Vacuum arc-extinguishing chamber copper-clad steel composite conducting rod and method and vacuum arc-extinguishing chamber

Abstract

The invention discloses a vacuum arc-extinguishing chamber copper-clad steel composite conducting rod, a method and a vacuum arc-extinguishing chamber. The composite conducting rod comprises a supporting rod and a conducting layer. The conductive layer wraps the outer surface of the supporting rod, and the supporting rod and the conductive layer are of an integrated structure to form a composite conductive rod; the conductive layer is made of an oxygen-free copper material; the supporting rod is used for enhancing the overall mechanical performance of the conducting rod. One end of the composite conducting rod is fixedly connected with the static end electrode or the moving end electrode; and the other end of the composite conducting rod is fixedly connected with an insulating pull rod or a circuit breaker. The integral conducting rod is formed by compounding high-strength metal materials such as oxygen-free copper and stainless steel, the mechanical strength of the inner material and the outer material is enhanced, the requirements for high conductivity and high mechanical strength are met, the conducting rod is machined at a time, acid pickling is conducted, assembling is simple in production, welding reliability is high, and cost is low. And the problem that the stainless steel core is desoldered or fractured when the existing structure is used can be effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum interrupter chambers, and in particular relates to a vacuum interrupter chamber copper-clad steel composite conductive rod and method, and a vacuum interrupter chamber. Background Art

[0002] As the core component of vacuum switches, vacuum interrupters are widely used in the power industry due to their advantages of strong breaking, long life, maintenance-free and environmentally friendly. Vacuum switches with voltage levels of 40.5kV and below have almost covered the entire power distribution field. In the context of international restrictions and prohibitions on the use of SF6 gas, vacuum switches with voltage levels of 72.5kV and above have become an effective alternative to SF6 gas switches.

[0003] With the continuous development of vacuum breaking technology, the design and manufacturing level of vacuum switches has been improved day by day. In recent years, the market demand for 72.5kV and 126kV vacuum switches has increased dramatically, and 252kV vacuum switches have also entered an intense research and development stage. 126kV and 252kV single-break vacuum interrupters have the characteristics of large rated current and fast opening and closing speed, requiring their conductive rods to meet the requirements of high conductivity and high mechanical strength.

[0004] Conventional conductive rods use a single oxygen-free copper material, such as the invention patent with publication number CN109036949A, entitled "A Conductive Rod for Vacuum Interrupter and Its Processing Method", which is a tungsten copper contact and an oxygen-free copper guide rod that are integrated by plasma or friction welding. However, this single material structure has defects such as severe roughening and severe indentation, and the mechanical strength is far from meeting the requirements. Due to the existence of the skin effect, when there is alternating current or alternating electromagnetic field, the current is concentrated on the "skin" part of the conductive rod, that is, the thin layer on the surface of the conductor, and the closer to the conductor surface, the greater the current density. Therefore, the prior art provides a conductive rod structure for vacuum interrupter, vacuum interrupter and pole with publication number CN213988724U, which enhances the magnetic field of the dynamic conductive rod or the static conductive rod by a magnetic reinforcement component. However, because it adopts a split structure, it needs to be processed separately during the production process, degreasing and pickling are carried out according to the process of parts of different materials, and the later assembly is complicated and the welding quality is unstable. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a vacuum interrupter copper-clad steel composite conductive rod and method and a vacuum interrupter, wherein an integral conductive rod is formed by compounding high-strength metal materials such as oxygen-free copper and stainless steel, and the mechanical strengths of the two materials inside and outside are mutually reinforced to meet the requirements of high conductivity and high mechanical strength. The conductive rod is processed and pickled at one time, and the assembly is simple during production, and the welding reliability is high, which can effectively solve the problem of desoldering or breakage of the stainless steel core in the current structure during use.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A vacuum interrupter copper-clad steel composite conductive rod, comprising a support rod and a conductive layer;

[0008] The conductive layer is coated on the outer surface of the support rod, and the support rod and the conductive layer are an integrated structure to form a composite conductive rod; the conductive layer is made of oxygen-free copper material; the support rod is used to enhance the overall mechanical properties of the conductive rod;

[0009] One end of the composite conductive rod is used for fixedly connecting the static end electrode or the dynamic end electrode; the other end of the composite conductive rod is used for fixedly connecting the insulating pull rod or the circuit breaker.

[0010] Preferably, the support rod is made of stainless steel or high-strength steel.

[0011] Preferably, the conductivity of the conductive layer is ≥55MS / m.

[0012] Preferably, the strength of the bonding layer between the support rod and the conductive layer is ≥80 MPa, and the thickness of the bonding layer is in the range of 10 to 100 μm.

[0013] Preferably, the outer surface of the composite conductive rod is provided with a step surface for brazing and positioning with the bellows fixing ring.

[0014] Preferably, the support rod and the conductive layer are tightly combined by powder metallurgy to form an integrated structure.

[0015] Preferably, a keyway is axially arranged on the support rod, and the depth and width of the keyway are greater than 2 mm.

[0016] Preferably, a plurality of annular grooves are provided on the support rod along the axial direction, and the depth of the annular grooves is greater than 2 mm.

[0017] A vacuum interrupter, characterized in that it comprises a vacuum interrupter copper-clad steel composite conductive rod as described in any one of the above; the composite conductive rods are used as static conductive rods and dynamic conductive rods respectively;

[0018] The static conductive rod and the dynamic conductive rod are installed inside the metallized porcelain shell of the vacuum interrupter, and the static cover plate and the dynamic cover plate are fixed at both ends of the metallized porcelain shell of the vacuum interrupter respectively;

[0019] The static cover plate is provided with a through hole for the static conductive rod to extend into the metallized porcelain shell of the vacuum arc extinguishing chamber, and the end of the static conductive rod is provided with a static end electrode;

[0020] The movable cover plate is provided with a through hole for the movable conductive rod to extend into the metallized porcelain shell of the vacuum arc extinguishing chamber, and a movable end electrode is arranged at the end of the movable conductive rod; a bellows assembly is sleeved on the movable conductive rod, one end of the bellows assembly is welded to the movable cover plate, and the other end is fixed to the movable conductive rod by a bellows fixing ring, and when the movable conductive rod drives the movable end electrode to move, the bellows assembly can expand and contract with the movable conductive rod.

[0021] A method for manufacturing a copper-clad steel composite conductive rod for a vacuum interrupter comprises the following steps:

[0022] Place the support rod vertically at the center of the inner core positioning mold, and then place the outer circle size mold on the outside of the support rod. The top of the inner core positioning mold is provided with a central groove for connecting the support rod and an annular groove for connecting the outer circle size mold;

[0023] The electrolytic copper is melted by heating to not less than 1100°C under a protective atmosphere, and then the molten electrolytic copper liquid is poured into a mold with a support rod placed in the middle; after complete cooling, the composite rod is taken out of the mold, the copper-clad steel composite rod is cut, and the outer circle is polished, and then processed into the required vacuum arc chamber copper-clad steel composite conductive rod.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects:

[0025] The present invention provides a copper-clad steel composite conductive rod for a vacuum arc extinguishing chamber, wherein an outer layer of oxygen-free copper material is used for conducting electricity, and an inner core of stainless steel or high-strength steel is used to enhance the mechanical properties of the overall conductive rod. The outer surface of the oxygen-free copper can be processed with the required brazing structure, which is convenient for brazing with other parts; the inner steel core can be processed with connecting structures such as internal threads and external threads, which are used for reliable connection with circuit breakers and the like. The outer layer of oxygen-free copper and the inner steel core are composited by powder metallurgy, so that the oxygen-free copper and the inner steel core are tightly combined without gaps, so as to avoid acid storage during the later pickling process, and the oxygen-free copper and the inner steel core form a transition zone at the joint surface, thereby enhancing the bonding strength between the inner steel core and the oxygen-free copper.

[0026] The present invention forms an integral conductive rod by compounding high-strength metal materials such as oxygen-free copper and stainless steel. The mechanical strengths of the two materials inside and outside are mutually reinforced to meet the requirements of high conductivity and high mechanical strength. The conductive rod is processed and pickled at one time. The assembly is simple during production and the welding reliability is high. The problem of desoldering or breakage of the conductive rod in the current structure during use can be effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A cross-sectional view of a copper-clad steel composite conductive rod of a vacuum interrupter in the present invention;

[0028] Figure 2 It is a schematic diagram of the vacuum interrupter chamber in the present invention;

[0029] Figure 3 is a cross-sectional view of a composite conductive rod in Example 1 of the present invention;

[0030] Figure 4 It is a schematic diagram of a moving tube core assembled with a composite conductive rod in Example 1 of the present invention;

[0031] Figure 5 It is a schematic diagram of a static tube core assembled with a composite conductive rod in Example 1 of the present invention;

[0032] Figure 6 The surface of the composite conductive inner core structure is a keyway structure diagram;

[0033] Figure 7 The surface of the composite conductive inner core structure is a ring groove structure diagram;

[0034] Figure 8 It is the composite conductive rod inner core positioning mold of embodiment 2 of the present invention;

[0035] Fig. 9 It is the copper outer circle size mold of the composite conductive rod of Example 2 of the present invention;

[0036] Fig.10 This is a schematic diagram of mold installation during the casting process of the composite conductive rod in Example 2 of the present invention;

[0037] Fig.11 This is an electron microscope image of the bonding surface of the composite conductive rod of Example 3 of the present invention;

[0038] Fig.12 This is a metallographic image of the bonding surface of the composite conductive rod of Example 3 of the present invention at 50 μm;

[0039] Fig.13 This is a metallographic image of the bonding surface of the composite conductive rod of Example 3 of the present invention at 100 μm;

[0040] Fig.14 This is a metallographic image of the 20 μm bonding surface of the composite conductive rod in Example 3 of the present invention.

[0041] In the attached drawings: metallized porcelain shell 1 of vacuum arc extinguishing chamber; static cover plate 2; static end sealing ring 3; static conductive rod steel core 4; static conductive rod outer layer oxygen-free copper 5; static end electrode 6; dynamic end electrode 7; dynamic conductive rod steel core 8; dynamic conductive rod outer layer oxygen-free copper 9, bellows fixing ring 10; bellows assembly 11; dynamic end sealing ring 12; dynamic cover plate 13; support rod 14; conductive layer 15; keyway 16; annular groove 17; inner core positioning mold 18; outer circle size mold 19. DETAILED DESCRIPTION

[0042] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0048] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0049] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0050] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0051] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0052] Example 1

[0053] like Figure 1 As shown, an embodiment of the present invention provides a vacuum arc chamber copper-clad steel composite conductive rod, including a support rod 14 and a conductive layer 15.

[0054] The conductive layer 15 is coated on the outer surface of the support rod 14. The support rod 14 and the conductive layer 15 are an integrated structure to form a composite conductive rod. The conductive layer 15 is made of oxygen-free copper material. The support rod 14 is used to enhance the overall mechanical properties of the conductive rod.

[0055] In the embodiment of the present invention, the outer layer of oxygen-free copper material of the conductive layer 15 is used for conducting electricity, and the support rod 14 uses stainless steel or high-strength steel as the inner core to enhance the mechanical properties of the overall conductive rod. The outer surface of oxygen-free copper can be processed into the required brazing structure, which is convenient for brazing with other parts; the inner steel core can be processed into connection structures such as internal threads and external threads for reliable connection with circuit breakers, etc.

[0056] In the embodiment of the present invention, the outer layer of oxygen-free copper and the inner steel core are compounded by powder metallurgy, so that the oxygen-free copper and the inner steel core are tightly combined without gaps to avoid acid storage during the later pickling process, and the oxygen-free copper and the inner steel core form a transition zone on the bonding surface to strengthen the bonding strength between the inner steel core and the oxygen-free copper. After compounding, the conductivity of the outer layer of oxygen-free copper material is ≥55MS / m, and the bonding layer strength is ≥80Mpa

[0057] Example 2

[0058] like Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a vacuum arc extinguishing chamber, including a vacuum arc extinguishing chamber metallized porcelain shell 1, a static cover plate 2, a static end sealing ring 3, a static end electrode 6, a static conductive rod, a dynamic end electrode 7, a dynamic conductive rod, a bellows fixing ring 10, a bellows assembly 11, a dynamic end sealing ring 12, and a dynamic cover plate 13.

[0059] The two ends of the vacuum interrupter metallized porcelain shell 1 are respectively fixed with a static cover plate 2 and a dynamic cover plate 13; the connection between the static cover plate 2 and the vacuum interrupter metallized porcelain shell 1 is provided with a static end sealing ring 3. The connection between the dynamic cover plate 13 and the vacuum interrupter metallized porcelain shell 1 is provided with a dynamic end sealing ring 12.

[0060] The static cover plate 2 is provided with a perforation for the static conductive rod to extend into the metallized porcelain shell 1 of the vacuum interrupter, and the static end electrode 6 is arranged at the end of the static conductive rod. The static conductive rod comprises a static conductive rod steel core 4 and an outer layer of oxygen-free copper 5 of the static conductive rod; the static conductive rod steel core 4 and the outer layer of oxygen-free copper 5 of the static conductive rod are an integrated structure. The static conductive rod steel core 4 is used to enhance the overall mechanical properties of the conductive rod; the outer layer of oxygen-free copper 5 of the static conductive rod is used for conduction.

[0061] The movable cover plate 13 is provided with a through hole for the movable conductive rod to extend into the metallized porcelain shell 1 of the vacuum interrupter, and the movable end electrode 7 is arranged at the end of the movable conductive rod. A bellows assembly 11 is sleeved on the movable conductive rod, one end of the bellows assembly 11 is welded to the movable cover plate 13, and the other end is fixed to the movable conductive rod through a bellows fixing ring 10. When the movable conductive rod drives the movable end electrode 7 to move, the bellows assembly 11 can be extended and deformed with the movable conductive rod.

[0062] The dynamic conductive rod comprises a dynamic conductive rod steel core 8 and a dynamic conductive rod outer layer oxygen-free copper 9, which are an integrated structure. The dynamic conductive rod steel core 8 is used to enhance the overall mechanical properties of the conductive rod; the dynamic conductive rod outer layer oxygen-free copper 9 is used for conducting electricity.

[0063] like Figure 4As shown, the moving tube core assembled with the composite conductive rod is processed with internal or external threads at one end of the composite conductive rod for reliable connection with the insulating pull rod, circuit breaker, etc. A step is machined at a specific position of the composite conductive rod for brazing positioning with the bellows fixing ring 10. A flat surface is processed at the other end of the composite conductive rod for brazing with the moving end electrode 7.

[0064] like Figure 5 As shown, the static tube core assembled with the composite conductive rod is processed with internal or external threads at one end of the composite conductive rod for reliable connection with the insulating pull rod, circuit breaker, etc. A step is machined at a specific position of the composite conductive rod for brazing positioning with the static end cover plate 2. A flat surface is machined at the other end of the composite conductive rod for brazing with the static end electrode 6.

[0065] In the embodiment of the present invention, except for the static conductive rod steel core 4, the static conductive rod outer layer oxygen-free copper 5, the dynamic conductive rod steel core 8 and the dynamic conductive rod outer layer oxygen-free copper, the remaining parts are welded by brazing.

[0066] Example 3

[0067] like Figure 6 As shown, a copper-clad steel composite conductive rod of a vacuum interrupter of the present invention is suitable for a composite conductive rod structure for a high voltage, high current, and fast disconnection vacuum interrupter. The outer side of the composite conductive rod is made of oxygen-free copper material, and the inner core of the composite conductive rod is made of high-strength steel such as stainless steel. When powder metallurgy is performed, the oxygen-free copper material of the outer layer of the composite conductive rod is formed by melting electrolytic copper under a protective atmosphere. The inner core of the composite conductive rod is made of high-strength steel such as stainless steel, and a partial thread or annular groove 17 is machined on the surface of the inner core, and a key groove 16 is milled in the axial direction, wherein the thread specification corresponds to the outer diameter specification of the inner core, the depth of the annular groove 17 can be greater than 2 mm, the depth and width of the key groove 16 can be greater than 2 mm, and the number of key grooves 16 is not less than 1.

[0068] like Figure 7 As shown, to ensure that the inner core has sufficient strength, the depth of the annular groove 17 and the keyway 16 is less than 1 / 8 of the outer diameter of the inner core. The inner diameter of the mold used in the composite conductive rod processing is at least 4mm larger than the outer diameter of the conductive rod, which is used for later polishing of the rod surface. The length of the mold used in the composite conductive rod processing is not less than 20mm longer than the length of the conductive rod, which is used for later cutting of the pouring and riser.

[0069] The arc extinguishing chamber of the present invention meets the requirements of high voltage, high current and fast switching. The arc extinguishing chamber uses steel and oxygen-free copper rods as a composite conductive rod rod. The conductive rod has both high conductivity and high mechanical strength. The external oxygen-free copper is mainly used for conduction, and the internal rod core is mainly used to withstand mechanical impact. The conductive rod is formed in one step in the later stage, which improves the processing efficiency of the conductive rod. The conductive rod is suitable for vacuum arc extinguishing chambers with high voltage, high current and fast switching.

[0070] Example 3

[0071] like Figures 8 to 10 As shown, an embodiment of the present invention provides a method for manufacturing a copper-clad steel composite conductive rod of a vacuum interrupter, comprising the following processes:

[0072] First, the support rod 14 is vertically placed at the center of the inner core positioning mold 18, and then the outer circle size mold 19 is placed on the outside of the support rod 14. The top of the inner core positioning mold 18 is provided with a central groove for connecting the support rod 14 and an annular groove for connecting the outer circle size mold 19.

[0073] The electrolytic copper is melted by heating to not less than 1100°C in a protective atmosphere, and then the molten electrolytic copper liquid is poured into a mold with a support rod 14 placed in the middle. After cooling completely, the composite rod is taken out of the mold, the copper-clad steel composite rod is cut, and the outer circle is polished, and then processed into the required vacuum interrupter copper-clad steel composite conductive rod.

[0074] The present invention provides an integral conductive rod material that is a composite of steel and oxygen-free copper rods for high voltage, high current and fast switching vacuum interrupters. The conductive rod has both high conductivity and high mechanical strength. The external oxygen-free copper is mainly used for conduction, and the internal rod core is mainly used to withstand mechanical impact. The conductive rod is formed in one step in the later stage, which improves the processing efficiency of the conductive rod. The conductive rod is suitable for vacuum interrupters for high voltage, high current and fast switching.

[0075] like Figures 11 to 14 As shown, the outer oxygen-free copper and the inner steel core are compounded by powder metallurgy, so that the oxygen-free copper and the inner steel core are closely combined without gaps to avoid acid storage during the later pickling process, and the oxygen-free copper and the inner steel core form a transition zone on the bonding surface to strengthen the bonding strength between the inner steel core and the oxygen-free copper. The thickness of the transition zone ranges from 10 to 100μm.

[0076] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0077] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A vacuum interrupter copper-clad steel composite conductive rod, characterized in that: It comprises a support rod (14) and a conductive layer (15); The conductive layer (15) is coated on the outer surface of the support rod (14); the support rod (14) and the conductive layer (15) are an integrated structure to form a composite conductive rod; the conductive layer (15) is made of oxygen-free copper material; the support rod (14) is used to enhance the overall mechanical properties of the conductive rod; One end of the composite conductive rod is used for fixedly connecting to a static end electrode (6) or a dynamic end electrode (7); the other end of the composite conductive rod is used for fixedly connecting to an insulating pull rod or a circuit breaker.

2. The copper-clad steel composite conductive rod for vacuum interrupter according to claim 1, characterized in that: The support rod (14) is made of stainless steel or high-strength steel.

3. The copper-clad steel composite conductive rod for vacuum interrupter according to claim 1, characterized in that: The conductivity of the conductive layer (15) is ≥55MS / m.

4. The copper-clad steel composite conductive rod for vacuum interrupter according to claim 1, characterized in that: The strength of the bonding layer between the support rod (14) and the conductive layer (15) is ≥80Mpa, and the thickness of the bonding layer is in the range of 10 to 100 μm.

5. The copper-clad steel composite conductive rod for vacuum interrupter according to claim 1, characterized in that: The outer surface of the composite conductive rod is provided with a step surface for brazing and positioning with a bellows fixing ring (10).

6. The copper-clad steel composite conductive rod for vacuum interrupter according to claim 1, characterized in that: The support rod (14) and the conductive layer (15) are tightly combined by powder metallurgy to form an integrated structure.

7. The copper-clad steel composite conductive rod for vacuum interrupter according to claim 1, characterized in that: The support rod (14) is axially provided with a keyway (16), and the depth and width of the keyway (16) are greater than 2 mm.

8. The copper-clad steel composite conductive rod for vacuum interrupter according to claim 1, characterized in that: The support rod (14) is provided with a plurality of annular grooves (17) along the axial direction, and the depth of the annular grooves (17) is greater than 2 mm.

9. A vacuum interrupter, characterized in that: It comprises a vacuum interrupter copper-clad steel composite conductive rod as claimed in any one of claims 1 to 8; the composite conductive rod is used as a static conductive rod and a dynamic conductive rod respectively; The static conductive rod and the dynamic conductive rod are installed inside the metallized ceramic shell (1) of the vacuum interrupter, and the two ends of the metallized ceramic shell (1) of the vacuum interrupter are respectively fixed with a static cover plate (2) and a dynamic cover plate (13); The static cover plate (2) is provided with a through hole for the static conductive rod to extend into the metallized porcelain shell (1) of the vacuum arc extinguishing chamber, and the end of the static conductive rod is provided with a static end electrode (6); The movable cover plate (13) is provided with a through hole for the movable conductive rod to extend into the metallized ceramic shell (1) of the vacuum arc extinguishing chamber, and a movable end electrode (7) is arranged at the end of the movable conductive rod; a bellows assembly (11) is sleeved on the movable conductive rod, one end of the bellows assembly (11) is welded to the movable cover plate (13), and the other end is fixed to the movable conductive rod via a bellows fixing ring (10); when the movable conductive rod drives the movable end electrode (7) to move, the bellows assembly (11) can expand and contract with the movable conductive rod.

10. A method for manufacturing a copper-clad steel composite conductive rod for a vacuum interrupter, characterized in that: Including the following process, The support rod (14) is vertically placed at the center of the inner core positioning mold (18), and then the outer circle size mold (19) is placed outside the support rod (14). The top of the inner core positioning mold (18) is provided with a central groove for connecting the support rod (14) and an annular groove for connecting the outer circle size mold (19); The electrolytic copper is melted by heating to not less than 1100° C. in a protective atmosphere, and then the molten electrolytic copper liquid is poured into a mold with a support rod (14) placed in the middle; after complete cooling, the composite rod is taken out of the mold, the copper-clad steel composite rod is cut, and the outer circle is polished, and then processed into the required vacuum arc chamber copper-clad steel composite conductive rod.

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