WO2017186061A1

WO2017186061A1 - Circuit breaker contact system and circuit breaker

Info

Publication number: WO2017186061A1
Application number: PCT/CN2017/081444
Authority: WO
Inventors: 南寅; 李超; 张强; 刘磊
Original assignee: 首瑞（天津）电气设备有限公司
Priority date: 2016-04-29
Filing date: 2017-04-21
Publication date: 2017-11-02
Also published as: MX2018012426A; CN105762038A; ZA201806529B; CN105762038B

Abstract

A circuit breaker contact system and a circuit breaker, comprising: a contact support; a rotary support shaft; a busbar; a plurality of conductive sheet groups, each conductive sheet group comprising two or three conductive sheets, each conductive sheet being provided with a contact, and the plurality of conductive sheet groups being arranged in parallel and rotatably supported on the contact support by means of the rotary support shaft, so that the plurality of contacts form a contact surface that can contact an external conductor to achieve electric conduction; and a flexible connecting piece, two ends of which are respectively electrically connected with the plurality of conductive sheets and the busbar. A first gap is formed between two adjacent conductive sheet groups, a second gap is formed between two adjacent conductive sheets in each of the conductive sheet groups, and the first gap is larger than the second gap; contacts on the conductive sheets at two sides of the conductive sheet group are disposed distant from each other and deflected in the arrangement direction of the conductive sheets. A condition that a contact pressure between the conductive sheets and the external conductor is decreased due to overheated fusion welding of the contacts is avoided.

Description

Circuit breaker contact system and circuit breaker

Technical field

The invention belongs to the technical field of electrical switches, and in particular relates to a circuit breaker contact system and a circuit breaker.

Background technique

Circuit breakers are an important part of power distribution equipment. They are mainly used in industrial low-voltage power systems to connect and disconnect currents in power grid circuits and protect lines and power equipment from overload, undervoltage, short-circuit, single-phase grounding, etc. Hazard. With the continuous improvement of power engineering and power transmission and distribution equipment requirements, the performance requirements for circuit protection switches are also getting higher and higher, miniaturization, high performance, modularization, high reliability is the current stage of universal circuit breakers. The main development direction.

The circuit breaker is divided into a high voltage circuit breaker and a low voltage circuit breaker according to its use range. Low-voltage circuit breaker, also known as automatic switch, is commonly known as "air switch". It is an electrical appliance that has both manual opening and closing functions and automatic intelligent analysis and protection of voltage loss, undervoltage, overload, and short-circuit faults. In the actual use of the circuit breaker, when it is in the closed state, if a short-circuit fault occurs in the line, for the purpose of selective protection, it is required to have the protection characteristic of the delay action, that is, short before the short-circuit current is cut off. The time can be withstood by the impact caused by the short-circuit current, so as to ensure that when the lower branch is faulty, the fault is removed by the lower-end breaker as much as possible, the power-off range is reduced, and the loss is reduced.

The contact system is an important part of the circuit breaker. The design of the contact spring parameters and the final pressure value of the contact system in the contact system is critical and directly related to the short-time withstand performance of the circuit breaker. Increasing the short-time withstand current of the circuit breaker can increase the selective protection range of the class B circuit breaker, effectively improve the reliability of the differential protection, and prevent accidents such as over-the-counter tripping. Under the impact of short-circuit current, the huge electric repulsion will cause the contact pressure between the contacts to decrease, resulting in overheating and even welding, so that the circuit breaker can not continue to work normally; it may even cause the moving and static contacts to open, causing strong arc burnout. Contacts and circuit breakers.

It is well known that increasing the number of fingers can effectively reduce the electric repulsion, which in turn makes the circuit breaker Under the condition that the final pressure of the contact is not increased, the current can be withstand through a higher short circuit. Chinese Patent No. 200710025637.6 discloses a movable contact structure of a circuit breaker. In order to improve the short-time withstand current, an increased touch is adopted in the contact holder. The method of the number of head pieces is as follows: an isolation grid in which the conductive sheet and the contact holder are integrated, a fixed bracket and a grid are used to separate the contacts, and the isolation spacer is used to increase the accommodation space of the contact, thereby increasing The method of the number of conductors. This method has the following disadvantages with the prior art:

On the one hand, the number of contacts is increased in a limited space. This method of increasing the number of contacts is bound to lead to a reduction in the thickness of the contacts. The excessive number of contacts and the thickness of the contacts are too thin to be used under the contacts. The space for placing the contact spring is greatly reduced, resulting in an excessively high aspect ratio of the spring, or the excessive number of contacts may cause the thickness of the isolation grid to become thin, resulting in a tilting of the contacts during closing, which makes the contact The spring between the head and the contact support is skewed, and the spring is always in the extreme pressure state when the contact spring is continuously operated for a long time, which is easy to fail due to fatigue, resulting in the contact spring pressure on the contact when the closing position is reduced. Small, which in turn causes the final pressure of the contact to decrease;

On the other hand, the final pressure of the contact is reduced, the contact resistance of the contact surface of each other is increased, the reliability of the electrical connection is lowered, the temperature rise of the contact is increased, the resistance of the contact is reduced, and the temperature rise of the circuit breaker is too high. Shorten the service life of the circuit breaker, reduce the reliability, and thus reduce the short-time withstand current, reduce the range of selective protection, reduce or invalidate the accuracy of the poor fit; and the structure is too compact due to the increase of parts. This makes installation difficult and is not easy to automate.

Therefore, there is a need for an improved circuit breaker contact system and circuit breaker.

Summary of the invention

In order to effectively solve the above-mentioned one or more defects existing in the prior art, the present invention provides a circuit breaker contact system and a circuit breaker, which can increase the final pressure value of the circuit breaker contact system, and can overcome the short circuit current generated. The greater electrical repulsive force, as well as optimizing the structure of the circuit breaker contact system, and controlling one or more of the circuit breaker contact system and the temperature rise of the circuit breaker.

In order to achieve the above object, the present invention adopts the following technical solutions:

According to an aspect of the present invention, a circuit breaker contact system includes: a contact holder; a slewing support shaft; a bus bar; and a plurality of conductive sheet groups, each of the conductive sheet groups including two or three a conductive sheet, each of the conductive sheets is provided with a contact, and the plurality of conductive sheets are arranged side by side And the slewing support shaft is rotatably supported on the contact holder, so that the plurality of contacts form a contact surface capable of contacting the outer conductor and conducting electricity; and the flexible connecting member has two ends respectively The plurality of conductive sheets and the bus bar are electrically connected; wherein two adjacent ones of the conductive sheet groups have a first gap between each of the two conductive sheets in each of the conductive sheet groups There is a second gap, and the first gap is larger than the second gap, and the contacts on the conductive sheets on both sides of the conductive sheet group are offset from each other in the arrangement direction of the conductive sheets.

By changing the gap between the original conductive sheets to be the same so that the gap between adjacent conductive sheet groups is larger than the gap between adjacent conductive sheets in each conductive sheet group, the conductive sheet and the contact can be effectively increased. The number of points optimizes the structure of the circuit breaker contact system, thereby increasing its current carrying capacity, improving the resistance of the circuit breaker contact system to the rated short-time withstand current, and improving the overall conductivity of the circuit breaker contact system and The current carrying capacity avoids the problem of increased temperature rise of the contact system caused by the repulsion between the conductive sheet and the outer conductor due to short-time withstand current.

And since the contacts on the conductive sheets on both sides of the conductive sheet group are offset away from each other in the arrangement direction of the conductive sheets, the plurality of contacts in each of the conductive sheet groups are formed to be predetermined with each other The gap can increase the air gap in each conductive sheet group on the one hand, improve the fluidity of the air around each contact in the conductive sheet group, and facilitate the heat dissipation of the contact when the circuit breaker is in the working state, preventing the circuit breaker from being carried out. In the withstand voltage test, since the gaps between the contacts on the plurality of conductive sheets in one conductive sheet group are too small, the contacts are welded and the silver is precipitated, causing the conductive sheets to stick together, resulting in the actual conductive sheets. The number of reductions causes the circuit breaker to fail or the test fails, and the non-derating index of the circuit breaker in a high temperature environment is improved, thereby reducing the temperature rise of the circuit breaker.

According to an aspect of the invention, the conductive sheet has a contact setting surface for connecting the contacts, and a contact arrangement surface of the conductive sheets on both sides of the conductive sheet group is arranged in an arrangement direction of the conductive sheets Offset the settings away from each other. The contact is biased by means of contact setting surface offset, so that the structure of the conductive sheet is ensured while avoiding contact welding.

According to an aspect of the invention, a first isolation portion and a second isolation portion are further disposed, the first isolation portion being located between adjacent conductive sheet groups to maintain the first between the adjacent conductive sheet groups The gap is located between adjacent conductive sheets in the conductive sheet group to maintain a second gap between the adjacent conductive sheets. Adjacent by providing a first partition and a second partition The first gap and the second gap are respectively maintained between the conductive sheet group and the adjacent conductive sheets to provide a positional and lateral support effect on the conductive sheets to ensure structural stability of the conductive sheets during contact with the external conductors.

According to an aspect of the invention, the first partition and/or the second partition include a boss formed on the conductive sheet or a separately provided spacer. The first isolation portion and the second isolation portion are provided in various forms, and the installation space of the conductive sheets in the circuit breaker contact system is increased while ensuring that the conductive sheets are effectively supported without being in contact with the external conductors. A tilting phenomenon occurs.

According to an aspect of the invention, the busbar is provided with a current deflection section capable of deflecting a direction of current flowing through the busbar to generate a contact for the flexible connector with the conductive sheet facing the exterior The force of the conductor's motion. Increase the contact pressure between the conductive sheet and the outer conductor.

According to an aspect of the invention, the current deflection section is an inclined portion provided at a portion of the busbar adjacent to the flexible connector. The inclined portion formed by the busbar body constitutes a current deflecting section, so that the busbar generates a force for moving the contact of the conductive strip toward the outer conductor to the flexible connecting member, and the structure of the busbar is simple and convenient to process. And reduce costs.

According to an aspect of the invention, the current deflection section is formed by a through groove formed in the busbar, and the through groove extends in a direction parallel to the contact surface. By forming the through slot, the current deflection of the busbar is facilitated to form an appropriate tilt angle, so that the biased current generates a strong electric repulsion force to the flexible connector to urge the conductive sheet and the contact to move toward the outer conductor.

According to an aspect of the invention, the through groove has a V-shaped or U-shaped cross section. The inclination of the current deflection segment thus formed is more advantageous for the biased current to generate a stronger electric repulsive force to the flexible connector.

According to an aspect of the invention, the depth of the through groove is set to be 1/2 to 2/3 of the thickness of the bus bar area. The biased current is generated in the through-groove area of the busbar to generate a strong electrical repulsive force to the flexible connector, thereby providing a large electrical repulsive force for the flexible connector.

According to an aspect of the invention, the through groove includes a plurality of through grooves disposed on the bus bar in a current direction, and adjacent two of the through grooves are located on opposite sides of the bus bar and are staggered from each other. The flexible connector is subjected to a plurality of superimposed electrical repulsive forces to increase the contact pressure between the conductive sheet and the outer conductor.

According to an aspect of the invention, the circuit breaker contact system further includes: an elastic member correspondingly disposed between each of the conductive sheet groups and the contact support. The use of a set of conductive sheets to share an elastic member increases the installation space of the elastic members, reduces the winding ratio of the elastic members, improves the performance of the elastic members, and avoids premature fatigue failure of the elastic members.

According to another aspect of the present invention, a circuit breaker is provided, the circuit breaker including the circuit breaker contact system.

DRAWINGS

The following drawings of the present application are hereby incorporated by reference in its entirety in its entirety herein in its entirety herein in its entirety The embodiments shown in the drawings and their description are to explain the principles of the invention. In the drawing:

1 is a schematic view showing the overall structure of a circuit breaker contact system according to an embodiment of the present invention;

2 is a schematic exploded view showing a circuit breaker contact system;

Figure 3 is a partial structural view showing a circuit breaker contact system;

4 is a front perspective view showing a set of conductive sheets of a circuit breaker contact system;

Figure 5 is a perspective view showing the sandwiched sheet of the set of conductive sheets of Figure 4;

Figure 6 is a schematic side view showing the conductive sheet of Figure 5;

Figure 7 is a schematic view showing the structure of the busbar of the circuit breaker contact system;

Figure 8 is a schematic view showing another busbar structure of the circuit breaker contact system;

Figure 9 is a schematic view showing another busbar structure of the circuit breaker contact system;

Figure 10 is a partial cross-sectional view showing the structure of the circuit breaker contact system in an open state;

Figure 11 is a partial cross-sectional view showing the closing state of the circuit breaker contact system;

Figure 12 is a schematic diagram showing the operation of the circuit breaker contact system.

detailed description

Features and exemplary embodiments of various aspects of the invention are described in detail below. In the following detailed description, numerous specific details are illustrated and However, it will be apparent to those skilled in the art that the present invention may be practiced without some of the details. The following description of the embodiments is merely A better understanding of the invention is provided by the description of the embodiments of the invention. The present invention is not limited to any specific configuration as set forth below, but is intended to cover any modifications, substitutions and improvements of the structure and components of the present invention without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the technical solutions of the present invention.

For a better understanding of the present invention, the circuit breaker contact system and circuit breaker of the illustrated embodiment of the present invention are described in detail below with reference to FIGS. 1-12.

Referring to FIG. 1 , a schematic overall structural diagram of a circuit breaker contact system according to an embodiment of the present invention is shown. The circuit breaker contact system 100 is disposed in a circuit breaker for controlling voltage/current in a circuit breaker breaking/closing circuit. The utility model has the protection characteristic of the delay action, that is, the short-circuit current can bear the impact caused by the short-circuit current in a short time before the short-circuit current is cut off, and when the failure of the lower-end branch is ensured, the fault is removed by the lower-end circuit breaker as much as possible, and the power-off is reduced. Range, reduce losses.

Specifically, the circuit breaker contact system 100 has a plurality of conductive sheets 20 (also commonly referred to as contacts or fingers), the plurality of conductive sheets 20 being electrically coupled to the busbar 40 by a flexible connector 30, and a plurality of conductive sheets 20 In a side-by-side arrangement and rotatably disposed on the contact holder 10 via a slewing support shaft 80 (shown in FIG. 2), each of the conductive sheets 20 is provided with a contact 21 (also commonly referred to as a movable contact or silver). Contact), the contact surface formed by the plurality of contacts 21 can be electrically connected or disconnected from the external conductor, so that the circuit breaker can be in an energized or de-energized state.

The contact holder 10 is of a frame type structure and is made of an insulating material, and can serve as an insulating support for the plurality of conductive sheets 20 fixed thereto. The two ends of the contact holder 10 are respectively connected through the side plates and are fixed by screws. The

auxiliary fixing plates

51, 52, of course, the

auxiliary fixing plates

51, 52 can also be connected to the contact holder 10 by other means or by other structures to serve as the

auxiliary fixing plates

51, 52. The two ends of the slewing support shaft 80 are sandwiched between the two

auxiliary fixing plates

51 and 52 through the predetermined axial holes 13 of the two

auxiliary fixing plates

51 and 52 respectively. Cooperating the

auxiliary fixing plates

51, 52 with the contact holder 10 to provide a support limit for the plurality of conductive sheets 20.

The busbar 40 and the contact carrier 10 are also fixed in the circuit breaker by a mounting bracket 60, and the mounting bracket 60 and the contact bracket 10 are rotatably connected by a rotating shaft 53. The plurality of conductive sheets 20 and the bus bars 40 are electrically connected by a flexible connecting member 30. The flexible connector 30 is a soft connector The connection structure, preferably a copper connection line or other soft connection structure composed of the same, is preferably connected to the plurality of conductive sheets 20 and the bus bars 40 by soldering to ensure good electrical conductivity. The transition between the plurality of conductive sheets 20 and the bus bar 40 is realized by a soft connection transition.

Of course, the present invention does not limit the connection manner between the flexible connecting member 30 and the conductive sheet 20 and the bus bar 40, and the shape thereof. For example, it is also possible to provide a connecting hole on the flexible connecting member 30, and additionally in the bus bar 40 and the conductive A connecting pin is disposed on the corresponding connecting hole of the piece 20, and is connected and fixed by a connecting pin and a connecting hole and screwed.

The circuit breaker contact system further includes a contact shield 70, which is a U-shaped plate-like structure, and is formed in contact with the contacts 21 of the plurality of conductive sheets 20 so as not to hinder the operation of the conductive sheet 20. At a position below the surface, the contact shield 70 is fixedly connected by a predetermined screw hole on the

auxiliary fixing plates

51 and 52 by screws, thereby further providing insulation and protection for the plurality of conductive sheets 20, of course, the contacts The number of the shields 70 to be provided is not limited and may be one or more.

Referring to FIG. 2, an exploded perspective view of the circuit breaker contact system of the embodiment of the present invention is shown. As shown, the conductive sheet 20 is a sheet-like structure, and the head is bent toward the contact holder 10 side to form a concave portion. The contact position of the contact 21 with the outer conductor is disposed at an end surface below the head of the conductive sheet 20. The plurality of contacts 21 are arranged side by side to form a contact surface, and the conductive sheet 20 is formed by the contact surface formed by the contact 21. The outer conductor contacts the conductive or separates the power.

A shaft hole 24 for the slewing support shaft 80 is inserted through the bottom portion of each of the conductive sheets 20, and a plurality of conductive sheets 20 are disposed on the contact holder 10 through the slewing support shaft 80. The head is housed in a U-shaped space formed by the contact holder 10 and the side plates connected thereto, and is rotatable about the swing support shaft 80. Of course, the present invention does not limit the number and shape of the conductive sheets 20, and can be adjusted accordingly according to the needs of use and the installation position.

Referring to FIG. 3, a partial structural schematic diagram of a circuit breaker contact system according to an embodiment of the present invention is shown, wherein a plurality of conductive sheets 20 are configured as a plurality of conductive sheet groups 201. In the present embodiment, it is exemplarily shown that the conductive sheet group 201 includes two conductive sheets 20, and a first gap is formed between two adjacent conductive sheet groups 201, and adjacent ones of each of the conductive sheet groups 201 A second gap is formed between the conductive sheets 20, and the first gap is larger than the second gap. Of course, the number of the conductive sheets 20 in the conductive sheet group 201 is not limited thereto, and may be adaptively increased according to actual application requirements. Less adjustment, for example, when the number of conductive sheets in the contact system is singular, the plurality of conductive sheets may also be configured such that two conductive sheets constitute one conductive sheet group and/or three conductive sheets form a conductive sheet group. And a form in which a single conductive sheet and a plurality of conductive sheets are mixedly arranged.

The circuit breaker contact system 100 further includes a first isolation portion and a second isolation portion disposed between two adjacent conductive sheet groups 201 to maintain a first gap between adjacent conductive sheet groups 201 The second spacer is disposed between the adjacent two conductive sheets 20 in each of the conductive sheet groups 201 to maintain a second gap therebetween. By arranging the first spacer portion and the second spacer portion to separate the adjacent conductive sheets 20 and the adjacent conductive sheet groups 201, the structure of the conductive sheet 20 is supported to prevent the roll from occurring and prevent the work from being performed. The heat is accumulated in the middle conductive sheet 20. Exemplarily, the first isolation portion is a partition 11 and the second isolation portion is a clip 22, and the partition 11 is made of a thermosetting plastic having high temperature resistance, arc resistance and high structural strength.

The clip 22 is disposed between the two conductive sheets 20 in each of the conductive sheet groups 201. The clip 22 is shaped to be the same shape as the conductive sheet 20, and has a thickness smaller than the thickness of the spacer 11, for use in assisting The separator 11 together prevents the conductive sheet 20 from being skewed due to continuous temperature rise during operation, resulting in a problem that the contact force with the outer conductor is reduced.

By arranging a plurality of conductive sheets 20 as a plurality of conductive sheet groups 201, and replacing the separator between adjacent conductive sheets 20 in each of the conductive sheet groups 201 with a thinner clip 22 while retaining each two The partition plate 11 between the conductive sheet groups 201 can increase the installation space of the conductive sheets 20, thereby increasing the number of the conductive sheets 20, and optimizing the setting of the circuit breaker contact system so that the conductive sheets can be overcome in contact with the external conductors. The large electric repulsion effectively improves the short-term withstand performance of the circuit breaker contact system. In addition, by replacing the spacer 11 with the clip 22, the plurality of conductive sheets 20 in the conductive sheet group 201 have a thinner total thickness, and it is not necessary to provide a separate elastic member for each of the conductive sheets 20, but to make a conductive sheet. The plurality of conductive sheets 20 in the group 201 share the elastic members. For example, in the present embodiment, each of the conductive sheet groups 201 provides an elastic force using one/group of springs.

By retaining the partition 11 between the adjacent conductive sheet groups 201, the conductive sheets 20 arranged in parallel can be provided with a solid and reliable fixing and limiting action in the lateral direction with the aid of the clips 22, thereby ensuring a plurality of conductive The stability of the sheet structure solves the problem that the contact force between the conductive sheet and the outer conductor in contact with the conductive sheet is reduced due to the roll of the conductive sheet, thereby improving the reliability of the contact system of the circuit breaker. Further, in order to optimize the space, the structure of the circuit breaker contact system is simplified, and the conductive sheet 20 is made The spacer 11 is preferably supported on the contact holder 10 in a unitary structure.

The function of the first isolation portion and the second isolation portion in the circuit breaker contact system is to limit the support of the conductive sheet. In the illustrated embodiment of the invention, the first isolation portion is the partition 11 and the second isolation portion is the clamp. Sheet 22. However, it should be noted that the structures of the first isolation portion and the second isolation portion are not limited thereto. For example, the first isolation portion and the second isolation portion may also be protrusions formed on the conductive sheet 20 or in a circuit breaker. Other spacers that are separately provided in the contact system. It can also support the plurality of conductive sheets laterally to ensure the stability of the plurality of conductive sheet structures, and avoid the problem that the contact force is reduced during the process of contacting the outer conductors with the conductive.

Further, please refer to FIG. 4, which is a schematic structural view of the conductive sheet group 201 of the embodiment of the present invention, and FIG. 5 is a schematic perspective view of the conductive sheet group 201 of the embodiment of the present invention. It is shown that the conductive sheet 20 is connected to the contact 21 through the contact setting surface 25 formed thereon, and the contacts on the conductive sheets 20 on both sides of the conductive sheet group 201 are apart from each other in the direction in which the plurality of conductive sheets 20 are arranged. In the present embodiment, the contacts 21 on the two conductive sheets 20 in each of the conductive sheet groups 201 are respectively biased toward the partition 11 on both sides by a predetermined distance, as shown in FIG. A schematic view of the lateral structure of the conductive sheet of the embodiment of the present invention, the two conductive sheets 20 of each of the conductive sheet groups 201 are formed by stamping and forming the contact setting faces 25 toward the partition plates 11 on both sides thereof ( That is, away from each other, a predetermined distance (shown in FIG. 3) is offset, so that the contacts 21 formed on the contact setting surface 25 are offset together so that a predetermined gap is formed between the adjacent contacts 21. . In order to make the air flow around the contacts better, the conductive sheet structure is simpler, and it is preferable to uniformly distribute the contacts 21 at the contact faces formed on the plurality of conductive sheets 20. The predetermined distance may be set according to a gap that needs to be retained between the contacts of the circuit breaker contact system in actual operation, and by offsetting the contact by a predetermined distance, a predetermined gap may be maintained between adjacent contacts. In the present embodiment, the contact setting faces 25 of the conductive sheets 20 are biased by a predetermined distance toward each other, so that the contacts 21 of each of the conductive sheet groups 201 form a gap with each other to facilitate air flow, in other implementations. In the example, a plurality of contacts in each of the conductive sheet groups may be biased in other manners to facilitate good air flow between them.

By adopting a uniform contact, the air gap at the contact 21 of each conductive strip group 201 can be increased, and the air flow can be improved, thereby controlling the temperature rise in the operation of the circuit breaker contact system. It is beneficial to the heat dissipation of the contact 21, thereby improving the non-derating index of the circuit breaker in a high temperature environment. In addition, when the circuit breaker performs the short-time withstand test, the two conductive sheets 20 are prevented when the gap between the two conductive sheets 20 in one conductive sheet group 201 is too small, causing the silver to be deposited when the contacts 21 are welded. In the adhesion problem, the relative amount of the conductive sheets 20 is reduced to cause the test termination to occur, and the short-time withstand performance of the circuit breaker contact system is improved.

Of course, the uniform distribution of the above contacts is not absolute. In the present embodiment, the conductive sheets 20 on both sides of the conductive sheet group 201 are biased in order to realize the adjacent contacts 21 in each of the conductive sheet groups 201. Forming a predetermined gap therebetween ensures air flow around the contact 21. And in the present embodiment, only the case where the conductive sheet group 201 has two conductive sheets 20 is schematically shown. In other embodiments, for example, when there are three conductive sheets in each conductive sheet group, only conductive The contacts on the conductive sheets on both sides of the chip group are offset by a predetermined distance toward the spacers on both sides thereof, and the conductive sheets in the middle of the conductive sheet group are not subjected to the offset processing, and the object of the present invention can also be achieved. It is achieved that a predetermined gap is maintained between adjacent contacts in the conductive sheet group. Of course, when each conductive sheet group includes three conductive sheets, the predetermined gaps held between adjacent ones of the contacts may be the same or different.

The busbar 40 (shown in FIG. 2) may be a copper row or an aluminum row that provides electrical connection between the circuit breaker and the switches in each shunt circuit, one end of which is cylindrical for connection with external terminals and the other end is plate Shape or block structure. Of course, the shape of the busbar 40 is not limited thereto. In other embodiments, the busbar 40 may also be a unitary block structure.

A current deflection section 44 is disposed at the busbar 40 for deflecting a direction of current flow through the current deflection section 44, the current in the deflection direction being capable of exerting a force on the flexible connector 30 that moves away from the busbar 40. The flexible connector 30 is configured to drive the plurality of conductive sheets 20 to move, thereby increasing the contact force between the plurality of conductive sheets 20 and the outer conductor, that is, increasing the final pressure between the contacts, thereby causing the plurality of conductive sheets 20 to be external During the contact process of the conductor, the large electric repulsion can be overcome and the short-time withstand current of the circuit breaker can be improved.

Specifically, referring to FIG. 7, a schematic diagram of a busbar structure of a circuit breaker contact system of an embodiment of the present invention is shown. As shown, in the present embodiment, the current deflecting section 44 is an inclined portion provided for the body of the busbar 40, the inclined portion is disposed at a portion of the busbar 40 adjacent to the flexible connecting member 30, and the inclined portion and the flexible connecting member 30 are The angle formed between the two is less than 90 degrees, and the current flowing into the bus bar 40 from the flexible connecting member 30 is deflected in a direction flowing through the inclined portion, and the flexible connecting member 30 is generated. The electric repulsion force is moved toward the direction away from the busbar 40, thereby causing the contact portions of the plurality of conductive sheets 20 to rotate around the slewing support shaft 80 (shown in FIG. 12) toward the side closer to the busbar 40.

Further, referring to Fig. 8, another busbar structure of an embodiment of the present invention is shown. As shown, the bus bar 40 forms a current deflecting section 44 by opening a through groove 41 at a bottom surface thereof adjacent to the flexible connecting member 30. The cross-sectional shape of the through groove 41 is an inverted V shape, and the extending direction of the through groove 41 is parallel to The contact faces formed by the plurality of contacts 21 cause the current flowing into the bus bar 40 from the flexible connector 30 to deflect in a direction flowing through the region of the through slot 41, thereby generating a repulsive force on the flexible connector 30, so that the flexible connector 30 is provided. Moving away from the busbar 40, since the plurality of conductive sheets 20 are connected to the flexible connecting member 30 and rotatably fixed to the contact holder 10, the flexible connecting member 30 connected to the lower ends of the plurality of conductive sheets 20 is leveraged. The contact portions of the plurality of conductive sheets 20 may be caused to rotate around the swing support shaft 80 toward the side closer to the bus bar 40, thereby increasing the contact force (ie, the contact final pressure) between the plurality of conductive sheets 20 and the outer conductor. Of course, the form of the through groove 41 is not limited thereto. In other embodiments of the present invention, the cross-sectional shape of the through groove 42 may be set to an inverted U shape or other shape that can form a current deflection section at the bus bar 40. And the through slot 41 may not be opened at the bottom surface of the busbar 40, and the arrangement may be such that the current connecting the busbar 40 is biased toward the segment 44 so that the flexible connector 30 is subjected to the force moving away from the busbar 40. .

Referring to FIG. 9, a schematic diagram of another busbar structure according to an embodiment of the present invention. As shown in the figure, in another embodiment of the present invention, the busbar 40 is provided with a plurality of through slots. Specifically, the busbar 40 is disposed with one or more passes behind the through slot 41 along the flow direction of the current therein. Slots and stagger the channels. The so-called opposite staggered arrangement, that is, the case shown in FIG. 9, the through groove 43 is opened at the upper end surface of the bus bar 40, so that the cross-sectional shape of the through groove 41 and the through groove 43 are formed to face each other in opposite directions, and The groove walls adjacent to the groove 43 are arranged in parallel to facilitate better flow of current in the busbar. With this configuration, the flexible connector 30 can be subjected to a plurality of superimposed electrical repulsive forces, increasing the amplitude of the movement of the flexible connector 30 away from the busbar 40, and further increasing the plurality of conductive sheets 20 connected thereto along the slewing support. The rotational force of the shaft 80 rotating toward the busbar 40 side can further increase the contact force between the plurality of conductive sheets 20 and the outer conductor.

In Fig. 9, only one through slot 43 is provided behind the through slot 41. Of course, a plurality of through slots may be provided behind the through slot 41 to form a plurality of current deflecting segments 44 for diverting current flowing through the busbar 40. The contact force between the plurality of conductive sheets 20 and the outer conductor can be further increased.

Further, in order to increase the electric repulsion force generated by the current flowing through the current deflection section 44 to the flexible connecting member 30 as much as possible, the depth of the through groove 41 is set to be 1/2 of the thickness at the area where the busbar 40 is located. 2/3, as shown in Figure 8. When the contact system is subjected to the short-circuit current, when the current flows through the busbar 40, the current flows throughout the busbar 40 and flows toward the flexible conductive member 30. (Because of the alternating current, the current has two flow directions of positive and negative, that is, from the flexible conductive member. 30 flows to the busbar 40 or from the busbar 40 to the flexible conductive member 30, but the direction of the electrical repulsive force generated by the two directions is the same for the flexible conductive member 30. When the current flows through the front end 46 of the busbar, the current line formed is initially Compression, in order to produce a better electric repulsive force, a through slot 41 is added at the busbar 40, and the through slot 41 reduces the thickness of the region of the busbar 40 where it is located, so that the current line is compressed again, and the magnetic line is strengthened again. The depth of the groove 41 is set to be 1/2 or more of the thickness of the region where the bus bar 40 is located, and can function to recompress the current line.

By controlling the thickness of the region of the busbar 40 where the through slot 41 is located, that is, controlling the opening depth of the through slot 41, the maximum current carrying capacity at the region of the busbar 40 where the through slot 41 is located is smaller than the maximum circulating current at the front end 46 of the busbar. The current prevents the current carrying capacity at the front end 46 of the busbar from being excessively increased, and the heat generation of the busbar increases, which causes the heat generated by the circuit breaker body to increase, thereby ensuring that the heat capacity of the busbar 40 is small and does not cause heat to seriously affect the overall performance of the circuit breaker.

And since the depth of the through groove 41 is set to this range, the angle formed between the current biasing portion 44 and the flexible conductive member 30 allows current to flow in the bus bar 40, and the horizontal flow direction when flowing through the region where the through groove 41 is located It is effectively changed to flow in the oblique direction of the two parallel slopes along the current deflection section 44, and the resulting current deflection direction can generate a large electric repulsive force to the flexible connector 30, enabling the flexible connector 30 to be a plurality of conductive sheets. 20 provides greater rotational force to overcome greater electrical repulsion during contact of the plurality of conductive sheets 20 with the outer conductor.

Further, in order to ensure the current flow in the busbar 40, and to make the current form a better deflection direction, and to increase the current flowing through the current deflection section 44 to the electrical repulsive force generated by the flexible connector 30, The thickness of the current deflection section 44 is equally thick. By setting the current deflection section 44 to an equal thickness, the current flowing through the current deflection section 44 can maintain good flow performance without excessive loss, while attenuating the biased current to the flexible connector 30. Repulsive force.

Further, in order to cause the current to generate a sufficiently large electric repulsive force to the flexible connector at the current deflection section 44, the thickness of the current deflection section 44 may also be set to be less than or equal to the thickness of the connection portion 45 of the busbar 40 near the flexible connector 30. And maintaining a small distance between the disposed position of the through groove 41 and the flexible connecting member 30. Because the current is biased toward the segment 44 through a relatively large current, the strength of the magnetic field generated on the surface of the busbar 40 is inversely proportional to the distance between the through slot 41 and the flexible connector 30. Therefore, in order to generate a large repulsive force to the flexible connector 30, The initial position of the current deflection section 44 can be set to coincide with the end position of the flexible connector 30 on the busbar 40, thereby creating a greater electrical repulsive force to the flexible connector 30.

Referring to FIG. 10, a partial structural cross-sectional view showing the opening state of the circuit breaker contact system of the embodiment of the present invention is shown. The corresponding plurality of conductive sheet groups 201 of the circuit breaker contact system 100 are respectively provided with elastic members, and the elastic members are respectively disposed. Abutting between each of the conductive sheet groups 201 and the contact holders 10, the conductive sheets 20 are provided with a contact force during the conductive process in which the plurality of conductive sheets 20 are in contact with the outer conductors.

The elastic member is preferably a coil spring 90. Specifically, a recess formed by the two conductive sheets 20 in each of the conductive sheet groups 201 and the clip 22 sandwiched between the two conductive sheets 20 is provided to accommodate the coil spring 90. The support groove 23 (please refer to FIG. 5 together), one end of the coil spring 90 abuts against the support groove 23, and the other end abuts against the groove 12 provided by the contact bracket 10 corresponding to the support groove 23, and The partition plate 11 on both sides of the conductive sheet group 201 is a coil spring 90 disposed therebetween to provide a limit function from both sides, and an elastic member is shared by each conductive sheet group 201 to increase the installation space of the elastic member, thereby making the elastic member The winding ratio is in a preferred range.

The above structure doubles the installation space of the coil spring 90 in the circuit breaker contact system 100, so that the winding ratio of the coil spring 90 is doubled compared to the prior art spring, thereby enhancing the structure of the coil spring 90. Strength, which greatly increases the service life and fatigue resistance.

Further, the elastic members at each of the conductive sheet groups 201 can also be disposed by arranging or arranging two coil springs 90 having different diameters to further enhance the service life of the elastic members and withstand fatigue. Enables the circuit breaker contact system to overcome greater electrical repulsion.

At the same time, each of the conductive sheet sets 201 is urged against the contact holder 10 by an elastic member, so that the position of the support groove 23 is generally raised upward, so that the coil spring 90 supports the shaft by rotation. 80 is centered on the force arm of the conductive sheet 20 to lengthen, thereby increasing the contact pressure between the conductive sheet 20 and the outer conductor by increasing the moment of the force provided by the coil spring 90 without increasing the final pressure. Thereby the circuit breaker contact system 100 is able to overcome a greater electrical repulsion.

Of course, the structure of the elastic member is not limited thereto. For example, the elastic member may be provided as a torsion spring or other elastic structural member that can provide a force to the plurality of conductive sheets 20.

When the circuit breaker contact system 100 is in the open state, the two ends of the coil spring 90 abut against the support groove 23 and the groove 12 and are in a micro-compression state, and the plurality of conductive sheets 20 and the outer conductor are separated and de-energized. Referring to FIG. 11, a partial cross-sectional structural view of the circuit breaker contact system in the closed state of the embodiment of the present invention is shown. As shown in the figure, when the circuit breaker contact system 100 needs to work on the current, the contact holder 10 can be rotated by the shaft 53 (shown in FIG. 1) as a central axis by the closing operation, so that the coil spring 90 is flanked at both ends. The plurality of conductive sheets 20 are elastically applied against the support grooves 23 and the grooves 12 and in a fully compressed state to maintain good contact between the plurality of conductive sheets 20 and the outer conductor.

Referring to FIG. 12, a schematic diagram of the working principle of the circuit breaker contact system according to an embodiment of the present invention is described. The following describes the working principle and effect of the through slot 41 in combination with the working principle diagram.

After the switch is closed, the current flow direction in the circuit breaker contact system 100 is as shown in the figure. When the circuit breaker contact system 100 encounters a short circuit current (or is called an abnormal high current), the current enters the busbar 40. When flowing through the current deflection section 44, the direction is deflected, and even if the direction of current flow becomes a parabolic-like bottom-up flow direction at the current deflection section 44, the current flowing through the current deflection section 44 will be flexible. The connector 30 produces an electrical repulsion (Lorentz force).

At the same time, an electric compensation force (Lorentz force) is generated when the current passes through the flexible connecting member 30 itself, and the force received by the flexible connecting member 30 is superimposed due to the same electric compensation force and electric repulsion force generated by the flexible connecting member 30. The two superimposed forces move the flexible connector 30 in a direction away from the busbar 40. Since the busbar 40 and the contact carrier 10 are fixed by the holder 60, the flexible connector 30 generates the lower ends of the plurality of conductive sheets 20. In the pulling force, the plurality of conductive sheets 20 are disposed on the slewing support shaft 80. Due to the principle of the lever, the portions of the plurality of conductive sheets 20 disposed above the slewing support shaft 80 are rotated around the slewing support shaft 80 toward the side of the busbar 40, thereby increasing The contact force between the plurality of contacts 21 and the outer conductor thereon, which in turn can increase the end of the circuit breaker contact system The pressure causes the circuit breaker contact system 100 to overcome the large electrical repulsion generated at the contact surface of the outer conductor with the conductive sheet 20 due to the short circuit current.

A circuit breaker is also provided in accordance with another embodiment of the present invention, including the circuit breaker contact system 100 described above. The structure and advantages thereof have been described above and will not be described herein.

Claims

A circuit breaker contact system comprising:

Contact bracket

Slewing support shaft;

Busbar; and

a plurality of conductive sheet groups, each of the conductive sheet groups including two or three conductive sheets, each of the conductive sheets being provided with a contact, the plurality of conductive sheet groups being arranged side by side and passing the slewing support shaft Rotatablely supported on the contact holder such that a plurality of the contacts form a contact surface capable of contacting the outer conductor in electrical conduction;

a flexible connector, the two ends of the flexible connector are electrically connected to the plurality of conductive sheets and the bus bar, respectively;

Wherein two adjacent conductive sheet groups have a first gap therebetween, a second gap is formed between two adjacent conductive sheets in each of the conductive sheet groups, and the first gap is larger than the second gap In the gap, the contacts on the conductive sheets on both sides of the conductive sheet group are offset from each other in the arrangement direction of the conductive sheets.
The circuit breaker contact system according to claim 1, wherein said conductive sheet has a contact setting surface for connecting said contacts, and a contact setting surface of said conductive sheets on both sides of said conductive sheet group They are offset from each other in the arrangement direction of the conductive sheets.
The circuit breaker contact system of claim 1 further comprising a first isolation portion and a second isolation portion, said first isolation portion being located between adjacent ones of said conductive sheets to cause said adjacent conductive sheets A first gap is maintained between the groups, and the second spacer is located between adjacent conductive sheets in the conductive sheet group to maintain a second gap between the adjacent conductive sheets.
The circuit breaker contact system of claim 3, wherein the first partition and/or the second partition comprises a boss formed on the conductive sheet or a separately disposed spacer.
The circuit breaker contact system of claim 1 further comprising:

And an elastic member disposed correspondingly between each of the conductive sheet groups and the contact holder.
A circuit breaker, wherein the circuit breaker includes the circuit breaker contact system of any one of claims 1 to 5.