A vacuum isolation arc extinguishing device

Abstract

The present invention discloses a vacuum isolation arc extinguishing device, comprising a switch base and a moving end insulating sleeve, a static end insulating sleeve, a static contact, a moving contact, an incoming terminal, an outgoing terminal, a grounding conductor, a bellows and an operating mechanism. The present invention realizes opening and closing by arranging the static contact and the moving contact in a vacuum sealed switch tube composed of the static end insulating sleeve, the moving end insulating sleeve and the bellows, thereby avoiding the rust of the contact. Furthermore, the static contact and the moving contact are connected to the ground through the static end insulating sleeve and the moving end insulating sleeve and the metal sleeve ring arranged in the middle of the vacuum sealed switch tube, respectively, so that there is no solid insulating material penetrating between the moving and static contact fractures, thereby avoiding the generation of leakage current between the fractures. Finally, the switch arc extinguishing and insulation adopt a vacuum switch tube, which meets the reliability requirements of circuit closing and breaking and safe isolation, increases the switch fracture opening distance, and can meet the needs of various types of vacuum switch equipment.

Description

Technical Field

[0001] The invention relates to the technical field of power switches, and in particular to a vacuum isolation arc extinguishing device. Background Art

[0002] At present, the disconnectors are mostly insulated by air or SF6 gas. The air insulation performance is average, requiring a relatively large distance between the disconnection and the insulation distance between the live body and the ground. The SF6 gas insulation performance is relatively good, but it is more harmful to the environment. Most of these two types of disconnectors use isolation knives or spring contacts to connect and isolate the circuit. When the switch is opened and closed, the sliding friction of the contacts will cause the contact surface to wear, affecting the conductive contact performance, and the mechanical life is also limited.

[0003] Vacuum circuit breakers and load switches use vacuum interrupter chambers to close and open circuits. They have good arc extinguishing performance, but the opening distance of the breaks is relatively small, which cannot meet the safety distance required for the circuit isolation break. In addition, there is leakage current between the breaks after the switch is disconnected. They can only be used as circuit breakers and load switches, and cannot be used as isolation switches. Since the vacuum circuit breaker has a relatively small opening distance, it is easy to reignite when switching on and off the capacitor bank, causing accidents.

[0004] The vacuum switch tube cannot withstand the impact of operation and needs to be insulated and cast into a sealed pole or additionally supported by insulation. The manufacturing process is relatively complicated. If the interface is not properly handled during casting, local discharge and insulation breakdown may occur.

[0005] Vacuum circuit breakers and load switches must be connected in series with isolating switches to form multi-break combination switches in order to meet the requirements of circuit on-off and safe isolation. Outdoor pole-mounted vacuum circuit breakers cannot have built-in isolating switches. Isolating switches are exposed to the air and are greatly affected by the environment. Switch contacts are easily corroded, resulting in poor contact and stuck opening and closing operations. Poor contact contact can cause switch burning accidents, and stuck opening and closing contacts can cause refusal to operate and inability to perform electric operation. The combination switch is relatively large in size and requires two operating mechanisms to operate separately. The operation is relatively cumbersome, and an interlocking device is required to prevent misoperation. These factors are not conducive to the rapid positioning and removal of distribution network automation faults, rapid self-healing and power restoration, and are not conducive to the development of intelligent power switch equipment and the power Internet of Things. Summary of the invention

[0006] The object of the present invention is to provide a vacuum isolation arc extinguishing device which can meet the reliability requirements of circuit closing and breaking and safe isolation, and can avoid rusting of switch contacts and prolong service life.

[0007] The technical solution adopted by the present invention is:

[0008] A vacuum isolation arc extinguishing device, comprising a switch base and a moving end insulating sleeve, a static end insulating sleeve, a static contact, a moving contact, an incoming terminal, an outgoing terminal, a grounding conductor, a bellows and an operating mechanism arranged on the switch base; the moving end insulating sleeve is vertically arranged on the switch base, the bottom of the moving end insulating sleeve is fixedly connected to the switch base, and the top of the moving end insulating sleeve is sealed and connected to the lower end of the static end insulating sleeve through a metal sleeve ring; the static contact is fixedly and sealedly arranged on the upper end of the static end insulating sleeve, and the moving contact is fixedly arranged on the moving end insulating sleeve. At the top of the conductive rod, the upper end of the bellows is sealed and fixedly sleeved on the upper part of the dynamic conductive rod, and the lower end is sealed and connected to the insulating sleeve of the dynamic end; the lower end of the dynamic conductive rod is fixedly connected to the output shaft of the operating mechanism through the insulating pull rod and the contact spring in sequence, and the operating mechanism is fixedly arranged on the switch base; it also includes a flexible connection and a static conductive rod, one end of the flexible connection is fixedly connected to one end of the static conductive rod, and the other end is connected to the lower end of the dynamic conductive rod, and the other end of the static conductive rod passes through the insulating sleeve of the dynamic end and is connected to the outlet terminal, and the metal ring is grounded through the grounding conductor.

[0009] It also includes a transverse partition, which is horizontally fixed inside the moving end insulating sleeve and is sealed to the inner wall of the moving end insulating sleeve 8. The bottom of the bellows is sealed and fixed to the transverse partition, and the moving conductive rod is set through the transverse partition.

[0010] The utility model also comprises a shielding cover which is fixed inside the insulating sleeve of the static end.

[0011] The distance between the moving contact and the static contact when opening is greater than the contact opening distance of the existing vacuum circuit breaker and vacuum load switch.

[0012] The lower end of the metal conductor is fixedly connected to the switch base.

[0013] The moving end insulating sleeve and the static end insulating sleeve are both thick-walled insulating vacuum switch tubes with increased creepage distance.

[0014] The bottom of the moving end insulating sleeve is sealed with the switch base.

[0015] The static conductive rod and the moving end insulating sleeve are sealed.

[0016] The present invention realizes opening and closing by arranging the static contact and the moving contact in a vacuum sealed switch tube composed of a static end insulating sleeve, a moving end insulating sleeve and a bellows, thereby avoiding rusting of the contacts. Furthermore, the static contact and the moving contact are connected to the ground through the static end insulating sleeve and the moving end insulating sleeve respectively with the metal sleeve ring arranged in the middle of the vacuum sealed switch tube, thereby realizing that there is no solid insulating material penetrating between the moving and static contact breaks, thereby avoiding the generation of leakage current between the breaks. Finally, a vacuum switch tube is used for each phase of the switch arc extinguishing and insulation, which meets the reliability requirements of circuit closing and breaking and safe isolation, increases the switch break opening distance, and can meet the needs of various types of vacuum switch equipment such as vacuum isolating switches, vacuum isolating circuit breakers, and vacuum isolating load switches. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1As shown, the present invention includes a switch base 16 and a moving end insulating sleeve 8, a static end insulating sleeve 3, a static contact 2, a moving contact 5, an incoming terminal 1, an outgoing terminal 13, a grounding conductor 7, a bellows 9 and an operating mechanism 17 arranged on the switch base 16; the moving end insulating sleeve 8 is vertically arranged on the switch base 16, the bottom of the moving end insulating sleeve 8 is fixedly connected to the switch base 16, and the top of the moving end insulating sleeve 8 is sealed and connected to the lower end of the static end insulating sleeve 3 through a metal collar 6; the static contact 2 is fixedly and sealedly arranged on the upper end of the static end insulating sleeve 3, and the moving contact 5 is fixedly arranged on the moving conductive rod 10. At the top, the upper end of the bellows 9 is sealed and fixedly sleeved on the upper part of the moving conductive rod 10, and the lower end is sealed and connected to the moving end insulating sleeve 8; the lower end of the moving conductive rod 10 is fixedly connected to the output shaft of the operating mechanism 17 through the insulating pull rod 14 and the contact spring 15 in turn, and the operating mechanism 17 is fixedly arranged on the switch base 16; it also includes a flexible connection 11 and a static conductive rod 12, one end of the flexible connection 11 is fixedly connected to one end of the static conductive rod 12, and the other end is connected to the lower end of the moving conductive rod 10, and the other end of the static conductive rod 12 passes through the moving end insulating sleeve 8 and is connected to the outlet terminal 13, and the metal ring 6 is grounded through the grounding conductor 7.

[0021] It also includes a diaphragm 18, which is horizontally fixed inside the moving end insulating sleeve 8, and the diaphragm 18 is sealed with the inner wall of the moving end insulating sleeve 8, the bottom of the bellows 9 is sealed and fixed with the diaphragm 18, and the moving conductive rod 10 is arranged through the diaphragm 18. The diaphragm 18 can be a metal plate or an insulating plate; in actual use, the diaphragm 18 and the moving end insulating sleeve 8 can be integrated, which makes the process simpler and the vacuum environment better.

[0022] The shielding cover 4 is also included, and the shielding cover 4 is fixed inside the static end insulating sleeve 3. The shielding cover 4 can well achieve arc extinguishing. The lower end of the grounding conductor 7 is fixedly connected to the switch base 16 and then grounded. Since most switch bases are

[0023] It is a grounding setting, so here the grounding conductor 7 is directly fixedly connected to the switch base 16, which can not only achieve grounding, but also make the whole device beautiful. The moving end insulation sleeve and the static end insulation sleeve are thick-walled insulation vacuum switch tubes with increased creepage distance, which can directly withstand the impact force of the switch opening and closing operation. The switch tube does not need to cast the insulation support for the second time, which simplifies and saves the manufacturing process and production cost and avoids the hidden danger of insulation breakdown accidents.

[0024] When the present invention is used, Figure 1As shown: the static contact 2 of the vacuum isolation arc extinguishing device is fixed to the upper end of the static end insulating sleeve 3 and then sealed, the incoming terminal 1 and the static contact 2 are fixedly connected, the shielding cover 4 is fixed inside the static end insulating sleeve 3, the lower part of the static end insulating sleeve tube 3 is fixedly and sealedly connected to the metal collar 6, the moving contact 5 is fixedly connected to the moving conductive rod 10, the upper end of the bellows 9 is sealedly connected to the moving conductive rod 10, the lower end of the bellows 9 is sealedly connected to the moving end insulating sleeve 8, the upper end of the moving end insulating sleeve 8 is fixedly and sealedly connected to the metal collar 6, the upper end of the grounding conductor 7 is fixedly connected to the metal collar 6, and the lower end of the grounding conductor 7 is fixedly connected to the switch base 16 It is grounded after connection, one end of the soft connection 11 is fixedly connected to the moving conductive rod 10, and the other end is fixedly connected to the outgoing conductive rod 12, the outgoing terminal 13 is fixedly connected to the conductive rod 12 passing through the moving end insulating sleeve 8, the insulating pull rod 14 passes through one end of the soft connection 11 and is fixedly connected to the moving conductive rod 10, and the other end is fixedly connected to the operating mechanism 17 after being covered with the contact spring 15, the chamber where the static contact 2 and the moving contact 5 are located is a vacuum environment, when the switch is opened and closed, the operating mechanism 17 drives the moving conductive rod 10 and the moving contact 5 to move linearly through the insulating pull rod 14, and the moving contact 5 is separated or closed from the static contact 2 to realize the switch opening and closing operation. The arc formed by the switch opening is extinguished in the shielding cover 4 when the circuit passes through zero. The static contact 2 and the moving contact 5 will only have leakage current to the ground, and there will be no leakage current between the contact breaks. After the static contact 2 and the moving contact 5 are opened, a safe and reliable isolation break is formed. One vacuum break can complete the arc extinguishing and safety isolation functions, realizing the integration of switch equipment such as circuit breakers or load switches and isolation switches, and the integrated design of the multifunctional switch equipment structure.

[0025] Compared with the prior art, the vacuum switch device of the present invention has a simple structure, and the switch functions and structures are simplified and combined into one. A single-break switch can have the functions of the original isolating switch and circuit breaker, which solves the problem that the outdoor pole-mounted vacuum circuit breaker cannot have a built-in isolating switch; the switch only needs one operating mechanism and does not require a mechanical interlocking device. The switch is small in size, simple in structure, and easy to operate, which blocks the possibility of misoperation of the switch; the problems of conductive contact performance and mechanical life of the isolating switch contacts are solved, so that the isolating switch reaches the same performance indicators as the vacuum circuit breaker; the switch meets the break distance and insulation requirements required for safe isolation; it has excellent breaking performance and a safe isolating break after breaking, and will not reignite after breaking, so it is particularly suitable for use as a switch for switching capacitor groups; the switch has good insulation performance, energy saving and emission reduction, low carbon and environmental protection, and is of great significance to improving our living environment and sustainable social development.

[0026] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions and positional relationships based on the directions or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific protection scope of the present invention.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] Note that the above are only preferred embodiments of the present invention and the principles of the application technology. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the specific embodiments described herein, and may include more other effective embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A vacuum isolation arc extinguishing device, characterized in that: The utility model comprises a switch base and a moving end insulating sleeve, a static end insulating sleeve, a static contact, a moving contact, an incoming terminal, an outgoing terminal, a grounding conductor, a bellows and an operating mechanism arranged on the switch base; the moving end insulating sleeve is vertically arranged on the switch base, the bottom of the moving end insulating sleeve is fixedly connected to the switch base, and the top of the moving end insulating sleeve is sealed and connected to the lower end of the static end insulating sleeve through a metal sleeve ring; the static contact is fixedly and sealedly arranged on the upper end of the static end insulating sleeve, the moving contact is fixedly arranged on the top of the moving conductive rod, the upper end of the bellows is sealed and fixedly sleeved on the upper part of the moving conductive rod, and the lower end is sealed and connected to the moving end insulating sleeve; the lower end of the moving conductive rod is fixedly connected to the output shaft of the operating mechanism through an insulating pull rod and a contact spring in turn, and the operating mechanism is fixedly arranged on the switch base; the utility model also comprises a flexible connection and a static conductive rod, one end of the flexible connection is fixedly connected to one end of the static conductive rod, and the other end is connected to the lower end of the moving conductive rod, the other end of the static conductive rod passes through the moving end insulating sleeve and is connected to the outgoing terminal, and the metal sleeve ring is grounded through a grounding conductor.

2. The vacuum isolation arc extinguishing device according to claim 1, characterized in that: It also includes a transverse partition, which is horizontally fixed inside the moving end insulating sleeve and sealed to the inner wall of the moving end insulating sleeve. The bottom of the bellows is sealed and fixed to the transverse partition, and the moving conductive rod is arranged through the transverse partition.

3. The vacuum isolation arc extinguishing device according to claim 1, characterized in that: The utility model also comprises a shielding cover which is fixed inside the insulating sleeve of the static end.

4. The vacuum isolation arc extinguishing device according to claim 1, characterized in that: The distance between the moving contact and the static contact when opening is greater than the contact opening distance of the existing vacuum circuit breaker and vacuum load switch.

5. The vacuum isolation arc extinguishing device according to claim 1, characterized in that: The lower end of the grounding conductor is fixedly connected to the switch base.

6. The vacuum isolation arc extinguishing device according to claim 1, characterized in that: The moving end insulating sleeve and the static end insulating sleeve are both thick-walled insulating vacuum switch tubes with increased creepage distance.

7. The vacuum isolation arc extinguishing device according to any one of claims 1 to 6, characterized in that: The bottom of the moving end insulating sleeve is sealed with the switch base.

8. The vacuum isolation arc extinguishing device according to claim 7, characterized in that: The static conductive rod and the moving end insulating sleeve are sealed.

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