WO2018086539A1 - Disjoncteur - Google Patents

Disjoncteur Download PDF

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Publication number
WO2018086539A1
WO2018086539A1 PCT/CN2017/109955 CN2017109955W WO2018086539A1 WO 2018086539 A1 WO2018086539 A1 WO 2018086539A1 CN 2017109955 W CN2017109955 W CN 2017109955W WO 2018086539 A1 WO2018086539 A1 WO 2018086539A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact
link
circuit breaker
rotating shaft
movable contact
Prior art date
Application number
PCT/CN2017/109955
Other languages
English (en)
Chinese (zh)
Inventor
朱金保
谷春雷
刘阚元
何高升
南添
Original Assignee
北京人民电器厂有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 北京人民电器厂有限公司 filed Critical 北京人民电器厂有限公司
Priority to AU2017332969A priority Critical patent/AU2017332969B2/en
Priority to RU2018115183A priority patent/RU2683244C1/ru
Priority to BR112018006518A priority patent/BR112018006518A2/pt
Priority to SG11201802880XA priority patent/SG11201802880XA/en
Priority to UAA201803893A priority patent/UA122156C2/uk
Priority to ZA2018/02281A priority patent/ZA201802281B/en
Publication of WO2018086539A1 publication Critical patent/WO2018086539A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/46—Driving mechanisms, i.e. for transmitting driving force to the contacts using rod or lever linkage, e.g. toggle

Definitions

  • the invention belongs to the technical field of electrical switches, and in particular to a circuit breaker.
  • the circuit breaker can disconnect the circuit in time when the fault current occurs in the circuit, ensuring the safety of the entire circuit and other electrical loads.
  • Circuit breakers typically have overload, short circuit, and residual current protection, and due to the rapid development of power distribution systems, circuit breakers are increasingly required to have higher breaking reliability and smaller size.
  • a circuit breaker is generally configured to have at least one contact mechanism that can be placed or disconnected, an opening and closing mechanism, a trip unit, an arc extinguishing mechanism, and a combination of the opening and closing mechanism and the trip unit.
  • the main spring wherein the opening and closing mechanism is composed of an operating member and a link mechanism, and by operating the operating member, the main spring of the circuit breaker applies a force to the link mechanism, thereby being able to manually operate or take off when a fault occurs in the circuit.
  • the button unit turns the contact mechanism on or off.
  • a circuit breaker includes: a movable contact, a fixed contact, a rotating shaft, and an operating mechanism, the movable contact being rotatable about a rotating center of the rotating shaft with respect to the stationary contact Rotating, through contact or disconnection between the moving contact and the stationary contact,
  • the circuit is turned on or off;
  • the operating mechanism includes an upper link, a lower link and a handle, the upper link is arranged to be rotatable around one end of the upper link under the driving action of the handle, and the other end of the upper link is connected through the connecting rod
  • the hinge shaft is rotatably coupled to one end of the lower link, and the other end of the lower link is hinged to the rotating shaft such that the upper link and the lower link are configured to drive the rotating shaft to rotate the movable contact, wherein the upper link The working length and the working length of the lower link, and the working length of the upper link and the distance between the hinge point of the lower link and the rotating shaft to the
  • the ratio of the working length of the upper link to the working length of the lower link is greater than 0.78, and the ratio of the working length of the upper link and the distance between the hinge position of the lower link and the rotating shaft to the center of rotation of the rotating shaft is greater than 1.28.
  • the ratio of the working length of the upper link to the working length of the lower link is 0.95, the ratio of the working length of the upper link and the distance between the hinge position of the lower link and the rotating shaft to the center of rotation of the rotating shaft 1.57.
  • the circuit breaker further includes a jumper, the jumper is rotatably disposed in the circuit breaker, one end of the upper link is hinged with the jump buckle, and the limit jumper is further disposed on the jump buckle, the limit slip
  • the track limits the range of motion of the link hinge axis by the limit to define the range of motion of the upper link.
  • the circuit breaker further includes a jumper hinge shaft for connecting the jumper, and the jumper hinge shaft is capable of restricting the upper link from continuing to rotate in a contact state of the movable contact and the fixed contact.
  • the circuit breaker further includes an anti-back spray component, the anti-back spray component is disposed on the movable contact, and is rotatable together with the movable contact for blocking the separation of the movable contact and the static contact The arc moves towards the side of the operating mechanism.
  • the anti-back spray component is a curved plate having opposing concave and convex arcuate faces.
  • the circuit breaker further includes a guiding member that is in contact with a surface of the anti-backwashing member to guide the movement of the anti-backwashing member.
  • the guiding member is disposed on the rotating shaft and has a convex arc guiding surface, and the concave curved surface substantially slides against the convex guiding surface during the rotation of the anti-backwashing member along with the moving contact.
  • the guiding member has a concave arc guiding surface, which is provided in the anti-spraying member During the rotation of the movable contact, the convex arc surface substantially slides on the concave arc guiding surface.
  • the circuit breaker provided by the embodiment of the invention increases the ratio between the working lengths of the respective connecting links of the link mechanism in the operating mechanism for driving the movable contact and the fixed contact to contact and open.
  • the contact angle increases the opening distance of the moving contact and the static contact in the off state to ensure that the circuit breaker can effectively improve the breaking capacity and the reliability of the breaking while satisfying the miniaturization requirement.
  • FIG. 1 is a schematic view showing the internal structure of a circuit breaker closing state according to an embodiment of the present invention
  • Figure 2 is a schematic structural view of the movable contact of the circuit breaker shown in Figure 1;
  • Figure 3 (a) is a structural schematic view showing one axial side direction of the anti-back spray member of the circuit breaker shown in Figure 1, and (b) is another axis showing the anti-back spray member of the circuit breaker shown in Figure 1. Schematic diagram of the lateral direction;
  • Figure 4 is a schematic view showing the structure of the rotating shaft of the circuit breaker shown in Figure 1;
  • Figure 5 is a schematic structural view of a holding member of the circuit breaker shown in Figure 1;
  • Figure 6 is a schematic view showing the closing state of the operating mechanism when the circuit breaker shown in Figure 1 is in the closed state;
  • FIG. 7 is a schematic structural view showing a jumper according to an embodiment of the present invention.
  • FIG. 8 is a schematic view showing the internal structure of a circuit breaker opening state according to an embodiment of the present invention.
  • Figure 9 is a schematic view showing the opening state of the operating mechanism when the circuit breaker shown in Figure 1 is in the open state;
  • Figure 10 is a schematic view showing the movement of the link mechanism of the circuit breaker shown in Figure 1;
  • Figure 11 (a) is a simplified schematic view showing the ratio of the respective working lengths of the respective link members of the link mechanism according to an embodiment of the present invention, and (b) is shown in accordance with the prior art. A simplified schematic diagram of the ratio of working length ratios of respective links of the linkage mechanism.
  • FIG. 1 is a schematic diagram showing the internal structure of a circuit breaker 100 in a closed state according to an embodiment of the present invention.
  • the circuit breaker 100 includes a movable contact 21, a stationary contact 22, an operating mechanism 30, a trip unit, and an arc extinguishing mechanism.
  • the moving circuit 21 and the static contact 22 are electrically connected to the power source side terminal and the load side terminal, respectively, to form a main circuit of the circuit breaker 100, and the circuit can be connected to the main circuit of the circuit breaker 100 by the trip unit.
  • the moving contact 21 and the static contact 22 are disconnected in time by the tripping action, thereby realizing protection of each component and load in the circuit, so that the circuit breaker 100 can operate the operating mechanism when needed.
  • 30 disconnects the movable contact 21 and the fixed contact 22, cuts off the current of the main circuit, and protects the safety of the lower-level electrical device and the load.
  • the circuit breaker 100 has a housing 11 as an external protection structure.
  • the housing 11 is made of an insulating material, and is formed with a base 11a and a cover 11b.
  • the base 11a and the cover 11b together form an accommodation space.
  • the components of the circuit breaker 100 are housed therein.
  • a first terminal 12 and a second terminal 13 are respectively disposed inside the casing 11 corresponding to the power supply side and the load connection side, and the first terminal 12 and the second terminal 13 are respectively disposed at opposite ends of the casing 11 At the edge for electrical connection to the outer conductor.
  • the first connection terminal 12 and the second connection terminal 13 may not be disposed at opposite ends of the housing 11, and illustratively, they may be disposed on the same side in the housing, or Set in other parts inside the housing, as long as the circuit breaker is electrically connected to the external power supply and load Just fine.
  • One end of the static contact 22 faces the movable contact 21 and is provided with a static contact 221 , and the other end extends toward the first connection terminal 12 and is electrically connected to the first connection terminal 12 .
  • One end of the movable contact 21 is rotatably held by the rotating shaft 34 inside the casing 11, the other end is disposed with the movable contact 211 facing the static contact 22, and the movable contact 21 is electrically connected with the second connecting terminal 13 so that the first wiring is
  • a main circuit of the circuit breaker 100 is formed between the terminal 12 and the second terminal 13, and the movable contact 211 and the stationary contact 221 cooperate to form an opening and closing contact for controlling the on/off of the main circuit.
  • FIG. 2 is a schematic structural view of a movable contact 21 according to an embodiment of the present invention.
  • One end of the movable contact 21 and the fixed contact 22 is set as a contact end 215, and away from the contact end 215.
  • One end connected to the rotating shaft 34 is a fixed end 216, and the arc-distributing member 23 is disposed near the side of the contact end 215.
  • the arc-dissipating member 23 encloses the moving contact 21 in a three-sided wrapping manner for avoiding the moving contact 21
  • the arc generated at the moment of separation from the stationary contact 22 is damaged by the movement of the stationary contact 221 toward the body of the movable contact 21, resulting in a decrease in the life of the movable contact and a reduction in the final pressure between the contact points. .
  • the figure is exemplarily illustrated by a single-pole circuit breaker structure.
  • the circuit breaker may be disposed as a multi-pole and arranged side by side on the base and connected to the circuit.
  • the number of poles corresponds to the various contact mechanisms.
  • the circuit breaker can be set as a three-pole circuit breaker, and the three-pole circuit needs to be configured with three contact mechanisms, three pairs of terminals, and the like, wherein the contact mechanisms of the poles are set to be the same as each other.
  • the rotating shaft can be arranged in a manner orthogonal to the respective pole contact mechanisms, thereby driving the contact mechanism of each pole through a rotating shaft (shown in FIG. 4), and corresponding to the middle moving contact and the static
  • the connecting mechanism is connected to the operating mechanism to drive the rotating shaft to rotate.
  • the anti-back spray member 70 for preventing the arc generated when the movable contact 21 and the fixed contact 22 are disconnected from moving toward the side of the operating mechanism 30 is further provided on the movable contact 21, that is, preventing The arc moves toward the illustrated shaft 34 and the link mechanism side.
  • FIG. 3(a) is a structural schematic view showing an axial side direction of the anti-back spray member 70 of the circuit breaker 100 according to an embodiment of the present invention
  • (b) is a view showing the anti-back spray member.
  • the anti-back spray member 70 is an arc-shaped plate-like structure having a concave curved surface 73a and a convex curved surface 73b, and is provided at an intermediate position near one of the narrower edges of the anti-back spray member 70 for actuation.
  • the opening 71 is attached to the shape of the movable contact 21, and after installation, the anti-back spray member 70 is located close to the arc-closing member 23.
  • the end 216 is on one side, and the top edge 72 of the opening 71 is hung on the top end surface 214 of the movable contact 21, and the arc-dissipating member 23 can be used as a limiting member at this time to prevent the anti-back spray member 70 from moving along the longitudinal direction of the movable contact 21.
  • the movable contact 21 is detached from the side of the contact end 215, so that the movable contact 21 can fix the position of the anti-back spray member 70 without adding other additional limit structures.
  • the concave arc surface 73a and the convex arc surface 73b of the anti-back spray member 70 are respectively arranged to guide the arc-shaped motion track.
  • a guiding member disposed on both sides of the anti-back spray member 70 in the longitudinal direction of the movable contact 21, respectively contacting the surface of the anti-back spray member 70 from two directions, thereby guiding the anti-back spray member 70 sports.
  • the guide member is provided with a convex arc guiding surface 352 corresponding to the concave curved surface 73a, and guides the movement of the concave arc surface 73a side of the back spray prevention member 70.
  • FIG. 4 is a schematic structural view showing a rotating shaft 34 according to an embodiment of the present invention.
  • the rotating shaft 34 can drive the moving contact 21 of the multi-pole circuit breaker to rotate.
  • the rotating shaft 34 is respectively provided with an auxiliary guiding member 35, and the auxiliary guiding member 35 is composed of the rotating shaft.
  • the fan-shaped structure that is protrudedly disposed on the 34 may be an integral structure or a separate structure with the rotating shaft 34.
  • a side of the auxiliary guiding member 35 away from the rotating shaft 34 is formed with a convex arc guiding surface 352 by two edges of the sector structure, and a portion between the sector structures is provided with a fixing groove 351 for receiving the movable contact 21, and the movable contact 21
  • the fixed end 216 is elastically coupled to the rotating shaft 34 through the fixing holes 212 and 213 and the contact spring, so that when the moving contact 21 is in full contact with the fixed contact 22, the movable contact 21 is allowed to be properly synchronized with the rotating shaft 34.
  • the movable contact 21 is allowed to undergo an elastic movement toward the disconnected position that is out of synchronization with the rotary shaft 34.
  • the arc of the convex arc guiding surface 352 is arranged corresponding to the arc of the concave arc surface 73a of the anti-back spray member 70, so that the anti-back spray member 70 guides the concave arc surface 73a and the convex arc during the rotation of the moving contact 21.
  • the face 352 can slide substantially in a snug manner, and does not affect the contact pressure value of the movable contact 21 due to unnecessary floating of the anti-back spray member 70 during the rotation, so that the anti-back spray member is more firmly connected. At the same time, it can more effectively prevent the arc from damaging parts such as the shaft or the linkage mechanism.
  • the auxiliary guiding member 35 has a fan-shaped structure having a receiving groove 351 for accommodating the movable contact 21, and a sliding track for the anti-jetting member 70 by an end surface protruding along the side of the rotating shaft 34.
  • the motion trajectory of the anti-back spray member 70 is guided, but the present invention is not limited thereto.
  • the auxiliary guide member may also be provided with a semicircular shape that is protruded from the rotation shaft 34 corresponding to the anti-back spray member.
  • the double-slide structure or the rectangular double-slide structure, or other structure having a sliding guide surface can also achieve the mounting of the movable contact 21 and guide the movement path of the anti-back spray member 70.
  • FIG. 5 is a schematic structural view of a holding member 80 of the circuit breaker 100 according to an embodiment of the present invention.
  • the holding member 80 is an insulating plate-like structure, which is disposed in the housing 11 near the contact end 215 side of the movable contact 21, and the width of the corresponding moving contact 21 on the holding member 80 is provided with an elongated slit.
  • the slit 81 is such that the upper end of the holding member 80 is a joint structure, and the lower end is a split structure, and the movable contact 21 can be longitudinally penetrated into the slit 81 by the contact end 215 thereof, so that the movable contact 21 surrounds the first fixing.
  • the contact end 215 is kept in the range of the slit 81, and the end surface of the holding member 80 facing the rotating shaft 34 is protrudedly provided with two supporting plates, and the extending edges of the two supporting plates are correspondingly prevented.
  • the convex arc surface 73b of the reverse spray member 70 forms a concave arc guide surface 82 such that the convex arc surface 73b of the anti-back spray member 70 substantially conforms to the concave arc guide surface 82 after the movable contact 21 is fitted to the holding member 80. Therefore, during the rotation of the anti-back spray member 70 along with the movable contact 21, the convex arc surface 73b and the concave arc guiding surface 82 slide substantially in a snug manner, and the anti-back spray member 70 does not become unnecessary during the rotation process.
  • the anti-back spray member 70 is a curved plate-like structure for preventing the arc generated by the movable contact and the fixed contact at the moment of separation from moving toward the side of the operating mechanism, but the anti-back spray member of the present invention
  • the structure is not limited thereto.
  • the anti-back spray structure may also be a flat structure or other forms of plate or block structure, and the movable contact can be prevented as well. The arc generated when the stationary contact is opened moves toward the side of the operating mechanism.
  • FIG. 6 is a schematic view showing the closing state of the operating mechanism 30 in the closed state of the circuit breaker 100 according to an embodiment of the present invention.
  • the operating mechanism 30 includes a handle 311, a lever 38, a jumper 37, a link mechanism, and a main spring (not shown) and the like.
  • the lever 38 is rotatably disposed inside the housing 11 and is detachably coupled to the handle 311.
  • the jumper 37 is rotatably coupled to the inside of the housing 11 and hinged to the upper link 32.
  • the handle 311 is from the cover. The top end surface of the 11b is exposed to facilitate the rotation of the lever 38 by an external force.
  • each link mechanism includes an upper link 32 and a lower link 33 that are interlocked with each other.
  • One end of the link 32 is rotatably supported by the second fixed fulcrum C, and the other end thereof is rotatably hinged with the lower link 33 via the link hinge shaft 36, and the center of the link hinge shaft 36 is set as the movable fulcrum B.
  • FIG. 7 a schematic structural diagram of a jumper 37 according to an embodiment of the present invention is shown.
  • a limit position slide is further disposed on the jump buckle 37, and the limit slide passes through three limits. The position is limited by the axial movement of the link hinge shaft 36 and its range of motion under the action of the main spring drive, thereby limiting the range of motion of the upper link 32.
  • the jumper 37 has two transitional and symmetric connecting side walls, and the two limiting slides are respectively disposed on the connecting side walls corresponding to the two side link mechanisms, and the illustrated lateral limiting surface 371 is used.
  • the front end limiting surface 372 is used to restrict the upper link 32 to stop at the opening position, and the rear end limiting surface 373 It is used to limit the upper link 32 to stop at the closing position, thereby achieving accurate positioning of the branching and closing positions of the link mechanism.
  • the jumper 37 is rotatably disposed in the housing 11 through a jumper hinge shaft 39, and the jumper hinge shaft 39 can simultaneously serve as a limit structure of the upper link 32, and can be coupled with the upper link.
  • the groove fit on the 32 is used to stop the upper link 32 in the closed position, so that the rear end limit surface 373 can be replaced.
  • the lower link 33 is hinged to the rotating shaft 34 by a connecting hole 353 (shown in FIG. 4) provided on the auxiliary guiding member 35, so that the movable contact 21 can be rotated by the rotating shaft 34.
  • a driving side of a main spring (not shown) is fixed to a spring fixing portion (not shown) of the lever, and a driven side thereof is coupled to the link hinge shaft 36 to apply tension to the link hinge shaft 36. force.
  • the link mechanism can drive the rotating shaft 34 to rotate the movable contact 21.
  • FIG. 8 is a diagram showing the opening of the circuit breaker 100 according to an embodiment of the present invention. Schematic diagram of the internal structure of the state;
  • FIG. 9 is a schematic view showing the opening state of the operating mechanism 30 when the circuit breaker 100 is in the open state according to an embodiment of the present invention;
  • FIG. 10 is a view showing the connecting rod according to an embodiment of the present invention. A motion diagram of the state of stress on the mechanism.
  • the action of the operating mechanism 30 can be simplified to the movement of the state of the link mechanism shown in FIG.
  • the G point corresponds to the driving side connection point of the main spring
  • the C point corresponds to the second fixed fulcrum of the upper link 32
  • the B point corresponds to the upper link 32 and the lower link 33.
  • the hinge point between the link hinge shaft 36, the point A corresponds to the hinge point between the lower link 33 and the shaft 34, that is, the hinge position of the shaft 34, and the point O corresponds to the rotation center line of the shaft 34, and It is also the first fixed fulcrum, whereby the positions of the first fixed fulcrum O and the second fixed fulcrum C are fixed, so that a four-bar linkage mechanism is formed between CB, BA, OA, and CO, wherein the working length of the upper link 32 is The length of the line between the hinge point of the upper link 32 and the link hinge shaft 36 is referred to, and the working length of the lower link 33 is the length of the line between the link hinge axis 36 and the hinge position A of the shaft 34.
  • the three lines GB, GB1, and GB' in Fig. 10 are the tensile force acting lines of the main spring to the link hinge shaft 36 corresponding to the movement of the link mechanism to the opening position, the intermediate position and the closing position (spring)
  • the three indirect connecting lines of CA, CA1 and CA' in the figure are respectively the movement of the link mechanism to the opening position, the intermediate position and the closing position, and the tension of the main spring to the connecting rod hinge shaft 36 is even
  • the shape of the different connection structures presented by the rod mechanism; the three lines of OA, OA1, OA' in the figure are respectively when the link mechanism moves to the opening position, At the intermediate position and the closing position, under the driving action of the main spring, the distance between the hinge position of the lower link 33 and the rotating shaft 34 to the rotation center O of the rotating shaft 34 forms an opening position, an intermediate position, and
  • the switch-on position also the three positions where the movable contact is located, wherein the angle at which the movable contact 21 (ie, the shaft rod) is
  • the linkage mechanism By operating the handle 311 to rotate to the on position (shown in Figure 6) or the off position (shown in Figure 9), the linkage mechanism can be switched to the closing position or the opening position, and the linkage mechanism works in two Switching between positions causes the entire circuit breaker 100 to be in a closed state or an open state, and the contact or disconnection between the movable contact 21 and the fixed contact 22 is achieved by the cooperation of the main springs. Specifically, when the linkage mechanism of the operating mechanism 30 needs to move from the opening position to the closing position, the handle 311 is pushed from the off position of FIG. 9 to the on position of FIG.
  • the lever hinge shaft 36 applies a pulling force to quickly drive the upper link 32 and the lower link 33 from the curved state shown in FIG. 9 to the extended state shown in FIG. 6, and drives the rotating shaft 34 and the movable contact 21 to rotate counterclockwise.
  • the movable contact 211 is brought into contact with the stationary contact 221.
  • the CB and BA which are hingedly connected at the bending position are pulled together, and reach the CB' and A'B' after passing through the intermediate position where CB1 and A1B1 are located.
  • the extended position due to the pulling force at point G to point B, the CB and BA which are hingedly connected at the bending position are pulled together, and reach the CB' and A'B' after passing through the intermediate position where CB1 and A1B1 are located.
  • the operating mechanism 30 in the circuit breaker 100 sets the moving contact angle to be greater than 30° by having a predetermined proportional relationship between the respective link operating lengths of the link mechanism.
  • FIG. 11(a) is a simplified structural diagram showing the configuration of each corresponding link working length of the link mechanism according to an embodiment of the present invention, and (b) is shown.
  • the rotational angle of the movable contact of the prior art link mechanism is usually 30, the ratio of the CB to the AB working length is 0.78, and the ratio of the CB to OA working length is 1.28.
  • the ratio of the working length of the upper link 32 and the lower link 33 of the link mechanism of the embodiment of the present invention is set to Greater than 0.78, and the ratio between the working length of the upper link 32 and the distance between the hinge position A of the shaft (ie, the shaft 34) and the first fixed fulcrum O (ie, the ratio of the length of the CB to the OA) is set to be greater than 1.28.
  • the working length values of the respective links are exemplarily selected, and as shown in the figure, the working length ratio relationship of each corresponding connecting rod is calculated as shown in Table 1 below.
  • the calculated link mechanism is at the moving contact rotation angle at the branching and closing positions, the swing angle of the upper link 32 ( ⁇ BCB'), and between them.
  • the proportional relationship is shown in Table 2 below.
  • the ratio of the working length of the lower link 33 (i.e., the ratio of the length between the illustrated CB and AB) is set to 0.95, and the working length of the lower link 33 and the hinge position of the rotating shaft to the first fixed fulcrum are set to 0.95.
  • the ratio value of the distance between 0 that is, the ratio of the length between the CB and the OA shown in the figure
  • the link mechanism can achieve an increase in the continuity of the prior art solution.
  • the contact angle increases the breaking performance and the breaking reliability of the circuit breaker 100, and optimizes the force transmission efficiency of the link mechanism to the main spring.
  • the moving contact angle of the movable contact 21 is larger than the swing angle of the upper link 32 compared to the prior art solution, that is, the implementation of the present invention
  • the circuit breaker in the example can achieve a larger moving contact angle with a smaller upper link swing angle than a circuit breaker of the same volume. Therefore, the circuit breaker of the embodiment of the invention can realize a larger opening distance of the contact mechanism in the breaking process while having a smaller volume, and greatly improve the breaking performance of the circuit breaker.
  • the circuit breaker 100 sets the working length ratio of the upper link 32 and the lower link 33 to be greater than 0.78, the working length of the upper link 32 and the hinge position A of the first fixed fulcrum O to the rotating shaft 34.
  • the ratio of the length of the interval is set to be greater than 1.28 to make the moving contact angle greater than 30°, but the invention is not limited thereto, and in other embodiments, the manner of changing the ratio of the working length of the corresponding link of the link mechanism may also be adopted. Adjusting the ratio of the working length ratio between the upper and lower links and the length between the first fixed fulcrum O and the hinge position A of the rotating shaft 34 to other proportional relationships as long as it can ensure the corner of the moving contact More than 30 ° can be.
  • the tensile force transmission efficiency of the four-bar linkage mechanism for the main spring can be calculated, wherein the transmission efficiency is divided into four-bar linkage mechanism startup (contact mechanism The transfer efficiency of the disconnected state and the transfer efficiency at the time of closing the dead spot (when the contact mechanism is just in contact), the transfer efficiency is calculated as follows:
  • ⁇ 1 and ⁇ 2 are the acute angles of CB and F and the angle between AB and OA respectively; ⁇ 4 and ⁇ 5 are the acute angles between CB' and F' and A'B' and OA'; 5 and ⁇ 6 are obtuse angles between CB and BA and CB' and A'B'; d(OA), d(OA'), d(GB), d(GB') represent geometric distance; d 0 represents main The initial length of the spring.
  • the two failure modes that are easily generated by the four-bar linkage mechanism in the circuit breaker are: 1 the handle is turned to the closing position, but the four-bar linkage mechanism is not responding. 2 After the closing operation of the four-bar linkage mechanism, the predetermined closing position (extension position of the link mechanism) is not reached, that is, the false closing is performed.
  • the transmission efficiency of the four-bar linkage mechanism in the invention is not less than 0.84F, and the transmission efficiency at the dead-point position is not less than 3.52F. .
  • the moving contact angle of the present invention is greater than 30°, and the circuit breaker 100 of the embodiment of the present invention can ensure the initial spring state (the moment when the static contact and the movable contact just contact after the closing operation), the main spring is switched to The torque and final pressure of the rotating shaft 34 are converted to the rotating shaft 34.
  • the ratio of the counter moments is greater than one. Therefore, the link mechanism of the circuit breaker in the embodiment of the present invention can avoid the occurrence of the above two failure modes.
  • the circuit breaker of the embodiment of the present invention optimizes the connection by changing the ratio of the working length between the respective links in the operating mechanism for driving the movable contact and the fixed contact to contact and open.
  • the force transmission efficiency of the rod mechanism to the main spring increases the opening distance formed between the moving contact and the static contact in the disconnected state, so as to ensure that the circuit breaker can effectively improve the breaking capacity and the reliability of the breaking while satisfying the miniaturization requirement. Sex.

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  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

La présente invention concerne un disjoncteur (100) qui comporte un contact mobile (21), un contact fixe (22), une broche (34) et un mécanisme d'actionnement (30). Le contact mobile (21) peut tourner, par rapport au contact fixe (22), autour d'un centre de rotation (0) de la broche (34). La mise en marche ou la coupure d'un circuit est exécutée au moyen de la mise en contact ou de la séparation du contact mobile (21) et du contact fixe (22). Le mécanisme d'actionnement (30) comprend une bielle supérieure (32), une bielle inférieure (33) et une manivelle (311). La bielle supérieure (32) est agencée de telle sorte qu'elle peut tourner autour d'une extrémité de la bielle supérieure (32) sous l'action d'entraînement de la manivelle (311), et l'autre extrémité de la bielle supérieure (32) est reliée de manière rotative à une extrémité de la bielle inférieure (33) au moyen d'un arbre articulé de bielle (36), de sorte que l'autre extrémité de la bielle inférieure (33) est articulée sur la broche (34) et peut entraîner cette dernière à entraîner le contact mobile (21) de manière à ce qu'il tourne. La longueur de travail de la bielle supérieure (32) et la longueur de travail de la bielle inférieure (33), ainsi que la longueur de travail de la bielle supérieure (32) et une distance d'un point (A) où la bielle inférieure (33) et la broche (34) sont articulées, au centre de rotation (0) de la broche (34) ont une relation proportionnelle prédéterminée, de telle sorte qu'un angle de rotation, formé après que le contact mobile (21) est séparé du contact fixe (22), du contact mobile (21) est supérieur à 30 degrés. Ainsi, l'objectif d'amélioration de la capacité de coupure du disjoncteur est atteint.
PCT/CN2017/109955 2016-11-09 2017-11-08 Disjoncteur WO2018086539A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AU2017332969A AU2017332969B2 (en) 2016-11-09 2017-11-08 Circuit breaker
RU2018115183A RU2683244C1 (ru) 2016-11-09 2017-11-08 Автоматический выключатель
BR112018006518A BR112018006518A2 (pt) 2016-11-09 2017-11-08 disjuntor
SG11201802880XA SG11201802880XA (en) 2016-11-09 2017-11-08 Circuit breaker
UAA201803893A UA122156C2 (uk) 2016-11-09 2017-11-08 Автоматичний вимикач
ZA2018/02281A ZA201802281B (en) 2016-11-09 2018-04-06 Circuit breaker

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610997503.XA CN106571274B (zh) 2016-11-09 2016-11-09 断路器
CN201610997503.X 2016-11-09

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WO2018086539A1 true WO2018086539A1 (fr) 2018-05-17

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BR (1) BR112018006518A2 (fr)
RU (1) RU2683244C1 (fr)
SG (1) SG11201802880XA (fr)
UA (1) UA122156C2 (fr)
WO (1) WO2018086539A1 (fr)
ZA (1) ZA201802281B (fr)

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CN106571274B (zh) * 2016-11-09 2019-04-23 北京人民电器厂有限公司 断路器
CN107978467A (zh) * 2017-12-27 2018-05-01 浙江上图电气科技有限公司 一种联动导电系统装置

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US20110273249A1 (en) * 2010-05-06 2011-11-10 Hubei Shengjia Electric Apparatus Co., Ltd. Circuit breaker with secondary protection function
CN202013857U (zh) * 2011-05-12 2011-10-19 常熟开关制造有限公司(原常熟开关厂） 结构改良的断路器操作机构
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CN106571274A (zh) * 2016-11-09 2017-04-19 北京人民电器厂有限公司 断路器

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CN106571274B (zh) 2019-04-23
BR112018006518A2 (pt) 2018-10-09
ZA201802281B (en) 2019-06-26
SG11201802880XA (en) 2018-06-28
AU2017332969B2 (en) 2019-01-24
AU2017332969A1 (en) 2018-05-24
CN106571274A (zh) 2017-04-19
RU2683244C1 (ru) 2019-03-27

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