A lightning protection cross contact structure

Abstract

The utility model discloses a lightning -proof cross -shaped groove contact structure relates to vacuum arc chamber technical field, including contact cup with contact piece and conducting rod and stainless steel support, the below of contact cup is provided with contact piece, the middle position of contact cup and contact piece is equipped with the through -hole and is fixedly connected with the locating ring pole, the middle position fixedly connected with conducting rod of locating ring pole, the outer wall fixedly connected with stainless steel support of locating ring pole, the both ends of stainless steel support are fixedly connected with contact cup and contact piece, one end outer wall of contact cup and contact piece all are cross -shaped and are equipped with L shape conducting groove, and stainless steel support and spring washer cooperate, and keep contact pressure stable, avoid the contact failure caused by thermal expansion, and the periphery of locating ring pole is equipped with axial straight groove, reduces eddy current loss, and first auxiliary conducting groove and second auxiliary conducting groove are mirror image symmetry relative to stainless steel support, ensure that current distribution is even, avoid the arc partial burning of magnetic field distortion.

Description

Technical Field

[0001] This utility model relates to the field of vacuum interrupter technology, specifically to a lightning protection swastika-groove contact structure. Background Technology

[0002] A vacuum interrupter is a specially designed device used for arc extinguishing in high-voltage electrical equipment. It eliminates the arc by creating a vacuum environment and uses a metal shielding cylinder for safety isolation and guidance. When a high-voltage current generates an arc, the vacuum interrupter can quickly create a vacuum environment to extinguish the arc, thereby preventing equipment damage and accidents. As a key component in the power system to resist lightning overvoltage, the performance of the surge protector directly affects the operational reliability of the equipment.

[0003] In devices such as high-voltage vacuum circuit breakers, the instantaneous large current generated by lightning strikes can cause the electric arc between contacts to be difficult to extinguish, local overheating and erosion, and even equipment failure. Although some swastika-shaped contact structures can guide the current through the design of the slot, they are mostly two-dimensional conductive paths such as unidirectional swastika-shaped slots or simple L-shaped slots. When lightning current strikes, local current concentration is easily formed at the intersection of the slots, which is difficult to meet the protection requirements of high-frequency lightning strike scenarios. Therefore, it is necessary to propose a lightning protection swastika-shaped contact structure. Utility Model Content

[0004] The purpose of this utility model is to provide a lightning protection swastika-shaped contact structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a lightning protection swastika-shaped contact structure, comprising a contact cup, a contact plate, a conductive rod, and a stainless steel bracket. The contact plate is disposed below the contact cup. A through hole is opened in the middle of the contact cup and the contact plate, and a positioning ring rod is fixedly connected thereto. A conductive rod is fixedly connected in the middle of the positioning ring rod. A stainless steel bracket is fixedly connected to the outer wall of the positioning ring rod. The two ends of the stainless steel bracket are respectively fixedly connected to the contact cup and the contact plate.

[0006] Both the contact cup and the contact piece have an L-shaped conductive groove formed in a cross shape on one end of their outer wall. The outer wall of the positioning ring rod has an axial straight groove that runs through it relative to the L-shaped conductive groove. The axial straight groove is connected to the L-shaped conductive groove. The outer wall of one end of the contact cup has a first auxiliary conductive groove formed in a circumferential shape relative to the center point. The outer wall of one end of the contact piece has a second auxiliary conductive groove formed in a circumferential shape relative to the center point.

[0007] Preferably, a spring washer is fixedly connected at the connection between the stainless steel bracket and the contact cup and contact piece.

[0008] Preferably, both the first auxiliary conductive groove and the second auxiliary conductive groove are Y-shaped and mirror-symmetrical with respect to the stainless steel support.

[0009] Preferably, the opening direction of the L-shaped conductive groove of the contact cup is opposite to the opening direction of the L-shaped conductive groove of the contact piece.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: the conductive rod is inserted into the positioning ring rod, and the contact cup, stainless steel bracket and contact piece are respectively inserted into the outside of the positioning ring rod for fixation. The stainless steel bracket and spring washer cooperate to maintain stable contact pressure and avoid contact failure caused by thermal expansion. Axial straight grooves are opened around the positioning ring rod to reduce eddy current loss. The first auxiliary conductive groove and the second auxiliary conductive groove are mirror symmetrical with respect to the stainless steel bracket to ensure uniform current distribution and avoid arc burning caused by magnetic field distortion. Attached Figure Description

[0011] Figure 1 This is a front view structural diagram of the present utility model;

[0012] Figure 2 This is a bottom view of the structure of this utility model;

[0013] Figure 3 This is a schematic diagram of the installation positions of the first auxiliary conductive groove and the second auxiliary conductive groove of this utility model;

[0014] Figure 4 This is a cross-sectional structural diagram of the present invention.

[0015] In the diagram: 1. Contact cup; 2. Contact plate; 3. Conductive rod; 4. Stainless steel bracket; 5. Positioning ring rod; 6. L-shaped conductive groove; 7. Axial straight groove; 8. First auxiliary conductive groove; 9. Second auxiliary conductive groove; 10. Spring washer. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-4 This utility model provides a technical solution:

[0018] Example 1: A lightning protection swastika-shaped contact structure includes a contact cup 1, a contact piece 2, a conductive rod 3, and a stainless steel bracket 4. The contact piece 2 is provided below the contact cup 1. A through hole is opened in the middle of the contact cup 1 and the contact piece 2 and a positioning ring rod 5 is fixedly connected thereto. The conductive rod 3 is fixedly connected in the middle of the positioning ring rod 5. The stainless steel bracket 4 is fixedly connected to the outer wall of the positioning ring rod 5. The two ends of the stainless steel bracket 4 are fixedly connected to the contact cup 1 and the contact piece 2, respectively.

[0019] Both the contact cup 1 and the contact piece 2 have L-shaped conductive grooves 6 formed in a cross shape on one end of their outer walls. The outer wall of the positioning ring rod 5 has an axial straight groove 7 that passes through the L-shaped conductive groove 6. The axial straight groove 7 is connected to the L-shaped conductive groove 6. The outer wall of one end of the contact cup 1 has a first auxiliary conductive groove 8 formed in a circumferential shape relative to the center point. The outer wall of one end of the contact piece 2 has a second auxiliary conductive groove 9 formed in a circumferential shape relative to the center point. The spring washer 10 is made of SUS301 stainless steel and is used to compensate for the decrease in contact force caused by the thermal expansion of the contact cup 1 and the contact piece 2. The positioning ring rod 5 is made of non-magnetic stainless steel. The depth of the first auxiliary conductive groove 8 and the second auxiliary conductive groove 9 is half the thickness of the contact. There are 6 L-shaped conductive grooves 6 and 6 axial straight grooves 7. There are 12 first auxiliary conductive grooves 8 and 12 second auxiliary conductive grooves 9.

[0020] In use, insert the conductive rod 3 into the positioning ring rod 5 for fixation. Insert the contact cup 1 into the outside of the conductive rod 3 for fixation. Place the spring washers 10 on both sides of the stainless steel bracket 4. Insert the stainless steel bracket 4 into the outside of the positioning ring rod 5 and abut against the contact cup 1. Insert the contact piece 2 into the outside of the positioning ring rod 5 for fixation, with the contact piece 2 abutting against the stainless steel bracket 4.

[0021] When the lightning current flows into the positioning ring rod 5 through the conductive rod 3, it is diverted through the 6 axial straight grooves 7 to the L-shaped conductive grooves 6 opened between the contact cup 1 and the contact plate 2. Since the opening directions of the L-shaped conductive grooves 6 are opposite, the current forms a longitudinal magnetic field in the contact gap, driving the arc to spread towards the edge of the contact. The 12 first auxiliary conductive grooves 8 and the second auxiliary conductive grooves 9 further decompose the current into 36 micropaths, reducing the current density of a single groove. Combined with the "cross + axial" composite channel of the L-shaped conductive grooves 6, the three-dimensional dispersion of the lightning current is achieved, thus achieving the lightning protection effect.

[0022] Meanwhile, the longitudinal magnetic field constrains the arc to rotate and burn at the edges of the contact cup 1 and the contact piece 2, avoiding central ablation. The branch structure of the first auxiliary conductive groove 8 and the second auxiliary conductive groove 9 accelerates the cooling of the arc, and the spring washer 10 compensates for the thermal expansion of the contact, maintaining stable contact pressure and ensuring that the contact resistance after lightning strike is ≤50μΩ.

[0023] Example 2: This example differs from Example 1 in its technical solution;

[0024] A spring washer 10 is fixedly connected at the connection between the stainless steel bracket 4, the contact cup 1, and the contact piece 2. The first auxiliary conductive groove 8 and the second auxiliary conductive groove 9 are both Y-shaped and mirror-symmetrical with respect to the stainless steel bracket 4. The opening direction of the L-shaped conductive groove 6 of the contact cup 1 is opposite to the opening direction of the L-shaped conductive groove 6 of the contact piece 2.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lightning protection swastika-shaped contact structure, comprising a contact cup (1), a contact piece (2), a conductive rod (3), and a stainless steel bracket (4), wherein the contact cup (1) is provided with a contact piece (2) below it, a through hole is provided in the middle of the contact cup (1) and the contact piece (2) and a positioning ring rod (5) is fixedly connected thereto, the middle of the positioning ring rod (5) is fixedly connected with a conductive rod (3), and the outer wall of the positioning ring rod (5) is fixedly connected with a stainless steel bracket (4), and the two ends of the stainless steel bracket (4) are fixedly connected to the contact cup (1) and the contact piece (2) respectively; characterized in that The outer wall of one end of the contact cup (1) and the contact piece (2) is provided with an L-shaped conductive groove (6) in a cross shape. The outer wall of the positioning ring rod (5) is provided with an axial straight groove (7) at the position of the L-shaped conductive groove (6). The axial straight groove (7) is connected to the L-shaped conductive groove (6). The outer wall of one end of the contact cup (1) is provided with a first auxiliary conductive groove (8) in a circumferential shape relative to the center point. The outer wall of one end of the contact piece (2) is provided with a second auxiliary conductive groove (9) in a circumferential shape relative to the center point.

2. The lightning protection cross contact structure according to claim 1, characterized in that: A spring washer (10) is fixedly connected at the connection between the stainless steel bracket (4), the contact cup (1), and the contact piece (2).

3. The lightning protection swastika-groove contact structure according to claim 1, characterized in that: The first auxiliary conductive groove (8) and the second auxiliary conductive groove (9) are both Y-shaped and mirror-symmetrical with respect to the stainless steel bracket (4).

4. The lightning protection swastika-groove contact structure according to claim 1, characterized in that: The opening direction of the L-shaped conductive groove (6) of the contact cup (1) is opposite to the opening direction of the L-shaped conductive groove (6) of the contact piece (2).

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