An auxiliary mechanism of a circuit breaker

Abstract

The present invention discloses an auxiliary mechanism of a circuit breaker, belonging to the technical field of switch cabinets. The present invention includes a base and a mechanism main shaft (3), and is characterized in that the auxiliary mechanism includes a mounting bracket (101), a main shaft cantilever (102), and an energy storage mechanism. The main shaft cantilever (102) is mounted on the mechanism main shaft (3) and rotates with the mechanism main shaft. The mounting bracket (101) is fixed to the base and is used to mount the auxiliary mechanism on the circuit breaker. The energy storage mechanism is arranged between the main shaft cantilever (102) and the mounting bracket (101) and is used to store energy during the opening and closing processes of the circuit breaker, and the acting force direction on the main shaft cantilever (102) turns after the energy storage reaches the maximum value. The auxiliary mechanism of the circuit breaker provided by the present invention can not only improve the breaking capacity of the main mechanism but also improve the short-term withstand capacity of the main mechanism.

Description

Technical Field

[0001] The invention belongs to the technical field of switch cabinets, and particularly relates to an auxiliary mechanism of an operating mechanism of a low-voltage circuit breaker. Background Art

[0002] In distribution electrical appliances, a circuit breaker is used to distribute electric energy and protect circuits and equipment from the hazards of faults such as overload and short circuit. With the increase in power consumption and the development of high-power electrical appliances, various indicators of the circuit breaker are constantly improving, especially the improvement of the short-time withstand capacity. When the volume of the circuit breaker remains unchanged, if the short-time withstand performance is to be improved, it is necessary to increase the force value of the moving contact spring; the increase in the force value of the moving contact spring requires an increase in the force value of the main spring of the mechanism. On the other hand, in order to improve the breaking capacity, the auxiliary mechanism of the current circuit breakers on the market generally needs to increase the force value of the opening pull spring, and the opening pull spring will offset a part of the main spring force value, resulting in the inability to significantly improve the breaking capacity and the short-time withstand capacity at the same time, and unable to meet the requirements of high-index users (especially some wind power projects).

[0003] Chinese Patent with publication number CN 20216743 U discloses a large-capacity circuit breaker operating mechanism, including a main mechanism, an auxiliary mechanism, and a main shaft passing through the main mechanism and the auxiliary mechanism. The auxiliary mechanism has a bracket and a needle bearing arranged on the bracket. The main shaft is inserted through the hole arranged on the bracket on the auxiliary mechanism, and the needle bearing is arranged in rolling contact with the main shaft. This circuit breaker operating mechanism only reduces the frictional resistance when the main shaft moves through the needle bearing during opening, that is, only functions as an opening pull spring, and fails to improve the short-time withstand capacity of the main mechanism. Summary of the Invention

[0004] The purpose of the invention is to provide an auxiliary mechanism that can improve both the breaking capacity and the short-time withstand capacity of the main mechanism.

[0005] Specifically, the invention is implemented by adopting the following technical solutions: including a base and a mechanism main shaft (3), characterized in that the auxiliary mechanism includes a mounting bracket (101), a main shaft cantilever (102), and an energy storage mechanism. The main shaft cantilever (102) is installed on the mechanism main shaft (3) and rotates with the mechanism main shaft. The mounting bracket (101) is fixed on the base and is used to install the auxiliary mechanism on the circuit breaker. The energy storage mechanism is arranged between the main shaft cantilever (102) and the mounting bracket (101) and is used to store energy during the opening and closing processes of the circuit breaker, and the acting force direction on the main shaft cantilever (102) turns after the energy storage reaches the maximum value.

[0006] Furthermore, the energy storage mechanism includes a guide rod (103), a spring (105), and a spring support (107); a guide hole is provided on the spring support (107), and it is rotatably mounted on the mounting bracket (101); one end of the guide rod (103) is hinged to the main shaft cantilever 102, and the other end is movably inserted into the guide hole of the spring support (107); the spring (105) is mounted on the spring support (107), with one end acting on the end of the spring support (107) and the other end acting on the guide rod (103).

[0007] Furthermore, the mounting bracket (101) includes side plates spaced along the direction of the mechanism main shaft (3), and the main shaft cantilever (102) is arranged between the two side plates.

[0008] Furthermore, the spring support (107) is a long strip-shaped plate structure with a width, one end of which is rotatably mounted on one side plate of the mounting bracket (101), and the other end is rotatably mounted on the other side plate of the mounting bracket (101).

[0009] Furthermore, when the rotation center of the mechanism main shaft (3), the rotation center of the rotation shaft of the guide rod (103), and the rotation center of the spring support (107) are on a straight line, the energy storage of the spring (105) reaches the maximum value.

[0010] Furthermore, the guide rod (103) includes a head and a rod portion, the diameter of the head is larger than that of the rod portion, the spring (105) is sleeved on the rod portion, one end of which abuts against the head, and the other end abuts against the spring support (107).

[0011] Furthermore, a through slot is provided at one end of the head. After the end of the main shaft cantilever (102) is cut into the through slot, it is hinged to the head through a shaft pin (104).

[0012] On the other hand, the present invention also provides a circuit breaker, which adopts the auxiliary mechanism (1) of the circuit breaker described in the above technical solution. The auxiliary mechanism (1) of the circuit breaker is inserted through the hole provided in the mounting bracket (101) on the mechanism main shaft (3), and the main shaft cantilever (102) is sleeved on the mechanism main shaft (3) and is driven to rotate by the mechanism main shaft (3).

[0013] The beneficial effects of the present invention are as follows: The auxiliary mechanism of the circuit breaker of the present invention is used to assist the mechanism in closing and opening. During closing, the auxiliary mechanism helps the main mechanism to close to increase the moving contact pressure and thus increase the short withstand capacity; during opening, the auxiliary mechanism helps the main mechanism to open to increase the opening speed and thus increase the breaking capacity. Among them, the energy storage spring of the auxiliary mechanism is used as both the opening spring and the closing spring, effectively reducing the force value required by the main spring of the mechanism and ensuring the reliability of the product. Brief Description of the Drawings

[0014] Figure 1 is the front isometric view of the main mechanism in the open state of Embodiment 1 of the present invention.

[0015] Figure 2 is the front isometric view of the auxiliary mechanism in the open state of Embodiment 1 of the present invention.

[0016] Figure 3 is the sectional view of the auxiliary mechanism along the axis of the guide rod in the open state of Embodiment 1 of the present invention.

[0017] Figure 4 is the front isometric view of the main mechanism in the energy storage state of Embodiment 1 of the present invention.

[0018] Figure 5 is the front isometric view of the auxiliary mechanism in the energy storage state of Embodiment 1 of the present invention.

[0019] Figure 6 is the sectional view of the auxiliary mechanism along the axis of the guide rod in the energy storage state of Embodiment 1 of the present invention.

[0020] Figure 7 is the front isometric view of the main mechanism in the closed state of Embodiment 1 of the present invention.

[0021] Figure 8 is the front isometric view of the auxiliary mechanism in the closed state of Embodiment 1 of the present invention.

[0022] Figure 9 is the sectional view of the auxiliary mechanism along the axis of the guide rod in the closed state of Embodiment 1 of the present invention.

[0023] Reference numerals in the figures: 1 - auxiliary mechanism, 101 - mounting bracket, 102 - main shaft cantilever, 103 - guide rod, 104 - pin, 105 - spring, 106 - rotating shaft, 107 - spring support, 2 - main mechanism, 201 - moving contact, 202 - contact spring, 3 - mechanism main shaft. Detailed Description of the Invention

[0024] The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0025] Embodiment 1:

[0026] An embodiment of the present invention is an auxiliary mechanism of a circuit breaker, which is mainly used to assist the main mechanism in closing and opening.

[0027] Refer to Figure 1, the operating mechanism of the circuit breaker includes a main mechanism 2, an auxiliary mechanism 1, and a mechanism main shaft 3 passing through the main mechanism and the auxiliary mechanism. The auxiliary mechanism 1 consists of a mounting bracket 101, a main shaft cantilever 102, a guide rod 103, a shaft pin 104, a spring 105, a rotating shaft 106, and a spring support 107. Among them, the guide rod 103, the spring 105, and the spring support 107 are energy storage mechanisms.

[0028] Referring to Figures 1 to 3 , the auxiliary mechanism 1 is inserted through the hole provided in the mounting bracket 101 on the mechanism main shaft 3. The main shaft cantilever 102 is sleeved on the mechanism main shaft 3 and is driven to rotate by the mechanism main shaft 3. The mounting bracket 101 is installed on the circuit breaker base. The spring support 107 is connected to the mounting bracket 101 through the rotating shaft 106 and can rotate around the rotating shaft 106. One end of the guide rod 103 is connected to the main shaft cantilever 102 through the shaft pin 104. The other end of the guide rod 103 is inserted into the guide hole of the spring support 107 and can slide freely in the guide hole of the spring support 107. The spring 105 is installed on the spring support 107. One end of it acts on the spring support 107, and the other end acts on the guide rod 103. Referring to Figure 3 , when the main shaft cantilever 102 rotates clockwise, it pushes the guide rod 103, and the guide rod 103 compresses the spring 105, thereby driving the spring support 107 to rotate around the rotating shaft 106; after the spring 105 is compressed, it pushes the guide rod 103, thereby driving the main shaft cantilever 102 to rotate counterclockwise.

[0029] When the circuit breaker changes from the open state (referring to Figure 3 ) to the closed state (referring to Figure 6 ) through the energy storage state (referring to Figure 9 ) during the closing process, the main spring (not shown in the figure) of the main mechanism 2 drives the mechanism main shaft 3 to rotate clockwise. The mechanism main shaft 3 drives the main shaft cantilever 102 to rotate clockwise. The main shaft cantilever 102 pushes the guide rod 103 to move to the right through the shaft pin 104. At the same time, the spring support 107 will rotate counterclockwise under the action of the guide rod 103 and the spring 105 (referring to Figure 2 ) to ensure that the guide rod 103 can slide in the guide hole of the spring support 107. When the guide rod 103 slides to the right, it compresses the spring 105 for energy storage. Referring to Figures 4 to 6 , when the rotation centers of the mechanism main shaft 3, the shaft pin 104, and the spring support 107 are on a straight line, the energy storage of the spring 105 reaches the maximum value. At this time, it is also the turning point of the acting force direction of the energy storage mechanism. Since the contact spring 202 does not generate a reaction force on the main spring (not shown in the figure) of the main mechanism 2 at this time, and the main spring of the main mechanism 2 is much larger than the force value of the spring 105, the energy storage mechanism can easily store energy to the maximum energy. Referring to Figures 7 to 9 , when the mechanism main shaft 3 continues to rotate clockwise, the acting force direction of the energy storage mechanism turns. Referring toFigure 9 , the spring 105 pushes the guide rod 103 to move downward and leftward. The guide rod 103 acts on the main shaft cantilever 102 through the pin 104, causing the main shaft cantilever 102 to rotate clockwise, that is, helping the main shaft 3 of the pushing mechanism to rotate clockwise to ensure that the moving contact 201 closes. At this time, the spring 105 acts as a closing spring to help the circuit breaker reach the closing state.

[0030] When the circuit breaker changes from the closing state (refer to Figure 9 ) to the energy storage state (refer to Figure 6 ) and then to the opening state (refer to Figure 3 ) during the opening process, the moving contact 201 contacts the static contact, compressing the contact spring 202. The contact spring 202 gives a corresponding reaction force to the moving contact 201. At this time, the force value of the opening draw spring (not shown in the figure) of the main mechanism 2 and the reaction force of the contact spring 202 on the moving contact 201 drive the main shaft 3 of the mechanism to rotate counterclockwise. ( Figure 9 the force in the right direction in Figure 8 ) The main shaft 3 of the mechanism drives the main shaft cantilever 102 to rotate counterclockwise. The main shaft cantilever 102 pushes the guide rod 103 to move rightward through the pin 104. At the same time, the spring support 107 will rotate clockwise under the action of the guide rod 103 and the spring 105 (refer to Figure 8 ) to ensure that the guide rod 103 can slide in the guide hole of the spring support 107. When the guide rod 103 slides rightward, it will compress the spring 105 for energy storage. Refer to Figures 4 to 6 . When the rotation center of the main shaft 3 of the mechanism, the center of the pin 104, and the rotation center of the spring support 107 are on a straight line, the energy storage of the spring 105 reaches the maximum value. At this time, it is also the turning point of the acting force direction of the energy storage mechanism. Since the force value of the main spring (not shown in the figure) of the main mechanism 2 does not act on the main shaft 3 of the mechanism at this time, and the sum of the force value of the opening spring (not shown in the figure) of the main mechanism 2 and the reaction force of the contact spring 202 on the moving contact 201 is much greater than the force value of the spring 105, the energy storage mechanism can easily store energy to the maximum energy. Refer to Figures 1 to 3 . When the main shaft 3 of the mechanism continues to rotate counterclockwise, the acting force direction of the energy storage mechanism turns. Refer to Figure 3 . The spring 105 pushes the guide rod 103 to move upward and leftward. The guide rod 103 acts on the main shaft cantilever 102 through the pin 104, causing the main shaft cantilever 102 to have a tendency to rotate counterclockwise, that is, helping the main shaft 3 of the pushing mechanism to rotate counterclockwise to ensure that the moving contact 201 opens. At this time, the spring 105 acts as an opening spring to help the circuit breaker reach the opening state.

[0031] The energy storage spring of the present invention is used both as an opening spring and as a closing spring, effectively reducing the force value of the main spring of the mechanism and ensuring the reliability of the product.

[0032] Although the present invention has been disclosed above with the preferred embodiments, the embodiments are not intended to limit the present invention. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be defined by the content defined in the claims of this application.

Claims

1. An auxiliary mechanism of a circuit breaker, the circuit breaker comprising a base and a mechanism main shaft (3), characterized in that, The auxiliary mechanism includes a mounting bracket (101), a main shaft cantilever (102), and an energy storage mechanism. The main shaft cantilever (102) is mounted on the mechanism main shaft (3) and rotates with the mechanism main shaft. The mounting bracket (101) is fixed to the base and is used to mount the auxiliary mechanism on the circuit breaker. The energy storage mechanism is arranged between the main shaft cantilever (102) and the mounting bracket (101) and is used to store energy during the opening and closing processes of the circuit breaker, and the acting force direction on the main shaft cantilever (102) turns after the energy storage reaches the maximum value; the energy storage mechanism includes a guide rod (103), a spring (105), and a spring support (107); a guide hole is provided on the spring support (107), and it is rotatably mounted on the mounting bracket (101); one end of the guide rod (103) is hinged to the main shaft cantilever (102), and the other end is movably inserted into the guide hole of the spring support (107); the spring (105) is mounted on the spring support (107), one end of which acts on the end of the spring support (107), and the other end acts on the guide rod (103).

2. The auxiliary mechanism of the circuit breaker according to claim 1, characterized in that The mounting bracket (101) includes side plates arranged at intervals along the direction of the mechanism main shaft (3), and the main shaft cantilever (102) is arranged between the two side plates.

3. The auxiliary mechanism of the circuit breaker according to claim 2, characterized in that, The spring support (107) is a long strip-shaped plate structure with a width, one end of which is rotatably mounted on one side plate of the mounting bracket (101), and the other end is rotatably mounted on the other side plate of the mounting bracket (101).

4. The auxiliary mechanism of the circuit breaker according to claim 1, characterized in that, When the rotation centers of the mechanism main shaft (3), the rotation center of the rotation shaft of the guide rod (103), and the rotation center of the spring support (107) are on a straight line, the energy storage of the spring (105) reaches the maximum value.

5. The auxiliary mechanism of the circuit breaker according to claim 1, characterized in that, The guide rod (103) includes a head and a rod portion, the diameter of the head is larger than that of the rod portion, the spring (105) is sleeved on the rod portion, one end of which abuts against the head, and the other end abuts against the spring support (107).

6. The auxiliary mechanism of the circuit breaker according to claim 5, characterized in that A straight through groove is provided at one end of the head. After the end of the main shaft cantilever (102) cuts into the straight through groove, it is hinged to the head through a shaft pin (104).

7. A circuit breaker, characterized in that, Adopt the auxiliary mechanism (1) of the circuit breaker as described in any one of claims 1-6. The auxiliary mechanism (1) of the circuit breaker is inserted on the mechanism main shaft (3) through the holes provided on the mounting bracket (101), the main shaft cantilever (102) is sleeved on the mechanism main shaft (3), and is driven to rotate by the mechanism main shaft (3).

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