A smart circuit breaker drive mechanism and circuit breaker

Abstract

This utility model discloses a transmission mechanism for an intelligent circuit breaker, including a housing with an operating mechanism, a handle rotatably mounted on the housing and linked to the operating mechanism via a connecting rod, a drive motor and a reduction gear set fixedly mounted inside the housing and connected to it, as well as some gears and a pull rod; some gears are rotatably mounted on the housing and mesh with the reduction gear set, and are incomplete gear structures with arc grooves on their surfaces; three ribs are provided on the side of some gears for driving the operating mechanism to disengage; one end of the pull rod is hinged to the handle, and the other end is slidably embedded in the arc groove to realize manual / automatic mode switching. The intelligent circuit breaker includes the above-mentioned intelligent circuit breaker transmission mechanism. This utility model, through the setting of some gears and a pull rod, effectively solves the problem caused by the need to add a plastic part between the handle and the gear to realize manual and automatic switching in the prior art. The overall structure is simple and low-cost, and the reliability is significantly improved, with high space utilization.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical equipment technology, specifically relating to an intelligent circuit breaker transmission mechanism and a circuit breaker. Background Technology

[0002] With the rapid development of low-voltage power distribution systems towards intelligence and digitalization (such as 5G base stations, smart grids, and smart home applications), traditional manually operated miniature circuit breakers can no longer meet the needs of remote automatic opening and closing, status monitoring, and rapid response. Currently, most smart circuit breakers on the market employ a dual-mode transmission mechanism combining motor drive and manual operation. To achieve the drive connection between the transmission mechanism and the operating mechanism, the mainstream solution typically adds a dedicated plastic clutch between the operating handle and the drive gear. This component enables switching between manual and automatic modes, but it has the following drawbacks:

[0003] (1) The structure is complex and the cost is high. The clutch needs to be produced by independent mold, which increases the material cost. The assembly accuracy requirement is high, which leads to a decrease in production efficiency.

[0004] (2) Lack of reliability: Plastic parts are prone to aging and deformation under long-term mechanical stress (especially in high-temperature environments), which may cause clutch failure and lead to jamming when switching between manual and automatic modes. Multi-component linkage structures have the risk of motion interference. For example, if the clearance between the gear and the clutch is too small, it may cause the transmission to jam.

[0005] (3) Low space utilization rate. The additional clutch occupies the internal space of the circuit breaker, which restricts the miniaturization design and makes it difficult to adapt to the installation requirements of high-density electrical cabinets. Utility Model Content

[0006] To address the aforementioned problems, the purpose of this utility model is to provide an intelligent circuit breaker transmission mechanism and circuit breaker that is simple in structure, high in cost, highly reliable, and has high space utilization.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] A smart circuit breaker transmission mechanism includes a housing with an operating mechanism mounted on it, a handle rotatably mounted on the housing and linked to the operating mechanism via a connecting rod, and a drive motor and a reduction gear set fixedly mounted inside the housing and connected to it in transmission; it also includes a partial gear and a pull rod; the partial gear is rotatably mounted on the housing and meshes with the reduction gear set, and it has an incomplete gear structure (a portion of its outer edge has teeth, and another portion is an arc surface), with an arc groove on its surface; the side of the partial gear has a raised rib for driving the operating mechanism to trip; one end of the pull rod is hinged to the handle, and the other end is slidably embedded in the arc groove to realize manual / automatic mode switching.

[0009] Furthermore, the center of the arc groove coincides with the center of a portion of the gear.

[0010] Furthermore, the third rib is located on the edge of the arc segment of part of the gear, and its position corresponds to the preset release pin position on the locking component of the operating mechanism. When part of the gear rotates counterclockwise, the third rib can push the release pin to trigger release.

[0011] Furthermore, the gear is located on the front side of the housing, the operating mechanism is located on the rear side of the housing, and the housing has a through hole for the release pin to extend to the front side of the housing and cooperate with the rib.

[0012] Furthermore, the gear has three rotational positions: free position, closed position, and open position; before manually or automatically switching between the closed and open positions, it must first be reset to the free position.

[0013] Furthermore, the intelligent circuit breaker transmission mechanism also includes a PCB (circuit board), on which micro switch one, micro switch two, and micro switch three are mounted; rib one and rib two are mounted on some gears; rib one rotates with some gears and triggers micro switch one to detect the free position; rib two rotates with some gears and triggers micro switch two to detect the open position; a handle rib is mounted on the handle, and the handle rib rotates with the handle and triggers micro switch three to detect the closed position.

[0014] Furthermore, both the first and second ribs are located on the front side of a portion of the gears, while the third rib is located on the rear side of a portion of the gears.

[0015] This utility model also provides an intelligent circuit breaker, including the aforementioned intelligent circuit breaker transmission mechanism.

[0016] The beneficial effects of this utility model are as follows:

[0017] (1) Simple structure and low cost: By using the combination design of tie rod and arc groove, the traditional plastic clutch is replaced, reducing the number of parts and reducing material and mold costs; at the same time, the assembly process is also simplified, eliminating the need for precise adjustment of clutch clearance and improving production efficiency.

[0018] (2) Significantly improved reliability: The integrated rib design avoids motion interference and eliminates the risk of jamming caused by the aging of traditional plastic parts; the arc groove design ensures smooth sliding trajectory of the pull rod, and the opening and closing action is smooth, thus improving the mechanical life.

[0019] (3) High space utilization: Some gears integrate position detection and drive functions, saving the internal space occupied by traditional clutch components and adapting to the installation requirements of high-density electrical cabinets. Attached Figure Description

[0020] The structure of this utility model will be further described in detail below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of the intelligent circuit breaker described in this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the gear described in this utility model when it is in a free position.

[0023] Figure 3 This is a schematic diagram of the structure of the gear described in this utility model when it is in the closed position.

[0024] Figure 4 This is a schematic diagram of the structure of the gear described in this utility model when it is in the open (disengaged) position.

[0025] Figure 5 This is a schematic diagram of the intelligent circuit breaker transmission mechanism described in this utility model.

[0026] Figure 6 This is a schematic diagram of the front side of one of the gears described in this utility model.

[0027] Figure 7 This is a schematic diagram of the rear side of a portion of the gears described in this utility model.

[0028] Figure 8 This is a schematic diagram of the handle described in this utility model.

[0029] The figure shows: 1-handle, 2-housing, 3-operating mechanism, 4-moving contact, 5-stationary contact, 6-pull rod, 7-partial gear, 71-rib one, 72-rib two, 73-rib three, 75-circular groove, 8-reduction gear set, 9-drive motor, 101-micro switch one, 102-micro switch two, 103-micro switch three. Detailed Implementation

[0030] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. The described embodiments are merely some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. It should be noted that the terms "comprising," "including," or any other variations are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Example 1

[0033] like Figure 1-8 As shown, this embodiment provides a smart circuit breaker transmission mechanism, including a handle 1, a housing 2, a pull rod 6, a partial gear 7, a reduction gear set 8, and a drive motor 9.

[0034] The housing 2 serves as the mounting base for the various components of the circuit breaker, and the operating mechanism 3 for driving the moving contact 4 and the stationary contact 5 to open and close the circuit breaker is installed on the rear side of the housing 2.

[0035] The handle 1 is rotatably mounted on the housing 2, and has two circular holes 12 and 13 on it, with its upper end extending out of the housing 2. A connecting rod is hinged to one of the circular holes 13, and the other end of the connecting rod is linked to the operating mechanism 3. The handle 1 can drive the operating mechanism 3 through the connecting rod to realize the opening and closing of the circuit breaker.

[0036] The drive motor 9 is fixedly mounted on the front side of the housing 2, and a worm gear is installed at its output end.

[0037] The reduction gear set 8 is fixedly installed inside the housing 2 and is connected to the drive motor 9 for transmission. The reduction gear set 8 consists of several meshing double-layer reduction gears. In this embodiment, the reduction gear set 8 includes three double-layer reduction gears, namely reduction gear one, reduction gear two, and reduction gear three. Reduction gear one consists of a worm gear and a spur gear with an outer diameter smaller than the worm gear arranged coaxially. The worm gear cooperates with the worm at the output end of the drive motor 9 (the worm gear and worm gear cooperation realizes self-locking and anti-reverse rotation, ensuring the stability of the opening and closing position). Reduction gear two consists of two coaxially arranged spur gears, one large and one small. The large gear meshes with the spur gear of reduction gear one. Reduction gear three also consists of two coaxially arranged spur gears, one large and one small. The large gear meshes with the small gear of reduction gear two, and the small gear meshes with part of the gear 7.

[0038] The partial gear 7 is rotatably mounted on the housing 2 and meshes with the reduction gear set 8. It is a disc-shaped incomplete gear structure (three-quarters of its outer perimeter has continuous teeth, and the remaining quarter is an arc surface). An arc groove 75 is formed on the surface of the partial gear 7, and the center of the arc groove 75 coincides with the center of the partial gear 7, ensuring that the movement trajectory of the pull rod 6 is smooth and without jamming. A raised rib 73 for driving the operating mechanism 3 to trip is provided on the rear side of the partial gear 7. The raised rib 73 is located at the edge of the arc segment of the partial gear 7 and on the rear side of the partial gear 7. Its position corresponds to the position of the pre-set trip pin 121 on the locking member 12 of the operating mechanism 3. When the partial gear 7 rotates counterclockwise, the raised rib 73 can push the trip pin 121 to trigger (locking member 12) to trip, thereby causing the moving contact 4 to separate from the stationary contact 5. The gear 7 has three rotational positions: free position, closed position, and open position. Before manually or automatically switching between the closed and open positions, the drive motor 9 must be started first, and the gear 7 is reset to the free position via the reduction gear set 8. In the free position, the handle 1 can be manually operated, and the handle 1 pulls the operating mechanism 3 via the connecting rod to realize the manual opening and closing of the circuit breaker. In the free position, the gear 7 can also be driven clockwise by the drive motor 9, and the handle 1 can be pulled by the pull rod 5 to rotate. The handle 1 then pulls the operating mechanism 3 via the connecting rod to realize the automatic closing of the circuit breaker. In the free position, the gear 7 can also be driven counterclockwise by the drive motor 9, so that the rib 3 73 rotates counterclockwise with the gear 7 to contact the trip pin 121 of the locking element 12 and push the trip pin 121 to trigger the locking element 12 to trip, so that the moving contact 4 separates from the stationary contact 5, realizing the opening of the circuit breaker.

[0039] One end of the pull rod 6 is hinged in the pre-set circular hole 12 of the handle 1, and the other end is slidably embedded in the arc groove 75, realizing the manual / automatic mode switching and simplifying the structure.

[0040] The gear 7 is located on the front side of the housing 2, and the operating mechanism 3 is located on the rear side of the housing 2. The housing 2 is provided with a through hole for the release pin 121 to extend to the front side of the housing 2 and cooperate with the rib 3 73, so as to solve the problem of spatial interference. Example 2

[0041] To achieve accurate detection of the position (open, closed, or free position) of some gears 7, this embodiment adds the following settings based on embodiment 1.

[0042] like Figure 1 As shown, the intelligent circuit breaker transmission mechanism also includes a PCB, on which microswitches 101, 102, and 103 are mounted. A control circuit electrically connected to each of the microswitches 101, 102, and 103 is also provided on the PCB to receive position signals from them. Ribs 71 and 72 are mounted on a portion of the gears 7; rib 71 rotates with the gears 7 and triggers microswitch 101 to detect the free position (confirming the free position); rib 72 rotates with the gears 7 and triggers microswitch 102 to detect the open position (confirming the open position); a handle rib 11 is mounted on the handle 1, and the handle rib 11 rotates with the handle 1 and triggers microswitch 103 to detect the closed position (confirming the closed position). Both rib 1 (71) and rib 2 (72) are located on the front side of part of the gear 7. Example 3

[0043] A smart circuit breaker includes the smart circuit breaker transmission mechanism described in Embodiments 1 and 2.

[0044] Working principle:

[0045] Manual opening and closing:

[0046] like Figure 2 As shown, if the circuit breaker power-on software detects the authorization signal from the upper-level communication, the drive motor 9 drives the transmission gear set 8 to rotate, causing the protrusion rib 71 on part of the gear 7 to hit the micro switch 101 on the PCB 10 (if the micro switch 101 is not triggered within 3 seconds, the power supply to the drive motor 9 is cut off and an alarm is triggered), the drive motor 9 stops, and part of the gear 7 stops in the free position. The circuit breaker can then be manually opened and closed. During the manual opening and closing process, when the handle 1 is turned back and forth, the pull rod 6 slides back and forth along the arc groove 75 without causing part of the gear 7 to rotate (during the manual opening and closing process, part of the gear 7 remains stationary).

[0047] Automatic tripping (opening and closing):

[0048] Automatic closing: When part of gear 7 stops as shown Figure 2In the free position shown, the drive motor 9 starts and drives the transmission gear set 8 to rotate, which in turn drives the drive gear 7 to rotate clockwise. The drive gear 7 drives the handle 1 to rotate via the pull rod 6. The handle 1 drives the operating mechanism 3 to operate via the connecting rod, thereby closing the circuit breaker. Its state is as follows. Figure 3 As shown, when the handle protrusion 11 on the handle 1 rotates with the handle 1 to trigger the micro switch 3 103 (if the micro switch 3 103 is not triggered and jamming occurs, the drive motor 9 will automatically cut off power after 2 seconds to prevent stalling and burnout), the control circuit on the PCB 10 detects the closing signal, the closing is successful, the drive motor 9 reverses, and drives part of the gear 7 back to the free position.

[0049] Automatic tripping (disengagement): The drive motor 9 starts and drives part of the gear 7 to rotate counterclockwise. The rib 72 on part of the gear 7 rotates to trigger micro switch 102 (if micro switch 102 is triggered but the moving contact does not separate, a mechanical fault is determined). At the same time, the rib 73 on the rear side of part of the gear 7 touches the trip post 121 on the locking element 12. The locking element 12 disengages from the tripping element, the operating mechanism 3 unlocks and trips, and the moving contact 4 separates from the stationary contact 5, realizing the tripping of the circuit breaker. Its state is as follows. Figure 4 As shown.

[0050] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0051] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0052] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this utility model shall fall within the scope of protection of this utility model.

Claims

1. A transmission mechanism for an intelligent circuit breaker, comprising a housing (2) on which an operating mechanism (3) is mounted, a handle (1) rotatably mounted on the housing (2), and a drive motor (9) and a reduction gear set (8); characterized in that: It also includes a gear (7) and a lever (6); the gear (7) is rotatably mounted on the housing (2) and meshes with the reduction gear set (8). It is an incomplete gear structure and has an arc groove (75) on its surface; a rib (73) is provided on the side of the gear (7) for disengaging the drive operating mechanism (3); one end of the lever (6) is hinged to the handle (1), and the other end is slidably embedded in the arc groove (75) to realize manual / automatic mode switching.

2. The intelligent circuit breaker transmission mechanism according to claim 1, characterized in that: The center of the arc groove (75) coincides with the center of part of the gear (7).

3. The intelligent circuit breaker transmission mechanism according to claim 1, characterized in that: The rib three (73) is set on the edge of the arc segment of part of the gear (7), and its position corresponds to the position of the pre-set release pin (121) on the operating mechanism (3). When part of the gear (7) rotates counterclockwise, the rib three (73) can push the release pin (121) to trigger the release.

4. The intelligent circuit breaker transmission mechanism according to claim 3, characterized in that: The gear (7) is located on the front side of the housing (2), the operating mechanism (3) is located on the rear side of the housing (2), and the housing (2) has a through hole for the release pin (121) to extend to the front side of the housing (2) and cooperate with the rib (73).

5. The intelligent circuit breaker transmission mechanism according to claim 1, characterized in that: The gear (7) has a free position, a closed position and an open position; before manually or automatically switching between the closed and open positions, it must be reset to the free position.

6. The intelligent circuit breaker transmission mechanism according to claim 5, characterized in that: It also includes a PCB, on which micro switch one (101), micro switch two (102) and micro switch three (103) are installed; rib one (71) and rib two (72) are installed on part of the gear (7); rib one (71) rotates with part of the gear (7) and triggers micro switch one (101) to detect the free position; rib two (72) rotates with part of the gear (7) and triggers micro switch two (102) to detect the open position; handle rib (11) is installed on handle (1), handle rib (11) rotates with handle (1) and triggers micro switch three (103) to detect the closed position.

7. The intelligent circuit breaker transmission mechanism according to claim 6, characterized in that: The first rib (71) and the second rib (72) are both located on the front side of the gear (7), and the third rib (73) is located on the rear side of the gear (7).

8. An intelligent circuit breaker, characterized in that: Includes the intelligent circuit breaker drive mechanism as described in any one of claims 1-6.

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