Automatic opening and closing control mechanism for small circuit breaker and circuit breaker

Abstract

The present invention provides a small circuit breaker automatic opening and closing control mechanism and a circuit breaker. The small circuit breaker automatic opening and closing control mechanism includes a housing, a driving motor, a reduction gear set, a double-layer special-shaped reduction opening incomplete gear, an air-break release connecting rod, a linkage shaft driving the closing incomplete gear and a wrench linkage shaft, as well as a trip lever, a leakage trip electromagnet and a leakage circuit board; the driving motor drives the double-layer special-shaped reduction opening incomplete gear and the linkage shaft to drive the closing incomplete gear to rotate to achieve closing; or the protrusion on the double-layer special-shaped reduction opening incomplete gear hits one end of the air-break release connecting rod to achieve opening. In the leakage state, the leakage trip electromagnet is energized to generate magnetism, driving the trip lever to hit the air-break release connecting rod to achieve automatic opening. The small circuit breaker automatic opening and closing control mechanism has a compact structure and a small size, and realizes multifunctional automatic opening and closing control of the circuit breaker within an 18mm space.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliance protection, and in particular to a small circuit breaker automatic opening and closing control mechanism and a circuit breaker. Background Art

[0002] Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. Low-voltage circuit breakers are also called automatic switches. They are electrical appliances that have both manual switch functions and can automatically perform loss of voltage, undervoltage, overload, and short-circuit protection. They can be used to distribute electrical energy, start asynchronous motors infrequently, and protect power lines and motors. When they have serious overloads or short circuits and undervoltage faults, they can automatically cut off the circuit. Its function is equivalent to the combination of fuse switches and over-underheating relays, and generally no parts need to be changed after breaking the fault current, and it has been widely used. For leakage conditions, electromagnetic mechanisms are used, which have faster breaking speed and breaking capacity than motor operating mechanisms. However, when the electromagnetic mechanism is closed, the coil must be energized for a long time to keep the moving and static iron cores attracted, thereby consuming a lot of electrical energy. In addition, the existing electromagnetic mechanisms are large in size and only provide power-off protection under leakage conditions, and cannot achieve multi-functional closing and opening operation control. Summary of the invention

[0003] The main purpose of the present invention is to provide a small circuit breaker automatic opening and closing control mechanism and a circuit breaker, aiming to solve the technical problem that the circuit breaker in the prior art cannot realize multifunctional opening and closing operation control.

[0004] To achieve the above-mentioned purpose, an embodiment of the present invention provides an automatic opening and closing control mechanism for a small circuit breaker, the automatic opening and closing control mechanism for a small circuit breaker comprising: a housing, a driving motor fixed on the housing, a reduction gear set rotatably arranged on the housing, a double-layer special-shaped reduction opening incomplete gear, an air-break release connecting rod, a linkage shaft driving the closing incomplete gear and a wrench linkage shaft connected to the linkage shaft driving the closing incomplete gear, a trip lever matched with the air-break release connecting rod, a leakage tripping electromagnet arranged on the trip lever and a leakage circuit board for controlling the power supply of the leakage tripping electromagnet;

[0005] The driving motor transmits power through the reduction gear set and the double-layer special-shaped deceleration opening incomplete gear; the double-layer special-shaped deceleration opening incomplete gear drives the linkage shaft to drive the closing incomplete gear to rotate back and forth between the opening position and the closing position, and then rotates the wrench linkage shaft to achieve automatic opening and closing; the driving motor rotates, and when the double-layer special-shaped deceleration opening incomplete gear is disengaged from the linkage shaft driving the closing incomplete gear, the linkage shaft driving the closing incomplete gear can rotate freely, realizing manual opening and closing;

[0006] When the leakage circuit board detects a leakage state, the leakage circuit board energizes the leakage tripping electromagnet, which generates magnetism, drives the tripping lever to hit the air breaker release connecting rod, so that the tripping linkage shaft on the air breaker release connecting rod drives the tripping linkage structure inside the circuit breaker to trip, thereby realizing automatic opening.

[0007] Optionally, a protrusion is provided on the double-layer special-shaped deceleration and opening incomplete gear, one end of the air-breaker releaser connecting rod cooperates with the protrusion, and the other end is connected to the tripping linkage shaft of the tripping linkage structure inside the circuit breaker body; the driving motor transmits power to the double-layer special-shaped deceleration and opening incomplete gear through the reduction gear group, and the double-layer special-shaped deceleration and opening incomplete gear rotates to the opening position, and the protrusion hits one end of the air-breaker releaser connecting rod, so that the tripping linkage shaft at the other end of the air-breaker releaser connecting rod drives the tripping linkage structure inside the circuit breaker to trip, thereby realizing automatic opening.

[0008] Optionally, the double-layer special-shaped speed reduction and opening incomplete gear includes an incomplete gear part and a complete gear part; the incomplete gear part is coaxially fixedly connected with the complete gear part, the incomplete gear part is meshed with the linkage shaft driving the closing incomplete gear, and the complete gear part is meshed with the speed reduction gear group; a protrusion is provided on the side of the complete gear part away from the incomplete gear part.

[0009] Optionally, the air switch release connecting rod includes a first connecting rod and a second connecting rod; the first end of the first connecting rod cooperates with the protrusion, and the second end of the first connecting rod is fixedly connected to the first end of the second connecting rod; the first end of the second connecting rod cooperates with the tripping lever, and the second end of the second connecting rod is provided with a tripping linkage shaft hole connected to the tripping linkage structure inside the circuit breaker body.

[0010] Optionally, the reduction gear set includes a first reduction gear and a second reduction gear, the first reduction gear includes a coaxially arranged worm gear and a spur gear, the spur gear is meshed with the second reduction gear, and the second reduction gear is meshed with a double-layer special-shaped reduction brake incomplete gear.

[0011] Optionally, the output shaft of the drive motor is formed as a worm, and the worm is meshed with a worm wheel on the first reduction gear.

[0012] Optionally, the worm is a crosshead worm, the crosshead is arranged at an end away from the driving motor, and the housing is provided with an opening corresponding to the crosshead worm for rotating.

[0013] Optionally, a first gear position detection sensor for detecting the closing and opening states is provided on the double-layer special-shaped deceleration and opening incomplete gear; and the small circuit breaker automatic opening and closing control mechanism also includes a first gear position detection circuit board electrically connected to the first gear position detection sensor and the drive motor.

[0014] Optionally, a second gear position detection sensor for detecting closing and opening states is provided on the linkage shaft driving incomplete closing gear; the small circuit breaker automatic opening and closing control mechanism also includes a second gear position detection circuit board electrically connected to the second gear position detection sensor and the drive motor.

[0015] The present invention also provides a circuit breaker, including a circuit breaker body, the circuit breaker also including the above-mentioned small circuit breaker automatic opening and closing control mechanism, wherein the other end of the air switch release connecting rod is connected to the tripping linkage structure inside the circuit breaker body through a tripping linkage shaft.

[0016] The invention discloses an automatic opening and closing control mechanism for a small circuit breaker and a circuit breaker. The driving motor drives the reduction gear set and the double-layer special-shaped reduction opening incomplete gear to transmit power. The double-layer special-shaped reduction opening incomplete gear rotates in the clockwise direction, driving the linkage shaft to drive the closing incomplete gear to rotate in the counterclockwise direction, thereby rotating the wrench linkage shaft to achieve closing. Alternatively, the double-layer special-shaped reduction opening incomplete gear rotates in the clockwise direction, and the protrusion hits one end of the air switch release connecting rod, so that the release linkage shaft at the other end of the air switch release connecting rod drives the release linkage structure inside the circuit breaker to release, thereby achieving opening. When the leakage circuit board detects the leakage state, the leakage circuit board energizes the leakage release electromagnet, and the leakage release electromagnet generates magnetism, driving the release lever to hit the air switch release connecting rod, so that the release linkage shaft on the air switch release connecting rod drives the release linkage structure inside the circuit breaker to release, thereby achieving automatic opening. The automatic opening and closing control mechanism of the miniature circuit breaker has a compact structure and a small size, and realizes multifunctional automatic closing and opening control of the circuit breaker within an 18mm space. 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 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.

[0018] Figure 1 It is a structural schematic diagram of an embodiment of a circuit breaker of the present invention;

[0019] Figure 2 It is a structural schematic diagram of an embodiment of an automatic opening and closing control mechanism for a small circuit breaker of the present invention;

[0020] Figure 3 for Figure 2 Another structural schematic diagram of an embodiment;

[0021] Figure 4 for Figure 2 Another structural schematic diagram of an embodiment;

[0022] Figure 5 It is a structural schematic diagram of a hollow tripper connecting rod in an automatic opening and closing control mechanism of a small circuit breaker of the present invention;

[0023] Figure 6 It is a schematic diagram of the structure of the crosshead worm in the automatic opening and closing control mechanism of the miniature circuit breaker of the present invention;

[0024] Figure 7 The figure is a schematic diagram of the appearance structure of the circuit breaker of the present invention.

[0025] Description of Figure Numbers:

[0026] Label name Label name 1 case 2 Drive motor 3 Reduction gear set 4 Double-layer special-shaped deceleration brake incomplete gear 5 Linkage shaft drives the closing incomplete gear 6 Wrench linkage shaft 7 Circuit breaker wrench 8 Air switch release connecting rod 9 Trip lever 11 Opening 21 Crosshead worm gear 31 First reduction gear 311 Worm gear 312 Spur gears 32 Second reduction gear 41 Incomplete gear part 42 Complete gear unit 421 Bump 43 First gear position detection sensor 51 Second gear position detection sensor 81 First connecting rod 82 Second connecting rod 811 First connecting rod first end 812 First connecting rod second end 821 Second connecting rod first end 822 Second connecting rod second end 8221 Trip linkage shaft hole 91 Leakage tripping electromagnet 92 Leakage circuit board

[0027] 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

[0028] 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.

[0029] In the present invention, the descriptions involving "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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is 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.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. 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.

[0032] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0033] The present invention provides a small circuit breaker automatic opening and closing control mechanism, such as Figures 1 to 6 As shown, in one embodiment of an automatic opening and closing control mechanism for a small circuit breaker of the present invention, the automatic opening and closing control mechanism for a small circuit breaker includes: a shell 1, a driving motor 2 fixed on the shell 1, a reduction gear set 3 rotatably arranged on the shell 1, a double-layer special-shaped reduction opening incomplete gear 4, an air switch release connecting rod 8, a linkage shaft driving closing incomplete gear 5, a wrench linkage shaft 6 connected to the linkage shaft driving closing incomplete gear 5 and a circuit breaker wrench 7 connected to the wrench linkage shaft 6, as well as a tripping lever 9 cooperating with the air switch release connecting rod 8, a leakage tripping electromagnet 91 arranged on the tripping lever 9 and a leakage circuit board 92 for controlling the power supply of the leakage tripping electromagnet 91.

[0034] The driving motor 2 transmits power to the double-layer special-shaped deceleration opening incomplete gear 4 through the reduction gear set 3; the double-layer special-shaped deceleration opening incomplete gear 4 drives the linkage shaft to drive the closing incomplete gear 5 to rotate back and forth between the opening position and the closing position, and then rotates the wrench linkage shaft 6 to drive the circuit breaker wrench 7 to rotate in the closing direction, thereby realizing automatic opening and closing; the driving motor 2 rotates, and when the double-layer special-shaped deceleration opening incomplete gear 4 is disengaged from the linkage shaft driving the closing incomplete gear 5, the linkage shaft driving the closing incomplete gear 5 can rotate freely, thereby realizing manual opening and closing.

[0035] When the leakage circuit board 92 detects a leakage state, the leakage circuit board 92 energizes the leakage tripping electromagnet 91, and the leakage tripping electromagnet 91 generates magnetism, driving the tripping lever 9 to hit the air switch release connecting rod 8, so that the tripping linkage shaft on the air switch release connecting rod 8 drives the tripping linkage structure inside the circuit breaker to trip, thereby realizing automatic opening.

[0036] The above-mentioned drive motor 2 is electrically connected to the control circuit board on the circuit breaker body (not shown in the figure). When the circuit breaker is in the open state, the drive motor 2 rotates in one direction, such as forward rotation, according to the control instruction of the control circuit board, so that the reduction gear set 3 rotates, and the reduction gear set 3 drives the double-layer special-shaped reduction opening incomplete gear 4 to rotate in the clockwise direction, and then the linkage shaft drives the closing incomplete gear 5 to rotate in the counterclockwise direction. When it rotates to the closed position, the linkage shaft drives the closing incomplete gear 5 to drive the wrench linkage shaft 6 to rotate, so that the circuit breaker wrench 7 rotates in the closing direction to achieve automatic closing.

[0037] Furthermore, the control circuit board controls the driving motor 2 to rotate. When it rotates to the point where the double-layer special-shaped deceleration opening incomplete gear 4 is disengaged from the linkage shaft driving closing incomplete gear 5, at this time, the linkage shaft driving closing incomplete gear 5 can rotate freely within a certain range relative to the double-layer special-shaped deceleration opening incomplete gear 4, so that the circuit breaker wrench 7 can move freely to realize manual opening and closing.

[0038] When a leakage occurs in the circuit breaker connection circuit provided with a small circuit breaker automatic opening and closing control mechanism, the leakage circuit board 92 controls the leakage tripping electromagnet 91 to be energized, and the leakage tripping electromagnet 91 after being energized generates magnetism, so that the tripping lever 9 moves toward the air switch tripping device connecting rod 8, hits the air switch tripping device connecting rod 8, and causes the tripping linkage shaft on the air switch tripping device connecting rod 8 to drive the tripping linkage structure inside the circuit breaker to trip, thereby realizing automatic opening under leakage conditions. Among them, the leakage circuit board 92 can be set separately from the control circuit board (not shown in the figure) on the circuit breaker body, or it can be set in an integral molding.

[0039] As described above, the automatic opening and closing control mechanism of the small circuit breaker can realize automatic opening and closing under overload, short circuit, undervoltage, and leakage conditions, and can realize manual opening and closing and other functions. Through the cooperation between the reduction gear group 3, the double-layer special-shaped reduction opening incomplete gear 4, the air switch release connecting rod 8, the linkage shaft driving the closing incomplete gear 5, the wrench linkage shaft 6 connected to the linkage shaft driving the closing incomplete gear 5 and the circuit breaker wrench 7 connected to the wrench linkage shaft 6, the automatic opening and closing control mechanism of the small circuit breaker has a simple and compact structure, good opening and closing linkage, and fast opening and closing speed; under the leakage condition, the electromagnetic mechanism can realize rapid opening and strong breaking capacity; and the circuit breaker can be controlled by multifunctional automatic closing and opening within an 18mm space.

[0040] Furthermore, in another embodiment of the automatic opening and closing control mechanism of a small circuit breaker of the present invention, a protrusion 421 is provided on the double-layer special-shaped deceleration opening incomplete gear 4, one end of the air-breaker release connecting rod 8 cooperates with the protrusion 421, and the other end is connected to the tripping linkage shaft of the tripping linkage structure inside the circuit breaker body; the driving motor 2 transmits power to the double-layer special-shaped deceleration opening incomplete gear 4 through the reduction gear group 3, and the double-layer special-shaped deceleration opening incomplete gear 4 rotates in a clockwise direction, and the protrusion 421 hits one end of the air-breaker release connecting rod 8, so that the tripping linkage shaft at the other end of the air-breaker release connecting rod 8 drives the tripping linkage structure inside the circuit breaker to trip, thereby realizing automatic opening.

[0041] When the circuit breaker provided with the automatic opening and closing control mechanism of the small circuit breaker detects that the connection circuit is not within the normal use range, the driving motor 2 further rotates according to the control instruction of the control circuit board. When it reaches the opening position, the protrusion 421 provided on the double-layer special-shaped deceleration opening incomplete gear 4 hits one end of the air switch releaser connecting rod 8 to drive the air switch releaser connecting rod 8 to rotate. At this time, the tripping linkage shaft on the other end of the air switch releaser connecting rod 8 will drive the tripping linkage structure inside the circuit breaker body to trip, so that the circuit breaker automatically opens, thereby achieving the function of protecting the circuit.

[0042] Further, in another embodiment of the automatic opening and closing control mechanism of a small circuit breaker of the present invention, the double-layer special-shaped deceleration opening incomplete gear 4 includes an incomplete gear portion 41 and a complete gear portion 42; the incomplete gear portion 41 is coaxially fixedly connected with the complete gear portion 42, the incomplete gear portion 41 is meshed with the linkage shaft driving closing incomplete gear 5, and the complete gear portion 42 is meshed with the reduction gear set 3. The protrusion 421 is arranged on the side of the complete gear portion 42 away from the incomplete gear portion 41.

[0043] The position of the protrusion 421 and the position of the gear in the incomplete gear part 41 are not in the same radial direction of the complete gear part 42, and when the protrusion 421 hits the air switch release connecting rod 8, the gear of the incomplete gear part 41 and the linkage shaft driving the closing incomplete gear 5 are in a disengaged state.

[0044] In this way, the transmission, opening and closing functions of the automatic opening and closing control mechanism of the small circuit breaker are realized through the incomplete gear part 41, the complete gear part 42 and the protrusion 421 of the double-layer special-shaped speed reduction opening incomplete gear 4.

[0045] Furthermore, in another embodiment of the automatic opening and closing control mechanism of a miniature circuit breaker of the present invention, Figure 5As shown, the air switch release connecting rod 8 includes a first connecting rod 81 and a second connecting rod 82; the first connecting rod first end 811 cooperates with the protrusion 421, and the first connecting rod second end 812 is fixedly connected to the second connecting rod first end 821; the second connecting rod first end 821 cooperates with the tripping lever 9, and the second connecting rod second end 822 is provided with a tripping linkage shaft hole 8221 connected to the tripping linkage structure inside the circuit breaker body.

[0046] The opening and closing of the mechanical transmission and the opening of the electromagnetic mechanism under the leakage state are realized through the same circuit breaker release connecting rod 8, which simplifies the structure of the components and makes the structure of the automatic opening and closing control mechanism of the small circuit breaker more compact and smaller in size.

[0047] Further, in another embodiment of the automatic opening and closing control mechanism of a small circuit breaker of the present invention, the reduction gear set 3 includes a first reduction gear 31 and a second reduction gear 32, the first reduction gear 31 includes a coaxially arranged worm gear 311 and a spur gear 312, the spur gear 312 is meshed with the second reduction gear 32, and the second reduction gear 32 is meshed with the double-layer special-shaped reduction opening incomplete gear 4. The output shaft of the drive motor 2 is formed as a crosshead worm 21, the crosshead worm 21 is meshed with the worm gear 311 on the first reduction gear 31, the crosshead of the crosshead worm 21 is arranged at an end away from the drive motor 2, and the housing 1 is provided with an opening 11 corresponding to the crosshead worm 21 for rotating.

[0048] In a structural form in which the driving motor 2 transmits power through the reduction gear set 3, in order to make the structure more compact and occupy less space, the output shaft of the driving motor 2 is formed as a crosshead worm 21, and the first reduction gear 31 connected to the driving motor 2 is coaxially arranged with a worm wheel 311 and a spur gear 312, or the first reduction gear 31 includes a coaxially arranged helical gear and a spur gear 312, wherein the crosshead worm 21 is meshed with the worm wheel 311 or the helical gear, and the spur gear 312 is meshed with the second reduction gear 32. In this way, reliable power transmission is achieved through the double-layer gear structure.

[0049] When a power outage occurs or the mechanical transmission components in the automatic opening and closing control mechanism of the small circuit breaker are locked, a screwdriver can be used to manually rotate the crosshead worm 21 through the opening 11, thereby driving the reduction gear group 3 to transmit power, and then driving the double-layer special-shaped reduction opening incomplete gear 4 to rotate, to achieve manual unlocking, so as to avoid the problem that the automatic opening and closing control mechanism of the small circuit breaker cannot be started normally when it is locked, resulting in the inability to automatically control the opening and closing of the switch.

[0050] Optionally, in another embodiment of the automatic opening and closing control mechanism of a small circuit breaker of the present invention, a first gear position detection sensor 43 for detecting the closing and opening states is provided on the double-layer special-shaped deceleration opening incomplete gear 4. The automatic opening and closing control mechanism of a small circuit breaker further includes a first gear position detection circuit board (not shown in the figure) electrically connected to the first gear position detection sensor 43 and the drive motor 2.

[0051] By setting a first gear position detection sensor 43 on the double-layer special-shaped deceleration opening incomplete gear 4, the position of the gear can be detected more accurately, whether it is in the opening position or the closing position, thereby more accurately controlling the rotation of the drive motor 2, and then controlling the operation of the double-layer special-shaped deceleration opening incomplete gear 4.

[0052] The linkage shaft driving closing incomplete gear 5 is provided with a second gear position detection sensor 51 for detecting the closing and opening states. The miniature circuit breaker automatic opening and closing control mechanism also includes a second gear position detection circuit board (not shown in the figure) electrically connected to the second gear position detection sensor 51 and the drive motor 2.

[0053] By setting a first gear position detection sensor 43 on the linkage shaft driving the incomplete closing gear 5, the position of the gear can be detected more accurately, whether it is in the open position or the closed position, thereby more accurately controlling the rotation of the drive motor 2, and then controlling the linkage shaft driving the incomplete closing gear 5 to operate.

[0054] At least one of the first gear position detection sensor 43 and the second gear position detection sensor 51 is provided; the first gear position detection sensor 43 and the second gear position detection sensor 51 can be provided separately for use, or both can be provided for joint use, and further, the first gear position detection circuit board and the second gear position detection circuit board can also be provided as one body, or the first gear position detection circuit board or the second gear position detection circuit board can be provided on the control circuit board (not shown in the figure) on the circuit breaker body, so that the components constituting the automatic opening and closing control mechanism of the small circuit breaker are reduced, making the structure more compact. Of course, the first gear position detection sensor 43 and the second gear position detection sensor 51 are used together to more accurately detect the position of the gear rotation and realize the precise control of the opening and closing.

[0055] The present invention also provides a circuit breaker, such as Figure 7 As shown, the circuit breaker includes a circuit breaker body, and the circuit breaker also includes the automatic opening and closing control mechanism of the small circuit breaker in any of the above embodiments, wherein the other end of the air switch release connecting rod is connected to the tripping linkage structure inside the circuit breaker body through the tripping linkage shaft; the circuit breaker is a device for realizing automatic closing and opening control of the circuit within an 18mm space.

[0056] The above description is only a preferred 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 inventive 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 small circuit breaker automatic opening and closing control mechanism, characterized in that: The automatic opening and closing control mechanism of the small circuit breaker comprises: a housing, a driving motor fixed on the housing, a reduction gear set rotatably arranged on the housing, a double-layer special-shaped reduction opening incomplete gear, an air-break release connecting rod, a linkage shaft driving closing incomplete gear and a wrench linkage shaft connected to the linkage shaft driving closing incomplete gear, a tripping lever matched with the air-break release connecting rod, a leakage tripping electromagnet arranged on the tripping lever and a leakage circuit board for controlling the power supply of the leakage tripping electromagnet; The driving motor transmits power to the double-layer special-shaped deceleration and opening incomplete gear through the reduction gear set; when in the opening state, the driving motor is used to rotate forward and drive the double-layer special-shaped deceleration and opening incomplete gear to rotate clockwise through the reduction gear set, thereby driving the linkage shaft to drive the closing incomplete gear to rotate counterclockwise, so that the linkage shaft drives the closing incomplete gear to drive the circuit breaker wrench of the wrench linkage shaft to rotate in the closing direction to achieve automatic closing; when the double-layer special-shaped deceleration and opening incomplete gear rotates clockwise until it is disengaged from the linkage shaft driving the closing incomplete gear, the linkage shaft driving the closing incomplete gear can rotate freely within a preset range relative to the double-layer special-shaped deceleration and opening incomplete gear, so that the circuit breaker wrench can move freely to achieve manual opening and closing; The double-layer special-shaped deceleration and opening incomplete gear is provided with a protrusion, one end of the air-break release connecting rod cooperates with the protrusion, and the other end is connected to the release linkage shaft of the release linkage structure inside the circuit breaker body; the driving motor transmits power to the double-layer special-shaped deceleration and opening incomplete gear through the reduction gear set, so that the double-layer special-shaped deceleration and opening incomplete gear rotates clockwise to the opening position, so that the protrusion hits one end of the air-break release connecting rod, so that the release linkage shaft at the other end of the air-break release connecting rod drives the release linkage structure inside the circuit breaker to release, thereby realizing automatic opening; When the leakage circuit board detects a leakage state, the leakage circuit board energizes the leakage tripping electromagnet, which generates magnetism, drives the tripping lever to hit the air breaker release connecting rod, so that the tripping linkage shaft on the air breaker release connecting rod drives the tripping linkage structure inside the circuit breaker to trip, thereby realizing automatic opening.

2. The automatic opening and closing control mechanism for a small circuit breaker according to claim 1, characterized in that: The double-layer special-shaped speed reduction and opening incomplete gear includes an incomplete gear part and a complete gear part; the incomplete gear part is coaxially fixedly connected with the complete gear part, the incomplete gear part is meshed with the linkage shaft driving the closing incomplete gear, and the complete gear part is meshed with the speed reduction gear set; a protrusion is provided on the side of the complete gear part away from the incomplete gear part.

3. The automatic opening and closing control mechanism for a small circuit breaker according to claim 1, characterized in that: The air switch release connecting rod includes a first connecting rod and a second connecting rod; the first end of the first connecting rod cooperates with the protrusion, and the second end of the first connecting rod is fixedly connected to the first end of the second connecting rod; the first end of the second connecting rod cooperates with the tripping lever, and the second end of the second connecting rod is provided with a tripping linkage shaft hole connected to the tripping linkage structure inside the circuit breaker body.

4. The automatic opening and closing control mechanism for a small circuit breaker according to claim 1, characterized in that: The reduction gear set includes a first reduction gear and a second reduction gear, the first reduction gear includes a coaxially arranged worm gear and a spur gear, the spur gear is meshed with the second reduction gear, and the second reduction gear is meshed with a double-layer special-shaped reduction brake incomplete gear.

5. The automatic opening and closing control mechanism for a small circuit breaker according to claim 4, characterized in that: The output shaft of the driving motor is formed as a worm, which meshes with the worm wheel on the first reduction gear.

6. The automatic opening and closing control mechanism for a small circuit breaker according to claim 5, characterized in that: The worm is a crosshead worm, the crosshead is arranged at an end away from the driving motor, and the housing is provided with an opening corresponding to the crosshead worm for rotating.

7. The automatic opening and closing control mechanism for a small circuit breaker according to claim 1, characterized in that: The double-layer special-shaped deceleration and opening incomplete gear is provided with a first gear position detection sensor for detecting the closing and opening states; the small circuit breaker automatic opening and closing control mechanism also includes a first gear position detection circuit board electrically connected to the first gear position detection sensor and the drive motor.

8. The automatic opening and closing control mechanism for a small circuit breaker according to claim 1 or 7, characterized in that: A second gear position detection sensor for detecting the closing and opening states is arranged on the linkage shaft driving incomplete closing gear; the small circuit breaker automatic opening and closing control mechanism also includes a second gear position detection circuit board electrically connected to the second gear position detection sensor and the drive motor.

9. A circuit breaker, comprising a circuit breaker body, characterized in that: The circuit breaker also includes a small circuit breaker automatic opening and closing control mechanism as claimed in any one of claims 1 to 8, wherein the other end of the air switch release connecting rod is connected to the tripping linkage structure inside the circuit breaker body through a tripping linkage shaft.

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