breaker

Abstract

The present invention discloses a circuit breaker, which relates to the field of electrical equipment technology. The circuit breaker includes a housing and a terminal assembly, a switch assembly, and a current detection device arranged in an accommodating cavity of the housing. The terminal assembly includes a first terminal, a second terminal, a first conductive member, and a second conductive member. The switch assembly includes a movable contact and a static contact. The first terminal is electrically connected to the movable contact via the first conductive member, and the second terminal is electrically connected to the static contact via the second conductive member. The movable contact and the static contact are used to control the on-off of a circuit between the first terminal and the second terminal. The current detection device includes a shielding member and a magnetic sensor. The shielding member has a shielding space. The second conductive member is inserted into the shielding space. The magnetic sensor is arranged in the shielding space to detect the intensity of the magnetic field generated by the current in the second conductive member, so as to detect the magnitude of the current flowing through the second conductive member. The use of the magnetic sensor and the shielding member is conducive to the miniaturization of the circuit breaker.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and in particular to a circuit breaker. Background Art

[0002] In power protection devices such as low-voltage circuit breakers and intelligent circuit breakers, current detection is a key technical step in achieving core functions such as overload protection and short-circuit protection. Currently, the industry generally uses traditional electromagnetic current transformers as detection elements, which acquire current signals through the coupling of the core's magnetic circuit and the induction principle of the secondary winding. However, with the trend towards intelligent and miniaturized power systems, the inherent shortcomings of traditional current transformers are becoming increasingly prominent.

[0003] First, in order to achieve precise current conversion characteristics, the transformer must be equipped with a laminated silicon steel core and multiple turns of copper windings, which significantly increases its size and weight, making it difficult to achieve a reasonable layout inside the compact circuit breaker housing. Secondly, the high magnetic permeability materials and precision winding processes make the manufacturing cost remain high, especially in three-phase systems that require multiple sets of transformers to work together. The combined effect of material costs and manual assembly costs is obvious. In addition, when installing traditional transformers, it is necessary to strictly ensure that the primary conductive part passes through the center position of the core window, which places stringent requirements on the structural design of the circuit breaker. During the assembly process, the eccentricity of the conductive part often leads to increased measurement errors, requiring additional positioning tooling and correction processes, which seriously affects production efficiency. Summary of the Invention

[0004] The main purpose of the present invention is to provide a circuit breaker, aiming to solve the problem that the current transformer used in the existing circuit breaker results in a large volume and difficult to control cost.

[0005] To achieve the above-mentioned objectives, the circuit breaker proposed in the present invention includes a housing and a terminal assembly, a switch assembly and a current detection device arranged in the housing, wherein the terminal assembly includes a first terminal, a second terminal, a first conductive member and a second conductive member, and the switch assembly includes a moving contact and a static contact, the first terminal is electrically connected to the moving contact via the first conductive member, and the second terminal is electrically connected to the static contact via the second conductive member, and the moving contact and the static contact are used to control the on-off of the circuit between the first terminal and the second terminal; the current detection device includes a shielding member and a magnetic sensor, the shielding member has a shielding space, the second conductive member is inserted into the shielding space, and the magnetic sensor is arranged in the shielding space to detect the magnetic field strength generated by the current in the second conductive member, so as to detect the magnitude of the current flowing through the second conductive member.

[0006] In one embodiment, the shielding member has a first shielding portion and a second shielding portion arranged opposite to each other and a third shielding portion connecting the first shielding portion and the second shielding portion. The first shielding portion, the third shielding portion and the second shielding portion are sequentially connected and enclosed to form the shielding space with an opening on one side.

[0007] In one embodiment, the second conductive member extends along a first direction, the first shielding portion and the second shielding portion are arranged on opposite sides of the second conductive member along a second direction, the second conductive member passes through the shielding space, and the magnetic sensor is arranged on a side of the second conductive member away from the third shielding portion along a third direction.

[0008] In one embodiment, the current detection device also includes a mounting seat, on which a limiting groove and a mounting groove are spaced apart, the second conductive member is at least partially embedded in the limiting groove, the magnetic sensor is arranged in the mounting groove, and the shielding member is arranged on the mounting seat so that the limiting groove and the mounting groove are located in the shielding space.

[0009] In one embodiment, the circuit breaker further includes a main control board disposed in the housing and a first flexible circuit board connected to the main control board, wherein the first flexible circuit board at least partially extends into the mounting slot and is electrically connected to the magnetic sensor.

[0010] In one embodiment, the main control board is arranged on a side of the mounting base away from the limit groove, the current detection device also includes a support plate, a groove is provided on the side of the mounting base facing the main control board, the support plate is provided on the bottom wall of the groove and is spaced relative to the main control board, the first flexible circuit board is attached to the support plate, and electronic components are provided between the main control board and the first flexible circuit board.

[0011] In one embodiment, the circuit breaker further includes a second flexible circuit board, one end of the second flexible circuit board is electrically connected to the main control board, and the other end of the second flexible circuit board is electrically connected to the first terminal. The second flexible circuit board is provided with a temperature sensor and a voltage detector for respectively detecting the temperature and voltage of the first terminal.

[0012] In one embodiment, the switch assembly further includes an operating mechanism connected to the movable contact, the operating mechanism being used to drive the movable contact to move, and the second flexible circuit board is further provided with a position indicator connected to the operating mechanism, the position indicator being used to detect position information of the operating mechanism;

[0013] And / or, a signal light is further provided on the second flexible circuit board;

[0014] And / or, the second flexible circuit board is further provided with a button.

[0015] In one embodiment, the circuit breaker further includes an arc extinguishing device disposed in the shell, the current detection device is disposed between the second terminal and the arc extinguishing device, the current detection device and the inner wall of the shell are enclosed to form an exhaust channel, one end of the exhaust channel is arranged toward the arc extinguishing device, and the other end of the exhaust channel is connected to the outside of the shell.

[0016] In one embodiment, the housing is provided with a first opening and a second opening corresponding to the first terminal and the second terminal, respectively, and the exhaust passage is connected to the second opening;

[0017] And / or, an exhaust port is further provided on the housing corresponding to the arc extinguishing device.

[0018] The technical solution of the present invention reduces the size of a circuit breaker by replacing the current transformer with a magnetic sensor. Specifically, the circuit breaker includes a housing, a terminal assembly disposed within a housing cavity of the housing, a switch assembly, and a current detection device. The terminal assembly includes a first terminal, a second terminal, a first conductive member, and a second conductive member. The switch assembly includes a movable contact and a stationary contact. The first terminal is electrically connected to the movable contact via the first conductive member, and the second terminal is electrically connected to the stationary contact via the second conductive member. The movable contact and the stationary contact are used to control the on / off state of the circuit between the first terminal and the second terminal. The current detection device includes a shielding member and a magnetic sensor. The shielding member has a shielding space. The second conductive member is disposed within the shielding space. The magnetic sensor is disposed within the shielding space and is used to detect the strength of the magnetic field generated by the current in the second conductive member, thereby detecting the magnitude of the current flowing through the second conductive member. Replacing the traditional iron core and coil with the magnetic sensor and shielding member can significantly reduce the size and weight of the circuit breaker, facilitating miniaturization of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of an embodiment of a circuit breaker provided by the present invention;

[0021] Figure 2 A schematic diagram of the internal structure of a circuit breaker according to an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the disassembled structure of an embodiment of a circuit breaker provided by the present invention;

[0023] Figure 4 A schematic diagram of the disassembled structure of a current detection device in an embodiment of a circuit breaker provided by the present invention;

[0024] Figure 5 An assembly diagram of a current detection device in an embodiment of a circuit breaker provided by the present invention;

[0025] Figure 6 for Figure 2 Cross-sectional view in the AA direction;

[0026] Figure 7 for Figure 6 A magnified image of the position indicated by the arrow in middle B;

[0027] Figure 8 A schematic diagram of another internal structure of an embodiment of a circuit breaker provided by the present invention;

[0028] Figure 9 A schematic diagram of another split structure of an embodiment of a circuit breaker provided by the present invention;

[0029] Figure 10 This is a schematic diagram of the coordination structure between the operating mechanism and the second flexible circuit board in an embodiment of the circuit breaker provided by the present invention.

[0030] Description of Figure Numbers:

[0031] 100. Circuit breaker; 1. Housing; 1a. Accommodating chamber; 1b. First opening; 1c. Second opening; 1d. Exhaust port; 11. Push button; 2. Terminal block assembly; 21. First terminal; 22. Second terminal; 23. First conductive member; 24. Second conductive member; 25. Terminal block; 3. Arc extinguishing device; 31. Arc extinguishing hood; 31a. Through hole; 32. Arc extinguishing grid; 4. Current detection device; 4a. Exhaust channel; 41. Mounting seat; 41a. Limiting groove; 41b. Mounting groove; 41c. Guide groove; 4 1d, groove; 411, guide block; 42, shielding member; 42a, shielding space; 421, first shielding portion; 422, second shielding portion; 423, third shielding portion; 43, magnetic sensor; 44, support plate; 5, switch assembly; 51, moving contact; 52, static contact; 53, operating mechanism; 531, display area; 6, main control board; 61, first flexible circuit board; 62, second flexible circuit board; 621, position indicator; 622, signal light; 623, button; 63, electronic component; 7, tripping mechanism.

[0032] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] The present invention provides a circuit breaker 100 .

[0037] See also Figures 1 to 4 In one embodiment of the present invention, the circuit breaker 100 includes a housing 1 and a terminal assembly 2, a switch assembly 5, and a current detection device 4 disposed within an accommodating cavity 1a of the housing 1. The terminal assembly 2 includes a first terminal 21, a second terminal 22, a first conductive member 23, and a second conductive member 24. The switch assembly 5 includes a movable contact 51 and a stationary contact 52. The first terminal 21 is electrically connected to the movable contact 51 via the first conductive member 23, and the second terminal 22 is electrically connected to the stationary contact 52 via the second conductive member 24. The movable contact 51 is movably disposed within the accommodating cavity 1a. When the movable contact 51 abuts the stationary contact 52, the circuit between the first terminal 21 and the second terminal 22 is connected. When the movable contact 51 and the stationary contact 52 are separated, the circuit between the first terminal 21 and the second terminal 22 is disconnected.

[0038] The current detection device 4 includes a shielding member 42 and a magnetic sensor 43. The shielding member 42 has a shielding space 42a through which the second conductive member 24 is disposed. The magnetic sensor 43 is disposed within the shielding space 42a to detect the magnetic field strength generated by the current in the second conductive member 24. The magnitude of the current flowing through the second conductive member 24 can be measured based on the magnetic field strength. Traditional circuit breakers typically use current transformers to detect current. However, current transformers, which include an iron core and coil, are bulky and heavy, limiting their use in certain space-constrained environments. This solution replaces the traditional iron core and coil with a magnetic sensor 43 and a shielding member 42, significantly reducing the size and weight of the circuit breaker 100 and facilitating miniaturization and cost control.

[0039] It should be noted that the shielding space 42a of the shielding member 42 can be spherical, cylindrical, or other shapes. These symmetrical structures can provide uniform magnetic field shielding. However, considering the installation space limitations of actual products, the shielding space 42a is usually designed as a rectangular parallelepiped or cylindrical shape. Among the shielding spaces of different shapes mentioned above, the magnetic field shielding effect provided by the closed structure is better, which can reduce edge effects and magnetic leakage. However, considering the actual assembly of components, the shielding member 42 mostly adopts a non-closed structure, such as an L-shaped or U-shaped shielding member. Designers can optimize the magnetic field distribution through simulation software. Therefore, in different embodiments of the present invention, the specific structure of the shielding member 42 and the shape of the shielding space 42a are not limited, so as to ensure that the magnetic sensor 43 can accurately detect the intensity of the magnetic field generated by the current in the second conductive member 24.

[0040] In one embodiment, the shielding member 42 has a first shielding portion 421 and a second shielding portion 422 that are relatively arranged, and a third shielding portion 423 connecting the first shielding portion 421 and the second shielding portion 422. The first shielding portion 421, the third shielding portion 423 and the second shielding portion 422 are connected in sequence and enclosed to form a shielding space 42a with an opening on one side.

[0041] like Figure 4 and Figure 5 As shown, in one embodiment of the present invention, the shielding member 42 has an overall U-shaped structure and has a first shielding portion 421 and a second shielding portion 422 that are relatively arranged, and a third shielding portion 423 connecting the first shielding portion 421 and the second shielding portion 422. The shielding space 42a formed by the first shielding portion 421, the second shielding portion 422 and the third shielding portion 423 is open to one side, and the second conductive member 24 and the magnetic sensor 43 can be installed into the shielding space 42a from the side opening of the shielding member 42, which is convenient for installation and does not require disconnecting the circuit or disassembling the equipment.

[0042] It should be noted that the first shielding portion 421, the second shielding portion 422, and the third shielding portion 423 can concentrate the magnetic field of the conductor being measured into the sensitive area of ​​the magnetic sensor 43, while simultaneously blocking external stray magnetic fields, thereby improving current measurement accuracy. Furthermore, within the compact circuit breaker 100, its U-shaped structure can bypass other components (such as the arc extinguishing chamber and terminal block), allowing for flexible placement of the magnetic sensor 43. This improves space utilization within the housing 1 and further reduces the size of the circuit breaker 100.

[0043] In one embodiment, the second conductive member 24 is extended along the first direction, the first shielding portion 421 and the second shielding portion 422 are arranged on opposite sides of the second conductive member 24 along the second direction, the second conductive member 24 is passed through the shielding space 42a and the magnetic sensor 43 is arranged on a side of the second conductive member 24 away from the third shielding portion 423 along the third direction.

[0044] like Figure 2 As shown, in one embodiment of the present invention, the circuit breaker 100 further includes an arc extinguishing device 3 provided in the housing 1, the first terminal 21, the arc extinguishing device 3, the current detection device 4 and the second terminal 22 are arranged along the first direction, and further reference is made to Figures 4 to 6 The second conductive member 24 extends along the first direction, the first shielding portion 421 and the second shielding portion 422 of the shielding member 42 are arranged on opposite sides of the second conductive member 24 along the second direction, the third shielding portion 423 is arranged on one side of the second conductive member 24 in the third direction, the second conductive member 24 passes through the shielding space 42a along the first direction, and the magnetic sensor 43 is arranged on a side of the second conductive member 24 in the third direction away from the third shielding portion 423.

[0045] When the second conductive member 24 is energized, a magnetic field is generated on the peripheral side. The first shielding portion 421 and the second shielding portion 422 have a corrective effect on the generated magnetic field, so that the magnetic field is arranged along the second direction within the shielding space 42a, and the direction of the magnetic field is single and uniform, which is beneficial to improving the accuracy of the magnetic sensor 43 in detecting the magnetic field strength generated by the current in the second conductive member 24.

[0046] In one embodiment, the current detection device 4 also includes a mounting base 41, on which a limiting groove 41a and a mounting groove 41b are spaced apart. The second conductive member 24 is at least partially embedded in the limiting groove 41a, the magnetic sensor 43 is disposed in the mounting groove 41b, and the shielding member 42 is disposed on the mounting base 41 so that the limiting groove 41a and the mounting groove 41b are located in the shielding space 42a.

[0047] like Figures 4 to 7As shown, in one embodiment of the invention, the current detection device 4 also includes a mounting base 41. Specifically, the mounting base 41 is provided with a limiting groove 41a and a mounting groove 41b in the third direction, and the notches of the limiting groove 41a and the mounting groove 41b are arranged in opposite directions in the second direction. Part of the second conductive member 24 is embedded in the limiting groove 41a, and the magnetic sensor 43 is installed in the mounting groove 41b. The mounting base 41 is used to limit the relative position of the magnetic sensor 43 and the second conductive member 24. The shielding member 42 has an open side inserted on the mounting base 41, so that the second conductive member 24 and the magnetic sensor 43 are arranged in the shielding space 42a.

[0048] It will be appreciated that the positioning slots 41a and 41b of the mounting base 41 secure the relative position of the second conductive member 24 and the magnetic sensor 43, ensuring that the magnetic sensor 43 is always in the optimal detection area and preventing signal fluctuations caused by conductor deviation. Once fixed in position, the shield 42 precisely covers the critical area between the magnetic sensor 43 and the second conductive member 24, reducing interference from external stray magnetic fields (such as adjacent phase lines and high-frequency noise). This fixed-position design allows for the use of standardized components, simplifies assembly on the production line, and reduces human error.

[0049] In one embodiment, the circuit breaker 100 further includes a main control board 6 disposed in the housing 1 and a first flexible circuit board 61 connected to the main control board 6 . The first flexible circuit board 61 at least partially extends into the mounting groove 41 b and is electrically connected to the magnetic sensor 43 .

[0050] like Figure 3 and 4 As shown, in one embodiment of the present invention, the circuit breaker 100 further includes a main control board 6 and a first flexible circuit board 61. Specifically, the main control board 6 is disposed in the housing 1 and is electrically connected to the first flexible circuit board 61. The first flexible circuit board 61 at least partially extends into the mounting groove 41b and is electrically connected to the magnetic sensor 43. The magnetic sensor 43 can send detection information about the magnetic field strength to the main control board 6 via the first flexible circuit board 61. The main control board 6 can calculate the current flowing through the second conductive member 24 based on the detection information.

[0051] As can be appreciated, since magnetic sensor 43 is located within shielded space 42a, the flexible printed circuit (FPC) can conform to the irregular interior space of circuit breaker 100, precisely positioning magnetic sensor 43 near second conductive member 24. This shortens the signal path and reduces parasitic inductance and noise interference. By precisely calculating the FPC's line width, spacing, and dielectric layer thickness, impedance-matched routing is achieved, reducing high-frequency signal reflections and improving the communication stability of the magnetic sensor 43's digital interface.

[0052] In one embodiment, the main control board 6 is arranged on a side of the mounting base 41 away from the limiting groove 41a, and the current detection device 4 also includes a support plate 44. A groove 41d is provided on the side of the mounting base 41 facing the main control board 6. The support plate 44 is provided on the bottom wall of the groove 41d and is spaced relative to the main control board 6. The first flexible circuit board 61 is attached to the support plate 44, and an electronic component 63 is provided between the main control board 6 and the first flexible circuit board 61.

[0053] like Figures 4 to 7 As shown, in one embodiment of the present invention, the main control board 6 is mounted on the side of the current detection device 4 near the inner wall of the housing 1. A recess 41d is formed on the side of the mounting base 41 facing the main control board 6. A mounting groove 41b is located within this recess 41d. A support plate 44 is provided on the bottom wall of recess 41d. A first flexible printed circuit board 61 is attached to the surface of the support plate 44 and extends along the inner wall of recess 41d into the mounting groove 41b for connection to the magnetic sensor 43. The first flexible printed circuit board 61 is connected to the main control board 6 via an electronic component 63 to limit the installation of the main control board 6. The support plate 44 supports the first flexible printed circuit board 61 and the main control board 6. The electronic component 63 disposed between the main control board 6 and the first flexible printed circuit board 61 allows for signal transmission and forms a combined structure for assembly, further reducing the number of assembly steps for the circuit breaker 100.

[0054] In one embodiment, the circuit breaker 100 further includes a second flexible circuit board 62, one end of which is electrically connected to the main control board 6, and the other end of the second flexible circuit board 62 is electrically connected to the first terminal 21. A temperature sensor and a voltage detector are provided on the second flexible circuit board 62 for respectively detecting the temperature and voltage of the first terminal 21.

[0055] like Figure 9 As shown, in one embodiment of the present invention, the circuit breaker 100 further includes a second flexible circuit board 62, on which a voltage detector (not shown) and a temperature sensor (not shown) are provided. The second flexible circuit board 62 is in an elongated strip shape, and one end of the second flexible circuit board 62 is electrically connected to the first terminal 21, and the other end of the second flexible circuit board 6 is electrically connected to the main control board 6. The second terminal 22 connected to the static contact 52 is typically connected to the power supply line (power end) and remains fixed and energized. The first terminal 21 connected to the moving contact 51 is typically connected to a load device (load end). To ensure electrical safety at the load end, the voltage detector is used to detect the voltage at the first terminal 21, and the temperature sensor is used to detect the temperature at the first terminal 21.

[0056] As can be seen from the above, using the second flexible circuit board 62 to connect the main control board 6 and the first terminal 21 can simplify the complex wiring structure inside the circuit breaker 100 and integrate multiple wirings into one flexible circuit board, which greatly facilitates installation and component production, reduces assembly difficulty and improves large-scale production efficiency.

[0057] Furthermore, the terminal assembly 2 also includes a terminal block 25 connected to the first terminal 21. A spring is provided on the side of the terminal block 25 facing the second flexible circuit board 62. The voltage detector and the temperature sensor can be electrically connected to the terminal block 25 through the springs respectively. It should be noted that the spring continuously applies pressure through elastic deformation, so that the terminal block 25 fits tightly with the contacts of the voltage detector or temperature sensor, reduces fluctuations in contact resistance, reduces poor contact caused by vibration, temperature changes or mechanical deformation, and avoids voltage measurement errors.

[0058] Furthermore, during operation of circuit breaker 100, terminal block 25 may expand or contract due to temperature rise (Joule heating) generated by current flow or changes in ambient temperature. The elasticity of the spring absorbs this deformation, preventing stress concentration or contact separation caused by a rigid connection. This maintains a long-term, stable electrical connection and extends the life of the device.

[0059] In one embodiment, the switch assembly 5 further includes an operating mechanism 53 connected to the movable contact 51, the operating mechanism 53 being used to drive the movable contact 51 to move. The second flexible circuit board 62 is further provided with a position indicator 621 connected to the operating mechanism 53, the position indicator 621 being used to detect position information of the operating mechanism 53.

[0060] And / or, a signal light 622 is further provided on the second flexible circuit board 62;

[0061] And / or, a button 623 is further provided on the second flexible circuit board 62 .

[0062] like Figure 9 As shown, in one embodiment of the present invention, the second flexible circuit board 62 is further provided with one or more of a position indicator 621, a signal light 622 and a button 623. Specifically, the switch assembly 5 also includes an operating mechanism 53, which includes a handle and a transmission assembly connected to the handle. The moving contact 51 is arranged on the transmission assembly. When the handle is rotated by an external force, the moving contact 51 can be driven by the transmission assembly to move toward or away from the static contact 52. The lever on the position indicator 621 is connected to the transmission assembly of the operating mechanism 53. When the handle is closed or opened, the transmission assembly moves and pushes the lever of the position indicator 621 to swing, and the main control board 6 can obtain the connection status of the moving contact 51 and the static contact 52.

[0063] Furthermore, a signal light 622 is provided on the second flexible printed circuit board 62 and electrically connected to the main control board 6. A light-transmitting area is provided on the housing 1 at the location corresponding to the signal light 622. This light-transmitting area can be a light-through hole provided on the housing 1, or the portion of the housing 1 corresponding to the signal light 622 can be made of a light-transmitting material. The signal light 622 is used to indicate the operating status of the circuit breaker 100 by displaying different colors to indicate whether the circuit breaker 100 is closed, open, or in a fault warning state, prompting the operator's attention. The position indicator 621 is electrically connected to the main control board 6, and the main control board 6 can display the status of the circuit breaker 100 through the signal light 622 based on the information from the position indicator 621.

[0064] Furthermore, the second flexible circuit board 62 is provided with a button 623, which is electrically connected to the main control board 6 and is primarily used for functions such as operation, reset, testing, overload protection, short-circuit protection, and address setting. The operator can control the button 623 by means of information transmitted by the signal light 622 to perform corresponding operations to achieve different functions. It can be understood that the use of the first and second flexible circuit boards 61 and 62 to replace the complex wiring in the original circuit breaker 100 further improves the internal space utilization of the housing 1, facilitates the control of the overall volume of the circuit breaker 100, and makes the circuit breaker 100 suitable for use in some space-constrained scenarios.

[0065] Further, such as Figure 9 and Figure 10 As shown, in one embodiment of the present invention, a button 11 is further provided on the housing 1, and the button 11 includes a pressing portion and a light-transmitting portion. Specifically, the pressing portion is cylindrical so as to pass through the light-transmitting hole of the housing 1 and abut against the button 623. A display area 531 is provided on the transmission assembly of the operating mechanism 53, and the display area 531 is divided into two color blocks of red and green. The light-transmitting portion of the button 11 extends along the inner wall of the housing 1 and is provided corresponding to the display area 531 and the signal light 622. The light-transmitting portion can display the color of the signal light 622, and can also display the red or green color information on the operating mechanism 53. Usually, red indicates that the circuit breaker 100 is in the open position, and green indicates that the circuit breaker 100 is in the closed position. The appearance of the red and green areas helps the user quickly judge the status of the circuit breaker 100 and avoid misoperation.

[0066] In one embodiment, the main body of the circuit breaker 100 also includes an arc extinguishing device 3 arranged in the shell 1, and the current detection device 4 is arranged between the second terminal 22 and the arc extinguishing device 3. The current detection device 4 and the inner wall of the shell 1 are enclosed to form an exhaust channel 4a, one end of the exhaust channel 4a is set toward the arc extinguishing device 3, and the other end of the exhaust channel 4a is connected to the outside of the shell 1.

[0067] like Figure 8As shown, in one embodiment of the present invention, the circuit breaker 100 further includes an arc extinguishing device 3, which includes an arc extinguishing cover 31 and an arc extinguishing grid 32 arranged on the arc extinguishing cover 31. The arc extinguishing cover 31 is open on one side facing the moving contact 51 and the static contact 52. For further reference, Figure 3 The moving contact 51 and the static contact 52 are arranged opposite to each other on the side of the arc extinguishing device 3 close to the first terminal 21. The first conductive member 23 partially extends to the bottom of the arc extinguishing cover 31. The end of the second conductive member 24 away from the second terminal 22 is arranged on the top of the arc extinguishing cover 31. The static contact 52 is arranged on the second conductive member 24. When power is on, the moving contact 51 abuts against the static contact 52. When the moving contact 51 and the static contact 52 perform the disconnection action and separate, an arc is generated. The arc extinguishing device 3 is used to guide and extinguish the arc. Figure 6 The mounting base 41 of the current detection device 4 is away from the main control board 6 and the inner wall of the shell 1 to form an exhaust channel 4a, which is used to discharge the plasma generated by the arc exciting the air out of the shell 1 to improve the plasma exhaust efficiency.

[0068] It should be noted that after replacing the conventional current transformer with the magnetic sensor 43, the internal space required for mounting the current detection device 4 in the housing 1 is smaller. A guide groove 41c is provided on the back of the mounting base 41, away from the magnetic sensor 43. When the mounting base 41 abuts the inner wall of the housing 1, an exhaust channel 4a is formed at the location of the guide groove 41c. Furthermore, guide blocks 411 can be provided in the guide groove 41c. The staggered arrangement of the guide blocks 411 causes the exhaust channel 4a to curve and extend, helping to change the direction of the plasma flow and increase the contact time between the plasma and the air, thereby effectively cooling the plasma and allowing it to be discharged more smoothly and controllably from the exterior of the housing 1, thereby preventing damage to the internal components of the circuit breaker 100 caused by the plasma.

[0069] In one embodiment, the housing 1 is provided with a first opening 1b and a second opening 1c corresponding to the first terminal 21 and the second terminal 22, respectively, and the exhaust passage 4a is connected to the second opening 1c.

[0070] And / or, an exhaust port 1d is further provided on the housing 1 corresponding to the arc extinguishing device 3.

[0071] like Figure 8As shown, in one embodiment of the present invention, a first opening 1b and a second opening 1c are provided on opposite sides of the shell 1 along the first direction, and the first terminal 21, the arc extinguishing device 3, the current detection device 4 and the second terminal 22 are arranged in sequence in the accommodating cavity 1a, so that the first opening 1b, the first terminal 21, the arc extinguishing device 3, the current detection device 4, the second terminal 22 and the second opening 1c are arranged along the first direction, the first direction is the width direction of the shell 1, the moving contact 51 and the static contact 52 are arranged on the side of the arc extinguishing device 3 close to the first terminal 21, and the exhaust channel 4a extends along the first direction, and the plasma generated by the arc can be discharged from the shell 1 along the first direction from the exhaust channel 4a and the second opening 1c.

[0072] It can be understood that arranging multiple components along the first direction in the housing 1 can effectively save space and reduce the vertical height occupied by the equipment. The horizontal arrangement helps air circulation, improves heat dissipation efficiency, avoids local overheating or accumulation of ionized gas, ensures that the circuit breaker 100 maintains a stable temperature during operation, and extends the service life of the equipment.

[0073] Furthermore, an exhaust port 1d is provided on the shell 1. Specifically, the exhaust port 1d is connected to the accommodating cavity 1a and is spaced apart from the first opening 1b and the second opening 1c. A plurality of through holes 31a are provided on the side wall of the arc extinguishing cover 31 near the current detection device 4. The plurality of through holes 31a of the arc extinguishing cover 31 are respectively connected to the exhaust channel 4a and the exhaust port 1d, so that the plasma generated by the arc extinguishing device 3 can be discharged from the shell 1 from the exhaust channel 4a and the second opening 1c, and can also be discharged from the shell 1 from the exhaust port 1d, thereby further improving the plasma discharge efficiency and improving the safety of the equipment.

[0074] In one embodiment of the present invention, the circuit breaker 100 further includes a tripping mechanism 7, which is disposed above the arc extinguishing device 3. The second conductive member 24 is partially wound around the tripping mechanism 7. When the current within the second conductive member 24 reaches a preset value, the magnetic field generated by the current within the second conductive member 24 drives the tripping mechanism 7 to push the operating mechanism 53 to move, thereby separating the moving contact 51 and the static contact 52. It should be noted that the portion of the second conductive member 24 disposed on the mounting base and the portion wound around the tripping mechanism 7 can be an integral structure or a separate structure connected by welding, without specific limitation.

[0075] Furthermore, in another embodiment of the present invention, the circuit breaker 100 further includes a drive mechanism (not shown) disposed within the housing. This drive mechanism is mounted on the trip mechanism 7 and electrically connected to the main control board 6. When the current detection device 4 detects that the current in the second conductive member 24 reaches a preset value, the main control board 6 controls the drive mechanism to activate the trip mechanism 7, causing the trip mechanism 7 to push the operating mechanism 53 to separate the movable contact 51 and the stationary contact 52, thereby ensuring safe operation of the circuit breaker 100. Of course, the current detection device 4 can also be used solely for current detection. Whether or not to include a drive mechanism is a matter of practical choice and is not specifically limited herein.

[0076] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A circuit breaker, characterized in that: It includes a shell and a terminal assembly, a switch assembly, a current detection device and an arc extinguishing device arranged in the shell, the terminal assembly includes a first terminal, a second terminal, a first conductive member and a second conductive member, the switch assembly includes a moving contact and a static contact, the first terminal is electrically connected to the moving contact through the first conductive member, the second terminal is electrically connected to the static contact through the second conductive member, the moving contact and the static contact are used to control the on and off of the circuit between the first terminal and the second terminal; the current detection device includes a mounting base and a shielding member and a magnetic sensor arranged on the mounting base, the shielding member has a shielding space, the second conductive member is passed through the shielding space, and the magnetic sensor is arranged in the shielding space to detect the magnetic field strength generated by the current in the second conductive member, so as to detect the magnitude of the current flowing through the second conductive member; The shell is provided with a first opening and a second opening corresponding to the first terminal and the second terminal respectively. The first opening, the first terminal, the arc extinguishing device, the current detection device, the second terminal and the second opening are arranged in sequence along the first direction on the shell. The arc extinguishing device is provided with a plurality of through holes on the side wall close to the current detection device. The mounting seat and the inner wall of the shell are combined to form an exhaust channel. The shell is provided with an exhaust port spaced apart from the first opening and the second opening. The plurality of through holes are respectively connected to the exhaust port and one end of the exhaust channel, and the exhaust channel is connected to the second opening at one end away from the arc extinguishing device.

2. The circuit breaker according to claim 1, wherein: The shielding member comprises a first shielding portion and a second shielding portion which are arranged opposite to each other, and a third shielding portion which connects the first shielding portion and the second shielding portion. The first shielding portion, the third shielding portion and the second shielding portion are sequentially connected and enclosed to form the shielding space with an opening on one side.

3. The circuit breaker according to claim 2, wherein: The second conductive member extends along the first direction, the first shielding portion and the second shielding portion are arranged on opposite sides of the second conductive member along the second direction, the second conductive member passes through the shielding space, and the magnetic sensor is arranged on a side of the second conductive member away from the third shielding portion along the third direction.

4. The circuit breaker according to any one of claims 1 to 3, characterized in that: The mounting seat is provided with a limiting groove and a mounting groove at intervals, the second conductive member is at least partially embedded in the limiting groove, the magnetic sensor is arranged in the mounting groove, and the shielding member is arranged on the mounting seat so that the limiting groove and the mounting groove are located in the shielding space.

5. The circuit breaker according to claim 4, wherein: The circuit breaker further includes a main control board disposed in the housing and a first flexible circuit board connected to the main control board. The first flexible circuit board at least partially extends into the mounting slot and is electrically connected to the magnetic sensor.

6. The circuit breaker according to claim 5, wherein: The main control board is arranged on a side of the mounting base away from the limit groove. The current detection device also includes a support plate. A groove is provided on the side of the mounting base facing the main control board. The support plate is provided on the bottom wall of the groove and is spaced relative to the main control board. The first flexible circuit board is attached to the support plate, and electronic components are provided between the main control board and the first flexible circuit board.

7. The circuit breaker according to claim 5, wherein: The circuit breaker also includes a second flexible circuit board, one end of which is electrically connected to the main control board, and the other end of which is electrically connected to the first terminal. The second flexible circuit board is provided with a temperature sensor and a voltage detector for respectively detecting the temperature and voltage of the first terminal.

8. The circuit breaker according to claim 7, wherein: The switch assembly further includes an operating mechanism connected to the movable contact, the operating mechanism being used to drive the movable contact to move, and the second flexible circuit board is further provided with a position indicator connected to the operating mechanism, the position indicator being used to detect position information of the operating mechanism; And / or, a signal light is further provided on the second flexible circuit board; And / or, the second flexible circuit board is further provided with a button.

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