Motor for circuit breaker
By employing bearing connections and segmented drive shaft design in the motor for circuit breakers, combined with a heat dissipation mechanism, the problem of thermal deformation caused by high-speed rotation of the worm gear is solved, ensuring the stability of the transmission mechanism and the normal operation of the micro switch, thus extending the service life of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG SHANGGUAN ELECTRIC CO LTD
- Filing Date
- 2025-03-30
- Publication Date
- 2026-04-28
AI Technical Summary
When the worm gear of the existing circuit breaker motor rotates at high speed, the top of the worm gear rotates with the copper block hole wall and the steel ball, generating high temperature, which causes thermal deformation of the shell, failure of the transmission mechanism, and failure of the micro switch to work properly, resulting in noise and economic losses.
The drive shaft is connected by bearings, and combined with a segmented drive shaft design and heat dissipation mechanism, the heat accumulation of the drive shaft during high-speed rotation is reduced. Heat transfer is reduced through bearings and heat dissipation holes, ensuring the stability of the transmission mechanism and the normal operation of the micro switch.
It effectively reduces heat buildup in the drive shaft during high-speed rotation, avoids housing deformation and transmission mechanism engagement failure, ensures normal operation of the micro switch, and extends the service life of the equipment.
Smart Images
Figure CN224177298U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of piezoelectric switchgear technology, specifically relating to a motor for circuit breakers. Background Technology
[0002] Circuit breakers are the core components of intelligent control. During electrical control operation, the electric operating mechanism rotates to the designated position, the microswitch activates, and the motor power is cut off. If the circuit breaker control fails, the entire system will become uncontrollable. In existing technology, the top of the motor worm gear uses a U-shaped copper block fixing component with a through hole in the middle. A steel ball is inserted into the through hole, and one end is sealed with an iron plate. The worm gear holds the steel ball to rotate.
[0003] In the above scheme, when the worm gear rotates at high speed, the top of the worm gear, the wall of the copper block hole, and the steel ball rapidly generate high temperatures as they rotate. The copper block fixing component will cause thermal deformation of the plastic shell that fixes the copper block. Because the deformation directly leads to the worm gear deflection, the deflection of the worm gear causes the gears in the transmission mechanism to separate, which can easily cause high noise and direct shaft gear jamming, causing the micro switch to fail to operate and resulting in unnecessary economic losses. Summary of the Invention
[0004] The purpose of this invention is to provide a circuit breaker motor with a simple structure and good temperature control.
[0005] To achieve the aforementioned objectives of this utility model, the technical solution of this application is as follows:
[0006] The electric motor used in this circuit breaker includes a housing, a transmission mechanism on the housing, a power mechanism fixedly connected to the housing, and a transmission mechanism drivingly connected to the power mechanism. The transmission mechanism includes a transmission shaft, which is rotatably connected to the housing and has a heat dissipation mechanism on the housing corresponding to the input shaft. The transmission mechanism is drivingly connected to a drive mechanism, which is drivingly connected to a micro switch.
[0007] In the aforementioned motor for circuit breakers, one end of the drive shaft is rotatably connected to the housing, and the other end is fixedly connected to the output shaft of the drive mechanism. A bearing is provided at the rotatable connection between the drive shaft and the housing, and a heat dissipation mechanism is provided outside the bearing in the housing.
[0008] In the aforementioned circuit breaker motor, the transmission shaft includes a first shaft and a second shaft. The first shaft is provided with a worm gear portion. The worm gear portion has a mounting portion on one side away from the second shaft and a connecting portion that mates with the second shaft on the other side.
[0009] In the aforementioned circuit breaker motor, the mounting portion includes a first shaft portion that matches the bearing inner ring shaft hole and a second shaft portion that is larger than the inner ring shaft hole and smaller than the outer side wall of the inner ring. The first shaft portion is inserted into the bearing inner ring shaft hole, and the end face of the second shaft portion abuts against the end face of the bearing inner ring.
[0010] In the aforementioned circuit breaker motor, the connecting part includes a connecting hole provided on the end face of the second shaft member, a positioning groove provided on the connecting hole, a connecting protrusion provided on the corresponding second shaft member, and a positioning block provided on the connecting protrusion.
[0011] In the aforementioned circuit breaker motor, the transmission mechanism further includes a gear set meshing with the worm gear, wherein a ratchet is coaxially arranged on the output gear of the gear set, and the ratchet is drivenly connected to the drive mechanism.
[0012] In the aforementioned circuit breaker motor, the gear set includes a first double gear, a second double gear, and a third double gear. The large gear of the first double gear meshes with the worm gear, and the small gear meshes with the large gear of the second double gear. The gear shaft of the second double gear is located on the side of the worm gear. The small gear of the second double gear is positioned on the side of the large gear of the second double gear near the worm gear. The first double gear meshes with the third double gear via the second double gear, bypassing the worm gear. The third double gear is coaxially arranged with the ratchet and fixedly connected to the same gear shaft.
[0013] In the aforementioned circuit breaker motor, the first double gear shaft is connected to the housing at a connecting section, and a gear bearing is provided on the connecting section. The gear bearing is embedded in the housing, and the housing has heat dissipation holes at the gear bearing location and a reinforcing structure is provided at the gear bearing mounting location.
[0014] In the aforementioned circuit breaker motor, the drive mechanism includes a pawl rotatably mounted on the housing, the pawl engaging with a ratchet, a paddle on the pawl that swings with the pawl, an extension arm on the paddle, and a trigger block at the end of the extension arm that moves closer to or further away from the micro switch button as the pawl swings.
[0015] In the aforementioned circuit breaker motor, the housing is provided with positioning holes for aligning the housing, vent holes for heat dissipation, and cable routing holes for wiring. The housing is also provided with a power mechanism mounting bracket, and the power mechanism is connected to the housing through the power mechanism mounting bracket.
[0016] In the aforementioned circuit breaker motor, the power mechanism includes a stator and a rotor. The stator is fixedly connected to the power mechanism mounting bracket, and the rotor is rotatably connected to the power mechanism mounting bracket. The rotor is disposed in the stator and is fixedly connected to the input shaft of the transmission mechanism.
[0017] In the aforementioned circuit breaker motor, the housing is provided with a connecting bracket and a bracket mounting base. The bracket mounting base protrudes from the housing and is provided with mounting holes. The connecting bracket is connected to the bracket mounting base through the mounting holes. The connecting bracket is provided with connecting holes. The housing is also provided with a bracket positioning block.
[0018] Compared with the prior art, the beneficial effects of this utility model are reflected in:
[0019] Compared to existing technologies, where the worm gear is fixed at the top by a U-shaped copper block, this invention uses bearings to significantly reduce the amount of heat generated by the output shaft during high-speed rotation, which can lead to housing deformation, failure of the transmission mechanism, especially the worm gear section and gear meshing, and prevent the micro switch from being triggered properly. Attached Figure Description
[0020] Figure 1 This is a structural schematic diagram of the present invention;
[0021] Figure 2 Exploded view provided for this utility model;
[0022] Figure 3 A cross-sectional view provided for this utility model;
[0023] Figure 4 This is a schematic diagram of the transmission mechanism provided by this utility model;
[0024] Figure 5 This is a schematic diagram of another angle transmission mechanism provided by this utility model;
[0025] Figure 6 This is a schematic diagram of the transmission shaft structure provided by this utility model.
[0026] The components include: micro switch a, housing 1, positioning hole 11, cable routing hole 12, vent hole 13, mounting bracket 14, connecting bracket 16, bracket mounting block 17, mounting hole 18, bracket positioning block 19, transmission mechanism 2, ratchet 22, power mechanism 3, stator 31, rotor 32, heat dissipation mechanism 5, bearing 51, heat dissipation through hole 52, drive mechanism 6, pawl 61, paddle 62, extension arm 63, trigger block 64, transmission shaft 7, first shaft 71, second shaft 72, connecting protrusion 721, positioning block 722, worm gear 73, mounting part 74, first shaft 741, second shaft 742, connecting part 75, connecting hole 751, positioning groove 752, gear set 8, first double gear 81, second double gear 82, and third double gear 83. Detailed Implementation
[0027] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0028] like Figure 1-6 As shown, the motor for this circuit breaker includes a housing 1, a transmission mechanism 2 is provided on the housing 1, a power mechanism 3 is fixedly connected to the housing 1, the transmission mechanism 2 is driven by the power mechanism 3, the transmission mechanism 2 includes a transmission shaft 7, the transmission shaft 7 is rotatably connected to the housing 1 and a heat dissipation mechanism 5 corresponding to the transmission shaft 7 is provided on the housing 1, the transmission mechanism 2 is driven by a drive mechanism 6, and the drive mechanism 6 is driven by a micro switch a.
[0029] The heat dissipation mechanism 5 dissipates the heat generated by rotation, reducing heat accumulation and thus reducing the risk of shell deformation and transmission failure.
[0030] Furthermore, one end of the drive shaft 7 is rotatably connected to the housing, and the other end is fixedly connected to the output shaft of the drive mechanism 6. The drive mechanism 6 transmits power to the transmission mechanism 2 through the drive shaft 7. The heat dissipation mechanism 5 includes a bearing 51 disposed at the rotatable connection between the drive shaft 7 and the housing 1. The housing 1 has a heat dissipation through hole 52 corresponding to the bearing 51 on the outside of the bearing 51. Compared with the prior art, where the top of the worm is fixed by a U-shaped copper block, this invention, through the bearing, greatly reduces the large amount of heat generated by the output shaft under high-speed rotation, which could lead to housing deformation, failure of the transmission mechanism, especially the worm section and gear meshing, and prevent the micro switch from being triggered normally.
[0031] Preferably, the drive shaft 7 includes a first shaft member 71 and a second shaft member 72. A worm gear portion 73 is provided on the first shaft member 71. A mounting portion 74 is provided on the side of the worm gear portion 73 away from the second shaft member 72, and a connecting portion 75 that engages with the second shaft member 72 is provided on the other side. In this embodiment, the drive shaft 7 is segmented, consisting of a detachably connected first shaft member 71 and second shaft member 72. This reduces the length of the shaft members and improves the rigidity of the drive shaft 7. Furthermore, it allows for longitudinal tolerance between the first shaft member 71 and the second shaft member 72. Especially during worm gear transmission, the heat generated and the elongation and displacement of the first shaft member 71 in the longitudinal direction caused by screw transmission can be eliminated through the connecting portion 75.
[0032] Furthermore, the mounting portion 74 includes a first shaft portion 741 that matches the inner ring bore of the bearing 51, and a second shaft portion 742 that is larger than the inner ring bore and smaller than the outer wall of the inner ring. The first shaft portion 741 is inserted into the inner ring bore of the bearing 51, and the end face of the second shaft portion 742 abuts against the end face of the inner ring of the bearing 51. When the drive shaft 7 rotates at high speed, the drive shaft 7 is rotatably connected to the housing 1 through the bearing 51. Smooth and easy rotation is less likely to generate high temperatures compared to frictional rotation, which is less likely to cause thermal deformation of the housing and ensures the matching of the spacing between the shaft teeth.
[0033] Furthermore, the connecting part 75 includes a connecting hole 751 provided on the end face of the second shaft 72, and a positioning groove 752 is provided on the connecting hole 751. Correspondingly, a connecting protrusion 721 is provided on the second shaft 72, and a positioning block 722 is provided on the connecting protrusion 721. The first shaft 71 and the second shaft 72 are connected by a hinged joint, which eliminates the constant pressure on the housing 1 and the power mechanism 3 caused by the elongation and displacement of the shaft in the length direction, and can greatly extend the service life.
[0034] Preferably, the transmission mechanism 2 further includes a gear set 8 that meshes with the worm gear 73. A ratchet 22 is coaxially arranged in the gear set 8, and the ratchet 22 is driven by the drive mechanism 6. The power generated by the power mechanism changes the direction of rotation through the transmission mechanism 2 and is transmitted to the ratchet 22, which then transmits the power to the drive mechanism 6 to drive the micro switch a.
[0035] Furthermore, the gear set 8 includes a first double gear 81, a second double gear 82, and a third double gear 83. The large gear of the first double gear 81 meshes with the worm gear 73, and the small gear meshes with the large gear of the second double gear 82. The gear shaft of the second double gear 82 is located on the side of the worm gear 73. The small gear of the second double gear 82 is positioned on the side of its large gear near the worm gear 73. The first double gear 81 meshes with the third double gear 83 via the second double gear 82, bypassing the worm gear 73. The third double gear 83 is coaxially arranged with the ratchet 22 and fixedly connected to the same gear shaft. By rationally setting the meshing positions of the gears in the gear set 8, the overall volume is reduced.
[0036] In this embodiment, the connection section between the first double gear 81 gear shaft and the housing 1 is similar to the installation method of the transmission shaft 7 and the bearing 71. A gear bearing 811 is provided on the connection section. The gear bearing 811 is embedded in the housing 1. The housing 1 has heat dissipation holes at the gear bearing 811, which is conducive to heat dissipation and has a cooling effect. A reinforcing structure is provided at the location where the gear bearing 811 is installed. In this embodiment, the reinforcing structure can be a reinforcing ring on the outside of the bearing, or the housing wall thickness can be increased to improve the installation stability of the gear bearing 811.
[0037] Preferably, the drive mechanism 6 includes a pawl 61 rotatably mounted on the housing 1, the pawl 61 engaging with a ratchet 22, a paddle 62 that swings along with the pawl 61, an extension arm 63 on the paddle 62, and a trigger block 64 at the end of the extension arm 63 that moves closer to or further away from the micro switch a button as the pawl 61 swings. When the ratchet 22 is driven to rotate by the power mechanism, the pawl 61 is oscillated by the ratchet 22, and the pawl 61 drives the paddle 62, which in turn drives the trigger block 64 via the extension arm 63 to actuate the micro switch a.
[0038] Preferably, the housing 1 is provided with a positioning hole 11 for aligning the housing, an exhaust hole 13 for heat dissipation, and a cable routing hole 12 for wiring. The housing 1 is also provided with a power mechanism mounting bracket 14, and the power mechanism 3 is connected to the housing 1 through the power mechanism mounting bracket 14.
[0039] Furthermore, the power mechanism 3 includes a stator 31 and a rotor 32. The stator 31 is fixedly connected to the power mechanism mounting frame 14, and the rotor 32 is rotatably connected to the power mechanism mounting frame 14. The rotor 32 is disposed in the stator 31 and fixedly connected to the input shaft of the transmission mechanism 2. Changes in the magnetic field in the stator 31 drive the rotor 32 to rotate, thereby actuating the micro switch a through the transmission mechanism 2 and the drive mechanism 6.
[0040] The housing 1 is provided with a connecting bracket 16 and a bracket mounting base 17. The bracket mounting base 17 protrudes from the housing 1 and is provided with mounting holes. The connecting bracket 16 is connected to the bracket mounting base 17 through the mounting holes. The connecting bracket 16 is provided with mounting holes 18. The housing 1 is also provided with a bracket positioning block 19. The connecting bracket 16 is fixedly connected to the device or control board through the mounting holes 18, enhancing the adaptability of the motor. The bracket positioning block 19 on the housing 1 further stabilizes the connection between the connecting bracket 16 and the housing, thus better securing the motor.
[0041] In this embodiment, the connecting bracket 16 protrudes from the housing 1. The connecting bracket 16 includes a body and a connecting part. The connecting part and the body are integrally arranged in an L-shape. The connecting hole is provided on the connecting part. The body is also provided with a connecting plate, and the connecting hole is provided on the connecting plate.
[0042] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
[0043] Although this article uses a lot of terms such as micro switch a, housing 1, positioning hole 11, cable hole 12, vent hole 13, mounting bracket 14, connecting bracket 16, bracket mounting base 17, mounting hole 18, bracket positioning block 19, transmission mechanism 2, ratchet 22, power mechanism 3, stator 31, rotor 32, heat dissipation mechanism 5, bearing 51, heat dissipation through hole 52, drive mechanism 6, pawl 61, paddle 62, extension arm 63, trigger block 64, transmission shaft 7, first shaft 71, first shaft part 741, second shaft part 72, connecting protrusion 721, positioning block 722, worm part 73, worm part 73, mounting part 74, first shaft part 741, second shaft part 742, connecting part 75, connecting hole 751, positioning groove 752, gear set 8, first double gear 81, second double gear 82, third double gear 83, the possibility of using other terms cannot be excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would be contrary to the spirit of this utility model.
Claims
1. A circuit breaker motor, comprising a housing (1), characterized in that, The housing (1) is provided with a transmission mechanism (2), and a power mechanism (3) is fixedly connected to the housing (1). The transmission mechanism (2) is connected to the power mechanism (3) in a transmission manner. The transmission mechanism (2) includes a transmission shaft (7). The transmission shaft (7) is rotatably connected to the housing (1) and a heat dissipation mechanism (5) corresponding to the transmission shaft (7) is provided on the housing (1). The transmission mechanism (2) is connected to a drive mechanism (6), and the drive mechanism (6) is connected to a micro switch (a) in a drive manner.
2. The electric motor for circuit breakers according to claim 1, characterized in that, One end of the drive shaft (7) is rotatably connected to the housing, and the other end is fixedly connected to the output shaft of the drive mechanism (6). The heat dissipation mechanism (5) includes a bearing (51) located at the rotatable connection between the drive shaft (7) and the housing (1). The housing (1) has a heat dissipation through hole (52) corresponding to the bearing (51) outside the bearing (51).
3. The electric motor for circuit breakers according to claim 2, characterized in that, The drive shaft (7) includes a first shaft (71) and a second shaft (72). The first shaft (71) is provided with a worm gear (73). The worm gear (73) is provided with a mounting part (74) on one side away from the second shaft (72) and a connecting part (75) that connects with the second shaft (72) on the other side.
4. The electric motor for circuit breakers according to claim 3, characterized in that, The mounting portion (74) includes a first shaft portion (741) that matches the inner ring shaft hole of the bearing (51) and a second shaft portion (742) that is larger than the inner ring shaft hole and smaller than the outer side wall of the inner ring. The first shaft portion (741) is inserted into the inner ring shaft hole of the bearing (51), and the end face of the second shaft portion (742) abuts against the end face of the inner ring of the bearing (51).
5. The electric motor for a circuit breaker according to claim 3, characterized in that, The connecting part (75) includes a connecting hole (751) provided on the end face of the second shaft (72), a positioning groove (752) is provided on the connecting hole (751), and a connecting protrusion (721) is provided on the second shaft (72), and a positioning block (722) is provided on the connecting protrusion (721).
6. The electric motor for a circuit breaker according to claim 2, characterized in that, The transmission mechanism (2) further includes a gear set (8) meshing with the worm gear (73). A ratchet (22) is coaxially arranged in the gear set (8) with the output gear. The ratchet (22) is connected to the drive mechanism (6). The gear set (8) includes a first double gear (81), a second double gear (82), and a third double gear (83). The large gear of the first double gear (81) meshes with the worm gear (73), and the small gear meshes with the second double gear (82). The large gear of the second double gear (82) meshes with the worm gear (73). The gear shaft of the second double gear (82) is located on the side of the worm gear (73). The small gear of the second double gear (82) is arranged on the side of the large gear of the second double gear (82) close to the worm gear (73). The first double gear (81) meshes with the third double gear (83) by passing around the worm gear (73) through the second double gear (82). The third double gear (83) is coaxially arranged with the ratchet (22) and fixedly connected to the same gear shaft.
7. The electric motor for a circuit breaker according to claim 6, characterized in that, The first double gear (81) has a connecting section at the connection between the gear shaft and the housing (1). A gear bearing (811) is provided on the connecting section. The gear bearing (811) is embedded in the housing (1). The housing (1) has a heat dissipation hole at the gear bearing (811) and a reinforcing structure is provided at the location where the gear bearing (811) is installed.
8. The electric motor for a circuit breaker according to claim 7, characterized in that, The drive mechanism (6) includes a pawl (61) rotatably mounted on the housing (1), the pawl (61) meshing with a ratchet (22), a paddle (62) swinging along with the pawl (61) on the pawl (61), an extension arm (63) on the paddle (62), and a trigger block (64) at the end of the extension arm (63) that swings closer to or further away from the micro switch (a) button as the pawl (61) swings.
9. The electric motor for a circuit breaker according to claim 1, characterized in that, The housing (1) is provided with a positioning hole (11) for aligning the housing, an exhaust hole (13) for heat dissipation, and a cable routing hole (12) for wiring. The housing (1) is also provided with a power mechanism mounting bracket (14), and the power mechanism (3) is connected to the housing (1) through the power mechanism mounting bracket (14). The power mechanism (3) includes a stator (31) and a rotor (32). The stator (31) is fixedly connected to the power mechanism mounting frame (14), and the rotor (32) is rotatably connected to the power mechanism mounting frame (14). The rotor (32) is disposed in the stator (31) and is fixedly connected to the input shaft of the transmission mechanism (2).
10. The electric motor for a circuit breaker according to claim 1, characterized in that, The housing (1) is provided with a connecting bracket (16) and a bracket mounting base (17). The bracket mounting base (17) protrudes from the housing (1) and is provided with mounting holes. The connecting bracket (16) is connected to the bracket mounting base (17) through the mounting holes. The connecting bracket (16) is provided with mounting holes (18). The housing (1) is also provided with a bracket positioning block (19).