A vacuum interrupter assembly with built-in isolating break and a vacuum circuit breaker

Abstract

The present invention discloses a vacuum interrupter assembly with a built-in isolating break, including a vacuum interrupter, a built-in isolating break and a linkage device, wherein the vacuum interrupter and the built-in isolating break are respectively connected to the linkage device. The present invention also discloses a vacuum circuit breaker, including an operating mechanism, wherein the closing and opening of the vacuum circuit breaker are completed by operating the operating mechanism, and the vacuum circuit breaker includes a vacuum interrupter assembly with a built-in isolating break, wherein the vacuum interrupter assembly is connected to the operating mechanism. The vacuum interrupter assembly with a built-in isolating break and the vacuum circuit breaker provided by the present invention add a built-in isolating break to the existing pole-mounted vacuum circuit breaker, thereby ensuring the reliability of the circuit breaker opening.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers for power transmission and distribution equipment, and in particular to a vacuum interrupter assembly with a built-in isolating fracture and a vacuum circuit breaker. Background Art

[0002] A circuit breaker is a switching device that can close, carry and disconnect current under normal circuit conditions, and can carry and disconnect current under abnormal circuit conditions (including short-circuit conditions) within a specified time. A pole-mounted circuit breaker is a circuit breaker installed and operated on a utility pole during the construction of a transmission line. It is mainly used for segmented switching, control and protection of transmission and distribution line sections.

[0003] The existing vacuum arc extinguishing, SF6 insulated pole-mounted circuit breakers are key components of power distribution automation. They are used to automatically cut off power supply line faults, upload power supply line status information, and remotely monitor. Their most important function is to disconnect the line.

[0004] However, the distance between the arc extinguishing chamber of the existing pole-mounted vacuum circuit breaker is generally only 8 to 10 mm, which is relatively small. In the open state, when a high overvoltage is generated on the power supply line, the breaking point is likely to be broken down, causing the other side of the switch to be energized again, causing an accident; on the trunk line, this unreliable isolation phenomenon is more obvious and poses a greater threat. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a vacuum interrupter assembly and a vacuum circuit breaker with a built-in isolating fracture, which adds a built-in isolating fracture on the basis of the existing pole-mounted vacuum circuit breaker to ensure the reliability of circuit breaker opening.

[0006] On the one hand, the present invention provides a vacuum interrupter assembly with a built-in isolation fracture, including a vacuum interrupter, wherein an interrupter static contact and an interrupter moving contact are arranged in the vacuum interrupter, and the interrupter static contact and the interrupter moving contact are respectively connected to a conductive rod assembly, and is characterized in that a built-in isolation device is arranged between the interrupter static contact and the conductive rod assembly, or a built-in isolation device is arranged between the interrupter moving contact and the conductive rod assembly.

[0007] Preferably, the above technical solution is that the built-in isolation device is arranged between the moving contact of the arc extinguishing chamber and the conductive rod assembly.

[0008] Preferably, the above technical solution comprises a built-in isolation device including a built-in isolation break and a linkage device, and the built-in isolation break and the vacuum interrupter are respectively connected to the linkage device.

[0009] Preferably, the above technical solution comprises a static contact and an isolation blade capable of opening and closing the connection, the static contact is connected to the conductive rod assembly, and the isolation blade is connected to the linkage device.

[0010] Preferably, the linkage device comprises a guide bracket and an isolation blade holder, the guide bracket is provided with a guide groove, the isolation blade is slidably connected to the guide groove, and the isolation blade is rotatably connected to the isolation blade holder.

[0011] The above technical solution is preferred, wherein the vacuum arc chamber comprises an arc chamber case and the arc chamber moving contact, one end of the arc chamber moving contact passes through and extends out of the arc chamber case, the guide bracket is arranged on the outside of the arc chamber case, and the isolating knife seat is fixedly connected to one end of the arc chamber moving contact.

[0012] Preferably, in the above technical solution, the guide groove is arranged in a shape in which the isolating blade is still engaged with the static contact when the vacuum interrupter is disconnected in place.

[0013] Preferably, the vacuum interrupter assembly further comprises an insulating box, and the vacuum interrupter, the built-in isolating fracture and the linkage device are all arranged in the insulating box.

[0014] Preferably, in the above technical solution, when the switch is in the open position, the distance between the static contact and the isolation blade is greater than or equal to 35 mm.

[0015] On the other hand, the present invention provides a vacuum circuit breaker, including an operating mechanism, by operating the operating mechanism to complete the closing and opening of the vacuum circuit breaker, characterized in that: the vacuum circuit breaker includes the aforementioned vacuum interrupter assembly with a built-in isolation break, and the vacuum interrupter assembly is connected to the operating mechanism.

[0016] The advantages and positive effects of the present invention are:

[0017] (1) A built-in isolation device is added on the basis of the existing vacuum interrupter to control the opening and closing between the vacuum interrupter and the conductive rod assembly. In the open state, when a very high overvoltage is generated on the power supply line, even if the interrupter breaking point is broken down, since the built-in isolation break is in the open state and the break distance of the built-in isolation break is greater than or equal to 35mm, it can ensure that the built-in isolation break is not broken down and the conductive rod assembly on the other side is not energized, thereby ensuring the reliability of the circuit breaker opening;

[0018] (2) Reliable operation. The series linkage process between the built-in isolating break and the arc extinguishing chamber break is ensured by the guide groove of the guide bracket. Since the built-in isolating break has no arc extinguishing structure, its physical structure ensures that no false operation will occur and that the isolating break will not be opened or closed under power.

[0019] (3) The structure is simple. The built-in isolation fracture of the present invention adopts a knife switch structure. The isolation knife seat is directly connected to the moving end of the vacuum interrupter, eliminating the conventional soft connection, with fewer parts, fewer fault points, and reliable operation;

[0020] (4) Good insulation. All parts of the vacuum interrupter assembly of the present invention are integrated and enclosed in an insulating box with a cover on the top, which ensures reliable insulation. When installed in the circuit breaker box, it is no longer necessary to fill it with polluted SF6 gas for insulation reinforcement, which is more environmentally friendly.

[0021] (5) The present invention has good interchangeability and is economical and practical. The present invention can be easily interchanged with existing pole-mounted vacuum circuit breakers without any modification to the operating mechanism, which facilitates the upgrading and transformation of existing old products. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of a vacuum circuit breaker according to an embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of a vacuum interrupter assembly according to an embodiment of the present invention;

[0024] Figure 3 yes Figure 2 The main cross-sectional view of

[0025] Figure 4 yes Figure 2 A top sectional view of

[0026] Figure 5 Schematic diagram of a closed state of a vacuum interrupter assembly according to an embodiment of the present invention;

[0027] Figure 6 1 is a schematic diagram of a state where a vacuum interrupter assembly begins to open according to an embodiment of the present invention;

[0028] Figure 7 1 is a schematic diagram of a vacuum interrupter assembly in an open state according to an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of a vacuum interrupter assembly in an embodiment of the present invention in a state where the opening of the vacuum interrupter assembly is completed;

[0030] Fig. 9 This is a schematic diagram of a vacuum circuit breaker in an open position according to an embodiment of the present invention;

[0031] Fig.10 It is a schematic diagram of a vacuum circuit breaker in a fully closed state according to an embodiment of the present invention.

[0032] Among them: 1. Vacuum arc chamber assembly; 2. Main operating shaft of the mechanism; 3. Insulating pull rod; 4. Opening and closing buffer; 11. Isolating blade; 12. Insulating box cover; 13. Insulating pull rod connecting plate; 14. Axis pin assembly; 141. Rolling bearing; 142. Blade compression spring; 143. Axis pin; 144. Screw; 15. Isolating blade holder; 16. Insulating box; 17. Vacuum arc chamber; 171. Arc chamber static contact; 172. Arc chamber fracture; 173. Arc chamber moving contact; 18. Conductive rod assembly; 19. Guide bracket; 191. Guide groove; 110. Static contact; 111. Built-in isolating fracture. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0037] On the one hand, this embodiment provides a vacuum interrupter assembly with a built-in isolation break, such as Figure 3As shown, it includes a vacuum arc chamber 17, which includes an arc chamber box, an arc chamber static contact 171 and an arc chamber moving contact 173. The right end of the arc chamber static contact passes through and extends out of the right side wall of the arc chamber box, and is connected to the conductive rod assembly 18 at the right end. The left end of the arc chamber moving contact passes through and extends out of the left side wall of the arc chamber box. In the prior art, the left end of the arc chamber moving contact is connected to the conductive rod assembly at the left end. The present application improves this, and a built-in isolation device is provided between the arc chamber static contact and the conductive rod assembly at the right end, or a built-in isolation device is provided between the arc chamber moving contact and the conductive rod assembly at the left end.

[0038] The built-in isolating device is used to open and close the connection between the vacuum arc chamber 17 and the conductive rod assembly 18. A built-in isolating device is added on the basis of the existing vacuum arc chamber to control the opening and closing of the vacuum arc chamber and the conductive rod assembly. In the open state, when a very high overvoltage is generated on the power supply line, even if the breaking fracture of the arc chamber is broken down, since the built-in isolating fracture is in the open state and the fracture distance of the built-in isolating fracture is greater than or equal to 35mm, it can ensure that the built-in isolating fracture is not broken down, and the conductive rod assembly on the other side will not be energized, thereby ensuring the reliability of the circuit breaker opening.

[0039] In order to simplify the operation and mechanical structure, the sequential actions of the external operating mechanism are no longer added to control the opening and closing of the arc chamber break 172 and the opening and closing of the built-in isolation break. In this embodiment, preferably, the built-in isolation device is arranged between the arc chamber moving contact 173 and the conductive rod assembly 18. The built-in isolation device includes a built-in isolation break and a linkage device. The built-in isolation break and the vacuum arc chamber are connected to the linkage device respectively. The setting of the linkage device avoids the improvement of the existing operating mechanism in the vacuum circuit breaker. The operation of the existing operating mechanism can make the arc chamber break 172 and the built-in isolation break 111 open and close successively through the linkage device.

[0040] The built-in isolating fracture 111 adopts a knife switch structure. The built-in isolating fracture includes a static contact 110 and an isolating blade 11 that can be opened and closed. The static contact is connected to the conductive rod assembly 18, and the isolating blade is connected to the linkage device. The linkage device includes a guide bracket 19 and an isolating blade holder 15. The guide bracket is provided with a guide groove 191. The isolating blade is slidably connected to the guide groove, and the isolating blade is rotatably connected to the isolating blade holder. The guide bracket is arranged on the outside of the arc extinguishing chamber box body, and the isolating blade holder is fixedly connected to one end of the moving contact 173 of the arc extinguishing chamber. The isolating blade holder is directly connected to the moving contact end of the vacuum arc extinguishing chamber, eliminating the conventional soft connection, with fewer parts, fewer fault points, and reliable operation.

[0041] The guide groove 191 is set to a shape in which the isolating blade 11 and the static contact 110 are still engaged when the vacuum arc chamber is disconnected. The series linkage process between the built-in isolating fracture and the arc chamber fracture is ensured by the guide groove of the guide bracket. Since the built-in isolating fracture has no arc extinguishing structure, the shape of the guide groove allows the arc chamber fracture 172 to be opened first and then the isolating fracture 111 when opening the circuit, to ensure that the isolating fracture will not be opened with power on; when closing the circuit, the isolating fracture is closed first and then the arc chamber fracture, to ensure that the isolating fracture will not be closed with power on, thus protecting the built-in isolating fracture. When the circuit is opened, the distance between the static contact 110 and the isolating blade 11 is greater than or equal to 35 mm. Figure 2 , 3 As shown, the vacuum interrupter assembly 1 also includes an insulating box 16, in which the vacuum interrupter 17, the built-in isolating break 111 and the linkage device are all arranged. All parts of the vacuum interrupter assembly are integrated and enclosed in an insulating box, and an insulating box cover 12 is added on the top, so that the insulation is reliable. When installed in the circuit breaker box, it is no longer necessary to fill it with polluted SF6 gas for insulation reinforcement, which is more environmentally friendly.

[0042] The specific structure of the vacuum interrupter assembly 1 is as follows: Figure 3 , 4 As shown:

[0043] The conductive rod assembly 18 is respectively arranged at the left and right ends of the insulating box 16, and the vacuum arc chamber 17 is placed on the right side inside the insulating box. The vacuum arc chamber is provided with an arc chamber static contact 171 and an arc chamber moving contact 173. The conductive rod assembly 18 at the right end is connected to the arc chamber static contact. The conductive rod assembly at the left end is connected to the static contact, and the connection form can be a threaded connection, a clamping connection, etc. The guide bracket 19 is arranged on the left side of the vacuum arc chamber, and a mounting hole is provided at the bottom of the guide bracket. The mounting hole is fixedly connected to the insulating box by threads. The right end face of the guide bracket is provided with a support hole, and the support hole is sleeved on the left end of the vacuum arc chamber for fixing the vacuum arc chamber. The arc chamber moving contact 173 passes through the support hole and is fixedly connected to the right end of the isolation knife seat 15, and the connection form is a threaded connection or a clamping connection.

[0044] The left end of the isolation knife seat 15 is rotatably connected to the isolation blade 11 through an axle pin assembly 14, and the axle pin assembly includes an axle pin 143, a rolling bearing 141, a blade compression spring 142 and a screw 144. Specifically, the isolation knife seat and the isolation blade are provided with connecting holes, and the guide bracket is provided with a horizontal slide groove. The axle pin passes through the connecting hole and is slidably connected to the horizontal slide groove. A rolling bearing is provided at the connection between the axle pin and the horizontal slide groove. The setting of the rolling bearing ensures that the axle pin can slide freely in the horizontal slide groove. The blade compression spring is sleeved on the axle pin and is respectively located between the isolation blade and the guide bracket. The blade compression spring applies a force to the isolation blade in the direction of the isolation knife seat to ensure reliable contact between the isolation blade and the isolation knife seat. The screws are installed on the two end faces of the axle pin.

[0045] A guide groove 191 is provided on the guide bracket 19, and the isolation blade is slidably connected to the guide groove through an axle pin assembly 14. The axle pin assembly includes an axle pin 143, a rolling bearing 141, a blade compression spring 142 and a screw 144. Specifically, a through hole is provided on the isolation blade, and the axle pin passes through the through hole. The axle pin is slidably connected to the guide groove. A rolling bearing is provided at the connection between the axle pin and the guide groove. The setting of the rolling bearing ensures that the axle pin can slide freely in the guide groove. The screws are installed on the two end surfaces of the axle pin. The blade compression spring is sleeved on the axle pin and is respectively located between the isolation blade and the guide bracket. The blade compression spring applies a force to the isolation blade in the direction of the static contact to ensure reliable contact between the isolation blade and the static contact.

[0046] The guide groove 191 is composed of two arc grooves connected in sequence. The center of the upper arc groove is the same as the center of the shaft pin located in the horizontal slide groove when the arc extinguishing moving contact 173 is in full opening position, and the center of the lower arc groove is located to the upper left of the center of the upper arc groove. The shape restriction condition of the lower arc groove is: the vertical displacement of the isolation blade 11 sliding in the lower arc groove is less than the vertical displacement of the isolation blade from the blade closing state to the just opening state, and the horizontal displacement of the isolation blade sliding in the lower arc groove is equal to the horizontal displacement of the moving contact 173 from the contact closing state to the contact opening state. This restriction condition is to ensure that the isolation blade 11 is still partially engaged with the static contact 110 when the vacuum interrupter 17 is in full opening position.

[0047] Closing status Figure 5 As shown, in this state, the isolating break 111 is closed, and the vacuum interrupter break 172 is closed. When opening, the isolating blade 11 slides from bottom to top along the arc groove below, and the isolating blade drives the isolating blade seat 15 and the moving contact 173 of the interrupter to move to the left, and the vacuum interrupter starts to open; Figure 6 As shown in FIG, when the isolating blade slides to the junction of the lower arc groove and the upper arc groove, the moving contact of the arc extinguishing chamber is in the open position, but the static contact and the isolating blade are not separated; Figure 7 As shown in the figure, the isolating blade subsequently slides along the upper arc groove. Since the center of the upper arc groove is the same as the center of the shaft pin located in the horizontal slide groove when the arc extinguishing moving contact is in place, that is, the shaft pin in the horizontal slide groove is at the center of the upper arc groove at this time, the isolating blade slides along the upper arc groove, which will not drive the isolating blade holder and the arc extinguishing chamber moving contact to move left and right, and the built-in isolating fracture continues to separate; Figure 8 As shown, the built-in isolating break 111 is also separated in place, the separation distance of the isolating break is greater than 35mm, and the isolating break and the arc extinguishing chamber break are both in place. When opening, the arc extinguishing chamber break is opened first, and then the isolating break is opened, to ensure that the isolating break will not be energized and broken. The closing process is opposite to the opening process. When closing, the isolating break is closed first, and then the arc extinguishing chamber break is closed, to ensure that the isolating break will not be energized and closed. This setting ensures that the built-in isolating break will not be energized and fail during opening and closing.

[0048] On the other hand, the present invention provides a vacuum circuit breaker, including an operating mechanism, by operating the operating mechanism to complete the closing and opening of the vacuum circuit breaker, a mounting hole is provided at the bottom of the insulating box 16, a bolt passes through the mounting hole and is threadedly connected to the vacuum circuit breaker, the aforementioned vacuum interrupter assembly 1 with a built-in isolation fracture is installed in an existing vacuum circuit breaker, such as an existing ZW20-12 type column-mounted vacuum circuit breaker, and the vacuum interrupter assembly is connected to the operating mechanism.

[0049] like Figure 1 As shown, the vacuum arc chamber assembly 1 is connected to the operating mechanism through the main operating shaft 2, the opening and closing buffer 4, the insulating rod 3 and the insulating rod connecting plate 13. The operating mechanism and the main operating shaft, the opening and closing buffer, the insulating rod and the insulating rod connecting plate are all related to the prior art. The present application does not make any improvements to their specific structures and connection relationships, so the relevant specific structures and connection relationships are not repeated here. One end of the insulating rod connecting plate 13 is fixedly connected to the lower end of the insulating rod 3, and the other end of the insulating rod connecting plate 13 is provided with a through hole. The isolation blade 11 is also provided with a through hole. The shaft pin 143 passes through the through hole of the isolation blade and the insulating rod connecting plate to realize the rotation connection between the isolation blade and the insulating rod connecting plate. The specific structure of the shaft pin and the guide groove sliding connection is the aforementioned isolation blade and guide groove connection structure. The upper end of the insulating rod 3 is respectively connected to the opening and closing buffer 4 and the operating mechanism through the main operating shaft 2 of the mechanism. The insulating rod is used for opening and closing operations, and the opening and closing buffer is used to reduce the opening and closing spring vibration. The installation structure is simple.

[0050] The working process of this embodiment is as follows: Fig.10 The figure shows the vacuum circuit breaker in the closed position. Fig.10 The circuit breaker is opened in the state of opening, and the operating mechanism is operated. The operating mechanism drives the insulating pull rod 3 and the insulating pull rod connecting plate 13 to move upward, and the insulating pull rod connecting plate drives the isolating blade 11 to slide upward in the guide groove 191. The isolating blade drives the isolating knife seat 15 and the arc extinguishing chamber moving contact 173 to move left, first opening the arc extinguishing chamber fracture 172, and then opening the isolating fracture 111, to ensure that the isolating fracture will not be disconnected with power on. The circuit breaker is in the state of opening as shown in the figure. Fig. 9 shown; Fig. 9 The circuit breaker is closed in the state of being switched on, and the operating mechanism is operated. The operating mechanism drives the insulating pull rod and the insulating pull rod connecting plate to move downward, and the insulating pull rod connecting plate drives the isolating blade to slide downward in the guide groove. The isolating blade is closed, and the isolating blade will not drive the moving contact of the arc extinguishing chamber to move. The isolating blade slides to the junction of the lower arc groove and the upper arc groove, and the isolating blade contacts the static contact. The isolating blade slides in the lower arc groove, and the isolating blade drives the isolating knife seat and the moving contact of the arc extinguishing chamber to move right. The arc extinguishing chamber is closed, and the isolating fracture is closed first, and then the arc extinguishing chamber fracture is closed to ensure that the isolating fracture will not be disconnected under power.

[0051] The advantages and positive effects of this embodiment are:

[0052] (1) A built-in isolating break is added to the existing pole-mounted vacuum circuit breaker to control the opening and closing between the vacuum interrupter and the conductive rod assembly. In the open state, when a very high overvoltage is generated on the power supply line, even if the isolating break is broken down, since the built-in isolating break is in the open state and the break distance of the built-in isolating break is greater than or equal to 35mm, it can ensure that the built-in isolating break is not broken down and the conductive rod assembly on the other side is not energized, thereby ensuring the reliability of the circuit breaker opening;

[0053] (2) Reliable operation. The series linkage process between the built-in isolating break and the arc extinguishing chamber break is ensured by the guide groove of the guide bracket. Since the built-in isolating break has no arc extinguishing structure, its physical structure ensures that no false operation will occur and that the isolating break will not be opened or closed under power.

[0054] (3) The structure is simple. The built-in isolation fracture of the present invention adopts a knife switch structure. The isolation knife seat is directly connected to the moving end of the vacuum interrupter, eliminating the conventional soft connection, with fewer parts, fewer fault points, and reliable operation;

[0055] (4) Good insulation. All parts of the vacuum interrupter assembly of the present invention are integrated and enclosed in an insulating box with a cover on the top, which ensures reliable insulation. When installed in the circuit breaker box, it is no longer necessary to fill it with polluted SF6 gas for insulation reinforcement, which is more environmentally friendly.

[0056] (5) The present invention has good interchangeability and is economical and practical. The present invention can be easily interchanged with existing pole-mounted vacuum circuit breakers without any modification to the operating mechanism, which facilitates the upgrading and transformation of existing old products.

[0057] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A vacuum interrupter assembly with a built-in isolation fracture, comprising a vacuum interrupter, wherein an interrupter static contact and an interrupter moving contact are arranged in the vacuum interrupter, wherein the interrupter static contact and the interrupter moving contact are respectively connected to a conductive rod assembly, Features: A built-in isolation device is provided between the static contact of the arc extinguishing chamber and the conductive rod assembly, or a built-in isolation device is provided between the moving contact of the arc extinguishing chamber and the conductive rod assembly; the built-in isolation device is provided between the moving contact of the arc extinguishing chamber and the conductive rod assembly; the built-in isolation device includes a built-in isolation break and a linkage device, and the built-in isolation break and the vacuum arc extinguishing chamber are respectively connected to the linkage device; the built-in isolation break includes a static contact and an isolation blade that can be opened and closed, the static contact is connected to the conductive rod assembly, and the isolation blade is connected to the linkage device; the linkage device includes a guide bracket and an isolation blade seat, the guide bracket is provided with a guide groove, the isolation blade is slidably connected to the guide groove, and the isolation blade is rotatably connected to the isolation blade seat; the guide groove is set to a shape in which the isolation blade and the static contact are still engaged when the vacuum arc extinguishing chamber is disconnected in place.

2. The vacuum interrupter assembly with built-in isolation break according to claim 1, Features: The vacuum arc extinguishing chamber comprises an arc extinguishing chamber box body and the arc extinguishing chamber moving contact, one end of the arc extinguishing chamber moving contact passes through and extends out of the arc extinguishing chamber box body, the guide bracket is arranged on the outside of the arc extinguishing chamber box body, and the isolation knife seat is fixedly connected to one end of the arc extinguishing chamber moving contact.

3. The vacuum interrupter assembly with built-in isolation break according to claim 1, Features: The vacuum interrupter assembly also includes an insulating box, in which the vacuum interrupter, the built-in isolating fracture and the linkage device are all arranged.

4. The vacuum interrupter assembly with built-in isolation break according to claim 1, Features: In the open position, the distance between the static contact and the isolation blade is greater than or equal to 35 mm.

5. A vacuum circuit breaker, comprising an operating mechanism, wherein the vacuum circuit breaker is closed and opened by operating the operating mechanism. Features: The vacuum circuit breaker comprises a vacuum interrupter assembly with a built-in isolating break according to any one of claims 1 to 4, and the vacuum interrupter assembly is connected to the operating mechanism.

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