High-efficiency electrical contact low-cost grounding knife tube assembly of disconnecting switch

Abstract

The utility model relates to a high-efficiency electrical contact low-cost ground knife tube assembly of an isolating switch, which comprises a conductive tube main body, an oblate end part and silver plating parts, the conductive tube main body is arranged to be a circular tube, the upper end of the conductive tube main body is arranged to be the oblate end part, two sides of the oblate end part are relatively narrow, and the silver plating parts are respectively arranged at positions for contact. The grounding switch tube has the advantages that the design is ingenious, the structure is reasonable and compact, the head of the grounding switch tube is flattened and designed into the oblate end part, the identification is obvious, the silver plating parts on the two sides are locally plated with silver, and the silver plating amount is saved; the silver-plated parts on the two sides are in line contact with the grounding knife contact fingers, virtual connection is avoided, local heating is avoided, and the detection qualified rate of the detection mechanism reaches the standard.

Description

Technical Field

[0001] The utility model relates to the field of production and processing of disconnectors, and particularly relates to a grounding knife tube assembly of a low-cost disconnector with efficient electrical contact. Background Art

[0002] The disconnector is one of the most used high-voltage switch appliances. As the name implies, it plays an isolation role in the circuit. Its working principle and structure are relatively simple. However, due to its large usage and high requirement for working reliability, it has a great impact on the design, construction and safe operation of substations and power plants. The main feature of the knife switch is that it has no arc extinguishing ability and can only switch the circuit on and off without load current.

[0003] The grounding knife tube assembly, which is a key component of the disconnector, is usually designed as a circular tube. To ensure the contact performance of its head, it is required to silver-plate the entire circumference of the head of the grounding knife tube. In actual use, only the two sides of the head of the grounding knife tube are in contact with the grounding knife finger contacts, and silver plating at the remaining positions causes waste and cannot be utilized. To save materials, only the contact positions on both sides of the grounding knife tube are silver-plated. However, when the processed grounding knife tube is sent to a professional testing institution for testing, it is found to be unqualified because the equipment of the testing institution cannot distinguish the silver-plated positions. Sometimes, the detected contact positions are the positions without silver plating, resulting in unqualified products and unable to effectively solve the problem of silver plating waste. Summary of the Utility Model

[0004] In order to solve the above technical problems, the utility model provides a grounding knife tube assembly of a low-cost disconnector with efficient electrical contact, which has a clever design and a reasonable and compact structure. By designing the head of the grounding knife tube to be oblate, only the relatively wide two sides need to be silver-plated, thus saving the silver plating cost.

[0005] The technical solution of the utility model is as follows:

[0006] A grounding knife tube assembly of a low-cost disconnector with efficient electrical contact, which comprises a conductive tube body, an oblate end portion, and a silver-plated portion. The conductive tube body is set as a circular tube, the upper end of the conductive tube body is set as the oblate end portion, and the two relatively narrow and contact positions on both sides of the oblate end portion are respectively provided with a silver-plated portion.

[0007] The silver-plated portion is a strip-shaped arc-shaped coating, the arc-shaped width of the coating is 8 mm, the length of the coating is 60 mm, and the thickness of the coating is 20 μm.

[0008] The lower end of the conductive tube body is designed with a mounting hole.

[0009] The lower end of the conductive tube body within a length range of 80 mm is plated with a 10-μm tin plating layer.

[0010] The overall length of the conductive tube body is 600 mm, the diameter at the circular tube position is 35 mm, the flat circular end is elliptical in shape, the length of the flat circular end is 60 mm, and the major diameter of the flat circular end is 40 + 0.1 mm.

[0011] The conductive tube body is a drawn aluminum tube or a copper tube with a surface anodic oxidation treatment.

[0012] A processing technology for the grounding knife tube assembly of a low-cost disconnect switch with efficient electrical contact. According to the above-mentioned processing technology for the grounding knife tube assembly of a low-cost disconnect switch with efficient electrical contact,

[0013] Step 1: Select the conductive tube body and perform anodic oxidation treatment on the entire conductive tube body.

[0014] Step 2: Drill holes at the lower end of the conductive tube body, and form a flat circular end at the upper end of the conductive tube body by cold pressing.

[0015] Step 3: Remove the oxide layer from the parts on both sides of the flat circular end for silver plating, and seal the non-silver-plated parts with glue.

[0016] Step 4: Silver-plate the silver-plated parts in Step 3.

[0017] Step 5: After silver plating is completed, remove the glued parts; then tin-plate the lower end of the conductive tube body.

[0018] During the cold pressing forming, an extrusion die is used to extrude the upper end of the conductive tube body. The extrusion die includes a lower die and an upper die. In the middle of the upper surface of the lower die, a rectangular groove is opened. One side of the rectangular groove is designed with an opening. The depth of the edge of the rectangular groove is 8 mm, and the bottom of the rectangular groove is designed with an arc-shaped groove bottom; in the middle of the lower surface of the upper die, an arc-shaped groove is designed.

[0019] The advantages of the present utility model are ingenious design, reasonable and compact structure. By flattening the head of the grounding knife tube and designing it into a flat circular end, it has obvious recognition. The silver-plated parts on both sides are locally silver-plated, saving the amount of silver plating; when the silver-plated parts on both sides are in contact with the grounding knife finger, it is in a line contact mode, which will not cause problems of virtual connection or local heating, and the qualified rate detected by the detection mechanism meets the standard. Description of the Drawings

[0020] Figure 1 is the front view schematic diagram of the present utility model.

[0021] Figure 2 is the side view schematic diagram of the present utility model.

[0022] Figure 3 is the cross-sectional view schematic diagram of the flat circular end of the present utility model.

[0023] Figure 4It is a partial schematic diagram of the contact between the end of the grounding knife tube of the present utility model and the grounding knife finger.

[0024] Figure 5 It is a schematic diagram of the extrusion die in the present utility model.

[0025] Figure 6 It is Figure 5 the top view of the lower die in

[0026] Figure 7 It is Figure 5 the bottom view of the upper die in Specific embodiments

[0027] Referring to the attached Figures 1-7 A grounding knife tube assembly of a low-cost disconnector with efficient electrical contact, which includes a conductive tube body 1, an oval end 2, and a silver-plated part 3. The conductive tube body 1 is set as a circular tube, the upper end of the conductive tube body 1 is set as an oval end 2, and silver-plated parts 3 are respectively set at the relatively narrow and contacting positions on both sides of the oval end 2.

[0028] The silver-plated part 3 is a strip-shaped arc-shaped coating. The arc-shaped width of the coating is 8 mm, the length of the coating is 60 mm, and the thickness of the coating is 20 μm.

[0029] An installation hole is designed at the lower end of the conductive tube body 1.

[0030] A 10-μm tin-plated layer 4 is plated within a length range of 80 mm at the lower end of the conductive tube body 1. Tin plating can improve the conductivity.

[0031] The overall length of the conductive tube body 1 is 600 mm, the diameter of the circular tube position is 35 mm, the oval end 2 is in an oval shape, the length of the oval end 2 is 60 mm, and the major diameter of the oval end 2 is 40 + 0.1 mm.

[0032] The conductive tube body 1 is a drawn aluminum tube or a copper tube with surface anodic oxidation treatment.

[0033] A processing technology for the grounding knife tube assembly of a low-cost disconnector with efficient electrical contact. According to the above-mentioned processing technology for the grounding knife tube assembly of a low-cost disconnector with efficient electrical contact,

[0034] Step 1: Select the conductive tube body 1, and perform anodic oxidation treatment on the entire conductive tube body 1;

[0035] Step 2: Perform drilling on the lower end of the conductive tube body 1, and form the oval end 2 at the upper end of the conductive tube body 1 by cold pressing;

[0036] Step 3: Remove the oxide layer at the positions of the silver-plated parts 3 on both sides of the oval end 2, and seal the non-silver-plated parts 3 with glue;

[0037] Step 4: Silver plate the silver plating part 3 in Step 3.

[0038] Step 5: After silver plating is completed, remove the potting part; then tin plate the lower end of the conductive tube body 1.

[0039] During cold pressing and forming, an extrusion die is used to perform extrusion processing on the upper end of the conductive tube body 1. The extrusion die includes a lower die 11 and an upper die 12. In the middle of the upper surface of the lower die 11, a rectangular groove 111 is opened. On one side of the rectangular groove 111, an opening 112 is designed. The depth of the edge of the rectangular groove 111 is 8 mm, and the bottom of the rectangular groove 111 is designed with an arc-shaped groove bottom 113; in the middle of the lower surface of the upper die 12, an arc-shaped groove 121 is designed. The design of the extrusion die can effectively assist in processing the end of the conductive tube into an oval-shaped structure, saving time and effort.

[0040] During the processing of the present utility model, the original conductive tube is further processed, and the head is extruded into an oval end 2, which has obvious recognizability. After silver plating on both sides, the silver plating part 3 forms a linear contact with the ground knife finger 5, ensuring good contact performance and preventing the problem of local virtual connection causing heat generation. The performance of the detection mechanism meets the standard; in the past, the overall silver plating length around the head was 110 mm, and now it becomes 2 * 8 = 16 mm for the local parts on both sides, saving 85.5% of the original silver plating amount. The silver plating amount for plating one product in the past can now plate nearly 7 products, greatly reducing the production cost.

Claims

1. A grounding tube assembly of a low-cost isolating switch with high efficiency electrical contact, characterized in that: It includes a conductive tube body, an oblate end, and a silver-plated part. The conductive tube body is a circular tube, the upper end of the conductive tube body is an oblate end, and the two sides of the oblate end are relatively narrow and used for contact, respectively, and are a silver-plated part.

2. The grounding tube assembly of a low-cost isolating switch with high efficiency electrical contact according to claim 1, characterized in that: The silver-plated portion is a long arc-shaped coating, the arc-shaped width of the coating is 8 mm, the length of the coating is 60 mm, and the thickness of the coating is 20 μm.

3. The grounding tube assembly of a low-cost isolating switch with high efficiency electrical contact according to claim 1, characterized in that: The lower end of the conductive tube body is designed with a mounting hole.

4. The grounding tube assembly of a low-cost isolating switch with high efficiency electrical contact according to claim 1, characterized in that: The lower end of the conductive tube body is plated with a 10 μm tin layer within a length range of 80 mm.

5. The grounding tube assembly of a low-cost isolating switch with high efficiency electrical contact according to claim 1, characterized in that: The overall length of the conductive tube body is 600 mm, the diameter of the round tube is 35 mm, the oblate end is elliptical, the length of the oblate end is 60 mm, and the long diameter of the oblate end is 40+0.1 mm.

6. The grounding tube assembly of a low-cost isolating switch with high efficiency electrical contact according to claim 1, characterized in that: The conductive tube body is a drawn aluminum tube or a copper tube with an anodized surface.

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