An operating mechanism for a circuit breaker

Abstract

An operating mechanism of a circuit breaker belongs to the technical field of low-voltage electrical appliances. It includes a pair of side plates arranged face to face, a cam assembly and an energy storage lever assembly that are both rotatably arranged between the pair of side plates, a spring assembly located between the pair of side plates, the cam assembly including a cam plate group and a camshaft, the camshaft is rotatably arranged between the pair of side plates, and the cam plate group is fixed on the camshaft. The characteristics are: the cam assembly also includes a collision member, and the collision member rotates synchronously with the cam plate group; the energy storage lever assembly is provided with a collision member, and during the energy release process, the spring assembly causes the cam assembly to rotate and causes the energy storage lever assembly to rotate; after the cam assembly rotates, the collision member rotates and hits the collision member, and the collision member applies a torque to the collision member that is consistent with the rotation direction of the energy storage lever assembly during the closing process. Advantages: It effectively prevents the cam assembly from over-rotating, and can transfer the energy of the cam assembly rotation to the energy storage lever assembly, thereby improving the energy utilization rate of the operating mechanism.

Description

Technical Field

[0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to an operating mechanism of a circuit breaker. Background Art

[0002] Universal circuit breakers are widely used in low-voltage power supply and distribution systems due to their excellent protection characteristics. The circuit breaker includes an operating mechanism, which is used to perform the closing and opening operations of the circuit breaker and is the core component of the circuit breaker. The energy storage system is an important part of the operating mechanism. When storing energy, the camshaft drives the cam to rotate, and the cam drives the energy storage lever to compress the energy storage spring to achieve energy storage.

[0003] The operating mechanism includes a spring assembly, an energy storage lever assembly, a connecting rod assembly and a cam assembly. When the operating mechanism releases energy to perform a closing action, the cam assembly is first unlocked, and the cam assembly unlocks the energy storage lever assembly. When the energy storage lever assembly is unlocked, the spring assembly pushes the energy storage lever assembly to move, and the energy storage lever assembly drives the connecting rod assembly to move. After the connecting rod assembly moves, it drives the rotating shaft of the operating mechanism to move, and after the rotating shaft moves, it drives the contact system to close the switch.

[0004] As the performance of circuit breakers improves, the energy storage spring force of the operating mechanism continues to increase. In order to improve the efficiency of the energy storage system, bearings are often set at both ends of the camshaft in the cam assembly to reduce the rotational resistance of the cam in the cam assembly. However, with the increase in spring reaction force and the decrease in rotational resistance, when the mechanism is releasing energy, the cam itself will rotate too much due to the reaction force and hit the energy storage lever assembly, resulting in a vicious collision. A vicious collision can cause damage to the mechanism or failure of the circuit breaker to close properly. Specifically, Fig. 9 After the cam assembly 1 rotates excessively, the outer edge of the first cam piece 11 on it will collide with the fixed shaft 24 on the energy storage lever assembly 2. As a result, both are damaged. At the same time, the first cam piece 11 generates a torque on the fixed shaft 24, which reduces the energy of the swing of the energy storage lever assembly 2.

[0005] In view of the above-mentioned prior art, it is necessary to reasonably improve the operating mechanism of the existing circuit breaker. To this end, the applicant has made a useful design, and the technical solution to be introduced below is produced under this background. Summary of the invention

[0006] The task of the present invention is to provide an operating mechanism of a circuit breaker, which can effectively prevent the cam assembly from a vicious collision and can transfer the energy of the cam assembly's rotation to the energy storage lever assembly, thereby improving the energy utilization rate of the operating mechanism.

[0007] The task of the present invention is accomplished in this way: an operating mechanism of a circuit breaker includes a pair of side plates arranged face to face, a cam assembly and an energy storage lever assembly that are both rotatably arranged between the pair of side plates, and a spring assembly located between the pair of side plates, wherein the cam assembly includes a cam plate group and a cam shaft, wherein the cam shaft is rotatably arranged between the pair of side plates, the cam plate group is fixed on the cam shaft, and the cam assembly also includes a collision member, which rotates synchronously with the cam plate group; a collision member is provided on the energy storage lever assembly, and during the energy release process, the force of the spring assembly causes the cam assembly to rotate and the energy storage lever assembly to rotate; after the cam assembly rotates, the collision member rotates and hits the collision member, and the collision member applies a torque to the collision member that is consistent with the rotation direction of the energy storage lever assembly.

[0008] In a specific embodiment of the present invention, the collision member is in the shape of a sheet, and the collision-receiving member is in the shape of a shaft.

[0009] In a specific embodiment of the present invention, at the moment when the collision member hits the impacted member, the direction of the force exerted by the collision member on the impacted member is tangent to the rotation direction of the impacted member.

[0010] In another specific embodiment of the present invention, the collision part includes a mounting hole, a positioning shaft hole and a positioning shaft, and an impact surface is also provided on the outer edge surface of the collision part. The mounting hole is used for the camshaft to pass through, the positioning shaft passes through the positioning shaft hole, both ends of the positioning shaft are connected to the cam plate group, and the impact surface is used to collide with the impacted part.

[0011] In another specific embodiment of the present invention, the cam piece group includes a first cam piece and a second cam piece; the first cam piece and the second cam piece are both fixedly mounted on the cam shaft, the first cam piece consists of two pieces and are arranged at an interval, and the two ends of the positioning shaft are respectively connected to the two first cam pieces on both sides.

[0012] In another specific embodiment of the present invention, the energy storage lever assembly includes a pair of lever plates and a rotating shaft arranged at intervals, a fixed shaft is provided between the pair of lever plates, and a first rotating hole is provided on each of the pair of lever plates. After the rotating shaft passes through the first rotating hole, both ends are respectively arranged on a pair of side plates, and the energy storage lever assembly swings around the rotating shaft; the impact part is fixed between the pair of lever plates.

[0013] In another specific embodiment of the present invention, a spring matching shaft is provided on one swinging end of the pair of lever sheets, and during the energy release process of the operating mechanism, the spring assembly drives the spring matching shaft to swing; a pushing shaft is provided on the other swinging end of the pair of lever sheets, and during the energy release process of the operating mechanism, the pushing shaft drives the cam assembly to rotate.

[0014] In a further specific embodiment of the present invention, the pushing shafts are a pair, which are respectively located on the opposite outer sides of the pair of lever sheets and are symmetrically arranged.

[0015] In a further specific embodiment of the present invention, limiting sleeves are respectively sleeved on the shaft sections of the camshaft located between the collision member and the first cam pieces on both sides.

[0016] In yet another specific embodiment of the present invention, the impact surface is a curved surface.

[0017] Due to the adoption of the above structure, the present invention has the following beneficial effects: during the energy release process of the operating mechanism, the collision part in the cam assembly collides with the collision-receiving part in the energy storage lever assembly, and the collision plays two roles: first, the kinetic energy of the cam assembly is released, effectively preventing the cam assembly from having a vicious collision, thus playing a buffering role; second, the rotational energy of the cam assembly is transferred to the energy storage lever assembly, and the rotational energy of the energy storage lever assembly during the closing process is strengthened once, thereby improving the energy utilization rate of the operating mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic diagram of an internal state of the operating mechanism of the present invention.

[0019] Figure 2 The figure is a schematic diagram of another internal state of the operating mechanism of the present invention.

[0020] Figure 3 It is a structural schematic diagram of the energy storage lever assembly of the present invention.

[0021] Figure 4 It is a schematic diagram of the exploded view of the cam assembly of the present invention.

[0022] Figure 5 It is a schematic diagram of the brake pad in the cam assembly of the present invention.

[0023] Figure 6 It is a schematic diagram of a state in which the cam assembly and the energy storage lever assembly described in the present invention cooperate with each other.

[0024] Figure 7 It is a schematic diagram of another state of the cam assembly and the energy storage lever assembly of the present invention.

[0025] Figure 8 It is a schematic diagram of another state of the cam assembly and the energy storage lever assembly of the present invention.

[0026] Fig. 9 It is a schematic diagram of a vicious collision between a cam assembly and an energy storage lever assembly in the prior art.

[0027] In the figure: 100. side plate, 101. limiting groove, 102. reinforcement member, 200. limiting sleeve;

[0028] 1. cam assembly, 11. first cam piece, 12. second cam piece, 13. cam shaft, 14. collision piece, 141. mounting hole, 142. positioning shaft hole, 143. impact surface, 15. positioning shaft, 16. locking piece;

[0029] 2. Energy storage lever assembly, 21. Lever sheet, 211. Rotation hole, 22. Rotation shaft, 23. Spring matching shaft, 24. Fixed shaft, 25. Pushing shaft, 26. Impact part;

[0030] 3. Spring assembly; 4. Connecting rod assembly. DETAILED DESCRIPTION

[0031] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings. However, the applicant's description of the embodiments is not a limitation of the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as the protection scope of the present invention.

[0032] In the following description, all concepts related to directionality or orientation such as up, down, left, right, front and back are based on the positions shown in the corresponding drawings, and therefore cannot be understood as a special limitation on the technical solution provided by the present invention.

[0033] See also Figure 1 The present invention relates to an operating mechanism of a circuit breaker, the circuit breaker includes an operating mechanism and a contact system, including a pair of side plates 100 arranged face to face, and a cam assembly 1, an energy storage lever assembly 2, a spring assembly 3 and a connecting rod assembly 4 are arranged between the pair of side plates 100. The cam assembly 1 and the energy storage lever assembly 2 are both rotatably arranged between the pair of side plates 100; the spring assembly 3 is located between the pair of side plates 100, and the spring assembly 3 can be extended and retracted to release or store energy; the connecting rod assembly 4 can transmit the movement of the energy storage lever assembly 2 to the rotating shaft of the circuit breaker, so that the rotating shaft of the circuit breaker rotates and drives the contact system to operate.

[0034] like Figure 2 , Figure 3As shown, the energy storage lever assembly 2 includes a pair of lever pieces 21 that are spaced apart, and a fixed shaft 24 is provided between the pair of lever pieces 21. One end of the fixed shaft 24 is connected to one lever piece 21, and the other end is connected to the other lever piece 21. Preferably, three fixed shafts 24 are provided to ensure that a pair of lever pieces 21 are stably spaced apart. A rotating hole 211 is provided on each of the pair of lever pieces 21, and the rotating hole 211 is used for installing a rotating shaft 22. After the rotating shaft 22 passes through the rotating hole 211, the two ends are respectively provided on a pair of side plates 100. The energy storage lever assembly 2 swings around the rotating shaft 22, that is, the rotating shaft 22 is the rotation center of the energy storage lever assembly 2.

[0035] Please continue reading Figure 2 , Figure 3 A spring matching shaft 23 is provided on one swinging end of the pair of lever pieces 21. The spring matching shaft 23 is used to match with the spring assembly 3. That is, when the spring assembly 3 is extended, the spring assembly 3 pushes the spring matching shaft 23, thereby driving the energy storage lever assembly 2 to rotate. A push shaft 25 is provided on the other swinging end of the pair of lever pieces 21. Specifically, the push shaft 25 is a pair, which is respectively located on the opposite outer sides of the pair of lever pieces 21 and symmetrically arranged. The push shaft 25 is used to push and match with the cam assembly 1. During the energy release process of the operating mechanism, the spring assembly 3 drives the spring matching shaft 23 to swing; the push shaft 25 is provided on the other swinging end of the pair of lever pieces 21. During the energy release process of the operating mechanism, the push shaft 25 drives the cam assembly 1 to rotate. Preferably, a shaft sleeve is provided on both the spring matching shaft 23 and the push shaft 25 to reduce the friction force when pushing and matching with other components, thereby increasing the service life of the spring matching shaft 23 and the push shaft 25.

[0036] like Figure 3 , Figure 7 As shown, a collision piece 26 is provided on the energy storage lever assembly 2. In this embodiment, the collision piece 26 is in the shape of an axis and is located between a pair of lever sheets 21. The collision piece 26 is fixed between the pair of lever sheets 21. When the energy storage lever assembly 2 swings, the collision piece 26 also swings around the rotation center of the energy storage lever assembly 2, i.e., the rotation axis 22.

[0037] like Figure 2 , Figure 4As shown, the cam assembly 1 includes a cam piece group and a cam shaft 13, and the cam shaft 13 is rotatably arranged between a pair of side plates 100. The cam piece group is fixed on the cam shaft 13, and the cam piece group includes a first cam piece 11 and a second cam piece 12; the first cam piece 11 and the second cam piece 12 are fixedly sleeved on the cam shaft 13, that is, the first cam piece 11 and the second cam piece 12 do not rotate relative to the cam shaft 13. The first cam piece 11 and the second cam piece 12 are respectively engaged with the cam shaft 13 to ensure that the first cam piece 11 and the second cam piece 12 will not rotate relative to the cam shaft 13. Specifically, a protruding engaging strip is provided on the cam shaft 13, and corresponding engaging grooves are provided on the first cam piece 11 and the second cam piece 12, and the engaging strip is engaged with the engaging groove. A cam piece fixing shaft is also fixed between the first cam piece 11 and the second cam piece 12 to fix the two together at intervals. The first cam piece 11 is composed of two pieces and is arranged at intervals, wherein one first cam piece 11 is fixed to two second cam pieces 12, and the other first cam piece 11 is superimposed and fixed to one second cam piece 12 and one locking piece 16. The operating mechanism is also provided with a closing lever (not shown in the figure) for locking the cam assembly 1, and the locking piece 16 is used to lock and cooperate with the closing lever. The closing lever locks the locking piece 16, and when the operating mechanism releases energy to perform the closing action, the closing lever unlocks the locking piece 16, and then the closing lever unlocks the cam assembly 1.

[0038] like Figure 4 , Figure 5 As shown, a collision member 14 is sleeved on the part of the camshaft 13 between the pair of first cam pieces 11. In this embodiment, the collision member 14 is a sheet structure. The collision member 14 includes a mounting hole 141 and a positioning shaft hole 142. A collision surface 143 is also provided on the outer edge surface of the collision member 14. The mounting hole 141 is used for the camshaft 13 to pass through. The positioning shaft hole 142 is used to cooperate with a positioning shaft 15, that is, the two ends of the positioning shaft 15 are connected to the two first cam pieces 11, and the positioning shaft 15 passes through the positioning shaft hole 142. This arrangement enables the collision member 14 to rotate synchronously with the first cam piece 11 and the second cam piece 12. Similarly, the collision member 14, the first cam piece 11 and the second cam piece 12 are all in a fixed connection relationship with the camshaft 13, that is, they rotate synchronously during the rotation process. Preferably, the collision surface 143 is an arc surface to meet its working requirements.

[0039] like Figure 4As shown, the camshaft 13 is provided with limiting sleeves 200 on the shaft sections between the collision member 14 and the first cam pieces 11 on both sides, that is, there are two limiting sleeves 200, thereby limiting the position of the collision member 14 on the camshaft 13 and preventing the collision member 14 from sliding on the camshaft 13.

[0040] like Figure 3 to Figure 4 As shown, the collision member 14 cooperates with the collision member 26. When the two collide, the collision member 14 applies a torque to the collision member 26. The torque is used to enhance the rotational energy of the energy storage lever assembly 2 during the closing action. That is, the collision member 14 applies a torque to the collision member 26 that is consistent with the rotation direction of the energy storage lever assembly 2 during the closing process. In this embodiment, Figure 8 For example, the torque of the collision member 14 on the collision-receiving member 26 is used to strengthen the upward swing of the energy storage lever assembly 2.

[0041] Furthermore, at the moment when the collision member 14 hits the impacted member 26 , the direction of the force exerted by the collision member 14 on the impacted member 26 is tangent to the rotation direction of the impacted member 26 , thereby achieving optimal energy transfer.

[0042] like Figure 6 As shown, at this time, the energy storage lever assembly 2 is in the energy storage state, and the outer edge of the first cam piece 11 of the cam assembly 1 abuts against the push shaft 25 on the energy storage lever assembly 2. At this time, the push shaft 25 generates a force on the first cam piece 11. Figure 6 The force F1 is shown. The source of this force F1 is provided by the spring assembly 3. Before the energy is released, the cam assembly 1 cannot move due to the locking of the closing lever. When the operating mechanism releases the energy, the closing lever releases the lock on the cam assembly 1. Since the outer edge of the first cam piece 11 is involute-shaped. Therefore, the force F1 causes the first cam piece 11 to rotate. The first cam piece 11 rotates clockwise, here as Figure 6 At this time, the spring assembly 3 releases energy and begins to extend, and the spring assembly 3 pushes the spring matching shaft 23 of the energy storage lever assembly 2. The energy storage lever assembly 2 rotates, thereby driving the first cam piece 11 to rotate clockwise, and the cam assembly 1 is separated from the energy storage lever assembly 2. The further operation mechanism enters Figure 7 status.

[0043] like Figure 7 As shown, at this time, the operating mechanism is in an intermediate state during the energy release process, and the outer edge of the first cam plate 11 of the cam assembly 1 has been separated from the push shaft 25 on the energy storage lever assembly 2. Figure 2 and Figure 8 At this time, the collision member 14 rotates together with the camshaft 13, and the collision member 14 collides with the impacted member 26 on the energy storage lever assembly 2. Specifically, the collision surface 143 on the collision member 14 collides with the impacted member 26. In this collision, the force exerted by the collision member 14 on the impacted member 26 is F2, and the force F2 enables the energy storage lever assembly 2 to obtain a new driving force in the original energy release movement through the impacted member 26. In other words, the kinetic energy of the cam assembly 1 is released through the collision of the collision surface 143 and the impacted member 26, thereby effectively preventing the cam assembly 1 from having a vicious collision. At the same time, since the kinetic energy of the cam assembly 1 is transmitted to the energy storage lever assembly 2, the closing speed of the energy storage lever assembly 2 is faster, thereby improving the energy utilization rate of the operating mechanism. Figure 7 In the state shown, the energy storage lever assembly 2 is further pushed by the spring assembly 3 and enters Figure 8 status.

[0044] like Figure 8 As shown, at this time, the spring assembly 3 is in an energy release state, that is, the spring assembly 3 is stretched to the longest state. At this time, the two ends of the spring matching shaft 23 on the energy storage lever assembly 2 slide to the limit position along the limiting groove 101 on the side plate 100. Limiting grooves 101 are provided at symmetrical positions of the pair of side plates 100. In order to ensure the life of the limiting groove 101, a reinforcement piece 102 is provided on the periphery of the limiting groove 101 corresponding to the energy release state of the spring assembly 3, and the reinforcement piece 102 is attached to the side plate 100. The two ends of the spring matching shaft 23 slide in the limiting groove 101, thereby limiting the swing angle of the energy storage lever assembly 2. Figure 8 In the state, the energy storage lever assembly 2 swings to the extreme position.

[0045] In each of the above processes, the kinetic energy of the cam assembly 1 is released due to the collision of the collision member 14 and the collision member 26. At the same time, the rotational energy of the energy storage lever assembly 2 is strengthened once during the energy release process. Therefore, this structure can effectively prevent the vicious collision of the cam assembly 1, and can transfer the rotational energy of the cam assembly 1 to the energy storage lever assembly 2, thereby improving the energy utilization rate of the operating mechanism.

[0046] The impact part 26 in the above-mentioned embodiment can be a separate part or can be integrally formed with other parts of the energy storage lever assembly 2. For example, the impact part 26 is formed by bending the lever sheet 21 or the impact part 26 is a stamped protrusion. The present invention is not limited to the above-mentioned examples. As long as the requirements of the present invention can be met, any type of impact part 26 should fall within the protection scope of the present invention.

[0047] For the collision member 14 in the above embodiment, the collision member 14 can have various shapes, and in the above embodiment, it is a sheet. The collision member 14 can be fixed between a pair of first cam pieces 11 through the positioning shaft 15 described in the above embodiment. Of course, the collision member 14 can be directly fixed on the camshaft 13, or a combination of the two can be used to improve the fixing effect of the collision member 14 to better receive the impact.

[0048] After the operating mechanism completes the energy release action, the camshaft 13 is driven to rotate by an external force. Usually, the external force refers to the operator driving the camshaft 13 through the operating handle, or the electric operating mechanism driving the camshaft 13. After the camshaft 13 rotates, the cam assembly 1 fixed thereon also rotates. Figure 8 In the state shown, the cam assembly 1 rotates clockwise, the outer edge of the first cam piece 11 contacts the push shaft 25, and drives the push shaft 25 to swing, so that the energy storage lever assembly 2 rotates counterclockwise. After the energy storage lever assembly 2 rotates, the spring assembly 3 is compressed. Figure 6 Finally, the closing lever locks the cam assembly 1 in the energy storage state. The above process is the energy storage process of the operating mechanism.

Claims

1. An operating mechanism of a circuit breaker, comprising a pair of side plates (100) arranged face to face, a cam assembly (1) and an energy storage lever assembly (2) both rotatably arranged between the pair of side plates (100), and a spring assembly (3) located between the pair of side plates (100), wherein the cam assembly (1) comprises a cam plate group and a cam shaft (13), wherein the cam shaft (13) is rotatably arranged between the pair of side plates (100), and the cam plate group is fixed on the cam shaft (13), characterized in that: The cam assembly (1) further comprises a collision member (14), and the collision member (14) rotates synchronously with the cam plate group; the energy storage lever assembly (2) is provided with a collision member (26), and during the energy release process, the force of the spring assembly (3) causes the cam assembly (1) to rotate, and the energy storage lever assembly (2) to rotate; after the cam assembly (1) rotates, the collision member (14) rotates and hits the collision member (26), and the collision member (14) applies a torque to the collision member (26) that is consistent with the rotation direction of the energy storage lever assembly (2).

2. The operating mechanism of a circuit breaker according to claim 1, characterized in that The collision member (14) is in the shape of a sheet, and the collision-receiving member (26) is in the shape of a shaft.

3. The operating mechanism of a circuit breaker according to claim 1, characterized in that At the moment when the collision member (14) hits the impacted member (26), the direction of the force exerted by the collision member (14) on the impacted member (26) is tangent to the rotation direction of the impacted member (26).

4. The operating mechanism of a circuit breaker according to claim 1, characterized in that The collision member (14) comprises a mounting hole (141), a positioning shaft hole (142) and a positioning shaft (15); an impact surface (143) is also provided on the outer edge surface of the collision member (14); the mounting hole (141) is used for the cam shaft (13) to pass through; the positioning shaft (15) passes through the positioning shaft hole (142); both ends of the positioning shaft (15) are connected to the cam plate group; and the impact surface (143) is used for colliding with the impacted member (26).

5. The operating mechanism of a circuit breaker according to claim 4, characterized in that The cam piece group comprises a first cam piece (11) and a second cam piece (12); the first cam piece (11) and the second cam piece (12) are both fixedly sleeved on the cam shaft (13); the first cam piece (11) consists of two pieces and is arranged at an interval; the two ends of the positioning shaft (15) are respectively connected to the two first cam pieces (11) on both sides.

6. The operating mechanism of a circuit breaker according to claim 1, characterized in that The energy storage lever assembly (2) comprises a pair of lever sheets (21) and a rotating shaft (22) arranged at an interval, a fixed shaft (24) is arranged between the pair of lever sheets (21), a first rotating hole (211) is arranged on each of the pair of lever sheets (21), and the rotating shaft (22) passes through the first rotating hole (211) and the two ends are respectively arranged on a pair of side plates (100), and the energy storage lever assembly (2) swings around the rotating shaft (22); the impact member (26) is fixed between the pair of lever sheets (21).

7. The operating mechanism of a circuit breaker according to claim 6, characterized in that A spring matching shaft (23) is provided on one swinging end of the pair of lever pieces (21), and during the energy release process of the operating mechanism, the spring assembly (3) drives the spring matching shaft (23) to swing; a push shaft (25) is provided on the other swinging end of the pair of lever pieces (21), and during the energy release process of the operating mechanism, the push shaft (25) drives the cam assembly (1) to rotate.

8. The operating mechanism of a circuit breaker according to claim 7, characterized in that The pushing shafts (25) are a pair, respectively located on the opposite outer sides of the pair of lever sheets (21) and symmetrically arranged.

9. The operating mechanism of a circuit breaker according to claim 4, characterized in that The shaft section of the camshaft (13) between the collision member (14) and the first cam pieces (11) on both sides is respectively sleeved with a limiting shaft sleeve (200).

10. The operating mechanism of a circuit breaker according to claim 4, characterized in that The impact surface (143) is a curved surface.

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