An insulated vacuum circuit breaker with built-in elastic electromagnetic operating mechanism and its breaking method

Abstract

The application relates to the technical field of vacuum circuit breakers, in particular to an insulation vacuum circuit breaker with a built-in elastic electromagnetic operating mechanism and a circuit breaking method thereof. The insulation vacuum circuit breaker comprises a circuit breaker main body, a vacuum arc-extinguishing chamber arranged on the circuit breaker main body, a fixed contact fixed in the vacuum arc-extinguishing chamber, a movable contact movably connected in the vacuum arc-extinguishing chamber and a piston arranged in the vacuum arc-extinguishing chamber from top to bottom. A first spring is fixedly connected between the movable contact and the piston. First and second fixed rods are arranged on the circuit breaker main body. First and second swing arms are hingedly connected to the first fixed rod. Push rods are arranged on the first and second swing arms. A second spring is arranged between the push rods and the second fixed rod. The application utilizes electromagnetic real-time driving spring stretching energy storage and release, so that the movable contact and the fixed contact are rapidly separated to cut off the circuit. The advantages of fast response and mechanical retention are considered. In addition, the current can be rapidly cut off, and the circuit breaking effect is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vacuum circuit breakers, in particular to an insulation vacuum circuit breaker with an embedded elastic electromagnetic operating mechanism and a circuit breaking method thereof. BACKGROUND

[0002] In the power system, the circuit breaker as a key power control and protection device, its performance directly affects the safety, reliability and service life of the power grid. In recent years, with the development of smart grid, new energy access and high voltage level power transmission and distribution network, higher requirements are put forward for the circuit breaker, including miniaturization, high reliability, long service life, maintenance free and environmental adaptability, etc.

[0003] At present, the mainstream high voltage / medium voltage circuit breaker in the market mainly includes two categories of vacuum circuit breaker and SF6 gas circuit breaker. Among them, the vacuum circuit breaker occupies a dominant position in the medium voltage field with its advantages of no pollution, strong arc extinguishing ability, compact structure, etc. However, the traditional vacuum circuit breaker still has the following technical difficulties:

[0004] (1) Limitation of insulation shell material: Most vacuum arc extinguishing chambers use ceramic or glass fiber resin materials. Although ceramic has excellent insulation performance, it is high in brittleness, poor in impact resistance, and its air tightness depends on metal flange welding, which has the risk of gas leakage. Resin type has the problems of easy aging and insulation performance decline after long-term operation;

[0005] (2) Although the existing spring operating mechanism or permanent magnet mechanism can realize the function of circuit breaker opening and closing, it has complex structure, many parts, limited mechanical life, and high energy consumption of spring pre-stored energy with motor cooperation, and has problems of response delay, etc. Although some electromagnetic operating mechanisms have rapid response, they have high energy consumption and large impact, which easily leads to fatigue damage of insulation structure.

[0006] In addition, the high voltage circuit breaker is easy to encounter condensation, pollution and temperature change in outdoor long-term operation. The traditional sealing structure is easy to appear micro leakage under the conditions of thermal expansion and cold contraction or vibration, which leads to the decrease of vacuum degree inside the arc extinguishing chamber and causes insulation breakdown or breaking failure. Therefore, we provide an insulation vacuum circuit breaker with an embedded elastic electromagnetic operating mechanism and a circuit breaking method to solve the above-mentioned problems. SUMMARY

[0007] The purpose of the present application is to provide an insulation vacuum circuit breaker with an embedded elastic electromagnetic operating mechanism and a circuit breaking method, which combines the advantages of rapid response and mechanical retention by designing a composite operating mechanism of electromagnetic drive and spring energy storage to solve the problems raised in the background technology.

[0008] To achieve the above purpose, the present application provides the following technical scheme:

[0009] The utility model provides an insulating vacuum circuit breaker with built-in elastic electromagnetic operating mechanism, comprising a circuit breaker body provided with a vacuum arc extinguishing chamber, characterized in that the vacuum arc extinguishing chamber is internally provided with a fixed contact fixed in the vacuum arc extinguishing chamber, a movable contact movably connected in the vacuum arc extinguishing chamber and a piston from top to bottom, wherein a first spring is fixedly connected between the movable contact and the piston, the circuit breaker body is provided with a first fixed rod and a second fixed rod, the first fixed rod is hingedly connected with a first swing arm and a second swing arm, the first swing arm and the second swing arm are provided with a push rod, a second spring is arranged between the push rod and the second fixed rod, the second spring is sleeved on the second fixed rod and the push rod at both ends, a piston rod is movably connected in the vacuum arc extinguishing chamber, one end of the piston rod is fixed with the piston, a connecting rod is arranged between the piston rod and the second swing arm, one end of the connecting rod is hingedly connected with the piston rod, and the other end is slidably connected with the second swing arm through a clamping assembly, and the circuit breaker body is provided with an electromagnetic drive mechanism for driving the push rod to swing.

[0010] The utility model provides an insulating vacuum circuit breaker with built-in elastic electromagnetic operating mechanism, wherein the vacuum arc extinguishing chamber is made of smooth material and ceramic composite material.

[0011] The utility model provides an insulating vacuum circuit breaker with built-in elastic electromagnetic operating mechanism, wherein the piston is made of insulating rubber, and the first spring is made of insulating ceramic spring.

[0012] The utility model provides an insulating vacuum circuit breaker with built-in elastic electromagnetic operating mechanism, wherein the clamping assembly comprises a clamping groove formed in the second swing arm and a clamping pin fixed on the connecting rod, and the clamping pin is movably connected in the clamping groove.

[0013] The utility model provides an insulating vacuum circuit breaker with built-in elastic electromagnetic operating mechanism, wherein when the push rod rotates to the bottommost position, the push rod, the first fixed rod and the second fixed rod are on the same vertical line, and the second spring is in a vertical state and reaches the maximum stretching amount.

[0014] The utility model provides an insulating vacuum circuit breaker with built-in elastic electromagnetic operating mechanism, wherein the circuit breaker body is further provided with a closing mechanism for driving the movable contact to reset, the closing mechanism comprises a third fixed rod fixed on the circuit breaker body, a rotating arm hingedly connected on the third fixed rod, an extrusion ring arranged at one end of the rotating arm, a limiting frame arranged on the circuit breaker body, a contactor movably connected in the limiting frame, a rectangular frame arranged at one end of the contactor, and an insertion rod movably connected in the rectangular frame at the other end of the rotating arm.

[0015] The insulating vacuum circuit breaker with built-in elastic electromagnetic operating mechanism as described above: the first swing arm is in the same plane as the extrusion ring, that is, when the first swing arm is deflected, it will extrude the extrusion ring to drive the extrusion ring to rotate.

[0016] The insulating vacuum circuit breaker with built-in elastic electromagnetic operating mechanism as described above: the electromagnetic drive mechanism includes an electromagnetic driver fixed on the circuit breaker body, and a push plate is installed at the output end of the electromagnetic driver for pushing the push rod to move.

[0017] A circuit breaking method of the insulating vacuum circuit breaker with built-in elastic electromagnetic operating mechanism, comprising the following steps,

[0018] S1, in the initial state, the movable contact is in contact with the fixed contact, and the circuit current is in a connected state; when it is necessary to cut off the circuit current, the electromagnetic driver is started to drive the push plate to extend and push the push rod to deflect;

[0019] S2, when the push rod is deflected, the second swing arm and the second fixed rod are synchronously deflected, the second swing arm is deflected to drive the connecting rod to swing, the connecting rod swings to drive the piston rod to move downward, that is, to pull the piston to move downward, and in the process of moving downward, the first spring is gradually stretched from the compressed state, and when the push rod rotates to the bottom, the first swing arm and the second spring are in a vertical state, and the second spring reaches the maximum stretching amount; at this time, the second swing arm is also in a vertical state, and it is noted that the piston has moved a distance downward at this time, and at this time, the first spring is just stretched from the compressed state to the natural state, and the movable contact and the fixed contact are at a critical point of separation;

[0020] S3, when the push plate continues to move to drive the push rod to continue to deflect, the first swing arm and the second swing arm continue to deflect, the second spring is quickly contracted from the stretched state, driving the first swing arm and the second swing arm to quickly deflect to the other side, at this time, the second swing arm drives the connecting rod to quickly deflect, the connecting rod drives the piston rod to quickly move downward, and when the piston rod moves downward, it drives the piston to quickly move downward, and when the piston moves downward, it stretches the first spring to make the movable contact connected with the first spring quickly separate from the fixed contact, so as to cut off the circuit current.

[0021] Compared with the prior art, the beneficial effects of the present application are: when in use, in the initial state, the movable contact is in contact with the fixed contact, and the circuit current is in a connected state; when it is necessary to cut off the circuit current, the electromagnetic driver is started to drive the push plate to extend and push the push rod to deflect; when the push rod deflects, the second swing arm and the second fixed rod are synchronously deflected, the second swing arm deflects to swing the connecting rod, the connecting rod swings to move the piston rod downward, i.e., to pull the piston downward, the piston moves downward in the process to gradually stretch the first spring from the compressed state, and when the push rod rotates to the bottom, i.e., the first swing arm and the second spring are in a vertical state and the stretching amount of the second spring reaches the maximum value, at this time, the second swing arm is also in a vertical state, and it is noted that the piston has moved downward by a distance in this state, at this time, the first spring is just stretched from the compressed state to the natural state, and the movable contact and the fixed contact are at a critical point of separation; when the push plate continues to move to continue deflecting the push rod, the first swing arm and the second swing arm continue to deflect, the second spring is quickly contracted from the stretched state, and the first swing arm and the second swing arm are quickly deflected to the other side, at this time, the second swing arm quickly deflects the connecting rod, the connecting rod quickly moves the piston rod downward, and the piston rod moves downward to quickly move the piston downward, and the piston stretches the first spring when moving downward to quickly separate the movable contact connected with the first spring from the fixed contact, so that the circuit current is cut off, and the opening operation is completed.

[0022] Therefore, the present application uses an electromagnetic drive and spring energy storage composite operating mechanism to drive the spring to stretch and store energy in real time, and the movable contact and the fixed contact are quickly separated to cut off the circuit by releasing the energy, which has the advantages of quick response and mechanical retention, and does not need to pre-compress the closing spring to store energy by a motor when completing the opening operation, solves the problems of high energy consumption, delayed response, high energy consumption and large impact of electromagnetic direct drive, and fatigue damage of the insulation structure, and forms a larger vacuum space between the movable contact and the fixed contact by first moving the piston downward, so that there are fewer neutral particles in the unit vacuum space, the arc loses the medium at the moment when the movable contact and the fixed contact are separated, the current is quickly cut off, and the circuit breaking effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a first perspective view of the overall structure of an insulation vacuum circuit breaker with an embedded elastic electromagnetic operating mechanism.

[0024] Figure 2 It is a second perspective view of the overall structure of an insulation vacuum circuit breaker with an embedded elastic electromagnetic operating mechanism.

[0025] Figure 3 It is a partial structure diagram of an insulation vacuum circuit breaker with an embedded elastic electromagnetic operating mechanism. Figure 1 ​

[0026] Figure 4 Another perspective structural diagram of the insulation vacuum circuit breaker with the built-in elastic electromagnetic operating mechanism Figure 3 Another perspective structural diagram of the insulation vacuum circuit breaker with the built-in elastic electromagnetic operating mechanism

[0027] Figure 5 Another perspective structural diagram of the insulation vacuum circuit breaker with the built-in elastic electromagnetic operating mechanism Figure 1 Part exploded structural diagram of the insulation vacuum circuit breaker with the built-in elastic electromagnetic operating mechanism

[0028] Figure 6 Another perspective structural diagram of the insulation vacuum circuit breaker with the built-in elastic electromagnetic operating mechanism Figure 5 Another perspective structural diagram of the insulation vacuum circuit breaker with the built-in elastic electromagnetic operating mechanism

[0029] Figure 7 Another perspective structural diagram of the insulation vacuum circuit breaker with the built-in elastic electromagnetic operating mechanism Figure 6 Another perspective structural diagram of the insulation vacuum circuit breaker with the built-in elastic electromagnetic operating mechanism

[0030] Figure 8 Part exploded structural diagram of the insulation vacuum circuit breaker with the built-in elastic electromagnetic operating mechanism Figure 7 Part exploded structural diagram of the insulation vacuum circuit breaker with the built-in elastic electromagnetic operating mechanism

[0031] Figure 9 Another perspective structural diagram of the insulation vacuum circuit breaker with the built-in elastic electromagnetic operating mechanism Figure 8 Another perspective structural diagram of the insulation vacuum circuit breaker with the built-in elastic electromagnetic operating mechanism

[0032] Figure 10 Another perspective structural diagram of the insulation vacuum circuit breaker with the built-in elastic electromagnetic operating mechanism Figure 8 Another perspective structural diagram of the insulation vacuum circuit breaker with the built-in elastic electromagnetic operating mechanism

[0033] In the figure: 1, circuit breaker main body; 2, vacuum arc-extinguishing chamber; 3, fixed contact; 4, piston rod; 5, piston; 6, first spring; 7, movable contact; 8, connecting rod; 9, first fixed rod; 10, first swing arm; 11, second swing arm; 12, second fixed rod; 13, push rod; 14, clamping groove; 15, clamping pin; 16, second spring; 18, third fixed rod; 19, rotating arm; 20, extrusion ring; 21, shutter; 22, rectangular frame; 24, insertion rod; 25, limiting frame; 26, electromagnetic driver; 27, push plate. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0035] Please refer to Figures 1-10As an embodiment of the present application, an insulated vacuum circuit breaker with built-in elastic electromagnetic operating mechanism comprises a circuit breaker body 1, a vacuum arc-extinguishing chamber 2 arranged on the circuit breaker body 1, a fixed contact 3 fixed in the vacuum arc-extinguishing chamber 2, a movable contact 7 movably connected in the vacuum arc-extinguishing chamber 2, and a piston 5, wherein a first spring 6 is fixedly connected between the movable contact 7 and the piston 5, a first fixed rod 9 and a second fixed rod 12 are arranged on the circuit breaker body 1, a first swing arm 10 and a second swing arm 11 are hingedly connected to the first fixed rod 9, a push rod 13 is arranged on the first swing arm 10 and the second swing arm 11, a second spring 16 is arranged between the push rod 13 and the second fixed rod 12, the second spring 16 is sleeved on the second fixed rod 12 and the push rod 13 at two ends, a piston rod 4 is movably connected in the vacuum arc-extinguishing chamber 2, one end of the piston rod 4 is fixed to the piston 5, a connecting rod 8 is arranged between the piston rod 4 and the second swing arm 11, one end of the connecting rod 8 is hingedly connected to the piston rod 4, and the other end of the connecting rod 8 is slidably connected to the second swing arm 11 through a clamping assembly, and an electromagnetic driving mechanism is arranged on the circuit breaker body 1 to drive the push rod 13 to swing.

[0036] In this embodiment, in use, in the initial state, the movable contact 7 is in contact with the fixed contact 3, and the circuit current is in a connected state, when it is needed to cut off the circuit current, the push rod 13 is pushed to swing by the electromagnetic driving mechanism; when the push rod 13 swings, the second swing arm 11 and the second fixed rod 12 swing synchronously, when the second swing arm 11 swings, the connecting rod 8 swings, the connecting rod 8 drives the piston rod 4 to move downward, i.e., the piston 5 is pulled to move downward, the first spring 6 is gradually stretched from the compressed state in the process that the piston 5 moves downward, when the push rod 13 rotates to the bottom, i.e., the first swing arm 10 and the second spring 16 are in a vertical state and the stretching amount of the second spring 16 reaches the maximum value, at this time, the second swing arm 11 is also in a vertical state, it is noted that the piston 5 moves downward by a distance in this state, at this time, the first spring 6 is just stretched from the compressed state to the natural state, the movable contact 7 and the fixed contact 3 are at a critical point of separation, when the electromagnetic driving mechanism drives the push rod 13 to continue to swing, the first swing arm 10 and the second swing arm 11 continue to swing to one side from the vertical state, the second spring 16 is quickly contracted from the stretched state, the first swing arm 10 and the second swing arm 11 are quickly swung to the other side, at this time, the second swing arm 11 quickly swings the connecting rod 8, the connecting rod 8 quickly drives the piston rod 4 to move downward, the piston rod 4 quickly drives the piston 5 to move downward when the piston rod 4 moves downward, the piston 5 stretches the first spring 6 when the piston 5 moves downward, so that the movable contact 7 connected with the first spring 6 quickly separates from the fixed contact 3, the circuit current is cut off, and the opening operation is completed.

[0037] As a further scheme of the present application, the vacuum arc-extinguishing chamber 2 is made of a smooth material, and is made of a ceramic composite material.

[0038] In this embodiment, the ceramic composite material is used to replace the original alumina ceramic or common glass, and has the sealing performance and the mechanical stability of the ceramic, thereby constituting the insulating shell of the vacuum interrupter 2.

[0039] As a further scheme of the present application, the piston 5 is an insulating rubber piston, and the first spring 6 is an insulating ceramic spring.

[0040] In this embodiment, the piston 5 and the first spring 6 are made of insulating materials, so that an insulating environment is formed between the movable contact 7 and the fixed contact 3, and the piston 5 can seal the vacuum environment inside the vacuum interrupter 2, thereby reducing the entry of external dust and impurities into the vacuum interrupter 2.

[0041] As a further scheme of the present application, the clamping assembly includes a clamping groove 14 formed in the second swing arm 11 and a clamping pin 15 fixed to the connecting rod 8, and the clamping pin 15 is movably clamped in the clamping groove 14.

[0042] In this embodiment, when the second swing arm 11 is deflected, the connecting rod 8 is deflected by the clamping pin 15 movably clamped in the clamping groove 14.

[0043] As a further scheme of the present application, when the push rod 13 is rotated to the bottommost position, the push rod 13, the first fixed rod 9, and the second fixed rod 12 are on the same vertical line, and the second spring 16 is in a vertical state with the maximum stretching amount.

[0044] In this embodiment, when the push rod 13 is rotated to the bottommost position, the push rod 13, the first fixed rod 9, and the second fixed rod 12 are on the same vertical line, and the second spring 16 is in a vertical state with the maximum stretching amount, that is, when the push rod 13 continues to deflect to one side on the same vertical line of the push rod 13, the first fixed rod 9, and the second fixed rod 12, the second spring 16 will quickly contract to drive the push rod 13 to rapidly deflect to one side.

[0045] As a further scheme of the present application, the circuit breaker body 1 is further provided with a closing mechanism for driving the movable contact 7 to reset, and the closing mechanism includes a third fixed rod 18 fixed to the circuit breaker body 1, a rotating arm 19 hinged to the third fixed rod 18, an extrusion ring 20 provided at one end of the rotating arm 19, a limiting frame 25 provided on the circuit breaker body 1, a contact 21 movably clamped in the limiting frame 25, a rectangular frame 22 provided at one end of the contact 21, and a plug rod 24 movably clamped in the rectangular frame 22 at the other end of the rotating arm 19.

[0046] In this embodiment, when the push rod 13 is deflected to drive the movable contact 7 to move downward and disengage from the fixed contact 3 to perform the opening operation, the first swing arm 10 is deflected synchronously, that is, when the first swing arm 10 is deflected, the extrusion ring 20 is extruded to drive the rotating arm 19 to be deflected, the rotating arm 19 is deflected to drive the shutter 21 to move outward of the circuit breaker body 1 to extend, so that after the opening operation is completed, when the closing operation is needed, the electromagnetic drive mechanism is reset, and the shutter 21 is manually pushed to drive the rotating arm 19 to be deflected in the opposite direction, the extrusion ring 20 is extruded to drive the first swing arm 10 to be deflected in the opposite direction, so as to drive the second swing arm 11 to be deflected in the opposite direction, and then drive the connecting rod 8 to swing, drive the piston rod 4 to move upward, and finally drive the piston 5, the first spring 6 and the movable contact 7 to move upward, so that the movable contact 7 and the fixed contact 3 are re-contacted to make the circuit re-connected, and the closing operation is manually completed.

[0047] As a further scheme of the present application, the first swing arm 10 and the extrusion ring 20 are in the same plane, that is, when the first swing arm 10 is deflected, the extrusion ring 20 is extruded to drive the extrusion ring 20 to rotate.

[0048] In this embodiment, the first swing arm 10 and the extrusion ring 20 are in the same plane, the first swing arm 10 is deflected to extrude the extrusion ring 20 to drive the extrusion ring 20 to rotate, and the extrusion ring 20 is deflected to extrude the first swing arm 10 to drive the first swing arm 10 to rotate.

[0049] As a further scheme of the present application, the electromagnetic drive mechanism includes an electromagnetic driver 26 fixed on the circuit breaker body 1, and a push plate 27 for pushing the push rod 13 to move is installed at an output end of the electromagnetic driver 26.

[0050] In this embodiment, the electromagnetic driver 26 is electrically connected with an external power supply through a wire, and the electromagnetic driver 26 is started to drive the push plate 27 to move, thereby pushing the push rod 13 to move.

[0051] In the initial state, the movable contact 7 and the fixed contact 3 are connected with the external load through the wires, and the movable contact 7 and the fixed contact 3 are in contact, so that the circuit current between the movable contact 7 and the fixed contact 3 is in a connected state. When it is needed to cut off the circuit current between the movable contact 7 and the fixed contact 3, the electromagnetic driver 26 is started to drive the push plate 27 to extend and retract to push the push rod 13 to deflect; when the push rod 13 deflects, the second swing arm 11 and the second fixed rod 12 are synchronously deflected, the second swing arm 11 is deflected to swing the connecting rod 8, the connecting rod 8 swings to move the piston rod 4 downward, i.e. to pull the piston 5 to move downward, the first spring 6 is gradually stretched from the compressed state in the process of the downward movement of the piston 5, and when the push rod 13 rotates to the bottom, i.e. the first swing arm 10 and the second spring 16 are in the vertical state and the stretching amount of the second spring 16 reaches the maximum value, at this time, the second swing arm 11 is also in the vertical state, and it is noted that the piston 5 moves a distance downward in this state, at this time, the first spring 6 is just stretched from the compressed state to the natural state, i.e. the first spring 6 no longer exerts the elastic force on the movable contact 7, and the movable contact 7 and the fixed contact 3 are at the critical point of separation; when the push plate 27 continues to move to drive the push rod 13 to continue to deflect, the first swing arm 10 and the second swing arm 11 continue to deflect, the second spring 16 is quickly contracted from the stretched state, and the first swing arm 10 and the second swing arm 11 are quickly deflected to the other side, at this time, the second swing arm 11 quickly deflects the connecting rod 8, the connecting rod 8 quickly moves the piston rod 4 downward, and the piston rod 4 quickly moves the piston 5 downward, so that the first spring 6 is stretched to quickly separate the movable contact 7 connected with the first spring 6 from the fixed contact 3, and the circuit current is cut off.

[0052] The above embodiments are exemplary but not restrictive, and the technical solutions of the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application, which are all included in the present application.

Claims

1. An insulated vacuum circuit breaker with a built-in flexible electromagnetic operating mechanism, comprising a circuit breaker body (1), wherein a vacuum interrupter (2) is provided on the circuit breaker body (1), characterized in that, The vacuum interrupter (2) is provided with, from top to bottom, a fixed contact (3) fixed inside the vacuum interrupter (2), a movable contact (7) movably engaged inside the vacuum interrupter (2), and a piston (5). A first spring (6) is fixedly connected between the movable contact (7) and the piston (5). The circuit breaker body (1) is provided with a first fixed rod (9) and a second fixed rod (12). A first swing arm (10) and a second swing arm (11) are hinged to the first fixed rod (9). A push rod (13) is provided on the first swing arm (10) and the second swing arm (11). 13) A second spring (16) is provided between the second fixed rod (12) and the second fixed rod (13). The two ends of the second spring (16) are respectively sleeved on the second fixed rod (12) and the push rod (13). A piston rod (4) is movably inserted inside the vacuum interrupter (2). One end of the piston rod (4) is fixed to the piston (5). A connecting rod (8) is provided between the piston rod (4) and the second swing arm (11). One end of the connecting rod (8) is hinged to the piston rod (4), and the other end is slidably engaged with the second swing arm (11) through a snap-fit ​​assembly. An electromagnetic drive mechanism for driving the push rod (13) to swing is provided on the circuit breaker body (1). The circuit breaker body (1) is also provided with a closing mechanism for resetting the movable contact (7). The closing mechanism includes a third fixed rod (18) fixed on the circuit breaker body (1). A rotating arm (19) is hinged on the third fixed rod (18). A compression ring (20) is provided at one end of the rotating arm (19). A limit frame (25) is provided on the circuit breaker body (1). A knife switch (21) is movably engaged in the limit frame (25). A rectangular frame (22) is provided at one end of the knife switch (21). A plug rod (24) is movably engaged in the rectangular frame (22) at the other end of the rotating arm (19). The first swing arm (10) and the extrusion ring (20) are on the same plane. That is, when the first swing arm (10) deflects, it will squeeze the extrusion ring (20) and drive the extrusion ring (20) to rotate.

2. An insulated vacuum circuit breaker with a built-in elastic electromagnetic operating mechanism according to claim 1, characterized in that, The vacuum interrupter (2) is made of a smooth material and is constructed from ceramic composite materials.

3. An insulated vacuum circuit breaker with a built-in elastic electromagnetic operating mechanism according to claim 1, characterized in that, The piston (5) is an insulated rubber piston, and the first spring (6) is an insulated ceramic spring.

4. An insulated vacuum circuit breaker with a built-in elastic electromagnetic operating mechanism according to claim 1, characterized in that, The snap-fit ​​assembly includes a slot (14) formed on the second swing arm (11) and a pin (15) fixed on the connecting rod (8), wherein the pin (15) is movably snapped into the slot (14).

5. An insulated vacuum circuit breaker with a built-in elastic electromagnetic operating mechanism according to claim 1, characterized in that, When the push rod (13) rotates to the bottom, the push rod (13), the first fixed rod (9), and the second fixed rod (12) are on the same vertical line, and the second spring (16) is in a vertical state and the stretching reaches its maximum value.

6. An insulated vacuum circuit breaker with a built-in elastic electromagnetic operating mechanism according to claim 1, characterized in that, The electromagnetic drive mechanism includes an electromagnetic driver (26) fixed on the circuit breaker body (1), and the output end of the electromagnetic driver (26) is equipped with a push plate (27) for pushing the push rod (13) to move.

7. A circuit breaking method for an insulated vacuum circuit breaker with a built-in elastic electromagnetic operating mechanism as described in any one of claims 1-6, characterized in that, Includes the following steps, S1, In the initial state, the movable contact (7) is in contact with the fixed contact (3), and the circuit current is in a connected state. When it is necessary to cut off the circuit current, the electromagnetic driver (26) is activated to drive the push plate (27) to extend and push the push rod (13) to deflect. S2, when the push rod (13) deflects, it drives the second swing arm (11) and the second fixed rod (12) to deflect synchronously. When the second swing arm (11) deflects, it drives the connecting rod (8) to swing. The swing of the connecting rod (8) drives the piston rod (4) to move down, that is, pulls the piston (5) to move down. During the downward movement of the piston (5), the first spring (6) gradually extends from the compressed state. When the push rod (13) rotates to the bottom, the first swing arm (10) and the second spring (16) are in the vertical state and the extension of the second spring (16) reaches the maximum value. At this time, the second swing arm (11) is also in the vertical state. Note that in this state, the piston (5) moves down a certain distance. At this time, the first spring (6) just extends from the compressed state to the natural state. The movable contact (7) and the fixed contact (3) are at the critical point of separation. S3, when the push plate (27) continues to move and drives the push rod (13) to continue to deflect, the first swing arm (10) and the second swing arm (11) continue to deflect. The second spring (16) quickly contracts from the stretched state, driving the first swing arm (10) and the second swing arm (11) to quickly deflect to the other side. At this time, the second swing arm (11) drives the connecting rod (8) to deflect quickly. The connecting rod (8) drives the piston rod (4) to move downward quickly. When the piston rod (4) moves downward, it drives the piston (5) to move downward quickly. When the piston (5) moves downward, it stretches the first spring (6), thereby causing the movable contact (7) connected to the first spring (6) to quickly separate from the fixed contact (3), thus disconnecting the circuit current.

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