Multi-layer bundled extra-large current contacts

Abstract

This utility model belongs to the field of power equipment technology and discloses a multi-layered, bundled, ultra-high current contact, including a contact body support, multiple layers of contact plates, and multiple springs. The contact body support is composed of two circular support plates connected by fasteners. The contact plates are divided into at least two layers, with each layer arranged on different circumferences of the support plate. Each layer of contact plates has a spring slot on its outer side, and the springs are respectively locked in the corresponding spring slots. Each layer of contact plates provides contact pressure through independent spring binding. By arranging multiple layers of contact plates, the number of contact plates is significantly increased within the same installation space, thereby greatly reducing the current load of a single contact and reducing heat generation. Each layer of contact plates has an independently set spring, and gaps are left between layers, forming natural air circulation channels that do not interfere with each other, facilitating heat dissipation and greatly increasing the current carrying capacity.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and more specifically, to a multi-layered, bundled, extra-large current contact. Background Technology

[0002] With the rapid promotion and widespread application of new energy technologies, the number of electrical devices in power systems has increased significantly, and the electrical load has continued to rise, placing higher demands on high-current transmission and connection technologies. Especially in the primary conductive circuits of high and low voltage switchgear (commonly known as switchgear), the maximum rated current of withdrawable high-voltage switchgear (such as those with voltage levels above 6kV) has now reached 5000A, and according to power industry standards, it is even required to reach 5500A. The withdrawable components of this type of switchgear (usually circuit breakers) are connected to the stationary contacts inside the cabinet via moving contact arms, and their performance directly affects the conductivity reliability, temperature rise control, and operational safety of the equipment.

[0003] Currently, the single-layer bundled circular contact structure commonly used in the industry consists of several contact pieces evenly arranged around the outer circumference of a circular support, with contact pressure provided by external springs. Typical products use 109mm diameter circular copper for the stationary contact, with a single layer typically containing 84 contact pieces, approaching the physical limit of current structural designs. With this configuration, each contact must handle approximately 48A of current, and about 90% of the temperature rise in the contact system originates from contact heating.

[0004] Although this structure can basically meet the requirements for use under rated current conditions of 3150A and below, and can be barely extended to 4000A with the assistance of forced air cooling, it has the following significant drawbacks: 1. The number of contacts and current carrying capacity have reached their limits: Due to the single-layer circumferential arrangement, the number of contacts cannot be further increased, resulting in excessively high current load per unit contact and significant heat generation, which restricts the application of contacts in high-current applications of 5000A and above. Currently, the industry lacks mature and reliable 5000A-class contact products. Most solutions still rely on 4000A contacts and use forced air cooling, heat pipes, or even water cooling systems for heat dissipation, which is not only complex and costly but also significantly increases the system failure rate.

[0005] 2. Deterioration of Thermo-Mechanical Coupling and Decreased Reliability: Due to the lack of current margin in the contact design, long-term high-load operation will lead to a continuous high-temperature environment, which can easily cause stress relaxation and elasticity decay of the binding spring, thereby reducing the contact pressure between the contacts. The pressure drop further exacerbates the increase in contact resistance and heat generation, forming a vicious cycle of positive feedback. Ultimately, this may lead to serious accidents such as spring breakage, contact burnout, decreased insulation performance, or even short circuit explosion. Several related failure cases have occurred in actual operation.

[0006] Therefore, there is an urgent need for a new type of high-current contact structure that can increase the number of effective contacts, improve current distribution, suppress temperature rise, and have higher mechanical and thermal stability to meet the long-term needs of high-reliability switching equipment in high-current applications of 5000A and above. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-layered, bundled, ultra-high current contact.

[0008] To solve the above problems, the present invention adopts the following technical solution: Multi-layered, bundled, extra-high current contact, comprising a contact body support, multiple layers of contact plates, and multiple springs; The contact body support is composed of two circular support plates connected by fasteners; The contact piece is divided into at least two layers, with each layer of contact pieces arranged on different circumferences of the support plate; Each contact layer has a spring slot on its outer side, and the springs are respectively locked in the corresponding spring slots. Each contact layer is provided with contact pressure by independent spring binding.

[0009] As a further description of the above technical solution: the contact piece includes an inner contact piece and an outer contact piece, the inner contact piece is limited by a support plate, and the outer contact piece is limited by a mating structure on the support plate and the inner contact piece.

[0010] As a further description of the above technical solution: the bracket plate is provided with a plurality of slots, and the inner side of the inner contact piece is provided with a limiting slot, and the inner contact piece is secured in the slot of the bracket plate through the limiting slot.

[0011] As a further description of the above technical solution: the outer side of the inner contact piece is provided with a groove, the inner side of the outer contact piece is provided with a boss, the boss is inserted into the groove, and the outer contact piece is limited by the cooperation of the bracket plate and the concave and convex parts on the inner and outer contact pieces.

[0012] As a further description of the above technical solution: the spring is made of high-strength alloy material, and the connecting fastener is a bolt.

[0013] As a further description of the above technical solution: the springs on each layer of the contact piece are staggered.

[0014] Compared with existing technologies, the advantages of this utility model are: First, by arranging multiple contact pieces, the number of contact pieces is significantly increased within the same installation space, thereby greatly reducing the current load of a single contact and reducing heat generation.

[0015] Second, each layer of contact piece is independently equipped with a spring, and gaps are left between the layers to form a natural air circulation channel. They do not interfere with each other, which is conducive to heat dissipation and greatly increases the current carrying capacity.

[0016] Third, it has strong scalability and can flexibly increase the number of layers according to current demand to form a three-layer or more layer structure, so as to linearly increase the current carrying capacity or margin. It is flexible in design and has a wide range of applications.

[0017] IV. This utility model is applicable to high current applications of 4000A-5500A and above, with high reliability and long service life. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This utility model Figure 1 Top view; Figure 3 This utility model Figure 1 Side view section; Figure 4 This is a schematic diagram of the structure of the inner contact piece of this utility model; Figure 5 This is a schematic diagram of the structure of the outer contact piece of this utility model; Figure 6 This is a schematic diagram of the structure of the support plate of this utility model; Figure 7 This is a schematic diagram of the structure connecting the multi-layered, extra-large current contact of this utility model to the stationary contact inside the switch cabinet.

[0019] Explanation of the labels in the diagram: 1. Contact body support; 11. Support plate; 111. Slot; 12. Connecting fastener; 2. Contact piece; 21. Inner contact piece; 211. Limiting slot; 212. Groove; 22. Outer contact piece; 221. Boss; 3. Spring; 31. Spring slot. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model. Example

[0021] Please see Figure 1-7The multi-layered, high-current contact includes a contact body support 1, multiple contact plates 2, and multiple springs 3. The contact body support 1 is the supporting skeleton of the entire contact, consisting of two circular support plates 11 connected by fasteners 12 (bolts in this embodiment), resulting in a stable structure. The contact plates 2 are divided into at least two layers, with each layer of contact plates 2 arranged on different circumferences of the support plate 11. Each layer of contact plates 2 has a spring slot 31 on its outer side, and springs 3 are respectively engaged in the corresponding spring slots 31. Each layer of contact plates 2 is bound together by an independent spring 3 to provide contact pressure.

[0022] The spring 3 is made of high-strength alloy material, which has good fatigue resistance. The springs 3 on each layer of contact piece 2 are staggered to optimize stress distribution and heat dissipation. Example

[0023] This embodiment is a further improvement based on Embodiment 1. Compared with Embodiment 1: like Figure 3 As shown, the contact 2 includes an inner contact 21 and an outer contact 22 (it can also be designed as two or more layers depending on the actual current flow requirements). The inner contact 21 is limited by the support plate 11, and the outer contact 22 is limited by the support plate 11 and the mating structure on the inner contact 21.

[0024] Specifically: such as Figure 3 , 4 As shown in Figure 6, a plurality of slots 111 are provided on the bracket plate 11, and a limiting slot 211 is provided on the inner side of the inner contact piece 21, and the inner contact piece 21 is locked in the slot 111 of the bracket plate 11 through the limiting slot 211.

[0025] like Figure 4 , 5 As shown, the inner contact 21 has a groove 212 on its outer side, and the outer contact 22 has a boss 221 on its inner side. The boss 221 is inserted into the groove 212, and the outer contact 22 is limited by the bracket plate 11 and the concave and convex parts on the inner and outer contacts.

[0026] Working principle: During installation, first, the inner contact piece 21 is inserted into the slot 111 of the bracket plate 11, and then secured with the spring 3; subsequently, the outer contact piece 22 is aligned with the inner contact piece 21 using the concave-convex structure, and finally, the spring 3 is secured to the outer layer. The springs 3 of each layer can be staggered to optimize the overall structural strength and heat dissipation effect. The springs 3 are made of high-strength alloy material to ensure good elasticity even under long-term high temperatures.

[0027] For example, taking a rated current of 4000A as an example, the stationary contact diameter is 109mm and the contact thickness is 3mm, allowing for the installation of at least 144 contact pieces, each carrying only 28A of current, significantly reducing temperature rise. For 5000A applications, two layers of 84 pieces each can be arranged, totaling 168 pieces, each carrying 30A, significantly reducing heat generation and ensuring stable and reliable operation.

[0028] This invention can also add a third or even more layers of contact pads 2 according to actual needs to further enhance the current carrying capacity.

[0029] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A multi-layer bundled supercurrent contact, characterized by: It includes a contact body support (1), a multi-layer contact plate (2), and multiple springs (3); The contact body support (1) is composed of two circular support plates (11) connected by a fastener (12); The contact piece (2) is divided into at least two layers, and each layer of contact piece (2) is arranged on different circumferences of the support plate (11); Each contact piece (2) has a spring slot (31) on its outer side. The springs (3) are respectively locked in the corresponding spring slots (31). Each contact piece (2) is provided with contact pressure by being bound by an independent spring (3).

2. The multi-layer bundled supercurrent contact of claim 1, wherein: The contact piece (2) includes an inner contact piece (21) and an outer contact piece (22). The inner contact piece (21) is limited by a support plate (11), and the outer contact piece (22) is limited by a mating structure on the support plate (11) and the inner contact piece (21).

3. The multi-layer bundled extra-large current contact according to claim 2, characterized in that: The bracket plate (11) has several slots (111), and the inner side of the inner contact piece (21) has a limiting slot (211). The inner contact piece (21) is locked in the slot (111) of the bracket plate (11) through the limiting slot (211).

4. The multi-layer bundled extra-large current contact according to claim 2, characterized in that: The inner contact (21) has a groove (212) on its outer side, and the outer contact (22) has a boss (221) on its inner side. The boss (221) is inserted into the groove (212), and the outer contact (22) is limited by the bracket plate (11) and the concave and convex parts on the inner and outer contacts.

5. The multi-layer bundled supercurrent contact of claim 1, wherein: The spring (3) is made of high-strength alloy material, and the connecting fastener (12) is a bolt.

6. The multi-layer bundled supercurrent contact of claim 1, wherein: The springs (3) on each of the contact pieces (2) are staggered.

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