates to a high voltage power. Switch according to the preamble of claim 1.

When such a switch is switched on, a switch-off spring is also tensioned, which, via the push rod, can switch the switch off once.

This switch-off spring must be strong enough so that it can do all the work required when switching it off. It usually acts on the push rod, so that the intermediate lever and the drive lever must be dimensioned accordingly to absorb the forces. The intermediate lever creates a shear force component at its point of application on the push rod. This lateral force must be absorbed to guide the push rod in a straight line. For this purpose, in CH-PS 238 044 and DE-OS 2 545 479 a longitudinal guide located between the point of engagement of the intermediate lever and the switch contacts has been provided, which entails a certain free length of the push rod. The greater this free length, the more effective the lateral forces. The free length should therefore be kept as short as possible. The best way to achieve this with a longitudinal sliding guide is through a very long guideway, such as e.g. is provided in CH-PS 218 202 (but without a strap). In addition to the disadvantage of space requirements, the cost and precision problems, such guideways also have the disadvantage of high frictional losses, which is also added to the CH-PS 218 202 by the disadvantage of frictional losses at the slot-bolt connection between the drive lever and the push rod. According to CH-PS 368 535, the transverse forces at the point of application of the intermediate lever on the push rod were supported on the housing by extending the intermediate lever via its connection point with the drive lever from the push rod, and the end obtained by the extension in a transverse slot of the Supported housing. This creates frictional forces in the slot and the extended intermediate lever must be very strong so that it can take over the bending stress. The slot construction is also not easy. This makes the whole thing expensive, heavy and big.

The invention has for its object to provide a high-voltage circuit breaker of the type mentioned, which avoids the disadvantages of the known designs and is economically advantageous.

To solve this problem, a high-voltage circuit breaker according to claim 1 is proposed.

All joints are simple, low-friction and precise, and the intermediate lever intermediate bearing describes a straight path that is so closely approximated when switching that a simple o-ring seal with millimeter play can be used to seal the push rod.

The intermediate lever intermediate bearing is advantageous for auxiliary. lever offset relative to the intermediate lever end bearings, so that the forces acting on the drive lever can be minimized by a favorable lever ratio. The intermediate lever can be made short and rigid, without having to accept the known disadvantages.

Due to the fact that the forces acting on the drive lever can be minimized, an advantageously provided lock, which holds the drive lever in the on position counteracting the switch-off spring, can be produced in a relatively simple and easily releasable manner.

It is thus possible to produce a straight guide of the push rod free of sliding pieces, with an effect on the point of engagement (intermediate joint) of the intermediate lever in an economical manner and to achieve further advantages without risking the known disadvantages.

The invention is discussed below, for example, using the purely schematic drawing. Show it:

Fig. 1 is a partially broken side view of the erfin5

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654 138

essential parts of a high-voltage circuit breaker in the on position, and

Fig. 2 is a lever-gear scheme of another embodiment of the invention.

The housing 1 (FIG. 1) consists, in a manner known per se, of a large number of parts which are only partially shown. The moving contact 2 is also only referred to in general. This contact 2 is actuated via the push rod 3, it being possible for part of this push rod 3 to be made of insulating material. An extension 30 of the push rod 3 acts on the switch-off spring 31, which is tensioned here in FIG. 1.

A drive shaft 40 is inserted into the housing 1 from the outside. On the drive shaft 40, a drive lever 4 is non-rotatably, which is held in position by the pawl 41 against the spring 31. The pawl 41 can be triggered by electromechanical means, not shown, if the switch is to be switched off under the action of the spring 31.

The drive lever 4 is connected to the intermediate lever 5 via one end joint 50, while the other end joint 51 of this intermediate lever 5 is connected to an auxiliary lever 6 which is supported in the housing joint 60 on the housing 1. The intermediate lever 5 is connected to the push rod 3 by an intermediate joint 52. All joints 50, 51, 52 and 60 are axially parallel to the drive shaft; 40. The intermediate joint 52 practically moves on a straight line. The tolerance is so narrow that an O-ring 7 is sufficient as a seal between the housing 1 and the push rod 3. The intermediate joint 52 is offset from the connecting straight line of the two end joints 50, 51 of the intermediate lever 5 by V to the housing joint 60, which in the drawn on position can bring about a favorable, low supporting torque on the pawl 41. The offset Y of the housing joint 60 relative to the drive shaft 40 measured in the direction of the push rod 3 is smaller than the stroke H of the push rod 3. The length RT of the drive lever 4 is here somewhat less than the length RH of the auxiliary lever 6, which together with the mentioned offset V of the intermediate joint 52 has a favorable effect on the described support torque in the on position. The distance 2R of the end joints 50, 51 from one another is also advantageously smaller than the drive lever length RT. The described offset V should be less than half the length 2R of the intermediate lever 5, as a result of which a favorable path and favorable dimensioning ratios of the lever can be achieved.

2 shows a lever drive in which the offset V of the intermediate bearing 52 of the intermediate lever 5 of FIG. 1 is not carried out. But in order to obtain a support element that is as good as possible in the solid position, here the angle A between the dash-dotted off position of the drive lever 4 'and a vertical plane E to the push rod 3' is smaller than the angle B between the mentioned level È and the extended. -represented-15 th on position. The lever mechanism according to FIG. 2 has a drive shaft 40 ′, which is inserted into the housing (not shown) and has the drive lever 4 ′ (with a length RT ′) seated thereon in a rotationally fixed manner. The drive lever 4 'is connected by the joint 50' to the intermediate lever 5 ', which has a length of 2R' 2o and, in the middle, carries an intermediate joint 52 'which connects it to the push rod 3'. At the other end of the intermediate lever 5 'there is a joint 51' which connects it to the auxiliary lever 6 ', which in turn is mounted in the housing joint 60' on the housing, not shown. All joints 25 50 ', 51', 52 'and 60' are axially parallel to the drive shaft 40 '.

While the drive lever length RT 'corresponds to the auxiliary lever length RH' here, the intermediate lever length 2R 'has been chosen shorter than the drive lever length RT'. The distance D 'between the drive shaft 40' and the housing joint 60 'is less than 30 than the sum RT' + RH 'of the drive lever length RT' with the auxiliary lever length RH '. The offset Y 'in the direction of the push rod 3' between the drive shaft 40 'and the housing joint 60' is smaller than the stroke H 'of the push rod 3'. So essentially only the already mentioned differences of the constructions of FIGS. 1 and 2 result, whereby the construction of FIG. 1 is currently preferred, since it combines all advantages in an economical way.

1 sheet of drawings

Claims (11)

654 138 1.High-voltage circuit breaker with a housing containing an extinguishing agent, into which a drive shaft carrying a drive lever is inserted and in which an intermediate lever is provided, which is connected to the drive lever and to an axially displaceable push rod actuating a movable thrust contact by joints which are parallel to the drive shaft is articulated on the housing, characterized in that the intermediate lever (5; 5 ') each has one of two end joints (50, 51; 50', 51 ') with the drive lever (4; 4') and one on a housing joint (60; 60 ') mounted auxiliary lever (6; 6') and an intermediate joint (52; 52 ') arranged between its end joints (50, 51; 50', 51 ') is connected to the push rod (3; 3'), wherein the auxiliary lever-housed sail joint (60; 60 ') on the side of the push rod (3; 3') facing away from the drive shaft (3; 3 ') is arranged offset in the push rod direction to the drive shaft (40; 40'). 2. High-voltage circuit breaker according to claim 1, characterized in that the offset (Y; Y ') in the push rod direction of said housing joint (60; 60') to the drive shaft (40; 40 ') is smaller than the stroke (H; H' ) of the push rod (3; 3 '). 2nd PATENT CLAIMS 3. High-voltage circuit breaker according to claim I or 2, characterized in that the drive shaft (40; 40 ') and the auxiliary lever housing joint (60; 60') from each other have a distance (D; D ') which is greater than that Stroke (H; H ') of the push rod (3; 3') between the on and the off position of the switch. 4. High-voltage circuit breaker according to claim 3, characterized in that the ratio (D: H; D ': H') of said distance (D; D ') to said stroke (H; H') in the range of 1.5 up to 2.5. 5. High-voltage circuit breaker according to one of claims 1 to 4, characterized in that the drive shaft (40; 40 ') and the auxiliary lever housing joint (60; 60') are arranged at a distance (D; D ') from each other is smaller than the sum of the lever lengths (RT + RH or RT '+ RH') of the drive lever (4; 4 ') and the auxiliary lever (6; 6'). 6. High-voltage circuit breaker according to claim 5, characterized in that said distance (D; D ') is greater than 95% of said lever length sum (RT + RH or RT' + RH '). 7. High-voltage circuit breaker according to one of claims 1 to 6, characterized in that the drive lever length (RT; RT ') is at least equal to the intermediate lever length (2R; 2R') and at most twice as large. 8. High-voltage circuit breaker according to one of claims 1 to 7, characterized in that the angle (A, Fig. 2) between the off position of the drive lever (4 ') and a to the push rod (3') vertical plane (E) is equal to or smaller than the angle (B) between this plane (E) and the setting of the drive lever (4 '). 9. High-voltage power switch according to one of claims 1 to 8, characterized in that the intermediate joint (52) of the intermediate lever (5) relative to the connecting straight line of the intermediate lever end joints (50, 51) to the auxiliary lever (6) is laterally offset . 10. High-voltage circuit breaker according to claim 9, characterized in that the lateral offset (V) of the intermediate joint (52) is less than half the distance (R) of the end joints (50, 51) of the intermediate lever (5). 11. High-voltage circuit breaker according to one of claims 1 to 10, characterized in that the drive lever (4r 4 ') is approximately the same length to slightly shorter than the auxiliary lever (6; 6').