Circuit breaker

Abstract

The utility model belongs to the technical field of circuit breakers, and discloses a circuit breaker, which comprises a shell, a draw bar, an arc extinguish chamber and a tripping driving piece, the draw bar, the arc extinguish chamber and the tripping driving piece are arranged in the shell, the tripping driving piece comprises a movable plug and a driving rod, the arc extinguish chamber is provided with an air hole, and a first end of the driving rod is connected with the movable plug. The second end of the driving rod is arranged corresponding to the tripping part of the traction rod, gas generated in the arc extinguish chamber is exhausted through the gas hole and used for pushing the movable plug to move, and the movable plug is configured to drive the driving rod to move and press the tripping part downwards so as to drive the traction rod to be tripped. The circuit breaker provided by the utility model is simple in structure, high in breaking efficiency and quick in response, and realizes quick tripping in a pneumatic mode.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a circuit breaker. Background Technology

[0002] Circuit breakers are widely used in industry, agriculture, transportation, mining, construction and national defense. They have multiple protection functions such as overload, short circuit and undervoltage protection, adjustable operating values, high breaking capacity, and are convenient and safe. They are the most widely used products in low-voltage electrical appliances.

[0003] In the existing technology, the tripping mechanism of circuit breakers is generally set to mechanical. This setting causes a certain delay in the tripping action, which cannot meet the requirements of rapid tripping and thus affects the efficiency of disconnection response in case of an accident. Utility Model Content

[0004] The purpose of this invention is to provide a circuit breaker with a simple structure, which achieves rapid tripping through pneumatic means, has high breaking efficiency, and responds quickly.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A circuit breaker includes a housing and a traction rod, an arc-extinguishing chamber, and a tripping drive element disposed within the housing; wherein,

[0007] The tripping drive includes a movable plug and a drive rod. The arc-extinguishing chamber has an air hole. The first end of the drive rod is connected to the movable plug, and the second end of the drive rod is correspondingly arranged with the tripping part of the traction rod.

[0008] The gas generated in the arc-extinguishing chamber is discharged through the air hole to push the movable plug to move. The movable plug is configured to drive the drive rod to move and press down the release part to drive the traction rod to release.

[0009] Preferably, the tripping drive further includes an elastic element, the first end of which is connected to the housing, and the second end of which is connected to the movable plug. The elastic element is used to drive the movable plug to reset.

[0010] Preferably, the elastic element is a spring.

[0011] Preferably, the movable plug has an insertion hole, and the first end of the drive rod is fixedly inserted into the insertion hole.

[0012] Preferably, the housing has a groove, the movable plug is located in the groove, and the air hole is connected to the groove. The gas generated in the arc-extinguishing chamber is discharged through the air hole, which pushes the movable plug to slide relative to the groove, so that the drive rod moves and presses down the tripping part.

[0013] Preferably, the movable plug is hinged to the housing. The gas generated in the arc-extinguishing chamber is discharged through the air hole, which pushes the movable plug to swing upward on the side away from the tripping part, and causes the movable plug to swing downward on the side facing the tripping part so that the drive rod presses down on the tripping part.

[0014] Preferably, the device further includes a second electrical connector and a current transformer. The second electrical connector includes a plurality of conductive elements, which are spaced apart along a first direction. Each conductive element includes a first conductive portion extending along a second direction. The device has a plurality of current transformers, each corresponding to one of the first conductive portions. The current transformer is sleeved on the first conductive portion of the corresponding conductive element, and the current transformer's axis is parallel to the second direction.

[0015] The first direction is perpendicular to the second direction.

[0016] Preferably, it also includes a zero-sequence current transformer, the conductive element includes a second conductive portion extending along a third direction, the second conductive portion is connected to the first conductive portion, the zero-sequence current transformer is sleeved on a plurality of second conductive portions, and the axial direction of the zero-sequence current transformer is parallel to the third direction;

[0017] The first direction, the second direction, and the third direction are set orthogonally to each other.

[0018] Preferably, a third conductive part is connected between the first conductive part and the second conductive part, and the zero-sequence current transformer is supported on a plurality of the third conductive parts.

[0019] Preferably, the end of the second conductive part facing away from the first conductive part is connected to a conductive connection terminal that extends out of the housing.

[0020] Beneficial effects:

[0021] The circuit breaker provided by this utility model is equipped with a tripping drive component, which includes a movable plug and a drive rod. The drive rod is connected to the movable plug, and its end corresponds to the tripping part of the traction rod. When a fault occurs in the circuit connected to the circuit breaker, extremely high arc voltage and arc energy will occur, causing the internal metal material to evaporate, break down, and melt, forming a high temperature and strong arc. These reactions will decompose oxygen in the air into nitrogen and oxygen. The oxygen will then react chemically with the metal on the surface of the material, producing gas and releasing energy. A large amount of gas generated in the arc-extinguishing chamber will be discharged through the vent, pushing the movable plug to move relative to the housing, thereby driving the drive rod to move and press down on the tripping part, which in turn drives the traction rod to trip, completing the tripping operation. The above process quickly realizes the tripping action of the circuit breaker through pneumatic means, effectively ensuring breaking efficiency, achieving rapid tripping, and providing a fast response. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the circuit breaker provided by this utility model;

[0023] Figure 2 This is a partial structural diagram of the circuit breaker provided by this utility model from one perspective;

[0024] Figure 3 This is a partial structural diagram of the circuit breaker provided by this utility model from another perspective;

[0025] Figure 4 This is a structural cross-sectional view of the circuit breaker provided by this utility model;

[0026] Figure 5 This is a partial structural cross-sectional view of the circuit breaker provided by this utility model;

[0027] Figure 6 This is a schematic diagram of the operating mechanism of the circuit breaker provided by this utility model;

[0028] Figure 7 This is a cross-sectional schematic diagram of the operation of the tripping drive component provided by this utility model;

[0029] Figure 8 This is a structural cross-sectional view of a circuit breaker provided in another embodiment of the present invention;

[0030] Figure 9 This is a partial structural cross-sectional view of a circuit breaker provided in another embodiment of the present invention;

[0031] Figure 10 This is a cross-sectional schematic diagram of the operation of the tripping drive component provided in another embodiment of this utility model;

[0032] Figure 11 This is a schematic diagram of the internal structure of the circuit breaker provided by this utility model;

[0033] Figure 12 This is an exploded view of the internal structure of the circuit breaker provided by this utility model.

[0034] In the picture:

[0035] 1. Housing; 101. Slide groove;

[0036] 2. First electrical connection;

[0037] 3. Second electrical connector; 31. Conductive component; 311. First conductive part; 312. Second conductive part; 313. Third conductive part; 314. Conductive connection terminal;

[0038] 4. Towing rod; 41. Release part; 411. Drive plate; 412. Abutment part; 42. Jumper; 43. Lock; 431. Clearance groove;

[0039] 5. Arc-extinguishing chamber; 51. Vent;

[0040] 6. Tripping drive component; 61. Movable plug; 611. Socket; 62. Drive rod; 621. Drive head; 63. Elastic component;

[0041] 7. Current transformer;

[0042] 8. Zero-sequence current transformer. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0044] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0047] This embodiment provides a circuit breaker. (Refer to...) Figures 1 to 12 As shown, the circuit breaker includes a housing 1 and a traction rod 4, an arc-extinguishing chamber 5, and a tripping drive 6 disposed within the housing 1. The tripping drive 6 includes a movable plug 61 and a drive rod 62. The arc-extinguishing chamber 5 has an air hole 51. The first end of the drive rod 62 is connected to the movable plug 61, and the second end of the drive rod 62 is correspondingly positioned with respect to the tripping portion 41 of the traction rod 4. Gas generated within the arc-extinguishing chamber 5 is discharged through the air hole 51 to push the movable plug 61 to move. The movable plug 61 is configured to drive the drive rod 62 to move and press down on the tripping portion 41 to cause the traction rod 4 to trip.

[0048] Specifically, the circuit breaker also includes a first electrical connector 2 and a second electrical connector 3 disposed in the housing 1. The first electrical connector 2 and the second electrical connector 3 are respectively used to connect external electrical equipment and power supply. The tripping of the traction rod 4 can cut off the electrical conduction between the first electrical connector 2 and the second electrical connector 3.

[0049] In this embodiment, the drive rod 62 is connected to the movable plug 61, and its end corresponds to the tripping part 41 of the traction rod 4. When a fault occurs in the circuit connected to the circuit breaker, extremely high arc voltage and arc energy will occur, causing the internal metal material to evaporate, break down, and melt, forming a high temperature and strong arc. These reactions will decompose the oxygen in the air into nitrogen and oxygen, where the oxygen will react chemically with the metal on the surface of the material to produce gas and release energy. A large amount of gas generated in the arc-extinguishing chamber 5 is discharged through the vent 51, pushing the movable plug 61 to move relative to the housing 1, thereby driving the drive rod 62 to move and press down the tripping part 41, thereby driving the traction rod 4 to trip, cutting off the electrical conduction between the first electrical connector 2 and the second electrical connector 3, and completing the tripping operation. The above process quickly realizes the tripping action of the circuit breaker through pneumatic means, effectively ensuring the breaking efficiency, achieving rapid tripping, and responding quickly.

[0050] Specifically, the operating mechanism also includes a base frame (not shown), a jump buckle 42, a latch 43, a moving contact (not shown), and a stationary contact (not shown). The base frame is fixed inside the housing 1. The jump buckle 42 and latch 43 are hinged to the base frame. The latch 43 has a clearance groove 431, and a corresponding abutment portion 412 is provided on the release portion 41. An elastic reset member (not shown) is provided between the latch 43 and the base frame. The elastic reset member ensures that the latch 43 always tends to swing towards the release portion 41. When the drive rod 62 moves and presses down on the tripping part 41, the traction rod 4 swings as a whole. Under the action of the elastic reset member, the latch 43 always tends to swing towards the tripping part 41. During this process, the abutment part 412 can enter the clearance hole. The latch 43 swings and disengages from the tripping latch 42, thereby switching the traction rod 4 from the re-clamping position to the tripping position. At this time, the circuit breaker is in the tripped state, and the tripping latch 42 is unlocked and in a free state, separating the moving contact and the stationary contact. When an external force drives the tripping latch 42 to swing, the tripping latch 42 drives the latch 43 to swing in the opposite direction. During this process, the abutment part 412 moves out of the clearance hole, and the traction rod 4 swings in the opposite direction, so that the abutment part 412 abuts against the surface of the latch 43 after moving out of the clearance hole, thereby switching the traction rod 4 from the tripping position to the re-clamping position. At this time, the circuit breaker is in the re-clamping state, and the tripping latch 42 and the latch 43 overlap and cooperate to lock the tripping latch 42. The circuit breaker can then perform normal closing and opening operations.

[0051] Optionally, the drive rod 62 is a copper lead screw. The end of the drive rod 62 facing the tripping part 41 is inclined downward in the direction of the tripping part 41, which makes it easier for the drive rod 62 to contact the tripping part 41.

[0052] In this embodiment, the tripping drive 6 further includes an elastic element 63. The first end of the elastic element 63 is connected to the housing 1, and the second end of the elastic element 63 is connected to the movable plug 61. The elastic element 63 is used to drive the movable plug 61 to return to its original position in the vent 51. Specifically, when the venting in the vent 51 is completed, the elastic element 63 can drive the movable plug 61 to move in the opposite direction and reset.

[0053] In this embodiment, the elastic element 63 is configured as a spring. Specifically, when a large amount of gas is generated in the arc-extinguishing chamber 5 and discharged through the vent 51 to push the movable plug 61 to move relative to the housing 1, the spring is stretched and generates elastic force. When the exhaust in the vent 1 is completed, the spring retracts under the action of the elastic force, driving the movable plug 61 to move in the opposite direction and reset.

[0054] Specifically, in this embodiment, the movable plug 61 has an insertion hole 611, and the first end of the drive rod 62 is fixedly inserted into the insertion hole 611. This insertion connection method is simple, reliable, and easy to disassemble. Besides the insertion method, the movable plug 61 and the drive rod 62 can also be connected using external connectors such as screws; this is not a limitation here.

[0055] In this embodiment, the housing 1 has a sliding groove 101, the movable plug 61 is located in the sliding groove 101, and the air hole 51 is connected to the sliding groove 101. The gas generated in the arc-extinguishing chamber 5 is discharged through the air hole 51, which pushes the movable plug 61 to slide relative to the sliding groove 101, so that the drive rod 62 moves and presses down the release part 41.

[0056] Corresponding to the attached figures, there are a first direction, a second direction, and a third direction, which are arranged orthogonally to each other. In this embodiment, the first direction is the width direction of the circuit breaker, the second direction is the length direction of the circuit breaker, and the third direction is the height direction of the circuit breaker.

[0057] As an optional implementation method, refer to Figures 2 to 7 As shown, the slide groove 101 is opened along a third direction, and the movable plug 61 slides within the slide groove 101. An elastic element 63 is also provided within the slide groove 101, with one end connected to the housing 1 and the other end connected to the movable plug 61. The middle of the drive rod 62 is bent to form a support point A. Specifically, a large amount of gas generated in the arc-extinguishing chamber 5 is discharged through the vent 51 into the slide groove 101. The slide groove 101 is filled with gas and pushes the movable plug 61 to slide upward relative to the slide groove 101, causing the second end of the drive rod 62 to move upward and the support point A in the middle of the drive rod 62 to move upward and abut against the housing 1. Then the movable plug 61 continues to move upward, and the drive rod 62 continues to move under the drive of the second end of the movable plug 61. The support point A abuts against the housing 1 to form a fulcrum, so that the drive rod 62 as a whole makes a seesaw-like movement, thereby causing the first end of the drive rod 62, that is, the end of the movable plug 61 facing the tripping part 41, to swing downward, thereby driving the drive rod 62 to press down on the tripping part 41.

[0058] As an optional implementation method, refer to Figures 8 to 10 As shown, the slide groove 101 is opened along the second direction, and the movable plug 61 slides within the slide groove 101, moving towards or away from the tripping part 41. The first end of the drive rod 62 is bent toward the tripping part 41 to form a drive head 621, and the tripping part 41 is correspondingly provided with a drive plate 411. Specifically, a large amount of gas generated in the arc-extinguishing chamber 5 is discharged through the vent 51 into the slide groove 101. The slide groove 101 is filled with gas, which pushes the movable plug 61 to slide away from the tripping part 41 relative to the slide groove 101, causing the drive rod 62 to move synchronously away from the tripping part 41, thereby causing the drive head 621 to move and abut against the drive plate 411. The drive rod 62 continues to move away from the tripping part 41, allowing the drive head 621 to push against the drive plate 411, thereby providing a downward force to the tripping part 41, thus realizing the downward action of the tripping part 41 and driving the traction rod 4 to trip.

[0059] In one optional implementation, the movable plug 61 is hinged to the housing 1. Gas generated in the arc-extinguishing chamber 5 is discharged through the vent 51, pushing the movable plug 61 to swing upward on the side opposite to the tripping part 41, and causing the movable plug 61 to swing downward on the side facing the tripping part 41, thereby causing the drive rod 62 to press down on the tripping part 41. Specifically, in this embodiment, the movable plug 61 is hinged to the housing 1 via a hinge shaft (not shown). Gas is discharged from the vent 51, which can push the movable plug 61 to swing upward on the side opposite to the tripping part 41, similar to the movement of a seesaw, so that the movable plug 61 simultaneously swings downward on the side facing the tripping part 41, thereby driving the drive rod 62 to press down on the tripping part 41.

[0060] In this embodiment, the elastic element 63 can be configured as a torsion spring. The torsion spring is sleeved on the hinge shaft, with one end connected to the movable plug 61 and the other end connected to the housing 1.

[0061] Optionally, the arc-extinguishing chamber 5 and the shell 1 can also be enclosed together to form a receiving cavity 51, and the movable plug 61 is located inside the receiving cavity 51. The setting of the receiving cavity 51 facilitates the arrangement of the movable plug 61 and provides the movable plug 61 with movement space.

[0062] In this embodiment, reference is made to Figures 11 to 12 As shown, the circuit breaker also includes a current transformer 7. The second electrical connector 3 includes multiple conductive elements 31, which are spaced apart along a first direction. Each conductive element 31 includes a first conductive portion 311 extending along a second direction. Multiple current transformers 7 are provided, each corresponding to one of the first conductive portions 311. The current transformer 7 is sleeved on the first conductive portion 311 of the corresponding conductive element 31, and the axial direction of the current transformer 7 is parallel to the second direction. The first direction is perpendicular to the second direction. Specifically, the current transformer 7 is sleeved on the first conductive portion 311 of the corresponding conductive element 31. By providing the current transformer 7, it can cooperate with measuring instruments to measure the current in the circuit, and cooperate with relay protection devices to provide overload and overcurrent protection for the power system and equipment, ensuring the safe operation of the power system.

[0063] In this embodiment, the second electrical connector 3 includes three conductive elements 31 spaced apart along the first direction, and the number of current transformers 7 is also set to three. The three conductive elements 31 can respectively correspond to the three phases of alternating current.

[0064] Furthermore, the circuit breaker also includes a zero-sequence current transformer 8. The conductive element 31 includes a second conductive portion 312 extending along a third direction, which is connected to a first conductive portion 311. The zero-sequence current transformer 8 is sleeved on a plurality of second conductive portions 312, and the axial direction of the zero-sequence current transformer 8 is parallel to the third direction. The first direction, the second direction, and the third direction are arranged orthogonally to each other. Specifically, the axial direction of the zero-sequence current transformer 8 is parallel to the third direction, and the axial direction of the current transformer 7 is parallel to the second direction. This arrangement is equivalent to the axes of the zero-sequence current transformer 8 and the current transformer 7 being perpendicular. This arrangement can further compact the internal structure of the circuit breaker and further reduce the structural volume of the circuit breaker while ensuring reliable performance.

[0065] Optionally, the second conductive part 312 is configured as a hollow conductive metal tube.

[0066] Optionally, the second conductive part 312 is configured as a metal tube or rod.

[0067] Furthermore, a third conductive part 313 is connected between the first conductive part 311 and the second conductive part 312, and the zero-sequence current transformer 8 is supported on multiple third conductive parts 313. Specifically, the extension direction of the third conductive part 313 is located on the plane formed by the first direction and the second direction. The zero-sequence current transformer 8 is simultaneously supported on multiple third conductive parts 313, and the third conductive parts 313 can provide reliable support space for the zero-sequence current transformer 8.

[0068] Specifically, the third conductive part 313 has a conductive connecting plate at one end facing the first conductive part 311. The conductive connecting plate has a mounting hole, and a connector can be fixedly connected to the first conductive part 311 through the mounting hole, thereby realizing the fixation between the first conductive part 311 and the conductive connecting plate.

[0069] Optionally, the connector is a screw, which passes through the mounting hole and is threaded to the first conductive part 311. The structure is simple and the connection is reliable and secure.

[0070] In this embodiment, the end of the second conductive part 312 facing away from the first conductive part 311 is connected to a conductive connection terminal 314 extending out of the housing 1. The conductive connection terminal 314 is provided for connection and electrical conduction with the power supply side.

[0071] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A circuit breaker, characterized in that, It includes a housing (1) and a traction rod (4), an arc-extinguishing chamber (5), and a tripping drive (6) disposed within the housing (1); wherein, The tripping drive (6) includes a movable plug (61) and a drive rod (62). The arc-extinguishing chamber (5) has an air hole. The first end of the drive rod (62) is connected to the movable plug (61), and the second end of the drive rod (62) is correspondingly arranged with the tripping part (41) of the traction rod (4). The gas generated in the arc-extinguishing chamber (5) is discharged through the air hole to push the movable plug (61) to move. The movable plug (61) is configured to drive the drive rod (62) to move and press down the release part (41) to drive the traction rod (4) to release.

2. The circuit breaker according to claim 1, characterized in that, The tripping drive (6) also includes an elastic element (63), the first end of which is connected to the housing (1), and the second end of which is connected to the movable plug (61). The elastic element (63) is used to drive the movable plug (61) to reset.

3. The circuit breaker according to claim 2, characterized in that, The elastic element (63) is configured as a spring.

4. The circuit breaker according to claim 1, characterized in that, The movable plug (61) has an insertion hole (611), and the first end of the drive rod (62) is fixedly inserted into the insertion hole (611).

5. The circuit breaker according to claim 1, characterized in that, The housing (1) has a groove (101), the movable plug (61) is located in the groove (101), and the air hole (51) is connected to the groove (101). The gas generated in the arc-extinguishing chamber (5) is discharged through the air hole (51) and pushes the movable plug (61) to slide relative to the groove (101), so that the drive rod (62) moves and presses down the tripping part (41).

6. The circuit breaker according to claim 1, characterized in that, The movable plug (61) is hinged to the housing (1). The gas generated in the arc-extinguishing chamber (5) is discharged through the air hole (51), which pushes the movable plug (61) to swing upward on the side away from the tripping part (41), and causes the movable plug (61) to swing downward on the side facing the tripping part (41), so that the drive rod (62) presses down on the tripping part (41).

7. The circuit breaker according to claim 1, characterized in that, It also includes a second electrical connector (3) and a current transformer (7). The second electrical connector (3) includes a plurality of conductive elements (31). The plurality of conductive elements (31) are spaced apart along a first direction. Each conductive element (31) includes a first conductive portion (311) extending along a second direction. The current transformer (7) is provided with a plurality of current transformers and corresponds one-to-one with the first conductive portion (311). The current transformer (7) is sleeved on the first conductive portion (311) of the corresponding conductive element (31), and the current transformer (7) is axially parallel to the second direction. The first direction is perpendicular to the second direction.

8. The circuit breaker according to claim 7, characterized in that, It also includes a zero-sequence current transformer (8), wherein the conductive element (31) includes a second conductive part (312) extending along a third direction, the second conductive part (312) is connected to the first conductive part (311), the zero-sequence current transformer (8) is sleeved on a plurality of second conductive parts (312), and the axial direction of the zero-sequence current transformer (8) is parallel to the third direction; The first direction, the second direction, and the third direction are set orthogonally to each other.

9. The circuit breaker according to claim 8, characterized in that, A third conductive part (313) is connected between the first conductive part (311) and the second conductive part (312), and the zero-sequence current transformer (8) is supported on a plurality of the third conductive parts (313).

10. The circuit breaker according to claim 8, characterized in that, The second conductive part (312) has a conductive connection terminal (314) extending out of the housing (1) at one end facing away from the first conductive part (311).

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