Self-locking device of circuit breaker operating mechanism

Abstract

A self-locking device of a circuit breaker operating mechanism is characterized in that a handle lever assembly is provided with a first self-locking feature part, a lock catch is provided with a second self-locking feature part at the position corresponding to the first self-locking feature part, when the operating mechanism is located at the closing or releasing position, the first self-locking feature part and the second self-locking feature part are separated, and the first self-locking feature part and the second self-locking feature part are separated. And when the operating mechanism is in an opening position, the self-locking characteristic part I and the self-locking characteristic part II are contacted to realize self-locking. The operating mechanism performs self-locking through the characteristics of the handle lever assembly and the characteristics of the lock catch, and during opening, the draw bar rotates and the mechanism does not release. The whole self-locking device is simple in structure, the operation mechanism can be unlocked in an opening state without adding other transmission parts, the circuit breaker is still in a hasp state, and tripping does not occur. And meanwhile, the aim of not influencing the normal work of the device when the device is in other states is fulfilled.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers, and specifically relates to a self-locking device of a circuit breaker operating mechanism. Background Art

[0002] Circuit breakers are an important part of power distribution equipment, mainly used in industrial low-voltage power systems to connect and disconnect currents in power grid circuits and protect lines and power equipment from overload, undervoltage, short circuit, single-phase grounding and other faults. The circuit breaker's function of disconnecting overload or short-circuit currents is mainly accomplished through the arc extinguishing chamber installed in the circuit breaker.

[0003] In the prior art, before the generator stops, the electric operating mechanism issues a tripping command to trip the circuit breaker (disconnect the load), the generator stops, the undervoltage release loses power, and the traction rod of the operating mechanism is unlocked. On the other hand, when the circuit breaker is in the tripped state, the tripping button must be pressed first, and the closing button can be pressed after the circuit breaker is opened to achieve closing. The closing operation of the existing system is complicated and time-consuming. Therefore, in these specific occasions, the operating mechanism must not be unlocked in the circuit breaker in the open state and when the undervoltage release loses power or is undervoltage to ensure the safe operation of the circuit breaker.

[0004] Chinese patent CN116313667A discloses a locking structure of a circuit breaker operating mechanism, wherein the operating mechanism includes a bracket, a handle lever assembly, a lock assembly, and a connecting rod mechanism; the handle lever assembly and the lock assembly are rotatably arranged on the bracket, the lock assembly and the connecting rod mechanism are buckled to lock or unlock the connecting rod mechanism, and the handle lever assembly drives the connecting rod mechanism to move to realize the closing and opening of the circuit breaker, and the characteristics are: the operating mechanism also includes a transmission mechanism, the transmission mechanism is driven by the handle lever assembly and switches between the first and second positions, when the handle lever assembly is in the closing or tripping position, the transmission mechanism is in the first position, the transmission mechanism and the lock assembly are separated, and the operating mechanism can be tripped; when the handle lever assembly is in the opening position, the transmission mechanism is in the second position, the transmission mechanism acts on the lock assembly to keep it in the locked position, and the operating mechanism cannot be tripped. The locking structure reduces the complexity of the operation, and the operating mechanism is unlocked when the opening state is realized, and the circuit breaker is still in the buckled state and does not trip. However, the locking structure is complex, and multiple transmission parts need to cooperate to realize this function, and the reliability is insufficient. Utility Model Content

[0005] The purpose of the utility model is to provide a self-locking device for a circuit breaker operating mechanism in view of the defects that the locking structure of the existing circuit breaker operating mechanism is complex and multiple transmission parts need to cooperate to realize the locking function. The self-locking device has a simple structure and is easy to operate, so that when the circuit breaker is in the open state, the mechanism traction rod is unlocked without causing the mechanism to trip.

[0006] Technical Solution

[0007] In order to achieve the above technical objectives, the utility model provides a self-locking device for a circuit breaker operating mechanism, the operating mechanism comprising a bracket, a handle lever assembly, a lock, a trip buckle and a connecting rod mechanism, the handle lever assembly and the lock buckle, the trip buckle are rotatably installed on the bracket, the handle lever assembly rotates to drive the connecting rod mechanism to realize the on and off of the contact system and thus realize the closing and opening of the circuit breaker, the lock buckle and the trip buckle cooperate to lock or unlock the connecting rod mechanism, characterized in that: a self-locking feature part 1 is provided on the handle lever assembly, and a self-locking feature part 2 is provided on the lock buckle at a position corresponding to the self-locking feature part 1, when the operating mechanism is in the closing or tripping position, the self-locking feature part 1 and the self-locking feature part 2 are separated; when the operating mechanism is in the opening position, the self-locking feature part 1 and the self-locking feature part 2 are in contact to realize self-locking, and the operating mechanism cannot be tripped.

[0008] In one embodiment, the handle lever assembly includes a handle and a lever, wherein the lever and the handle are fixed together, and the self-locking feature is arranged on the handle or the lever.

[0009] In one embodiment, the self-locking feature is a protrusion on the handle or lever, and a self-locking surface is provided on the protrusion.

[0010] Furthermore, the first self-locking surface is an inclined surface.

[0011] In one embodiment, the lock buckle is rotatably mounted on the bracket via a mounting shaft, and the second self-locking feature portion is a bent portion on the lock buckle, and a second self-locking surface corresponding to the first self-locking surface is provided on the bent portion.

[0012] Furthermore, the second self-locking surface is an inclined surface.

[0013] In one embodiment, the lock buckle is provided with a linkage part 1 and a linkage part 2 which are linked with the jump buckle;

[0014] The jump buckle is rotatably mounted on the bracket via a rotating shaft, and the jump buckle is provided with a raised angle and an arch corresponding to the linkage part 1 and the linkage part 2 on the lock buckle respectively.

[0015] In one of the embodiments, the lock buckle is provided with a linkage part three that is linked with the re-lock, the re-lock 7 is rotatably mounted on the bracket, and the re-lock is provided with a linkage boss that is linked with the lock buckle.

[0016] In one embodiment, the connecting rod mechanism includes an upper connecting rod and a lower connecting rod, and the corresponding ends of the upper connecting rod and the lower connecting rod are pivotally connected through a connecting shaft. The other end of the upper connecting rod is pivotally mounted on a raised shaft on the jump buckle, and the other end of the lower connecting rod is connected to the moving contact system. One end of the main spring is mounted on the lever of the handle lever assembly, and the other end is mounted on the connecting shaft.

[0017] In one embodiment, a groove 1 is provided at the bottom of the lever, the bracket includes a pair of side plates, and the lever is mounted on a groove 2 on the outer side of the pair of side plates through the groove 1 at the bottom.

[0018] Beneficial Effects

[0019] The utility model provides a self-locking device for a circuit breaker operating mechanism, the operating mechanism includes a bracket, a handle lever assembly, a lock, a trip buckle and a connecting rod mechanism, the handle lever assembly and the lock buckle and the trip buckle are rotatably mounted on the bracket, the handle lever assembly rotates to drive the connecting rod mechanism to realize the on and off of the contact system, thereby realizing the closing and opening of the circuit breaker, the lock buckle and the trip buckle cooperate to lock or unlock the connecting rod mechanism, the handle lever assembly is provided with a self-locking feature part 1, and the lock buckle is provided with a self-locking feature part 2 at a position corresponding to the self-locking feature part 1, when the operating mechanism is in the closing or tripping position, the self-locking feature part 1 and the self-locking feature part 2 are separated; when the operating mechanism is in the opening position, the self-locking feature part 1 and the self-locking feature part 2 are in contact to realize self-locking, and the operating mechanism cannot be tripped. The operating mechanism is self-locked by the features on the handle lever assembly and the features on the lock buckle, and when the circuit breaker is opened, the traction rod rotates and the mechanism does not trip. The entire self-locking device has a simple structure and can unlock the operating mechanism in the open state without adding other transmission parts. The circuit breaker is still in the buckled state and does not trip. At the same time, it meets the purpose of not affecting its normal work when it is in other states. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Attached Figure 1 It is a circuit breaker product in the embodiment of the utility model Figure 1 .

[0022] Attached Figure 2 It is a schematic diagram of a circuit breaker in an open state in an embodiment of the utility model.

[0023] Attached Figure 3It is a schematic diagram of a circuit breaker in a closed state in an embodiment of the utility model.

[0024] Attached Figure 4 It is a schematic diagram of a circuit breaker in a tripping position in an embodiment of the utility model.

[0025] Attached Figure 5 It is a schematic diagram of a circuit breaker in an embodiment of the utility model in a re-clamping limit position.

[0026] Attached Figure 6 It is a structural schematic diagram of the handle lever assembly in the embodiment of the utility model.

[0027] Attached Figure 7a It is a schematic diagram of the structure of the lock in the embodiment of the utility model.

[0028] Attached Figure 7b It is a front view of the lock in the embodiment of the utility model.

[0029] Attached Figure 7c It is a right side view of the lock buckle in the embodiment of the utility model.

[0030] Attached Figure 8 It is a structural schematic diagram of a jump button in an embodiment of the utility model. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying 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 the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0036] Example

[0037] In the prior art, before the generator stops, the electric operating mechanism sends out an opening command to open the circuit breaker (disconnect the load), the generator stops, the undervoltage release loses power, and the traction rod of the operating mechanism is unlocked. On the other hand, when the circuit breaker is in the tripped state, the opening button must be pressed first, and only after the circuit breaker is opened can the closing button be pressed to close the circuit. The closing operation of the existing system is complicated and time-consuming. Therefore, in these specific occasions, the operating mechanism must not be unlocked when the circuit breaker is in the open state and when the undervoltage release loses power or is undervoltage in order to ensure the safe operation of the circuit breaker. However, the locking structure of the existing circuit breaker operating mechanism is complex, and the locking function requires the cooperation of multiple transmission parts, which is not reliable enough. In order to solve this problem, as shown in the attached figure, Figure 1 , 2, 4 and 5, this embodiment provides a self-locking device for a circuit breaker operating mechanism, the operating mechanism includes a bracket 1, a handle lever assembly 2, a lock 3, a trip buckle 4 and a connecting rod mechanism 5, the handle lever assembly 2 and the lock 3, the trip buckle 4 are rotatably mounted on the bracket 1, the handle lever assembly 2 rotates to drive the connecting rod mechanism 5 to realize the on and off of the contact system and thus realize the closing and opening of the circuit breaker, the lock 3 and the trip buckle 4 cooperate to lock or unlock the connecting rod mechanism 5. Among them, as shown in the attached Figure 7a , 7b, 7c, the lock buckle 3 is provided with a linkage part 1 302 and a linkage part 2 304 that are linked with the jump buckle 4. The lock buckle 3 is provided with a linkage part 303 that is linked with the linkage boss 701 of the re-buckle 7. The re-buckle 7 is rotatably mounted on the bracket 1, and the re-buckle 7 is provided with a linkage boss 701 that is linked with the linkage part 303 of the lock buckle 3. The jump buckle 4 is rotatably mounted on the bracket 1 through the rotating shaft 8, and the jump buckle 4 is provided with a raised angle 401 and an arch 403 that correspond to the linkage part 1 302 and the linkage part 2 304 on the lock buckle 3, respectively. The connecting rod mechanism 5 includes an upper connecting rod 5a and a lower connecting rod 5b, and the corresponding ends of the upper connecting rod 5a and the lower connecting rod 5b are pivotally connected through a connecting shaft 9, and the other end of the upper connecting rod 5a is pivotally mounted on the protruding shaft 402 on the jumper 4, and the other end of the lower connecting rod 5b is mounted on the rotating shaft 11 to drive the moving contact system 10 to move. One end of the main spring (not shown in the drawings) is mounted on the lever 2b on the handle lever assembly 2, and the other end is mounted on the connecting shaft 9. A groove 2b01 is set at the bottom of the lever 2b, and the bracket 1 includes a pair of side plates, and the lever 2b is mounted on the groove 2 101 on the outer side of the pair of side plates through the groove 2b01 at the bottom.

[0038] Among them, as attached Figure 6 As shown, the handle lever assembly 2 is provided with a self-locking feature part 1 201, and the lock buckle 3 is provided with a self-locking feature part 2 301 at a position corresponding to the self-locking feature part 1 201. When the operating mechanism is in the closing or tripping position, the self-locking feature part 1 201 and the self-locking feature part 2 301 are separated. When the operating mechanism is in the opening position, the self-locking feature part 1 201 and the self-locking feature part 2 301 are in contact to achieve self-locking, and the operating mechanism cannot be tripped.

[0039] Specifically, as shown in the attached Figure 6 As shown, the handle lever assembly 2 includes a handle 2a and a lever 2b, and the lever 2b and the handle 2a are fixed together, and the self-locking feature part 1 201 is arranged on the handle 2a or the lever 2b. The self-locking feature part 1 201 is a raised block on the handle 2a or the lever 2b, and the raised block is provided with a self-locking surface 1 201a. In this embodiment, the self-locking feature part 1 201 is arranged on the handle, and the self-locking surface 1 201a is preferably an inclined surface. The lock buckle 3 is rotatably mounted on the bracket 1 through the mounting shaft 6, and the self-locking feature part 2 301 is a bent portion on the lock buckle 3, and the bent portion is provided with a self-locking surface 2 301a corresponding to the self-locking surface 1 201a, and the self-locking surface 2 301a is preferably an inclined surface.

[0040] As attached Figure 2As shown, when the operating mechanism of the circuit breaker is in the open state, the handle lever assembly 2 is in the open state, and the self-locking feature part 1 201 on the handle 2a contacts the self-locking feature part 2 301 on the lock buckle 3 to achieve self-locking. At this time, even if the traction rod (not shown in the drawings) is unlocked and rotated counterclockwise, since the buckle 7 is fixed on the traction rod and rotates with the traction rod, the linkage boss 701 of the buckle 7 leaves the surface of the lock buckle 3 counterclockwise and enters the linkage part 3 303. However, since the self-locking feature part 1 201 on the handle 2a hinders the rotation of the lock buckle 3, the lock buckle is not unlocked and tripped at this time, and the operating mechanism cannot be disengaged.

[0041] As attached Figure 3 As shown, when the operating mechanism of the circuit breaker is in the closed state, the handle lever assembly 2 is in the closed state, at this time, the self-locking feature part 1 201 on the handle 2a and the self-locking feature part 2 301 on the lock buckle 3 are in a separated state. At this time, if the traction rod (not shown in the figure) is unlocked and rotated counterclockwise, the linkage boss 701 of the lock buckle 7 will rotate counterclockwise and enter the hole at the linkage part 3 303 of the lock buckle 3. At this time, the lock buckle 3 can rotate clockwise to unlock the trip buckle 4, and the operating mechanism is free to trip.

[0042] As attached Figure 4 As shown, when the operating mechanism of the circuit breaker is in the tripping position, the linkage boss 701 of the lock 7 is in the hole at the linkage part 303 of the lock 3.

[0043] As attached Figure 5 As shown, when the operating mechanism of the circuit breaker is in the re-locking limit position, the self-locking feature part 1 201 on the handle 2a is separated from the self-locking feature part 2 301 on the lock buckle 3. At this time, the protruding corner 401 of the jump buckle 4 presses the linkage part 1 302 of the lock buckle 3, so that the lock buckle 3 is normally flipped counterclockwise, so that the linkage boss 701 of the re-lock 7 is separated from the linkage part 303 of the lock buckle 3, and the re-lock 7 is flipped clockwise to the re-locking position under the action of the torsion spring. At this time, the self-locking feature part 1 201 on the handle 2a does not affect the re-locking process of the mechanism. When no operating force is applied to the handle 2a, the jump buckle 4 rotates counterclockwise, so that the arch 403 presses against the linkage part 2 304, and the operating mechanism can be re-locked normally.

[0044] The utility model provides a self-locking device for a circuit breaker operating mechanism. The operating mechanism is self-locked through the features on the handle lever assembly and the features on the lock. When the switch is opened, the traction rod rotates and the mechanism does not trip. The entire self-locking device has a simple structure and can unlock the operating mechanism in the open state without adding other transmission parts. The circuit breaker is still in the buckled state and does not trip. At the same time, it meets the purpose of not affecting its normal work when it is in other states.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A self-locking device for a circuit breaker operating mechanism, the operating mechanism comprising a bracket (1), a handle lever assembly (2), a lock catch (3), a trip catch (4) and a connecting rod mechanism (5), the handle lever assembly (2), the lock catch (3) and the trip catch (4) being rotatably mounted on the bracket (1), the handle lever assembly (2) rotating to drive the connecting rod mechanism (5) to move to realize the switching of a contact system and thus realize the closing and opening of the circuit breaker, the lock catch (3) and the trip catch (4) cooperating to lock or unlock the connecting rod mechanism (5), characterized in that: The handle lever assembly (2) is provided with a self-locking feature part 1 (201), and the lock buckle (3) is provided with a self-locking feature part 2 (301) at a position corresponding to the self-locking feature part 1 (201). When the operating mechanism is in the closing or tripping position, the self-locking feature part 1 (201) and the self-locking feature part 2 (301) are separated; when the operating mechanism is in the opening position, the self-locking feature part 1 (201) and the self-locking feature part 2 (301) are in contact to achieve self-locking, and the operating mechanism cannot be tripped.

2. A self-locking device for a circuit breaker operating mechanism according to claim 1, characterized in that: The handle lever assembly (2) comprises a handle (2a) and a lever (2b), wherein the lever (2b) and the handle (2a) are fixed together, and the self-locking feature part (201) is arranged on the handle (2a) or the lever (2b).

3. A self-locking device for a circuit breaker operating mechanism as claimed in claim 2, characterized in that: The self-locking feature part one (201) is a raised block on the handle (2a) or the lever (2b), and the raised block is provided with a self-locking surface one (201a).

4. A self-locking device for a circuit breaker operating mechanism as claimed in claim 3, characterized in that: The self-locking surface 1 (201a) is an inclined surface.

5. A self-locking device for a circuit breaker operating mechanism as claimed in claim 3, characterized in that: The lock buckle (3) is rotatably mounted on the bracket (1) via a mounting shaft (6); the second self-locking feature portion (301) is a bent portion on the lock buckle (3); and the bent portion is provided with a second self-locking surface (301a) corresponding to the first self-locking surface (201a).

6. A self-locking device for a circuit breaker operating mechanism as claimed in claim 5, characterized in that: The second self-locking surface (301a) is an inclined surface.

7. A self-locking device for a circuit breaker operating mechanism according to claim 1, characterized in that: The lock buckle (3) is provided with a linkage part 1 (302) and a linkage part 2 (304) which are linked with the jump buckle (4); The jump buckle (4) is rotatably mounted on the bracket (1) via a rotating shaft (8), and the jump buckle (4) is provided with a raised angle (401) and an arch (403) respectively corresponding to the linkage part 1 (302) and the linkage part 2 (304) on the lock buckle (3).

8. A self-locking device for a circuit breaker operating mechanism according to claim 1, characterized in that: The lock buckle (3) is provided with a linkage part 3 (303) that is linked with the re-lock (7); The re-lock (7) is rotatably mounted on the bracket (1), and a linkage boss (701) is provided on the re-lock (7) and is linked to the lock buckle (3).

9. A self-locking device for a circuit breaker operating mechanism according to claim 1, characterized in that: The connecting rod mechanism (5) comprises an upper connecting rod (5a) and a lower connecting rod (5b), wherein the corresponding ends of the upper connecting rod (5a) and the lower connecting rod (5b) are pivotally connected via a connecting shaft (9), the other end of the upper connecting rod (5a) is pivotally mounted on a raised shaft (402) on the jumper (4), the other end of the lower connecting rod (5b) is connected to a moving contact system (10), one end of a main spring is mounted on a lever (2b) of a handle lever assembly (2), and the other end is mounted on the connecting shaft (9).

10. A self-locking device for a circuit breaker operating mechanism as claimed in claim 2, characterized in that: A groove 1 (2b01) is provided at the bottom of the lever (2b); the bracket (1) comprises a pair of side plates; the lever (2b) is mounted on a groove 2 (101) on the outer sides of the pair of side plates via the groove 1 (2b01) at the bottom.

Images