Switch automatic

 

(57) Abstract:

Usage: in electrical engineering, namely, circuit breakers for conducting current in normal mode and the current is switched off at short circuits and overloads. The inventive switch comprises an insulating housing consisting of a cover and base, has in each pole fixed contacts, movable contacts on contacttitle rigidly interconnected for rotation on a common insulating shaft, at least one maximum trip current, the mechanism of a free trip, interrupter chamber. The fixed contact is made in the form of a loop with an insulating gasket between its branches and has a groove along the longitudinal axis with the location it stiffeners case base, and the casing wall composed of inner and outer rings, each using external cheeks more heat resistant material than the inner. 1 C.p. f-crystals, 5 Il.

The invention relates to electrical engineering, and in particular to circuit breakers for conducting current in normal mode and the current is switched off at short circuits and overloads.

Known automatic switch (patent RF N inou camera with insulating partition with apertures, adjacent to the output of the interrupter chamber, the tripping mechanism and electromagnetic release current.

The drawback of such switches is that not provided sufficient retraction speed of the arc formed by the short circuit currents (hereinafter CC).

Known also switch automatically (and.with. USSR N 922910, IPC H 01 H 73/48) containing insulating housing consisting of a base and cover, each pole of the fixed contacts secured on the base, and movable contacts on contacttitle rigidly interconnected insulating crossmember and installed on a fixed axis for rotation, the maximum trip current, the mechanism of a free trip, interrupter chamber (prototype).

This switch also does not provide sufficient speed of retraction of the arc formed by the short circuit currents, do not provide sufficient heat interrupter chamber when the short circuit currents, which leads to the need to increase the dimensions of the arc chamber to prevent its destruction.

The technical purpose of this invention is the ceteris equivalent signs in relation to the prototype of the device, to increase the heat capacity of the automatic switch, and to allow its repeated use after working in the mode of short circuit currents.

The specified technical task is solved by the fact that the automatic switch containing insulating housing consisting of a base and cover, each pole of the fixed contacts secured on the base, the movable contacts on contacttitle rigidly interconnected by means of the brackets on the insulating shaft for rotation, at least one maximum release current freewheel release containing the handle, at least one spring and lever system in the form of a gear-lever mechanism connected with contacttitle and associated with the maximum release current interrupter chamber, installed in each pole of the switch and comprising a housing of insulating material and deionno lattice in the form of plates, insulator movable contact system, stationary contacts made in the form of a loop with an insulating gasket between the branches having a groove along its longitudinal axis located in its ribs the base of the casing, and the casing wall interrupter chamber social, than internal, and each arc chamber has a perforated estrogenically plate: external - metal, and the interior of insulating material, in addition, the insulator separating the stationary contact system from the movable contact, the box-shaped design with labyrinth groove around the perimeter and fastened to the base body.

It is the fulfillment of the fixed contact in the form of a loop with an insulating gasket between the branches, with a groove along the longitudinal axis and the location therein of the ribs of the case base provides the acceleration of the process of retracting the arc interrupter bars.

The implementation of the walls of the interrupter chamber housing of a pair of outer and inner cheeks each using external cheeks more heat resistant material than the internal and the external perforated estrogenically plates of metal, and the interior of the insulating material increases thermal resistance of the interrupter chamber, preventing it from burning out when the short circuit currents.

In Fig. 1 shows a General view in the context of automatic switch of Fig. 2 is a side view of the fixed contact of Fig. 3 - vía and the movable contact; in Fig. 5 is a top view of Fig. 2.

The automatic switch has an insulating housing consisting of a base 1 and cover 2, interconnected, for example, screws. Based on 1 mounted all the parts of the switch. The base 1 and cover 2 are inside the partition separating from each other, each pole of the switch is automatic.

The automatic switch has a movable contact system consisting of three movable contacts 3, contacttitle 4, the brackets 7, the spring 8, the upper cap of the spring 9 and the bottom of the cap 10, the adjusting screw 12 and the insulating shaft 13 connecting all three contacts with staples 14.

The mechanism of a free trip consists of two curved cheeks 15, fixed to the base 1, the axis of rotation 16 of the movable contact system. Figure cheeks 15 is connected between the roller 17 and the roller 18. Figure cheeks have 15 on the inner two sides of a stud 19, which is the axis of rotation of the element 20 together with placed on it by the handle 21.

The axis of the pin 6 when the lever 21 is experiencing a force from the four main springs 22, forcing to move kontaktdaten 4, and with it the movable contact 3 through the rod 23, the United States is each of the two plates 24 attached on the two main springs 22.

On the axis 25 are, in addition, two stops 26, the grooves are hosting the roller 27 of the lever 28. The lever 28 has an axis of rotation 29, placed in curly cheeks 15, and spike 30 walking around in the notch of the pawl 31. The tail of the pawl 32 can engage with the axis 33 of the rails 34, rotating in the slots curly cheeks 15.

In each pole of the switch has automatic fixed contact 35 in the form of a loop, located in the special grooves of the base 1 and is attached to the base 1 by means of screws 36.

The base 1 and cover 2 are inside the septum (not shown) to separate from each other, each contact pair (movable contact 3 and the fixed 35).

The previously described system of levers freewheel release in the form of a gear-lever mechanism connected with contacttitle 4, associated with the maximum thermal and electromagnetic tripping current.

Thermal magnetic trip current consists of thermobimetallic plate 37 welded with shunt 38 (razdaivaniya path of current flow) and attached to the base 1 by a screw 39.

Electromagnetic maximum release current consists of the element 41, the armature 42 with the rod 43, a spring 44, adjustable wut is the breaker and are deione lattice in the form of plates 48 (steel), obliquely mounted in the housing of arc-quenching chamber, which consists of a pair of inner jaws 49, made of fibre electrical engineering, and a pair of outer jaws 50 of fiberglass, and the external plates 50 have a greater resistance (by selecting the corresponding material) than the inner edges 49. Internal edges 49 contribute to the extinguishing of the arc, the outer edges 50 are used for giving a spatial stiffness. Between us formed an air threshold that ensures the safety of work interrupter chamber, without increasing its size. In addition, the arc chamber contains a perforated estrogenically plate 51 (electrical fibre) and perforated estrogenically plate 52 (steel) located at the exit of gases from the housing of the automatic switch, perforated estrogenically plate 52 from above.

In the stationary contact 35 is provided by an insulating strip 53 of fiberglass, so as not to short-circuit the loop 54 of the fixed contact 35, which is a copper plate 55, curved space, with the loop 54 with a silver brazing 56 in contact with a movable contact 3.

Fixed kotlicki wires of the main circuit (Fig. not shown).

On the longitudinal axis of the stationary contact 35 includes a groove 59, intended for the location therein of the ribs 60 of the base 1, providing compactness and durability of the device. The groove 59 holds stiffening rib 60 of the base 1 provides the current passing through the stationary contact 35 and, as a consequence, the reduction of the variation of the magnitude of the current operation of the whole circuit, leads to a better centering of the electric arc. In addition, the placement of the groove 59 in the ribs 60 of the base 1 provides rigid fixation of the fixed contact 35.

For a more rigid connection elements interrupter chamber with each other plate 48 provided with projections 61 which are provided for insertion into the slots 62 of the internal and external jaws 49, 50 and subsequent reversal (for example, using special tool) that provides rigidity even when blasting processes (when short circuit currents).

Deione lattice contribute to the retraction of the arc between the movable and stationary contacts 3 and 35 respectively inside and the arc is extinguished. But at high currents (currents short circuit) this process is stretched in time and broken the resistance of the structure, leading to its destruction. For obede this A bending direction of current I is opposite to the direction of the currents in the movable contact 3.

To ensure isolation of the fixed contact 35 with the movable contact system at the occurrence of the arc and to increase road surface breakdown of the insulator in the design provides a box-shaped labyrinth isolator 63 with a groove around the perimeter, which is made of insulating material (for example, MFE) and attached to the chassis (ground 1).

The automatic switch operates as follows.

To activate the automatic switch, which was in rosapenna position (position "Deactivated"), a mechanism must be cocked by moving the arm 21 of the switch in the direction of the character "0" (not shown) until it stops. The system of levers formed of the described items when moving the arm 21 until it stops at the "0" position causes the pawl 31 is engaged with the axis 33, permanently locking the cleat 30 of the lever 28 in the groove of the pawl 31.

Subsequent switching on the switching arm 21 in the direction of the sign "1" until it stops.

Previous transfer arm 21 to "0" allows the transfer arm to position "1" to redistribute the load of the main spring 22 with the stops 26, rotating around nebody the mswb 3 with respect to contacttitle 4.

Automatic shut-off switch automatically achieved by turning the slats 34 in any of the maximum release regardless of the position of the arm 21 of the switch when the handle occupies an intermediate position between the symbol "0" and "1", indicating that the switch is turned off automatically.

This happens as follows. The rail 34 is rotated, the tail 32 of the pawl 31 slides axis 33, the roller 27 ceases to be stationary, the stop 26 is moved, the movable contacts 3 are opened.

The switch automatically in normal mode long-conducts current in the protected circuit (stationary contact 35, the movable contact 3, the flexible joint 5, the shunt 38, area 46, the output 47).

If the protected circuit at least one pole of the current reaches a value equal to or greater than the setpoint triggering current maximum tripping current in the zone of overcurrent or short circuit currents, triggered corresponding to the maximum of the release, and the switch automatically disables the protected circuit.

Heat release protects against overload currents. During the passage of current in case of overload the bimetallic strip 37 is heated and its si mechanism unlinked.

Electromagnetic release performs the function of instantaneous protection against short circuit. With the passage of currents exceeding a certain value "Setpoint", the anchor 42 is seeking to close the magnetic coil (armature-core). When the rod 43 of the armature 42 rotates the rail 34 and unhooks the mechanism.

When opening, movable contact 3 and the fixed contact 36 under tension between them, an electric arc, which is involved inside deionno grating formed by the plates 48.

When the extinction of the arc and the burning gases are blown through the exit through estrogenically plates 51 and 52.

Thus, the proposed switch automatically compared with the prototype provides centering and intensive involvement of an electric arc in deionno grid-mode short-circuit currents; ensures durability of the device when the switch is automatic in critical conditions; provides isolation of the fixed contact 35 of the movable contact system in critical conditions.

1. Switch auto-containing insulating housing consisting of a base and cover, each pole of the fixed contacts secured on the base, under the rotatably, at least one maximum release current freewheel release containing the handle, at least one main spring and lever system in the form of a gear-lever mechanism connected with contacttitle associated with the maximum breakers, arc cameras installed in each pole of the switch and comprising a housing of insulating material and deionno lattice in the form of plates, insulator movable contact system, wherein the fixed contact is made in the form of a loop with an insulating gasket between the branches having a groove along its longitudinal axis located in its ribs enclosure base, and the casing wall interrupter chamber consist of a pair of inner and outer rings each, and for external cheeks used more heat resistant material than the inner, and each arc chamber has a perforated estrogenically plate external - metal, and the inside is made of insulating material.

2. Switch on p. 1, characterized in that the insulator separating the stationary contact system from the movable contact, the box-shaped design with labyrinth groove on the Sabbath.

 

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