The present invention relates to an electric current switching apparatus, like switches or load switch-disconnectors.
Many issues affect designing of an electric current switching apparatus. The design goals include, for instance, less complex structure, ease of assembly of the switch, possibility to assemble various switch types, security of use the switch, fast connecting and disconnecting of the contacts and efficient quenching of an arc when the switch was opened.
An object of the present invention is to provide an improved electric current switch. The object is achieved with an invention, which is defined in the independent claim. Some embodiments are disclosed in the dependent claims.
In the following, the invention will be described in greater detail by means of some embodiments with reference to the accompanying drawings, in which
An electric switch may comprise a mechanism module and a contact module with plurality of poles to build a multi-pole switch. Modules may comprise an insulating housing, which accommodates the mechanical or electrical components of the switch. Each module housing may be made of plastic, for instance. The housing modules may be substantially rectangular shaped.
The mechanism module (2) comprises a set of main operating elements (8). One of the main operating elements, a front pipeshaft (9) is received and supported by an aperture (10) of the cover element (6). A rhytm piece (11) may be fixed movable, preferably slideably on the base module (5).
A front pipeshaft (9) may have along its rotational axis preferably a square shaped aperture (15) for receiving a shaft of a handle (not shown) for operating the switch from the front side. An inner pipeshaft (12) may have along its rotational axis preferably a square shaped aperture (16) for receiving a shaft of a handle (not shown) for directly operating the switch (1) from the end side.
A lever (13) receives the inner pipeshaft (12) to be rotationally turned by the inner pipeshaft (12) for compressing main springs (14) to give energy for closing or opening operation of the switch (1). The first end (49) of the main spring (14) is connected to the base element (5) and the second end (50) being connected to the lever (13).
An inner pipeshaft (12) has first end (21) and second end (23), and may have preferably a square shaped aperture (16) on the first end (21) along the axis of rotation for receiving a shaft of a handle (not shown) for directly operating the switch from the end side. The inner pipeshaft (12) comprises teeth (22) at the second end (23) for cooperating with the teeth (19) of the front pipeshaft (9), constituting a gear for transferring a vertical mechanical rotating power from the front pipeshaft (9) to the inner pipeshaft (12). The inner pipeshaft (12) is received and the second end (23) is supported by an aperture (28) of the lever (13). The inner pipeshaft (12) comprises sector shaped legs (24) on the first end (21) for cooperation with slots (31) of the lever (13) and the inner pipeshaft (12) comprises sector shaped slots (35) on the second end (23) for cooperation with legs (29) on the lever. The legs (24,29) and slots (31,35) connect the rotational moment between the inner pipeshaft (12) and the lever (13), but still having an operational clearance by having different circle length for slots and legs. The inner pipeshaft (12) comprises a leg (26) for cooperating with a rhytm piece (11) for ensuring a stable positioning of the handle at “O” or “I” positions.
A rhytm piece (11) is preferably a rectangular shaped piece of plastic with a nose for cooperating with the leg (26) of the inner pipeshaft (12). The rhytm piece (11) may be arranged to move linearly in a slot of the base element (5), being pressed by a spring, the nose against the surface of the inner shaft (12) for ensuring a stable positioning of the handle on the “O” or “I” positions.
The lever (13) comprises a round shaped first end (27) and second end (30) received and rotatable supported by apertures formed on both side walls of the mechanism module (2). The lever (13) comprises at least one bracket (33) for receiving second end (50) of the main spring (14). For better effectivity and less friction, the lever (13) may have a second spring bracket (33) for receiving the second end (50) of a second main spring (14). The first end (27) of the lever comprises sector shaped slots (31) for cooperation with legs (24) and the second end (30) comprises sector shaped legs (29) for transferring the rotational moment between the inner pipeshaft (12) and the lever (13). End (27, 30) of the lever (13) comprises slots (32) for cooperation with contact module to transfer the rotational moment from the mechanism module (2) to the contact module (3).
The main components (8) may preferably be manufactured of plastic, except the main springs (14).
Functional description of the switch during an operation from open “O” position to closed “I” position.
Full operating angle of the handle connected to the front pipeshaft (9) or to the inner pipeshaft (12) is 90 degree from “O” to “I” position.
The inner pipeshaft (9) has 20 degree cap to lever (13). The lever (13) has 70 degree operation angle.
While the inner pipeshaft (12) has been rotated 55 degrees, the lever (13) has turned 35 degrees and the main springs (14) are compressed reaching a dead center angle and the main springs (14) force is on their maximum level. Turned a little bit over the dead center angle, the main springs (14) will rotate the lever (13) for 35 degrees more to reach the “I” position. Lever (13) will start moving the roll (3) after the inner pipeshaft (12) have been operated 30 degrees. The lever (13) will force the roll to rotate 60 degrees and close the moving contacts (40) at the same time against to the fixed contacts (41). Over rotating has been limited with stoppers for the following components, the front pipeshaft (9), lever (13) and the roll (39).
Functional description of the switch during an operation from closed “I” position to open “O” position.
While the inner pipeshaft (12) has been rotated 55 degrees to direction of “O” position, the lever (13) has rotated 35 degrees and reached dead center angle and also the main springs (14) force is on their maximum level. Turned a little bit more, over the dead center angle the main springs (14) will rotate the lever (13) 35 degrees more to reach the “O” position. The lever (13) will start to move the roll (39) after the inner pipeshaft (12) has been rotated 40 degrees; at the same time the roll (39) will start to open knife contacts slowly 15 degrees until the lever (13) reach the dead center angle and force contacts opened quickly. Until reached dead center angle, the moving contacts (40) are still be electrically connected to the fixed contacts (41). Between the lever (13) and the roll (39), the spring (45) will allow lever turn from 5 to 15, preferably 10 degrees more than in “O” to “I” operation before starting to rotate the roll (39). This spring will also hold the roll (39) on full “O” position by removing the 10 degrees cap between the lever (13) and the roll (39). Over rotating has been limited with stoppers in all following components, the front pipeshaft (9), the lever (13) and the roll (39).
Filing Document | Filing Date | Country | Kind |
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PCT/CN15/76429 | 4/13/2015 | WO | 00 |