WO2005059940A1

WO2005059940A1 - Circuit breaker

Info

Publication number: WO2005059940A1
Application number: PCT/RU2003/000590
Authority: WO
Inventors: Andrei Georgievich Kosolapov; Vladimir Evgenyevich Shmoylov
Original assignee: Andrei Georgievich Kosolapov; Vladimir Evgenyevich Shmoylov
Priority date: 2003-12-19
Filing date: 2003-12-29
Publication date: 2005-06-30
Also published as: AU2003303739A1

Abstract

The essence of this invention is as follows: the circuit breaker comprises a contact system placed in a body, consisting of two half bodies fastened with top and bottom rivets forming the body base and protruding turrets, possessing front, top, bottom, side and back walls, a command push button located in a rectangular window embodied in the front wall of a turret and clamping contacts, the top and bottom walls of the base and the front walls of the base and the turret are embodied smoothly convex with the base is expanding between the top and the bottom walls towards the turret. Therewith, the body strength is increased, the useful internal volume is enlarged, the reliability is increased, the high assemblage manufacturability is provided for and the heat dissipation surface is enlarged.

Description

Circuit breaker

The invention relates to the branch of electrical

engineering, particularly to automatic protective electrical

circuit breaker (marked DEK or flΘK and VA or BA), assigned

for commutation and protection of electric circuits from

overloads and shorts mainly in offices and dwellings.

The circuit breaker constitutes a contact switching unit

capable to switch on, to conduct and to switch off currents

under normal conditions in circuits, and also to switch on, to

conduct during preset normalized period, and to switch off

currents under abnormal conditions in circuits such as short-

circuit event.

The automatic circuit breaker is known comprising a

contact system, placed in insulating body that consists of two

half bodies. The body has conjugated flat front, top, bottom

and back walls, command push button located in the window

embodied in the front wall of a turret and clamping contacts

with openings in the top and bottom base walls. (1) The disadvantages of this analogue are low assembly

manufacturability, insufficient strength during transporting and storing, impractical layout due to limited volume of the body,

and insufficient surface of heat dissipation.

Another automatic circuit breaker is known comprising a

contact system, placed in an insulated body, consisting of two

half part bodies attached by edges and fastened by top and

bottom rivets, forming a body base and protruding turrets

possessing conjugated front, top, bottom, side and back

walls, a command push button located in a window embodied

in the front wall of the turret between convex collars adjoining

the side walls and displaced with respect to the middle of the

turret front wall, and clamping contacts with openings in top

and bottom base walls. (2).

The disadvantages of this circuit breaker type are low

assembly manufacturability, insufficient strength during

transporting and storing and insufficient surface of heat

dissipation.

The technological purpose of this invention is to create an

effective and manufacturable automatic circuit breaker and

also expanding the range of automatic circuit breaker. The technological result providing for solution of the

problem constitutes in increased body strength, due to most

part of its walls being embodied as curved shells, useful

internal volume increased to the maximum possible value

within the limits of feasible overall and connecting dimensions,

increased reliability due to locating the push button in its

extreme positions in the special deepenings, which reduces

the risk of accidental switching, high manufacturability of

contact assembling in the body, and enlarged heat dissipation

surface.

The essence of this invention is that this circuit breaker

comprises a contact system placed in a body consisting of two

half part bodies fastened by top and bottom rivets, forming a

body base and a protruding turret possessing conjugated

front, top, bottom, side and back walls, a command push

button located in a window embodied in the front wall of the,

and clamping contacts with openings in top and bottom base

walls. At that, the top and bottom walls of the base and the

front walls of the base and the turret are embodied smoothly convex, while the base is embodied expanding between top and bottom walls towards the turret.

Preferably, the top and the bottom base walls and turret collars are embodied cylindrical, with top and bottom walls of the turret being flat, cylindrical front walls of the base and the turret are concentric to one another, turret collars are deepened at the edges forming two transversal deepenings with curved profiles, and edges of half bodies have staged shape in the transversal direction their junction line being of the staged profile in the transversal direction, clamping contacts possess wells located along the axes perpendicular to the back wall, while bottom rivets are situated under the clamping contact wells and top rivets are situated at the turret corners. The circuit breaker is equipped with the latch placed in

one of the supports on the back wall of the base, and the

button is equipped with knurling attachment with the width

larger than the button width and less (or equal) than the width

of front turret wall. The drawing in Fig.1 shows the general view of the circuit

breaker in the isometric view, and Fig. 2 shows the circuit

breaker cross section.

The circuit breaker comprises a contact system (shown schematically in the Fig.2), placed in an insulating body made from incombustible insulating plastic consisting of two half bodies (not shown) conjugated by edges and fastened with top rivets 1 ,2 and bottom rivets 3,4 forming the body base and the protruding turret is tapered with respect to the base of the body. The base of the body has conjugated front (face) walls 5,6, top wall 7, bottom wall 8, parallel flat side walls, out of which only side wall 9 and back wall 10 are shown in the drawings. The protruding turret has conjugated front (face) wall 11 , top wall 12, bottom wall 13 and flat side walls (not shown due to being extensions of the base side walls 9). The command button 14 is located in the rectangular window (not shown) embodied in the front wall of the turret 11 between convex cylindrical collars 15,16, adjoining side walls and displaced downside from the middle of the front turret wall 11. The top and bottom walls of a base 7, 8 and the front walls of a base and a turret 5,6,11 are embodied smoothly convex, for example cylindrical, concentric to one another, with the base embodied tapered between top and bottom walls 7,8 expanding towards the turret. Top and bottom walls 12,13 are embodied flat.

Turret collars 15, 16 are deepened at the edges forming two transversal deepenings (not shown). The edges of half bodies have staged shape in the transversal direction and are jointed forming the joint line staged in the transversal direction. Clamping contacts have wells 17,18 located along the axes perpendicular to the back wall 10 and cable inlets into the wells 17, 18 embodied in top and bottom base walls 7,8. Bottom rivets 3, 4 are situated under the clamping contact wells 17,18, while top rivets 1 ,2 are at the top corners of the turret. Mutually perpendicular axis of the well 17, 18 of every contact and bottom rivet 3 or 4 axis, respectively, intersect, i.e. these are situated in the same plain.

The circuit breaker is provided with spring latch 19 (Fig. 2)

located in the top one of the supports 20, 21 on the back wall 10 of the base, while a trapezoidal shape protrusion 22 (Fig.1 )

can be embodied in the middle part of the back wall 10.

The button 14 is equipped with the knurling attachment 23 with the width larger than the button 14 width and less or equal to the width of front turret wall 11. The button 14 and the attachment 23 are colored contrasting to the other surfaces.

The circuit breaker mechanism comprises the contact

system and consists of the following component parts: a push

control mechanism with a button 14 and an attachment 23 on a

swivel block (drum) provided with labels ON" (I) and "OFF" (0),

displayed alternatively in the window in extreme position of the

button 14, an electromagnetic solenoid with the core, a

bimetallic plate, an arc control device, etc., shown as contours

in the Fig. 2. Various circuit breaker embodiments comprising

these units are widely known from technological and patent

literature, for example from the analog comprising the three-

dimensional drawing of the assembled switch, and from the

prototype. Due to growth of the internal volume of the body and

its shape advantageous for assembly due to the adopted novel

wall geometry and rational rivet positioning, the capabilities for optimum arrangement all units in the circuit breaker body are

enlarged.

The circuit breaker is used as follows.

The operating position of the circuit breaker is vertical, in

accordance with notation of front, top, bottom, side and back

walls 5-13 of the base and the turret, with the angle tolerance

with respect to the vertical plane ±5°.

Before mounting the circuit breaker it is necessary to

check it for external damages and to switch it several times

manually from "OFF" or "BblKJl" (0) position to the opposite

position "ON" or "BKJ1" (I) and backwards to be sure that

moving mechanism works smoothly without sticking.

By means of support 20,21 and latch 19, the circuit breaker

(one or more) is mounted on the standard rack DIN 35 x 7,5

mm (standard EH 50022). The cables (not shown) of the

protected electric circuit are passed to wells 17,18 from above

and/or from below through holes and are clamped by threaded

parts of clamping contacts. While mounting the position of pushbutton 14 is adjusted so as the label "OFF" on the swivel

block be visible in the window of the turret.

The turning of the pushbutton 14 provides circuit closing to

feed the equipment connected to power supply. In the case of overloading in protected circuit, the

overcurrent (in accordance to the rating value, for example 16

Amps) forces the bimetallic plate to bend, which in turn pushes

the lever of release mechanism. The moving contact separates

from the stationary one, performing the circuit protection from

overloading.

Should a short current appear in the protected circuit, the

core of the electromagnetic release is drawn back and pulls the

lever, which act on the release mechanism. The moving contact

separates from the stationary one, performing the circuit

protection from short-circuit current influence.

Simultaneously with breaking the electric circuit, the

pushbutton 14 returns to the bottom position. The intrinsic time

of circuit breaker tripping is not more than 0.02 sec. To disconnect the voltage, for example during repair

works, the pushbutton 14 could be switched manually. In

extreme positions the attachment 23 is partly recessed in the

wells on the surface 11 along collar edges 15,16. The circuit breaker is practically not heated, as the

internal body volume is sufficient for loose arrangement of the

components, with the heat dissipation surface enlarged. The

curved convex body walls possess adequate strength, ruling

out mechanical damages of the internal components under the

high forces acting during transporting or mounting.

Manufacturing of the half bodies with the curved shells on

standard equipment is quite straightforward.

Thus, an efficient and manufacturable circuit breaker is designed, and the range of circuit breakers has been expanded.

Therewith, the strength of the body the most part of the walls of which are embodied as curved shells is increased, the useful internal volume is enlarged to the maximum possible extent within the limits of feasible overall and connecting dimensions, the reliability has been increased due to locating the push button in its extreme positions in the special

deepenings, which reduces the risk of accidental switching,

high manufacturability of contact assembling in the body has

been provided for, and the heat dissipation surface has been

enlarged.

References 1. Booklet "£(3K^®" (DEC^®), DEC Corporation,

Moscow, Nauchniy proezd, 12, 2001 , p. 2, photo 1 , 3 (circuit breaker). 2. Patent application PCT WO 01/37304, ICL

H01H73/48, 2001 , prototype.

Claims

1. The automatic circuit breaker, comprising a contact

system, located in an insulating body, consisting of two half

bodies fastened with upper and lower rivets forming the body

base and the turret with conjugated front, top, bottom and

back walls, a command push button located in a window of the

front wall of the turret and clamping contacts with openings in

the top and bottom base walls, wherein the top and bottom

walls of the base and the front walls of the base and the turret

are embodied smoothly convex, and the base is embodied

expanded between top and bottom walls towards the turret.

2. The circuit breaker according to Claim 1 , wherein the

window is embodied in the front wall of the turret between

collars adjoining the side walls, the top and bottom walls of the

base and the front walls of the base an turret and the turret

collars are embodied cylindrical, while a top and bottom walls

of the turret are flat.

3. The circuit breaker according to any of the Claims 1 or

2, wherein the cylindrical front walls of the base and the turret

are positioned concentrically to each other, while the turret's collars are deepened at the edges forming two transversal

deepenings.

4. The circuit breaker according to any of the Claims 1 to

3, wherein the edges of half bodies are embodied with staged

shape in the transversal direction and are jointed forming of

the joint line staged in the transversal direction.

5. The circuit breaker according to any of the Claims 1 to

4, wherein the clamping contacts have wells placed along the

axes direction perpendicular to the back wall, with bottom

rivets situated under the clamping contact wells and top rivets

situated at the turret corners.

6. The circuit breaker according to any of the Claims 1 to

5, wherein a latch is located in one of the supports on the

back side of the base.

7. The circuit breaker according to any of the Claims 1 to

6, wherein the pushbutton is equipped with a knurling

attachment with the width larger than the button width and less

or equal to the width of the front turret wall.