Class-C fast grounding switch of environment-friendly gas medium

Abstract

The invention discloses an environment-friendly gas medium type-C fast grounding switch, which belongs to the technical field of high-voltage switches and comprises a shell, a gas cavity is arranged in the shell, a transmission rod is arranged in the gas cavity, a first sealing ring is fixedly connected to the outer side of the transmission rod, and the transmission rod is in sliding connection with the gas cavity through the first sealing ring. The end portion of the transmission rod is connected with a movable arc contact, the movable arc contact is a tubular contact, an arc extinguishing pipeline is arranged in the transmission rod, one end of the arc extinguishing pipeline is communicated with the movable arc contact, the end, away from the movable arc contact, of the arc extinguishing pipeline is communicated with the arc extinguishing cavity, and a one-way air valve is arranged on the air cavity. The one-way air valve is communicated with the arc extinguishing cavity, and the moving arc contact reciprocates, so that a pressure difference is formed between the arc extinguishing cavity and gas in the shell. The device is reasonable in structure, stable in insulation performance, reliable in movement, high in ablation resistance and capable of opening and closing line induction current under a friendly gas medium.

Description

Technical Field

[0001] The invention belongs to the technical field of high - voltage switches, and particularly relates to a type - C fast earthing switch with an environmentally friendly gas medium. Background Art

[0002] At present, with the rapid development of power construction, the power grid is constantly expanding and its capacity is also increasing. High - voltage wires are often used in long - distance and multi - circuit applications on the same tower. This requires the fast earthing switch to have the earthing switch ability of type - C. However, the structures of current fast earthing switches are roughly the same, all using the connection method of moving arc contacts and petal - type finger contacts. This connection method has insufficient contact tightness and weak ablation resistance, and cannot meet the requirements of type - C.

[0003] Therefore, it is urgent to design a type - C fast earthing switch with an environmentally friendly gas medium to solve the problem of weak ablation resistance mentioned above. Summary of the Invention

[0004] To solve the technical problem of weak ablation resistance mentioned in the background art, a type - C fast earthing switch with an environmentally friendly gas medium is provided to solve the above problems.

[0005] To achieve the above purpose, the specific technical solution of the type - C fast earthing switch with an environmentally friendly gas medium of the present invention is as follows: A type - C fast earthing switch with an environmentally friendly gas medium includes a housing. An air cavity is provided inside the housing. A transmission rod is arranged inside the air cavity. A first sealing ring is fixedly connected to the outside of the transmission rod. The transmission rod is slidably connected to the air cavity through the first sealing ring, so as to form an arc - extinguishing cavity between the first sealing ring and the air cavity. The end of the transmission rod is connected with a moving arc contact. The moving arc contact is a tubular contact. An arc - extinguishing pipeline is opened inside the transmission rod. One end of the arc - extinguishing pipeline is communicated with the moving arc contact, and the end of the arc - extinguishing pipeline far from the moving arc contact is communicated with the arc - extinguishing cavity. A one - way air valve is opened on the air cavity. The one - way air valve is communicated with the arc - extinguishing cavity. The moving arc contact reciprocates, causing a pressure difference to be formed between the arc - extinguishing cavity and the gas inside the housing. When closing the switch, the arc - extinguishing cavity sucks air, the one - way air valve opens, the moving arc contact contacts the static arc contact seat, and the circuit is closed. When opening the switch, the one - way air valve closes, and the gas in the arc - extinguishing cavity jets air towards the moving arc contact through the arc - extinguishing pipeline to achieve arc - extinguishing of the moving arc contact, and the circuit is disconnected.

[0006] Further, a first insulating plate is fixedly connected to the housing. The housing is fixedly connected to the air cavity through the first insulating plate.

[0007] Further, a grounding insulator is connected to the housing. The grounding insulator is connected to the air cavity.

[0008] Further, the grounding insulator and the air cavity are connected through a copper bar.

[0009] Further, a watch band contact finger is provided on the air cavity. The watch band contact finger is slidably connected to the transmission rod to ground the current on the transmission rod through the watch band contact finger.

[0010] Further, a guide ring is provided on the air cavity. The guide ring is slidably connected to the transmission rod, so as to cooperate with the first sealing ring to guide the transmission rod.

[0011] Further, a shielding ring is provided at one end of the air cavity close to the static arc contact seat to uniform the electric field.

[0012] Further, a threaded second insulating plate is threadedly connected to one end of the transmission rod away from the moving arc contact. A transmission plate is fixedly connected to one end of the second insulating plate away from the transmission rod. One end of the transmission plate away from the second insulating plate is fixedly connected to the crank arm through a needle roller bearing.

[0013] Further, the static arc contact seat includes a base. The base is bolted to the conductor. A shielding cover is fixedly connected to the base. A collar is provided inside the shielding cover. A static arc contact is connected to the collar. The outside of the static arc contact is fitted to the shielding cover. The inside of the static arc contact is used for connecting and conducting electricity with the moving arc contact. Contact fingers are arranged inside the collar. The contact fingers are connected to the collar through springs. After the static arc contact is connected to the moving arc contact, the contact fingers press against the outer wall of the moving arc contact to fasten the moving arc contact.

[0014] Further, the static arc contact is made of copper tungsten material, and the contact position between the contact finger and the moving arc contact is made of copper tungsten material.

[0015] The class C fast earthing switch with an environment-friendly gas medium of the present invention has the following advantages: The present invention solves the problem that the existing earthing switch cannot meet the requirements of electromagnetic switching class C tests when using an environment-friendly gas. By combining the pneumatic arc extinguishing structure on the fast earthing switch structure, the arcing time is within half a cycle, and the performance is stable and reliable.

[0016] The structure of the present invention is reasonable, the insulation performance is stable, the movement is reliable, the ablation resistance ability is strong, and it can switch the line induction current under the friendly gas medium. Brief Description of the Drawings

[0017] Figure 1 is the opening schematic diagram of the class C fast earthing switch with an environment-friendly gas medium of the present invention; Figure 2 is the schematic diagram of the air cavity structure of the present invention; Figure 3 is the schematic diagram of the internal structure of the static arc contact seat of the present invention; Figure 4 is the closing schematic diagram of the class C fast earthing switch with an environment-friendly gas medium of the present invention.

[0018] Description of the reference numerals in the figures: 1. Housing; 2. Gas chamber; 201. Watchband contact finger; 202. Guide ring; 203. Shielding ring; 3. Transmission rod; 301. Arc extinguishing pipeline; 4. First sealing ring; 5. Arc extinguishing cavity; 6. Moving arc contact; 7. One-way gas valve; 8. Static arc contact base; 801. Base; 802. Shielding cover; 803. Collar; 804. Static arc contact; 805. Contact finger; 806. Spring; 9. First insulating plate; 10. Grounding insulator; 11. Copper busbar; 12. Second insulating plate; 13. Transmission plate; 14. Needle roller bearing; 15. Conductor. Detailed implementation manners

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Those skilled in the art can understand that although some of the embodiments herein include some features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present invention and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0021] The following refers to the attached Figure 1 to the attached Figure 4 Describe the Class C fast earthing switch with an environment-friendly gas medium of the present invention.

[0022] The current structures of fast earthing switches are generally the same, all of which are the engagement mode between the moving arc contact 6 and the plum blossom contact finger. This engagement mode has insufficient contact tightness and weak ablation resistance, and cannot meet the requirements of Class C.

[0023] Therefore, the present invention provides a Class C fast earthing switch with an environment-friendly gas medium, as shown in Figure 1 and Figure 2As shown in the figure, it includes a housing 1. An air chamber 2 is provided inside the housing 1. A transmission rod 3 is provided inside the air chamber 2. A first sealing ring 4 is fixedly connected to the outside of the transmission rod 3. The transmission rod 3 is slidably connected to the air chamber 2 through the first sealing ring 4, so that an arc extinguishing cavity 5 is formed between the first sealing ring 4 and the air chamber 2. The end of the transmission rod 3 is connected to a moving arc contact 6. The moving arc contact 6 is a tubular contact. An arc extinguishing pipeline 301 is opened inside the transmission rod 3. One end of the arc extinguishing pipeline 301 is communicated with the moving arc contact 6, and the end of the arc extinguishing pipeline 301 far from the moving arc contact 6 is communicated with the arc extinguishing cavity 5. A one-way air valve 7 is opened on the air chamber 2. The one-way air valve 7 is communicated with the arc extinguishing cavity 5. The moving arc contact 6 reciprocates to form a pressure difference between the arc extinguishing cavity 5 and the gas inside the housing 1 to realize the opening and closing of the valve of the one-way air valve 7. When closing the switch, the arc extinguishing cavity 5 inhales air, and the one-way air valve 7 opens. The moving arc contact 6 contacts the static arc contact seat 8, and the circuit is closed; when opening the switch, the one-way air valve 7 closes, and the gas inside the arc extinguishing cavity 5 jets air to the moving arc contact 6 through the arc extinguishing pipeline 301 to realize arc extinguishing of the moving arc contact 6, and the circuit is disconnected. Specifically, when closing the switch, the one-way air valve 7 opens, and the arc extinguishing cavity 5 inhales air through the one-way air valve 7, as Figure 1 shown, the circuit is closed; when opening the switch, the gas inside the arc extinguishing cavity 5 is jetted to the moving arc contact 6 through the arc extinguishing pipeline 301 to eliminate the reaction force inside the air chamber 2, as Figure 4 shown, so that the closing is faster, so that the arcing time is within half a cycle, with stable and reliable performance, and further ensures the safety and reliability of circuit disconnection, thus solving the problems that the contact between the moving arc contact 6 and the plum blossom finger in the traditional fast earthing switch is not tight enough and the anti-erosion ability is weak, and meets the performance requirements of Class C fast earthing switch.

[0024] Preferably, the transmission rod 3 is made of 6063-T6 round aluminum rod, and the air chamber 2 is made of aluminum tube, so as to ensure stable conductivity and smooth transmission of current. At the same time, aluminum has lower mass than other conductive materials, which is convenient for realizing the light weight of the device.

[0025] Preferably, the housing 1 is in the form of integral casting to ensure miniaturization inside. The overall outer surface of the housing 1 is in the form of an arc surface, with strong pressure-bearing capacity.

[0026] Preferably, a first insulating plate 9 is fixedly connected to the housing 1. The housing 1 is fixedly connected to the air chamber 2 through the first insulating plate 9. The first insulating plate 9 provides stable support for the air chamber 2 while improving the safety and insulation of the equipment, preventing leakage or discharge phenomena, and ensuring the normal operation of the equipment.

[0027] Preferably, a grounding insulator 10 is connected to the housing 1. The grounding insulator 10 is connected to the air chamber 2, ensuring the safety of current during conduction, avoiding failures caused by leakage or discharge, and at the same time grounding the residual current in the cavity part after opening the switch, so as to ensure the stability of the equipment.

[0028] Preferably, the grounding insulator 10 is connected to the air cavity 2 through a copper busbar 11, which improves the conductive efficiency while maintaining the insulation performance. At the same time, the copper busbar 11 solves the problem that the toggle arm of the grounding switch in the form of flexible connection is affected by the flexible connection force during the mechanism energy storage, resulting in premature sliding. Compared with the flexible connection form, the use of the copper busbar 11 makes the mechanical characteristic curve more stable.

[0029] Preferably, as Figure 2 shown, the air cavity 2 is provided with a strap finger 201, and the strap finger 201 is slidably connected to the transmission rod 3 to ground the current on the transmission rod 3 through the strap finger 201, thereby providing a current discharge path on the air cavity 2, ensuring the safety of the equipment and personnel, ensuring that the current can flow safely to the ground, avoiding equipment damage caused by excessive current or short circuit, and at the same time, the use of the air cavity 2 for conduction also realizes efficient heat dissipation. Optionally, the number of strap fingers 201 can be arranged according to actual needs. In a specific embodiment, as Figure 2 shown, two strap fingers 201 are provided.

[0030] Preferably, the air cavity 2 is provided with a guide ring 202, and the guide ring 202 is slidably connected to the transmission rod 3, so as to cooperate with the first sealing ring 4 to guide the transmission rod 3, ensuring the linearity and stability of the movement of the transmission rod 3, and preventing faults or damages caused by the deviation of the transmission rod 3.

[0031] Preferably, a shielding ring 203 is provided at one end of the air cavity 2 close to the static arc contact seat 8 to uniform the electric field, minimize the stroke, reduce the possibility of partial discharge or flashover, thereby extending the service life of the equipment and reducing the maintenance cost.

[0032] Preferably, as Figure 1 shown, a threaded second insulating plate 12 is threadedly connected to one end of the transmission rod 3 away from the moving arc contact 6. One end of the second insulating plate 12 away from the transmission rod 3 is fixedly connected to a transmission plate 13. One end of the transmission plate 13 away from the second insulating plate 12 is fixedly connected to the toggle arm through a needle roller bearing 14. Specifically, the toggle arm and the transmission rod 3 are connected through a needle roller bearing 14, which improves the service life of the structure. At the same time, the use of the needle roller bearing 14 also reduces the cavity size of the housing 1, making it more economical and greatly saving costs; the transmission plate 13 is formed by welding a vacuum pressure impregnated epoxy glass cloth board and an aluminum alloy transmission part with bolts. At the same time, in cooperation with the second insulating plate 12, insulation from the transmission plate 13 to the toggle arm part is achieved, and the vacuum pressure impregnated epoxy glass cloth board has high strength, low density, good insulation performance, and strong arc resistance, reducing the structural quality.

[0033] Preferably, the static arc contact base 8 includes a base 801, which is bolted to the conductor 15. A shielding cover 802 is fixedly connected to the base 801. A collar 803 is provided inside the shielding cover 802. A static arc contact 804 is connected to the collar 803. The outer side of the static arc contact 804 is in contact with the shielding cover 802. The inner side of the static arc contact 804 is used to connect and conduct electricity with the moving arc contact 6. A finger 805 is arranged inside the collar 803 and is connected to the collar 803 through a spring 806. After the static arc contact 804 is connected to the moving arc contact 6, the finger 805 presses against the outer wall of the moving arc contact 6 to fasten the moving arc contact 6, thereby realizing the close contact and fastening of the moving arc contact 6, improving the conductivity and anti-erosion ability between the moving arc contact 6 and the static arc contact 804, enhancing the arc extinguishing ability and service life of the equipment, thus meeting the requirements of Class C fast earthing switches. At the same time, the static arc contact 804 is closely attached to the shielding cover 802, which not only optimizes the electric field but also saves costs.

[0034] Preferably, the static arc contact 804 is made of copper-tungsten material, and the contact position between the finger 805 and the moving arc contact 6 is made of copper-tungsten material, thereby further improving the short-circuit closing ability, the ability to cut off electrostatic induction and electromagnetic induction, and ensuring the stability and reliability under high-current conditions.

[0035] The Class C fast earthing switch with an environment-friendly gas medium of the present invention has the following advantages: The present invention solves the problem that the existing earthing switch cannot meet the requirements of the electromagnetic switching Class C test when using an environment-friendly gas. By combining the pneumatic arc extinguishing structure with the fast earthing switch structure, the arcing time is within half a cycle, and the performance is stable and reliable.

[0036] The structure of the present invention is reasonable, the insulation performance is stable, the movement is reliable, the anti-erosion ability is strong, and it can switch the line induction current under a friendly gas medium.

[0037] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A Class C quick earthing switch with an environment-friendly gas medium, characterized in that, It includes a housing. There is an air cavity inside the housing. A transmission rod is arranged in the air cavity. A first sealing ring is fixedly connected to the outside of the transmission rod. The transmission rod is slidably connected to the air cavity through the first sealing ring, so that an arc extinguishing cavity is formed between the first sealing ring and the air cavity. The end of the transmission rod is connected with a moving arc contact. The moving arc contact is a tubular contact. An arc extinguishing pipeline is opened inside the transmission rod. One end of the arc extinguishing pipeline is communicated with the moving arc contact, and the end of the arc extinguishing pipeline far from the moving arc contact is communicated with the arc extinguishing cavity. A one-way air valve is arranged on the air cavity. The one-way air valve is communicated with the arc extinguishing cavity. The moving arc contact reciprocates, so that a pressure difference is formed between the arc extinguishing cavity and the gas inside the housing. When closing the switch, the arc extinguishing cavity sucks air, the one-way air valve opens, the moving arc contact contacts the static arc contact seat, and the circuit is closed. When opening the switch, the one-way air valve closes, and the gas in the arc extinguishing cavity jets air to the moving arc contact through the arc extinguishing pipeline, realizing arc extinguishing of the moving arc contact, and the circuit is disconnected.

2. The Class C quick earthing switch with an environment-friendly gas medium according to claim 1, characterized in that, A first insulating plate is fixedly connected to the housing. The housing is fixedly connected to the air cavity through the first insulating plate.

3. The Class C quick earthing switch with an environment-friendly gas medium according to claim 1 or 2, characterized in that, A grounding insulator is connected to the housing. The grounding insulator is connected to the air cavity.

4. The Class C quick earthing switch with an environment-friendly gas medium according to claim 3, characterized in that, The grounding insulator and the air cavity are connected through a copper bar.

5. The Class C quick earthing switch with an environment-friendly gas medium according to claim 3, characterized in that, A strap contact finger is arranged on the air cavity. The strap contact finger is slidably connected to the transmission rod to ground the current on the transmission rod through the strap contact finger.

6. The Class C quick earthing switch with an environment-friendly gas medium according to claim 1, characterized in that A guide ring is arranged on the air cavity. The guide ring is slidably connected to the transmission rod, so as to cooperate with the first sealing ring to guide the transmission rod.

7. The Class C quick earthing switch with an environment-friendly gas medium according to claim 1, characterized in that, A shielding ring is arranged at one end of the air cavity close to the static arc contact seat to uniform the electric field.

8. The Class C quick earthing switch with an environment-friendly gas medium according to claim 1, characterized in that A threaded second insulating plate is threadedly connected to the end of the transmission rod far from the moving arc contact. A transmission plate is fixedly connected to the end of the second insulating plate far from the transmission rod. The end of the transmission plate far from the second insulating plate is fixedly connected to a crank arm through a needle bearing.

9. The Class C quick earthing switch with an environment-friendly gas medium according to claim 1, characterized in that, The static arc contact seat includes a base. The base is connected to a conductor through a bolt. A shielding cover is fixedly connected to the base. A sleeve ring is arranged inside the shielding cover. A static arc contact is connected to the sleeve ring. The outside of the static arc contact fits with the shielding cover. The inside of the static arc contact is used for connecting and conducting electricity with the moving arc contact. Contact fingers are arranged inside the sleeve ring. The contact fingers and the sleeve ring are connected through springs. After the static arc contact and the moving arc contact are connected, the contact fingers press against the outer wall of the moving arc contact to fasten the moving arc contact.

10. The Class C quick earthing switch with an environment-friendly gas medium according to claim 9, characterized in that, The static arc contact is made of copper tungsten material. The contact position between the contact finger and the moving arc contact is made of copper tungsten material.

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