High-strength conducting rod for vacuum arc-extinguishing chamber

Abstract

The utility model relates to the technical field of vacuum arc-extinguishing chambers, in particular to a high-strength conducting rod for a vacuum arc-extinguishing chamber. The high-strength conducting rod for the vacuum arc-extinguishing chamber comprises a rod main body, the rod main body is provided with an axial through hole to form a hollow structure, a rod core is arranged in the axial through hole, the rod main body comprises at least two sections of conducting rod bodies, the conducting rod bodies are arranged in the axial direction of the rod main body, and any two adjacent sections of conducting rod bodies are welded and fixed. The rod core axially penetrates through the rod body along the axial through hole, welding areas are formed between the rod core and the inner circumferential side faces of the two ends of the rod body, and special-shaped grooves for containing welding flux are formed in the outer circumferential side faces, corresponding to the welding areas, of the rod core. The welding flux can flow to the welding area between the rod core and the rod main body after being melted in the special-shaped groove, so that the rod core and the rod main body are completely welded, the mechanical strength of the conducting rod is effectively improved, and the requirement for the mechanical service life of a vacuum arc-extinguishing chamber is met.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum interrupter chambers, in particular to a high-strength conductive rod for vacuum interrupter chambers. Background Art

[0002] Vacuum interrupters are core components of medium- and high-voltage power switches. Their primary function is to rapidly extinguish arcs and suppress current flow after power is disconnected, using the excellent insulation properties of the vacuum within the tube to prevent accidents and incidents. They are primarily used in power transmission and distribution control systems. Their conductive rods must not only exhibit excellent electrical conductivity but also possess a certain degree of mechanical strength to ensure the mechanical life of the switch.

[0003] The current existing structure places a stainless steel core 2 in the middle of a copper conductive rod, relying on the stainless steel core 2 to improve the mechanical strength of the conductive rod. A Chinese invention patent with publication number CN 115483062 A and publication date December 16, 2022, discloses a vacuum interrupter and a conductive rod for the vacuum interrupter, comprising a rod body; the rod body is provided with an axial through-hole, forming a hollow structure; a rod core is provided within the axial through-hole; the rod core is welded to the rod body, and the rod core is made of steel and is welded to the rod body via an annular weld on the end face, thereby enhancing the overall strength of the conductive rod; the inner end of the axial through-hole on the rod body is provided with a countersunk hole, and the inner end of the rod core is provided with a large-diameter section, which cooperates with the bottom wall of the countersunk hole to stop the rod core axially along the conductive rod, preventing it from moving toward the outer end of the conductive rod. However, because the rod core and rod body in the aforementioned invention are not completely welded together, the outer portion of the rod, where the weld is not present, can still become thicker and shorter during the switch opening and closing operations. This phenomenon is particularly severe in high-voltage vacuum interrupters due to the long length of the rods. Deformation of the conductive rod directly affects the mechanical life of the switch and, in severe cases, can even lead to vacuum failure. Summary of the Invention

[0004] The purpose of the utility model is to provide a high-strength conductive rod for a vacuum interrupter, so as to solve the problem in the prior art that the conductive rod for the vacuum interrupter is easily deformed during the opening and closing operations of the switch.

[0005] In order to solve the above problems, the technical solution of a high-strength conductive rod for a vacuum interrupter in the present invention is:

[0006] A high-strength conductive rod for a vacuum interrupter comprises a rod body, the rod body being provided with an axial through-hole to form a hollow structure, a rod core being provided in the axial through-hole, the rod body comprising at least two sections of conductive rod bodies, the conductive rod bodies being arranged axially along the rod body and any two adjacent sections of the conductive rod bodies being welded and fixed together, the rod core axially penetrating the rod body along the axial through-hole and forming a welding area between the inner circumferential side surfaces at both ends of the rod body, a special-shaped groove for accommodating solder being provided on the outer circumferential side surface corresponding to the welding area on the rod core, the solder being melted in the special-shaped groove and being able to flow to the welding area between the rod core and the rod body so that the rod core and the rod body are completely welded.

[0007] Furthermore, one end of the rod core is provided with a first large diameter section that cooperates with the first conductive rod body at one end of the rod body, and a second large diameter section that cooperates with the second conductive rod body at the other end of the rod body is provided at a position on the rod core away from the first large diameter section, and the special-shaped grooves are provided on the first large diameter section and the second large diameter section so that the outer peripheral side surfaces of the first large diameter section and the second large diameter section are welding areas.

[0008] Furthermore, a countersink is provided at one end of the first conductive rod body, and the first large diameter section is positioned in the countersink along the radial direction of the first conductive rod body, so that the first large diameter section and the countersink are matched along the axial direction of the rod body.

[0009] Furthermore, the second conductive rod body is matched with the adjacent conductive rod body in an axial blocking manner along the rod body, and is matched with the second large diameter section in a radial positioning manner along the rod body.

[0010] Furthermore, the axial dimension of the first large diameter section is equal to the axial dimension of the counterbore, and the axial dimension of the second large diameter section is smaller than the axial dimension of the second conductive rod body.

[0011] Furthermore, the axial dimension of the first large diameter section is the same as the axial dimension of the second large diameter section.

[0012] Furthermore, a first step is provided between the inner end surface of the first large diameter section and the inner circumferential surface of the first conductive rod body, and a second step is provided on the inner end surface of the second large diameter section.

[0013] Furthermore, the outer end surface of the first large diameter section and the outer end surface of the second large diameter section are respectively flush with the corresponding end surfaces of the rod body.

[0014] Furthermore, the rod core is a hollow rod having an axially penetrating inner hole.

[0015] Furthermore, the welding between the first large diameter section and the first conductive rod body is a first vacuum brazing, and the welding between the second large diameter section and the second conductive rod body is a second vacuum brazing.

[0016] Compared with the prior art, the present invention has the following beneficial effects: a high-strength conductive rod for a vacuum interrupter of the present invention comprises a rod body comprising at least two sections of conductive rod bodies, and any two adjacent sections of the conductive rod bodies are also welded and fixed at the same time; at the same time, the rod core axially penetrates the rod body along the axial through hole and forms a welding area between the inner circumferential side surfaces at both ends of the rod body, so that the two ends of the rod body are completely welded to the rod core, and finally the rod body and the rod core form a welded whole, which can form a high fixing strength between the rod core and the rod body; at the same time, a special-shaped groove for accommodating solder is provided on the outer circumferential side surface corresponding to the welding area on the rod core, and after the solder wire melts, it can flow along the inclined surface to the welding area between the rod core and the rod body, so that the rod core and the rod body are completely welded, ensuring the weld strength between the rod body and the rod core, thereby effectively improving the mechanical strength of the conductive rod and ensuring that the mechanical life requirements of the vacuum interrupter are met.

[0017] One end of the rod core is provided with a first large diameter section that cooperates with the first conductive rod body at one end of the rod body, and a second large diameter section that cooperates with the second conductive rod body at the other end of the rod body is provided on the rod core at a position away from the first large diameter section. The special-shaped grooves are provided on the first large diameter section and the second large diameter section so that the outer peripheral side surfaces of the first large diameter section and the second large diameter section are welding areas, thereby improving the matching strength between the rod body and the rod core.

[0018] A countersunk hole is provided at one end of the first conductive rod body, and the first large diameter section is positioned radially along the first conductive rod body in the countersunk hole, so that the first large diameter section and the countersunk hole are engaged along the axial stop of the rod body, which can increase the contact area between the rod body and the rod core, and the radial positioning and axial stop cooperation are more reliable axially and the structural strength is higher.

[0019] The second conductive rod body is matched with its adjacent conductive rod body in the axial stop manner of the rod body, and is matched with the second large diameter section in the radial positioning manner of the rod body, which can improve the reliability of the axial stop and radial positioning between the rod body and the rod core.

[0020] A first step is provided between the inner end face of the first large diameter section and the inner circumferential surface of the first conductive rod body, and a second step is provided on the inner end face of the second large diameter section, which can improve the fluidity of the solder after melting in the special-shaped groove and make the first large diameter section and the first conductive rod body fit tightly and be welded.

[0021] The rod core is a hollow rod with an axially penetrating inner hole, which is beneficial to reducing the weight of the conductive rod.

[0022] The welding between the first large diameter section and the first conductive rod body is first vacuum brazing, and the welding between the second large diameter section and the second conductive rod body is second vacuum brazing, which prevents stress release during the welding process from causing poor welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a high-strength conductive rod for a vacuum interrupter according to an embodiment of the present application;

[0024] Figure 2 Schematic diagram of the structure of a conductive rod body I in a high-strength conductive rod for a vacuum interrupter according to an embodiment of the present application;

[0025] Figure 3 Schematic diagram of the structure of a steel core in a high-strength conductive rod for a vacuum interrupter according to an embodiment of the present application;

[0026] Figure 4 Schematic diagram of the structure of a conductive rod body II in a high-strength conductive rod for a vacuum interrupter according to an embodiment of the present application;

[0027] Figure 5 This is a schematic structural diagram of a conductive rod after the first vacuum brazing in a high-strength conductive rod for a vacuum interrupter according to an embodiment of the present application;

[0028] In the figure: 1. conductive rod body I, 2. steel core, 3. conductive rod body II, 4. first large diameter section, 5. second large diameter section, 6. countersunk hole, 7. first step, 8. inner hole, 9. trapezoidal groove. DETAILED DESCRIPTION

[0029] As cited in the background art, the conductive rod used in the vacuum interrupter in the prior art is prone to deformation during the opening and closing operation of the switch. Therefore, the utility model provides a high-strength conductive rod for the vacuum interrupter, comprising a rod body, the rod body having an axial through-hole, forming a hollow structure for accommodating a rod core; a rod core is arranged in the axial through-hole, for strengthening the strength of the conductive rod; the rod body comprises at least two sections of conductive rod bodies, the conductive rod bodies are arranged axially along the rod body, and any two adjacent sections of the conductive rod bodies are welded and fixed to form a high-strength rod body; the rod core axially penetrates the rod body along the axial through-hole and forms a welding area between the inner circumferential side surfaces of the two ends of the rod body, thereby achieving high-strength welding and fixing of the two ends of the rod body to the rod core, thereby improving the fixing strength; a special-shaped groove for accommodating solder is provided on the outer circumferential side surface corresponding to the welding area of ​​the rod core, and the solder melts in the special-shaped groove and flows to the welding area between the rod core and the rod body, so that the rod core and the rod body are completely welded, ensuring the strength of the weld between the rod body and the rod core, thereby effectively improving the mechanical strength of the conductive rod and ensuring that the mechanical life requirements of the vacuum interrupter are met.

[0030] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0031] It should be noted that the relational terms such as "first" and "second" that may appear in the specific embodiments of the present invention are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof that may appear are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or device. In the absence of further restrictions, the phrase "including a..." that defines an element does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0032] The following combination Figure 1 , the high-strength conductive rod for the vacuum interrupter provided in this application is described in detail. Figure 1 This is a schematic structural diagram of a high-strength conductive rod for a vacuum interrupter according to an embodiment of the present application.

[0033] The utility model provides a high-strength conductive rod for a vacuum interrupter, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 As shown: It includes a rod body, the rod body is provided with an axial through hole to form a hollow structure, a rod core is provided in the axial through hole, the rod body includes two sections of conductive rod bodies, the two sections of conductive rod bodies are arranged axially along the rod body and are welded and fixed between the two sections of conductive rod bodies, the rod core axially penetrates the rod body along the axial through hole and forms a welding area between the inner circumferential side surfaces at both ends of the rod body, and a special-shaped groove for accommodating solder is provided on the outer circumferential side surface corresponding to the welding area on the rod core. After the solder melts in the special-shaped groove, it can flow to the welding area between the rod core and the rod body, so that the rod core and the rod body are completely welded, thereby ensuring the welding strength.

[0034] Specifically, the special-shaped groove is a trapezoidal groove 9. The two sections of the conductive rod body are respectively the first conductive rod body and the second conductive rod body, namely, conductive rod body I1 and conductive rod body II3. Conductive rod body I1 is made of copper, which has good conductivity but slightly lower strength. The rod core is made of stainless steel, which has good mechanical strength. The outer side of the reinforced conductive rod is welded together from two sections of copper conductive rod body. The inner side is a single steel core 2, and the side surfaces of the steel core 2 are welded to the two outer sections of copper conductive rod body. A first large diameter section 4 is provided at one end of the rod core, which mates with conductive rod body I1 at one end of the rod body. A second large diameter section 5 is provided on the rod core, away from the first large diameter section 4, which mates with conductive rod body II3 at the other end of the rod body. The trapezoidal groove 9 is provided on the first and second large diameter sections 4, so that the outer circumferences of the first and second large diameter sections 4, 5, serve as welding areas for close fit and welding with the two sections of the conductive rod body. Simultaneously, the lower end of conductive rod body II3 contacts and welds with the upper end surface of conductive rod body I1.

[0035] In other embodiments, the rod body includes four sections of conductive rod bodies, which are arranged axially along the rod body and are welded and fixed between any two adjacent sections of the conductive rod bodies. The two sections of the conductive rod bodies at both ends of the four sections of the conductive rod body are respectively welded and fixed to the first large diameter section 4 and the second large diameter section 5.

[0036] Specific embodiment 2 of the high-strength conductive rod for vacuum interrupter of the utility model:

[0037] Based on the technical concept of the present invention described above, or based on the specific embodiments of the present invention described above, another embodiment is provided below.

[0038] like Figure 2 As shown, in this embodiment, a countersunk hole 6 is provided at one end of the conductive rod body I1, and the first large diameter section 4 is positioned radially within the countersunk hole 6 along the conductive rod body I1, so that the first large diameter section 4 and the countersunk hole 6 are axially retained by the rod body. That is, the outer diameter of the first large diameter section 4 is matched with the inner diameter of the conductive rod body I1, so that the conductive rod body I1 is tightly fitted with the steel core 2 and welded together, thereby increasing the contact area between the rod body and the rod core, making the radial positioning and axial retaining fit more reliable, and increasing the structural strength. The conductive rod body II3 is axially retained by the conductive rod body I1 and radially positioned with the second large diameter section 5 along the rod body. The conductive rod body II3 has no internal countersunk hole and is tightly fitted with the steel core 2 and welded together as a whole, thereby improving the reliability of the axial retaining fit and radial positioning fit between the rod body and the rod core.

[0039] like Figure 3As shown, in this embodiment, the axial dimension of the first large diameter section 4 is equal to the axial dimension of the counterbore 6, and the axial dimension of the second large diameter section 5 is smaller than and equal to the axial dimension of the conductive rod body II3. The outer end faces of the first large diameter section 4 and the second large diameter section 5 are flush with the corresponding end faces of the rod body. A first step 7 is provided between the inner end face of the first large diameter section 4 and the inner circumference of the first conductive rod body, ensuring a tight fit between the first large diameter section 4 and the first conductive rod body. A second step is provided on the inner end face of the second large diameter section 5 to improve the fluidity of the solder after melting in the special-shaped groove, ensuring a tight fit and welding between the first large diameter section and the first conductive rod body.

[0040] In other embodiments, the outer end face of the first large diameter section 4 is flush with the corresponding end face of the rod body, and the outer end face of the second large diameter section 5 extends out from the corresponding end face of the rod body, and the extended portion can be provided with corresponding connection dimensions or threads.

[0041] In other embodiments, the axial dimension of the first large diameter section 4 is different from the axial dimension of the second large diameter section 5 .

[0042] Specific embodiment 3 of the high-strength conductive rod for vacuum interrupter of the utility model:

[0043] Based on the technical concept of the present invention described above, or based on the specific embodiments of the present invention described above, another embodiment is provided below.

[0044] In this embodiment, the rod core is a hollow rod with an axially through inner hole 8, which is beneficial to reducing the weight of the conductive rod; the welding between the first large diameter section 4 and the first conductive rod body is the first vacuum brazing, and the welding between the second large diameter section 5 and the second conductive rod body is the second vacuum brazing, that is, in order to prevent stress release during the welding process from causing poor welding, two vacuum brazings are required.

[0045] In other embodiments, the core may be a solid rod.

[0046] The installation process of the high-strength conductive rod for the vacuum interrupter of the utility model is as follows:

[0047] First, the steel core 2 is placed inside the conductive rod body I1, that is, the first large diameter section 4 of the steel core 2 is positioned in the countersunk hole 6 of the conductive rod body I1. A solder wire is placed in the trapezoidal groove 9 on the first large diameter section 4 at the lower end of the steel core 2, and a first vacuum brazing is performed to weld the inner diameter of the conductive rod body I1 to the steel core 2, thereby obtaining an assembly of the conductive rod body I1 and the steel core 2.

[0048] Secondly, the conductive rod body II3 is placed on the conductive rod body I1, and the steel core 2 is used to position it in the circumferential direction. Solder is placed between the conductive rod body I1 and the conductive rod body II3. At the same time, solder wire is placed in the trapezoidal groove 9 of the welding part of the second largest diameter section 5 at the upper end of the steel core 2, and a second vacuum brazing is performed to complete the welding of the inner diameter of the conductive rod body II3 and the outer diameter of the steel core 2, and the lower end face of the conductive rod body II3 and the upper end face of the conductive rod body I1 at the same time, thereby obtaining the final high-strength conductive rod.

[0049] Through the above description of the specific embodiment of the high-strength conductive rod for a vacuum interrupter of the utility model, it can be seen that the high-strength conductive rod for a vacuum interrupter of the utility model includes a rod body, the rod body is provided with an axial through hole to form a hollow structure for accommodating a rod core; a rod core is provided in the axial through hole to strengthen the strength of the conductive rod; the rod body includes at least two sections of conductive rod bodies, the conductive rod bodies are arranged axially along the rod body and any two adjacent sections of the conductive rod bodies are welded and fixed to form a high-strength rod body; the rod core axially penetrates the rod body along the axial through hole and forms a welding area between the inner circumferential side surfaces of the two ends of the rod body, thereby realizing high-strength welding and fixing of the two ends of the rod body to the rod core, thereby improving its fixing strength; a special-shaped groove for accommodating solder is provided on the outer circumferential side surface corresponding to the welding area on the rod core, and the solder melts in the special-shaped groove and can flow to the welding area between the rod core and the rod body, so that the rod core and the rod body are completely welded, ensuring the strength of the weld between the conductive rod and the rod core, thereby effectively improving the mechanical strength of the conductive rod and ensuring that the mechanical life requirements of the vacuum interrupter are met.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall also be included in the scope of protection of the present invention.

Claims

1. A high-strength conductive rod for a vacuum interrupter, comprising a rod body, wherein the rod body is provided with an axial through hole to form a hollow structure, and a rod core is provided in the axial through hole, characterized in that: The rod body includes at least two sections of conductive rod bodies, which are arranged axially along the rod body and are welded and fixed between any two adjacent sections of the conductive rod body. The rod core axially penetrates the rod body along the axial through hole and forms a welding area between the inner circumferential side surfaces at both ends of the rod body. A special-shaped groove for accommodating solder is provided on the outer circumferential side surface corresponding to the welding area on the rod core. After the solder melts in the special-shaped groove, it can flow to the welding area between the rod core and the rod body, so that the rod core and the rod body are completely welded.

2. The high-strength conductive rod for vacuum interrupter according to claim 1, characterized in that: One end of the rod core is provided with a first large diameter section (4) that cooperates with a first conductive rod body at one end of the rod body, and a second large diameter section (5) that cooperates with a second conductive rod body at the other end of the rod body is provided on the rod core at a position away from the first large diameter section (4). The special-shaped grooves are provided on the first large diameter section (4) and the second large diameter section (5) so that the outer peripheral side surfaces of the first large diameter section (4) and the second large diameter section (5) serve as welding areas.

3. The high-strength conductive rod for vacuum interrupter according to claim 2, characterized in that: A countersunk hole (6) is provided at one end of the first conductive rod body, and the first large diameter section (4) is positioned in the countersunk hole (6) along the radial direction of the first conductive rod body, so that the first large diameter section (4) and the countersunk hole (6) are engaged in an axial stop manner along the rod body.

4. The high-strength conductive rod for a vacuum interrupter according to claim 3, characterized in that: The second conductive rod body is matched with its adjacent conductive rod body in an axial blocking manner along the rod body, and is matched with the second large diameter section (5) in a radial positioning manner along the rod body.

5. The high-strength conductive rod for vacuum interrupter according to claim 4, characterized in that: The axial dimension of the first large diameter section (4) is equal to the axial dimension of the counterbore (6), and the axial dimension of the second large diameter section (5) is smaller than the axial dimension of the second conductive rod body.

6. The high-strength conductive rod for vacuum interrupter according to claim 5, characterized in that: The axial dimension of the first large diameter section (4) is the same as the axial dimension of the second large diameter section (5).

7. The high-strength conductive rod for a vacuum interrupter according to claim 6, characterized in that: A first step (7) is provided between the inner end surface of the first large diameter section (4) and the inner circumferential surface of the first conductive rod body, and a second step is provided on the inner end surface of the second large diameter section (5).

8. The high-strength conductive rod for a vacuum interrupter according to claim 7, characterized in that: The outer end surface of the first large diameter section (4) and the outer end surface of the second large diameter section (5) are respectively flush with the corresponding end surfaces of the rod body.

9. The high-strength conductive rod for a vacuum interrupter according to claim 8, characterized in that: The rod core is a hollow rod having an axially penetrating inner hole (8).

10. The high-strength conductive rod for a vacuum interrupter according to any one of claims 2 to 9, characterized in that: The welding between the first large diameter section (4) and the first conductive rod body is a first vacuum brazing, and the welding between the second large diameter section (5) and the second conductive rod body is a second vacuum brazing.

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