Conducting rod structure of vacuum arc-extinguishing chamber

Abstract

The utility model relates to the technical field of vacuum arc-extinguishing chambers, and discloses a conducting rod structure of a vacuum arc-extinguishing chamber, which comprises a conducting rod main body, one end of the conducting rod main body is connected with a contact, and the conducting rod main body is made of oxygen-free copper materials. A stainless steel shielding cover is welded on the periphery of the conducting rod main body. According to the conducting rod structure of the vacuum arc-extinguishing chamber, the stainless steel shielding cover is welded on the periphery of the conducting rod main body, so that the requirement on defects on the surface of the oxygen-free copper conducting rod main body can be lowered, the stainless steel material is high in strength and is not easy to damage in the transportation process, and the surface glossiness of the stainless steel shielding cover is uniform and lasting; the appearance quality of the workpiece is greatly improved, electric field distortion caused by local microcosmic burr defects is reduced due to the smooth and flat surface, and the compression strength of the arc extinguish chamber is improved.

Description

Technical Field

[0001] This utility model relates to the field of vacuum interrupter technology, specifically to a conductive rod structure for a vacuum interrupter. Background Technology

[0002] Oxygen-free copper is widely used in vacuum interrupters due to its excellent electrical and thermal conductivity, weldability, superior plasticity and ductility, good cold working properties, and non-magnetic properties. As an important component of vacuum interrupters, the conductive rod is often made of oxygen-free copper. However, because oxygen-free copper is relatively soft, its surface is easily damaged during processing, transportation, and cleaning, resulting in microscopic burrs on the surface. This uneven surface condition can destroy the integrity of the oxygen-free copper surface, making it easier for oxygen to be adsorbed and penetrate, thereby accelerating the oxidation reaction locally. This is extremely detrimental to vacuum interrupters.

[0003] To address surface defects in oxygen-free copper conductive rods, pickling is often employed. While pickling can remove oxides and other impurities from the oxygen-free copper surface, over-pickling or improper pickling processes can negatively impact the physical properties of the oxygen-free copper (such as strength and conductivity). For instance, excessive pickling can lead to over-corrosion of the oxygen-free copper surface, resulting in material loss and performance degradation; conversely, under-pickling may fail to completely remove surface oxides or impurities, affecting subsequent processing or performance. Utility Model Content

[0004] This invention provides a conductive rod structure for a vacuum interrupter, aiming to solve the problem in the prior art where the surface factors of the oxygen-free copper conductive rod affect the internal insulation strength of the vacuum interrupter.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A conductive rod structure for a vacuum interrupter includes a conductive rod body, one end of which is connected to a contact head. The conductive rod body is made of oxygen-free copper material; a stainless steel shield is welded to the outer periphery of the conductive rod body.

[0007] As a preferred technical solution, a safe distance is maintained between the stainless steel shield and the contact.

[0008] As a preferred technical solution, the stainless steel shield is spaced 3-5 mm from the contact.

[0009] As a preferred technical solution, the surface of the stainless steel shield is treated with electropolishing.

[0010] As a preferred technical solution, the thickness of the stainless steel shielding cover is 0.5 to 1 mm.

[0011] As a preferred technical solution, the thickness of the stainless steel shielding cover is 0.5mm, 0.6mm, 0.8mm, or 1.0mm.

[0012] As a preferred technical solution, the stainless steel shielding cover is brazed to the conductive rod body.

[0013] The beneficial effects of this utility model are as follows:

[0014] The conductive rod structure of this invention's vacuum interrupter utilizes a stainless steel shield welded to the outer periphery of the conductive rod body. This allows for more lenient requirements on the surface defects of the oxygen-free copper conductive rod body. Stainless steel boasts high strength, making it less prone to damage during transportation, and the stainless steel shield provides a uniform and durable gloss. Furthermore, the surface of the stainless steel shield undergoes electropolishing, achieving a very high degree of flatness and smoothness, reaching a mirror-like finish and significantly improving the workpiece's appearance. The smooth, flat surface also reduces electric field distortion caused by localized microscopic burr defects, enhancing the interrupter's pressure resistance. In terms of material properties, stainless steel exhibits better pressure resistance and a higher breakdown field strength than oxygen-free copper.

[0015] This invention can reduce the surface requirements of oxygen-free copper conductive rods, reduce the pickling time of oxygen-free copper conductive rods, and compared with the pickling process, the yield of stainless steel parts subjected to electropolishing process is better than that of pickled oxygen-free copper parts, thus reducing the losses caused by scrap. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0018] Reference numerals: 1-Conductive rod body, 2-Contact, 3-Stainless steel shield. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0020] A conductive rod structure for a vacuum interrupter includes a conductive rod body 1, one end of which is connected to a contact 2. The conductive rod body 1 is made of oxygen-free copper material. A stainless steel shield 3 is welded to the outer periphery of the conductive rod body 1, and a safe distance is left between the stainless steel shield 3 and the contact 2.

[0021] Preferably, the stainless steel shielding cover 3 is brazed to the conductive rod body 1, and the thickness of the stainless steel shielding cover 3 is 0.5-1mm, preferably 0.5mm, 0.6mm, 0.8mm, or 1.0mm. Preferably, the surface of the stainless steel shielding cover 3 is electropolished.

[0022] Furthermore, the stainless steel shield 3 is spaced 3-5 mm apart from the contact 2.

[0023] The conductive rod structure of this invention's vacuum interrupter utilizes a stainless steel shield welded to the outer periphery of the conductive rod body. This allows for more lenient requirements on the surface defects of the oxygen-free copper conductive rod body. The high strength of stainless steel makes it less prone to damage during transportation. Furthermore, the electropolishing treatment of the stainless steel shield surface achieves extremely high flatness and smoothness, reaching a mirror-like finish with uniform and lasting gloss, significantly improving the appearance quality of the workpiece. The smooth, flat surface also reduces electric field distortion caused by localized microscopic burr defects, thereby increasing the pressure resistance of the interrupter.

[0024] This invention reduces the surface requirements for oxygen-free copper conductive rods and decreases the pickling time. Furthermore, compared to pickling, electropolishing of stainless steel parts yields a higher success rate than pickled oxygen-free copper parts, reducing losses from scrap. In terms of material properties, stainless steel has better pressure resistance and a higher breakdown field strength than oxygen-free copper.

[0025] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A conductive rod structure of a vacuum interrupter, comprising a conductive rod body, one end of the conductive rod body being connected to a contact, the conductive rod body being made of oxygen-free copper material; characterized in that: The conductive rod body is welded with a stainless steel shielding cover; the surface of the stainless steel shielding cover is treated by electric polishing, and the thickness of the stainless steel shielding cover is 0.5-1 mm.

2. The conductive stem structure of a vacuum interrupter according to claim 1, characterized in that: The stainless steel shielding cover is kept a safe distance from the contact.

3. The conductive stem structure of a vacuum interrupter according to claim 2, characterized in that: The stainless steel shielding cover is kept 3-5 mm away from the contact.

4. The conductive stem structure of a vacuum interrupter according to claim 1, wherein: The thickness of the stainless steel shielding cover is 0.5 mm, 0.6 mm, 0.8 mm or 1.0 mm.

5. The conductive stem structure of a vacuum interrupter according to claim 1, wherein: The stainless steel shielding cover is connected with the conductive rod body by brazing.

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