Copper-aluminum connecting pipe for megawatt unit

Abstract

The utility model provides a copper -aluminium connecting pipe for megawatt unit relates to electrical connection technical field. Including copper connecting pipe, aluminium connecting pipe, the copper connecting pipe with aluminium connecting pipe inside is provided with connecting pipe hole, copper connecting pipe with aluminium connecting pipe between be provided with copper -aluminium transition joint, copper connecting pipe with aluminium connecting pipe end part is provided with insulating component, copper connecting pipe with aluminium connecting pipe on be provided with sealing assembly and protection component, copper -aluminium transition joint is provided with thermal expansion compensation mechanism in. The utility model absorbs heterogeneous metal expansion stress through thermal expansion compensation mechanism, and multiple components realize insulation, sealing and anti -vibration protection, and the assembly of guiding structure is simplified. Solve traditional copper -aluminium connection heating, corrosion, easy to loosen problem, satisfy megawatt unit high current -carrying, strong vibration working condition demand, improve operating stability and life.

Description

Technical Field

[0001] This utility model relates to the field of copper-aluminum connecting pipes, and more specifically, to a copper-aluminum connecting pipe for megawatt units. Background Technology

[0002] Megawatt-class generator sets, such as wind turbines, solar turbines, and gas turbines, are core equipment in both new energy and traditional power systems. Their internal electrical connections must meet stringent operating conditions, including high current, high reliability, wide temperature range, and strong vibration. Copper-aluminum connecting pipes, as key transitional components between the internal busbars and the external power transmission system, must simultaneously leverage the high conductivity of copper and the lightweight advantages of aluminum, thus becoming one of the core selection criteria for the electrical connections of megawatt-class generator sets.

[0003] The copper-aluminum connecting pipe proposed in application number CN200620100226.X includes an aluminum tube body with blind holes at both ends. A copper sheet layer is provided on the inner wall surface of the blind hole at one end of the tube body, and the copper sheet layer and the corresponding inner wall are fused together in a single, solder-free structure. This utility model integrates a copper sheet layer integrally fused to a monolithic aluminum tube body, ensuring reliable connection without detachment. The overall strength of the tube body is high, preventing breakage upon impact. Existing copper-aluminum connection solutions are difficult to fully meet the high requirements of megawatt-level units and have the following drawbacks requiring improvement: localized overheating is prone to occur under long-term operation at megawatt-level high currents, posing a safety hazard; the coefficient of thermal expansion of copper is approximately 16.5 × 10⁻⁶. -6 At ℃, the coefficient of thermal expansion of aluminum is approximately 23 × 10⁻⁶. -6 The temperature difference between the two exceeds 40%. Existing copper-aluminum connecting pipes lack an effective thermal expansion compensation mechanism and cannot alleviate the structural stress caused by the difference in thermal expansion of the materials.

[0004] Megawatt-class turbines typically operate in extreme outdoor environments, such as strong winds and salt spray in wind power, and high temperatures and dust in photovoltaic power. Traditional copper-aluminum connections often rely on partial wrapping with insulating tape or simple plastic sleeves, which are insufficient for achieving full-dimensional electrical isolation. This can easily lead to creepage and short-circuit accidents due to insulation layer damage. Furthermore, the lack of protective structures exposes the connection points directly to the external environment, making them susceptible to surface damage from impacts and corrosion, thus accelerating connection failure. Therefore, this paper proposes an improved copper-aluminum connection pipe for megawatt-class turbines. Utility Model Content

[0005] The purpose of this utility model is to address the problems raised in the existing background technology. To achieve the above-mentioned purpose, this utility model provides the following technical solution: a copper-aluminum connecting pipe for megawatt-scale power generation units, comprising a copper connecting pipe and an aluminum connecting pipe, wherein connecting pipe holes are formed inside the copper and aluminum connecting pipes, a copper-aluminum transition joint is provided between the copper and aluminum connecting pipes, insulating components are provided at the ends of the copper and aluminum connecting pipes, sealing components and protective components are provided on the copper and aluminum connecting pipes, and a thermal expansion compensation mechanism is provided inside the copper-aluminum transition joint.

[0006] As a preferred technical solution of this utility model, the insulating component includes an insulating sleeve and an insulating end cap, wherein the insulating sleeve is provided with an insulating end cap at its end, and the copper connecting pipe passes through the through hole of the insulating end cap.

[0007] As a preferred technical solution of this utility model, the sealing assembly includes an anti-loosening gasket, a copper end sealing ring, and an aluminum end sealing ring. Both the copper connecting pipe and the aluminum connecting pipe are provided with anti-loosening gaskets. The end of the copper connecting pipe is provided with a copper end sealing ring, and the end of the aluminum connecting pipe is provided with an aluminum end sealing ring.

[0008] As a preferred technical solution of this utility model, the protective component includes an aluminum end corrugated pipe protective sleeve and a copper end corrugated pipe protective sleeve. The aluminum end corrugated pipe protective sleeve is provided on the surface of the aluminum connecting pipe, and the copper end corrugated pipe protective sleeve is provided on the outer surface of the copper connecting pipe.

[0009] As a preferred technical solution of this utility model, the thermal expansion compensation mechanism includes a copper-aluminum thermal expansion compensation cavity and a reserved groove, wherein the reserved groove is provided in the copper-aluminum thermal expansion compensation cavity.

[0010] As a preferred technical solution of this utility model, the copper connecting pipe and the aluminum connecting pipe are provided with a guide assembly assembly, which includes a copper end chamfered sleeve, an aluminum end chamfered sleeve, and a guide cone surface.

[0011] As a preferred technical solution of this utility model, the outer surface of the copper connecting pipe is provided with a copper end chamfer sleeve, the outer surface of the aluminum connecting pipe is provided with an aluminum end chamfer sleeve, and the copper-aluminum transition joint is provided with a guide cone surface.

[0012] As a preferred technical solution of this utility model, an installation bracket is provided on the end side of the aluminum connecting pipe, and the installation bracket is provided with a bracket thread hole.

[0013] As a preferred technical solution of this utility model, the end of the copper-end corrugated pipe protective sleeve is provided with a flange.

[0014] As a preferred technical solution of this utility model, the flange is provided with flange bolt holes.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model achieves a reliable transition between copper and aluminum connecting pipes through a copper-aluminum transition joint, reduces the contact resistance of dissimilar metal interfaces, and avoids electrochemical corrosion; the internal connecting pipe hole provides a smooth current channel, and combined with the precise docking of the guide assembly components, it can stably bear the large current load of megawatt-level units, and solve the problems of heat generation and ablation caused by poor contact in traditional copper-aluminum connections.

[0016] The thermal expansion compensation mechanism within the copper-aluminum transition joint of this utility model effectively absorbs the internal stress caused by the difference in thermal expansion coefficients between copper and aluminum through the synergy of the pre-reserved groove and the copper-aluminum thermal expansion compensation cavity, preventing cracking or loosening of the transition joint and improving reliability under extreme environments. The insulating sleeve and insulating end cap of the insulating component of this utility model achieve full-dimensional electrical isolation, and the anti-loosening gasket of the sealing component effectively improves the sealing performance. The corrugated pipe protective sleeve of this utility model's protective component is impact-resistant and corrosion-resistant, extending its service life. The mounting bracket is rigidly connected to the unit through the bracket's threaded holes, and the bolt holes on the flange reinforce the end fixation, maintaining stability and preventing connection failure due to vibration, thus ensuring continuous operation of the unit.

[0017] This copper-aluminum connecting pipe effectively solves the technical pain points of copper-aluminum connections in megawatt-level units through multi-dimensional optimization in conductivity, thermal compensation, protection, and assembly. It has the advantages of high stability, long service life, and easy maintenance, providing key support for the safe and efficient operation of megawatt-level units. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a partial structural schematic diagram of the present invention; Figure 4 This is a partial structural schematic diagram of the present invention; Figure 5 This is a schematic diagram of the main structure provided for this utility model; Figure 6 A schematic diagram of the guiding assembly component provided by this utility model.

[0019] The image shows: 1. Copper connecting pipe; 2. Aluminum connecting pipe; 3. Connecting pipe hole; 4. Copper-aluminum transition joint; 5. Insulation components: 501. Insulating sleeve; 502. Insulating end cap; 6. Sealing components; 601. Anti-loosening gasket; 602. Copper end sealing ring; 603. Aluminum end sealing ring; 7. Protective components; 701. Aluminum end corrugated pipe protective sleeve; 702. Copper end corrugated pipe protective sleeve; 8. Thermal expansion compensation mechanism; 801. Copper-aluminum thermal expansion compensation cavity; 802. Reserved slot; 9. Guide assembly components; 901. Copper end chamfered sleeve; 902. Aluminum end chamfered sleeve; 903. Guide cone surface; 10. Mounting bracket; 1001. Bracket threaded hole; 11. Flange; 1101. Flange bolt holes. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0021] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely illustrates some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model. It should be noted that, in the absence of conflict, the embodiments and features and technical solutions in the embodiments of this utility model can be combined with each other. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] Example 1: A copper-aluminum connecting pipe for a megawatt generator unit includes a copper connecting pipe 1 and an aluminum connecting pipe 2. Connecting pipe holes 3 are formed inside both the copper and aluminum connecting pipes 1 and 2. A copper-aluminum transition joint 4 is provided between the copper and aluminum connecting pipes 1 and 2. Insulation components 5 are provided at the ends of both the copper and aluminum connecting pipes 1 and 2. Sealing components 6 and protective components 7 are provided on both the copper and aluminum connecting pipes 1 and 2. A thermal expansion compensation mechanism 8 is provided inside the copper-aluminum transition joint 4. The insulation component 5 includes an insulating sleeve 501 and an insulating end cap 502. The insulating end cap 502 is provided at the end of the insulating sleeve 501, and the copper connecting pipe 1 passes through the through hole of the insulating end cap 502. The sealing component 6 includes an anti-loosening gasket 601, a copper end sealing ring 602, and an aluminum end sealing ring 603. Anti-loosening gaskets 601 are provided on both the copper and aluminum connecting pipes 1 and 2. A copper end sealing ring 602 is provided at the end of the copper connecting pipe 1, and an aluminum end sealing ring 603 is provided at the end of the aluminum connecting pipe 2.

[0023] The protective component 7 includes an aluminum-end corrugated pipe protective sleeve 701 and a copper-end corrugated pipe protective sleeve 702. The aluminum-end corrugated pipe protective sleeve 701 is provided on the surface of the aluminum connecting pipe 2, and the copper-end corrugated pipe protective sleeve 702 is provided on the outer surface of the copper connecting pipe 1. The thermal expansion compensation mechanism 8 includes a copper-aluminum thermal expansion compensation cavity 801 and a reserved groove 802. The reserved groove 802 is provided inside the copper-aluminum thermal expansion compensation cavity 801.

[0024] Guide assembly 9 is provided on the copper connecting pipe 1 and the aluminum connecting pipe 2. The guide assembly 9 includes a copper end chamfered sleeve 901, an aluminum end chamfered sleeve 902, and a guide cone surface 903. The outer surface of the copper connecting pipe 1 is provided with the copper end chamfered sleeve 901, the outer surface of the aluminum connecting pipe 2 is fitted with the aluminum end chamfered sleeve 902, and the copper-aluminum transition joint 4 is provided with the guide cone surface 903. A mounting bracket 10 is provided on the end side of the aluminum connecting pipe 2, and the mounting bracket 10 has a bracket threaded hole 1001. A flange 11 is provided at the end of the copper end corrugated pipe protective sleeve 702. The flange 11 has flange bolt holes 1101.

[0025] Working principle of copper-aluminum connecting pipes for megawatt units: Copper connecting pipe 1 and aluminum connecting pipe 2 achieve reliable connection of dissimilar metals through internal copper-aluminum transition joint 4. The copper-aluminum transition joint 4 utilizes a metallurgical or mechanical composite structure to reduce the contact resistance of the copper-aluminum interface, avoid electrochemical corrosion caused by potential difference, and ensure stable transmission of large currents in megawatt units. The connecting pipe holes 3 inside copper connecting pipe 1 and aluminum connecting pipe 2 provide a channel for current transmission, meeting the high current carrying capacity requirements of megawatt-level units.

[0026] The insulating component 5 achieves electrical isolation between the copper connecting pipe 1, the aluminum connecting pipe 2 and external equipment through the cooperation of the insulating sleeve 501 and the insulating end cap 502: the insulating sleeve 501 wraps around the main body of the connecting pipe, blocking the lateral leakage path; the insulating end cap 502 seals the end of the insulating sleeve 501, while the copper connecting pipe 1 passes through the through hole of the insulating end cap 502, leaving only the conductive end connected to the external conductor, to avoid electric shock to personnel or short circuit of equipment.

[0027] The sealing assembly 6 achieves sealing and anti-loosening of the connection parts through the synergistic effect of the anti-loosening gasket 601, the copper end sealing ring 602, and the aluminum end sealing ring 603: the anti-loosening gasket 601 increases the friction of the connection surface to prevent the copper connecting pipe 1 and the aluminum connecting pipe 2 from loosening due to unit vibration; the copper end sealing ring 602 and the aluminum end sealing ring 603 respectively fit the ends of the copper and aluminum connecting pipes, fill the connection gap, block the entry of moisture, dust and other impurities, and avoid internal corrosion or increased contact resistance.

[0028] The protective component 7 provides physical protection for the surface of the connecting pipe through the aluminum end corrugated pipe protective sleeve 701 and the copper end corrugated pipe protective sleeve 702: the corrugated pipe structure can deform synchronously with the thermal expansion and contraction of the connecting pipe, avoiding external impacts such as collisions during unit operation and maintenance that could damage the surface of the connecting pipe; at the same time, it isolates external moisture and oil stains, delays the oxidation and corrosion of the copper-aluminum connecting pipe, and extends its service life.

[0029] The thermal expansion compensation mechanism 8 inside the copper-aluminum transition joint 4 alleviates the internal stress caused by the difference in thermal expansion coefficients of copper and aluminum through the copper-aluminum thermal expansion compensation cavity 801 and the reserved groove 802. When the unit generates heat during operation, the expansion amounts of the copper connecting pipe 1 and the aluminum connecting pipe 2 are different. The reserved groove 802 provides deformation space inside the transition joint, while the copper-aluminum thermal expansion compensation cavity 801 absorbs the internal stress through the elastic deformation of its own structure, thus preventing the transition joint from cracking or loosening.

[0030] The guide assembly component 9 simplifies the installation process and ensures assembly accuracy through the copper end chamfered sleeve 901, the aluminum end chamfered sleeve 902, and the guide cone surface 903: the copper end chamfered sleeve 901 and the aluminum end chamfered sleeve 902 respectively guide the copper and aluminum connecting pipes to be inserted into the external equipment interface; the guide cone surface 903 in the copper-aluminum transition joint 4 assists in the precise docking of the copper and aluminum connecting pipes with the transition joint, avoiding poor contact caused by misalignment during assembly.

[0031] Mounting bracket 10 fixes aluminum connecting pipe 2 to the preset position of the unit through bracket threaded hole 1001, ensuring that the connecting pipe remains stable during unit operation; flange 11 at the end of copper end corrugated pipe protective sleeve 702 is connected to external equipment flange through flange bolt hole 1101, further improving the mechanical strength and stability of the connection and adapting to the vibration conditions of megawatt unit.

[0032] Through multi-dimensional collaboration including conductive connections, insulation protection, sealing and anti-loosening, thermal compensation, and guided assembly, the components ensure safe, stable, and long-term current transmission in the copper-aluminum connecting pipes of megawatt units under conditions of high current carrying capacity, strong vibration, and many impurities.

[0033] Working process of copper-aluminum connecting pipes for megawatt units: The guide assembly component 9 is used to assist in the docking of copper and aluminum connecting pipes with copper-aluminum transition joints 4: the copper end chamfered sleeve 901 is put into the outer surface of copper connecting pipe 1, and the aluminum end chamfered sleeve 902 is put into the outer surface of aluminum connecting pipe 2; guided by the guide cone surface 903 inside the copper-aluminum transition joint 4, the copper connecting pipe 1 and aluminum connecting pipe 2 are accurately inserted into both ends of the transition joint to complete the conductive connection of dissimilar metals, and the internal connecting pipe hole 3 forms a complete current channel.

[0034] The insulating sleeve 501 is wrapped around the copper and aluminum connecting pipe body, and the insulating end cap 502 is installed at the end of the insulating sleeve 501, so that the copper connecting pipe 1 passes through the through hole of the insulating end cap 502 to achieve electrical isolation. Anti-loosening gaskets 601 are installed at the connection points of copper connecting pipe 1 and aluminum connecting pipe 2. Then, copper end sealing rings 602 and aluminum end sealing rings 603 are embedded at the ends of copper connecting pipe 1 and aluminum connecting pipe 2, respectively, to complete the sealing and anti-loosening pretreatment.

[0035] The aluminum end corrugated pipe protective sleeve 701 is fitted onto the surface of the aluminum connecting pipe 2, and the copper end corrugated pipe protective sleeve 702 is fitted onto the outer surface of the copper connecting pipe 1. The connecting pipe is fixed to the preset position of the megawatt unit through the bracket threaded hole 1001 of the bracket 10 at the end of the aluminum connecting pipe 2; the flange 11 at the end of the copper end corrugated pipe protective sleeve 702 is used to fasten the connection with the flange of the external equipment through the flange bolt hole 1101 to complete the overall assembly.

[0036] When the megawatt unit is running, the current is transmitted through the path from copper connecting pipe 1 to copper-aluminum transition joint 4 to aluminum connecting pipe 2. The internal connecting pipe hole 3 ensures a large current carrying capacity. The copper-aluminum transition joint 4 alleviates the problem of copper-aluminum potential difference and contact resistance, avoids electrochemical corrosion, and maintains stable current transmission.

[0037] The heat generated by the unit operation causes the copper connecting pipe 1 and the aluminum connecting pipe 2 to expand differently due to the difference in their coefficients of thermal expansion. At this time, the thermal expansion compensation mechanism 8 in the copper-aluminum transition joint 4 is activated: the reserved groove 802 provides deformation space for the copper-aluminum thermal expansion compensation cavity 801. The cavity absorbs the internal stress of thermal expansion through elastic deformation to prevent the transition joint from cracking or loosening.

[0038] Insulation component 5 continuously blocks the leakage path, avoiding the risk of electrical short circuit or electric shock; The sealing assembly 6 resists unit vibration through the anti-loosening gasket 601, and the copper end sealing ring 602 and the aluminum end sealing ring 603 maintain the connection gap seal to prevent impurities from entering. The corrugated sleeve of the protective component 7 deforms synchronously with the thermal expansion and contraction of the connecting pipe, isolating it from external impacts and corrosive media, and protecting the surface of the connecting pipe.

[0039] Regularly inspect whether the corrugated pipe protective sleeve of the protective component 7 is damaged and whether the insulation component 5 has cracks; check whether the connecting pipe is loose by checking the fixing status of the flange 11 and the mounting bracket 10. If the anti-loosening gasket 601 of the sealing component 6 is found to be ineffective or the copper end sealing ring 602 and the aluminum end sealing ring 603 are found to be aged, the flange 11 and the mounting bracket 10 can be removed and the corresponding sealing components replaced; if the insulating sleeve 501 is damaged, the insulating component 5 can be replaced directly to ensure long-term operational reliability.

[0040] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the utility model, are covered within the scope of the claims of the present utility model.

Claims

1. A copper-aluminum connecting pipe for a megawatt generator unit, comprising a copper connecting pipe (1) and an aluminum connecting pipe (2), characterized in that, The copper connecting pipe (1) and the aluminum connecting pipe (2) are provided with connecting pipe holes (3), a copper-aluminum transition joint (4) is provided between the copper connecting pipe (1) and the aluminum connecting pipe (2), an insulating component (5) is provided at the ends of the copper connecting pipe (1) and the aluminum connecting pipe (2), a sealing component (6) and a protective component (7) are provided on the copper connecting pipe (1) and the aluminum connecting pipe (2), and a thermal expansion compensation mechanism (8) is provided inside the copper-aluminum transition joint (4).

2. The copper-aluminum connecting pipe for a megawatt generator unit according to claim 1, characterized in that, The insulating component (5) includes an insulating sleeve (501) and an insulating end cap (502). The insulating sleeve (501) is provided with an insulating end cap (502) at its end, and the copper connecting pipe (1) passes through the through hole of the insulating end cap (502).

3. The copper-aluminum connecting pipe for a megawatt generator unit according to claim 2, characterized in that, The sealing assembly (6) includes an anti-loosening gasket (601), a copper end sealing ring (602), and an aluminum end sealing ring (603). The copper connecting pipe (1) and the aluminum connecting pipe (2) are both provided with anti-loosening gaskets (601). The end of the copper connecting pipe (1) is provided with a copper end sealing ring (602), and the end of the aluminum connecting pipe (2) is provided with an aluminum end sealing ring (603).

4. The copper-aluminum connecting pipe for a megawatt unit according to claim 3, characterized in that, The protective component (7) includes an aluminum end corrugated pipe protective sleeve (701) and a copper end corrugated pipe protective sleeve (702). The aluminum end corrugated pipe protective sleeve (701) is provided on the surface of the aluminum connecting pipe (2), and the copper end corrugated pipe protective sleeve (702) is provided on the outer surface of the copper connecting pipe (1).

5. The copper-aluminum connecting pipe for a megawatt generator unit according to claim 4, characterized in that, The thermal expansion compensation mechanism (8) includes a copper-aluminum thermal expansion compensation cavity (801) and a reserved groove (802), wherein the reserved groove (802) is provided inside the copper-aluminum thermal expansion compensation cavity (801).

6. The copper-aluminum connecting pipe for a megawatt generator unit according to claim 5, characterized in that, The copper connecting pipe (1) and the aluminum connecting pipe (2) are provided with guide assembly components (9), which include a copper end chamfer sleeve (901), an aluminum end chamfer sleeve (902), and a guide cone surface (903).

7. A copper-aluminum connecting pipe for a megawatt generator unit according to claim 6, characterized in that, The outer surface of the copper connecting pipe (1) is provided with a copper end chamfer sleeve (901), the outer surface of the aluminum connecting pipe (2) is provided with an aluminum end chamfer sleeve (902), and the copper-aluminum transition joint (4) is provided with a guide cone surface (903).

8. A copper-aluminum connecting pipe for a megawatt generator unit according to claim 7, characterized in that, The aluminum connecting pipe (2) is provided with a mounting bracket (10) on its end side, and the mounting bracket (10) is provided with a bracket thread hole (1001).

9. A copper-aluminum connecting pipe for a megawatt generator unit according to claim 8, characterized in that, The end of the copper-end corrugated pipe protective sleeve (702) is provided with a flange (11).

10. A copper-aluminum connecting pipe for a megawatt generator unit according to claim 9, characterized in that, The flange (11) is provided with flange bolt holes (1101).

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