EP3483912B1

EP3483912B1 - Electrically conductive loop of circuit breaker

Info

Publication number: EP3483912B1
Application number: EP17823580.0A
Authority: EP
Inventors: Xiang Gu; Guping JIANG; Zhili JIANG; Wennan HE
Original assignee: Zhejiang Chint Electrics Co Ltd; Noark Electrics Shanghai Co Ltd; SEARI Electric Technology Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd; Noark Electrics Shanghai Co Ltd; SEARI Electric Technology Co Ltd
Priority date: 2016-07-06
Filing date: 2017-07-03
Publication date: 2024-08-07
Anticipated expiration: 2037-07-03
Also published as: PE20191259A1; CN105931928B; EP3483912C0; EP3483912A1; MX2019000186A; EP3483912A4; CO2019000055A2; CL2019000020A1; BR112019000279A2; WO2018006768A1; CN105931928A

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

Embodiments of the present invention relate to the field of low voltage electrical appliances and, more particularly, to a circuit breaker comprising an electrical path.

2. The Related Art

As the photovoltaic power generation industry controls costs more and more strictly, the cost control on equipment by combiner box and inverter manufacturers is becoming more and more rigorous. The current development trend of the market is to increase the system voltage to reduce the cost of equipment. A consensus is that the voltage of photovoltaic systems will increase from the existing DC1000V to DC1500V in the future. Therefore, DC1500V will become the mainstream voltage of the photovoltaic industry in the future. The rated voltage of the matching switch devices also needs to be increased accordingly.
Circuit breakers are the main switch devices in various circuit equipment. Therefore, photovoltaic dedicated direct current molded-case circuit breakers with DC1500V rated voltage will become the mainstream product of the future photovoltaic industry demand. In order to achieve the short-circuit breaking capacity at high voltage, in order to improve the rated working voltage of the DC circuit breaker, internal or external cascade connection is usually adopted to achieve a higher rated working voltage by providing multiple break points of a plurality of contact groups.
However, the plurality of contact groups that are cascade-connected need to occupy more space, which will increase the product volume, and in the case of increasingly higher requirements for the product volume, it is required to install a plurality of contact groups in a small space. This poses a challenge to the reliability of the cascade connection of the contact groups and the difficulty of installation.
CN 203 300 573 U describes a multi-breakpoint plastic shell circuit breaker according to the preamble of claim 1 and comprising a four-pole insulated casing provided with a first pole, a second pole, a third pole and a fourth pole which are sequentially arranged. The inside of each pole is provided with a group of mutually-matched movable and static contacts. The two non-adjacent moving contacts of the second pole and the fourth pole are electrically connected by a wire and the two ends of the static contacts of the second pole and the third pole are short-circuited by a first short-circuiting conductor in the insulated casing.
CN 105 719 918 A describes a multibreak molded case circuit breaker comprising an insulating shell at least comprising a first pole and a second pole. A moving contact and a stationary contact in pairs are arranged in each pole of the substrate of the insulating shell, and the adjacent poles are separated from each other by an interpolar partition formed on the substrate. The moving contact of one pole is connected with the stationary contact of the adjacent pole in series via a short circuit conductor, and the short circuit conductor is arranged along the interpolar partition in the length direction of the interpolar partition.
CN 104 779 129 A describes a circuit breaker with a double-layer cascade structure, comprising an L-shaped stationary contact and a base. The stationary contact comprises a contact part and a cascade part, and is fixedly mounted on the base. The contact part is positioned on an upper layer of the base. The cascade part is positioned on a lower layer of the base.
CN 102 456 515 A describes a multi-break circuit breaker with a preset connecting mode. In an insulating shell, every two adjacent groups of movable contacts are connected by a conductor, or a group of movable contacts and static contacts corresponding to the adjacent group of movable contacts are connected by another conductor. After connection in any mode, poles which are provided with at least two breaks connected in series and are homopolar and cophasal are formed. Two groups of movable contacts can rotate independently relative to an insulating rotary shaft. A plurality of breakpoints are connected in series in the circuit breaker shell.

SUMMARY

Embodiments of the present invention disclose a circuit breaker comprising an electrical path, comprising: a base; an inlet contact group; an outlet contact group; and a conductive assembly. The inlet contact group is connected to an inlet terminal, and the outlet contact group is connected to an outlet terminal. The conductive assembly comprises a soft connection assembly and a hard connection assembly. The hard connection assembly is fixed to the base of the circuit breaker; the soft connection assembly is connected to the inlet contact group and the outlet contact group; the soft connection assembly and the hard connection assembly are connected to provide an electrical path between the inlet contact group and the outlet contact group. The inlet contact group and the outlet contact group are coaxially mounted.
Additionally, the hard connection assembly includes a connecting member and a conductive strip. The connecting member is configured to be fixed to the base of the circuit breaker and extends from a position near the inlet contact group to a position near the outlet contact group. The conductive strip is fixed to the connecting member and is adjacent to the inlet contact group and the outlet contact group. The connecting member is L-shaped and comprises a main body portion and an extended portion extending in a direction perpendicular to the main body portion. The soft connection assembly comprises an inlet side soft connection and an outlet side soft connection. The conductive strip comprises an inlet side conductive strip and an outlet side conductive strip. An end of the inlet side soft connection is connected to the inlet side conductive strip, and another end of the inlet side soft connection is connected to the inlet contact group. An end of the outlet side soft connection is connected to the outlet side conductive strip, and another end of the outlet side soft connection is connected to the outlet contact group. The connecting member is provided with a connecting hole at each end of the main body portion, a fixing hole between the two connecting holes on the main body portion, and a fixing hole on the extended portion.
The connecting member is fixed by a fastener to the base of the circuit breaker through each of the fixing holes, and each of the conductive strips is fixed by a fastener to the connecting member through the corresponding connecting hole.
In one embodiment, the inlet contact group comprises: an inlet static contact and an inlet moving contact. The inlet static contact is connected to the inlet terminal. The inlet side soft connection is connected to the inlet moving contact.
In one embodiment, the outlet contact group comprises: an outlet static contact and an outlet moving contact. The outlet static contact is connected to the outlet terminal. The outlet side soft connection is connected to the outlet moving contact.
In one embodiment, the inlet moving contact is mounted coaxially with the outlet moving contact.
In one embodiment, a plurality of inlet contact groups are provided, and the inlet moving contacts of the plurality of inlet contact groups are coaxially mounted.
The electrical path according to one or more embodiments of the present invention, by combining a soft connection and a hard connection, utilizes the flexibility of the soft connection to make the mounting of the contact groups more flexible and convenient, and utilizes the hard connection to obtain a reliable and stable electrical path, thereby achieving a balance between assembly efficiency and assembly quality.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features, natures, and advantages of the present invention will be more apparent from the following description of the embodiments with reference to the accompanying drawings, wherein,

FIG. 1a and FIG. 1b show structural diagrams of an electrical path for a circuit breaker in accordance with an embodiment of the present invention.
FIG. 2 shows a schematic diagram of the connection of a conductive assembly in an electrical path for a circuit breaker in accordance with an embodiment of the present invention.
FIG. 3 shows a structural diagram of a connecting member in an electrical path for a circuit breaker in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF EMBODIMENTS

FIG. 1a and FIG. 1b show structural diagrams of an electrical path for a circuit breaker in accordance with an embodiment of the present invention. Referring to FIG. 1a and FIG. 1b, the electrical path for the circuit breaker comprises: an inlet contact group; an outlet contact group; and a conductive assembly. The inlet contact group, the outlet contact group, and the conductive assembly are all mounted within a housing of the circuit breaker. The inlet contact group is connected to an inlet terminal. The outlet contact group is connected to an outlet terminal. The conductive assembly comprises a soft connection assembly and a hard connection assembly. The hard connection assembly is fixed to a base of the circuit breaker; the soft connection assembly is connected to the inlet contact group and the outlet contact group; the soft connection assembly and the hard connection assembly are connected to provide an electrical path between the inlet contact group and the outlet contact group. The inlet contact group and the outlet contact group are coaxially mounted.
Specifically, the inlet contact group includes an inlet static contact 121 and an inlet moving contact 122. The inlet static contact 121 is connected to the inlet terminal 123, and the inlet terminal 123 is a wiring strip. The inlet moving contact 122 is rotatably mounted on a rotation shaft. The inlet moving contact 122 rotates about the rotation shaft, and an end portion of the inlet moving contact contacts or separates from a contact 120 on the inlet static contact 121 to form a switching circuit. The root portion of the inlet moving contact 122 is connected to the conductive assembly. The outlet contact group includes an outlet static contact 131 and an outlet moving contact 132. The outlet static contact 131 is connected to an outlet terminal 133, and the outlet terminal 133 is an outlet conductive strip. The outlet moving contact 132 is rotatably mounted on a rotation shaft. The outlet moving contact 132 rotates about the rotation shaft, and an end portion of the outlet moving contact contacts or separates from a contact 130 on the outlet static contact 131 to form a switching circuit. The root portion of the outlet moving contact 132 is connected to the conductive assembly. As shown, the inlet moving contact 122 and the outlet moving contact 132 are coaxially mounted. In other words, the inlet moving contact 122 and the outlet moving contact 132 are mounted on the same rotation shaft 141 and rotate about the rotation shaft 141. It should be noted that although coaxial mounting is performed, the inlet moving contact 122 and the outlet moving contact 132 are independently operated, and the two are not synchronized. The purpose of coaxial mounting is to simplify the structure and to save space. The number of inlet contact groups may be multiple, and the inlet moving contacts of the multiple inlet contact groups are coaxially mounted. For example, in the illustrated embodiment, two inlet contact groups are provided, and the inlet moving contacts of the two inlet contact groups are mounted coaxially. Thus, in the illustrated embodiment, the two inlet moving contacts and the one outlet moving contact are all coaxially mounted.
From the perspective of mechanical connection, the inlet and outlet moving contacts are coaxially mounted. From an electrical perspective, the conductive assembly electrically connects the inlet contact group and the outlet contact group. The conductive assembly includes a soft connection assembly and a hard connection assembly. The hard connection assembly includes a connecting member 111 and a conductive strip 112. FIG. 3 shows a structural diagram of a connecting member in an electrical path for a circuit breaker in accordance with an embodiment of the present invention. As shown in FIG. 3, the connecting member 111 is substantially L-shaped. A connecting hole 119 is provided at each end of the main portion of the connecting member 111. The position of the connecting hole 119 is set close to the position of the inlet moving contact or the outlet moving contact. Fixing holes 118 are disposed at unoccupied positions on the connecting member 111. In the illustrated embodiment, a fixing hole 118 is disposed between the two connecting holes 119 on the main portion. Since the conductive strip 112 needs to be fixed through the connecting holes 119, the size of the conductive strip 112 needs to be considered when providing the fixing holes 118 so that the situation where the conductive strip 112 obscures the fixing holes 118 is avoided. The main portion of the connecting member 111 is disposed along the direction between the inlet contact group and the outlet contact group, extending and substantially covering the distance between the inlet contact group and the outlet contact group. In the illustrated embodiment, in order to reinforce the strength of the connecting member 111 and the connection strength of the connecting member 111 to the base of the circuit breaker, an extended portion extends in a direction perpendicular to the main body portion, forming an L shape. A fixing hole 118 is also provided on the extended portion, and the fixing hole 118 can be operated more conveniently because there is no interference from the conductive strip. The connecting member is fixed to the base of the circuit breaker by fasteners, such as screws or bolts, through the mounting holes 118. Similarly, the conductive strip 112 is fixed to the connecting member 111 by fasteners, such as bolts, passing through the connecting holes 119.
Referring to FIG. 2, FIG. 2 shows a schematic diagram of the connection of a conductive assembly in an electrical path for a circuit breaker in accordance with an embodiment of the present invention. In FIG. 2, the inlet moving contact of the inlet contact group is taken as an example for description. It should be understood that the connection manner of the outlet moving contact in the outlet contact group is similar. The soft connection in the conductive assembly includes an inlet side soft connection and an outlet side soft connection, and the conductive strip includes an inlet side conductive strip and an outlet side conductive strip. The inlet side soft connection and the outlet side soft connection are the same components, and the inlet side conductive strip and the outlet side conductive strip are the same components. Different names are used as they are applied to the inlet side and the outlet side. As shown in FIG. 2, the inlet side conductive strip 112 is fixed to the connecting member 111 by a fastener 113. The position of the inlet side conductive strip 112 is close to the inlet moving contact 122. The inlet side soft connection 115 is a set of wires. An end of the inlet side soft connection 115 is connected to the inlet side conductive strip 112, and another end of the inlet side soft connection 115 is connected to the inlet moving contact 122 of the inlet contact group. In one embodiment, both ends of the inlet side soft connection 115 are soldered to the conductive strip and the moving contact, respectively. Similarly, the outlet side conductive strip is fixed to the connecting member 111 by a fastener. The position of the outlet side conductive strip is close to the outlet moving contact. The outlet side soft connection is a set of wires. An end of the outlet side soft connection is connected to the outlet side conductive strip, and another end of the outlet side soft connection is connected to the outlet moving contact 132 of the outlet contact group. In one embodiment, both ends of the outlet side soft connection are soldered to the conductive strip and the moving contact, respectively. In FIG. 1b, the conductive assembly, the inlet moving contact and the outlet moving contact can be observed simultaneously after mounting is completed.
The conductive assembly provides an electrical path between the inlet contact group and the outlet contact group. The inlet side soft connection and the inlet side conductive strip are connected to the inlet contact group, and the outlet side soft connection and the outlet side conductive strip are connected to the outlet contact group. In one embodiment, the connecting member of the conductive assembly is itself made of a conductive material, such as a metal material, so that the inlet side conductive strip and the outlet side conductive strip are electrically connected by the connecting member. In other embodiments, other wiring paths, such as wires disposed along the connecting member, may also be disposed between the inlet side conductive strip and the outlet side conductive strip to effect conduction of the circuit. The hard connection assembly of the conductive assembly is fixed to the base of the circuit breaker, so that the entire conductive path can be stably and firmly fixed to achieve a stable connection of the electrical path.
Referring to FIG. 1a, the electrical path between the inlet terminal 123 and the outlet terminal 133 is as follows. The inlet terminal is connected to the inlet static contact. The inlet static contact and the inlet moving contact contact to be closed. The inlet moving contact is connected to the outlet moving contact through the inlet side soft connection, the inlet side conductive strip, the connecting member, the outlet side conductive strip, and the outlet side soft connection. The outlet moving contact and the outlet static contact contact to be closed. The outlet terminal is connected to the outlet static contact to realize a complete conductive loop.
The electrical path according to one or more embodiments of the present invention, by combining a soft connection and a hard connection, utilizes the flexibility of the soft connection to make the mounting of the contact groups more flexible and convenient, and utilizes the hard connection to obtain a reliable and stable electrical path, thereby achieving a balance between assembly efficiency and assembly quality.
The above embodiments are provided to those skilled in the art to implement or use the present invention, and those skilled in the art can make various modifications or changes to the above embodiments without departing from the scope of protection of the present invention. The scope of protection of the present invention is therefore not limited by the above embodiments but should conform to the maximum scope of the innovative features mentioned in the claims.

Claims

A circuit breaker comprising an electrical path, comprising:
a base;

an inlet contact group (121, 122) connected to an inlet terminal (123);

an outlet contact group (131, 132) connected to an outlet terminal (133); and

a conductive assembly (115, 111, 112) comprising a soft connection assembly (115) and a hard connection assembly (111, 112), wherein the hard connection assembly (111, 112) is fixed to the base of the circuit breaker, the soft connection assembly (115) is connected to the inlet contact group (121, 122) and the outlet contact group (131, 132), the soft connection assembly (115) and the hard connection assembly (111, 112) are connected to provide an electrical path between the inlet contact group (121, 122) and the outlet contact group (131, 132),

wherein the inlet contact group (121, 122) and the outlet contact group (131, 132) are coaxially mounted, characterized in that

the hard connection assembly (111, 112) comprises a connecting member (111) and a conductive strip (112),

the connecting member (111, 112) is fixed to the base of the circuit breaker and extends from a position near the inlet contact group (121, 122) to a position near the outlet contact group (131, 132),

the conductive strip (112) is fixed to the connecting member (111) and is adjacent to the inlet contact group (121, 122) and the outlet contact group (131, 132),

the connecting member (111) is L-shaped and comprises a main body portion and an extended portion extending in a direction perpendicular to the main body portion,

the soft connection assembly (115) comprises an inlet side soft connection (115) and an outlet side soft connection; the conductive strip (112) comprises an inlet side conductive strip (112) and an outlet side conductive strip; an end of the inlet side soft connection (115) is connected to the inlet side conductive strip (112), and another end of the inlet side soft connection (115) is connected to the inlet contact group (121, 122); an end of the outlet side soft connection is connected to the outlet side conductive strip, and another end of the outlet side soft connection is connected to the outlet contact group (131, 132),

the connecting member (111) is provided with a connecting hole (119) at each end of the main body portion, a fixing hole (118) between the two connecting holes (119) on the main body portion, and a fixing hole (118) on the extended portion, the connecting member (111) is configured to be fixed by a fastener to the base of the circuit breaker through each of the fixing holes (118), and each of the conductive strips (112) is fixed by a fastener to the connecting member (111) through the corresponding connecting hole (119).
The circuit breaker according to claim 1, wherein the inlet contact group (121, 122) comprises:
an inlet static contact (121) connected to the inlet terminal (123);

an inlet moving contact (122), wherein the inlet side soft connection (115) is connected to the inlet moving contact (122).
The circuit breaker according to claim 2, wherein the outlet contact group (131, 132) comprises:
an outlet static contact (131) connected to the outlet terminal (133);

an outlet moving contact (132), wherein the outlet side soft connection is connected to the outlet moving contact (132).
The circuit breaker according to claim 3, wherein the inlet moving contact (122) and the outlet moving contact (132) are coaxially mounted.
The circuit breaker according to claim 4, wherein a plurality of inlet contact groups are provided, and the inlet moving contacts of the plurality of inlet contact groups are coaxially mounted.