A circuit breaker closing bounce suppression mechanism and a high-voltage vacuum circuit breaker

Abstract

The utility model provides a kind of circuit breaker closing bounce suppression mechanism, it is set between the insulating pull rod and movable conducting rod of high-voltage vacuum circuit breaker, including spring guide and the contact spring of being sleeved in the outside of spring guide;The upper end of spring guide is connected with insulating pull rod;The lower end of contact spring is connected with spring support, and spring support can move up and down along spring guide;The lower end of spring guide is connected with buffer, and the upper end of movable conducting rod is connected and abuts in buffer.The utility model further provides a kind of high-voltage vacuum circuit breaker, including circuit breaker body, the circuit breaker body includes insulating pull rod and movable conducting rod, and the circuit breaker closing bounce suppression mechanism of the utility model is arranged between insulating pull rod and movable conducting rod.The closing bounce mechanism provided by the utility model can realize efficient bounce suppression by the synergistic effect of double buffering mechanism without damaging the mechanical properties of circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage electrical technology, and in particular to a mechanism for suppressing the closing bounce of a high-voltage vacuum circuit breaker. Background Technology

[0002] During the operation of high-voltage vacuum circuit breakers, closing bounce is a critical issue affecting their reliability and service life. Closing bounce refers to the phenomenon where, during circuit breaker closing, the moving contact of the vacuum bulb collides with the stationary contact, and the moving contact rebounds, causing a brief separation between the moving and stationary contacts. This bounce can exacerbate contact wear, increase the risk of arc erosion, and even affect the stable operation of the power grid.

[0003] In the existing technology, the means to suppress closing bounce mainly include two categories: one is to adopt a low bounce contact mechanism, which reduces the collision energy by optimizing the contact shape or material; the other is to set an efficient buffer device at the closing end of the mechanism, which reduces the collision impact by the movement of the buffer mechanism.

[0004] However, the aforementioned technologies have certain limitations: relying solely on contact mechanism optimization is insufficient to effectively control bouncing under high-energy collisions; and improperly designed traditional buffer devices may increase the load on the mechanism while suppressing bouncing, or generate additional resistance during closing, affecting the normal operation of the circuit breaker (such as the smoothness of the overtravel phase), and even leading to a shortened mechanical life. Therefore, there is an urgent need for a technical solution that can balance bouncing suppression with the stability of mechanism operation. Utility Model Content

[0005] In view of the above-mentioned shortcomings of current high-voltage vacuum circuit breakers, this utility model provides a circuit breaker closing bounce suppression mechanism. This mechanism can achieve efficient bounce suppression without damaging the mechanical performance of the circuit breaker through the synergistic effect of the double buffer mechanism.

[0006] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0007] A circuit breaker closing bounce suppression mechanism is disposed between the insulating pull rod and the moving conductive rod of a high-voltage vacuum circuit breaker, including a spring guide and a contact spring sleeved on the outside of the spring guide;

[0008] The upper end of the spring guide is connected to the insulating pull rod;

[0009] The lower end of the contact spring is connected to a spring support, which can move up and down along the spring guide.

[0010] The feature is that the lower end of the spring guide is connected to a buffer, and the lower end of the buffer is connected to and abuts against the upper end of the moving conductive rod.

[0011] According to one aspect of the present invention, the spring guide consists of a top, a flange, and a main body from top to bottom. The top is provided with a first pin hole, the main body is provided with a second pin hole, and the contact spring is sleeved on the outside of the main body with its upper end abutting against the lower side of the flange.

[0012] According to one aspect of this utility model, the first pin hole is circular, and a pin hole adapted to the first pin hole is provided on the lower side of the insulating rod. After alignment, a pin is inserted to fix the insulating rod and the spring guide member in place.

[0013] According to one aspect of the present invention, the second pin hole is waist-shaped, and the side of the spring support is provided with a pin hole that matches the second pin hole. After alignment, a pin is inserted to movably connect the spring support and the spring guide.

[0014] According to one aspect of the present invention, the lower end of the spring guide is provided with a groove, and the upper end of the buffer is inserted into the groove.

[0015] According to one aspect of the present invention, the spring support has a through opening, the spring guide is inserted into the opening, and the spring support can slide axially along the spring guide through the opening to compress the contact spring.

[0016] According to one aspect of the present invention, the buffer includes a buffer body and a piston rod, the piston rod being connected to and abutting against the upper end of the movable conductive rod.

[0017] According to one aspect of the present invention, the upper end of the movable conductive rod is provided with a threaded hole and a vacuum bubble fastening bolt is screwed in, and the piston rod abuts against the nut of the vacuum bubble fastening bolt.

[0018] According to one aspect of this utility model, the buffer is a hydraulic buffer.

[0019] A high-voltage vacuum circuit breaker includes a circuit breaker body, the circuit breaker body including an insulating tie rod and a moving conductive rod, and a circuit breaker closing bounce suppression mechanism is provided between the insulating tie rod and the moving conductive rod.

[0020] The advantages of this invention are as follows: First, through the synergistic effect of the initial pressure of the contact spring and the damping force of the buffer, the closing bounce of the high-voltage vacuum circuit breaker can be controlled below 5ms to achieve efficient bounce suppression. Second, the damping characteristic design of the buffer avoids excessive contact spring force, reduces mechanical impact and vibration, and ensures the mechanical life of the circuit breaker. Third, the damping force of the buffer is negligible during the overtravel phase, ensuring a smooth closing process without affecting the closing action or interfering with the normal operation of the circuit breaker. Finally, the buffer is integrated inside the conductive base, has strong structural compatibility, does not require significant modifications to the overall structure of the circuit breaker, and is easily adapted to existing high-voltage vacuum circuit breaker designs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the circuit breaker closing bounce suppression mechanism described in this utility model;

[0023] Figure 2 This is a schematic diagram of the high-voltage vacuum circuit breaker structure equipped with a circuit breaker closing bounce suppression mechanism as described in this utility model.

[0024] Figure 3 This is a front view of the spring guide component described in this utility model;

[0025] Figure 4 This is a bottom view of the spring guide component described in this utility model;

[0026] Figure 5 This is a diagram showing the closing test effect of the circuit breaker closing bounce suppression mechanism structure described in this utility model.

[0027] Among them: 100, spring guide; 101, spring support; 102, contact spring; 103, buffer; 200, insulating pull rod; 201, moving conductive rod; 100a, top; 100b, flange; 100c, main body; 100d, first pin hole; 100e, second pin hole; 100f, groove; 103a, buffer body; 103b, piston rod; 202, vacuum bubble fastening bolt; 202a, nut; 203, stationary conductive rod; 201a, moving contact; 203a, stationary contact; 204, vacuum bubble; 205, conductive base. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figure 1 and Figure 2 As shown, a circuit breaker closing bounce suppression mechanism is disposed between the insulating pull rod 200 and the moving conductive rod 201 of a high-voltage vacuum circuit breaker, and includes a spring guide 100, a spring support 101, a contact spring 102, and a buffer 103.

[0030] The upper end of the spring guide 100 is connected to the insulating pull rod 200; the contact spring 102 is sleeved on the outside of the spring guide 100 and the lower end of the contact spring 102 is connected to the spring support 101, which can move along the axial direction of the spring guide 100; the lower end of the spring guide 100 is connected to the buffer 103, and the lower end of the buffer 103 is connected to and abuts against the upper end of the moving conductive rod 201.

[0031] like Figure 3 and Figure 4 As shown in the embodiment of this utility model, the spring guide 100, which is used for fixed assembly, can be divided into a top 100a, a flange 100b, and a main body 100c from top to bottom. The top 100a has a first pin hole 100d at a suitable position near the upper side, and the main body 100c has a second pin hole 100e at a suitable position near the lower side. After assembly, the contact spring 102 is sleeved on the outside of the main body 100c, and the upper end of the contact spring 102 abuts against the lower side of the flange.

[0032] Meanwhile, the spring support 101 is provided with a through hole, the shape and size of which are adapted to the shape and size of the main body 100c of the spring guide 100. During assembly, the spring guide 100 is inserted into the through hole, and the spring support 101 can slide axially along the main body 100c of the spring guide 100 through the through hole, thereby compressing the contact spring 102.

[0033] The first pin hole 100d is circular, and the lower side of the insulating rod 200 has a pin hole that matches the first pin hole 100d. During assembly, the first pin hole 100d and the pin hole on the lower side of the insulating rod 200 are aligned and a pin is inserted to fix the insulating rod 200 and the spring guide 100 together. The connection between the two is a fixed connection.

[0034] The second pin hole 100e is oblong, and the side of the spring support 101 has a pin hole that matches the second pin hole 100e. During assembly, the second pin hole 100e is aligned with the pin hole on the side of the spring support 101, and a pin is inserted to connect the spring support 101 and the spring guide 100 together. The connection between the two is a movable connection. It can be understood that when the spring support 101 slides axially along the main body 100c of the spring guide 100 to compress the contact spring 102, the pin can move axially within a suitable range within the oblong second pin hole 100e. This serves a fixing function without affecting the compression of the contact spring 102 by the spring support 101.

[0035] The lower end of the spring guide 100 (specifically, the main body 100c of the spring guide 100) is provided with a groove 100f. During assembly, the upper end of the buffer 103 is inserted into the groove 100f. In this way, the spring guide 100 and the buffer 103 can be fixedly connected together.

[0036] The buffer 103 includes a buffer body 103a and a piston rod 103b. During assembly, the piston rod 103b is connected to and abuts against the upper end of the movable conductive rod 201. In this embodiment of the present invention, the buffer 103 is a hydraulic buffer; to protect the movable conductive rod 201, the upper end of the movable conductive rod 201 is provided with a threaded hole into which a vacuum bubble fastening bolt 202 is screwed, and the piston rod 103b abuts against the nut 202a of the vacuum bubble fastening bolt 202.

[0037] The insulating rod 200 is driven by an external mechanism to close or open the circuit breaker. The insulating rod 200 itself must have good insulation performance to achieve electrical isolation between the moving conductive part and other components in a high-voltage circuit environment, ensuring the safety of circuit breaker operation.

[0038] The lower end of the moving conductive rod 201 is the moving contact 201a, and the upper end of the stationary conductive rod 203 is the stationary contact 203a. Both the moving contact 201a and the stationary contact 203a are located inside the vacuum bubble 204. In this embodiment of the invention, the insulating pull rod 200 is connected to the moving conductive rod 201 through the spring guide 100 and the buffer 103, and is a key component for transmitting the closing action. When the circuit breaker closes, the closing force triggered by the external mechanism is transmitted to the moving conductive rod 201 through the insulating pull rod 200, causing the moving contact 201a to move towards the stationary contact 203a, thus closing the circuit. During the closing process, the moving contact 201a collides with the stationary contact 203a, creating a bouncing tendency.

[0039] When the moving contact 201a collides with the stationary contact 203a and bounces, the moving end, after colliding, tends to separate the moving and stationary contacts due to the movement of the insulating rod 200 (the stationary conductive rod 203 is fixed). At this time, the nut 202a on the moving conductive rod 201 acts on the piston rod 103b of the buffer 103, causing the buffer 103 to be compressed and generating a damping force. This damping force, together with the initial pressure of the contact spring 102, acts on the insulating rod 200, preventing it from continuing to move, thereby suppressing the separation of the moving and stationary contacts and achieving the purpose of controlling the closing bounce.

[0040] The buffer 103 installed inside the conductive base 205 is designed to ensure good contact between the moving contact 201a and the stationary contact 203a during the closing process of the vacuum circuit breaker 204, reducing bounce and thus ensuring the normal operation of the vacuum circuit breaker 204. In actual high-voltage vacuum circuit breaker assembly, the conductive base 205 is usually securely mounted on the circuit breaker frame or a specific support structure to ensure its stability during operation, thereby ensuring that the connection with components such as the insulating tie rod 200 can function reliably.

[0041] Figure 5 The diagram shows the closing test results of a high-voltage vacuum circuit breaker equipped with the closing bounce mechanism described in this utility model. Figure 5 It can be seen that a high-voltage vacuum circuit breaker equipped with a closing bounce mechanism can effectively prevent bounce during closing through a double buffer mechanism, and can control the closing bounce to less than 5ms.

[0042] In this embodiment, the specific process for suppressing closing bounce is as follows:

[0043] Closing action triggering and initial movement: Closing is triggered by an external mechanism. The insulating pull rod 200 drives the moving conductive rod 201 and the moving contact 201a to move towards the stationary contact 203a. At this time, the contact spring 102 is gradually compressed to reserve elastic force for subsequent contact.

[0044] Collision and bounce tendency of moving and stationary contacts: When the moving contact 201a collides with the stationary contact 203a, the moving end (including the moving contact 201a and the moving conductive rod 201) will rebound due to the collision, which will drive the insulating pull rod 200 to move accordingly. At this time, the moving and stationary contacts may separate, forming the initial driving force for closing bounce.

[0045] The dual forces that suppress bouncing include:

[0046] The initial pressure of the contact spring plays a role: the initial pressure of the contact spring 102 is a parameter set to suppress bounce, which will generate resistance to the rebound motion of the moving end and prevent the moving contact 201a from separating from the stationary contact 203a.

[0047] The damping force of the buffer works synergistically: the movement of the insulating rod 200 compresses the piston of the buffer 103 into the buffer body 103a, at which time the buffer 103 provides damping force. Due to its specially designed damping characteristics, at the moment of collision and rebound of the moving and stationary contacts, the piston compression speed increases sharply, and the damping force increases dramatically to its maximum value. Together with the initial pressure of the contact spring 102, it strongly resists the movement of the insulating rod 200, thereby preventing the moving contact 201a from separating from the stationary contact 203a.

[0048] Adaptability during the overtravel phase of closing: When the circuit breaker closes and travels overtravel (i.e., the part of the stroke where the contact spring 102 continues to compress after the collision), the compression speed of the buffer piston is very small, and its damping force is rapidly reduced to negligible, so as not to interfere with the closing action of the circuit breaker and to ensure that the closing process is completed smoothly.

[0049] A high-voltage vacuum circuit breaker includes a circuit breaker body, which comprises an insulating tie rod and a moving conductive rod. A circuit breaker closing bounce suppression mechanism, as described above, is provided between the insulating tie rod and the moving conductive rod.

[0050] The advantages of this invention are as follows: First, through the synergistic effect of the initial pressure of the contact spring and the damping force of the buffer, the closing bounce of the high-voltage vacuum circuit breaker can be controlled below 5ms to achieve efficient bounce suppression. Second, the damping characteristic design of the buffer avoids excessive contact spring force, reducing mechanical impact and vibration, and ensuring the mechanical life of the circuit breaker. Third, the damping force of the buffer is negligible during the overtravel phase, ensuring a smooth closing process without affecting the closing action or interfering with the normal operation of the circuit breaker. Finally, the buffer is integrated inside the conductive base, resulting in strong structural compatibility. It requires no major modifications to the overall structure of the circuit breaker and is easily adapted to existing high-voltage vacuum circuit breaker designs. In summary, the circuit breaker closing bounce suppression mechanism of this invention achieves efficient bounce suppression without damaging the mechanical performance of the circuit breaker through the synergistic effect of the dual buffer mechanisms.

[0051] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A circuit breaker closing bounce suppression mechanism, disposed between the insulating pull rod (200) and the moving conductive rod (201) of a high-voltage vacuum circuit breaker, comprising a spring guide (100) and a contact spring (102) sleeved on the outside of the spring guide (100). The upper end of the spring guide (100) is connected to the insulating pull rod (200). The lower end of the contact spring (102) is connected to a spring support (101), which can move up and down along the spring guide (100). Its features are, The lower end of the spring guide (100) is connected to a buffer (103), and the lower end of the buffer (103) is connected to and abuts against the upper end of the moving conductive rod (201).

2. The circuit breaker closing bounce suppression mechanism according to claim 1, characterized in that, The spring guide (100) consists of a top (100a), a flange (100b), and a main body (100c) from top to bottom. The top (100a) has a first pin hole (100d), and the main body (100c) has a second pin hole (100e). The contact spring (102) is sleeved on the outside of the main body (100c), and the upper end of the contact spring (102) abuts against the lower side of the flange (100b).

3. The circuit breaker closing bounce suppression mechanism according to claim 2, characterized in that, The first pin hole (100d) is circular. The lower side of the insulating pull rod (200) is provided with a pin hole that matches the first pin hole (100d). After alignment, a pin is inserted to fix the insulating pull rod (200) and the spring guide (100) together.

4. The circuit breaker closing bounce suppression mechanism according to claim 2, characterized in that, The second pin hole (100e) is waist-shaped. The side of the spring support (101) is provided with a pin hole that matches the second pin hole (100e). After alignment, a pin is inserted to movably connect the spring support (101) and the spring guide (100).

5. The circuit breaker closing bounce suppression mechanism according to claim 1, characterized in that, The lower end of the spring guide (100) is provided with a groove (100f), and the upper end of the buffer (103) is inserted into the groove (100f).

6. The circuit breaker closing bounce suppression mechanism according to claim 1, characterized in that, The spring support (101) has a through opening, and the spring guide (100) is inserted into the opening. The spring support (101) can slide along the axial direction of the spring guide (100) through the opening, thereby compressing the contact spring (102).

7. The circuit breaker closing bounce suppression mechanism according to claim 1, characterized in that, The buffer (103) includes a buffer body (103a) and a piston rod (103b), the piston rod (103b) being connected to and abutting against the upper end of the moving conductive rod (201).

8. The circuit breaker closing bounce suppression mechanism according to claim 7, characterized in that, The upper end of the moving conductive rod (201) is provided with a threaded hole and a vacuum bubble fastening bolt (202) is screwed in. The piston rod (103b) abuts against the nut (202a) of the vacuum bubble fastening bolt (202).

9. The circuit breaker closing bounce suppression mechanism according to any one of claims 1 to 8, characterized in that, The buffer (103) is a hydraulic buffer.

10. A high-voltage vacuum circuit breaker, comprising a circuit breaker body, the circuit breaker body including an insulating pull rod (200) and a moving conductive rod (201), characterized in that, A circuit breaker closing bounce suppression mechanism as described in claim 9 is provided between the insulating pull rod (200) and the moving conductive rod (201).

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