Miniature circuit breaker with reclosing function

Abstract

The utility model provides a miniature circuit breaker with a reclosing function, which belongs to the technical field of circuit breakers and comprises a circuit breaker unit and a reclosing unit. The reclosing unit comprises a shell, a motor, a first gear, a second gear, a third gear and a transmission piece, an output shaft of the motor is a worm, the first gear comprises a first gear part and a second gear part, the second gear comprises a third gear part and a fourth gear part, the third gear comprises a fifth gear part and a transmission part, and the transmission piece is arranged on the shell. A first sector tooth part is arranged on the periphery of the transmission part, a second sector tooth part is arranged on the periphery of the transmission part, and the transmission part and the operation handle are connected and rotate synchronously; according to the utility model, the transmission ratio can be flexibly adjusted by adjusting the diameter of each gear part in the first gear and the second gear, the miniaturization requirement of the circuit breaker is not influenced, and the load can be uniformly distributed through the transmission of multiple groups of gears.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a small circuit breaker with a reclosing function. Background Art

[0002] Circuit breakers are critical devices in power systems, used to protect and control circuits to prevent damage to load devices caused by faults such as overcurrent, short circuits, and overloads. They utilize electromagnetic and thermal principles to achieve opening and closing operations. When the current in the circuit exceeds the rated value or a fault occurs, the circuit breaker's electromagnetic coil generates a magnetic field, separating the contacts and interrupting the current flow. Simultaneously, the bimetallic strip bends due to heat, causing the contacts to separate and interrupt the current flow. Circuit breakers are widely used in various locations, including industrial, commercial, high-rise, and residential buildings, providing overcurrent and leakage protection for electrical equipment such as motors, distribution lines, and lighting circuits.

[0003] Some circuit breakers include a recloser, an automated switching device used to restore lines in power distribution systems. It automatically opens when it detects a short circuit or overload, then attempts to reclose after a predetermined interval to check whether the fault has cleared. If the fault persists, the recloser opens again and, after a certain number of attempts (usually three or four), remains open unless the fault has cleared.

[0004] In the prior art, patent publication number CN106057600B discloses a reclosing device for a circuit breaker, which includes a motor, a worm, a half gear, a gear and a handle gear. The worm is meshed with the half gear, the gear and the half gear are coaxially arranged and rotate synchronously, and the gear is meshed with the handle gear. The handle gear can be rotated by the motor to realize the opening and closing of the circuit breaker. However, this structure mainly transmits power through the integrated half gear and gear, which increases the difficulty of adjusting the gear transmission ratio. It is not easy to control the volume of the gear and the handle gear. Therefore, it is impossible to meet both the transmission ratio adjustment requirements of the circuit breaker and the miniaturization requirements of the circuit breaker. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a small circuit breaker with a reclosing function.

[0006] The technical solution adopted by the present utility model is as follows: A small circuit breaker with a reclosing function includes at least one circuit breaker unit and a reclosing unit, the circuit breaker unit includes an operating handle, the operating handle is connected to a synchronously rotating transmission shaft, the reclosing unit includes a housing and a motor, a first gear, a second gear, a third gear and a transmission member arranged in the housing, the output shaft of the motor is a worm, the first gear includes a first gear portion and a second gear portion, the diameter of the first gear portion is larger than the diameter of the second gear portion, the second gear includes a third gear portion and a fourth gear portion, the diameter of the third gear portion is larger than the diameter of the fourth gear portion, the third gear includes a fifth gear portion and a transmission portion, the outer periphery of the transmission portion is provided with a first sector tooth portion, the outer periphery of the transmission member is provided with a second sector tooth portion, the worm is meshed with the first gear portion, the second gear portion is meshed with the third gear portion, the fourth gear portion is meshed with the fifth gear portion, the first sector tooth portion of the transmission portion is meshed with the second sector tooth portion of the transmission member, and the transmission member is connected to the operating handle and rotates synchronously.

[0007] The motor further comprises a circuit board arranged in the shell, the motor is connected to the circuit board, and the circuit board is provided with a control port and a feedback port.

[0008] The operating handle is provided with a first linkage hole extending axially therethrough, and the transmission member is provided with a second linkage hole coaxially with the first linkage hole. The first linkage hole and the second linkage hole are matching polygonal holes.

[0009] The shell includes a base and an upper cover. A mounting portion for the upper cover to be embedded is provided on a side of the upper cover facing the base. The base and the upper cover are respectively provided with a coaxial first through hole and a second through hole.

[0010] The base is provided with a first shaft portion, a second shaft portion and a third shaft portion, and the upper cover is provided with a first positioning hole for inserting one end of each shaft portion corresponding to the first shaft portion, the second shaft portion and the third shaft portion, the first gear is rotatably provided on the first shaft portion, the second gear is rotatably provided on the second shaft portion, and the third gear is rotatably provided on the third shaft portion.

[0011] The base is provided with a first mounting groove corresponding to the motor, and the upper cover is provided with a second mounting groove corresponding to the motor. The bottoms of the first mounting groove and the second mounting groove are provided with a plurality of ribs for supporting the motor.

[0012] The circuit board is provided with an opening through which the power supply motor passes, and conductive connecting pieces are provided on both sides of the rear end of the motor. The conductive connecting pieces are provided with ridge-shaped contact ends facing the circuit board, and a protrusion is provided on the base corresponding to the ridge-shaped contact end. The ridge-shaped contact end abuts between the circuit board and the protrusion, and a guide surface is provided on the side of the protrusion facing the motor.

[0013] The top of the ridge-shaped contact end is arranged in an arc-shaped surface.

[0014] The transmission member includes a rotating shaft portion, the second sector tooth portion is arranged on the outer periphery of the middle portion of the rotating shaft portion, and the base and the upper cover are both provided with a second positioning hole for the rotating shaft portion to be inserted.

[0015] The circuit breaker unit includes an operating mechanism, a moving contact, a static contact, a bimetallic strip and an arc extinguishing chamber. An arc striking channel is provided between the arc extinguishing chamber and the moving contact and the static contact. The arc striking channel is arranged in an arc shape. The arc striking channel includes a first port facing the position where the moving contact and the static contact are disconnected and a second port facing the arc extinguishing chamber, and the cross-section gradually increases from the first port to the second port.

[0016] The beneficial effects of the present invention are as follows: in the present invention, by adjusting the diameter of each gear part in the first gear and the second gear, the transmission ratio can be flexibly adjusted without affecting the miniaturization requirements of the circuit breaker, and multiple sets of gear transmissions can evenly distribute the load and reduce the bearing pressure of a single gear, thereby improving the reliability of the transmission structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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, without paying creative labor, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0018] Figure 1 A schematic diagram of the present utility model;

[0019] Figure 2 It is a partial explosion diagram of the utility model;

[0020] Figure 3 This is an exploded view of the reclosing unit in the present utility model;

[0021] Figure 4 This is a schematic diagram of a circuit breaker unit in the present invention;

[0022] Figure 5 Schematic diagram of the reclosing unit in this utility model Figure 1 ;

[0023] Figure 6 This is a schematic diagram of the upper cover of the present utility model;

[0024] Figure 7 Schematic diagram of the reclosing unit in this utility model Figure 2 ;

[0025] Figure 8 It is a partial schematic diagram of the reclosing unit in the utility model. DETAILED DESCRIPTION

[0026] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0027] In the description of this application, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting this application. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0029] In the description of this application, it should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0030] Example 1:

[0031] like Figures 1 to 8As shown, a small circuit breaker with a reclosing function includes at least one circuit breaker unit 1 and a reclosing unit 2. The circuit breaker unit 1 includes an operating handle 3, and the operating handle 3 is connected to a transmission shaft 4 that rotates synchronously. In this embodiment, four circuit breaker units 1 are provided, and the operating handles 3 of the four circuit breaker units 1 are connected by the transmission shaft 4 so that they can rotate synchronously. In this way, one reclosing unit 2 can be used to achieve one-to-many operation, thereby reducing the number of reclosing units 2 and reducing the cost of the product.

[0032] The reclosing unit 2 includes a housing 21 and a motor 22, a first gear 23, a second gear 24, a third gear 25 and a transmission member 26 arranged in the housing 21. The output shaft of the motor 22 is a worm 221. The first gear 23 includes a first gear portion 231 and a second gear portion 232. The diameter of the first gear portion 231 is larger than the diameter of the second gear portion 232. The second gear 24 includes a third gear portion 241 and a fourth gear portion 242. The diameter of the third gear portion 241 is larger than the diameter of the fourth gear portion 242. The third gear 25 includes a fifth gear portion 251 and a transmission portion 252. The outer periphery of the transmission portion 252 is provided with a first sector tooth portion 201, and the outer periphery of the transmission member 26 is provided with a second sector tooth portion 202. By rotating the gear along the axis Two transmission parts are set to make full use of the longitudinal space in the shell. The worm 221 is engaged with the first gear part 231, which can convert the high-speed and low-torque output of the motor 22 into a low-speed and high-torque output. The second gear part 232 is engaged with the third gear part 241, and the fourth gear part 242 is engaged with the fifth gear part 251. The first sector tooth portion 201 of the transmission part 252 is engaged with the second sector tooth portion 202 of the transmission member 26. The transmission member 26 is connected to the operating handle 3 and rotates synchronously. By adjusting the diameter of each gear part in the first gear 23 and the second gear 24, the transmission ratio can be flexibly adjusted without affecting the miniaturization requirements of the circuit breaker. In addition, multiple sets of gear transmissions can evenly distribute the load, reduce the bearing pressure of a single gear, and thus improve the reliability of the transmission structure.

[0033] It also includes a circuit board 5 arranged in the housing 21. The motor 22 is connected to the circuit board 5 and can integrate the control logic of the circuit breaker. Through the control port 51, external instructions, such as commands to open or close the circuit, can be received, and then these instructions are converted into motion control signals for the motor, thereby realizing the automation and intelligence of the circuit breaker operation. The circuit board 5 is provided with a control port 51 and a feedback port 52. The circuit board 5 can be provided with a power supply to power the motor 22, or a power connection port can be provided. Among them, the feedback port 52 allows the circuit board 5 to receive feedback signals of the motor 22 and the circuit breaker status, which can ensure the accuracy and timeliness of the circuit breaker operation, and can prevent and diagnose faults. In addition, the circuit board 5 can reduce the traditional wiring structure, especially reduce the routing and wiring in the compact internal space of the small circuit breaker.

[0034] The operating handle 3 is axially provided with a first linkage hole 31 extending therethrough. The transmission member 26 is provided with a second linkage hole 261 coaxially therewith. The first linkage hole 31 and the second linkage hole 261 are matching polygonal holes. The polygonal shape can withstand greater torque without slipping, thereby enhancing torque transmission efficiency. In this embodiment, the first linkage hole 31 and the second linkage hole 261 are matching triangular holes, and the transmission shaft 4 is a triangular rod.

[0035] The shell 21 includes a base 211 and an upper cover 212. The upper cover 212 is provided with a mounting portion 213 for embedding the upper cover 212 on the side facing the base 211, which can reduce the width of the product. At the same time, there is no splicing gap in the appearance, making the overall product more beautiful. The base 211 and the upper cover 212 are respectively provided with a coaxial first through hole and a second through hole 214, and multiple circuit breaker units 1 and a reclosing unit 2 can be fixed through a special fixed long axis.

[0036] The base 211 is provided with a first shaft portion 203, a second shaft portion 204 and a third shaft portion 205. The upper cover 212 is provided with a first positioning hole 206 for inserting one end of each shaft portion corresponding to the first shaft portion 203, the second shaft portion 204 and the third shaft portion 205. The first gear 23 is rotatably set on the first shaft portion 203, the second gear 24 is rotatably set on the second shaft portion 204, and the third gear 25 is rotatably set on the third shaft portion 205. Each shaft portion can be integrally formed with the base 211 or fixed on the base 211. The correct installation of each gear ensures the maximization of transmission efficiency and the minimization of kinetic energy loss, thereby improving the stability and operating efficiency of the entire transmission system.

[0037] A first mounting groove 207 is provided on the base 211 corresponding to the motor 22, and a second mounting groove 208 is provided on the upper cover 212 corresponding to the motor 22, which simplifies the positioning and installation process of the motor and improves the assembly efficiency. A plurality of ribs 209 for supporting the motor 22 are provided at the bottom of the first mounting groove 207 and the second mounting groove 208, which increase the heat dissipation space at the bottom of the motor 22 and help dissipate the heat generated when the generator 22 is running.

[0038] The circuit board 5 is provided with an opening through which the power supply machine 22 passes. Conductive connecting pieces 14 are provided on both sides of the rear end of the motor 22. The conductive connecting pieces 14 are deformable. The conductive connecting pieces are provided with ridge-shaped contact ends 141 facing the circuit board 5. A bump 15 is provided on the base 211 corresponding to the ridge-shaped contact end 141. The ridge-shaped contact end 141 abuts between the circuit board 5 and the bump 15, providing a stable and reliable electrical connection, ensuring smooth current transmission between the motor 22 and the circuit board 5, and the ridge-shaped contact end 141 abuts against the lower end surface of the circuit board 5, which can improve the vibration resistance of the motor 22 during operation.

[0039] A guide surface 151 is provided on the side of the protrusion facing the motor 22 , which helps the conductive connecting piece 14 to deform along the guide surface 151 .

[0040] The top of the ridge-shaped contact end 141 is provided with an arcuate surface 142, which is electrically connected to the circuit board 5. Since the contact area is relatively smooth, it will cause less wear than right-angled or sharp edges, thus extending the service life of the contact end and the corresponding contact component. Furthermore, it provides a larger contact area, thereby reducing contact resistance and improving contact reliability.

[0041] The transmission member 26 includes a rotating shaft portion 262, and the second sector tooth portion 202 is arranged on the outer periphery of the middle part of the rotating shaft portion 262. The base 211 and the upper cover 212 are both provided with a second positioning hole 200 for inserting the rotating shaft portion 262. The rotating shaft portion 262 can be accurately positioned to ensure the precise engagement of the transmission member 26 with other gears or transmission parts.

[0042] The circuit breaker unit 1 includes an operating mechanism 6, a moving contact 7, a static contact 8, a bimetallic strip 9 and an arc extinguishing chamber 10. An arc striking channel 11 is provided between the arc extinguishing chamber 10 and the moving contact 7 and the static contact 8. The arc striking channel 11 is arranged in an arc shape. When the moving contact 7 and the static contact 8 are disconnected, the arc can be more effectively introduced into the arc extinguishing chamber 10 through the arc-shaped design of the arc striking channel 11. Since the arc has been elongated and cooled before entering the arc extinguishing chamber, it is conducive to rapid arc extinguishing.

[0043] The arc striking channel 11 includes a first port 111 facing the position where the moving contact 7 and the static contact 8 are disconnected, and a second port 112 facing the arc extinguishing chamber 10, and the cross-section gradually increases from the first port 111 to the second port 112, which helps to disperse the arc energy, reduce thermal damage to the moving and static contacts and other circuit breaker components, and can form a stronger arc extinguishing airflow inside the arc striking channel 11, thereby improving the cooling effect of the arc.

[0044] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A small circuit breaker with a reclosing function, comprising at least one circuit breaker unit (1) and a reclosing unit (2), wherein the circuit breaker unit (1) comprises an operating handle (3), and the operating handle (3) is connected to a synchronously rotating transmission shaft (4), characterized in that: The reclosing unit (2) comprises a housing (21), and a motor (22), a first gear (23), a second gear (24), a third gear (25) and a transmission member (26) arranged in the housing (21); the output shaft of the motor (22) is a worm (221); the first gear (23) comprises a first gear portion (231) and a second gear portion (232); the diameter of the first gear portion (231) is greater than the diameter of the second gear portion (232); the second gear (24) comprises a third gear portion (241) and a fourth gear portion (242); the diameter of the third gear portion (241) is greater than the diameter of the fourth gear portion (242); The three gears (25) include a fifth gear portion (251) and a transmission portion (252); a first sector tooth portion (201) is arranged on the outer periphery of the transmission portion (252); a second sector tooth portion (202) is arranged on the outer periphery of the transmission member (26); the worm (221) is meshed with the first gear portion (231); the second gear portion (232) is meshed with the third gear portion (241); the fourth gear portion (242) is meshed with the fifth gear portion (251); the first sector tooth portion (201) of the transmission portion (252) is meshed with the second sector tooth portion (202) of the transmission member (26); and the transmission member (26) is connected to the operating handle (3) and rotates synchronously.

2. A miniature circuit breaker with a reclosing function according to claim 1, characterized in that: It also includes a circuit board (5) arranged in the housing (21), the motor (22) is connected to the circuit board (5), and the circuit board (5) is provided with a control port (51) and a feedback port (52).

3. A miniature circuit breaker with a reclosing function according to claim 1, characterized in that: The operating handle (3) is provided with a first linkage hole (31) extending therethrough in the axial direction, and the transmission member (26) is provided with a second linkage hole (261) coaxially with the first linkage hole (31); the first linkage hole (31) and the second linkage hole (261) are matching polygonal holes.

4. A miniature circuit breaker with a reclosing function according to claim 2, characterized in that: The housing (21) comprises a base (211) and an upper cover (212); a mounting portion (213) for embedding the upper cover (212) is provided on a side of the upper cover (212) facing the base (211); and the base (211) and the upper cover (212) are respectively provided with a coaxial first through hole and a second through hole (214).

5. A miniature circuit breaker with a reclosing function according to claim 4, characterized in that: The base (211) is provided with a first shaft portion (203), a second shaft portion (204) and a third shaft portion (205); the upper cover (212) is provided with a first positioning hole (206) for inserting one end of each shaft portion corresponding to the first shaft portion (203), the second shaft portion (204) and the third shaft portion (205); the first gear (23) is rotatably provided on the first shaft portion (203); the second gear (24) is rotatably provided on the second shaft portion (204); and the third gear (25) is rotatably provided on the third shaft portion (205).

6. A miniature circuit breaker with a reclosing function according to claim 4, characterized in that: The base (211) is provided with a first mounting groove (207) corresponding to the motor (22), the upper cover (212) is provided with a second mounting groove (208) corresponding to the motor (22), and a plurality of convex ribs (209) for supporting the motor (22) are provided at the bottom of the first mounting groove (207) and the second mounting groove (208).

7. A miniature circuit breaker with a reclosing function according to claim 6, characterized in that: The circuit board (5) is provided with an opening through which the power supply machine (22) passes; conductive connecting sheets (14) are provided on both sides of the rear end of the motor (22); the conductive connecting sheets are provided with ridge-shaped contact ends (141) facing the circuit board (5); a protrusion (15) is provided on the base (211) corresponding to the ridge-shaped contact ends (141); the ridge-shaped contact ends (141) are abutted between the circuit board (5) and the protrusion (15); and a guide surface (151) is provided on the side of the protrusion facing the motor (22).

8. A miniature circuit breaker with a reclosing function according to claim 7, characterized in that: The top of the ridge-shaped contact end (141) is arranged in the form of an arc-shaped surface (142).

9. A miniature circuit breaker with a reclosing function according to claim 4, characterized in that: The transmission member (26) includes a rotating shaft portion (262), the second sector tooth portion (202) is arranged on the outer periphery of the middle portion of the rotating shaft portion (262), and the base (211) and the upper cover (212) are both provided with a second positioning hole (200) for the rotating shaft portion (262) to be inserted.

10. A miniature circuit breaker with a reclosing function according to claim 1, characterized in that: The circuit breaker unit (1) comprises an operating mechanism (6), a moving contact (7), a stationary contact (8), a bimetallic strip (9) and an arc extinguishing chamber (10); an arc striking channel (11) is arranged between the arc extinguishing chamber (10) and the moving contact (7) and the stationary contact (8); the arc striking channel (11) is arranged in an arc shape; the arc striking channel (11) comprises a first port (111) facing a position where the moving contact (7) and the stationary contact (8) are disconnected and a second port (112) facing the arc extinguishing chamber (10); and a cross section gradually increases along a direction from the first port (111) to the second port (112).

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