MXPA99001167A - High voltage or high voltage circuiter that comprises a closed transmission belt around finger punishment - Google Patents

Abstract

A medium or high voltage circuit breaker is described which comprises, in an enclosure, a first (1) and a second (2) movable main contacts, one in relation to the other, according to an axial direction (L), a first (3) and a second (4) mobile arc contacts, according to the axial direction, the first arc contact (3) is joined to the first main contact (1) and a means for transmitting a sense shift to the second arc contact (4). opposite (BETA) to the displacement (ALPHA) of the first main contacts (1) and of the arc (3). This means comprises two pinions (7, 9) mounted fixed on the circuit breaker and which are aligned according to the axial direction (L) and a transmission belt (11) closed on itself around the two pinions (7, 9), which allows to move the second arc contact (4) in relation to the first contacts (1, 3) with a reduced obstruction

Description

HALF OR HIGH VOLTAGE CIRCUITER THAT COMPRISES A BELT CLOSED TRANSMISSION AROUND TWO SPROCKETS Description of the invention The invention is concerned with a medium or high voltage circuit breaker comprising, in an enclosure, first and second main contacts movable one in relation to the other in an axial direction, a first and second arc contacts movable in an axial direction, the first arc contact is connected to the first main contact and a means for transmitting to the second arc contact a displacement opposite to the displacement of the first main and arcing contacts. One such circuit breaker is known in particular from the European patent application EP 0 313 813 published on May 3, 1989. The first main and arc contacts are joined in a first rack which cooperates with a fixed mounted gear wheel in the circuit breaker and mobile in rotation, about an axis perpendicular to the axial direction. The second arc contact is formed of a rod in which a second rack is inserted which is connected to the gear wheel at a contact point diametrically opposite the point of contact of the first rack. During the opening of the circuit breaker, a conventional drive means entrains the first main and arc contacts in the axial direction in a direction in which the first main contact is REF. 29442 separates from the second main contact that is fixed in the circuit breaker. The second arc contact is simultaneously displaced in the opposite direction by means of two racks and the gear to be separated from the first arc contact. It is also contemplated to unfold the toothed wheel and the two preceding racks and arrange them in both parts of the axial direction to distribute in a balanced manner the efforts of transmission of these elements during the opening of the circuit breaker. The toothed wheels and the racks that allow to transmit to the second arc contact a displacement of opposite direction to the displacement of the first main contacts and of the arc are arranged inside the second main contact that is cylindrical and present a problem of obstruction or hindrance. The use of the "wheels and racks" is also relatively expensive, taking into account the realization of the gear teeth of these elements The object of the invention is to reduce the obstruction or hindrance of the circuit breaker and to reduce its cost of realization. The object of the invention is a medium or high voltage circuit breaker, comprising, in a housing, first and second main contacts movable relative to each other in an axial direction, first and second mobile arcing contacts according to the invention. the axial direction, the first arcing contact is connected to the first main contact and a means for transmitting to the second arc contact a displacement of opposite direction of the displacement of the first main and arcing contacts, characterized in that this means comprises two fixed mounted pinions on the circuit breaker and they are aligned according to the axial direction and a closed transmission belt on Re itself around the two pine nuts. The two pinions aligned according to the axial direction of the circuit breaker and around which the drive belt is mounted closed, allow to move the second arc contact in relation to the first contacts with a reduced obstruction and constitute elements that are less expensive to perform than the zippers. The use of a closed transmission chain in the two pinions or a closed cable in two pulleys is also provided. Other features and advantages of the invention will appear on reading the description of two embodiments of the invention illustrated by the drawings / Figures 1 and 1B show a longitudinal section of a circuit breaker according to a first embodiment of the invention respectively in the closed position and in the open position.

Figures 2a and 2b show in longitudinal section a circuit breaker according to a second embodiment of the invention respectively in the closed position and in the open position. A medium or high voltage circuit breaker comprises, FIGS. 1 and 2, a first 1 and a second 2 main contacts which extend coaxially in an axial direction L into an enclosure not shown and which are movable in this direction. The second main contact 2, figures la and 2a, comprises two contacting hands 2A which form a crown by exerting a contact pressure on a part IA of the first main contact 1. When the circuit breaker is closed, the passage of a permanent current between the two main contacts 1 and 2 are secured by a fixed and cylindrical part 5 extending parallel to the axial direction L and to the interior of which the second main contact 2 slides by means of a sliding contact 5A. The circuit breaker also comprises, FIGS. 1 and 2, a first 3 and a second 4 arc contacts. The first arc contact 3 is in the form of a hollow cylinder arranged parallel to the axial direction L and is movable in translation parallel to this direction and is joined to the first main contact 1. The second arc contact 4 is in the form of a rod arranged according to the direction L of the circuit breaker and is movable according to the axial direction L when it is connected to the second main contact 2. The first arc contact 3 comprises contact handles 3A forming a crown exerting a contact pressure on the rod of the second arc contact 4 to allow the passage of a transient current during an opening phase of the circuit breaker after a separation of the main contacts 1 and 2. According to the invention, two pinions 7 and 9 are mounted fixed on the circuit breaker and are aligned according to the axial direction L. These two pinions are mobile in rotation around respectively two axes Rl and R2 perpendicular to the direction n axial L. A drive belt 11 is mounted around the two closed sprockets 7 and 9 which are disposed above the fixed piece 5 and cylindrical without requiring an increase in its diameter. According to a first embodiment of the invention, figures la and lb, the second main contact 2 is connected to the transmission belt 11 by the inclination of a lower jaw 2B and the first main contact 1, is connected to the belt of transmission 11 by tilting an upper jaw IB. This upper jaw IB is fixed to one end of a semitube 17 which is connected to the first main contact 1 by means of a blowing tube 19. By lower jaw 2B and upper jaw IB, it is understood respectively a jaw that is connected to a first rectilinear section 111 of the transmission belt 11 disposed on a first side of the axial direction L and a jaw that is connected with a second rectilinear section US of the transmission current 11 disposed of a second symmetrical side of the first side in relation to the axial direction L. To open the circuit breaker, the first main contact 1 is moved in the direction indicated by the arrow ALPHA in FIG. Ib, by means of a conventional drive not shown. The translation movement of the first main contact 1 is transmitted by the transmission belt 11 and the upper and lower jaws IB and 2B, to the second main contact 2 moving simultaneously in the opposite direction to the first main contact 1, indicated by BETA in the figure Ib, to interrupt the passage of permanent current. The first and second arc contacts 3 and 4, respectively, connected to the first main contact 1 and the second main contact 2 are dragged in displacement respectively in the two opposite directions ALPHA and BETA to separate subsequently to the separation of the two main contacts 1 and 2 and to interrupt the passage of transient current. According to a second embodiment of the invention, figures 2a and 2b, the first main contact 1 is connected to the transmission belt 11 by the inclination of a first link 13 where one end is hinged to the semi pipe 17 connected to the blow pipe 19 and the second main contact 2 is connected with the transmission belt 11 by tilting a second link 15. The attachment of the links 13 and 15 to the transmission belt 11 is ensured by two cylindrical ball joints ÍC and 2C to allow a rotation movement of these linkage in a plane perpendicular to the axes of rotation Rl and R2 of the two pinions 7 and 9. To open the circuit breaker, the first main contact 1 is moved in the direction indicated by the arrow ALPHA in figure 2b, by means of a classical drive not shown . The translation movement of the first main contact 1 is transmitted by the transmission belt 11 and the rods 15 and 13 to the second main contact 2 which moves in the opposite direction to the first main contact 1, indicated by BETA in figure 2b, to interrupt the permanent current passage. The first and second arc contacts 3 and 4 respectively, joined to the first main contact 1 and the second main contact 2 are dragged in displacement respectively in the two opposite directions ALPHA and BETA to separate subsequent to the separation of the two main contacts 1 and 2 and to interrupt the passage of the transient current.

In this second embodiment of the invention, it is advantageous to fix the cylindrical ball joints 1C and 2C on the transmission belt 11 at a distance from each other in such a way that the cylindrical ball joint ÍC of the first link 13 pulls the transmission belt 11 to the perform a translation course between the two pinions 7 and 9 and simultaneously the cylindrical ball joint 2C of the second link 15 is driven by the transmission belt 11 when performing a semicircular course of rotation about a pinion 7, then a course of transmission between the two pinions 7 and 9. When the cylindrical ball joint 2C of the second link 15 performs a semicircular course of rotation about a pinion 7, the second main contacts 2 and arc do not move practically, which confers on the circuit breaker a degree of freedom to adjust. the synchronization of the subsequent separation of the arc contacts in relation to the separation of the main contacts. It is noted that, in relation to this date, the best method known by the applicant to carry out the aforementioned invention is the conventional one for the manufacture of the objects to which it relates.

Claims (5)

Claims Having described the invention as above, property is claimed as contained in the following:

1. A medium or high voltage circuit breaker, comprising a first set of contacts and a second set of contacts movable one in relation to the other according to an axial direction and a means for transmitting, to the second set of contacts, a displacement of opposite direction to the displacement of the first set of contacts, characterized in that the means comprises two pinions aligned in the axial direction and mounted in rotation about two respective axes, fixed perpendicular to the axial direction, a transmission belt closed on itself around the two pinions for defining two straight belt sections, the first set of contacts is joined in motion to one of the two belt sections and the second set of contacts is joined in motion to the other section of the belt. A circuit breaker according to claim 1, characterized in that each set of contacts is connected in motion to a belt section by means of a clamp connected to the set of contacts and connected to the belt section. A circuit breaker according to claim 1, characterized in that each set of contacts is connected in movement to a belt section by a connecting rod, wherein one end is fixed to the set of contacts and the other end is fixed to a section of strap by means of a kneecap. 4. A circuit breaker according to any of claims 1 to 3, characterized in that the drive belt is a chain. A circuit breaker according to one of claims 1 to 3, characterized in that the pinions are two pulleys and the drive belt is a cable.