Bus duct copper-aluminum eutectic connector

Abstract

The utility model discloses a bus duct copper-aluminum eutectic connector, and relates to the technical field of connecting devices. The utility model relates to a bus bar connecting structure, which comprises a plurality of insulating mounting plates arranged between two end covers, a connecting plate is arranged on the insulating mounting plates, the connecting plate comprises a base body layer, the base body layer is an aluminum alloy base body layer, a copper connecting layer is arranged on a connecting surface of the connecting plate corresponding to a bus bar, and a copper-aluminum eutectic layer is arranged between the base body layer and the copper connecting layer. The copper-aluminum eutectic bus duct connector has the beneficial effects that the copper-aluminum eutectic bus duct connector effectively reduces the cost and the weight, optimizes the structural design, enhances the connection reliability while ensuring excellent conductive performance and corrosion resistance, creatively applies the copper-aluminum eutectic technology, and improves the service life of the copper-aluminum eutectic bus duct connector. A high-performance, low-cost and light-weight bus duct connector solution is provided for the power industry, and the bus duct connector has important practical application value and popularization significance.

Description

TECHNICAL FIELD

[0001] The utility model relates to connecting device technical field especially relates to a bus duct copper aluminum eutectic connector. BACKGROUND

[0002] In power transmission and distribution system, bus duct connector is a key component for connecting and distributing electric energy, the connecting sheet on the existing bus duct connector adopts copper connecting sheet or aluminum connecting sheet, copper although resistivity is low, electric energy loss is small, but density is big, cost is high, force enterprise to have to reduce the conductor section to respond, thereby not only reduce the safety performance of bus duct connector, but also increase energy consumption, aluminum conductivity is poor, and the conductivity is about 60% of copper, and the mechanical strength is relatively low, and the corrosion resistance is poor, and is easy to deform and damage, therefore, how to reduce cost and weight while guaranteeing the conductivity and safety becomes an important issue in the design of bus duct connector.

[0003] In order to overcome the deficiency of traditional bus duct connector, in recent years, the application of copper aluminum composite material appears, copper aluminum composite material combines the advantages of copper and aluminum, which has high conductivity, and can reduce cost and weight, however, the existing copper aluminum composite material is basically copper and aluminum directly solid composite, due to the large difference between copper and aluminum in physical and chemical properties, direct combination can produce potential difference because of different materials, thereby easily producing electrochemical corrosion and increasing contact resistance, which affects the performance and service life of the connector.

[0004] With the continuous development of the electric power industry and the continuous improvement of the performance requirements of bus duct connector, the traditional copper aluminum composite material connector has been difficult to meet market demand, so it is urgent to design a new type of bus duct connector.

[0005] Based on this, the applicant proposes a bus duct copper aluminum eutectic connector to solve the above technical problems. UTILITY MODEL CONTENTS

[0006] The utility model provides a bus duct copper aluminum eutectic connector to solve the above technical problems in view of the deficiency in the prior art.

[0007] The utility model solves the above technical problems by the following technical scheme:

[0008] A bus duct copper aluminum eutectic connector, comprising a plurality of insulating mounting plates arranged between two end covers, the insulating mounting plate is provided with a connecting plate, the connecting plate comprises a base layer, the base layer is an aluminum alloy base layer, a copper connecting layer is arranged on the connecting surface of the connecting plate corresponding to the bus bar row, and a copper aluminum eutectic layer is arranged between the base layer and the copper connecting layer.

[0009] Preferably, the thickness of the copper connecting layer is 5% to 35% of the thickness of the connecting plate.

[0010] Preferably, the thickness of the connecting plate is 1mm to 5mm.

[0011] Preferably, the thickness of the copper connecting layer is 0.1mm to 0.5mm.

[0012] Preferably, the insulating mounting plate comprises a single-sided groove insulating mounting plate and a double-sided groove insulating mounting plate, the single-sided groove insulating mounting plate is arranged adjacent to the end cover, and the double-sided groove insulating mounting plate is arranged between the single-sided groove insulating mounting plate and another end cover.

[0013] Preferably, one connecting plate is arranged on the single-sided groove insulating mounting plate, and two connecting plates are symmetrically arranged on the double-sided groove insulating mounting plate.

[0014] Preferably, the end cover is provided with a protrusion at the middle of the side facing the insulating mounting plate.

[0015] Preferably, the end cover is provided with a mounting cavity on the side away from the insulating mounting plate, and a gasket is arranged in the mounting cavity.

[0016] Preferably, after the busbar torque bolt penetrates the end cover, the insulating mounting plate and the connecting plate, the busbar is clamped by tightening the nut at the end.

[0017] Preferably, an insulating sleeve penetrates the end cover, the insulating mounting plate and the connecting plate, and the busbar torque bolt penetrates the insulating sleeve.

[0018] The utility model discloses the beneficial effect lies in:

[0019] 1. Improve the electric conductivity and corrosion resistance: through copper-aluminum eutectic technology, the technology is adopted solid-liquid composite, reaches metallurgical combination between copper and aluminum, and the copper-aluminum eutectic layer is also arranged between the aluminum alloy base layer and the copper connecting layer, realizes the close combination of copper-aluminum material, effectively reduces the contact resistance, improves the electric conductivity, simultaneously, the copper-aluminum eutectic layer has good corrosion resistance, can resist the erosion of electrochemical corrosion, prolongs the service life of connector.

[0020] 2. Reduce the cost and weight: compared with copper connector, the utility model adopts copper-aluminum composite material, significantly reduces the material cost, simultaneously, the light weight characteristic of aluminum material makes the overall weight of connector lightens, is favorable to the lightweight design of electric power system, reduces the difficulty and cost of installation and maintenance.

[0021] 3. Optimized structure design: the insulating mounting plate is divided into single-sided groove and double-sided groove designs, the number of connecting plates can be flexibly configured according to actual needs, the versatility and adaptability of the connector are improved, the convex and mounting cavity design on the end cover enhances the structural strength of the connector, and installation and fixation are facilitated;

[0022] 4. Enhanced connection reliability: the busbar torque bolt is used in combination with the nut to clamp the busbar row, and the use of the insulating sleeve ensures the stability and safety of the connection;

[0023] 5. Innovative material application: the introduction of copper-aluminum eutectic technology solves the interface reaction problem when copper and aluminum are directly combined, realizes good combination between materials, and provides a new idea and solution for the design of the busbar trough connector. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or prior art description will be described below. Obviously, the technical scheme described in combination with the drawings is only some embodiments of the present application, and for those skilled in the art, other embodiments and drawings can be obtained without creative labor on the basis of the embodiments shown in the drawings.

[0025] Figure 1 is a schematic diagram of the three-dimensional structure of the present application.

[0026] Figure 2 is a schematic diagram of the three-dimensional structure of the present application.

[0027] Figure 3 is a sectional view of the three-dimensional structure of the present application.

[0028] Figure 4 is an exploded view of the three-dimensional structure of the present application.

[0029] Figure 5 is a schematic diagram of the end cover three-dimensional structure of the present application.

[0030] Figure 6 is a schematic diagram of the end cover three-dimensional structure of the present application.

[0031] Figure 7 is a schematic diagram of the single-sided groove insulating mounting plate three-dimensional structure of the present application.

[0032] Figure 8 is a sectional view of the single-sided groove insulating mounting plate three-dimensional structure of the present application.

[0033] Figure 9 is a schematic diagram of the double-sided groove insulating mounting plate three-dimensional structure of the present application.

[0034] Figure 10 is the three-dimensional structure sectional view of the double-sided groove insulation mounting plate of the utility model.

[0035] Figure 11 is the three-dimensional structure schematic view of the connecting plate of the utility model.

[0036] Figure 12 is the three-dimensional structure sectional view of the connecting plate of the utility model.

[0037] Figure 13 is the connecting plate hierarchical structure schematic view of the utility model.

[0038] Figure 14 is the three-dimensional structure schematic view of the use state of the utility model.

[0039] Figure 15 is the three-dimensional structure schematic view of the use state of the utility model.

[0040] In the drawing: 1, end cover, 11, protrusion, 12, installation cavity, 2, insulation mounting plate, 21, single-sided groove insulation mounting plate, 22, double-sided groove insulation mounting plate, 3, connecting plate, 31, base layer, 32, copper connecting layer, 33, copper-aluminum eutectic layer, 4, gasket, 5, busbar torque bolt, 6, nut, 7, insulation sleeve. DETAILED DESCRIPTION

[0041] The technical solutions of the embodiments of the utility model will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments described in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the utility model. Embodiment 1:

[0042] As shown in Figures 1 to 15 the utility model discloses a bus duct copper-aluminum eutectic connector, which comprises a plurality of insulation mounting plates 2 arranged between two end covers 1, the insulation mounting plate 2 is provided with a connecting plate 3, the thickness of the connecting plate 3 is 3mm, the connecting plate 3 comprises a base layer 31, the base layer 31 is an aluminum alloy base layer, the connecting plate 3 is provided with a copper connecting layer 32 on the connecting surface corresponding to the busbar row, the thickness of the copper connecting layer 32 is 0.3mm, the base layer 31 and the copper connecting layer 32 are copper-aluminum eutectic layer 33, the thickness of the copper-aluminum eutectic layer 33 is several microns to tens of microns.

[0043] The copper-aluminum eutectic refers to a low-melting-point eutectic alloy formed between copper and aluminum under certain temperature and pressure, which has good wettability and fluidity, can fill the small gap between copper and aluminum, form a firm combination, and has good electrical conductivity and corrosion resistance, thereby improving the overall performance of the connector.

[0044] The insulating mounting plate 2 comprises one single-sided groove insulating mounting plate 21 and four double-sided groove insulating mounting plates 22, the number of the single-sided groove insulating mounting plate 21 and the double-sided groove insulating mounting plate 22 is set according to actual needs, and the single-sided groove insulating mounting plate 21 is arranged adjacent to the end cover 1, the double-sided groove insulating mounting plate 22 is arranged between the single-sided groove insulating mounting plate 21 and another end cover 1, and one connecting plate 3 is arranged on the single-sided groove insulating mounting plate 21, and two connecting plates 3 are symmetrically arranged on the double-sided groove insulating mounting plate 22.

[0045] The connecting cavities for clamping the bus bars are formed between adjacent insulating mounting plates 2, and the connecting cavities for clamping the P1 bus bar in the bus bar are formed between the end cover 1 and the adjacent double-sided groove insulating mounting plate 22.

[0046] The end cover 1 is provided with a protrusion 11 in the middle of one side of the insulating mounting plate 2, a gap is formed between the adjacent single-sided groove insulating mounting plate 21 and the protrusion 11, and the protrusion 11 is matched with the side plate of the bus duct, and the end cover 1 is provided with a mounting cavity 12 on the side away from the insulating mounting plate 2, and a gasket 4 is arranged in the mounting cavity 12, the protrusion 11 and the mounting cavity 12 on the end cover are designed, and the structural strength of the device is enhanced, and the device is convenient to install and fix.

[0047] The insulating sleeve 7 penetrates the end cover 1, the insulating mounting plate 2 and the connecting plate 3, the bus bar torque bolt 5 passes through the insulating sleeve 7, and then the nut 6 is tightened at the end, so that the bus bar is clamped, and the stability and safety of the connection are ensured.

[0048] In another embodiment, a tin connecting layer is further electroplated on the copper connecting layer 32 of the connecting plate 3, and is connected with the bus bar, the surface is prevented from being oxidized after being plated with tin, the corrosion resistance of the connecting part is improved, and the overall durability of the bus duct connector is further improved, the design effectively resists the erosion of the external environment, and the service life of the bus duct connector is prolonged.

[0049] The utility model provides a kind of bus duct copper-aluminum eutectic connector, connecting plate 3 thereon is copper-aluminum eutectic composite material, and a kind of production process of copper-aluminum eutectic composite material is provided, relating to copper plate surface pretreatment, copper plate preheating, solid-liquid composite casting and rolling, composite slab homogenization annealing, cold rolling, secondary annealing and slitting, and the process comprises the following steps:

[0050] Step A: Copper plate surface pretreatment: The copper plate is first subjected to high-pressure washing to quickly remove solid impurities on the surface of the copper plate, then subjected to low-pressure washing for degreasing treatment to remove grease on the surface of the copper plate, then polished by a steel brush device to remove the oxide layer on the surface of the copper plate, and finally dried for standby use;

[0051] Step B: Copper plate preheating: The pretreated copper plate is fixed and sent to the feeding device, and heated to 150-220°C in an oxygen-free environment;

[0052] Step C: Solid-liquid composite casting and rolling: The aluminum ingot is heated to 660-710°C to obtain molten aluminum liquid, then inert gas is introduced near the roller to fill the casting and rolling environment to form an oxygen-free environment, the outer surface temperature of the roller is heated to 85-95°C, cooling liquid is introduced into the roller, and the casting and rolling equipment is started to allow the molten aluminum liquid to contact the treated copper plate in an oxygen-free environment to realize solid-liquid composite oxygen-free continuous casting and rolling, and obtain a copper-aluminum composite plate blank;

[0053] Step D: Homogenization annealing of the composite plate blank: The obtained copper-aluminum composite plate blank is placed in an annealing furnace for homogenization annealing;

[0054] Step E: Cold rolling: The annealed composite plate blank is subjected to secondary rolling to adjust the rolling equipment to obtain the required plate thickness and width, and the final secondary rolling plate thickness is 0.2-16mm, wherein the copper plate thickness is 5-35% of the overall composite plate thickness, and the plate width is 600-1200mm;

[0055] Step F: Secondary annealing: The copper-aluminum composite plate after cold rolling is subjected to secondary annealing;

[0056] Step G: Slitting and cutting.

[0057] In step A, the washing liquid is an alkaline degreasing solution at 50-70°C.

[0058] In step A, the steel brush device not only polishes the oxide layer on the surface of the copper plate, but also increases the surface roughness, increases the copper-aluminum composite area, and thus enhances the adhesion of the composite material.

[0059] In step B, the preheating of the copper plate can increase the atomic thermal activation energy, so that the atoms can obtain sufficient energy for migration in a short time at high temperature to form a thicker eutectic layer, thereby effectively improving the bonding strength of the copper-aluminum composite interface.

[0060] In step C, the inert gas is nitrogen, and the introduction of nitrogen to form an oxygen-free environment can avoid the formation of an oxide layer on the copper plate and aluminum liquid during the composite process due to direct exposure to air, which can prevent the formation of an ideal eutectic layer and adversely affect the peel strength of the material.

[0061] In step C, the cooling liquid is passed through the roller to increase the cooling speed of the casting and rolling, so that smaller grains are formed, and the strength of the material is increased, the rolling speed of the roller is 600-1300mm / min, the temperature of the cooling liquid is 20-30℃, and the cooling speed is 300-1000℃ / s.

[0062] In step C, the composite rate of the solid-liquid composite casting and rolling is 100%.

[0063] In step D, the heating temperature of the homogenization annealing process is 430-510℃, and the annealing time is 4-5h, the homogenization annealing process can reduce the segregation in the grains on both sides of the copper-aluminum alloy, remove the residual stress, and improve the performance of the alloy.

[0064] In step F, the heating temperature of the secondary annealing process is 300-350℃, and the cooling temperature in the annealing furnace is below 80℃, the secondary annealing process can refine the grains, adjust the structure, and eliminate the defects in the structure, since there is a certain internal stress in the rolling process, which can reduce the strength of the composite material, the annealing process can reduce the residual stress, stabilize the size, reduce the deformation and crack tendency, and ensure that the product has good comprehensive mechanical properties and good metallurgical bonding.

[0065] The copper-aluminum eutectic composite material has not been affected by the skin effect of current transmission, and the current-carrying capacity is about 85% of that of a pure copper conductor, compared with a copper bar, the consumption of copper material is reduced, and the production cost is saved.

[0066] The copper-aluminum eutectic composite material produced by the process has high shear strength and peeling strength, can realize metallurgical bonding between the composite metals, form a eutectic layer, and meet the bonding strength of the material, and compared with the existing composite material production method, the preparation method is simpler, more economical and more efficient.

[0067] In the embodiment, in order to obtain a connecting plate 3 meeting the requirements, the related parameters in the copper-aluminum eutectic composite material production process are appropriately adjusted, so that the composite material obtained by processing meets the requirements.

[0068] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the utility model is defined by the appended claims, not the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0069] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature described. The specification can include implicit combinations of explicitly mentioned features and / or explicit combinations of implicitely mentioned features. Each embodiment depends on the explicit combinations of features and / or the implicit combinations of features made specifically within that embodiment, and each such embodiment can be combined with every other such embodiment to create further embodiments.

Claims

1. A busbar trunking copper-aluminum eutectic connector, comprising a plurality of insulating mounting plates (2) disposed between two end caps (1), wherein a connecting plate (3) is disposed on the insulating mounting plate (2), characterized in that: The connecting plate (3) includes a substrate layer (31), which is an aluminum alloy substrate layer. A copper connecting layer (32) is provided on the connecting surface of the busbar on the connecting plate (3). A copper-aluminum eutectic layer (33) is located between the substrate layer (31) and the copper connecting layer (32).

2. The busbar trunking copper-aluminum eutectic connector according to claim 1, characterized in that: The thickness of the copper connecting layer (32) is 5% to 35% of the thickness of the connecting plate (3).

3. The busbar trunking copper-aluminum eutectic connector according to claim 1, characterized in that: The thickness of the connecting plate (3) is 1mm to 5mm.

4. A busbar trunking copper-aluminum eutectic connector according to claim 1, characterized in that: The thickness of the copper connection layer (32) is 0.1mm~0.5mm.

5. A busbar trunking copper-aluminum eutectic connector according to claim 1, characterized in that: The insulating mounting plate (2) includes a single-slot insulating mounting plate (21) and a double-slot insulating mounting plate (22). The single-slot insulating mounting plate (21) is disposed adjacent to the end cap (1), and the double-slot insulating mounting plate (22) is disposed between the single-slot insulating mounting plate (21) and the other end cap (1).

6. A busbar trunking copper-aluminum eutectic connector according to claim 5, characterized in that: One connecting plate (3) is provided on the single-side slot insulating mounting plate (21), and two connecting plates (3) are symmetrically provided on the double-side slot insulating mounting plate (22).

7. A busbar trunking copper-aluminum eutectic connector according to claim 1, characterized in that: The end cap (1) has a protrusion (11) in the middle of the side facing the insulating mounting plate (2).

8. A busbar trunking copper-aluminum eutectic connector according to claim 1, characterized in that: The end cap (1) has a mounting cavity (12) on the side facing away from the insulating mounting plate (2), and a gasket (4) is provided in the mounting cavity (12).

9. A busbar trunking copper-aluminum eutectic connector according to claim 1, characterized in that: After the busbar torque bolt (5) passes through the end cover (1), the insulating mounting plate (2) and the connecting plate (3), the busbar is clamped by tightening the nut (6) at the end.

10. A busbar trunking copper-aluminum eutectic connector according to claim 9, characterized in that: The insulating sleeve (7) passes through the end cap (1), the insulating mounting plate (2) and the connecting plate (3), and the busbar torque bolt (5) passes through the insulating sleeve (7).

Images