High-voltage isolating switch based on Tesla valve

Abstract

The invention discloses a high-voltage isolation switch based on a Tesla valve, and the switch comprises a moving contact which is internally provided with a moving side guide rod capable of moving relative to the moving contact, and the moving side guide rod can slide out of the moving contact and is in contact with a static contact; the static contact is used for being mounted at the top end of a post insulator; wherein the movable side guide rod is of a hollow structure with two open ends, a Tesla-like valve structure is arranged in the movable side guide rod, the Tesla-like valve structure is communicated with the two ends of the movable side guide rod, and during opening, the insulating gas and the arc extinguishing gas can flow towards the arcing position through the Tesla-like valve structure so as to assist in extinguishing the arc; during closing, the similar Tesla valve structure can form resistance to reverse flowing of insulation and arc extinguishing gas, and gas pressure is established. The high-voltage isolation switch can reduce operation work, reduce arc drift faults, simplify the structure and improve reliability, has important practical significance, and belongs to the technical field of isolation switches.

Description

Technical Field

[0001] This invention relates to the field of disconnector technology, and in particular to a high-voltage disconnector based on a Tesla valve. Background Technology

[0002] High-voltage disconnect switches are important switching devices in power systems. They are mainly used to create a clear disconnection point in the circuit to ensure the safety of maintenance work, and can also be used in conjunction with circuit breakers to control the circuit. During the opening and closing operations of high-voltage disconnect switches, an electric arc will be generated between the contacts. If the arc is not extinguished in a timely and effective manner, it may lead to equipment damage and the expansion of faults.

[0003] Currently, most high-voltage disconnect switches use a direct-pull principle for arc extinguishing. During the opening process, significant operating power is required to drive the contacts apart and extinguish the arc. Simultaneously, during arc extinguishing, the arc is prone to drift, deviating from the preset extinguishing area, leading to equipment failure. To improve arc extinguishing effectiveness, some disconnect switches incorporate vents, one-way valves, and other structures to ensure proper flow and pressure control of insulating and arc-extinguishing gases. However, the addition of these structures increases the overall structural complexity of the disconnect switch and reduces its reliability. Summary of the Invention

[0004] To address the above shortcomings, this invention provides a high-voltage disconnecting switch based on a Tesla valve. This high-voltage disconnecting switch, which can reduce operating power, reduce arc drift faults, simplify the structure, and improve reliability, has significant practical implications.

[0005] The specific technical solution is as follows: A high-voltage disconnecting switch based on a Tesla valve includes: a moving contact, within which a movable side guide rod is provided that can move relative to the moving contact, the movable side guide rod being able to slide out from the moving contact and contact a stationary contact; and a stationary contact, which is used to install on the top of a post insulator; wherein, the movable side guide rod is a hollow structure with open ends, and a Tesla-like valve structure is provided inside the movable side guide rod, the Tesla-like valve structure connecting the two ends of the movable side guide rod; when the switch is open, insulating gas and arc-extinguishing gas can flow towards the arc-starting position through the Tesla-like valve structure to assist in extinguishing the arc; when the switch is closed, the Tesla-like valve structure can create resistance to the reverse flow of insulating and arc-extinguishing gases, establishing gas pressure.

[0006] Preferably, the Tesla-like valve structure includes multiple sequentially connected flow guiding units, which are interconnected.

[0007] Preferably, each flow guiding unit includes a main flow channel and at least one side flow channel at a preset angle to the main flow channel.

[0008] Preferably, both ends of the side channel are connected to the main channel.

[0009] Preferably, the side channel is a curved channel.

[0010] Preferably, the preset angle is 30°-60°.

[0011] Preferably, the Tesla-like valve structure is embedded in the moving side guide rod.

[0012] Preferably, the Tesla-like valve structure is integrally formed with the moving side guide rod.

[0013] Preferably, when the Tesla-like valve structure is embedded in the moving side guide rod, all the flow guiding units of the Tesla-like valve structure are fixed in the cylinder, and the cross section of the cylinder is adapted to the interior of the moving side guide rod.

[0014] Preferably, when the Tesla-like valve structure and the moving side guide rod are integrally formed, the moving side guide rod includes a first part and a second part. The first part and the second part are respectively processed with the shape structure of a Tesla-like valve structure. When the first part and the second part are molded together, the Tesla-like valve structure processed by the first part and the Tesla-like valve structure processed by the second part are connected to form a Tesla-like valve structure. The first part and the second part are fixed by an end plate and screws. The end plate is provided with a vent hole.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The high-voltage disconnect switch of the present invention has a Tesla-like valve structure installed in the moving side guide rod. When the switch is tripped, the structure is similar to "opening", allowing insulating and arc-extinguishing gases to be blown directly to the arc-starting position, which can effectively assist in extinguishing the arc, reduce arc drift, and reduce the probability of equipment failure. At the same time, since the arc can be extinguished in time, the required operating power is also reduced accordingly.

[0016] During the closing process, the Tesla-like valve structure acts like a "closed" valve, creating resistance to the reverse flow of gas. This ensures the pressure of the insulating and arc-extinguishing gases is established, guaranteeing a smooth closing process while maintaining a certain degree of flow to prevent excessive pressure from adversely affecting the equipment.

[0017] High-voltage disconnect switches cleverly utilize the unidirectional flow characteristics of Tesla valves, eliminating the vent holes and one-way valve plates found in traditional disconnect switches. This simplifies the overall structure of the disconnect switch, reduces the number of parts, thereby improving the overall reliability of the equipment and lowering maintenance costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 This is a schematic diagram showing a high-voltage disconnector in the open state.

[0020] Figure 2 This is a schematic diagram showing a high-voltage disconnector in the closed state.

[0021] Figure 3 This is a schematic diagram of the moving side guide rod and its AA cross-sectional view.

[0022] Figure 4 A schematic diagram of a Tesla-like valve structure installed inside the moving-side guide rod.

[0023] 1 is the stationary contact, 2 is the moving contact, 3 is the moving side guide rod, 4 is a Tesla-like valve structure, 5 is the end plate, 6 is the vent hole, 7 is the screw, 8 is the main flow channel, and 9 is the side flow channel. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. Where the terms "first," "second," and "third" are used for descriptive purposes and to distinguish technical features, they should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Example 1 like Figures 1-4 As shown, this embodiment provides a high-pressure disconnect switch based on a Tesla valve, comprising: The moving contact 2 has a movable side guide rod 3 that can move relative to it. The movable side guide rod 3 can slide out of the moving contact 2 and contact the stationary contact 1. The stationary contact 1 is used to install on the top of the post insulator. The movable side guide rod 3 is hollow inside and open at both ends. The movable side guide rod 3 has a Tesla-like valve structure 4 inside. The Tesla-like valve structure 4 connects the two ends of the movable side guide rod 3. When the circuit is open, the insulating gas and the arc-extinguishing gas can flow towards the arc-starting position through the Tesla-like valve structure 4 to assist in extinguishing the arc. When the circuit is closed, the Tesla-like valve structure 4 can resist the reverse flow of the insulating and arc-extinguishing gases and establish gas pressure.

[0029] When the disconnecting switch is opened, the moving contact 2 moves away from the stationary contact 1, generating an electric arc between the stationary contact 1 and the moving contact 2. At this time, the insulating and arc-extinguishing gas (SF6 gas is used in this embodiment) flows towards the arc-starting position along the internal channel of the moving side guide rod 3 under pressure. Because the Tesla-like valve structure 4 exhibits low resistance characteristics in this flow direction, similar to an "open" state, the gas can smoothly pass through the Tesla-like valve structure 4 and be directly blown towards the arc-starting position, quickly extinguishing the arc, reducing arc drift, and lowering operating power.

[0030] When the disconnector switch is closed, the moving contact 2 moves towards the stationary contact 1. At this time, the gas flow direction is opposite to that during the opening operation. The Tesla-like valve structure 4 exhibits high resistance characteristics in this flow direction, similar to a "closed" state, hindering the gas flow. This ensures the pressure build-up of the insulating and arc-extinguishing gases inside the moving side guide rod 3 and related gas chambers, ensuring the stable operation of the closing process. Simultaneously, the Tesla-like valve structure 4 does not completely block gas flow, retaining a certain degree of permeability to prevent excessive gas pressure from damaging the equipment.

[0031] In some embodiments, the Tesla-like valve structure 4 includes a plurality of sequentially connected flow guiding units, which are interconnected with each other.

[0032] In some embodiments, each flow guiding unit includes a main flow channel 8 and at least one side flow channel 9 at a predetermined angle to the main flow channel 8.

[0033] In some embodiments, both ends of the side channel 9 are connected to the main channel 8.

[0034] In some embodiments, the side channel 9 is a curved channel. By configuring the side channel 9 as a curved channel, with both ends connected to the main channel 8, when the disconnecting switch is closed, the insulating and arc-extinguishing gases flowing in the curved channel will oppose the insulating and arc-extinguishing gases flowing in the main channel 8, thus creating an obstruction.

[0035] In some embodiments, the preset angle is 30°-60°. Specifically, the preset angle can be adjusted according to the actual gas flow rate and pressure requirements. In this embodiment, the preset angle is 45°. By setting a 45° side channel 9, the unidirectional flow guidance and pressure control functions can be best achieved. If the angle of the side channel 9 is less than 30 degrees or greater than 60 degrees, it cannot effectively obstruct the insulating and arc-extinguishing gases.

[0036] In some embodiments, the Tesla-like valve structure 4 is embedded within the moving side guide rod 3.

[0037] In some embodiments, the Tesla-like valve structure 4 and the moving side guide rod 3 are integrally formed. Specifically, the Tesla-like valve structure 4 and the moving side guide rod 3 are integrally formed, which can improve the overall integrity and stability of the structure.

[0038] In some embodiments, when the Tesla-like valve structure 4 is embedded in the moving-side guide rod 3, all the flow guiding units of the Tesla-like valve structure 4 are fixed inside the cylinder, and the cross-section of the cylinder is adapted to the interior of the moving-side guide rod 3. With this arrangement, the Tesla-like valve structure 4 becomes an independent component, embedded in the internal channel of the moving-side guide rod 3, which facilitates processing and replacement.

[0039] In some embodiments, when the Tesla-like valve structure 4 and the moving side guide rod 3 are integrally formed, the moving side guide rod 3 includes a first part and a second part. The first part and the second part are respectively processed to form the shape of the Tesla-like valve structure 4. When the first part and the second part are molded together, the Tesla-like valve structure 4 processed by the first part and the Tesla-like valve structure 4 processed by the second part are joined together to form the Tesla-like valve structure 4. The first part and the second part are fixed by the end plate 5 and the screw 7. The end plate 5 is provided with a vent hole 6.

[0040] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high voltage disconnector based on a Tesla valve, characterized in that, include: The moving contact has a movable side guide rod that can move relative to the moving contact. The movable side guide rod can slide out of the moving contact and contact the stationary contact. Stationary contact, used for installation on the top of post insulator; The moving side guide rod is hollow inside and open at both ends. A Tesla-like valve structure is installed inside the moving side guide rod. The Tesla-like valve structure connects the two ends of the moving side guide rod. When the circuit is open, the insulating gas and the arc-extinguishing gas can flow towards the arc-starting position through the Tesla-like valve structure to assist in extinguishing the arc. When the circuit is closed, the Tesla-like valve structure can create resistance to the reverse flow of the insulating and arc-extinguishing gases and establish gas pressure.

2. A high voltage disconnector based on a Tesla valve according to claim 1, characterized in that The Tesla-like valve structure includes multiple sequentially connected flow guiding units, which are interconnected.

3. A high voltage disconnector based on a Tesla valve according to claim 2, characterized in that Each flow guiding unit includes a main flow channel and at least one side flow channel at a preset angle to the main flow channel.

4. A high voltage disconnector based on a Tesla valve according to claim 3, characterized in that Both ends of the side channel are connected to the main channel.

5. A high voltage disconnector based on a Tesla valve according to claim 3, characterized in that The side channel is a curved channel.

6. A high voltage disconnector based on a Tesla valve according to claim 3, characterized in that The preset angle is 30°-60°.

7. A high voltage disconnector based on a Tesla valve according to claim 1, characterized in that The Tesla-like valve structure is embedded in the moving side guide rod.

8. A high voltage disconnector based on a Tesla valve according to claim 1, characterized in that The Tesla-like valve structure is integrally formed with the moving side guide rod.

9. A high voltage disconnector based on a Tesla valve according to claim 7, characterized in that When the Tesla-like valve structure is embedded in the moving side guide rod, all the flow guiding units of the Tesla-like valve structure are fixed in the cylinder, and the cross section of the cylinder is adapted to the interior of the moving side guide rod.

10. A high voltage disconnector based on a Tesla valve according to claim 8, characterized in that When the Tesla-like valve structure and the moving side guide rod are integrally formed, the moving side guide rod includes a first part and a second part. The first part and the second part are respectively processed with the shape of the Tesla-like valve structure. When the first part and the second part are molded together, the Tesla-like valve structure processed by the first part and the Tesla-like valve structure processed by the second part are connected to form the Tesla-like valve structure. The first part and the second part are fixed by end plates and screws. The end plates are provided with vent holes.

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