Electric operating mechanism of circuit breaker

Abstract

The utility model discloses an electric operating mechanism of a circuit breaker, which is characterized in that a motor is transversely and horizontally fixed and is provided with a worm; one end of the gear set is matched with the worm, the gear set comprises a first gear assembly and a second gear assembly, the rotation directions of the first gear assembly and the second gear assembly are opposite, the first gear assembly comprises a first upper gear, and the second gear assembly comprises a second upper gear; the rack drives the handle to move; in the first state, the first upper gear is meshed with the rack to drive the rack to move, and the second upper gear is separated from the rack; in the second state, the second upper gear is meshed with the rack to drive the rack to move, and the first upper gear is separated from the rack; the motor adopts a horizontal mode, so that the overall height can be greatly reduced, secondly, the first upper gear and the second upper gear are respectively matched with the rack to form an opening state and a closing state, and compared with the prior art, the opening state and the closing state can be realized through unidirectional rotation, so that the structure is simpler, and the use is more convenient.

Description

Technical Field

[0001] The utility model relates to the field of electrical technology, in particular to an electric operating mechanism of a circuit breaker. Background Art

[0002] Circuit breakers, specifically molded case circuit breakers, include manual operation or electric operation. In electrically operated molded case circuit breakers, since the motor is a straight-tooth transmission, the motor needs to be placed vertically to form a linkage with the gear set. The molded case circuit breaker requires a larger space to fix the motor and the gear set, resulting in an increase in the height of the entire molded case circuit breaker, making the overall volume of the molded case circuit breaker larger. This type of molded case circuit breaker cannot be used in some special occasions. Therefore, how to change the electric operating mechanism and reduce the volume of the molded case circuit breaker has become a technical problem that technicians in this field need to solve urgently. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is how to change the electric operating mechanism and reduce the volume of the molded case circuit breaker. To this end, an electric operating mechanism of a circuit breaker includes:

[0004] A motor, wherein the motor is fixed horizontally and is provided with a worm;

[0005] A gear set, one end of which cooperates with the worm, the gear set comprising a first gear assembly and a second gear assembly, the first gear assembly and the second gear assembly having opposite rotation directions, the first gear assembly comprising a first upper gear, and the second gear assembly comprising a second upper gear;

[0006] A rack, wherein the rack drives the handle to move;

[0007] In the first state, the first upper gear is engaged with the rack to drive the rack to move, and the second upper gear is separated from the rack; in the second state, the second upper gear is engaged with the rack to drive the rack to move, and the first upper gear is separated from the rack.

[0008] The first gear assembly includes a first lower gear linked to the first upper gear, the second gear assembly includes a second lower gear linked to the second upper gear, and the first lower gear is meshed with the second lower gear.

[0009] The first upper gear is provided with a first large tooth and a plurality of first small teeth, the second upper gear is provided with a second large tooth and a plurality of second small teeth, the rack is provided with a first tooth groove cooperating with the first large tooth, a second tooth groove cooperating with the second large tooth, and a plurality of third tooth grooves, and the third tooth grooves cooperate with the first small teeth and the second small teeth.

[0010] The gear set comprises a plurality of gear assemblies, one of which is provided with a one-way bearing.

[0011] Also included is a manual drive member that cooperates with one of the gear assemblies.

[0012] The manual drive member cooperates with the gear assembly provided with a one-way bearing.

[0013] It also includes a fixing frame, the fixing frame is provided with a first chamber and a second chamber, the gear set is distributed in the first chamber and the second chamber, the motor is accommodated in the first chamber, and the rack is accommodated in the second chamber.

[0014] The manual driving member extends through the second chamber to the first chamber, and the manual driving member is provided with a limiting portion, which abuts against the inner wall of the second chamber.

[0015] The first chamber is provided with a recessed portion, and the motor portion is embedded in the recessed portion.

[0016] The fixing frame includes a first fixing plate, a second fixing plate and a third fixing plate. The first fixing plate cooperates with the second fixing plate to form the first chamber, and the second fixing plate cooperates with the third fixing plate to form the second chamber.

[0017] The technical solution of the utility model has the following advantages:

[0018] 1. The utility model provides an electric operating mechanism for a circuit breaker, which adopts such a structural setting. First, the motor adopts a horizontal position, which can greatly reduce the overall height. Secondly, the first upper gear and the second upper gear cooperate with the rack to form the two states of opening and closing. Compared with the prior art, the opening and closing states can be achieved by rotating in one direction, which makes the structure simpler and more convenient to use, without considering forward and reverse rotation.

[0019] 2. The utility model provides an electric operating mechanism for a circuit breaker, wherein the first lower gear and the second lower gear are directly meshed, so that the rotation directions of the two are different, making the structure more streamlined. In addition, the transmission effect can also be formed through the remaining gear components to achieve the opposite rotation directions between the two.

[0020] 3. The utility model provides an electric operating mechanism for a circuit breaker, which adopts a large tooth structure to prevent tooth disengagement from occurring during the cooperation between the first upper gear, the second upper gear and the rack. Compared with direct cooperation through small teeth, tooth disengagement is likely to occur during excessive rotation, which will affect the rotation accuracy and cause the tripping and opening of the switch to be inadequate, or the closing of the switch to be inadequate. The large teeth can improve the accuracy and avoid the occurrence of such a phenomenon.

[0021] 4. The utility model provides an electric operating mechanism for a circuit breaker, and the setting of a one-way bearing further forms a one-way rotation effect, thereby preventing reverse operation from occurring and affecting the normal use of the motor.

[0022] 5. The utility model provides an electric operating mechanism for a circuit breaker, and the manual driving member is used for manual operation, that is, the electric operating mechanism can be electrically operated or manually operated, forming a dual-use effect.

[0023] 6. The electric operating mechanism of a circuit breaker provided by the utility model arranges the one-way bearing and the matching structure with the manual driving member in the same gear assembly, so that the structure is simpler and the operation is more convenient.

[0024] 7. The utility model provides an electric operating mechanism for a circuit breaker. The first chamber and the second chamber are arranged to form an upper and lower structure, forming a hierarchical distribution. The upper and lower gear components do not interfere with each other, thereby improving space utilization. The transmission track here forms a horizontal U-shape.

[0025] 8. The electric operating mechanism of a circuit breaker provided by the utility model has a limit part, which forms a limit fixing effect to prevent the manual drive component from being separated during use.

[0026] 9. The utility model provides an electric operating mechanism for a circuit breaker, wherein the recessed portion is provided to form a concave structure, so that the motor can be better fixed.

[0027] 10. The electric operating mechanism of a circuit breaker provided by the utility model forms two chambers by splicing three fixing plates, so that the structure is simpler and the fixing is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the structure of an electric operating mechanism of a circuit breaker provided by the utility model;

[0030] Figure 2 An exploded diagram of an electric operating mechanism of a circuit breaker provided by the utility model;

[0031] Figure 3 A bottom view of a circuit breaker provided by the utility model;

[0032] Figure 4A schematic diagram of the structure of the first state provided by the utility model;

[0033] Figure 5 A schematic diagram of the structure of the second state provided by the utility model;

[0034] Figure 6 This is a schematic structural diagram of the third gear assembly provided by the utility model.

[0035] Description of reference numerals:

[0036] 11. Motor; 12. Gear set; 13. First gear assembly; 14. Second gear assembly; 15. Rack; 16. Manual drive; 17. One-way bearing; 18. Third gear assembly; 19. Fixed frame; 111. Worm; 121. Worm wheel; 131. First upper gear; 132. First lower gear; 141. Second upper gear; 142. Second lower gear; 151. Through hole; 152. First tooth groove; 153. Second tooth groove; 154. Third tooth groove; 161. Limiting part; 181. Third upper gear; 182. Third lower gear; 191. First chamber; 192. Second chamber; 201. First fixed plate; 202. Second fixed plate; 203. Third fixed plate; 1311. First large tooth; 1312. First small tooth; 1411. Second large tooth; 1412. Second small tooth; 1911. Concave part DETAILED DESCRIPTION

[0037] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] Example 1

[0042] This embodiment provides an electric operating mechanism for a circuit breaker, as shown in the attached Figure 1-6 As shown, including:

[0043] Motor 11 is fixed horizontally, that is, motor 11 is fixed horizontally. Motor 11 is provided with a worm 111. When motor 11 is working, worm 111 moves to form a transmission effect. Here, motor 11 is specifically controlled by a controller of a circuit breaker, and can be automatically controlled by a program, or can be controlled by a button, or can be controlled by a communication method, such as 485 communication or Internet of Things or wired or wireless communication methods.

[0044] Gear set 12, gear set 12 performs transmission effect, here gear set 12 is formed by a plurality of gear components, and the transmission ratio of gear set 12 can be adjusted according to actual needs. Those skilled in the art should know how to adjust the transmission ratio, so it is not described in detail in this embodiment. One end of gear set 12 cooperates with worm 111, that is, worm 111 moves, driving gear set 12 to work, and one end of gear set 12 that cooperates with worm 111 is specifically worm wheel 121, and worm wheel 121 cooperates with worm 111 to better achieve transmission effect. At the same time, the motor 11 with worm 111 also has a unidirectional rotation structure to prevent reversal. Gear set 12 includes a first gear assembly 13 and a second gear assembly 14, and the first gear assembly 13 and the second gear assembly 14 have opposite rotation directions, and the first gear assembly 13 and the second gear assembly 14 are both parts of gear set 12, and the entire gear set 12 is set in linkage, that is, one gear assembly drives the adjacent gear assembly to move, forming an overall linkage. The first gear assembly 13 and the second gear assembly 14 can be arranged adjacent to each other or separately, and only need to ensure that the rotation directions of the two are different, that is, one rotates counterclockwise and the other rotates clockwise. The first gear assembly 13 includes a first upper gear 131, and the second gear assembly 14 includes a second upper gear 141.

[0045] The rack 15 drives the handle to move, and the rack 15 drives the handle to move, so as to achieve the opening and closing effect, that is, the rack 15 is provided with a through hole 151, and the handle extends toward the outside through the through hole 151, and the outside here can extend upward. At this time, the handle is located on the motion track of the side wall of the through hole 151, that is, when the rack 15 moves horizontally, the rack 15 will drive the handle to rotate, so as to achieve the opening and closing effect.

[0046] In the first state, the first upper gear 131 is meshed with the rack 15 to drive the rack 15 to move, and the second upper gear 141 is separated from the rack 15; in the second state, the second upper gear 141 is meshed with the rack 15 to drive the rack 15 to move, and the first upper gear 131 is separated from the rack 15. In simple terms, when the first upper gear 131 and the second upper gear 141 cooperate with the rack 15, only one of them can cooperate with the rack 15, and it is impossible to achieve that both gears cooperate with the rack 15 at the same time. The first state can be the state when the closing position moves to the opening position, and the first upper gear 131 drives the rack 15 to move horizontally to the left to achieve the opening effect. The second state is the state when the opening position moves to the closing position, and the second upper gear 141 drives the rack 15 to move horizontally to the right to achieve the closing effect. Here, the first state and the second state can also be opposite, that is, the first upper gear 131 drives the rack 15 to move to form the closing effect, and the second upper gear 141 drives the rack 15 to move to form the opening effect. It should also be noted that the first upper gear 131 and the second upper gear 141 have different rotation directions. When the first upper gear 131 rotates clockwise, the second upper gear 141 rotates counterclockwise; conversely, when the first upper gear 131 rotates counterclockwise, the second upper gear 141 rotates clockwise. The first upper gear 131 and the second upper gear 141 can only rotate in one direction and cannot rotate in the opposite direction. With this structural setting, firstly, the motor 11 adopts a horizontal lying manner, which can greatly reduce the overall height. Secondly, the first upper gear 131 and the second upper gear 141 cooperate with the rack 15 to form the two states of opening and closing. Compared with the prior art, the opening and closing states can be achieved by rotating in one direction, which makes the structure simpler and more convenient to use, without considering forward and reverse rotation.

[0047] Specifically, the first gear assembly 13 includes a first lower gear 132 linked to the first upper gear 131, the first gear assembly 13 is a double-tooth structure, the first lower gear 132 is located below the first upper gear 131, and the first lower gear 132 and the first upper gear 131 are linked. The second gear assembly 14 includes a second lower gear 142 linked to the second upper gear 141, the second gear assembly 14 is also a double-tooth structure, the second lower gear 142 is located below the second upper gear 141, and the second lower gear 142 and the second upper gear 141 are linked. The first lower gear 132 is meshed with the second lower gear 142, that is, the first lower gear 132 drives the second lower gear 142 to rotate, or the second lower gear 142 drives the first lower gear 132 to rotate. The first lower gear 132 is directly meshed with the second lower gear 142, forming a different rotation direction between the two, making the structure more streamlined. In addition, the transmission effect (i.e., indirect transmission) can also be formed through the remaining gear assemblies to achieve the opposite rotation direction between the two.

[0048] Specifically, the first upper gear 131 is provided with a first large tooth 1311 and a plurality of first small teeth 1312. The number of the first small teeth 1312 can be adjusted according to actual needs. The first small teeth 1312 can cooperate with the first large teeth 1311 to form a full tooth structure of the first upper gear 131, or a half tooth structure of the first upper gear 131. It should also be noted here that, as shown in the accompanying drawings, the size of the first large tooth 1311 is much larger than the size of the first small tooth 1312. Here, the ratio of the first large tooth 1311 to the first small tooth 1312 can be adjusted according to actual needs. The second upper gear 141 is provided with a second large tooth 1411 and a plurality of second small teeth 1412. The number of the second small teeth 1412 can be adjusted according to actual needs. The second small teeth 1412 can cooperate with the second large teeth 1411 to form a full tooth structure of the first upper gear 131, or a half tooth structure of the second upper gear 141. It should also be noted that, as shown in the accompanying drawings, the size of the second large tooth 1411 is much larger than the size of the second small tooth 1412. Here, the ratio of the second large tooth 1411 to the second small tooth 1412 can be adjusted according to actual needs. In this embodiment, the first upper gear 131 and the second upper gear 141 have the same structure, and the difference is that the positional relationship between the first large tooth 1311 and the second large tooth 1411 is different. Those skilled in the art can adjust the positional relationship between the first upper gear 131 and the second upper gear 141 according to the coordination with the rack 15. The rack 15 is provided with a first tooth groove 152 coordinated with the first large tooth 1311, a second tooth groove 153 coordinated with the second large tooth 1411, and a plurality of third tooth grooves 154, and the third tooth groove 154 is coordinated with the first small tooth 1312 and the second small tooth 1412. The large tooth structure is adopted so that the first upper gear 131, the second upper gear 141 and the rack 15 are not prone to tooth disengagement during the process of cooperation. Compared with the direct cooperation through the small teeth, when the rotation is excessive, the tooth disengagement is easy to occur, which will affect the rotation accuracy, thereby causing the tripping and opening of the switch to be not in place, or the closing of the switch to be not in place. The large teeth can improve the accuracy and avoid the occurrence of such phenomena. For example, when the first large tooth 1311 cooperates with the first tooth groove 152, a meshing effect is formed, driving the rack 15 to move, and the first small tooth 1312 is meshed with the third tooth groove 154, forming an effect of driving the rack 15 together; conversely, when the second large tooth 1411 cooperates with the second tooth groove 153, a meshing effect is formed, driving the rack 15 to move, and the second small tooth 1412 is meshed with the third tooth groove 154, forming an effect of driving the rack 15 together. The positional relationship between the first tooth groove 152, the second tooth groove 153, and the third tooth groove 154 is related to the first gear assembly 13 and the second gear assembly 14. In this embodiment, the first tooth groove 152 and the second tooth groove 153 are disposed adjacent to each other and are located in the middle area of ​​the rack 15 . The third tooth groove 154 is disposed on both sides of the first tooth groove 152 and the second tooth groove 153 .In addition, those skilled in the art can also adjust the positional relationship among them according to actual needs.

[0049] Specifically, the gear set 12 includes a plurality of gear assemblies, one of which is provided with a one-way bearing 17. The one-way bearing 17 is provided to further form a one-way rotation effect, thereby preventing reverse operation from occurring and affecting the normal use of the motor 11. The one-way bearing 17 here can be a needle roller bearing, a roller bearing, or a ball bearing.

[0050] Specifically, it also includes a manual drive member 16, which cooperates with one of the gear assemblies. The manual drive member 16 is used for manual operation, that is, the electric operating mechanism can be electrically operated or manually operated, forming a dual-use effect.

[0051] Specifically, the manual drive member 16 cooperates with a gear assembly provided with a one-way bearing 17. The one-way bearing 17 and the cooperation structure with the manual drive member 16 are arranged in the same gear assembly, so that the structure is simpler and the operation is more convenient. In this embodiment, for better description, the gear assembly provided with the one-way bearing 17 is specifically a third gear assembly 18, and the third gear assembly 18 also cooperates with the manual drive member 16 to form a manual operation effect.

[0052] Specifically, it also includes a fixing frame 19, which is provided with a first chamber 191 and a second chamber 192. The first chamber 191 and the second chamber 192 are distributed up and down, the first chamber 191 is located at the bottom, and the second chamber 192 is located at the top. The motor 11 is accommodated in the first chamber 191, and the motor 11 is specifically installed and fixed in a horizontal position. The gear set 12 is distributed in the first chamber 191 and the second chamber 192. It should be noted that the third gear assembly 18 includes a third upper gear 181 and a third lower gear 182. The third lower gear 182 and the third upper gear 181 are arranged in linkage. The third upper gear 181 is located in the second chamber 192, and the third lower gear 182 is located in the first chamber 191, forming a gear linkage between the first chamber 191 and the second chamber 192. Here, the one-way bearing 17 is specifically installed on the third lower gear 182. The rack 15 is accommodated in the second chamber 192. The arrangement of the first chamber 191 and the second chamber 192 forms an upper and lower structure, forming a hierarchical distribution, and the upper and lower gear assemblies do not interfere with each other, thereby improving space utilization. The transmission track here forms a horizontal U-shape, that is, the motor 11 is located on the far left, transmitted to the far right through the gear assembly, and then upward through the third upper gear 181 to cooperate with the gear assembly in the second chamber 192 until it is transmitted to the rack 15. In this embodiment, the second gear assembly 14 is located at the end of the entire gear set 12, and the first gear assembly 13 and the second gear assembly 14 are arranged adjacent to each other.

[0053] Specifically, the manual drive member 16 extends through the second chamber 192 to the first chamber 191, and the manual drive member 16 is provided with a limit portion 161, which abuts against the inner wall of the second chamber 192. The setting of the limit portion 161 forms a limit fixing effect to prevent the manual drive member 16 from being separated during use. Here, the limit portion 161 specifically abuts against the upper inner wall of the second chamber 192. When electrically driven, the manual drive member 16 also rotates with the gear set 12, and there is a linkage effect between the several.

[0054] Specifically, the first chamber 191 is provided with a recessed portion 1911, which is located at the bottom surface of the first chamber 191. The recessed portion 1911 is recessed downward, and the motor 11 is partially embedded in the recessed portion 1911. The recessed portion 1911 is provided to form a concave structure, so that the motor 11 can be better fixed.

[0055] Specifically, the fixing frame 19 includes a first fixing plate 201, a second fixing plate 202 and a third fixing plate 203. The first fixing plate 201, the second fixing plate 202 and the third fixing plate 203 are arranged parallel to each other, the first fixing plate 201 is located at the bottom, the second fixing plate 202 is located in the middle, and the third fixing plate 203 is located at the top. The first fixing plate 201 and the second fixing plate 202 cooperate to form a first chamber 191, and the recessed portion 1911 is located at the first fixing plate 201. The second fixing plate 202 and the third fixing plate 203 cooperate to form a second chamber 192. The two chambers are formed by splicing three fixing plates, which makes the structure simpler and more convenient to fix. It should also be noted here that the handle can extend into the second chamber 192 through the first fixing plate 201 and the second fixing plate 202, that is, the first fixing plate 201 and the second fixing plate 202 are provided with holes for the handle to pass through. In addition, those skilled in the art can also form the fixing effect between the motor 11, the gear set 12, and the rack 15 in other ways.

[0056] Specifically, the motor 11 is a DC motor 11, and its power supply voltage is 12V. Compared with the 24V power supply method in the prior art, the 12V power supply can be directly powered by the control module of the circuit breaker, which is more convenient to operate and does not require voltage conversion.

[0057] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. An electric operating mechanism of a circuit breaker, characterized in that: include: A motor (11), wherein the motor (11) is fixed horizontally and is provided with a worm (111); a gear set (12), one end of the gear set (12) being matched with the worm (111), the gear set (12) comprising a first gear assembly (13) and a second gear assembly (14), the first gear assembly (13) and the second gear assembly (14) having opposite rotation directions, the first gear assembly (13) comprising a first upper gear (131), and the second gear assembly (14) comprising a second upper gear (141); A rack (15), wherein the rack (15) drives the handle to move; In a first state, the first upper gear (131) is meshed with the rack (15) to drive the rack (15) to move, and the second upper gear (141) is separated from the rack (15); in a second state, the second upper gear (141) is meshed with the rack (15) to drive the rack (15) to move, and the first upper gear (131) is separated from the rack (15).

2. The electric operating mechanism of the circuit breaker according to claim 1, characterized in that: The first gear assembly (13) comprises a first lower gear (132) linked to the first upper gear (131), the second gear assembly (14) comprises a second lower gear (142) linked to the second upper gear (141), and the first lower gear (132) is meshed with the second lower gear (142).

3. The electric operating mechanism of the circuit breaker according to claim 1 or 2, characterized in that: The first upper gear (131) is provided with a first large tooth (1311) and a plurality of first small teeth (1312); the second upper gear (141) is provided with a second large tooth (1411) and a plurality of second small teeth (1412); the rack (15) is provided with a first tooth groove (152) matched with the first large tooth (1311), a second tooth groove (153) matched with the second large tooth (1411), and a plurality of third tooth grooves (154); the third tooth groove (154) is matched with the first small tooth (1312) and the second small tooth (1412).

4. The electric operating mechanism of the circuit breaker according to claim 1, characterized in that: The gear set (12) comprises a plurality of gear assemblies, one of which is provided with a one-way bearing (17).

5. The electric operating mechanism of the circuit breaker according to claim 4, characterized in that: Also included is a manual drive member (16) which cooperates with one of the gear assemblies.

6. The electric operating mechanism of the circuit breaker according to claim 5, characterized in that: The manual drive member (16) cooperates with the gear assembly provided with a one-way bearing (17).

7. The electric operating mechanism of the circuit breaker according to claim 5 or 6, characterized in that: The invention also comprises a fixing frame (19), wherein the fixing frame (19) is provided with a first chamber (191) and a second chamber (192), the gear set (12) is distributed in the first chamber (191) and the second chamber (192), the motor (11) is accommodated in the first chamber (191), and the rack (15) is accommodated in the second chamber (192).

8. The electric operating mechanism of the circuit breaker according to claim 7, characterized in that: The manual driving member (16) passes through the second chamber (192) and extends to the first chamber (191). The manual driving member (16) is provided with a limiting portion (161), and the limiting portion (161) abuts against an inner wall of the second chamber (192).

9. The electric operating mechanism of the circuit breaker according to claim 7, characterized in that: The first chamber (191) is provided with a recessed portion (1911), and the motor (11) is partially embedded in the recessed portion (1911).

10. The electric operating mechanism of the circuit breaker according to claim 7, characterized in that: The fixing frame (19) comprises a first fixing plate (201), a second fixing plate (202) and a third fixing plate (203); the first fixing plate (201) and the second fixing plate (202) cooperate to form the first chamber (191); the second fixing plate (202) and the third fixing plate (203) cooperate to form the second chamber (192).

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