Contact system and circuit breaker

Abstract

The circuit breaker comprises the contact system, the contact system comprises a moving contact, a static contact and a rotating shaft, the moving contact is rotatably arranged on the rotating shaft, a contact spring is arranged between the rotating shaft and the moving contact, the rotating shaft is used for driving the moving contact to be in contact with or separated from the static contact, the moving contact is provided with a driving boss, and the driving boss is provided with a driving motor. A first driving surface and a second driving surface are respectively arranged on two opposite sides of the driving boss, the contact spring is provided with a driving part for pushing the moving contact, and when the driving part pushes the first driving surface, the contact spring applies an acting force for rotating towards the direction close to the static contact to the moving contact. When the electric repulsive force enables the moving contact to rotate in the direction away from the static contact and drives the driving part to slide to the second driving surface, the driving part pushes the second driving surface and the contact spring to apply acting force rotating in the direction away from the static contact to the moving contact, the moving contact is driven to be separated from the static contact, and the moving contact is kept repulsive and prevented from falling back.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and particularly to a contact system and a circuit breaker. Background Art

[0002] The contact system is an important component unit of a low-voltage circuit breaker, mainly composed of moving and static contacts, moving contact blades, static contact blades, contact springs, rotating shafts, etc. When the circuit breaker is closed, the contact spring provides an appropriate contact pressure to ensure reliable contact between the moving and static contacts. In the prior art, under the influence of the electro-dynamic repulsive force generated by the fault current, the moving and static contacts quickly open. When the moving contact opens to a certain position, due to the decrease of the electro-dynamic repulsive force and the reaction force of the contact spring, the moving contact is prone to fall back towards the static contact, resulting in the acceleration of the combustion of the fault arc and even the re-ignition of the circuit breaker, which is not conducive to the extinguishment of the circuit breaker arc. Summary of the Invention

[0003] The purpose of the present invention is to overcome at least one defect of the prior art and provide a contact system.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A contact system includes a moving contact, a static contact, and a rotating shaft. The moving contact is rotatably arranged on the rotating shaft. A contact spring is provided between the rotating shaft and the moving contact. The rotating shaft is used to drive the moving contact to contact and separate from the static contact.

[0006] The moving contact is provided with a driving boss. A first driving surface and a second driving surface are respectively provided on two opposite sides of the driving boss. The contact spring is provided with a driving part for pushing the moving contact. When the driving part pushes the first driving surface, the contact spring applies a rotational force to the moving contact in the direction of approaching the static contact. The electro-dynamic repulsive force generated by the fault current causes the moving contact to rotate away from the static contact. When the driving part slides to the second driving surface, the driving part pushes the second driving surface, and the contact spring applies a rotational force to the moving contact in the direction of moving away from the static contact, driving the moving contact to separate from the static contact.

[0007] Preferably, the perpendicular lines of the contact positions between the first driving surface and the driving part, and between the second driving surface and the driving part are relatively arranged on both sides of the radial direction of the rotation center of the moving contact.

[0008] Preferably, the moving contact includes a pivoting part and a conductive part. The pivoting part is rotatably arranged on the rotating shaft. A groove structure is provided on the side of the pivoting part. The driving boss is arranged in the middle of the groove, and a first driving groove and a second driving groove are respectively formed on two opposite sides of the driving boss. The first driving surface and the second driving surface on both sides of the driving boss respectively constitute one side wall of the first driving groove and the second driving groove.

[0009] Preferably, both the first driving surface and the second driving surface are flat surfaces, and the length of the first driving surface is greater than that of the second driving surface. When the moving contact touches the static contact, if the rotating shaft continues to rotate, it will rotate relative to the moving contact and compress the contact spring, and at the same time, the driving part slides along the first driving surface.

[0010] Preferably, the included angle between the first driving surface and the second driving surface is set to be greater than degrees.

[0011] Preferably, the conductive part includes two relatively arranged contact parts and a connecting part connected between the two contact parts. The contact system is provided with two static contacts, and the pivoting part is connected to the connecting part to drive the conductive part to swing, and make the two contact parts contact and separate from the two static contacts respectively.

[0012] Preferably, a contact groove is provided inside the rotating shaft. A driving shaft and a first support column are provided in the contact groove. The pivoting part of the moving contact is inserted into the contact groove and rotatably connected to the driving shaft. The contact spring is arranged in the contact groove and acts between the rotating shaft and the moving contact. The contact spring pushes the moving contact to be limited by the first support column and presses the moving contact onto the rotating shaft.

[0013] Preferably, the contact spring is a torsion spring, which includes a cylindrical spiral part, and a support part and a driving part respectively connected to the spiral part. The contact spring includes two spiral parts. The support parts on the two spiral parts are respectively limited by the second support column in the contact groove. The rod-shaped driving arms protruding from the two spiral parts are connected by a sliding part to form a U-shaped driving part.

[0014] Preferably, when the driving part of the contact spring is located in the second driving groove, the rotating shaft drives the moving contact to move towards the static contact. After the moving contact touches the static contact, the moving contact is blocked by the static contact and stops rotating with the rotating shaft. The rotating shaft continues to rotate and rotates relative to the moving contact. The rotating shaft drives the driving shaft to contact the first blocking surface along the pivoting hole, and then the rotating shaft drives the driving part of the contact spring to slide from the second driving groove into the first driving groove.

[0015] Preferably, the operating mechanism includes a bracket, a rocker arm assembly and a link mechanism. The rocker arm assembly is rotatably arranged on the bracket. The link mechanism includes a re-latch, a transmission part, a trip latch and a lock latch respectively rotatably arranged on the bracket. The re-latch is in limit cooperation with the lock latch. The lock latch is in locking cooperation with the trip latch. The transmission part is rotatably connected to the trip latch. A transmission shaft is provided on the transmission part. The transmission shaft is connected to the rocker arm assembly through an energy storage spring. The rocker arm assembly drives the rotating shaft to rotate through the transmission shaft. When the lock latch locks the trip latch, the energy storage spring is locked in the energy storage state.

[0016] Preferably, the rotating shaft is provided with a trigger member. When the electric repulsive force generated by the fault current drives the moving contact away from the static contact and rotates relative to the rotating shaft, the moving contact drives the trigger member when it moves away from the static contact. The trigger member drives the lock to release the limit cooperation, drives the lock to unlock and release the energy storage spring.

[0017] Preferably, the trigger member is rotatably arranged in the contact slot of the rotating shaft, and a support portion is provided on one end of the trigger member located in the contact slot, and the other end of the trigger member is provided with a trigger portion extending out of the contact slot for pushing and re-fastening, and a pushing portion is provided on the pivot portion of the moving contact, and the moving contact drives the trigger member by driving the supporting portion of the trigger member through the pushing portion.

[0018] Preferably, the stationary contact and the trigger member are coaxially arranged on the drive shaft.

[0019] Preferably, the trigger member includes a trigger part and two relatively arranged rotating parts, and a supporting part respectively connected between the two rotating parts. The two rotating parts are relatively spaced and rotatably arranged on the driving shaft. The pivot part of the moving contact is arranged between the two rotating parts. A pushing part protruding radially is provided on the moving contact. The trigger part is connected to the two rotating parts, and the rotating part drives the trigger part to push and rotate.

[0020] The contact system created by the present invention, the contact spring can not only drive the moving contact and the static contact to be pressed together, but also the contact spring can use the electric repulsion force to change the direction of the force applied to the moving contact, so that the moving contact is kept in a repelled state, avoiding the falling back of the moving contact and causing the fault arc to accelerate the burning and damage the moving contact and the static contact, thereby protecting the contact system.

[0021] In addition, the contact spring is a torsion spring, including two spiral parts. The driving arms extending from the two spiral parts are connected by a sliding part to form a U-shaped driving part. The sliding part is used to slide between the first driving groove and the second driving groove and push the moving contact. It is not only easy to install but also has reliable sliding fit.

[0022] In addition, the length of the first driving surface is greater than that of the second driving surface. When the moving contact contacts the stationary contact, the rotating shaft continues to rotate relative to the moving contact and compresses the contact spring. At the same time, the driving part slides along the first driving surface. The longer first driving surface can prevent the driving part from exceeding the highest position of the driving boss, that is, it will not slide to the second driving surface, so that the contact spring maintains the function of driving the moving contact and the stationary contact to be pressed tightly.

[0023] A circuit breaker is also provided, which comprises an operating mechanism and the contact system.

[0024] The circuit breaker of the present invention can avoid the accelerated combustion of the fault arc caused by the falling back of the moving contact when interrupting a large current by setting the contact system, and has the characteristics of high reliability and long service life. Brief Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the contact system of the present invention;

[0026] Figure 2 is a schematic structural diagram when the moving contact and the static contact of the present invention are in contact;

[0027] Figure 3 is a schematic structural diagram when the moving contact is separated from the static contact under the drive of the electric repulsive force of the present invention;

[0028] Figure 4 is a schematic structural diagram when the moving contact is separated from the static contact driven by the rotating shaft of the present invention;

[0029] Figure 5 is a schematic structural diagram of the moving contact of the present invention;

[0030] Figure 6 is a schematic diagram of the cooperation of the moving contact, the trigger and the re-latch of the present invention;

[0031] Figure 7 is a schematic structural diagram of the trigger of the present invention;

[0032] In the figure, moving contact 1; static contact 2; rotating shaft 3; contact spring 4; driving part 41; first driving groove 11; second driving groove 12; first driving surface 111; second driving surface 121; pivoting part 13; contacting part 14; connecting part 15; driving boss 16; riveting part 18; driving shaft 31; pivoting hole 130; first support column 32; spiral part 42; supporting part 43; second support column 33; third support column 34; limiting groove 35; sliding part 44; bracket 5; transmission part 51; jumping latch 52; transmission shaft 53; first connecting rod 54; second connecting rod 55; re-latch 6; locking latch 7; trigger 8; triggering part 81; rotating part 82; supporting part 83; pushing part 84. Detailed Description of the Invention

[0033] The following embodiments given in conjunction with the drawings further illustrate the specific implementation manners of the contact system of the present invention. The contact system of the present invention is not limited to the description of the following embodiments.

[0034] As Figure 1 , 4As shown in the figure, the circuit breaker includes an operating mechanism and a contact system. The contact system includes a moving contact 1, a static contact 2, and a rotating shaft 3. The operating mechanism is connected to the rotating shaft 3 to drive the rotation of the rotating shaft 3. The moving contact 1 is arranged on the rotating shaft 3. A contact spring 4 is provided between the rotating shaft 3 and the moving contact 1. The contact spring 4 presses the moving contact 1 onto the rotating shaft 3. The rotation of the rotating shaft 3 can drive the moving contact 1 to contact and separate from the static contact 2. When the moving contact 1 contacts the static contact 2, the contact spring 4 pushes the moving contact 1 to press tightly against the static contact 2. This is the prior art in this field.

[0035] As Figure 1-4 shown, an improvement in this embodiment is that the contact spring 4 can not only play a role in driving the moving contact 1 to press tightly against the static contact 2, but also the contact spring 4 can use the electro - dynamic repulsive force of the fault current to change the direction of the force applied to the moving contact 1, so that the moving contact 1 separates from the static contact 2 before the operating mechanism trips and will not rebound.

[0036] The moving contact 1 is provided with a driving boss 16. A first driving surface 111 and a second driving surface 121 are respectively provided on two opposite sides of the driving boss 16. The contact spring 4 is provided with a driving portion 41 for pushing the moving contact 1. When the driving portion 41 pushes the first driving surface 111, the contact spring 4 applies a force to the moving contact 1 to rotate in the direction close to the static contact 2. The driving portion 41 is used to drive the moving contact 1 to rotate close to the static contact 2. The electro - dynamic repulsive force generated by the fault current causes the moving contact 1 to rotate in the direction away from the static contact 2. When driving the driving portion 41 to slide to the second driving surface 121, the driving portion 41 pushes the second driving surface 121, and the contact spring 4 applies a force to the moving contact 1 to rotate in the direction away from the static contact 2, driving the moving contact 1 to separate from the static contact 2.

[0037] Specifically, the moving contact 1 is provided with a driving boss 16. On two opposite sides of the driving boss 16, there are respectively a first driving surface 111 and a second driving surface 121. The connection of the first driving surface 111 and the second driving surface 121 is the highest position of the driving boss 16. The contact spring 4 is provided with a driving part 41 for pushing the moving contact 1. When the driving part 41 pushes the first driving surface 111 and the second driving surface 121, thrusts F1 and F2 are respectively applied to the driving boss 16. The thrusts F1 and F2 respectively correspond to the perpendicular lines of the contact positions of the first driving surface 111 and the driving part 41, and the second driving surface 121 and the driving part 41. The directions of the thrusts F1 and F2 are relatively arranged on both sides of the rotation center of the moving contact 1, that is, the thrusts F1 and F2 respectively correspond to the perpendicular lines of the contact positions of the first driving surface 111 and the driving part 41, and the second driving surface 121 and the driving part 41, and are relatively arranged on both sides of the radial direction of the rotation center of the moving contact 1. The thrusts F1 and F2 are respectively used to drive the moving contact 1 to rotate in two opposite directions. Thrust F1 is used to drive the moving contact 1 to rotate in the clockwise direction in Figure 2 and thrust F2 is used to drive the moving contact 1 to rotate counterclockwise in Figure 3 .

[0038] As Figure 2 shown, during normal closing and opening, before the moving contact 1 contacts the static contact 2, the driving part 41 is used to push the first driving surface 111 to limit the moving contact 1 to the rotating shaft 3. After the moving contact 1 contacts, the driving part 41 is used to push the first driving surface 111 to press the moving contact 1 against the static contact 2;

[0039] As Figure 3 shown, when a fault current occurs, before the operating mechanism trips, the moving contact 1 rotates first under the drive of the electric repulsive force, causing the moving contact 1 to rotate relative to the rotating shaft 3. The driving part 41 of the contact spring 4 passes over the highest position of the driving boss 16 and slides from the first driving surface 111 to the second driving surface 121, causing the moving contact 1 to move away from the static contact 2 under the drive of the contact spring 4. Even when the electric repulsive force weakens, the moving contact 1 can be reliably separated from the static contact 2. Then, the short-circuit electromagnetic release or other protection mechanisms in the circuit breaker trigger the operating mechanism to complete the tripping, driving the rotating shaft 3 to trip and open. Refer to Figure 4 . Through the rotating shaft 3, the moving contact 1 is driven to rotate to a position farther from the static contact 2. During the rotation of the rotating shaft 3, the moving contact 1 is limited by a limiting part (not shown in the figure), causing the rotating shaft 3 to rotate relative to the moving contact 1 and driving the contact spring 4 to rotate, so that the driving part 41 of the contact spring 4 is reset from the second driving surface 121 to the first driving surface 111. The limiting part can be an integral structure on the outer shell or a structure separately arranged in the shell, which is not specifically limited here.

[0040] The contact system of the present invention. The contact spring can not only drive the moving contact to press against the static contact, but also utilize the electro-dynamic repulsion force to change the direction of the force applied to the moving contact, keeping the moving contact in a repelled state, avoiding the failure arc from accelerating combustion and damaging the moving contact and the static contact due to the falling back of the moving contact, and playing a role in protecting the contact system.

[0041] Therefore, for the circuit breaker of the present invention, by providing the above-mentioned contact system, when breaking a large current, it can avoid the failure arc from accelerating combustion and damaging the moving contact and the static contact due to the falling back of the moving contact, and has the characteristics of high reliability and long service life.

[0042] As Figure 5 shown, the moving contact 1 includes a pivoting portion 13 and a conductive portion. The conductive portion is U-shaped, which includes two relatively arranged contact portions 14 and a connecting portion 15 connected between the two contact portions 14. The corresponding contact system is provided with two static contacts 2 and two conductive bars respectively connected to the two static contacts 2. The two conductive bars are relatively arranged on both sides of the moving contact 1, and the two static contacts 2 are arranged on the same side of the moving contact 1. A partition is provided between the two static contacts 2. The two contact portions 14 are respectively inserted into the opposite sides of the partition. The pivoting portion 13 is connected to the connecting portion 15. The pivoting portion 13 is used to drive the conductive portion to swing and make the two contact portions 14 contact and separate from the two static contacts 2 respectively. When the two contact portions 14 contact the two static contacts 2, the two static contacts 2 are electrically connected through the conductive portion. Moving contacts are provided on the two contact portions 14, static contacts are provided on the two static contacts 2, and the moving contacts on the two contact portions 14 cooperate with the static contacts on the two static contacts 2.

[0043] Furthermore, the pivoting portion 13 is in the shape of a flat plate. The pivoting portion 13 is provided with a pivoting hole 130 sleeved on the driving shaft 31. The pivoting portion 13 is rotatably arranged on the driving shaft 31 of the rotating shaft 3 through the pivoting hole 130. An M-shaped groove structure is provided on the side of the pivoting portion 13. The driving boss 16 is arranged in the middle of the groove structure. The first driving groove 11 and the second driving groove 12 are respectively formed on the opposite sides of the driving boss 16. The first driving surfaces 111 and the second driving surfaces 121 on both sides of the driving boss 16 respectively constitute one side wall of the first driving groove 11 and the second driving groove 12. Preferably, the connecting portion 15 is provided with a riveting hole, and the pivoting portion 13 is provided with a riveting portion 18 for inserting into the riveting hole Figure 2 , and the riveting portion 18 is riveted to the connecting portion 15.

[0044] By arranging the driving boss 16 at the center of the M-shaped groove structure, with the first driving groove 11 and the second driving groove 12 formed on both sides, the driving part 41 of the contact spring 4 can be better limited, reducing the assembly difficulty. It can be understood that the driving boss 16 can also adopt other shapes, such as a curved surface shape, and the groove structure can also adopt other shapes, which all fall within the protection scope of the present invention. In addition, the pivoting part 13 and the conductive part can also be integrally formed. In addition, the conductive part of the moving contact 1 in this embodiment is provided with two contact parts 14. Obviously, only one contact part 14 can be provided, and correspondingly, only one static contact 2 is provided.

[0045] Furthermore, both the first driving surface 111 and the second driving surface 121 are flat surfaces, and the length of the first driving surface 111 is greater than that of the second driving surface 121. When the moving contact 1 contacts the static contact 2, when the rotating shaft 3 continues to rotate, it will rotate relative to the moving contact 1 and compress the contact spring 4. At the same time, the driving part 41 slides along the first driving surface 111. The longer first driving surface 111 can prevent the driving part 41 from crossing the highest position of the driving boss 16, that is, it will not slide onto the second driving surface 121, enabling the contact spring 4 to maintain the function of driving the moving contact 1 to be pressed against the static contact 2. Preferably, the included angle between the first driving surface 111 and the second driving surface 121 is set to be greater than 90 degrees, which can improve the effect of the acting force of the contact spring 4.

[0046] As Figure 2 shown, the rotating shaft 3 is in a cylindrical shape, and a contact groove is provided inside the rotating shaft 3. The pivoting part 13 at one end of the moving contact 1 is rotatably installed in the contact groove, and the end with the moving contact extends out of the contact groove. The contact spring 4 is arranged in the contact groove and acts between the rotating shaft 3 and the moving contact 1 to press the moving contact 1 onto the rotating shaft 3, enabling the moving contact 1 to rotate with the rotating shaft 3. Specifically, a driving shaft 31 and a first support column 32 are provided in the contact groove. The pivoting part 13 of the moving contact 1 is inserted into the contact groove and rotatably connected to the driving shaft 31. The first support column 32 is located in the direction of the moving contact 1 close to the static contact 2. The contact spring 4 pushes the moving contact 1 to be limited by the first support column 32, pressing the moving contact 1 onto the rotating shaft 3. When the moving contact 1 contacts the static contact 2, the contact spring 4 pushes the moving contact 1 to be pressed against the static contact 2, and when the moving contact 1 and the static contact 2 are separated, it is used to push the moving contact 1 to be limited by the first support column 32, enabling the moving contact 1 to rotate with the rotating shaft 3.

[0047] Further, the contact spring 4 in this embodiment is a torsion spring, which includes a cylindrical spiral part 42, a support part 43 and a driving part 41 respectively connected to the spiral part 42. A second support column 33 and a third support column 34 are provided in the contact groove. The spiral part 42 of the contact spring 4 is arranged between the third support column 34 and the second support column 33. The support part 43 of the contact spring 4 contacts the second support column 33. The second support column 33 is provided with a limiting groove 35 for limiting the support part 43. The torsion spring may only include one spiral part 42, and the rod-shaped driving arm extending from the spiral part 42 serves as the driving part 41. The rod-shaped driving arm can be bent and extended into the first driving groove 11 and the second driving groove 12. Of course, the contact spring 4 can also be other spring structures such as a spring piece.

[0048] Further, the contact spring 4 in this embodiment includes two spiral parts 42. The support parts 43 on the two spiral parts 42 are respectively limited by the second support column 33. The driving arms extending from the two spiral parts 42 are connected by a sliding part 44 to form a U-shaped driving part 41. The driving arms on the two spiral parts 42 are relatively arranged on both sides of the moving contact 1. The sliding part 44 is used for sliding between the first driving groove 11 and the second driving groove 12 and pushing the moving contact 1.

[0049] As Figure 1 shown, the operating mechanism includes a bracket 5, a rocker arm assembly (not shown in the figure) and a link mechanism respectively arranged on the bracket 5. The rocker arm assembly is rotatably arranged on the bracket 5. An operating handle is provided on the rocker arm assembly. The rocker arm assembly drives the rotating shaft 3 to rotate through the link mechanism, so that the rotating shaft 3 drives the moving contact 1 to contact and separate from the static contact 2;

[0050] The link mechanism includes a re-latch 6, a transmission member 51, a trip latch 52 and a lock latch 7 respectively rotatably arranged on the bracket 5. The re-latch 6 is in limit cooperation with the lock latch 7. The lock latch 7 is in locking cooperation with the trip latch 52. The transmission member 51 is rotatably connected to the trip latch 52. A transmission shaft 53 is provided on the transmission member 51. The transmission shaft 53 is connected to the rocker arm assembly through a energy storage spring (not shown in the figure). The rocker arm assembly drives the rotating shaft 3 to rotate through the transmission shaft 53. When the lock latch 7 locks the trip latch 52, the connection part between the transmission member 51 and the trip latch 52 serves as the rotation center of the transmission shaft 53. The transmission shaft 53 drives the rotating shaft 3 to rotate under the drive of the rocker arm assembly, so that when the rotating shaft 3 rotates, it drives the moving contact 1 to contact and separate from the static contact 2, and stores energy for the energy storage spring when the moving contact 1 contacts the static contact 2, and locks the energy storage spring in the energy storage state;

[0051] When a circuit fails, the short-circuit electromagnetic release or other protective mechanisms, such as the overload protection mechanism and the leakage protection mechanism, trigger the operating mechanism to trip, that is, trigger the re-button 6 and the lock buckle 7 to release the limit cooperation, so that the lock buckle 7 and the jump buckle 52 are unlocked, and the transmission member 51 rotates with the jump buckle 52, unlocking and releasing the energy storage spring, and the energy storage spring drives the rotating shaft 3 to rotate through the transmission shaft 53, so that the rotating shaft 3 drives the moving contact 1 to separate from the static contact 2;

[0052] After the lock catch 7 and the trip catch 52 are unlocked, the handle of the circuit breaker is moved in the opening direction to perform a re-locking operation. The re-lock 6 can push the lock catch 7 and the trip catch 52 to be re-locked under the drive of the rocker arm assembly, and the re-lock 6 and the lock catch 7 are re-limited and matched. This is the prior art in the field.

[0053] The operating mechanism of this embodiment further includes a first connecting rod 54 and a second connecting rod 55 which are rotatably connected. The first connecting rod 54 is connected to the transmission shaft 53, and the second connecting rod 55 is connected to the rotating shaft 3. The transmission shaft 53 drives the rotating shaft 3 to rotate through the first connecting rod 54 and the second connecting rod 55. The operating mechanism is a prior art in the art and will not be described in detail. In addition to the technical solution of this embodiment, the operating mechanism may also adopt other technical solutions.

[0054] like Figure 1 As shown, the rotating shaft 3 is provided with a trigger 8. When the electric repulsive force generated by the fault current drives the moving contact 1 away from the static contact 2 and rotates relative to the rotating shaft 3, the moving contact 1 drives the trigger 8 when it moves away from the static contact 2. The trigger 8 drives the re-buckle 6 to release the limit fit with the lock buckle 7, drives the lock buckle 7 to unlock the trip buckle 52 and release the energy storage spring. The trigger 8 drives the lock buckle 7 to unlock the trip buckle 52 through the re-buckle 8, and the tripping can be completed in advance, accelerating the separation of the moving contact 1 from the static contact 2. When a short circuit fault occurs in the circuit breaker, due to the huge short-circuit current, a huge electric repulsive force is generated between the moving contact 1 and the static contact 2. The electric repulsive force drives the moving contact 1 to separate from the static contact 2 at a faster speed, causing the moving contact 1 to rotate relative to the rotating shaft 3. The moving contact 1 pushes the trigger 8 to trigger the operating mechanism to trip, which can trigger the operating mechanism to trip faster than the short-circuit electromagnetic release or other protection mechanisms, overload protection mechanisms, leakage protection mechanisms, etc., thereby accelerating the tripping action and avoiding damage to the contact system caused by a long tripping time.

[0055] The rotating shaft 3 is cylindrical in shape, and a contact groove is provided inside the rotating shaft 3. A driving shaft 31 is provided in the contact groove. The pivot portion 13 at one end of the moving contact 1 is sleeved on the driving shaft 31 and is rotatably installed in the contact groove. The end with the moving contact extends out of the contact groove. The contact spring 4 is arranged in the contact groove and acts between the rotating shaft 3 and the moving contact 1 to press the moving contact 1 onto the rotating shaft 3 so that the moving contact 1 rotates with the rotating shaft 3.

[0056] like Figure 6-7As shown in the figure, the trigger member 8 is rotatably arranged in the contact head groove of the rotating shaft 3, and a support portion 83 is provided at one end of the trigger member 8 located in the contact head groove. The other end of the trigger member 8 is provided with a trigger portion 81 extending out of the contact head groove for pushing the re-latch 6. A pushing portion 84 is provided on the pivoting portion 13 of the moving contact 1. The moving contact 1 drives the support portion 83 of the trigger member 8 through the pushing portion 84 to drive the trigger member 8.

[0057] Preferably, the static contact 2 and the trigger member 8 are coaxially arranged on the drive shaft 31, which has the characteristics of being compact and convenient for assembly.

[0058] Furthermore, the trigger member 8 includes a trigger portion 81 and two relatively arranged rotating portions 82, and a support portion 83 respectively connected between the two rotating portions 82. The two rotating portions 82 are relatively spaced apart and rotatably arranged on the drive shaft 31. The pivoting portion 13 of the moving contact 1 is arranged between the two rotating portions 82. A radially protruding pushing portion 84 is provided on the moving contact 1. The trigger portion 81 is connected to the two rotating portions 82. The rotating portion 82 drives the trigger portion 81 to push the re-latch 6 to rotate. The structure of the trigger member 8 is simple and has high reliability. The trigger member 8 is integrally formed. The trigger portion 81 is a curved elastic arm in the shape of a curved rod, and the curved elastic arm is inserted into the re-latch 6 to drive the re-latch 6 to rotate.

[0059] The structural design of the trigger member 8 is simple, which not only occupies a small space, but also does not require changing the existing circuit breaker structure.

[0060] When a short-circuit fault occurs in the circuit breaker, due to the huge short-circuit current, a huge electro-dynamic repulsive force is generated between the moving contact 1 and the static contact 2. The electro-dynamic repulsive force drives the moving contact 1 to separate from the static contact 2 at a faster speed, resulting in the rotation of the moving contact 1 relative to the rotating shaft 3. The pushing portion 84 of the moving contact 1 pushes the support portion 83 of the trigger member 8, so that the trigger portion 81 of the trigger member 8 pushes the re-latch 6, triggering the tripping of the operating mechanism.

[0061] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is usually placed during use. It is only for the convenience of description and does not indicate that the indicated device or element must have a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for differential description and cannot be construed as indicating relative importance.

[0062] The above content is a further detailed description of the present invention and creation in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention and creation is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention and creation pertain, without departing from the concept of the present invention and creation, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention and creation.

Claims

1. A contact system, comprising a moving contact (1), a stationary contact (2) and a rotating shaft (3), wherein the moving contact (1) is rotatably arranged on the rotating shaft (3), a contact spring (4) is arranged between the rotating shaft (3) and the moving contact (1), and the rotating shaft (3) is used to drive the moving contact (1) to contact and separate with the stationary contact (2), characterized in that: The movable contact (1) is provided with a driving boss (16), and a first driving surface (111) and a second driving surface (121) are respectively provided on two opposite sides of the driving boss (16). The contact spring (4) is provided with a driving portion (41) for pushing the movable contact (1). When the driving portion (41) pushes the first driving surface (111), the contact spring (4) applies a force to the movable contact (1) to rotate in a direction close to the stationary contact (2). The electromotive repulsive force generated by the fault current causes the movable contact (1) to rotate in a direction away from the stationary contact (2). When the driving portion (41) is driven to slide to the second driving surface (121), the driving portion (41) pushes the second driving surface (121). The contact spring (4) applies a force to the movable contact (1) to rotate in a direction away from the stationary contact (2), and drives the movable contact (1) to separate from the stationary contact (2).

2. The contact system according to claim 1, characterized in that: A perpendicular line of a contact position between the first drive surface (111) and the drive portion (41), and a perpendicular line of a contact position between the second drive surface (121) and the drive portion (41) are relatively arranged on both sides of the radial direction of the rotation center of the moving contact (1).

3. The contact system according to claim 1, characterized in that: The movable contact (1) comprises a pivoting portion (13) and a conductive portion, wherein the pivoting portion (13) is rotatably arranged on a rotating shaft (3), a groove structure is arranged on the side of the pivoting portion (13), the driving boss (16) is arranged in the middle of the groove, and a first driving groove (11) and a second driving groove (12) are formed on opposite sides of the driving boss (16), respectively, and a first driving surface (111) and a second driving surface (121) on both sides of the driving boss (16) respectively constitute a side groove wall of the first driving groove (11) and the second driving groove (12).

4. The contact system according to claim 1, characterized in that: The first drive surface (111) and the second drive surface (121) are both planes, the length of the first drive surface (111) is greater than the length of the second drive surface (121), and when the moving contact (1) contacts the stationary contact (2), the rotating shaft (3) continues to rotate relative to the moving contact (1) and compresses the contact spring (4), while the driving part (41) slides along the first drive surface (111).

5. The contact system according to claim 1, characterized in that: The included angle between the first driving surface (111) and the second driving surface (121) is greater than (90) degrees.

6. The contact system according to claim 3, characterized in that: The conductive part comprises two contact parts (14) arranged opposite to each other, and a connecting part (15) connected between the two contact parts (14); the contact system is provided with two stationary contacts (2); the pivoting part (13) is connected to the connecting part (15) to drive the conductive part to swing, and to make the two contact parts (14) contact and separate from the two stationary contacts (2) respectively.

7. The contact system according to claim 1, characterized in that: A contact slot is provided inside the rotating shaft (3), a driving shaft (31) and a first supporting column (32) are provided in the contact slot, a pivot portion (13) of the moving contact (1) is inserted into the contact slot and is rotationally connected to the driving shaft (31), a contact spring (4) is provided in the contact slot, and acts between the rotating shaft (3) and the moving contact (1), the contact spring (4) pushes the moving contact (1) and the first supporting column (32) to limit the position, and the moving contact (1) is pressed and installed on the rotating shaft (3).

8. The contact system according to claim 1, characterized in that: The contact spring (4) is a torsion spring, comprising a cylindrical spiral portion (42), and a supporting portion (43) and a driving portion (41) respectively connected to the spiral portion (42); the contact spring (4) comprises two spiral portions (42); the supporting portions (43) on the two spiral portions (42) are respectively limited by the second supporting column (33) in the contact slot; and the rod-shaped driving arms extending from the two spiral portions (42) are connected via a sliding portion (44) to form a driving portion (41) with a U-shaped structure.

9. The contact system according to claim 3, characterized in that: When the driving portion (41) of the contact spring (4) is located in the second driving groove (12), the rotating shaft (3) drives the moving contact (1) to move in a direction close to the stationary contact (2). After the moving contact (1) contacts the stationary contact (2), the moving contact (1) is blocked by the stationary contact (2) and stops rotating along with the rotating shaft (3). The rotating shaft (3) continues to rotate and rotates relative to the moving contact (1). The rotating shaft (3) drives the driving shaft (31) to contact the first blocking surface (131) along the pivot hole (130), and then the rotating shaft (3) drives the driving portion (41) of the contact spring (4) to slide from the second driving groove (12) into the first driving groove (11).

10. A circuit breaker, characterized in that: The invention comprises an operating mechanism and a contact system as claimed in any one of claims 1 to 9.

11. The circuit breaker according to claim 10, characterized in that: The operating mechanism comprises a bracket (5), a rocker assembly and a connecting rod mechanism. The rocker assembly is rotatably arranged on the bracket (5). The connecting rod mechanism comprises a re-lock (6), a transmission member (51), a jump lock (52) and a lock lock (7) which are respectively rotatably arranged on the bracket (5). The re-lock (6) and the lock lock (7) are limitedly matched. The lock lock (7) and the jump lock (52) are locked and matched. The transmission member (51) and the jump lock (52) are rotatably connected. A transmission shaft (53) is provided on the transmission member (51). The transmission shaft (53) is connected to the rocker assembly through an energy storage spring. The rocker assembly drives the rotating shaft (3) to rotate through the transmission shaft (53). When the lock lock (7) locks the jump lock (52), the energy storage spring is locked in an energy storage state.

12. The circuit breaker according to claim 11, characterized in that: The rotating shaft (3) is provided with a trigger member (8). When the electric repulsive force generated by the fault current drives the moving contact (1) away from the stationary contact (2) and rotates relative to the rotating shaft (3), the moving contact (1) drives the trigger member (8) when it moves away from the stationary contact (2). The trigger member (8) drives the re-lock (6) to release the limit fit with the lock buckle (7), drives the lock buckle (7) to unlock the trip buckle (52) and release the energy storage spring.

13. The circuit breaker according to claim 12, characterized in that: The trigger member (8) is rotatably arranged in the contact slot of the rotating shaft (3), and a support portion (83) is provided on one end of the trigger member (8) located in the contact slot, and a trigger portion (81) is provided on the other end of the trigger member (8) and extends out of the contact slot for pushing the re-lock (6), and a pushing portion (84) is provided on the pivot portion (13) of the moving contact (1), and the moving contact (1) drives the support portion (83) of the trigger member (8) through the pushing portion (84) to drive the trigger member (8).

14. The circuit breaker according to claim 13, characterized in that: The stationary contact (2) and the trigger member (8) are coaxially arranged on the drive shaft (31).

15. The circuit breaker according to claim 14, characterized in that: The trigger member (8) comprises a trigger portion (81) and two rotating portions (82) arranged opposite to each other, and a supporting portion (83) respectively connected between the two rotating portions (82); the two rotating portions (82) are arranged opposite to each other and are rotatably arranged on the driving shaft (31); the pivot portion (13) of the moving contact (1) is arranged between the two rotating portions (82); a pushing portion (84) protruding in the radial direction is provided on the moving contact (1); the trigger portion (81) is connected to the two rotating portions (82); the rotating portion (82) drives the trigger portion (81) to push the re-lock (6) to rotate.

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