Double-break vacuum circuit breaker

Abstract

The utility model belongs to the field of circuit breakers, and discloses a double-break vacuum circuit breaker, which comprises a circuit breaker body with two shells, a vacuum arc-extinguishing chamber is arranged in each shell, and the same transmission mechanism is adopted to be connected with the movable sides of the two vacuum arc-extinguishing chambers at the same time; the transmission mechanism is composed of a main crank arm movably connected with the operating mechanism, a main shaft is inserted into the main crank arm, driven crank arms are arranged at the two ends of the main shaft respectively, and each driven crank arm is movably connected with the movable side of one vacuum arc-extinguishing chamber; according to the circuit breaker, a transmission assembly is simplified, the number of transmission parts is reduced, and the motion inertia is reduced, so that the transmission efficiency is improved, and the loss of mechanism operation work is reduced; meanwhile, due to the reduction of transmission parts, the reliability of the product is correspondingly improved; the vacuum circuit breaker is simple in structure, high in reliability and stability and good in popularization and application value.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of circuit breaker, specifically relates to a double-break vacuum circuit breaker. BACKGROUND

[0002] In the low-voltage field, the vacuum circuit breaker occupies the main market with its superior arc-extinguishing performance, reliability, environmental protection and maintenance-free advantages; in the high-voltage field, especially 252kV and above voltage grade, since the voltage grade of the vacuum circuit breaker cannot meet the requirements, at present, SF6 circuit breaker occupies the dominant position, but SF6 as a greenhouse gas, many regions "ban fluorine order" all propose to limit the use of SF6. With the development of double-break vacuum circuit breaker theory and technology, the insulation characteristics saturation problem of vacuum long gap is solved, and the double-break vacuum circuit breaker will become the development trend of future high-voltage switch field.

[0003] However, the existing double-break circuit breaker mostly adopts crank arm and connecting plate transmission mode, and this kind of transmission assembly is complex, has more transmission parts, and has large movement inertia, so that it can result in low transmission efficiency and cause the loss of mechanism operating power; and too many transmission parts mean the reduction of reliability, and further affect the reliability of the product.

[0004] Therefore, the existing double-break vacuum circuit breaker has complex transmission assembly structure and large inertia, which results in low transmission efficiency and causes the loss of mechanism operating power. TECHNICAL PROBLEM

[0005] The utility model provides a double-break vacuum circuit breaker to solve the technical problem that the existing double-break vacuum circuit breaker has complex transmission assembly structure and large inertia, which results in low transmission efficiency and causes the loss of mechanism operating power.

[0006] In order to achieve the above purpose, the utility model adopts the following technical content:

[0007] A double-break vacuum circuit breaker, comprising a circuit breaker body;

[0008] The circuit breaker body comprises two housings; each housing is provided with a vacuum arc-extinguishing chamber;

[0009] Two vacuum arc-extinguishing chambers are connected with the same transmission mechanism on the moving side;

[0010] The transmission mechanism comprises a main crank arm movably connected with the operating mechanism;

[0011] The main crank arm is provided with a main shaft;

[0012] Both ends of the main shaft are provided with driven crank arms;

[0013] Each of the driven dorsi is respectively connected with the moving side of one of the vacuum interrupter.

[0014] Further, the transmission mechanism is symmetrically arranged around the main dorsi.

[0015] Further, the two driven dorsis are connected with the moving side of the vacuum interrupter through the insulating pull rod.

[0016] Further, the transmission mechanism is arranged on the top of the circuit breaker body.

[0017] Further, the transmission mechanism is fixed on the top of the two housings through the support plate.

[0018] Further, the operating mechanism is movably connected with the main dorsi through the mechanism connecting rod.

[0019] Further, the two ends of the main shaft are connected with the driven dorsis through the shaft coupling.

[0020] Further, the operating mechanism and the main dorsi and the driven dorsi and the moving side of the vacuum interrupter are movably connected through the pin shaft.

[0021] Further, the static side of the vacuum interrupter is arranged on the bottom wall of the housing through the insulating support.

[0022] Further, the moving side of the two vacuum interrupters is respectively connected with the outgoing conductor, and the static side of the two vacuum interrupters is connected in series through the connecting conductor.

[0023] Compared with the prior art, the utility model has the advantages of the following beneficial effects:

[0024] The utility model discloses a double-break vacuum circuit breaker, and the circuit breaker comprises a circuit breaker body with two housings, vacuum interrupters are arranged in each housing, and a same transmission mechanism is used to connect the moving side of the two vacuum interrupters simultaneously, the transmission mechanism is composed of a main dorsi movably connected with an operating mechanism, a main shaft is inserted in the main dorsi, driven dorsis are arranged at the two ends of the main shaft, and each driven dorsi is movably connected with the moving side of one vacuum interrupter.

[0025] In addition, the two vacuum interrupters are arranged in two independent housings, and compared with arranging the two vacuum interrupters in one housing, the product manufacturing and assembly are simpler.

[0026] Preferably, in the utility model, the left-right symmetrical transmission mechanism design can fully guarantee the simultaneity of the two breaking points, realize the synchronous opening or closing of the two breaking points, and make the structure of the entire circuit breaker more balanced and the stress distribution more uniform, thereby helping to reduce additional stress and wear caused by asymmetry and improving the stability and service life of the equipment.

[0027] Preferably, in the utility model, the use of the insulating pull rod ensures the electrical isolation between the driven crank arm and the dynamic side of the vacuum arc-extinguishing chamber, improves the safety of the equipment, and at the same time, the insulating pull rod also has a certain mechanical strength and can reliably transmit power.

[0028] Preferably, in the utility model, the transmission mechanism is arranged at the top of the circuit breaker body, which is convenient for maintenance and repair, and at the same time, helps to reduce the overall height of the circuit breaker, so that the equipment is more compact.

[0029] Preferably, in the utility model, the design of the support plate provides stable support for the transmission mechanism, ensures the stability and reliability of the transmission mechanism, and at the same time, the setting of the intermediate position also helps to balance the stress of the two vacuum arc-extinguishing chambers.

[0030] Preferably, in the utility model, the use of the mechanism connecting rod makes the connection between the operating mechanism and the main crank arm more flexible and reliable, and can adapt to the movement demand under different working conditions.

[0031] Preferably, in the utility model, the use of the shaft coupling makes the connection between the main shaft and the driven crank arm more firm and reliable.

[0032] Preferably, in the utility model, the design of the pin shaft connection makes the connection between the components more simple and flexible, and can adapt to the movement demand in different directions.

[0033] Preferably, in the utility model, the use of the insulating support ensures the electrical isolation between the static side of the vacuum arc-extinguishing chamber and the shell, improves the safety of the equipment, and at the same time, the insulating support also has a certain mechanical strength and can support the weight of the vacuum arc-extinguishing chamber.

[0034] Preferably, in the utility model, the design of the outgoing conductor and the connecting conductor makes the two vacuum arc-extinguishing chambers able to be connected to the circuit respectively, while realizing electrical connection; this design improves the flexibility and reliability of the circuit, and helps to meet the use demand under different working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 A structure schematic view of a double-breaking-point vacuum circuit breaker provided for the utility model embodiment;

[0036] Figure 2The utility model provides a kind of transmission mechanism's structural schematic diagram of double-break vacuum circuit breaker for the utility model embodiment.

[0037] Reference signs:

[0038] 1, operating mechanism;2, shell;3, vacuum interrupter;4, insulating support;5, connecting conductor;6, outgoing conductor;7, insulating pull rod;8, transmission mechanism;9, main shaft;10, coupling;11, driven arm;12, support plate;13, main arm;14, mechanism connecting rod. DETAILED DESCRIPTION

[0039] In order to make the technical problems solved by the utility model, the technical scheme and the beneficial effects clearer and clearer, the following specific embodiments are further described in detail. It should be understood that the specific embodiments described herein are only used to explain the utility model and not to limit the utility model.

[0040] In order to make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be described clearly and completely in the following with reference to the drawings in the utility model embodiment. Obviously, the described embodiments are part of the embodiments of the utility model, not all the embodiments. The components of the utility model embodiments described and shown in the drawings can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the utility model.

[0042] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0043] In the description of the utility model embodiments, it should be explained that if the terms "upper", "lower", "horizontal", "inner" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the utility model product in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0044] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. As "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0045] In the description of the embodiments of the present application, it should be further pointed out that, unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection" and "connection" appear, they should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected. It can be mechanically connected, or it can be electrically connected. It can be directly connected, or it can be indirectly connected through an intermediate medium. It can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] The present application will be described in further detail below with reference to the accompanying drawings:

[0047] Embodiments

[0048] In combination with the background art mentioned, the existing double-break circuit breaker mostly adopts the crank arm and connecting plate transmission mode. This transmission assembly is complex, has more transmission parts, and has large movement inertia, which will result in low transmission efficiency and cause the loss of mechanism operation power. Moreover, too many transmission parts mean the reduction of reliability, which further affects the reliability of the product.

[0049] At the same time, the existing double-break vacuum circuit breaker mostly exists in the medium voltage field, and the vacuum arc-extinguishing chamber mostly adopts a horizontal "I" type arrangement mode. This arrangement mode can be applicable to small opening distance vacuum arc-extinguishing chambers, but is not conducive to the centering of the contacts of large opening distance vacuum arc-extinguishing chambers in the high voltage switch field, and has a large influence on the reliability of the vacuum arc-extinguishing chamber.

[0050] The technical terms involved in the present technical solution will be explained and described below:

[0051] Vacuum arc-extinguishing chamber: that is, vacuum switch tube, which utilizes the excellent insulation of the tube to achieve the function of rapidly extinguishing arc and suppressing current.

[0052] Tank-type vacuum circuit breaker: a GIS circuit breaker with a vacuum arc-extinguishing chamber as the core arc-extinguishing element.

[0053] Gas insulated metal enclosed switchgear (GIS): a switchgear applied in high voltage power systems.

[0054] To address the aforementioned issues, this embodiment provides a double-break vacuum circuit breaker. This double-break vacuum circuit breaker features two vacuum interrupters connected in a U-shape series configuration, resulting in a compact structure and convenient arrangement. The rotating shaft of the vacuum circuit breaker is connected to the main shaft via a coupling, enabling synchronous movement of the two vacuum interrupters.

[0055] like Figure 1 As shown, a double-break vacuum circuit breaker includes a circuit breaker body; the circuit breaker body includes two vertically arranged shells 2, and an insulating support 4 is fixedly connected to the bottom wall of each shell 2; a vacuum interrupter 3 is respectively arranged on the two insulating supports 4; the vacuum interrupter 3 includes a moving side and a stationary side; the stationary sides of the two vacuum interrupters 3 are connected in series by a connecting conductor 5; the moving side of each vacuum interrupter 3 is provided with an outgoing conductor 6; the moving side of the vacuum interrupter 3 is connected to an insulating pull rod 7.

[0056] Two insulating pull rods 7 are respectively connected to the operating mechanism 1 through the same transmission mechanism 8, so that the moving sides of the two vacuum interrupters 3 can be synchronously opened or closed under the action of the operating mechanism 1;

[0057] like Figure 2 As shown, in this embodiment, the transmission mechanism 8 is fixed to the top middle position of the two housings 2 by the support plate 12. The transmission mechanism 8 adopts a left-right symmetrical structure and specifically includes a main shaft 9; a coupling 10 is provided at both ends of the main shaft 9, and a driven crank arm 11 is provided at each coupling 10; a pin is inserted on the driven crank arm 11 and is movably connected to the insulating pull rod 7 through the pin; a main crank arm 13 is fixed in the middle of the main shaft 9; a pin is inserted on the main crank arm 13 and is movably connected to the mechanism link 14 of the operating mechanism 1 through the pin.

[0058] It should be noted that the rotational transmission structure in this embodiment can also adopt rotational transmission methods such as hexagonal shaft transmission or spline transmission.

[0059] In this embodiment, the vacuum interrupter 3 rotates out of the shaft and uses a transmission method of main crank arm 13-main shaft 9-coupling 10-driven crank arm 11 to drive the two vacuum interrupters 3 to move synchronously, so as to realize the synchronous opening or closing of the two circuit breakers.

[0060] Two vacuum interrupters 3 are fixed in two housings by two supporting insulators 4 respectively. The stationary side of the vacuum interrupter 3 is connected by a connecting conductor 5, and the moving side of the vacuum interrupter 3 leads out the current through an outgoing conductor 6. One end of the insulating rod 7 is connected to the moving side of the vacuum interrupter 3, and the other end is connected to the transmission mechanism 8. The operating mechanism 1 drives the transmission mechanism 8 to move, which in turn drives the insulating rod 7 to move up and down, realizing the opening / closing operation of the vacuum interrupter 3.

[0061] Therefore, the double-break vacuum circuit breaker provided by the embodiment is fully symmetrical in the transmission mechanism of the two vacuum arc-extinguishing chambers, and can fully ensure the synchronism of the two breaks; the transmission is realized in a rotating mode, the motion quality (rotational inertia) is small, the transmission efficiency is high, the number of transmission parts is small, the structure is simple, and the reliability is high. In addition, the two vacuum arc-extinguishing chambers are arranged in a U shape, and the specific arrangement direction of the vacuum arc-extinguishing chambers is not limited, the vacuum arc-extinguishing chambers can be arranged vertically, the moving side of the arc-extinguishing chamber can be upward or downward, or the vacuum arc-extinguishing chambers can be arranged horizontally, and the arrangement mode is flexible. The two arc-extinguishing chambers are arranged in two housings, and the product manufacturing and assembly are simple, and the double-break vacuum circuit breaker can be used for research and development of vacuum circuit breakers of various voltage grades.

[0062] The working principle of the double-break vacuum circuit breaker provided by the embodiment is as follows:

[0063] When the circuit breaker operates, the operating mechanism 1 drives the mechanism connecting rod 14 to move, and then drives the main crank arm 13 and the main shaft 9 to rotate, the main shaft 9 drives the driven crank arm 11 to rotate through the shaft coupling 10, the driven crank arm 11 drives the insulating pull rod 7 to displace upward and downward, and then drives the moving side of the vacuum arc-extinguishing chamber 3 to move, so that the two breaks are synchronously opened or closed.

[0064] In summary, the double-break vacuum circuit breaker provided by the embodiment has the following advantages compared with the existing double-break vacuum circuit breaker:

[0065] Firstly, the transmission mechanism of the double-break vacuum circuit breaker only includes a main crank arm, a transmission main shaft and a shaft coupling, the number of parts is small, the loss of mechanism operation work is effectively reduced, the structure is simple and compact, and the reliability is high.

[0066] Secondly, the connecting mechanism of the double-break vacuum circuit breaker is arranged outside the sealed gas chamber, and the late maintenance is convenient, and the risk of foreign matters caused by part friction is effectively avoided.

[0067] Thirdly, the transmission structure of the two vacuum arc-extinguishing chambers of the double-break vacuum circuit breaker is fully symmetrical, that is, the transmission mechanism is fully symmetrical, and the synchronism of the two breaks can be fully ensured.

[0068] Fourthly, the transmission is realized in a rotating mode, the motion quality (rotational inertia) is small, and the transmission efficiency is high.

[0069] Fifthly, the two vacuum arc-extinguishing chambers of the double-break vacuum circuit breaker are arranged in two independent housings, and compared with the two arc-extinguishing chambers arranged in one housing, the product manufacturing and assembly are simple.

[0070] The above embodiment is only one of the implementation manners of the technical scheme of the double-break vacuum circuit breaker, and the scope of protection of the double-break vacuum circuit breaker is not limited to the embodiment, but also includes any changes, substitutions and other implementation manners easily thought of by those skilled in the art within the technical range disclosed by the double-break vacuum circuit breaker.

Claims

1. A double-break vacuum circuit breaker, characterized by, The circuit breaker body comprises two housings (2); each housing (2) is provided with a vacuum interrupter (3) inside; Both of the vacuum interrupters (3) are connected with the same transmission mechanism (8) on the moving side; The transmission mechanism (8) comprises a main crank (13) which is movably connected with the operating mechanism (1); The main crank (13) is provided with a main shaft (9) inside; Both ends of the main shaft (9) are provided with driven cranks (11); Each driven crank (11) is movably connected with the moving side of one vacuum interrupter (3). The transmission mechanism (8) is symmetrically arranged around the main crank (13).

2. The double-break vacuum circuit breaker according to claim 1, characterized in that Both of the driven cranks (11) are connected with the moving side of the vacuum interrupter (3) through an insulating pull rod (7).

3. The double-break vacuum circuit breaker according to claim 1, characterized in that The transmission mechanism (8) is arranged on the top of the circuit breaker body.

4. The double-break vacuum circuit breaker according to claim 1, characterized in that The transmission mechanism (8) is fixed on the top of the two housings (2) through a support plate (12).

5. The double-break vacuum circuit breaker according to claim 4, characterized in that The operating mechanism (1) is movably connected with the main crank (13) through a mechanism connecting rod (14).

6. The double-break vacuum circuit breaker according to claim 1, characterized in that Both ends of the main shaft (9) are connected with the driven cranks (11) through couplings (10).

7. The double-break vacuum circuit breaker according to claim 1, characterized in that The operating mechanism (1) and the main crank (13) and the driven cranks (11) and the moving side of the vacuum interrupter (3) are movably connected through pins.

8. The double-break vacuum circuit breaker according to claim 1, characterized in that The static side of the vacuum interrupter (3) is arranged on the bottom wall of the housing (2) through an insulating support (4).

9. The double-break vacuum circuit breaker according to claim 1, characterized in that, Both of the vacuum interrupters (3) are connected with outgoing conductors (6) on the moving side; the static sides of the two vacuum interrupters (3) are connected in series through a connecting conductor (5).

10. The double-break vacuum circuit breaker according to claim 1, characterized in that ​

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