Circuit breaker

Abstract

The invention discloses a circuit breaker, and relates to the technical field of electrical appliances, the circuit breaker comprises a shell, and a wiring terminal assembly, a switch assembly and a current detection device which are arranged in an accommodating cavity of the shell, the wiring terminal assembly comprises a first wiring terminal, a second wiring terminal, a first conductive part and a second conductive part, the switch assembly comprises a moving contact and a static contact, the first wiring terminal is electrically connected with the moving contact through a first conductive part, the second wiring terminal is electrically connected with the static contact through a second conductive part, and the moving contact and the static contact are used for controlling on-off of a loop between the first wiring terminal and the second wiring terminal; the current detection device comprises a shielding part and a magnetic sensor, the shielding part is provided with a shielding space, the second conductive part penetrates through the shielding space, and the magnetic sensor is arranged in the shielding space and used for detecting the magnetic field intensity generated by current in the second conductive part so as to detect the magnitude of the current flowing through the second conductive part. And miniaturization of the circuit breaker is facilitated by adopting the magnetic sensor and the shielding piece.

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 link to achieve core functions such as overload protection and short-circuit protection. At present, the industry generally uses traditional electromagnetic current transformers as detection elements, which realize current signal acquisition through the iron core magnetic circuit coupling and secondary winding induction principle. However, with the development trend of intelligent and miniaturized power systems, the inherent defects of traditional current transformers are becoming increasingly prominent.

[0003] First, in order to achieve accurate current conversion characteristics, the transformer must be equipped with a silicon steel laminated core and a multi-turn copper winding, which significantly increases its volume and weight, making it difficult to achieve a reasonable layout inside the compact circuit breaker housing. Secondly, high magnetic permeability materials and precision winding processes make the manufacturing cost 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 parts pass through the center position of the core window, which puts stringent requirements on the structural design of the circuit breaker. During the assembly process, the eccentricity of the conductive parts often increases the measurement error, and additional positioning tooling and correction processes are required, 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 leads to large volume and difficult to control cost.

[0005] To achieve the above-mentioned purpose, the circuit breaker proposed in the present invention includes a shell and a terminal assembly, a switch assembly and a current detection 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 shielding member and a magnetic sensor, the shielding member has a shielding space, the second conductive member is penetrated 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.

[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, and 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 is extended 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 limit groove and a mounting groove are spaced apart, the second conductive member is at least partially embedded in the limit groove, the magnetic sensor is disposed in the mounting groove, and the shielding member is disposed on the mounting seat so that the limit 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 groove 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, the other end of the second flexible circuit board is electrically connected to the first terminal, and a temperature sensor and a voltage detector are provided on the second flexible circuit board 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 moving contact, the operating mechanism is used to drive the moving contact to move, and the second flexible circuit board is further provided with a position indicator connected to the operating mechanism, the position indicator is used to detect position information of the operating mechanism; And / or, a signal light is also provided on the second flexible circuit board; And / or, the second flexible circuit board is also provided with a button.

[0013] In one embodiment, the circuit breaker also includes an arc extinguishing device arranged in the shell, the current detection device is arranged 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.

[0014] In one embodiment, the housing is provided with a first opening and a second opening corresponding to the first wiring terminal and the second wiring terminal, respectively, and the exhaust passage is connected to the second opening; And / or, an exhaust port is further provided on the shell corresponding to the arc extinguishing device.

[0015] The technical solution of the present invention adopts the method of replacing the current transformer with a magnetic sensor detection to reduce the volume of the circuit breaker. Specifically, the circuit breaker includes a housing and a terminal assembly, a switch assembly and a current detection device arranged in a housing 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 moving contact and a static contact. The first terminal is electrically connected to the moving contact through the first conductive member, and 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-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 arranged in the shielding space. 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 current flowing through the second conductive member. The use of magnetic sensors and shielding members to replace traditional iron cores and coils can greatly reduce the volume and weight of the circuit breaker, which is conducive to the miniaturization of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0017] Figure 1 A schematic structural diagram of an embodiment of a circuit breaker provided by the present invention; Figure 2 A schematic diagram of the internal structure of a circuit breaker according to an embodiment of the present invention; Figure 3 A schematic diagram of the disassembly structure of a circuit breaker according to an embodiment of the present invention; Figure 4A schematic diagram of the disassembled structure of a current detection device in an embodiment of a circuit breaker provided by the present invention; Figure 5 An assembly diagram of a current detection device in an embodiment of a circuit breaker provided by the present invention; Figure 6 for Figure 2 Sectional view in the AA direction; Figure 7 for Figure 6 The enlarged image of the position indicated by the arrow in B; Figure 8 Another schematic diagram of the internal structure of a circuit breaker in an embodiment of the present invention; Fig. 9 A schematic diagram of another split structure of an embodiment of a circuit breaker provided by the present invention; Fig.10 This is a schematic diagram of the matching structure between the operating mechanism and the second flexible circuit board in an embodiment of a circuit breaker provided by the present invention.

[0018] Description of Figure Numbers: 100. Circuit breaker; 1. Housing; 1a. Accommodating chamber; 1b. First opening; 1c. Second opening; 1d. Exhaust port; 11. Button; 2. Terminal 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 cover; 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 part; 422, second shielding part; 423, third shielding part; 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, release mechanism.

[0019] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0021] 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 components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0022] 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 used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the 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 contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] The present invention provides a circuit breaker 100 .

[0024] 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 arranged in 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 moving contact 51 and a stationary contact 52. The first terminal 21 is electrically connected to the moving contact 51 through the first conductive member 23, and the second terminal 22 is electrically connected to the stationary contact 52 through the second conductive member 24. The moving contact 51 is movably arranged in the accommodating cavity 1a. When the moving contact 51 abuts against the stationary contact 52, the circuit between the first terminal 21 and the second terminal 22 is connected; when the moving contact 51 is separated from the stationary contact 52, the circuit between the first terminal 21 and the second terminal 22 is disconnected.

[0025] The current detection device 4 includes a shielding member 42 and a magnetic sensor 43. The shielding member 42 has a shielding space 42a. The second conductive member 24 is arranged through the shielding space 42a. The magnetic sensor 43 is arranged in 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 by the magnetic field strength. Traditional circuit breakers usually use current transformers to detect current, and the current transformer structure includes an iron core and a coil, which is large in size and heavy in weight, and is limited in use in certain scenarios where space is insufficient. This solution uses a magnetic sensor 43 and a shielding member 42 to replace the traditional iron core and coil, which can greatly reduce the volume and weight of the circuit breaker 100, which is conducive to the miniaturization and cost control of the circuit breaker 100.

[0026] It should be noted that the shielding space 42a of the shielding member 42 can be spherical, cylindrical, and other shapes. These symmetrical structures can provide uniform magnetic field shielding, but considering the installation space limitations of the actual product, the shielding space 42a is usually designed in a rectangular or cylindrical shape. In the above-mentioned shielding spaces of different shapes, the magnetic field shielding effect provided by the closed structure is better, which can reduce the edge effect and magnetic leakage. However, considering the actual assembly of parts, the shielding member 42 mostly adopts a non-closed structure, such as an L-shaped or U-shaped shielding member, and the designer 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 strength of the magnetic field generated by the current in the second conductive member 24.

[0027] 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 sequentially connected and enclosed to form a shielding space 42a with an opening on one side.

[0028] like Figure 4 and Figure 5 As shown, in one embodiment of the present invention, the shielding member 42 is 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 without disconnecting the circuit or disassembling the equipment.

[0029] It should be noted that the first shielding part 421, the second shielding part 422 and the third shielding part 423 can concentrate the magnetic field of the conductor being measured to the sensitive area of ​​the magnetic sensor 43, while blocking the external stray magnetic field, thereby improving the current measurement accuracy. In addition, inside the compact circuit breaker 100, its U-shaped structure can bypass other components (such as arc extinguishing chamber, terminal block), flexibly arrange the position of the magnetic sensor 43, improve the space utilization inside the housing 1, and further reduce the volume of the circuit breaker 100.

[0030] 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.

[0031] like Figure 2 As shown, in one embodiment of the present invention, the circuit breaker 100 further includes an arc extinguishing device 3 disposed in the housing 1, and 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. 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 the side of the second conductive member 24 in the third direction away from the third shielding portion 423.

[0032] 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 in 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.

[0033] In one embodiment, the current detection device 4 also includes a mounting base 41, on which a limit groove 41a and a mounting groove 41b are spaced apart, the second conductive member 24 is at least partially embedded in the limit 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 limit groove 41a and the mounting groove 41b are located in the shielding space 42a.

[0034] like Figures 4 to 7As shown, in one embodiment of the invention, the current detection device 4 also includes a mounting seat 41. Specifically, the mounting seat 41 is provided with a limit groove 41a and a mounting groove 41b in the third direction, and the notches of the limit 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 limit groove 41a, and the magnetic sensor 43 is installed in the mounting groove 41b. The mounting seat 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 seat 41, so that the second conductive member 24 and the magnetic sensor 43 are arranged in the shielding space 42a.

[0035] It is understandable that by setting the limiting groove 41a and the mounting groove 41b of the mounting seat 41, the relative position of the second conductive member 24 and the magnetic sensor 43 is fixed, ensuring that the magnetic sensor 43 is always in the optimal detection area, avoiding signal fluctuations caused by conductor deviation. After the position is fixed, the shielding member 42 can accurately cover the key area of ​​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). The fixed position design can use standardized components to simplify the assembly process of the production line and reduce human errors.

[0036] 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 .

[0037] like Figure 3 and 4 As shown, in one embodiment of the present invention, the circuit breaker 100 also includes a main control board 6 and a first flexible circuit board 61. Specifically, the main control board 6 is arranged in the shell 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 through the first flexible circuit board 61, and the main control board 6 can calculate the current flowing through the second conductive member 24 according to the detection information.

[0038] It is understandable that, since the magnetic sensor 43 is located in the shielding space 42a, the flexible printed circuit (FPC) can fit the irregular space inside the circuit breaker 100, and the magnetic sensor 43 is precisely arranged near the second conductive member 24, shortening the signal path, reducing parasitic inductance and noise interference. By accurately calculating the line width, spacing and dielectric layer thickness of the FPC, matching impedance wiring can be achieved, high-frequency signal reflection can be reduced, and the communication stability of the digital interface of the magnetic sensor 43 can be improved.

[0039] 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 arranged 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.

[0040] like Figures 4 to 7 As shown, in one embodiment of the present invention, the main control board 6 is arranged on a side of the current detection device 4 close to the inner wall of the housing 1, a groove 41d is provided on the side of the mounting seat 41 facing the main control board 6, a mounting groove 41b is arranged in the groove 41d, a support plate 44 is provided on the bottom wall of the groove 41d, a first flexible circuit board 61 is attached to the surface of the support plate 44 and extends along the inner wall of the groove 41d to the mounting groove 41b to connect the magnetic sensor 43, and the first flexible circuit board 61 is connected to the main control board 6 through an electronic component 63 to limit the installation of the main control board 6. The support plate 44 is used to support the first flexible circuit board 61 and the main control board 6, and the electronic component 63 is arranged between the main control board 6 and the first flexible circuit board 61, which can transmit signals and form a combined structure for assembly, further reducing the assembly steps of the circuit breaker 100.

[0041] In one embodiment, the circuit breaker 100 also includes a second flexible circuit board 62, one end of the second flexible circuit board 62 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. The second flexible circuit board 62 is provided with a temperature sensor and a voltage detector for respectively detecting the temperature and voltage of the first terminal 21.

[0042] like Fig. 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 the shape of a long strip 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 usually connected to the power supply line (power supply end) and is kept fixed and energized. The first terminal 21 connected to the moving contact 51 is usually connected to the load device (load end). In order to ensure the safety of electricity use at the load end, the voltage detector is used to detect the voltage of the first terminal 21, and the temperature sensor is used to detect the temperature of the first terminal 21.

[0043] As can be seen from the above, by using the second flexible circuit board 62 to connect the main control board 6 and the first terminal 21, the complex wiring structure inside the circuit breaker 100 can be simplified, and multiple wirings can be integrated into one flexible circuit board, which greatly facilitates the installation and production of parts, reduces the difficulty of assembly and improves the efficiency of large-scale production.

[0044] Furthermore, the terminal assembly 2 also includes a terminal block 25 connected to the first terminal 21, and 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 and the contacts of the voltage detector or the temperature sensor fit tightly, thereby reducing fluctuations in contact resistance, reducing poor contact caused by vibration, temperature changes or mechanical deformation, and avoiding voltage measurement errors.

[0045] In addition, during the operation of the circuit breaker 100, the terminal block 25 may expand / contract due to the temperature rise (Joule heat) generated by the current or the change in ambient temperature. The elasticity of the spring can absorb such deformation, avoid stress concentration or contact point separation caused by rigid connection, so as to maintain long-term stable electrical connection and extend the life of the equipment.

[0046] In one embodiment, the switch assembly 5 further includes an operating mechanism 53 connected to the moving contact 51, the operating mechanism 53 is used to drive the moving contact 51 to move, and the second flexible circuit board 62 is further provided with a position indicator 621 connected to the operating mechanism 53, and the position indicator 621 is used to detect the position information of the operating mechanism 53; And / or, a signal light 622 is further provided on the second flexible circuit board 62; And / or, a button 623 is further provided on the second flexible circuit board 62 .

[0047] like Fig. 9 As shown, in one embodiment of the present invention, the second flexible circuit board 62 is also 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.

[0048] Furthermore, the signal light 622 is arranged on the second flexible circuit board 62 and is electrically connected to the main control board 6. The housing 1 is provided with a light-transmitting area at the position corresponding to the signal light 622. The light-transmitting area can be a light-through hole arranged on the housing 1, or the position of the housing 1 corresponding to the signal light 622 is set to a light-transmitting material. The signal light 622 is used to indicate the working state of the circuit breaker 100. By displaying different colors, it indicates that the circuit of the circuit breaker 100 is closed, disconnected or a fault warning, so as to prompt the operator to pay attention. The position indicator 621 is electrically connected to the main control board 6, and the main control board 6 can display the state of the circuit breaker 100 through the signal light 622 according to the information of the position indicator 621.

[0049] Furthermore, a button 623 is also provided on the second flexible circuit board 62, and the button 623 is electrically connected to the main control board 6, and is mainly used for operation, reset, test, overload protection, short circuit protection and address setting. The operator can control the button 623 to perform corresponding operations through the information transmitted by the signal light 622 to achieve different functions. It can be understood that the first flexible circuit board 61 and the second flexible circuit board 62 are used to replace the complex wiring in the original circuit breaker 100, so that the internal space utilization of the housing 1 can be further improved, which is conducive to controlling the overall volume of the circuit breaker 100, so that the circuit breaker 100 can be suitable for some space-constrained scenes.

[0050] Further, such as Fig. 9 and Fig.10 As shown, in one embodiment of the present invention, a button 11 is further provided on the shell 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 shell 1 and abut against the key 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 shell 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 disconnected 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 to quickly judge the state of the circuit breaker 100 and avoid misoperation.

[0051] In one embodiment, the main body of the circuit breaker 100 also includes an arc extinguishing device 3 arranged in the shell 1, 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.

[0052] 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, and the arc extinguishing cover 31 is open on one side facing the moving contact 51 and the static contact 52. Figure 3 The moving contact 51 and the stationary 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 stationary contact 52 is arranged on the second conductive member 24. When the power is on, the moving contact 51 abuts against the stationary contact 52. When the moving contact 51 and the stationary 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. Combined with the reference Figure 6 The mounting base 41 of the current detection device 4 is located 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 discharge efficiency of the plasma.

[0053] It should be noted that after the conventional current transformer is replaced with the magnetic sensor 43, the internal space required for the housing 1 to install the current detection device 4 is smaller, and the back of the mounting seat 41 away from the magnetic sensor 43 is provided with a guide groove 41c, and the mounting seat 41 is abutted against the inner wall of the housing 1 to form an exhaust channel 4a at the position of the guide groove 41c. Furthermore, a guide block 411 can also be provided in the guide groove 41c, and the guide blocks 411 are arranged at staggered intervals so that the exhaust channel 4a is bent and extended, which helps to change the direction of plasma flow and increase the contact time between plasma and air, thereby effectively helping to cool the plasma, so that it can be discharged from the outside of the housing 1 more smoothly and controllably, and avoid plasma from damaging the internal parts of the circuit breaker 100.

[0054] In one embodiment, the housing 1 is provided with a first opening 1b and a second opening 1c corresponding to the first wiring terminal 21 and the second wiring terminal 22, respectively, and the exhaust passage 4a is connected to the second opening 1c; And / or, an exhaust port 1d is further provided on the housing 1 corresponding to the arc extinguishing device 3 .

[0055] 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 a 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, and 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. 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.

[0056] It can be understood that arranging multiple components along the first direction in the shell 1 can effectively save space and reduce the vertical height occupied by the equipment, and the horizontal arrangement is conducive to 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.

[0057] 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 hood 31 close to the current detection device 4. The plurality of through holes 31a of the arc extinguishing hood 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 discharge efficiency of the plasma and improving the safety of the equipment.

[0058] In one embodiment of the present invention, the circuit breaker 100 further includes a tripping mechanism 7, which is arranged above the arc extinguishing device 3, and the second conductive member 24 is partially wound around the tripping mechanism 7. When the current inside the second conductive member 24 reaches a preset value, the magnetic field generated by the current inside the second conductive member 24 drives the tripping mechanism 7 to push the operating mechanism 53 to move, so as to separate the moving contact 51 from the static contact 52. It should be noted that the part of the second conductive member 24 arranged on the mounting seat and the part wound around the tripping mechanism 7 can be an integral structure or a split structure connected by welding, which is not specifically limited.

[0059] Further, in another embodiment of the present invention, the circuit breaker 100 further includes a driving mechanism (not shown) disposed in the housing, the driving mechanism being disposed on the tripping mechanism 7 and being 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 can control the driving mechanism to push the tripping mechanism 7 to move, so that the tripping mechanism 7 pushes the operating mechanism 53 to separate the moving contact 51 and the static contact 52, thereby ensuring the safety of the circuit breaker 100. Of course, the current detection device 4 can also be used only to detect the current size. As for whether to add the driving mechanism, it can be selected and set according to the actual situation, and no specific limitation is made here.

[0060] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are 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 and a current detection 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-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 penetrated 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 current flowing through the second conductive member.

2. The circuit breaker according to claim 1, characterized in that 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 which has an opening on one side.

3. The circuit breaker according to claim 2, characterized in that The second conductive member is extended 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 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 disposed in the mounting groove, and the shielding member is disposed 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, characterized in that The circuit breaker further includes a main control board arranged 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 groove and is electrically connected to the magnetic sensor.

6. The circuit breaker according to claim 5, characterized in that The main control board is arranged on a side of the mounting base away from the limiting 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 arranged 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, characterized in that 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. A temperature sensor and a voltage detector are provided on the second flexible circuit board to respectively detect the temperature and voltage of the first terminal.

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

9. The circuit breaker according to claim 1, characterized in that: The circuit breaker also includes an arc extinguishing device arranged in the shell, the current detection device is arranged 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.

10. The circuit breaker according to claim 9, characterized in that The housing is provided with a first opening and a second opening corresponding to the first wiring terminal and the second wiring terminal, respectively, and the exhaust passage is connected to the second opening; And / or, an exhaust port is further provided on the shell corresponding to the arc extinguishing device.

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