EP2731122B1

EP2731122B1 - Thermomagnetic circuit breaker and distribution device

Info

Publication number: EP2731122B1
Application number: EP12819048.5A
Authority: EP
Inventors: Cheng REN; Cheng MA; Kai ZHENG
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2012-03-13
Filing date: 2012-10-30
Publication date: 2016-09-21
Anticipated expiration: 2032-10-30
Also published as: WO2013135049A1; EP2731122A4; CN102610456B; EP2731122A1; CN102610456A

Description

TECHNICAL FIELD

The present invention relates to the field of circuit protection technologies, and in particular, to a thermal magnetic circuit breaker and a power distribution device.

BACKGROUND

A thermal magnetic circuit breaker is an electrical device that can be switched manually, and can also perform loss-voltage protection, under-voltage protection, over-load protection and short-circuit protection automatically. The thermal magnetic circuit breaker can perform protection on a power line, an electric motor and so on, and when the power line or the electric motor has a serious fault, such as over-load, or short-circuit, and under-voltage, the thermal magnetic circuit breaker can automatically cut off the circuit. The thermal magnetic circuit breaker has been widely applied in the field of circuit protection technologies, for example, in protection of a circuit of a power distribution device.
A thermal magnetic circuit breaker in the prior art is as shown in FIG. 1, the thermal magnetic circuit breaker includes an insulating case 11, the insulating case 11 is disposed with a part portion 12, and the part portion 12 includes a contact arc blowout system 121, a free tripping mechanism 122, a handle 123 for operation control, a bimetallic strip 124, and a magnetic tripping mechanism 125. A handle penetration hole 111 for the handle 123 to penetrate is disposed on one side of the insulating case 11. The insulating case 11 is disposed with a first wiring terminal 13 and a second wiring terminal 14. In longitudinal height, the first wiring terminal 13 is disposed above the part portion 12, the second wiring terminal 14 is disposed below the part portion 12, and the thermal magnetic circuit breaker is connected to an external circuit through the first wiring terminal 13 and the second wiring terminal 14. A guide rail slot 15 for being fixed with the external is disposed at a rear part of the thermal magnetic circuit breaker.
The prior art has at least the following problem:

The thermal magnetic circuit breaker occupies large height space, and cannot be applied in short space.

US 4559510 A

US 4516098 A

US 2011/273249 A1

SUMMARY

Embodiments of the present invention provide a thermal magnetic circuit breaker and a power distribution device, which can solve a problem in the prior art that a thermal magnetic circuit breaker occupies large height space and cannot be applied in short space.
In order to achieve the foregoing objective, the embodiments of the present invention adopt the following technical solutions:
A thermal magnetic circuit breaker includes an insulating case and a handle; the insulating case is disposed with a part portion and a wiring terminal portion, the part portion includes an arc blowout chamber, a magnetic tripper, a bimetallic strip and a tripping mechanism, the wiring terminal portion includes a first wiring terminal and a second wiring terminal, a movable contact of the arc blowout chamber is connected to the tripping mechanism through an upper end connecting rod of the tripping mechanism, the tripping mechanism is connected to an end of a coil of the magnetic tripper through a flexible connector, the other end of the coil of the magnetic tripper is connected to the bimetallic strip and one end of the first wiring terminal through a flexible connector, and one end of the second wiring terminal is connected to a static contact seat of the arc blowout chamber; the handle passes through a handle penetration hole and is hinged to the tripping mechanism; the handle penetration hole is disposed on one side of the insulating case; and the insulating case is a cuboid, the wiring terminal portion is disposed on the same side or opposite side of the handle, and longitudinal height of the wiring terminal portion is less than or equal to longitudinal height of the part portion.
A power distribution device includes a power generator, a transformer, a power line and the thermal magnetic circuit breaker.
In the thermal magnetic circuit breaker and the power distribution device provided in the embodiments of the present invention, because the insulating case is a cuboid, the wiring terminal portion is disposed at the same side or opposite side of the handle, and the longitudinal height of the wiring terminal portion is less than or equal to the longitudinal height of the part portion. However, in the prior art, in longitudinal height, the first wiring terminal is disposed above the part portion, and the second wiring terminal is disposed below the part portion. Therefore, the longitudinal height of the wiring terminal portion disposed in the embodiments of the present invention is less than or equal to the longitudinal height of the part portion, thereby reducing the height space occupied by the thermal magnetic circuit breaker, and facilitating the thermal magnetic circuit breaker to be applied in short space.

BRIEF DESCRIPTION OF DRAWINGS

To describe the technical solutions in the embodiments of the present invention or in the prior art more clearly, the following briefly introduces accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description are merely some embodiments of the present invention, and persons of ordinary skill in the art may further obtain other drawings according to these accompanying drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a thermal magnetic circuit breaker in the prior art;
FIG. 2 (a) is a first schematic structural diagram of a thermal magnetic circuit breaker according to an embodiment of the present invention;
FIG. 2 (b) is a second schematic structural diagram of a thermal magnetic circuit breaker according to an embodiment of the present invention;
FIG. 3 is a third schematic structural diagram of a thermal magnetic circuit breaker according to an embodiment of the present invention;
FIG. 4 is a first schematic structural diagram of a thermal magnetic circuit breaker according to another embodiment of the present invention;
FIG. 5 is a second schematic structural diagram of a thermal magnetic circuit breaker according to another embodiment of the present invention;
FIG. 6 is a third schematic structural diagram of a thermal magnetic circuit breaker according to another embodiment of the present invention;
FIG. 7 is a fourth schematic structural diagram of a thermal magnetic circuit breaker according to another embodiment of the present invention; and
FIG. 8 is a fifth schematic structural diagram of a thermal magnetic circuit breaker according to another embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the embodiments to be described are merely part rather than all of the embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
To make the advantages of the technical solutions of the present invention more comprehensible, the following describes the present invention in detail with reference to the accompanying drawings and the embodiments.
As shown in FIG. 3, a thermal magnetic circuit breaker according to an embodiment of the present invention includes an insulating case 21 and a handle 29. The insulating case 21 is disposed with a part portion and a wiring terminal portion, the part portion includes an arc blowout chamber 24, a magnetic tripper 28, a bimetallic strip 27, and a tripping mechanism 25; the wiring terminal portion includes a first wiring terminal 22 and a second wiring terminal 23.
The arc blowout chamber 24 includes a static contact seat 241, a static contact 242 and a movable contact 243. One end of the static contact seat 241 is welded to one end of the first wiring terminal 22, the other end of the static contact seat 241 is disposed with the static contact 242, the static contact 242 is crimping connected to the movable contact 243 when there is current flowing through the circuit breaker, and the movable contact 243 is connected to the tripping mechanism 25 through an upper end connecting rod of the tripping mechanism 25.
A lower end connecting rod of the tripping mechanism 25 is disposed at a gap between the bimetallic strip 27 and the magnetic tripper 28. The thermal magnetic circuit breaker is further disposed with the handle 29, the tripping mechanism 25 is hinged to the handle 29 so that when a fault occurs, the tripping mechanism 25 can drive the handle 29 to trip, and the other end of the handle 29 besides the end hinged to the tripping mechanism 25 penetrates the handle penetration hole 211.
A movable iron core 281 is disposed inside a coil of the magnetic tripper 28, and a push rod 282 is disposed inside the movable iron core 281; there is a flexible connector 26 welded to one end of the coil of the magnetic tripper 28, and one end of the flexible connector 26, one end of the bimetallic strip 27 and one end of the second wiring terminal 23 are welded into one piece.
The handle 29 passes through the handle penetration hole 211 and is hinged to the tripping mechanism 25; the handle penetration hole 211 is disposed on one side of the insulating case 21.
As shown in FIG. 2 (a), FIG. 2 (b), and FIG. 3, the insulating case 21 is a cuboid, the wiring terminal portion is disposed at the same side or opposite side of the handle 29, and longitudinal height of the wiring terminal portion is less than or equal to longitudinal height of the part portion.
In the thermal magnetic circuit breaker provided in the embodiment of the present invention, because the insulating case is a cuboid, the wiring terminal portion is disposed at the same side or opposite side of the handle, and the longitudinal height of the wiring terminal portion is less than or equal to the longitudinal height of the part portion. However, in the prior art, in longitudinal height, the first wiring terminal is disposed above the part portion, and the second wiring terminal is disposed below the part portion. Therefore, the longitudinal height of the wiring terminal portion disposed in the embodiment of the present invention is less than or equal to the longitudinal height of the part portion, thereby reducing the height space occupied by the thermal magnetic circuit breaker, and facilitating the thermal magnetic circuit breaker to be applied in short space.
In order to make persons skilled in the art better understand the technical solutions of the present invention, the thermal magnetic circuit breaker in FIG. 2 (b) is described in further detail in the following.
As shown in FIG. 3, a thermal magnetic circuit breaker according to another embodiment of the present invention includes an insulating case 21 and a handle 29. The insulating case 21 is disposed with a part portion and a wiring terminal portion, the part portion includes an arc blowout chamber 24, a magnetic tripper 28, a bimetallic strip 27, and a tripping mechanism 25; the wiring terminal portion includes a first wiring terminal 22 and a second wiring terminal 23. One end of the first wiring terminal 22 is welded to a static contact seat 21 of the arc blowout chamber 24; one end of the second wiring terminal 23 is welded to one end of the bimetallic strip 27, and is connected to the magnetic tripper 28 through a flexible connector; the handle 29 passes through a handle penetration hole 211 and is hinged to the tripping mechanism 25, and the handle penetration hole 211 is disposed on one side of the insulating case 21. The insulating case 21 is a cuboid, the wiring terminal portion is disposed at the same side of the handle 29, and longitudinal height of the wiring terminal portion is less than or equal to longitudinal height of the part portion.
The thermal magnetic circuit breaker provided in the embodiment of the present invention occupies small height space, and can be applied in a subrack power supply having height of 1 U (1 U = 44.45 mm) or 2 U (2 U = 88.9 mm).
Specifically, the first wiring terminal 22 and the second wiring terminal 23 may be, but are not limited to, copper wiring terminals or aluminum wiring terminals.
Further, as shown in FIG. 3, at least one side of other sides of the insulating case 21, except the side disposed with the wiring terminal portion, is disposed with a fixing screw hole 212.
Or, as shown in FIG. 4, at least one side of other sides of the insulating case 21, except the side disposed with the wiring terminal portion, is disposed with a guide rail slot 214. The thermal magnetic circuit breaker is fixed to an external environment through a fixing screw hole and a screw, or fixing may also be performed through the disposed guide rail slot, to which the present invention is not limited.
As shown in FIG. 3, that a fixing screw hole 212 is disposed on a side opposite to the side disposed with the wiring terminal portion is taken for description here.
Further, the first wiring terminal 22 and the second wiring terminal 23 may be, but are not limited to, cage terminals, stud-type wiring terminals, push-in bolt terminals, push-in Q.C terminals, or bus-type terminals.
For example, in a schematic structural diagram of the thermal magnetic circuit breaker shown in FIG. 3, the first wiring terminal 22 and the second wiring terminal 23 are cage terminals.
For example, in a schematic structural diagram of a thermal magnetic circuit breaker shown in FIG. 5, the first wiring terminal 22 and the second wiring terminal 23 are stud-type wiring terminals.
For example, in a schematic structural diagram of a thermal magnetic circuit breaker shown in FIG. 6, the first wiring terminal 22 and the second wiring terminal 23 are push-in bolt terminals.
For example, in a schematic structural diagram of a thermal magnetic circuit breaker shown in FIG. 7, the first wiring terminal 22 and the second wiring terminal 23 are push-in Q.C terminals.
For example, in a schematic structural diagram of a thermal magnetic circuit breaker shown in FIG. 8, the first wiring terminal 22 and the second wiring terminal 23 are bus-type terminals.
Further, a material of the arc blowout chamber 24 may be a permanent magnet material. In this way, the thermal magnetic circuit breaker adopts the arc blowout chamber made of the permanent magnet material to enable an arc formed during a break of a circuit to blow out rapidly, and may be applied in a direct current circuit, so that the thermal magnetic circuit breaker is used as a direct current thermal magnetic circuit breaker.
Further, as shown in FIG. 3, the side disposed with the handle penetration hole 211 is disposed with a state monitoring lead penetration hole 213, and the thermal magnetic circuit breaker further includes a first state monitoring lead 31 and a second state monitoring lead 32, one end of the first state monitoring lead 31 passes through the state monitoring lead penetration hole 213, the other end of the first state monitoring lead 31 is welded to the first wiring terminal 22, one end of the second state monitoring lead 32 passes through the state monitoring lead penetration hole 213, and the other end of the second state monitoring lead 31 is welded to the second wiring terminal 23. By connecting to an external device through the first state monitoring lead and the second state monitoring lead that pass through the hole, ON and OFF of an internal circuit of the thermal magnetic circuit breaker may be monitored in real time, for example, the external device may be, but is not limited to, an indicator light.
Further, as shown in FIG. 3, the side disposed with the handle penetration hole 211 is disposed with a monitoring apparatus 33, and the monitoring apparatus 33 is connected to the first state monitoring lead 31 and the second state monitoring lead 32. The monitoring apparatus may be, but is not limited to, an indicator light. By disposing the monitoring apparatus on the thermal magnetic circuit breaker, ON and OFF of an internal circuit of the thermal magnetic circuit breaker may be monitored in real time.
In order to make persons skilled in the art better understand the thermal magnetic circuit breaker provided in the embodiments of the present invention, a working process of the thermal magnetic circuit breaker is described briefly in the following.
The thermal magnetic circuit breaker may be applied in short-circuit protection of a circuit, for example:
When a load is short-circuited, short-circuit current flows through the magnetic tripper 28 of thermal magnetic circuit breaker, the magnetic tripper 28 generates an electromagnetic force to attract the movable iron core 281 to move downwards, the movable iron core 281 pushes the push rod 282 to move downwards, the push rod impacts the lower end connecting rod of the tripping mechanism 25, so that the tripping mechanism 25 pushes the movable contact 243 to be separated from contact with the static contact 241, thereby enabling the thermal magnetic circuit breaker to trip.
The thermal magnetic circuit breaker may also be applied in over-current protection of a circuit, for example:
When current of a load is excessively large, the current flows through the bimetallic strip 27, after a certain period of time, temperature of the bimetallic strip 27 rises, and because the bimetallic strip 27 adopts two kinds of metal having different expansion coefficients, the bimetallic strip 27 bends towards the tripping mechanism, so as to push the tripping mechanism 25, and then push the movable contact 243 to be separated from contact with the static contact 241, thereby enabling the thermal magnetic circuit breaker to trip.
In the thermal magnetic circuit breaker provided in the another embodiment of the present invention, because the insulating case is a cuboid, the wiring terminal portion is disposed at the same side or opposite side of the handle, and the longitudinal height of the wiring terminal portion is less than or equal to the longitudinal height of the part portion. However, in the prior art, in longitudinal height, the first wiring terminal is disposed above the part portion, and the second wiring terminal is disposed below the part portion. Therefore, the longitudinal height of the wiring terminal portion disposed in the embodiment of the present invention is less than or equal to the longitudinal height of the part portion, thereby reducing the height space occupied by the thermal magnetic circuit breaker, and facilitating the thermal magnetic circuit breaker to be applied in short space.
An embodiment of the present invention provides a power distribution device, including a power generator, a transformer, a power line and a thermal magnetic circuit breaker. The thermal magnetic circuit breaker includes: an insulating case and a handle. The insulating case is disposed with a part portion and a wiring terminal portion, the part portion includes an arc blowout chamber, a magnetic tripper, a bimetallic strip, and a tripping mechanism; and the wiring terminal portion includes a first wiring terminal and a second wiring terminal. A movable contact of the arc blowout chamber is connected to the tripping mechanism through an upper end connecting rod of the tripping mechanism, the tripping mechanism is connected to one end of a coil of the magnetic tripper through a flexible connector, the other end of the coil of the magnetic tripper is connected to the bimetallic strip and one end of the first wiring terminal through a flexible connector, and one end of the second wiring terminal is connected to a static contact seat of the arc blowout chamber. The handle passes through a handle penetration hole and is hinged to the tripping mechanism; and the handle penetration hole is disposed on one side of the insulating case.
The insulating case is a cuboid, the wiring terminal portion is disposed at the same side or opposite side of the handle, and longitudinal height of the wiring terminal portion is less than or equal to longitudinal height of the part portion.
A specific structure of the thermal magnetic circuit breaker is the same as that of the specific embodiment of the thermal magnetic circuit breaker described in the foregoing, and is not repeatedly described here.
The thermal magnetic circuit breaker may be, but is not limited to, applied in a power distribution device having a short subrack.
The foregoing description is merely specific embodiments of the present invention, but is not intended to limit the protection scope of the present invention. Any variation or replacement readily figured out by persons skilled in the art within the technical scope disclosed in the present invention shall fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

A thermal magnetic circuit breaker, comprising: an insulating case (21) and a handle (29); wherein, the insulating case (21) is disposed with a part portion and a wiring terminal portion, the part portion comprises an arc blowout chamber (24), a magnetic tripper (28), a bimetallic strip (27) and a tripping mechanism (25), the wiring terminal portion comprises a first wiring terminal (22) and a second wiring terminal (23), a movable contact (243) of the arc blowout chamber (24) is connected to the tripping mechanism (25) through an upper end connecting rod of the tripping mechanism (25), the tripping mechanism (25) is connected to one end of a coil of the magnetic tripper (28) through a flexible connector, the other end of the coil of the magnetic tripper (28) is connected to the bimetallic strip (27) and one end of the second wiring terminal (23) through a flexible connector (26), and one end of the first wiring terminal (22) is connected to a static contact seat (241) of the arc blowout chamber (24); the handle (29) passes through a handle penetration hole (211) and is hinged to the tripping mechanism (25); and the handle penetration hole (211) is disposed on one side of the insulating case (21); and wherein,
the insulating case (21) is a cuboid, the wiring terminal portion is disposed at the same side or opposite side of the handle (29), and longitudinal height of the wiring terminal portion is less than or equal to longitudinal height of the part portion.
The thermal magnetic circuit breaker according to claim 1, wherein, at least one side of other sides of the insulating case (21), except the side disposed with the wiring terminal portion, is disposed with a fixing screw hole (212).
The thermal magnetic circuit breaker according to claim 1, wherein, at least one side of other sides of the insulating case (21), except the side disposed with the wiring terminal portion, is disposed with a guide rail slot (214).
The thermal magnetic circuit breaker according to claim 1, wherein, the first wiring terminal (22) and the second wiring terminal (23) are: copper wiring terminals or aluminum wiring terminals.
The thermal magnetic circuit breaker according to claim 1, wherein, the first wiring terminal (22) and the second wiring terminal (23) are: cage terminals, stud-type wiring terminals, push-in bolt terminals, push-in Q.C terminals, or bus-type terminals.
The thermal magnetic circuit breaker according to claim 1, wherein, the side disposed with the handle penetration hole (211) is disposed with a state monitoring lead penetration hole (213);
the thermal magnetic circuit breaker further comprises a first state monitoring lead (31) and a second state monitoring lead (32); and
one end of the first state monitoring lead (31) passes through the state monitoring lead penetration hole (212), the other end of the first state monitoring lead (31) is connected to the first wiring terminal (22), one end of the second state monitoring lead (32) passes through the state monitoring lead penetration hole (213), and the other end of the second state monitoring lead (32) is connected to the second wiring terminal (23).
The thermal magnetic circuit breaker according to claim 6, wherein, the side disposed with the handle penetration hole (211) is disposed with a monitoring apparatus (33), and the monitoring apparatus (33) is connected to the first state monitoring lead (31) and the second state monitoring lead (32).
A power distribution device, comprising a power generator, a transformer, a power line and a thermal magnetic circuit breaker according to any one of the proceeding claims 1 to 7.
The power distribution device according to claim 8, wherein, the side which is of the thermal magnetic circuit breaker and is disposed with the handle penetration hole (211) is disposed with a state monitoring lead penetration hole (213);
the thermal magnetic circuit breaker further comprises a first state monitoring lead (31) and a second state monitoring lead (32); and
one end of the first state monitoring lead (31) passes through the state monitoring lead penetration hole (213), the other end of the first state monitoring lead (31) is connected to the first wiring terminal (22), one end of the second state monitoring lead (32) passes through the state monitoring lead penetration hole (213), and the other end of the second state monitoring lead (32) is connected to the second wiring terminal (23).
The power distribution device according to claim 9, wherein, the side which is of the thermal magnetic circuit breaker and is disposed with the handle penetration hole (211) is disposed with a monitoring apparatus (33), and the monitoring apparatus (33) is connected to the first state monitoring lead (31) and the second state monitoring lead (32).