An assembly for overreach adjustment of a vacuum circuit breaker

Abstract

The utility model relates to an assembly for vacuum circuit breaker overtravel adjustment, including overtravel spring cylinder, overtravel spring, overtravel spring adjusting guide rod, overtravel spring limiting nut, overtravel spring cylinder top and cam are connected, overtravel spring is placed in overtravel spring cylinder inside, and is set on overtravel spring adjusting guide rod upper end, overtravel spring limiting nut is movably set on overtravel spring adjusting guide rod outside, and is connected with overtravel spring cylinder thread, overtravel spring adjusting guide rod has a boss on, and the boss is located between overtravel spring and overtravel spring limiting nut, one end of overtravel spring leans against overtravel spring cylinder top, and the other end contacts with the boss, overtravel spring adjusting guide rod is connected with movable contact pull rod through soft connection fastening guide pipe, and overtravel spring adjusting guide rod is connected with soft connection fastening guide pipe thread, the assembly of the utility model has overtravel adjustment function and prevents the ability of clamping stagnation, ensures smooth operation in the installation and overtravel adjustment process, thereby realizes simple and efficient overtravel adjustment effect.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a component for overtravel adjustment of a vacuum circuit breaker. Background Technology

[0002] Circuit breakers, such as vacuum circuit breakers, are crucial switching devices in power systems. They are responsible for connecting or disconnecting the load current of electrical equipment during normal circuit operation; and for reliably interrupting short-circuit currents to protect the system in the event of a power system fault.

[0003] To ensure the circuit breaker can stably and reliably perform current switching operations and maintain a long mechanical life, a contact pressure spring is installed on the moving contact. When the circuit breaker is in the closed state, the contact pressure spring stores energy. This allows the moving contact to quickly separate from the stationary contact under the action of the spring force when the circuit breaker opens, improving the speed and reliability of the opening process.

[0004] Furthermore, in the closed state, to ensure a low contact resistance between the moving and stationary contacts, the contact pressure spring undergoes a certain amount of compression, known as "overtravel." Specifically, overtravel refers to the distance the contact pressure spring is further compressed after the moving and stationary contacts have already made contact within the vacuum interrupter during the closing process. This design increases the contact pressure between the moving and stationary contacts, helping to ensure reliable current switching and extending the circuit breaker's service life.

[0005] In existing ring main unit switch designs, the vast majority of switches lack overtravel adjustment functionality. The current mainstream overtravel adjustment technology employs an overtravel adjuster with threads on both the inner and outer sides, which connects the insulating pull rod to the contact spring assembly. Specifically, the outer thread of the adjuster connects to and locks with the spring pressing shaft, while the inner thread engages with the insulating pull rod. By rotating the spring pressing shaft, relative movement between the pull rod and the inner thread of the overtravel adjuster is achieved, thus completing the overtravel adjustment. However, this structure has significant technical limitations: when the pull rod experiences a slight misalignment, the threaded connection is prone to jamming, leading not only to low assembly efficiency but also potential thread damage under forced installation conditions. Therefore, this design exhibits poor efficiency and reliability during actual assembly.

[0006] Therefore, this invention proposes a component for overtravel adjustment of vacuum circuit breakers to solve the above problems. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a component for overtravel adjustment of vacuum circuit breakers, which has overtravel adjustment function and anti-jamming ability, ensuring smooth operation during installation and overtravel adjustment, thereby achieving a simple and efficient overtravel adjustment effect.

[0008] To solve the above-mentioned technical problems, the technical solution of this utility model is: a component for overtravel adjustment of a vacuum circuit breaker, used to connect a cam and a moving contact rod, the innovation of which is: the component includes an overtravel spring cylinder, an overtravel spring, an overtravel spring adjusting guide rod, and an overtravel spring limiting nut;

[0009] The top of the overtravel spring cylinder is connected to the cam, the overtravel spring is placed inside the overtravel spring cylinder and sleeved on the upper end of the overtravel spring adjusting guide rod, the overtravel spring limiting nut is movably sleeved on the outside of the overtravel spring adjusting guide rod and threadedly connected to the overtravel spring cylinder, the overtravel spring adjusting guide rod has a boss, the boss is located between the overtravel spring and the overtravel spring limiting nut, one end of the overtravel spring abuts against the top of the overtravel spring cylinder, and the other end contacts the boss;

[0010] The overtravel spring adjusting guide rod is connected to the moving contact pull rod through a flexible fastening conduit. The overtravel spring adjusting guide rod is threadedly connected to the flexible fastening conduit. By rotating the overtravel spring adjusting guide rod, the overtravel spring adjusting guide rod can be moved up and down, which in turn moves the boss up and down to compress or relax the overtravel spring.

[0011] Furthermore, the overtravel spring adjusting guide rod is relatively fixed by the guide rod fastening nut and the flexible connection fastening guide tube.

[0012] Furthermore, the lower end of the overtravel spring adjusting guide rod has an external thread section, which is inserted into the flexible connection fastening conduit and threadedly connected to the flexible connection fastening conduit. The guide rod fastening nut is set between the overtravel spring cylinder and the flexible connection fastening conduit and is threadedly connected to the external thread section.

[0013] Furthermore, the inner circumferential surface of the overtravel spring sleeve forms a clearance fit with the outer circumferential surface of the overtravel spring, and the inner circumferential surface of the overtravel spring forms a clearance fit with the outer circumferential surface of the overtravel spring adjusting guide rod.

[0014] Furthermore, the clearance between the overtravel spring and the overtravel spring adjusting guide rod is smaller than the clearance between the boss of the overtravel spring adjusting guide rod and the overtravel spring cylinder.

[0015] Furthermore, the overtravel spring sleeve has several vent holes.

[0016] Furthermore, the overtravel spring adjusting guide rod is equipped with a locking nut that facilitates rotation of the overtravel spring adjusting guide rod.

[0017] The advantages of this utility model are:

[0018] The component of this utility model achieves overtravel adjustment by rotating the overtravel spring adjusting guide rod, which moves the overtravel spring adjusting guide rod up and down. The boss compresses and relaxes the overtravel spring inside the overtravel spring cylinder. The whole operation is convenient, quick and smooth, and achieves a simple and efficient overtravel adjustment effect.

[0019] The overtravel spring adjusting guide rod of this utility model is relatively fixed by the guide rod fastening nut and the flexible connection fastening guide tube, which effectively prevents the overtravel spring adjusting guide rod from being misaligned or loosened due to external force.

[0020] The overtravel spring adjusting guide rod of this utility model has an external thread section. The overtravel spring adjusting guide rod is threadedly connected to the flexible connection fastening guide tube through the external thread section, and the guide rod fastening nut is threadedly connected to the external thread section. By tightening the guide rod fastening nut, the guide rod fastening nut is pressed against the flexible connection fastening guide tube, which not only prevents the overtravel spring adjusting guide rod from being misaligned or loose, but also ensures that the overtravel position is accurately limited.

[0021] The inner circumferential surface of the overtravel spring sleeve of this invention forms a clearance fit with the outer circumferential surface of the overtravel spring, and the inner circumferential surface of the overtravel spring forms a clearance fit with the outer circumferential surface of the overtravel spring adjusting guide rod, thereby ensuring circumferential free movement allowance among the overtravel spring, the overtravel spring sleeve, and the overtravel spring adjusting guide rod.

[0022] In this invention, the clearance between the overtravel spring and the overtravel spring adjusting guide rod is smaller than the clearance between the boss of the overtravel spring adjusting guide rod and the overtravel spring cylinder. This design can effectively prevent the overtravel spring from shifting significantly during the pre-compression process.

[0023] This invention, by opening several vent holes on the overtravel spring cylinder, ensures that the rapidly compressed air inside the overtravel spring cylinder can be smoothly discharged during the closing and opening process, avoiding any impact on the mechanical properties. It also facilitates the discharge of electroplating solution during the electroplating process of the overtravel spring cylinder, reducing internal residue, lowering the internal roughness of the overtravel spring cylinder, and improving processing efficiency and ease of operation.

[0024] This invention features a locking nut mounted on the overtravel spring adjusting guide rod, making it convenient for operators to rotate the overtravel spring adjusting guide rod. Attached Figure Description

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 This is a schematic diagram showing the connection between the components of this utility model and the cam and the moving contact rod.

[0027] Figure 2 This is a cross-sectional view of the component for overtravel adjustment of a vacuum circuit breaker according to the present invention. Detailed Implementation

[0028] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0029] Example

[0030] This embodiment provides a component for overtravel adjustment of a vacuum circuit breaker, used to connect the cam 21 and the moving contact rod, such as... Figure 1 As shown, the moving contact rod is installed in the vacuum interrupter 3, and the vacuum interrupter 3 is also equipped with a stationary contact rod. The stationary contact rod is connected to the end of the stationary contact, and the moving contact rod is connected to the end of the moving contact. The end of the moving contact rod is connected to the overtravel adjustment component 1, which is connected to the cam 2. During operation, the cam 2 is driven by the operating mechanism and the circuit breaker main shaft 23. Through rotational motion, the moving contact rod is driven up and down by the overtravel adjustment component 1, thereby enabling the moving contact and the stationary contact to make contact or separate, completing the closing and opening operations of the circuit breaker.

[0031] like Figure 2 As shown, the overtravel adjustment component 1 includes an overtravel spring sleeve 11, an overtravel spring 12, an overtravel spring adjustment guide rod 13, and an overtravel spring limit nut 14.

[0032] The overtravel spring cylinder 11 has a vertically oriented central axis. The bottom of the overtravel spring cylinder 11 has an opening for the upper end of the overtravel spring adjusting guide rod 13 to extend into it. The top of the overtravel spring cylinder 11 is connected to the cam 2. The central axis of the overtravel spring adjusting guide rod 13 is vertically oriented below the overtravel spring cylinder 11. The upper end of the overtravel spring adjusting guide rod 13 extends into the overtravel spring cylinder 11 through the opening. The overtravel spring 12 is placed inside the overtravel spring cylinder 11 and sleeved on the upper end of the overtravel spring adjusting guide rod 13. The overtravel spring limiting nut 14 passes through the lower end of the overtravel spring adjusting guide rod 13 and is movably sleeved on the outside of the overtravel spring adjusting guide rod 13. The overtravel spring limiting nut 14 has an external thread. The overtravel spring limiting nut 14 covers the opening of the overtravel spring cylinder 11 and is threadedly connected to the overtravel spring cylinder 11. The bottom surface of the overtravel spring limiting nut 14 is flush with the bottom surface of the overtravel spring cylinder 11. The upper end of the overtravel spring adjusting guide rod 13 has a circular boss 17. The boss 17 is located between the overtravel spring 12 and the overtravel spring limiting nut 14. One end of the overtravel spring 12 abuts against the top of the overtravel spring cylinder 11, and the other end contacts the boss 17, thereby realizing the stop and limit function of the overtravel spring 12 on the overtravel spring adjusting guide rod 13.

[0033] In this embodiment, the inner circumferential surface of the overtravel spring sleeve 11 and the outer circumferential surface of the overtravel spring 12 form a clearance fit, and the inner circumferential surface of the overtravel spring 12 and the upper outer circumferential surface of the overtravel spring adjusting guide rod 13 form a clearance fit, thereby ensuring circumferential free movement allowance among the overtravel spring 12, the overtravel spring sleeve 11, and the overtravel spring adjusting guide rod 13. Furthermore, the clearance between the overtravel spring 12 and the upper end of the overtravel spring adjusting guide rod 13 is smaller than the clearance between the boss 17 of the overtravel spring adjusting guide rod 13 and the overtravel spring sleeve 11, thereby effectively preventing large displacement of the overtravel spring 12 during pre-compression.

[0034] In the design of the overtravel spring cylinder 11, due to the rapid closing and opening speed, a sealed space is formed inside the overtravel spring cylinder 11, causing air to be rapidly compressed, which may adversely affect the mechanical properties. Simultaneously, the electroplating solution is difficult to drain smoothly during processing, resulting in internal residue, thereby increasing the internal roughness of the overtravel spring cylinder 11 and further affecting its mechanical performance. Therefore, in this embodiment, the overtravel spring cylinder 11 has several vent holes 16, which not only ensures that the rapidly compressed air during the closing and opening process can be smoothly discharged, avoiding any impact on the mechanical properties, but also facilitates the flow of the electroplating solution during processing, further improving processing efficiency and operational convenience.

[0035] The overtravel spring adjusting guide rod 13 is connected to the moving contact pull rod via the flexible connection fastening conduit 33, and is threadedly connected to the flexible connection fastening conduit 33. To prevent the overtravel spring adjusting guide rod 13 from misaligning or loosening due to external force, it is relatively fixed to the flexible connection fastening conduit 33 via the guide rod fastening nut 15. The lower end of the overtravel spring adjusting guide rod 13 has an external thread section, which is inserted into the flexible connection fastening conduit 33 and threadedly connected to it. The guide rod fastening nut 15 is located between the overtravel spring cylinder 11 and the flexible connection fastening conduit 33 and is threadedly connected to the external thread section. By tightening the guide rod fastening nut 15, it presses against the flexible connection fastening conduit 33, which not only prevents the overtravel spring adjusting guide rod 12 from misaligning or loosening but also ensures precise overtravel positioning.

[0036] In this embodiment, the overtravel spring adjusting guide rod 13 is equipped with a locking nut 18 for easy rotation of the overtravel spring adjusting guide rod 13. When adjusting the overtravel, the operator loosens the guide rod fastening nut 15 and uses a wrench to rotate the locking nut 18, which drives the overtravel spring adjusting guide rod 13 to rotate, thereby moving the overtravel spring adjusting guide rod 13 up and down. This causes the boss 17 to move up and down to compress or relax the overtravel spring 13, thus achieving precise adjustment of the overtravel. The entire operation is convenient, quick, and without jamming, achieving a simple and efficient overtravel adjustment effect.

[0037] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A component for overtravel adjustment of a vacuum circuit breaker, used to connect a cam and a moving contact rod, characterized in that: The component includes an overtravel spring cylinder, an overtravel spring, an overtravel spring adjusting guide rod, and an overtravel spring limiting nut; The top of the overtravel spring cylinder is connected to the cam, the overtravel spring is placed inside the overtravel spring cylinder and sleeved on the upper end of the overtravel spring adjusting guide rod, the overtravel spring limiting nut is movably sleeved on the outside of the overtravel spring adjusting guide rod and threadedly connected to the overtravel spring cylinder, the overtravel spring adjusting guide rod has a boss, the boss is located between the overtravel spring and the overtravel spring limiting nut, one end of the overtravel spring abuts against the top of the overtravel spring cylinder, and the other end contacts the boss; The overtravel spring adjusting guide rod is connected to the moving contact pull rod through a flexible fastening conduit. The overtravel spring adjusting guide rod is threadedly connected to the flexible fastening conduit. By rotating the overtravel spring adjusting guide rod, the overtravel spring adjusting guide rod can be moved up and down, which in turn moves the boss up and down to compress or relax the overtravel spring.

2. The component for overtravel adjustment of a vacuum circuit breaker according to claim 1, characterized in that: The overtravel spring adjusting guide rod is relatively fixed by the guide rod fastening nut and the flexible connection fastening guide tube.

3. The component for overtravel adjustment of a vacuum circuit breaker according to claim 2, characterized in that: The lower end of the overtravel spring adjusting guide rod has an external thread section, which is inserted into the flexible connection fastening conduit and threadedly connected to the flexible connection fastening conduit. The guide rod fastening nut is set between the overtravel spring cylinder and the flexible connection fastening conduit and is threadedly connected to the external thread section.

4. The component for overtravel adjustment of a vacuum circuit breaker according to claim 1, characterized in that: The inner circumferential surface of the overtravel spring sleeve and the outer circumferential surface of the overtravel spring form a clearance fit, and the inner circumferential surface of the overtravel spring and the outer circumferential surface of the overtravel spring adjusting guide rod form a clearance fit.

5. The component for overtravel adjustment of a vacuum circuit breaker according to claim 4, characterized in that: The clearance between the overtravel spring and the overtravel spring adjusting guide rod is smaller than the clearance between the boss of the overtravel spring adjusting guide rod and the overtravel spring cylinder.

6. The component for overtravel adjustment of a vacuum circuit breaker according to claim 1, characterized in that: The overtravel spring sleeve has several vent holes.

7. The component for overtravel adjustment of a vacuum circuit breaker according to claim 1, characterized in that: The overtravel spring adjusting guide rod is equipped with a locking nut that facilitates rotation of the overtravel spring adjusting guide rod.

Images