Modular contact transmission structure for vacuum circuit breaker

Abstract

The utility model belongs to vacuum circuit breaker technical field, and disclose modularization contact transmission structure for vacuum circuit breaker, including transmission connecting rod among being equipped in vacuum circuit breaker, the end position of transmission connecting rod is connected with insulating pull rod through hinged component, the end of insulating pull rod is connected with change straight mechanism, change straight mechanism is connected with movable contact, movable contact is set up with contact cover, the entry of contact cover is provided with guide ring, and hinged component is through the collaborative design of axle rod, guide bush, butterfly spring, spiral oil groove, and butterfly spring " opens up " the cooperation surface of guide bush and transmission connecting rod with sustained pre-tightening force, when the gap is produced when the hinge place wears, and spring elasticity can actively offset the influence of gap, ensure the synchronism of connecting rod swing and insulating pull rod displacement, movable contact opening and closing position precision error is smaller, and the arc spring piece of guide ring can compensate the module coaxiality deviation or movable contact slight deflection of many broken circuit breakers.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum circuit breaker technology, specifically a modular contact transmission structure for vacuum circuit breakers. Background Technology

[0002] Vacuum circuit breakers are core equipment in power systems for circuit switching control and fault protection. Their modular contact transmission structure, through the coordinated operation of components such as transmission links, insulating rods, and straightening mechanisms, converts the power of the operating mechanism into the linear motion of the moving contacts, thereby completing the opening and closing operations. However, some design flaws in the existing transmission structure severely restrict the transmission accuracy, reliability, and operation and maintenance efficiency of the equipment, becoming a technical bottleneck that urgently needs to be solved.

[0003] Traditional structures often employ a "direct pin-to-connecting rod hole" configuration. Due to long-term friction, a 0.1-0.5mm clearance easily develops at the hinge point between the transmission connecting rod and the insulating tie rod. This clearance leads to decreased transmission accuracy, causing lag and deviation between the connecting rod's swing and the insulating tie rod's displacement, which in turn causes problems such as uneven wear of the moving contact and uneven arc erosion in the arc-extinguishing chamber. For example, CN219677134U discloses a main conductive circuit of a vacuum circuit breaker and the vacuum circuit breaker itself. The main conductive circuit of the vacuum circuit breaker includes a moving contact, a stationary contact, a moving conductive rod, a stationary conductive rod, a first conductive support, and a second conductive support. The moving conductive rod connects the moving contact and the first conductive support, and the stationary conductive rod connects the stationary contact and the second conductive support. The first conductor support and / or the second conductive support include a heat dissipation support component. The heat dissipation support component includes a first flange, a cylindrical structure, a second flange, and at least two heat sinks. The first flange, the cylindrical structure, and the second flange are connected sequentially. At least two heat sinks are spaced apart on the outer surface of the cylindrical structure.

[0004] Therefore, a modular contact drive structure for vacuum circuit breakers is proposed to address the above problems. Utility Model Content

[0005] To address the problems mentioned in the background art, this utility model provides a modular contact transmission structure for vacuum circuit breakers, which has the advantages of gap self-compensation, low friction and long service life, deviation self-adaptation, precise guidance, and buffer protection.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a modular contact transmission structure for a vacuum circuit breaker, including a transmission link disposed in the vacuum circuit breaker, an insulating pull rod connected to the end of the transmission link via a hinge assembly, a straightening mechanism connected to the end of the insulating pull rod, a moving contact connected to the straightening mechanism, a contact sleeve fitted on the moving contact, and a guide ring provided at the entrance of the contact sleeve;

[0007] The hinge assembly includes a shaft with transmission connecting rods fixedly connected at both ends. A guide sleeve is fitted on the outer side of the shaft. An insulating pull rod is fixedly connected to the outer wall of the guide sleeve. A butterfly spring is attached to both ends of the guide sleeve and is sleeved on the shaft.

[0008] Preferably, the top of the contact sleeve is connected to a bellows, and the top of the moving contact passes through the bellows.

[0009] Preferably, the guide ring includes an upper ring body and a lower ring body that are corresponding to each other, and uniformly distributed arc-shaped spring pieces are fixedly connected between the upper ring body and the lower ring body.

[0010] Preferably, the top of the upper ring body is fixedly connected to the head sleeve, and a uniformly distributed support rod is fixedly connected between the upper ring body and the lower ring body.

[0011] Preferably, a conical guide groove is provided at the bottom end of the inner wall of the lower ring.

[0012] Preferably, the inner wall of the guide sleeve is provided with a spiral oil groove.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. The hinge assembly of this utility model uses the coordinated design of shaft, guide sleeve, butterfly spring and spiral oil groove. The butterfly spring "opens" the mating surface between the guide sleeve and the transmission link with a continuous preload. When the hinge joint has a gap due to wear, the spring force can actively offset the effect of the gap, ensuring the synchronization of the link swing and the displacement of the insulating tie rod. The opening and closing position accuracy error of the moving contact is small. The spiral oil groove on the inner wall of the guide sleeve can evenly store grease. Combined with the wear-resistant surface treatment of the shaft, the friction coefficient at the hinge joint is reduced and the wear rate is reduced.

[0015] 2. The guide ring of this utility model is composed of an upper ring body, a lower ring body, an arc-shaped spring piece, and a conical guide groove. The arc-shaped spring piece between the upper and lower ring bodies can compensate for the coaxiality deviation of the modules of the multi-break circuit breaker or the slight deflection of the moving contact. The arc-shaped spring piece can absorb the impact load of opening and closing, and avoid the bellows from failing due to fatigue cracking. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional structural diagram showing the position of the hinge assembly of this utility model;

[0018] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A;

[0019] Figure 4This is a schematic diagram of the hinge assembly of this utility model;

[0020] Figure 5 This is a schematic diagram of the guide ring of this utility model.

[0021] In the diagram: 1. Transmission connecting rod;

[0022] 2. Hinge assembly; 201. Shaft; 202. Guide sleeve; 203. Disc spring; 204. Spiral oil groove;

[0023] 3. Insulating tie rod; 4. Straightening mechanism; 5. Moving contact; 6. Contact sleeve;

[0024] 7. Guide ring; 701. Upper ring body; 702. Lower ring body; 703. Arc-shaped spring piece; 704. Support rod; 705. Conical guide groove. Detailed Implementation

[0025] 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.

[0026] like Figures 1 to 5 As shown, this utility model provides a modular contact transmission structure for a vacuum circuit breaker, including a transmission link 1 disposed in the vacuum circuit breaker. An insulating pull rod 3 is connected to the end of the transmission link 1 through a hinge assembly 2. A straightening mechanism 4 is connected to the end of the insulating pull rod 3. A moving contact 5 is connected to the straightening mechanism 4. A contact sleeve 6 is sleeved on the moving contact 5. A guide ring 7 is provided at the entrance of the contact sleeve 6.

[0027] The hinge assembly 2 includes a shaft 201 with both ends fixedly connected to the transmission connecting rod 1. A guide sleeve 202 is sleeved on the outer side of the shaft 201. The spiral oil groove 204 opened on the inner wall of the guide sleeve 202 can evenly store grease. Combined with the wear-resistant surface treatment of the shaft 201, the friction coefficient at the hinge is reduced, wear is reduced and service life is extended. An insulating pull rod 3 is fixedly connected to the outer wall of the guide sleeve 202. A butterfly spring 203 is attached to both ends of the guide sleeve 202. The butterfly spring 203 can actively compensate for the gap caused by wear at the hinge, ensure the synchronization of the swing of the connecting rod and the displacement of the insulating pull rod 3, and improve the transmission accuracy. The butterfly spring 203 is sleeved on the shaft 201.

[0028] Specifically, the top of the contact sleeve 6 is connected to a bellows, and the top of the moving contact 5 passes through the bellows. The bellows plays a role in vacuum sealing, while allowing the moving contact 5 to move axially, ensuring the vacuum level of the vacuum interrupter to ensure the arc extinguishing effect.

[0029] Furthermore, the guide ring 7 includes an upper ring body 701 and a lower ring body 702 corresponding to each other. The upper ring body 701 and the lower ring body 702 are fixedly connected with evenly distributed arc-shaped spring pieces 703. The arc-shaped spring pieces 703 can compensate for the coaxiality deviation of the module of the multi-break circuit breaker or the slight deflection of the moving contact 5, so as to avoid the moving contact 5 from jamming with the guide ring 7 and improve the guiding accuracy.

[0030] Furthermore, the top of the upper ring 701 is fixedly connected to the head sleeve 6, and a uniformly distributed support rod 704 is fixedly connected between the upper ring 701 and the lower ring 702. The support rod 704 enhances the structural rigidity of the guide ring 7 and prevents it from undergoing plastic deformation during long-term use, thereby extending its service life.

[0031] It is worth noting that a conical guide groove 705 is provided at the bottom of the inner wall of the lower ring body 702. The conical guide groove 705 forms a "trumpet mouth" to guide and improve the centering accuracy when the moving contact 5 is inserted, so as to ensure that the arc is stably extinguished in the center of the arc extinguishing chamber and improve the arc extinguishing efficiency.

[0032] It is worth noting that the inner wall of the guide sleeve 202 is provided with a spiral oil groove 204. The spiral oil groove 204 further reduces friction and wear at the hinge by storing oil for lubrication, thus ensuring transmission stability and component life.

[0033] Working principle and process: When the vacuum circuit breaker receives a tripping or closing command, the operating mechanism drives the transmission link 1 to swing accordingly. This power is transmitted to the insulating pull rod 3 through the hinge assembly 2. The shaft 201 is fixed to the end of the transmission link 1, the guide sleeve 202 rotates synchronously with the swing, and the disc spring 203 eliminates the fit gap to ensure that the power is transmitted without lag. The insulating pull rod 3 transmits the power to the straightening mechanism 4. The straightening mechanism 4 converts the swinging motion into linear motion and drives the moving contact 5. The moving contact 5 passes through the guide ring 7, the arc-shaped spring 703 compensates for assembly errors, the support rod 704 enhances the rigidity of the guide ring, and then enters the contact sleeve 6 to achieve precise guidance. The top of the contact breaker passes through the bellows at the top of the contact sleeve 6 to maintain vacuum sealing, and finally completes the contact (closing) or separation (tripping) with the stationary contact of the arc-extinguishing chamber.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A modular contact drive structure for a vacuum circuit breaker, comprising a drive link (1) disposed in the vacuum circuit breaker, characterized in that: The end of the transmission link (1) is connected to an insulating pull rod (3) via a hinge assembly (2). The end of the insulating pull rod (3) is connected to a straightening mechanism (4). The straightening mechanism (4) is connected to a moving contact (5). A contact sleeve (6) is fitted on the moving contact (5). A guide ring (7) is provided at the entrance of the contact sleeve (6). The hinge assembly (2) includes a shaft (201) with both ends fixedly connected to the transmission connecting rod (1). A guide sleeve (202) is sleeved on the outer side of the shaft (201). An insulating pull rod (3) is fixedly connected to the outer wall of the guide sleeve (202). A butterfly spring (203) is attached to both ends of the guide sleeve (202). The butterfly spring (203) is sleeved on the shaft (201). The top of the contact sleeve (6) is connected to a bellows, and the top of the moving contact (5) passes through the bellows.

2. The modular contact drive structure for a vacuum circuit breaker according to claim 1, characterized in that: The guide ring (7) includes an upper ring body (701) and a lower ring body (702) that are corresponding to each other. The upper ring body (701) and the lower ring body (702) are fixedly connected with uniformly distributed arc-shaped spring pieces (703).

3. The modular contact drive structure for a vacuum circuit breaker according to claim 2, characterized in that: The top of the upper ring (701) is fixedly connected to the head sleeve (6), and a uniformly distributed support rod (704) is fixedly connected between the upper ring (701) and the lower ring (702).

4. The modular contact drive structure for a vacuum circuit breaker according to claim 2, characterized in that: A conical guide groove (705) is provided at the bottom of the inner wall of the lower ring body (702).

5. The modular contact drive structure for a vacuum circuit breaker according to claim 1, characterized in that: The inner wall of the guide sleeve (202) is provided with a spiral oil groove (204).

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