Contact system and circuit breaker

Abstract

A contact system comprises a rotating shaft and at least one moving contact, the rotating shaft comprises at least one driving piece, a pivot is arranged in the driving piece, the pivot is arranged in the axial direction of the rotating shaft, the moving contact is rotatably installed on the pivot, at least one elastic piece is installed between the moving contact and the driving piece, and two sliding grooves are formed in the driving piece. The length direction of the two sliding grooves is perpendicular to the axial direction of the rotating shaft, the two ends of the pivot are arranged in the two sliding grooves respectively, the moving contact is provided with a first locking part, the driving piece is internally provided with a second locking part, and the moving contact is driven by the electric repulsive force to rotate to the position corresponding to the first locking part and the second locking part relative to the driving piece. The elastic piece and / or the electric repulsive force drive the pivot to slide in the sliding groove, so that the first locking part and the second locking part abut against each other and are locked. The anti-falling device is simple in structure and exquisite in design, and the anti-falling effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a contact system and a circuit breaker. Background Technology

[0002] As a branch-level distribution device in power distribution systems, molded case circuit breakers (MCCBs) require increasingly higher breaking capacities due to the continuous increase in power grid capacity and the need for centralized power distribution. Therefore, current-limiting contact structures are widely used in MCCBs. However, the repulsive force of the current-limiting contact structure depends on the current flowing between the contacts. When the current increases to a certain value, the moving and stationary contacts begin to separate under the action of electrodynamic repulsive force. After being separated, the contacts quickly return to their original position under the action of the contact spring, resulting in contact drop. Contact drop can easily cause the electric arc between the contacts to continue burning, or the arc to reignite after being extinguished. This will cause greater burn damage to the circuit breaker contacts and other internal components. Utility Model Content

[0003] The purpose of this utility model is to solve at least one problem in the prior art and to provide a contact system and circuit breaker with a function of preventing the moving contact from falling after being electrically repelled.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] In a first aspect, this application provides a contact system including a rotating shaft and at least one movable contact. The rotating shaft includes at least one driving member, and a pivot is disposed within the driving member. The pivot is disposed along the axial direction of the rotating shaft. The movable contact is rotatably mounted on the pivot. At least one elastic member is installed between the movable contact and the driving member. Two sliding grooves are disposed within the driving member, and the length direction of the two sliding grooves is perpendicular to the axial direction of the rotating shaft. The two ends of the pivot are respectively disposed within the two sliding grooves. A first locking part is disposed on the movable contact, and a second locking part is disposed within the driving member. An electric repulsive force drives the movable contact to rotate relative to the driving member to a position corresponding to the first locking part and the second locking part. The elastic member and / or the electric repulsive force drives the pivot to slide within the sliding groove, so that the first locking part and the second locking part abut and lock together.

[0006] In one possible implementation, the moving contact is provided with a rotating part, the rotating part including an upwardly protruding first arc-shaped sliding part and a downwardly protruding second arc-shaped sliding part, the first arc-shaped sliding part and the second arc-shaped sliding part are arranged opposite to each other and form a second through hole in the middle;

[0007] The first locking part is an arc-shaped groove on the upper surface of the first arc-shaped sliding part, and the second locking part is a limiting shaft arranged in the sliding groove along the axis of rotation. The limiting shaft is located above the moving contact and abuts against the first arc-shaped sliding part. The limiting shaft can be partially placed in the arc-shaped groove to achieve matching and limiting.

[0008] In one possible implementation, the upper edges of the two sliding grooves of the drive member are provided with two arc-shaped grooves, and the first arc-shaped sliding part abuts against the limiting shaft, so that the two ends of the limiting shaft are respectively fixed in the two arc-shaped grooves.

[0009] In one possible implementation, the rotating part includes an upwardly protruding first arc-shaped sliding part and two downwardly protruding second arc-shaped sliding parts, with the first arc-shaped sliding part disposed between the two second arc-shaped sliding parts.

[0010] In one possible implementation, the moving contact includes a contact plate and a force-bearing plate, the driving member includes a first through hole through which the moving contact passes, the force-bearing plate is connected to the elastic member, and the contact plate is provided with a moving contact point.

[0011] In one possible implementation, the moving contact is a flat plate structure, the contact plate and the force plate are integrally formed and bent and connected, one end of the contact plate is provided with the moving contact point, and the other end is provided with a rotating part at the connection with the force plate. The middle part of the rotating part is provided with the second through hole along the axial direction of the rotating shaft, and the pivot passes through the second through hole and is respectively installed in two sliding grooves at both ends.

[0012] In one possible implementation, a first fixing part is provided on the force-bearing plate, a second fixing part is provided on the driving member, and at least one elastic member is provided between the first fixing part and the second fixing part. In another possible implementation, the first fixing part is a boss protruding from the force-bearing plate towards the driving member, the second fixing part is a groove recessed from the driving member towards the force-bearing plate, one end of the elastic member is connected to the boss, and the other end is embedded in the groove.

[0013] In one possible implementation, the driving component includes two opposing side plates, a top plate, and a front plate. The two side plates, the top plate, and the front plate are bent and connected, forming a first through hole between the two side plates. Each of the two side plates has a support platform at its front, and the support platforms of the two side plates are spaced apart from each other. Support plates protrude from both sides of the middle of the moving contact to form support plates. The support plates on both sides of the moving contact are mounted on the support platforms. The two side plates are spaced apart at their rear ends, and the upper edge of the middle of the sliding groove is provided with an arc-shaped groove. The front plate is provided with two second fixing parts. The first through hole has a movable gap, and the moving contact can move up and down within the movable gap.

[0014] In one possible implementation, the rotating shaft of the contact system includes a plurality of drive members spaced apart, the plurality of drive members being integrally formed, a connecting portion being provided between the drive members, a moving contact being provided in each drive member, and the plurality of moving contacts being arranged side by side.

[0015] Secondly, this application provides a circuit breaker including the above contact system.

[0016] In one possible implementation, the circuit breaker includes at least three protection pole units. The rotating shaft of the contact system includes three integrally formed, spaced-apart driving members. A cylindrical connecting portion is provided between the driving members. Each driving member contains one moving contact. The three moving contacts are arranged side by side and correspond one-to-one with three side by side stationary contacts. The moving contacts are driven by an electric repulsive force and / or an elastic element. After rotating relative to the rotating shaft to complete locking, an external force is applied to the moving contacts, causing them to rotate in the direction of the stationary contacts. The first locking portion and the second locking portion are unlocked. Under the action of the elastic element, the pivot slides along the sliding groove to the initial position.

[0017] The contact system of this utility model includes a moving contact and a rotating shaft. The rotating shaft is provided with at least one driving member. The moving contact is installed inside the driving member. Two parallel sliding grooves are provided at intervals inside the driving member. A pivot is provided in the sliding grooves along the axial direction of the rotating shaft, with its two ends respectively located in the two sliding grooves. The pivot can slide within the sliding grooves. The moving contact is installed on the pivot and is mounted in the driving member through the pivot. The moving contact is provided with a first locking part, and a second locking part is provided in the sliding groove. The moving contact and the stationary contact are subjected to an electric repulsive force, which pushes the moving contact to rotate away from the stationary contact with the pivot as the rotation center. When the moving contact rotates to the position corresponding to the first locking part and the second locking part, the elastic element and / or the electric repulsive force drive the moving contact to move, so that the pivot can slide within the sliding groove. The first locking part and the second locking part abut against each other and lock, forming a self-locking structure, and at the same time achieving the effect of preventing the moving contact from falling. This utility model has a simple structure and ingenious design, which can effectively prevent secondary contact between the moving contact and the stationary contact, achieve the anti-drop effect, and improve the breaking capacity of the circuit breaker.

[0018] Furthermore, a rotating part is provided on the moving contact, which includes an upwardly protruding first arc-shaped sliding part and two downwardly protruding second arc-shaped sliding parts. An arc-shaped groove is provided on the first arc-shaped sliding part as a first locking part, and a limiting shaft is provided in the driving member as a second locking part. Under the action of the elastic member, the pivot is displaced relative to the sliding groove, and the limiting shaft is partially placed in the arc-shaped groove. The arc-shaped groove abuts against the limiting shaft. Under the action of the elastic member, the moving contact cannot be reset, thus preventing the moving contact from falling and causing the electric arc to continue burning or reignite.

[0019] Furthermore, the moving contact has a flat plate structure, which includes an integrally formed and bent contact plate and a force-bearing plate. A second through hole is provided in the middle of the rotating part. The pivot passes through the second through hole and is installed in the drive component. The second through hole can be formed by staggered stamping, which can reduce the cost of raw materials. The flat plate structure of the moving contact can provide a larger current-carrying area, which can meet the needs of high-ampere molded case circuit breaker products. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the moving contact and rotating shaft after installation in the contact system of this utility model;

[0021] Figure 2 This is a schematic diagram of the disassembled moving contact and rotating shaft in the contact system of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the rotating shaft in the contact system of this utility model;

[0023] Figure 4This is a schematic diagram of the structure of the moving contact in the contact system of this utility model;

[0024] Figure 5 This is a schematic diagram of the contact system of this utility model in the closed state;

[0025] Figure 6 This is a schematic diagram of the contact system of this utility model in the process of being in the repulsive state;

[0026] Figure 7 This is a schematic diagram of the structure of the contact system of this utility model, in which the moving contact is locked by the rotating shaft after being pushed open;

[0027] The reference numerals in the attached drawings include: moving contact 2; rotating shaft 1; driving element 11; pivot 12; moving contact 21; elastic element 3; sliding groove 13; first locking part 22; second locking part 14; rotating part 25; first arc-shaped sliding part 251; second arc-shaped sliding part 252; second through hole 26; arc-shaped groove 16; contact plate 23; force-bearing plate 24; first through hole 15; support platform 115; first fixing part 241; second fixing part 111; side plate 112; top plate 113; front plate 114; connecting part 17. Detailed Implementation

[0028] The specific embodiments of this utility model are further described below with reference to the accompanying drawings. The scope of protection of this utility model is not limited to the description of the following embodiments.

[0029] The circuit breaker includes a handle mechanism, an operating mechanism, a contact system, a housing, and several protective pole units disposed within the housing. The contact system includes a moving contact 2 and a stationary contact. The protective pole units are either phase pole units or neutral pole units. Each phase pole unit includes a moving contact 2, a stationary contact, an arc-extinguishing mechanism, and a protection mechanism. The neutral pole unit typically includes a moving contact 2 and a stationary contact, but does not have an arc-extinguishing mechanism or a protection mechanism. The moving contact 2 is mounted on a rotating shaft 1 via a contact spring. The rotating shaft 1 of each protective pole unit is integral or fixedly connected. The operating mechanism is connected to the rotating shaft 1. The handle mechanism is located on the operating surface of the circuit breaker and is used for manually operating the circuit breaker to open and close. The handle mechanism is connected to the operating mechanism, and the operating mechanism drives the rotating shaft 1 to rotate, thereby causing the moving contact 2 to rotate and close or open with the stationary contact. The arc-extinguishing mechanism is used to extinguish the arc between the moving contact 2 and the stationary contact. When a fault exists in the circuit of the corresponding phase unit, the protection mechanism triggers the operating mechanism to trip, causing the operating mechanism to disconnect the moving contact 2 from the stationary contact. The protection mechanism includes an overload protection mechanism and / or a short-circuit protection mechanism. The overload protection mechanism is typically a bimetallic strip for overload protection, and the short-circuit protection mechanism is an electromagnetic trip unit for short-circuit protection. The protection mechanism can also be a thermomagnetic trip unit integrating overload and short-circuit protection, etc. The circuit breaker typically includes at least one phase unit, with a neutral unit provided as needed. It should be noted that the neutral unit can also be equipped with the same arc-extinguishing and protection mechanisms as the phase units. Furthermore, the neutral unit can also omit the moving contact 2 and stationary contact, instead using a direct-connection terminal block to connect the incoming and outgoing terminals; this is existing technology in this field. The improvement of this application lies in the contact system of the circuit breaker.

[0030] like Figure 1 , Figure 2 and Figure 3As shown, this application provides a contact system including a rotating shaft 1, at least one moving contact 2, and at least one stationary contact. The rotating shaft 1 includes at least one driving member 11, and a pivot 12 is disposed within the driving member 11. The pivot 12 is disposed along the axial direction of the rotating shaft 1. The moving contact 2 is rotatably mounted on the pivot 12, and a moving contact point 21 is disposed at one end. The stationary contact is disposed opposite to the moving contact 2, and a stationary contact point corresponding to the moving contact point 21 is disposed on the stationary contact. At least one elastic member 3 is installed between the moving contact 2 and the driving member 11. Two sliding grooves 13 are disposed at intervals within the driving member 11, and the length direction of the two sliding grooves 13 is perpendicular to the axial direction of the rotating shaft 1. The pivot 1... The two ends of 2 are respectively set in the two sliding grooves 13. The moving contact 2 is provided with a first locking part 22, and the driving member 11 is provided with a second locking part 14. The electric repulsive force drives the moving contact 2 to disconnect from the stationary contact, so that the moving contact 2 rotates away from the stationary contact with the pivot 12 as the rotation center. The electric repulsive force drives the moving contact 2 to rotate relative to the driving member 11 to the position corresponding to the first locking part 22 and the second locking part 14. The elastic member 3 and / or the electric repulsive force drive the moving contact 2 to drive the pivot 12, so that the pivot 12 slides in the sliding groove 13 until the first locking part 22 and the second locking part 14 come into contact and abut each other and complete the locking, forming a self-locking structure.

[0031] In this invention's contact system, the moving contact 2 is installed inside a driving member 11. Two parallel sliding grooves 13 are provided inside the driving member 11. A pivot 12 is arranged along the axial direction of a rotating shaft 1 within each sliding groove 13, with both ends of the pivot 12 respectively positioned within the two sliding grooves 13. The pivot 12 can slide within the sliding grooves 13. The moving contact 2 is mounted on the pivot 12 and is installed inside the driving member 11 via the pivot 12. The moving contact 2 is provided with a first locking part 22. The sliding grooves 13 are provided with... A second locking part 14 is provided. An electric repulsive force is applied between the moving contact 2 and the stationary contact, pushing the moving contact 2 to rotate away from the stationary contact around the pivot 12. When the moving contact 2 rotates to a position corresponding to the first locking part 22 and the second locking part 14, the elastic element 3 and / or the electric repulsive force drive the moving contact 2 to move, allowing the pivot 12 to slide within the sliding groove 13. The first locking part 22 and the second locking part 14 then abut against each other and lock, forming a self-locking structure, simultaneously achieving an anti-drop effect for the moving contact 2. This utility model has a simple structure and ingenious design, effectively preventing secondary contact between the moving contact 2 and the stationary contact, achieving an anti-drop effect, and improving the breaking capacity of the circuit breaker.

[0032] During normal opening and closing operations of the circuit breaker, the operating mechanism drives the rotating shaft 1 to rotate. The rotating shaft 1 causes the moving contact 2 to swing and contact and separate from the stationary contact 2. The moving contact 2 and the rotating shaft 1 do not rotate relative to each other. When a short-circuit fault occurs in the circuit breaker, the huge short-circuit current causes a huge electric repulsion force between the moving contact 2 and the stationary contact. The electric repulsion force drives the moving contact 1 to separate from the stationary contact at a faster speed, causing the moving contact 2 to rotate relative to the rotating shaft 1 with the pivot 12 as the rotation center. This compresses the elastic element 3. Under the action of the elastic element 3 and / or the electric repulsion force, the pivot 12 moves along the sliding groove 13, and the moving contact 2 moves relative to the rotating shaft 1, so that the first locking part 22 and the second locking part 14 cooperate to complete the locking.

[0033] In one feasible manner, pressing the movable contact 2 causes it to rotate towards the stationary contact, thereby releasing the first locking part 22 and the second locking part 14. The pivot 12 then slides along the sliding groove 13 to its initial position under the action of the elastic element 3. For example, the movable contact 2 is pressed during a re-locking operation via a handle mechanism. The elastic element 3 can be, but is not limited to, a compression spring, a spring, a tension spring, or a torsion spring.

[0034] Preferred, such as Figure 2 and Figure 4 As shown, the moving contact is provided with a rotating part 25, which includes an upwardly protruding first arc-shaped sliding part 251 and two downwardly protruding second arc-shaped sliding parts 252. The first arc-shaped sliding part 251 is disposed between the two second arc-shaped sliding parts 252. The first arc-shaped sliding part 251 and the second arc-shaped sliding part 252 are arranged opposite to each other and form a second through hole 26 in the middle. The front view of the first arc-shaped sliding part 251 and the second arc-shaped sliding part 252 is disc-shaped. The second through hole 26 is located at the center of the disc. The axial direction of the disc is the same as the axial direction of the rotating shaft 1. The first arc-shaped sliding part 251 and the second arc-shaped sliding part 252 are provided. The inner side of the second arc-shaped sliding part 252 has a wide contact area with the pivot 12, which can make the straightness of the rotating part 25 of the moving contact 2 good and not easy to tilt or jam. At the same time, the contact area between the first arc-shaped sliding part 251 and the second locking part 14 is small. Of course, in other embodiments, the rotating part 25 can also be a ring-shaped structure with a uniform thickness at both the top and bottom, that is, it only includes a first arc-shaped sliding part 251 and a second arc-shaped sliding part 252, which are arranged opposite to each other. In addition, the outer side wall of the rotating part 25 below the second locking part 14 may not be arc-shaped, but may be polygonal or the like.

[0035] The first locking part 22 is an arc-shaped groove opened on the upper surface of the first arc-shaped sliding part 251. The second locking part 14 is a limiting shaft arranged in the sliding groove 13 along the axis of the rotating shaft 1. The limiting shaft is located above the moving contact 2. The limiting shaft can be partially placed in the arc-shaped groove to cooperate in limiting the movement. The limiting shaft abuts against the first arc-shaped sliding part 251 to limit the moving contact 2. The moving contact 2 is disengaged from the stationary contact by an electric repulsive force, causing the moving contact 2 to rotate away from the stationary contact around the pivot 12. As the moving contact 2 rotates, the first arc-shaped sliding part 251 protruding on the rotating part 25 of the moving contact 2 rotates around the limiting shaft until the arc-shaped groove approaches the limiting shaft. The moving contact 2 continues to rotate, and a relative gap is generated between the arc-shaped groove and the limiting shaft. Under the action of the elastic element 3, the pivot 12 is displaced relative to the sliding groove 13, and the limiting shaft is partially placed in the arc-shaped groove. The arc-shaped groove abuts against the limiting shaft. Under the action of the elastic element 3, the moving contact 2 cannot be reset, thus preventing the moving contact 2 from falling and causing the electric arc to continue burning or reignite.

[0036] Furthermore, such as Figure 3 As shown, the upper edges of the two sliding grooves 13 of the driving member 11 are provided with arc-shaped grooves 16 facing each other. The two ends of the limiting shaft, which serves as the second locking part 14, are mounted on the arc-shaped grooves 16. The first arc-shaped sliding part 251 abuts against the limiting shaft, so that the two ends of the limiting shaft are respectively fixed in the two arc-shaped grooves 16. Furthermore, the arc-shaped grooves 16 can also be arranged to extend through the limiting shaft axially, forming a through hole, which can also achieve the same technical effect.

[0037] Preferred, such as Figure 3 As shown, the moving contact 2 includes a contact plate 23 and a force-receiving plate 24. The driving member 11 includes a first through hole 15. The force-receiving plate 24 of the moving contact 2 passes through the first through hole 15 and is connected to the elastic member 3. The moving contact 21 is disposed on the contact plate 22. The moving contact 2 rotates about the pivot 12 as the rotation center, and the contact plate 23 and the force-receiving plate 24 of the moving contact 2 move relative to the driving member 11 in a manner similar to a rocker arm.

[0038] Preferred, such as Figure 1 and Figure 4As shown, the moving contact 2 has a flat plate structure. The contact plate 23 and the force-bearing plate 24 are integrally formed and bent together. The moving contact 21 is provided at one end of the contact plate 23, and the rotating part 25 is provided at the connection between the other end and the force-bearing plate 24. The second through hole 26 is provided in the middle of the rotating part 25 along the axial direction of the rotating shaft 1. The pivot 12 passes through the second through hole 26 and is installed in two sliding grooves 13 at both ends. The second through hole 26 can be formed by staggered stamping, which can reduce the cost of raw materials. High-ampere molded case circuit breaker products require a large current-carrying area of ​​the contact blade. The processing of copper material with a large current-carrying area has very high equipment requirements. Generally, a moving contact 2 with a multi-moving contact blade structure is used for manufacturing. However, the contact consistency between the moving contact 2 with the stationary contact is poor, which results in excessive contact resistance and excessive temperature rise. Therefore, the flat plate structure of the moving contact 2 in this application can provide a larger current-carrying area to meet the needs of high-ampere molded case circuit breaker products.

[0039] Furthermore, such as Figure 3 and Figure 4 As shown, the force-bearing plate 24 is provided with a first fixing part 241, and the driving member 11 is provided with a second fixing part 111 corresponding to the first fixing part 241. The two ends of the elastic member 3 are respectively connected to the first fixing part 241 and the second fixing part 111, which are used to fix the elastic member 3 between the force-bearing plate 24 and the driving member 11 to prevent the elastic member 3 from falling off the force-bearing plate 24 during use. The first fixing part 241 is a boss protruding from the side of the force-bearing plate 24 opposite to the elastic member 3 or a groove recessed inward. The second fixing part 111 is a groove recessed inward or a boss protruding outward from the side of the rotating shaft 1 opposite to the elastic member 3. In this embodiment, the second fixing part 111 is a circular groove.

[0040] For example, such as Figure 3 and Figure 4 As shown in the embodiment of this application, two elastic members 3 are provided between the driving member 11 and the force-receiving plate 24 of the moving contact 2. The first fixing part 241 is a boss protruding from the force-receiving plate 24 towards the driving member 11, and the second fixing part 111 is a groove recessed from the driving member 11 towards the force-receiving plate 24. One end of the elastic member 3 is connected to the boss, and the other end is embedded in the groove. Providing two elastic members between the force-receiving plate 24 and the driving member 11 can provide stable elasticity, making the rotation of the moving contact 2 smoother.

[0041] Preferred, such as Figure 3As shown, the driving component 11 includes two opposing side plates 112, a top plate 113, and a front plate 114. The two side plates 112, the top plate 113, and the front plate 114 are bent and connected, forming a first through hole 15 between the two side plates 112. Each of the two side plates 112 has a support platform 115 at its front, and the two support platforms 115 are arranged at intervals. The two sides of the middle of the moving contact protrude to form support plates, and the support plates on both sides of the moving contact are mounted on the support platforms 115. The rear of the two side plates 112 are provided with sliding grooves 13 at intervals. The upper edge of the middle of the sliding groove 13 is provided with an arc-shaped groove 16. The front plate 114 is provided with two second fixing parts 111. The first through hole 15 has a movable gap, and the moving contact can move up and down within the movable gap.

[0042] Furthermore, the arc-shaped groove 16 is disposed in the middle of the sliding groove 13, that is, the limiting shaft, which serves as the second locking part 14, is disposed in the middle of the sliding groove 13. The elastic element 3 can be a compression spring. In the initial state (i.e., the closed state), the elastic element 3 generates a thrust between the driving member 11 and the force plate 24 of the moving contact 2. The pivot 12 is located at the end of the sliding groove 13 away from the force plate 24. Under the push of the electric repulsive force, the moving contact 2 rotates relative to the stationary contact to the position corresponding to the first locking part 22 and the second locking part 14. The pivot 12 moves towards the middle of the sliding groove 13 under the push of the elastic element 3, so that the moving contact 2 completes self-locking relative to the rotating shaft 1.

[0043] Preferred, such as Figure 3 As shown, the rotating shaft 1 of the contact system includes multiple drive components 11 spaced apart. Each drive component 11 contains one moving contact 2. The multiple moving contacts 2 are arranged side by side for use in circuit breakers with multiple protection pole units. The multiple drive components 11 are integrally formed, and a connecting portion 17 is provided between the drive components 11. Of course, the multiple drive components 11 can also be installed later. In this embodiment, the connecting portion 17 is a columnar structure, which is aesthetically pleasing and occupies little space within the circuit breaker.

[0044] Furthermore, the second locking part 14, the pivot 12, and the rotating shaft 1 are arranged in parallel relative to each other, and the length direction of the moving contact 2 is perpendicular to the second locking part 14, the pivot 12, and the rotating shaft 1.

[0045] Preferably, the moving contact 21 and the stationary contact are flat plate structures. After the moving contact 21 and the stationary contact come into contact, they can provide a larger current-carrying area and reduce the resistance between the moving contact 21 and the stationary contact.

[0046] For example, such as Figures 1-4As shown, this application provides a circuit breaker including the above contact system. The circuit breaker includes at least three protection pole units. The rotating shaft 1 of the contact system includes three integrally formed and spaced-apart driving members 11. A cylindrical connecting part 17 is provided between the driving members 11. Each driving member 11 is provided with one moving contact 2. The three moving contacts 2 are arranged side by side and correspond one-to-one with the three stationary contacts arranged side by side.

[0047] For example, to facilitate understanding, Figure 5 This diagram shows the contact system of this application in the closed state. Figure 6 This diagram illustrates the structure of the contact system of this application during the repulsion process. Figure 7 A schematic diagram of the contact system of this application is shown, in which the moving contact 2 is locked by the rotating shaft 1 after being pushed open. The stationary contact in the contact system is not shown.

[0048] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0049] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A contact system comprising a rotating shaft (1) and at least one movable contact (2), the rotating shaft (1) comprising at least one driving member (11) provided with a pivot (12) arranged along the axial direction of the rotating shaft (1), the movable contact (2) being rotatably mounted on the pivot (12), at least one elastic member (3) being mounted between the movable contact (2) and the driving member (11), characterized in that, The driving member (11) is provided with two sliding grooves (13) whose length direction is perpendicular to the axial direction of the rotating shaft (1), and the two ends of the pivot (12) are respectively arranged in the two sliding grooves (13), the movable contact (2) is provided with a first locking portion (22), the driving member (11) is provided with a second locking portion (14), and the movable contact (2) is driven to rotate relative to the driving member (11) to the position corresponding to the first locking portion (22) and the second locking portion (14) by the electric repulsive force, and the elastic member (3) and / or the electric repulsive force drives the pivot (12) to slide in the sliding groove (13) so that the first locking portion (22) and the second locking portion (14) abut and are locked.

2. The contact system of claim 1, wherein, The movable contact (2) is provided with a rotating portion (25), the rotating portion (25) includes a first arc-shaped sliding portion (251) protruding upward and a second arc-shaped sliding portion (252) protruding downward, and the first arc-shaped sliding portion (251) and the second arc-shaped sliding portion (252) are oppositely arranged and form a second through hole (26) in the middle portion. The first locking portion (22) is an arc-shaped groove opened on the upper surface of the first arc-shaped sliding portion (251), the second locking portion (14) is a limiting shaft arranged in the sliding groove (13) along the axial direction of the rotating shaft (1), the limiting shaft is located above the movable contact (2) and abuts against the first arc-shaped sliding portion (251), and the limiting shaft can be partially arranged in the arc-shaped groove to realize cooperation limiting.

3. The contact system of claim 2, wherein, The upper edges of the two sliding grooves (13) of the driving member (11) are oppositely provided with two arc-shaped grooves (16), the first arc-shaped sliding portion (251) abuts against the limiting shaft, and the two ends of the limiting shaft are respectively fixed in the two arc-shaped grooves (16).

4. The contact system of claim 2, wherein, The rotating portion (25) includes a first arc-shaped sliding portion (251) protruding upward and two second arc-shaped sliding portions (252) protruding downward, and the first arc-shaped sliding portion (251) is arranged between the two second arc-shaped sliding portions (252).

5. The contact system of claim 1, wherein, The movable contact (2) includes a contact plate (23) and a stress plate (24), the driving member (11) includes a first through hole (15), the movable contact (2) passes through the first through hole (15), the stress plate (24) is connected with the elastic member (3), and the contact plate (23) is provided with a movable contact point (21).

6. The contact system of claim 5, wherein, The movable contact (2) is in a flat plate structure, the contact plate (23) and the stress plate (24) are integrally formed and are connected by bending, one end of the contact plate (23) is provided with the movable contact point (21), the other end is provided with the rotating portion (25) at the connection position of the contact plate (23) and the stress plate (24), the middle portion of the rotating portion (25) is provided with the second through hole (26) along the axial direction of the rotating shaft (1), and the two ends of the pivot (12) pass through the second through hole (26) and are respectively arranged in the two sliding grooves (13).

7. The contact system of claim 5, wherein, The force-receiving plate (24) is provided with a first fixing portion (241), the driving member (11) is provided with a second fixing portion (111), and at least one elastic member (3) is arranged between the first fixing portion (241) and the second fixing portion (111).

8. The contact system according to claim 7, wherein the first fixing portion (241) is a boss protruding from one side of the force-receiving plate (24) towards the driving member (11), the second fixing portion (111) is a groove recessed from the driving member (11) towards the force-receiving plate (24), and one end of the elastic member (3) is connected to the boss and the other end is embedded in the groove.

9. The contact system of claim 1, wherein, The driving member (11) comprises two opposite side plates (112), a top plate (113) and a front plate (114), the two side plates (112), the top plate (113) and the front plate (114) are connected by bending, a first through hole (15) is formed between the two side plates (112), the front part of each of the two side plates (112) is provided with a support platform (115), the support platforms (115) of the two side plates (112) are oppositely and spacedly arranged, the two sides of the middle part of the movable contact (2) protrude to form support plates, the support plates of the movable contact (2) are installed on the support platforms (115), the rear parts of the two side plates (112) are spacedly provided with the sliding grooves (13), the upper edge of the middle part of the sliding groove (13) is provided with an arc-shaped groove (16), the front plate (114) is provided with two second fixing portions (111), the first through hole (15) has an active gap, and the movable contact (2) can move up and down in the active gap.

10. The contact system of claim 1, wherein, The rotating shaft (1) of the contact system comprises a plurality of driving members (11) which are integrally formed and spacedly arranged, a connecting portion (17) is arranged between the driving members (11), one movable contact (2) is arranged in each driving member (11), and a plurality of movable contacts (2) are arranged side by side.

11. A circuit breaker characterized by, The contact system according to any one of claims 1-9.

12. The circuit breaker according to claim 11, wherein the circuit breaker comprises at least three protection pole units, the rotating shaft (1) of the contact system comprises three driving members (11) which are integrally formed and spacedly arranged, a cylindrical connecting portion (17) is arranged between the driving members (11), one movable contact (2) is arranged in each driving member (11), three movable contacts (2) are arranged side by side, and the three movable contacts (2) correspond to three static contacts arranged side by side respectively, the movable contact (2) is driven by an electric repulsive force and / or an elastic member (3), after rotation relative to the rotating shaft (1) is completed and locking is achieved, an external force is applied to the movable contact (2) to make the movable contact (2) rotate towards the static contact, the first locking portion (22) and the second locking portion (14) are unlocked, and the pivot (12) slides along the sliding groove (13) to the initial position under the action of the elastic member (3).

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