Vacuum molded case circuit breaker

Abstract

A vacuum molded case circuit breaker comprises a shell, an operating mechanism and a phase pole unit, the operating mechanism and the phase pole unit are respectively arranged in the shell, the phase pole unit comprises a vacuum arc-extinguishing chamber, a pushing mechanism and a rotating shaft mechanism, and the vacuum arc-extinguishing chamber comprises a vacuum tube, a movable guide rod and a static guide rod. The pushing mechanism comprises a guide seat, a guide structure and a guide rod, the guide seat is provided with a guide hole, the axis direction of the guide hole is parallel to the moving direction of the movable guide rod, the guide structure is in sliding fit with the guide hole, and the guide rod is arranged in the guide hole. The rotating shaft mechanism is connected with the operating mechanism, one end of the guide rod is connected with the rotating shaft mechanism, the other end of the guide rod is connected with the movable guide rod through the guide structure, when the operating mechanism drives the rotating shaft mechanism to rotate, the guide rod is driven to rotate, and rotating motion is converted into linear motion in the axis direction of a guide hole through the guide structure. And the moving guide rod is driven to drive the moving contact to be contacted with or separated from the static contact.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, specifically to a vacuum molded case circuit breaker. Background Technology

[0002] Existing molded case circuit breakers typically employ a grid-type arc-extinguishing system. This system introduces the electric arc into the extinguishing grid through arc ignition, and then multiple layers of grids break the long arc into multiple short arc segments, which are then cooled and extinguished, ultimately completing arc extinction. However, this grid-type arc-extinguishing system is an open structure, allowing the arc to diffuse in the atmosphere. Especially under high-voltage (2000V or higher) short-circuit conditions, rapid arc extinguishing is difficult, and even with devices to reduce flashover, absolute zero flashover cannot be achieved. While vacuum interrupters extinguish arcs in a vacuum environment, achieving near-zero flashover, they require complex sealing systems to maintain sufficient vacuum. Therefore, vacuum interrupters are often too large and expensive, making them practically unsuitable for existing molded case circuit breakers. Utility Model Content

[0003] The purpose of this invention is to overcome at least one defect of the prior art and provide a vacuum molded case circuit breaker.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A vacuum molded case circuit breaker includes a housing and an operating mechanism and a phase unit respectively disposed in the housing. The phase unit includes a vacuum interrupter, a pushing mechanism, and a rotating shaft mechanism. The vacuum interrupter includes a vacuum tube, a moving guide rod, and a stationary guide rod. Moving contacts and stationary contacts are respectively disposed at one end of the moving guide rod and the stationary guide rod located within the vacuum tube.

[0006] The pushing mechanism includes a guide seat, a guide structure, and a guide rod. The guide seat has a guide hole whose axial direction is parallel to the movement direction of the moving guide rod. The guide structure is slidably fitted with the guide hole. The rotating shaft mechanism is connected to the operating mechanism. One end of the guide rod is connected to the rotating shaft mechanism, and the other end is connected to the moving guide rod through the guide structure.

[0007] When the operating mechanism drives the rotating shaft mechanism to rotate, it drives the guide rod to rotate. The rotational motion is converted into linear motion along the axis of the guide hole through the guide structure, so as to drive the moving guide rod to contact and separate the moving contact from the stationary contact.

[0008] Preferably, the inner wall of the guide hole is provided with a protruding guide rib, the length direction of the guide rib is parallel to the moving direction of the moving guide rod, and the guide structure is provided with a guide groove that slides on the guide rib to prevent the guide structure from rotating around the axis.

[0009] Preferably, the guide structure includes a guide portion extending from the end of the moving guide rod away from the moving contact, the guide portion being slidably engaged with a guide hole; and / or, the guide structure includes a guide post coaxially disposed with the moving guide rod, the guide post being connected between the moving guide rod and the guide rod, the guide post being slidably engaged with a guide hole.

[0010] Preferably, the pushing mechanism further includes a push plate connected to the guide structure, the push plate being electrically connected to the moving guide rod, and the push plate being electrically connected to the moving wire structure via a flexible conductor, and the push plate being connected to the rotating shaft mechanism via the guide rod.

[0011] Preferably, the pushing mechanism includes a locking plate connected to the push plate, a first conductive part of the moving wire structure is opposite to the push plate and spaced apart and electrically connected by a flexible conductor, the first conductive part is located between the moving guide rod and the push plate, and a connecting member passes through the first conductive part and the guide structure to electrically connect the push plate and the moving guide rod;

[0012] The vacuum molded case circuit breaker also includes a locking mechanism. When the electric repulsive force drives the push plate to move, causing the moving contact to quickly separate from the stationary contact, and the locking plate moves to the locking position, the locking mechanism locks the locking plate, keeping the moving contact and the stationary contact in a separated state.

[0013] Preferably, the locking mechanism includes a locking member and a locking spring. The locking plate is provided with a locking hole that cooperates with the locking member. When the electric repulsive force causes the push plate to move the locking plate to the locking position, the locking hole on the locking plate is hooked by the locking member. The locking spring is used to drive the locking member to hook the locking hole and maintain the lock.

[0014] Preferably, it also includes an interlocking mechanism for locking the moving contact in a state where it cannot contact the stationary contact.

[0015] The operating handle is connected to the operating mechanism. The operating handle can move between the open position and the closed position. The operating mechanism includes an energy storage spring and has a dead point position between the open position and the closed position. When the operating handle moves from one of the open position and the closed position to the dead point position, it can drive the energy storage spring to rotate, so that the energy storage spring first stores energy and releases energy after passing the dead point position. The component force of the energy storage spring applied to the operating handle in the direction of movement changes from resistance to thrust after passing the dead point position. The energy storage spring drives the operating handle to move to the other of the open position and the closed position. When the operating handle moves to the open position, it drives the moving contact to separate from the stationary contact. When the operating handle moves to the closed position, it drives the moving contact to contact the stationary contact.

[0016] There is also an interlock position between the open position and the closed position. The interlock position coincides with the dead point position or is located between the dead point position and the closed position. During the process of the operating handle moving from the open position to the closed position, when the operating handle moves to the interlock position, the operating handle or operating mechanism drives the interlock mechanism to release the lock on the moving contact.

[0017] Preferably, the push plate is provided with a guide interlocking part, and the interlocking mechanism includes an interlocking element, an interlocking spring, and a linkage element.

[0018] The interlocking spring is connected to the interlocking component and is used to drive the interlocking component to block the guide interlocking part, so as to lock the moving contact in a state where it cannot contact the stationary contact.

[0019] When the operating handle is moved to the interlock position, the operating mechanism drives the interlocking component to overcome the tension of the interlocking spring and move away from the guide interlocking part through the linkage component, so that the push plate releases the obstruction of the moving guide rod.

[0020] Preferably, the device includes multiple phase pole units arranged side-by-side along a first direction. At least a portion of the static and dynamic wiring structures of each phase pole unit are located at both ends of the housing along a second direction. The vacuum interrupter, push mechanism, rotating shaft mechanism, and protection mechanism of each phase pole unit are sequentially arranged along the second direction. An operating mechanism is located on the side of the middle phase pole unit in a third direction and is connected to the rotating shaft mechanism of the middle phase pole unit. The rotating shaft mechanisms of the multiple phase pole units are linked. A traction rod is provided between the operating mechanism and the protection mechanisms of the multiple phase pole units. The protection mechanisms of the multiple phase pole units can trigger the operating mechanism to trip via the traction rod. At least a portion of the dynamic wiring structure passes through the protection mechanism and passes under the rotating shaft mechanism to cooperate with the push mechanism. The first, second, and third directions are perpendicular to each other.

[0021] Preferably, in the third direction, the locking mechanism is located between the rotating shaft mechanism and the operating mechanism; the interlocking mechanism is located on the side of the pushing mechanism in the third direction, and in the second direction, the operating mechanism is located between the interlocking mechanism and the protection mechanism.

[0022] Preferably, the operating mechanism includes a bracket and a linkage mechanism and a rocker arm respectively mounted on the bracket. The rocker arm is connected to the operating handle and includes two opposing swing arms and a connecting arm connected between the two swing arms. The connecting arm is connected to the operating handle. The linkage mechanism includes a rotatably connected transmission component and a jump catch, as well as a lock for locking the jump catch. The transmission component, jump catch, and lock are rotatably mounted on the bracket. The transmission component is provided with a drive shaft, which is connected to the connecting arm of the rocker arm through an energy storage spring. The drive shaft is connected to a rotating shaft mechanism through several linkages.

[0023] Preferably, the rotating shaft mechanism includes a rotating seat rotatably disposed in the housing, and a rotatable rotating shaft connecting rod is provided on the inner side of the rotating seat, the rotating shaft connecting rod being rotatably connected to the guide rod;

[0024] The rotating shaft connecting rod includes a closing driven part and a opening driven part located on both sides of the rotating shaft axis of the rotating shaft connecting rod. The rotating seat is provided with a closing drive plate and an opening drive part corresponding to the closing driven part and the opening driven part, respectively. The closing drive plate is rotatably connected to the rotating seat. The rotating seat is provided with a contact spring connected to the closing drive plate. When closing, the rotating seat drives the closing drive plate to push the closing driven part, so that the moving guide rod drives the moving contact to contact the stationary contact. The contact spring pushes the moving contact to press the stationary contact together through the closing drive plate. When opening and tripping, the rotating seat drives the opening drive part to push the opening driven part, so that the moving guide rod drives the moving contact to separate from the stationary contact.

[0025] Preferably, the rotating base has mounting shafts on its two opposite sides along the first direction, the mounting shafts of the rotating bases of adjacent phase pole units are connected, the housing has a first rotating shaft mounting platform corresponding to the mounting shaft, and a first rotating shaft mounting plate mounted on the first rotating shaft mounting platform.

[0026] The first rotating shaft mounting platform and the first rotating shaft mounting plate are respectively provided with a semi-circular first lower mounting half hole and a first upper mounting half hole. The mounting shaft can be partially inserted into the first lower mounting half hole. The first rotating shaft mounting plate can be installed on the first rotating shaft mounting platform when the first upper mounting half hole is aligned with the mounting shaft. The mounting shaft is installed between the first lower mounting half hole and the first upper mounting half hole. The rotating seat is rotatably installed in the housing through the mounting shaft.

[0027] Preferably, it also includes an adjustment mechanism, which includes a linkage base, and a traction rod, a trigger element, and a trigger spring respectively disposed on the linkage base. The length direction of the linkage base is parallel to the first direction, and the linkage base is disposed on the side of the protection mechanism of the multiple phase pole units along the third direction. The trigger element is connected to the trigger spring, and the trigger element is fastened to the traction rod. When a fault current occurs, the protection mechanism can push the traction rod to unlock the trigger element, so that the trigger spring drives the trigger element to trigger the operating mechanism to disengage.

[0028] Preferably, the protection mechanism includes an armature, a bimetallic strip, a magnetic yoke, and a protection bracket. The bimetallic strip, the magnetic yoke, and the protection bracket are respectively connected to the moving wire structure. The armature is rotatably mounted on the protection bracket via a protection shaft. An extended trigger rod is provided on the armature. The traction rod is provided with an overload trigger part and a short-circuit trigger part corresponding to the bimetallic strip and the trigger rod, respectively. When the overload current meets the action threshold, the bimetallic strip can bend and push the overload trigger part of the traction rod, triggering the operating mechanism to trip through the traction rod. When the short-circuit current meets the action threshold, the magnetic yoke can attract the armature, causing the trigger rod of the armature to push the short-circuit trigger part of the traction rod, triggering the operating mechanism to trip through the traction rod.

[0029] Preferably, the adjustment mechanism further includes an adjustment rod, and an overload adjustment knob and a short-circuit adjustment knob that cooperate with the adjustment rod and the traction rod respectively. The overload adjustment knob is used to push the traction rod to change the distance between the overload trigger part of the traction rod and the bimetallic strip.

[0030] The adjusting rod is connected to the armature of the protection mechanism of multiple phase pole units through multiple instantaneous springs. The short-circuit adjusting knob is used to push the adjusting rod, thereby changing the resistance applied to the armature by the instantaneous springs.

[0031] Preferably, the end of the stationary guide rod located outside the vacuum tube is connected to the circuit via a stationary connection structure. The stationary connection structure includes a front conductive part and a rear conductive part connected together. The front conductive part is used to connect external wires, and the rear conductive part is located on the side of the front conductive part near the stationary guide rod. The rear conductive part is connected to the stationary guide rod by a first stationary screw. The housing is provided with two limiting slots corresponding to the rear conductive part, and the sides of the rear conductive part can be inserted into the limiting slots for limiting engagement. The rear conductive part is spaced apart from the vacuum tube, and the housing is provided with two limiting plates inserted between the rear conductive part and the vacuum tube. The two limiting plates are arranged opposite each other on both sides of the radial direction of the stationary guide rod, and the stationary guide rod is provided with limiting grooves for fitting onto the limiting plates.

[0032] Preferably, the moving wire structure includes a first conductive part and a third conductive part disposed opposite to each other, and a second conductive part connected between the first conductive part and the third conductive part. The first conductive part is fixedly connected to the guide seat and electrically connected to the push plate through a flexible conductor. The first conductive part is provided with a clearance hole for avoiding the guide structure. A rotating shaft mechanism is provided between the first conductive part and the third conductive part. The second conductive part is disposed on the side of the rotating shaft mechanism in a second direction. A fourth conductive part is provided at the end of the third conductive part away from the second conductive part. The fourth conductive part is used to connect an external wire and is connected to a protection mechanism.

[0033] The vacuum molded case circuit breaker of this embodiment converts the rotational motion of the guide rod into linear motion by providing a guide hole on the guide seat, and ensures that the guide structure can only move linearly along the direction of movement of the moving guide rod, which has the following advantages:

[0034] First, the action is precise, reducing the problem of moving guide rod deviation, and the opening and closing of the circuit breaker is faster and more stable;

[0035] Secondly, it has a longer lifespan. It simplifies the original compound motion of simultaneous rotation and sliding into a single linear motion, which can effectively reduce the wear of the moving guide rod and related parts, and effectively extend the service life.

[0036] Third, it is smaller in size. The multi-layer sealing structure of the vacuum interrupter is simplified, which not only effectively reduces the lateral length of the vacuum interrupter, but also makes the overall volume smaller, the structure more compact, and more suitable for molded case circuit breakers.

[0037] In addition, by using guide ribs to prevent the guide structure from rotating around the axis, not only can additional wear be avoided when the moving guide rod rotates, but the sealing method of the vacuum interrupter to the moving guide rod can also be further simplified, thereby reducing the volume of the vacuum interrupter.

[0038] Furthermore, when the electric repulsion causes the moving contact to separate from the stationary contact, the locking mechanism locks the moving guide rod through the pushing mechanism, keeping the moving contact and the stationary contact separated. This prevents the moving guide rod from resetting and causing continuous arcing between the moving contact and the stationary contact, which could damage the moving contact and the stationary contact, and thus improve the service life of the moving contact and the stationary contact.

[0039] Furthermore, the interlocking mechanism can prevent the moving contact from conducting with the stationary contact before the operating mechanism is fully closed, which helps the operator judge the working status of the product, avoids misjudgment, and reduces safety hazards. Moreover, when the operating handle is moved to the interlocking position, the closing force of the energy storage spring is greater, which can drive the moving contact to quickly contact the stationary contact, realize the rapid closing function, and ensure that sufficient contact pressure is formed between the moving contact and the stationary contact, so as to prevent the moving contact from jumping due to the electric repulsion force, which can easily cause welding between the contacts. Attached Figure Description

[0040] Figure 1 This is an exploded view of a vacuum molded case circuit breaker;

[0041] Figure 2 This is a side view of the phase pole unit.

[0042] Figure 3 This is a schematic diagram of the top side structure of the phase pole unit;

[0043] Figure 4 This is a schematic diagram of the driving mechanism;

[0044] Figure 5 It is a breakdown diagram of the driving mechanism;

[0045] Figure 6 This is a schematic diagram of the operating mechanism;

[0046] Figure 7 This is a cross-sectional view of the operating handle in the open position;

[0047] Figure 8 This is a cross-sectional view of the operating handle in the closed position;

[0048] Figure 9 This is a schematic diagram showing the connection between the operating mechanism and the rotating shaft mechanism;

[0049] Figure 10 This is a schematic diagram of the assembly of the rotating base and the housing;

[0050] Figure 11 This is a schematic diagram of the assembly of the operating mechanism and the housing;

[0051] Figure 12 This is a schematic diagram of the protective mechanism;

[0052] In the picture:

[0053] 1. Operating mechanism; 6. Locking mechanism

[0054] 2 Phase Pole Units 7 Interlocking Mechanism

[0055] 3 Vacuum interrupter chamber 12 Operating handle

[0056] 4 Adjustment mechanism 13 Transmission components

[0057] 5. Driving mechanism 14. Jump dunk

[0058] 15 Locking buckle 212 Second stationary wiring section

[0059] 16 Drive shafts 213 Limit slots

[0060] 17 Energy storage spring 214 Limiting plate

[0061] 19 Connecting rod shaft 215 Limiting groove

[0062] 21 Stationary connection structure 216 First stationary screw

[0063] 22 Moving wire structure 220 Clearance hole

[0064] 23 Rotating shaft mechanism 221 First conductive part

[0065] 24 Protection mechanism 222 Second conductive part

[0066] 31 Vacuum tube 223 Third conductive part

[0067] 32 Moving guide rod 224 Fourth conductive part

[0068] 33 Static guide rod 231 Rotating seat

[0069] 34 Moving contact 232 Drive linkage

[0070] 35 Stationary contact 233 Rotating shaft connecting rod

[0071] 41 Traction rod 234 Closing drive board

[0072] 42 Interlocking base 235 Tripping drive unit

[0073] 43 Trigger element 236 Closing shaft

[0074] 44 Adjusting rod 237 Contact spring

[0075] 45 Overload Adjustment Knob 238 Mounting Shaft

[0076] 46 Short-circuit adjustment knob 241 Armature

[0077] 47 Instantaneous Spring 242 Bimetallic Strip

[0078] 51 Push plate 243 Magnetic yoke

[0079] 52 Flexible conductor 244 Protective bracket

[0080] 53 Guide rod 245 Protective shaft

[0081] 54 Guide seat 246 Trigger lever

[0082] 55 Guide column 411 Towing hook arm

[0083] 56 Locking plate 431 Trigger latch arm

[0084] 57 First Moving Screw 511 Guide Interlock Part

[0085] 61 Locking component 541 Guide hole

[0086] 62 Locking bracket 542 Guide rib

[0087] 63 Locking spring 543 First guide groove

[0088] 71 Interlocking component 544 Second guide groove

[0089] 72 Interlocking spring 561 Locking hole

[0090] 73 Linkage component 811 Third screw

[0091] 102, then tighten the 812 seventh screw.

[0092] 111 Swing arm 813 Eighth screw

[0093] 112 Connecting arm 814 Ninth screw

[0094] 161 Operating Linkage 815 Fourth Screw

[0095] 211 First stationary connection section 2381 First rotating shaft mounting platform

[0096] 2382 Fifth screw; 2383 First shaft mounting plate

[0097] 2384 Phase separator

[0098] 2386 Sixth Screw

[0099] 2387 Second Shaft Mounting Plate

[0100] 2388 bearing Detailed Implementation

[0101] The following embodiments, in conjunction with the accompanying drawings, further illustrate the specific implementation of the vacuum molded case circuit breaker of this utility model. The vacuum molded case circuit breaker of this utility model is not limited to the descriptions in the following embodiments.

[0102] like Figure 1 As shown, the vacuum molded case circuit breaker of this embodiment has a first direction, a second direction and a third direction that are perpendicular to each other. The first direction is parallel to the width direction of the circuit breaker, the second direction is parallel to the length direction of the circuit breaker, and the third direction is parallel to the height direction of the circuit breaker.

[0103] like Figures 1-3 As shown, the vacuum molded case circuit breaker of this embodiment includes a housing and an operating mechanism 1 and a phase pole unit 2 respectively disposed in the housing. The phase pole unit 2 includes a static connection structure 21, a vacuum interrupter 3, a moving connection structure 22, a rotating shaft mechanism 23 and a protection mechanism 24. The operating mechanism 1 is connected to the rotating shaft mechanism 23 of the phase pole unit 2.

[0104] The vacuum interrupter 3 includes a vacuum tube 31, a moving guide rod 32, and a stationary guide rod 33. The moving guide rod 32 and the stationary guide rod 33 are respectively connected to the moving contact 34 and the stationary contact 35 at one end in the vacuum tube 31. The moving guide rod 32 and the stationary guide rod 33 are connected to the circuit through the stationary connection structure 21 and the moving connection structure 22, respectively. The stationary connection structure 36 and the moving connection structure 37 serve as the inlet and outlet terminals, respectively, for connecting the power supply and the load. The moving guide rod 32 is connected to the rotating shaft mechanism 23. The rotating shaft mechanism 23 drives the moving guide rod 32 to move under the drive of the operating mechanism 1, so that the moving guide rod 32 drives the moving contact 34 to contact and separate from the stationary contact 35, so as to respectively connect and disconnect the connected circuit.

[0105] The operating mechanism 1 includes a drive mechanism, a linkage mechanism, and an energy storage spring 17. The linkage mechanism is connected to the rotating shaft mechanism 23 of the phase pole unit 2. The drive mechanism can be a manual operating handle 12 or an electric motor or other electric device. The drive mechanism can drive the rotating shaft mechanism 23 to rotate through the linkage mechanism, so that the rotating shaft mechanism 23 drives the moving contact 34 to contact and separate from the stationary contact 35, and locks the energy storage spring 17 in the energy storage state when the moving contact 34 contacts the stationary contact 35.

[0106] like Figure 6 As shown, the operating mechanism 1 in this embodiment includes a bracket and a linkage mechanism and a rocker arm respectively mounted on the bracket. The rocker arm is connected to the operating handle 12. The rocker arm includes two opposing swing arms 111 and a connecting arm 112 connected between the two swing arms 111. The connecting arm 112 is connected to the operating handle 12. The linkage mechanism includes a transmission component 13 and a jump buckle 14 rotatably connected, and a lock 15 for locking the jump buckle 14. The transmission component 13, the jump buckle 14 and the lock 15 are rotatably mounted on the bracket. The transmission component 13 is provided with a drive shaft 16. The drive shaft 16 is connected to the connecting arm 112 of the rocker arm through an energy storage spring 17. The lock 15 can lock the jump buckle 14, so that the linkage shaft 19 connected to the transmission component 13 and the jump buckle 14 serves as the rotation center of the drive shaft 16. The drive shaft 16 is connected to the rotating shaft mechanism 23 through several linkages.

[0107] The operating handle 12 can move between the open and closed positions, and has a dead point position between the open and closed positions. When the operating handle 12 moves from one of the open and closed positions to the other, it can drive the energy storage spring 17 to rotate, so that the energy storage spring 17 first stores energy and releases energy after passing the dead point position. The component force of the energy storage spring 17 applied to the operating handle 12 in the direction of movement changes from resistance to thrust after passing the dead point position. The energy storage spring 17 drives the operating handle 12 to move to the other of the open and closed positions. When the operating handle 12 moves to the open position, it drives the moving contact 34 to separate from the stationary contact 35 through the operating mechanism 1. When the operating handle 12 moves to the closed position, it drives the moving contact 34 to contact the stationary contact 35 through the operating mechanism 1.

[0108] In this embodiment, the drive shaft 16 is provided with a rotatable operating link 161, which is rotatably connected to the drive link 232. The drive link 232 is connected to the rotating shaft mechanism 23, which is connected to the moving contact 34 through the moving guide rod 32, so that the operating mechanism 1 drives the moving contact 34 to contact and separate from the stationary contact 35. Preferably, the operating mechanism 1 also includes a re-lock 102 rotatably mounted on the bracket. The re-lock 102 is limited to the locking latch 15. The protection mechanism 24 releases the limitation of the locking latch 15 by driving the re-lock 102, triggering the locking latch 15 and the trip latch 14 to unlock. After the trip latch 14 and the locking latch 15 are unlocked, when the operating mechanism 1 moves in the opening direction to perform the re-locking action, it can drive the re-lock 102 to limit the locking latch 15 again, so that the trip latch 14 and the locking latch 15 are locked again. Of course, as other embodiments, the drive shaft 16 can also drive the moving contact 34 in other ways. The circuit breaker in this embodiment is not limited to the operating mechanism 1 in this embodiment.

[0109] When a fault occurs in the line connected to the phase unit 2, such as an overload or short circuit fault, the protection mechanism 24 triggers the operating mechanism 1 to trip, that is, triggers the latch 15 and the jump latch 14 to unlock. The transmission component 13 rotates with the jump latch 14, unlocking and releasing the energy storage spring 17. The energy storage spring 17 releases energy and drives the rotating shaft mechanism 23 to rotate through the drive shaft 16, causing the rotating shaft mechanism 23 to separate the moving contact 34 from the stationary contact 35, thus disconnecting the line connected to the phase unit 2 and realizing the protection function. In this embodiment, the protection mechanism 24 is a thermomagnetic protection mechanism, including overload protection and short circuit protection functions. When a fault such as overload current and / or short circuit current occurs in the line, the thermomagnetic protection mechanism triggers the operating mechanism 1 to trip, releasing the energy storage spring 17. The energy storage spring 17 drives the rotating shaft mechanism 23 to move through the linkage mechanism, causing the moving contact 34 to separate from the stationary contact 35, thereby realizing the overload protection function or the short circuit protection function. Of course, the protection mechanism 24 may also include independent overload protection mechanism and short circuit protection mechanism. The protection mechanism 24 may also be electronic, such as a controllable trip unit, which unlocks the linkage mechanism of the operating mechanism 1 and releases the energy storage spring 17.

[0110] An improvement in this embodiment is that the phase unit 2 further includes a pushing mechanism 5, which includes a guide seat 54, a guide structure, and a guide rod 53. The guide seat 54 has a guide hole 541 with its axis parallel to the direction of movement of the moving guide rod 32. The guide structure is slidably fitted with the guide hole 541. The rotating shaft mechanism 23 is connected to the operating mechanism 1. One end of the guide rod 53 is connected to the rotating shaft mechanism 23, and the other end is connected to the moving guide rod 32 through the guide structure. When the operating mechanism 1 drives the rotating shaft mechanism 23 to rotate, it drives the guide rod 53 to rotate. The rotational motion is converted into linear motion along the axis of the guide hole 541 through the guide structure, so as to drive the moving guide rod 32 to drive the moving contact 34 to contact and separate from the stationary contact 35.

[0111] The vacuum molded case circuit breaker of this embodiment converts the rotational motion of the guide rod 53 into linear motion by providing a guide hole 541 on the guide seat 54, and ensures that the guide structure can only move linearly along the direction of movement of the moving guide rod, which has the following advantages:

[0112] First, the action is precise, reducing the problem of misalignment of the moving guide rod 32, making the opening and closing of the circuit breaker faster and more stable;

[0113] Secondly, it has a longer service life. The original compound motion of simultaneous rotation and sliding is simplified into a single linear motion, which can effectively reduce the wear of the moving guide rod 32 and related parts, and effectively extend the service life.

[0114] Third, it is smaller in size. The multi-layer sealing structure of the vacuum interrupter 3 is simplified, which not only effectively reduces the lateral length of the vacuum interrupter, but also makes the overall volume smaller, the structure more compact, and more suitable for molded case circuit breakers.

[0115] Furthermore, the inner wall of the guide hole 541 is provided with a protruding guide rib 542. The length direction of the guide rib 542 is parallel to the moving direction of the moving guide rod 32. The guide structure is provided with a guide groove that slides on the guide rib 542. The guide rib 542 prevents the guide structure from rotating around the axis. This not only avoids additional wear when the moving guide rod 32 rotates, but also simplifies the sealing method of the vacuum interrupter 3 to the moving guide rod 32, thereby reducing the volume of the vacuum interrupter 3.

[0116] like Figures 4-5 As shown, the guide structure includes a guide portion extending from the end of the moving guide rod 32 away from the moving contact 34. The guide portion is slidably engaged with the guide hole 541. The guide portion is provided with a second guide groove 544, which serves as the guide groove. The second guide groove 544 is slidably engaged with the guide rib 542, and the guide rib 542 directly prevents the moving guide rod 32 from rotating around the axis.

[0117] likeFigures 4-5 As shown, the guide structure also includes a guide post 55 coaxially arranged with the moving guide rod 32. The guide post 55 is connected between the moving guide rod 32 and the guide rod 53. The guide post 55 is slidably engaged with the guide hole 541. The guide post 55 is provided with a first guide groove 543 as the guide groove. The first guide groove 543 is slidably engaged with the guide rib 542. The guide rib 542 prevents the guide post 55 from rotating around the axis, thereby preventing the guide post 55 from driving the moving guide rod 32 to rotate.

[0118] The guide structure of this embodiment includes both the guide part and the guide post 55, or it may include only one of them. Furthermore, the guide groove may be provided on only one of the moving guide rod 32 and the guide post 55, or it may be provided on both the moving guide rod 32 and the guide post 55. In addition, the number of guide ribs 542 corresponds to the number of guide grooves 543; the presence or absence of one or more guide ribs 542 is within the protection scope of this utility model.

[0119] like Figures 4-5 As shown, the pushing mechanism 5 also includes a push plate 51 connected to the guide post 55. The push plate 51 is electrically connected to the moving guide rod 32, and the push plate 51 is electrically connected to the moving connection structure 22 through a flexible conductor 52. The push plate 51 is connected to the rotating shaft mechanism 23 through the guide rod 53. The push plate 51 has a sheet-like structure and is perpendicular to the moving direction of the guide post 55.

[0120] like Figures 4-5 As shown in Figures 7-8, the circuit breaker also includes a locking mechanism 6. When the electric repulsive force separates the moving contact 34 from the stationary contact 35, the locking mechanism 6 will push the mechanism 5 to lock, thereby locking the moving guide rod 32 and the moving contact 34, keeping the moving contact 34 and the stationary contact 35 in a separated state. This prevents the moving guide rod 32 from resetting and causing continuous arcing between the moving contact 34 and the stationary contact 35, which could damage the moving contact 34 and the stationary contact 35 and improve their service life.

[0121] Specifically, the pushing mechanism 5 includes a push plate 51 and a locking plate 56 connected to the push plate 51. One end of the guide rod 53 is rotatably mounted on the locking plate 56. The guide rod 53 drives the push plate 51 to move through the locking plate 56. The first conductive part 221 of the moving wire structure 22 is opposite to and spaced apart from the push plate 51, and the upper ends of the two are electrically connected through a flexible conductor. The moving guide rod 32 is electrically connected to the push plate 51. The first conductive part 221 is located between the moving guide rod 32 and the push plate 51. A connector passes through the first conductive part 221 and the guide post 55 to electrically connect the push plate 51 and the moving guide rod 32. In this embodiment, the connector is a first moving screw 57. When the short-circuit circuit flows through the moving connection structure 22, the flexible conductor, the push plate 51, and the moving guide rod 32, the electric repulsive force between the push plate 51 and the first conductive part 221 accelerates the movement of the push plate 51, causing the moving contact 34 and the stationary contact 35 to separate quickly, and the locking plate 56 moves to the locking position. At this point, the locking mechanism 6 locks the locking plate 56, keeping the moving contact 34 and the stationary contact 35 separated. It should be noted that the electric repulsive force between the push plate 51 and the first conductive part 221 during a short circuit can accelerate the movement of the push plate 51. In other embodiments, the first conductive part 221 can be arranged without spacing from the push plate 51, so that no electric repulsive force is generated between them. In this case, the electric repulsive force between the moving contact 34 and the stationary contact 35 during a short circuit can cause the moving contact 34 and the stationary contact 35 to separate quickly.

[0122] The locking mechanism 6 includes a locking bracket 62 and a locking member 61 and a locking spring 63 respectively disposed on the locking bracket 62. The locking plate 56 is provided with a locking hole 561 that cooperates with the locking member 61. When the short-circuit current flows through the first conductive part 221 of the moving connection structure 22 and the push plate 51, the huge electric repulsive force first drives the push plate 51 to quickly separate the moving contact 34 from the stationary contact 35. When the electric repulsive force separates the moving contact 34 from the stationary contact 35, the push plate 51 drives the locking plate 56 to move to the locking position. The locking hole 561 is hooked by the locking member 61. The locking spring 63 is used to drive the locking member 61 to hook the locking hole 561 to keep it locked. The locking plate 56 prevents the moving guide rod 32 from moving closer to the stationary contact 35, so as to avoid the moving guide rod 32 resetting and causing continuous arcing between the moving contact 34 and the stationary contact 35, which would damage the moving contact 34 and the stationary contact 35. Simultaneously, the protection mechanism will also trigger the tripping of the operating mechanism 1. However, the tripping action of the operating mechanism 1 will be later than the action of the electric repulsive force. The tripped operating mechanism 1 drives the rotating shaft mechanism 23 to rotate towards the open position. The rotating shaft mechanism 23 can drive the locking member 61 to overcome the action of the locking spring 63 and leave the locking hole 561 to unlock the locking plate 56, so that the moving guide rod 32 can subsequently drive the moving contact 34 to contact the stationary contact 35. In this embodiment, an unlocking protrusion is provided above the rotating shaft mechanism 23 to release the locking mechanism 6 from locking the push plate 51. It can be understood that when tripping due to overload current or when manually opening to the position, the pushing mechanism 5 can also be locked by the locking mechanism 6 to prevent the moving contact 34 from accidentally contacting the stationary contact 35; when performing the closing operation again, the locking member 61 can be driven to unlock the locking plate 56.

[0123] Preferably, the locking plate 56, push plate 51, guide post 55, and moving guide rod 32 are fixed together by a first moving screw 57, achieving electrical connection between the push plate 51 and the moving guide rod 32. The push plate 51 and the moving guide rod 32 are made of conductive material. Preferably, the locking plate 56, guide post 55, and guide seat 54 are made of insulating material. One end of the guide rod 53 is rotatably connected to the locking plate 56, and the end of the guide rod 53 away from the locking plate 56 is rotatably connected to the rotating shaft mechanism 23. The locking plate 56, push plate 51, conductive post 55, and moving guide rod 32 can be assembled as a whole and then installed into the circuit breaker housing, reducing assembly difficulty. The locking plate 56 includes two locking side plates arranged opposite each other, and the two locking side plates are rotatably connected to the two guide rods 53 respectively. Of course, the guide rods 53 can also be directly rotatably mounted on the push plate 51, for example, by setting two opposite side plates on the push plate 51 and connecting the two side plates to the two guide rods 53 respectively. All of these fall within the protection scope of this utility model. Without the push plate 51, the guide rod 53 can also be hinged to the guide post 55.

[0124] like Figures 4-5As shown in Figures 7-9, the circuit breaker also includes an interlocking mechanism 7, which is used to lock the moving contact 34 in a state where it cannot contact the stationary contact 35.

[0125] The operating handle 12 is connected to the operating mechanism 1. The operating handle 12 can move between the open position, the interlocked position, and the closed position. It also has an interlocked position between the open and closed positions. The interlocked position coincides with the dead point position or is located between the dead point position and the closed position. When the operating handle 12 moves from the open position to the closed position, the interlocking mechanism 7 locks the moving contact 34 in a state where it cannot contact the stationary contact 35 before the operating handle 12 moves to the interlocked position. When the operating handle 12 moves to the interlocked position, the operating handle 12 or the operating mechanism 1 drives the interlocking mechanism 7 to release the lock on the moving contact 34.

[0126] The circuit breaker in this embodiment, by setting an interlocking mechanism 7, can prevent the moving contact 34 of the vacuum interrupter 3 from conducting with the stationary contact 35 under atmospheric pressure before the operating mechanism 1 is closed. This helps the operator judge the working status of the product, avoids misjudgment, and reduces safety hazards. Moreover, when the operating handle 12 moves to the interlocking position, the closing force of the energy storage spring 17 is greater, which can drive the moving contact 34 to quickly contact the stationary contact 35, realize the fast closing function, and ensure that sufficient contact pressure is formed between the moving contact 34 and the stationary contact 35, so as to prevent the moving contact 34 from jumping due to the electric repulsion force and easily causing contact welding.

[0127] Specifically, the push plate 51 is provided with a guide interlocking part 511, and the interlocking mechanism 7 includes an interlocking member 71, an interlocking spring 72, and a linkage member 73. The interlocking spring 72 is connected to the interlocking member 71 and is used to drive the interlocking member 71 to block the guide interlocking part 511. The push plate 51 blocks the movement of the moving guide rod 32, locking the moving contact 34 in a state where it cannot contact the stationary contact 35. The linkage member 73 cooperates with the operating mechanism 1. When the operating handle 12 moves to the interlocking position, the operating mechanism 1 drives the interlocking member 71 to overcome the force of the interlocking spring 72 and move away from the guide interlocking part 511 through the linkage member 73, so that the interlocking member 71 releases its obstruction of the push plate 51, and the moving guide rod 32 drives the moving contact 34 to contact the stationary contact 35 under the drive of the energy storage spring 17.

[0128] It should be noted that the linkage 73 is used to simultaneously drive multiple interlocking components 71 to block the push plate 51 of each phase pole unit 2. In other embodiments, the linkage 73 may not be provided. In this embodiment, when the operating handle 12 moves from the open position to the interlocking position, the rocker arm of the operating mechanism 1 drives the linkage 73 to release the interlocking mechanism 7 from locking the push plate 51. In other embodiments, the operating handle 12 or other components of the operating mechanism 1 may also directly or indirectly drive the interlocking mechanism 7 to unlock the push plate 51.

[0129] like Figures 7-8 As shown, the rotating shaft mechanism 23 includes a rotating seat 231 rotatably disposed in the housing. The rotating seats 231 of multiple phase pole units 2 are linked together. The rotating seat 231 of the phase pole unit 2 located in the middle is connected to the operating mechanism 1 through two driving links 232 respectively. The two driving links 232 are arranged opposite to each other on both sides of the rotating seat 231. The operating mechanism 1 drives the rotating seat 231 to rotate through the driving links 232. The rotating seat 231 is provided with a rotatable rotating shaft link 233 on its inner side.

[0130] like Figure 4 , 10 As shown, the static wiring structure 21 is U-shaped and includes a first static wiring portion 211 and a second static wiring portion 212 connected together. The first static wiring portion 211 is used to connect external wires, and the second static wiring portion 212 is located on the side of the first static wiring portion 211 near the static guide rod 33. The second static wiring portion 212 is connected to the static guide rod 33 by a first static screw 216. The housing is provided with two limiting slots 213 corresponding to the second static wiring portion 212. The sides of the second static wiring portion 212 can be inserted into the limiting slots 213 for limiting and engagement. The second static wiring portion 212 is spaced apart from the vacuum tube 31. The housing is provided with a slot for inserting the second static wiring portion 212 into the vacuum tube 31. Two limiting plates 214 are arranged opposite each other on both sides of the stationary guide rod 33. The stationary guide rod 33 is provided with a shaft connecting rod 233 for sleeve on the limiting plates 214 and rotatably connected to the guide rod 53. When the rotating seat 231 rotates, it drives the moving guide rod 32 to move through the shaft connecting rod 233 and the guide rod 53. The shaft connecting rod 233 is arranged to coincide with the rotation axis of the rotating seat 231. The shaft connecting rod 233 includes a closing driven part and a opening driven part located on both sides of the rotation axis of the shaft connecting rod 233. The rotating seat 231 is provided with a closing drive plate 234 and an opening drive part 235 corresponding to the closing driven part and the opening driven part, respectively.

[0131] The closing drive plate 234 is rotatably connected to the rotating seat 231. The rotating seat 231 is provided with a contact spring 237 connected to the closing drive plate 234. The rotating shaft connecting rod 233 is connected to the guide rod 53 through the closing rotating shaft 236. When closing, the rotating seat 231 rotates clockwise under the drive of the operating mechanism 1, which drives the closing drive plate 234 to push the closing driven part, so that the rotating shaft connecting rod 233 drives the moving guide rod 32 to move through the guide rod 53, the push plate 51, and the guide column 55. The moving guide rod 32 drives the moving contact 34 to contact the stationary contact 35. After the moving contact 34 contacts the stationary contact 35, the rotating seat 231 continues to rotate at a certain angle, which drives the contact spring 237 to push the closing drive plate 234, so that the moving contact 34 and the stationary contact 35 are pressed together.

[0132] The tripping drive unit 235 is integrally formed with the rotating seat 231. When tripping or tripping, the rotating seat 231 rotates counterclockwise under the drive of the operating mechanism 1, which drives the tripping drive unit 235 to push the tripping driven part, so that the rotating shaft connecting rod 233 drives the moving guide rod 32 to move through the guide rod 53, the push plate 51, and the guide column 55. The moving guide rod 32 drives the moving contact 34 to separate from the stationary contact 35.

[0133] When a phase pole unit 2 is provided in the housing, the rotating seat 231 of the phase pole unit 2 is provided with mounting shafts 238 on opposite sides, such as Figure 10 As shown, the housing is provided with a first rotating shaft mounting platform 2381 corresponding to the mounting shaft 238, and a first rotating shaft mounting plate 2383 mounted on the first rotating shaft mounting platform 2381 by a fifth screw 2382. The first rotating shaft mounting platform 2381 and the first rotating shaft mounting plate 2383 are respectively provided with a semi-circular first lower mounting half hole and a first upper mounting half hole. The mounting shaft 238 can be partially inserted into the first lower mounting half hole. The first rotating shaft mounting plate 2383 can be mounted on the first rotating shaft mounting platform 2381 when the first upper mounting half hole is aligned with the mounting shaft 238, so that the mounting shaft 238 is installed between the first lower mounting half hole and the first upper mounting half hole. The rotating seat 231 is rotatably mounted in the housing by the mounting shaft 238.

[0134] When two or more phase pole units 2 are provided in the housing, such as Figure 11As shown, a phase pole partition 2384 is provided between two adjacent phase pole units 2 in the housing. The phase pole partition 2384 has a phase pole groove corresponding to the rotating connecting shaft. A second rotating shaft mounting platform is provided in the phase pole groove, and a second rotating shaft mounting plate 2387 is mounted on the second rotating shaft mounting platform by a sixth screw 2386. The second rotating shaft mounting platform and the second rotating shaft mounting plate 2387 are respectively provided with a semi-circular first lower mounting half hole and a first upper mounting half hole. The mounting shaft 238 can be partially inserted into the second lower mounting half hole. The second rotating shaft mounting plate 2387 can be mounted on the second rotating shaft mounting platform when the second upper mounting half hole is aligned with the mounting shaft 238, and the mounting shaft 238 is installed between the second lower mounting half hole and the second upper mounting half hole. The phase pole groove on the phase pole partition 2384 is open in the second direction to facilitate the insertion of the mounting shaft 238. The second rotating shaft mounting plate 2387 can not only serve as a mounting seat 231, but also seal the space of the phase pole groove, improve the insulation performance between the phase pole units 2, and limit the rotation of the rotating shaft mechanism 23. Preferably, a bearing 2388 or a bushing is provided on the outer side of the mounting shaft 238. The limiting plate 214 not only limits the stationary guide rod 33 along the first direction, but also, due to its length, prevents the stationary guide rod 33 from rotating. This simplifies the sealing method between the vacuum interrupter and the stationary guide rod 33 and reduces the volume of the vacuum interrupter 3, allowing the reduced-volume vacuum interrupter to be used in molded case circuit breakers. Preferably, both the limiting plate 214 and the limiting slot 213 are arranged parallel to the second direction. The stationary wiring structure 21 and the stationary guide rod 33 can be assembled as a single unit before being directly inserted into the housing along the second direction, offering convenient assembly.

[0135] like Figures 2-4 As shown, the moving wire structure 22 includes a first conductive part 221 and a third conductive part 223 arranged opposite to each other, and a second conductive part 222 connected between the first conductive part 221 and the third conductive part 223. The first conductive part 221 is arranged at a distance from the push plate 51. The first conductive part 221 is fixedly connected to the guide seat 54 and electrically connected to the push plate 51 through a flexible conductor 52. The first conductive part 221 is provided with a clearance hole 220 for avoiding the guide post 55. A rotating shaft mechanism 23 is provided between the first conductive part 221 and the third conductive part 223. The second conductive part 222 is located below the rotating shaft mechanism 23. The operating mechanism 1 is located above the rotating shaft mechanism 23. A fourth conductive part 224 is provided at the end of the third conductive part 223 away from the second conductive part 222. The fourth conductive part 224 is connected to the protection mechanism 24 and is used to connect external wires.

[0136] This embodiment is a 3P circuit breaker, including three phase pole units 2. The three phase pole units 2 are arranged side by side along a first direction. The stationary connection structure 21 and the moving connection structure 22 of each phase pole unit 2 are at least partially located at both ends of the housing in a second direction. The stationary connection structure 21, vacuum interrupter 3, push mechanism 5, rotating shaft mechanism 23, protection mechanism 24, and moving connection structure 22 of each phase pole unit 2 are arranged sequentially along the second direction. The operating mechanism 1 is located on the third-direction side of the middle phase pole unit 2 and is connected to the rotating shaft mechanism 23 of the middle phase pole unit 2. The rotating shaft mechanisms 23 of the three phase pole units 2 are linked. The operating mechanism 1 drives the rotating shaft mechanisms 23 of the other two phase pole units 2 to rotate through the connected rotating shaft mechanism 23, thereby realizing the simultaneous rotation of the three phase pole units 2. The connection and disconnection are achieved by the moving wire structure 22 passing through the protection mechanism 24 above the rotating shaft mechanism 23 of the phase unit 2 in the middle of the third upward operating mechanism 1, and passing through the bottom of the rotating shaft mechanism 23 to cooperate with the push mechanism 5. The first conductive part 221 is opposite to the push plate 51 and is spaced apart, and the upper ends of the two are electrically connected by a flexible conductor. A traction rod 41 is provided between the operating mechanism 1 and the protection mechanism 24 of the three phase units 2. When the protection mechanism 24 of the three phase units 2 has a fault such as overload current or short circuit current in the line, it can drive the operating mechanism 1 to trip through the traction rod 41, and drive the moving contact 34 of the three phase units 2 to separate from the stationary contact 35 through the energy storage spring 17, so as to realize the overload protection function or the short circuit protection function. In the third direction, the locking mechanism 6 is located between the rotating shaft mechanism 23 and the operating mechanism 1; the interlocking mechanism 7 is located on the side of the pushing mechanism 5 in the third direction, that is, above the pushing mechanism 5, and in the second direction, the operating mechanism 1 is located between the interlocking mechanism 7 and the protection mechanism 24, with the linkage 73 and the traction rod 41 located on both sides of the operating mechanism 1 respectively. It is understood that the circuit breaker can also be 2P or 3P+N, that is, only two phase pole units 2 are set, or four phase pole units 2 are set, of which three phase pole units 2 are connected to the live wire, and the other phase pole unit 2 is connected to the neutral wire without the need for the protection mechanism 24; all of these fall within the protection scope of this utility model.

[0137] like Figures 10-11As shown, the housing includes a base and an upper cover (not shown) fitted onto the base. The base, on its side away from the upper cover, is provided with a third screw 811, a fifth screw 2382, a sixth screw 2386, a seventh screw 812, an eighth screw 813, and a ninth screw 814. The third screw 811 is connected to one end of the support of the operating mechanism 1 in a first direction. The other end of the support in the first direction is connected to the guide seat 54 of the pushing mechanism 5 via a fourth screw 815. The fourth screw 815 is located on the side of the base near the upper cover. The fifth screw 2382 and the sixth screw 2386 are connected to the first rotating shaft mounting plate 2383 and the second rotating shaft mounting plate 2387, respectively. The seventh screw 812 is connected to the stationary connection structure 21. The eighth screw 813 is connected to the guide seat 54 of the pushing mechanism 5. The ninth screw 814 is connected to the moving connection structure 22. This design features a reasonable layout and convenient assembly.

[0138] like Figures 11-12 As shown, it also includes an adjustment mechanism, which includes a linkage base 42, and a traction rod 41, a trigger element 43, and a trigger spring (not shown) respectively disposed on the linkage base 42. The length direction of the linkage base 42 is parallel to the first direction. The linkage base 42 is disposed on the side of the protection mechanism 24 of the three phase pole units 2 along the third direction, that is, above the protection mechanism 24. The trigger element 43 is connected to the trigger spring, and the trigger element 43 is fastened to the traction rod 41. The traction rod 41 is fastened to the protection mechanism 24. When the traction rod 41 is fastened to the trigger element 43, it can lock the trigger spring in the energy storage state. When a fault current occurs, the protection mechanism 24 can push the traction rod 41 to unlock the trigger element 43 and release the trigger spring, so that the trigger spring drives the trigger element 43 to trigger the operating mechanism 1 to disengage. The trigger spring can drive the trigger element 43 to directly unlock the lock 15 and the jump lock 14, or the trigger spring can drive the trigger element 43 to unlock the lock 15 and the jump lock 14 through the re-fastening 102.

[0139] Furthermore, the protection mechanism 24 includes an armature 241, a bimetallic strip 242, a magnetic yoke 243, and a protection bracket 244. The bimetallic strip 242, the magnetic yoke 243, and the protection bracket 244 are respectively connected to the moving connection structure 22. The armature 241 is rotatably mounted on the protection bracket 244 via a protection shaft 245. An extended trigger rod 246 is provided on the armature 241. The traction rod 41 is provided with an overload trigger part and a short-circuit trigger part corresponding to the bimetallic strip 242 and the trigger rod 246, respectively. When the overload current meets the action threshold, the bimetallic strip 242 can bend and push the overload trigger part of the traction rod 41, triggering the operating mechanism 1 to trip and achieve overload protection. When the short-circuit current meets the action threshold, the magnetic yoke 243 can attract the armature 241, causing the trigger rod 246 of the armature 241 to push the short-circuit trigger part of the traction rod 41, triggering the operating mechanism 1 to trip and achieve short-circuit protection.

[0140] Furthermore, the adjustment mechanism also includes an adjustment rod 44, and an overload adjustment knob 45 and a short-circuit adjustment knob 46 that cooperate with the adjustment rod 44 and the traction rod 41 respectively. The overload adjustment knob 45 is used to push the traction rod 41 to change its initial position, thereby changing the distance between the overload trigger part of the traction rod 41 and the bimetallic strip 242, so as to adjust the action threshold of the overload current.

[0141] The adjusting rod 44 is connected to the armatures 241 of the three phase pole units 2 respectively through three instantaneous springs 47. When the short-circuit current meets the action threshold and attracts the armature 241, the magnetic yoke 243 causes the trigger rod 246 of the armature 241 to overcome the resistance of the instantaneous springs 47 and push the short-circuit trigger part of the traction rod 41. The short-circuit adjustment knob 46 is used to push the adjusting rod 44 to change the initial position, thereby changing the resistance applied to the armature 241 by the instantaneous springs 47, so as to adjust the action threshold of the short-circuit current.

[0142] The initial position of the traction rod 41 can be changed by adjusting the overload adjustment knob 45, eliminating the need for separate adjustment screws on each bimetallic strip 242, resulting in better consistency and easier adjustment. Furthermore, the short-circuit adjustment knob 46 can also be used to adjust the short-circuit current threshold. In addition, the linkage mechanism can be assembled together first and then as a whole into the housing, offering convenient assembly.

[0143] like Figure 8 As shown, when the operating handle 12 is in the open position and begins to move towards the close position, the operating mechanism 1 drives the rotating shaft mechanism 23 to rotate clockwise through the driving link 232. The rotating shaft mechanism 23 drives the moving guide rod 32 to separate from the stationary contact 35, thereby realizing the product opening.

[0144] like Figure 7As shown, when the operating handle 12 is in the open position and begins to move towards the close position, the closing operation is performed. The operating mechanism 1 drives the rotating shaft mechanism 23 to rotate counterclockwise through the driving linkage 232. The rotating shaft mechanism 23 drives the moving guide rod 32 to contact the stationary contact 35, realizing the product closing. At this time, the contact spring 237 in the rotating shaft mechanism 23 drives the moving contact 34 to reliably press against the stationary contact 35.

[0145] When there is a short circuit current, which is generally greater than 10 times the rated current, the magnetic yoke 243 attracts the armature 241 and rotates against the force of the instantaneous spring 47 towards the magnetic yoke 243. The armature 241 strikes the short circuit trigger part of the traction rod 41, causing the traction rod 41 to start to flip. During the flipping process, the traction hook arm 411 drives the trigger hook arm 431 of the trigger member 43 to unlock. After the trigger member 43 is unlocked, it rotates under the action of the trigger spring and hits the re-lock 102 of the operating mechanism 1. Before this, the huge electric repulsive force first drives the push plate 51 to drive the moving contact 34 and the stationary contact 35 to quickly separate. The push plate 51 drives the locking hole 561 on the locking plate 56 to move to the locked member 61 for locking.

[0146] When there is an overload current, the bimetallic strip 242 is heated and bent. The bimetallic strip 242 is provided with a movable adjusting screw. The bimetallic strip 242 can push the traction rod 41 to flip. During the flipping process of the traction rod 41, the traction latch arm 411 of the traction rod 41 and the trigger latch arm 431 of the trigger member 43 are unlocked. After unlocking, the trigger member 43 rotates under the action of the trigger spring and hits the re-latch 102 of the operating mechanism 1.

[0147] When the latch 102 is hit, it will cause the latch to unlock and jump, thus releasing the latch. During the release process, the energy storage spring 17 drives the rotating seat 231 to rotate clockwise through the drive link 232. The rotating seat 231 drives the moving guide rod 32 to move, causing the stationary contact 35 to move, so that the moving contact 34 separates from the stationary contact 35, thus releasing the latch.

[0148] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0149] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of this utility model. It should not be construed that the specific implementation of this utility model is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the inventive concept of this utility model, and all such modifications and substitutions should be considered within the protection scope of this utility model.

Claims

1. A vacuum molded case circuit breaker, comprising a housing and an operating mechanism (1) and a phase unit (2) respectively disposed in the housing, characterized in that: The phase pole unit (2) includes a vacuum interrupter (3), a pushing mechanism (5), and a rotating shaft mechanism (23). The vacuum interrupter (3) includes a vacuum tube (31), a moving guide rod (32), and a stationary guide rod (33). The moving guide rod (32) and the stationary guide rod (33) are respectively provided with a moving contact (34) and a stationary contact (35) at one end of the vacuum tube (31). The pushing mechanism (5) includes a guide seat (54), a guide structure, and a guide rod (53). The guide seat (54) has a guide hole (541) with its axis parallel to the direction of movement of the moving guide rod (32). The guide structure is slidably fitted with the guide hole (541). The rotating shaft mechanism (23) is connected to the operating mechanism (1). One end of the guide rod (53) is connected to the rotating shaft mechanism (23), and the other end is connected to the moving guide rod (32) through the guide structure. When the operating mechanism (1) drives the rotating shaft mechanism (23) to rotate, it drives the guide rod (53) to rotate. The rotational motion is converted into linear motion along the axis of the guide hole (541) through the guide structure, so as to drive the moving guide rod (32) to drive the moving contact (34) to contact and separate from the stationary contact (35).

2. The vacuum molded case circuit breaker according to claim 1, characterized in that: The guide structure includes a guide portion extending from the end of the moving guide rod (32) away from the moving contact (34), the guide portion being slidably engaged with the guide hole (541); and / or, the guide structure includes a guide post (55) coaxially arranged with the moving guide rod (32), the guide post (55) being connected between the moving guide rod (32) and the guide rod (53), the guide post (55) being slidably engaged with the guide hole (541).

3. The vacuum molded case circuit breaker according to claim 2, characterized in that: The inner wall of the guide hole (541) is provided with a protruding guide rib (542). The length direction of the guide rib (542) is parallel to the moving direction of the moving guide rod (32). The guide structure is provided with a guide groove that slides on the guide rib (542) to prevent the guide structure from rotating around the axis.

4. The vacuum molded case circuit breaker according to claim 1, characterized in that: The pushing mechanism also includes a push plate (51) connected to the guide structure. The push plate (51) is electrically connected to the moving guide rod (32), and the push plate (51) is electrically connected to the moving wire structure (22) through a flexible conductor. The push plate (51) is connected to the rotating shaft mechanism (23) through the guide rod (53).

5. The vacuum molded case circuit breaker according to claim 4, characterized in that: The pushing mechanism (5) includes a locking plate (56) connected to the push plate (51), and the first conductive part (221) of the moving wire structure (22) is opposite to the push plate (51) and spaced apart and electrically connected by a flexible conductor. The first conductive part (221) is located between the moving guide rod (32) and the push plate (51). The connecting member passes through the first conductive part (221) and the guide structure to electrically connect the push plate (51) and the moving guide rod (32). The vacuum molded case circuit breaker also includes a locking mechanism (6). When the electric repulsive force drives the push plate (51) to move, causing the moving contact (34) to quickly separate from the stationary contact (35) and the locking plate (56) to move to the locking position, the locking mechanism (6) locks the locking plate (56) so that the moving contact (34) and the stationary contact (35) remain separated.

6. The vacuum molded case circuit breaker according to claim 5, characterized in that: The locking mechanism (6) includes a locking member (61) and a locking spring (63). The locking plate (56) is provided with a locking hole (561) that cooperates with the locking member (61). When the electric repulsive force causes the push plate (51) to move the locking plate (56) to the locking position, the locking hole (561) on the locking plate (56) is hooked by the locking member (61). The locking spring (63) is used to drive the locking member (61) to hook the locking hole (561) and keep it locked.

7. The vacuum molded case circuit breaker according to claim 4, characterized in that: It also includes an interlocking mechanism (7) for locking the moving contact (34) in a state where it cannot contact the stationary contact (35). The operating handle (12) is connected to the operating mechanism (1). The operating handle (12) can move between the open position and the closed position. The operating mechanism (1) includes an energy storage spring (17) and has a dead point position between the open position and the closed position. When the operating handle (12) moves from one of the open position and the closed position to the dead point position, it can drive the energy storage spring (17) to rotate, so that the energy storage spring (17) stores energy first and releases energy after passing the dead point position. The component force of the energy storage spring applied to the operating handle (12) in the direction of movement changes from resistance to thrust after passing the dead point position. The energy storage spring (17) drives the operating handle (12) to move to the other of the open position and the closed position. When the operating handle (12) moves to the open position, it drives the moving contact (34) to separate from the stationary contact (35). When the operating handle (12) moves to the closed position, it drives the moving contact (34) to contact the stationary contact (35). There is also an interlock position between the open position and the closed position. The interlock position coincides with the dead position or is located between the dead position and the closed position. During the process of the operating handle (12) moving from the open position to the closed position, when the operating handle (12) moves to the interlock position, the operating handle (12) or the operating mechanism (1) drives the interlock mechanism (7) to release the lock of the moving contact (34).

8. The vacuum molded case circuit breaker according to claim 7, characterized in that: The push plate (51) is provided with a guide interlock part (511), and the interlocking mechanism (7) includes an interlocking component (71), an interlocking spring (72), and a linkage component (73). The interlocking spring (72) is connected to the interlocking member (71) and is used to drive the interlocking member (71) to block the guide interlocking part (511) so as to lock the moving contact (34) in a state where it cannot contact the stationary contact (35). When the operating handle (12) moves to the interlock position, the operating mechanism (1) drives the interlocking component (71) through the linkage component (73) to overcome the tension of the interlocking spring (72) and move away from the guide interlocking part (511), so that the push plate (51) releases the obstruction of the moving guide rod (32).

9. The vacuum molded case circuit breaker according to any one of claims 1-8, characterized in that: The system includes multiple phase pole units (2), which are arranged side by side along a first direction. The static wiring structure (21) and dynamic wiring structure (22) of each phase pole unit (2) are at least partially located at both ends of the housing in a second direction. The vacuum interrupter (3), pushing mechanism (5), rotating shaft mechanism (23), and protection mechanism (24) of each phase pole unit (2) are arranged sequentially along the second direction. The operating mechanism (1) is located on the third-direction side of the middle phase pole unit (2) and is connected to the rotating shaft mechanism of the middle phase pole unit (2). (23) Connected, the rotating shaft mechanism (23) of multiple phase pole units (2) are linked, and a traction rod (41) is provided between the operating mechanism (1) and the protection mechanism (24) of multiple phase pole units (2). The protection mechanism (24) of multiple phase pole units (2) can trigger the operating mechanism (1) to disengage through the traction rod (41). At least part of the moving wire structure (22) passes through the protection mechanism (24) and passes under the rotating shaft mechanism (23) to cooperate with the pushing mechanism (5); the first direction, the second direction and the third direction are perpendicular to each other.

10. The vacuum molded case circuit breaker according to claim 7, characterized in that: The system includes multiple phase pole units (2), which are arranged side by side along a first direction. The static wiring structure (21) and dynamic wiring structure (22) of each phase pole unit (2) are at least partially located at both ends of the housing in a second direction. The vacuum interrupter (3), pushing mechanism (5), rotating shaft mechanism (23), and protection mechanism (24) of each phase pole unit (2) are arranged sequentially along the second direction. The operating mechanism (1) is located on the third-direction side of the middle phase pole unit (2) and is connected to the rotating shaft mechanism (23) of the middle phase pole unit (2). The rotating shaft mechanisms (23) of the multiple phase pole units (2) are linked together. A traction rod (41) is provided between the operating mechanism (1) and the protection mechanism (24) of the multiple phase pole units (2). The operating mechanism (1) can be triggered to trip by the traction rod (41) respectively. The first direction, the second direction and the third direction are perpendicular to each other. The vacuum molded case circuit breaker also includes a locking mechanism (6). When the electric repulsive force drives the push plate (51) to move, the moving contact (34) and the stationary contact (35) are quickly separated and the locking plate (56) moves to the locking position, the locking mechanism (6) locks the locking plate (56) so that the moving contact (34) and the stationary contact (35) remain separated. In the third direction, the locking mechanism (6) is located between the rotating shaft mechanism (23) and the operating mechanism (1). The interlocking mechanism (7) is located on the side of the push mechanism (5) in the third direction, and in the second direction, the operating mechanism (1) is located between the interlocking mechanism (7) and the protection mechanism (24).

11. The vacuum molded case circuit breaker according to claim 1, characterized in that: The operating mechanism (1) includes a bracket and a linkage mechanism and a rocker arm respectively mounted on the bracket. The rocker arm is connected to the operating handle (12). The rocker arm includes two opposing swing arms (111) and a connecting arm (112) connected between the two swing arms (111). The connecting arm (112) is connected to the operating handle (12). The linkage mechanism includes a rotatably connected transmission component (13) and a jump buckle (14), and a lock buckle (15) for locking the jump buckle (14). The transmission component (13), the jump buckle (14) and the lock buckle (15) are rotatably mounted on the bracket. The transmission component (13) is provided with a drive shaft (16). The drive shaft (16) is connected to the connecting arm (112) of the rocker arm through an energy storage spring (17). The drive shaft (16) is connected to the rotating shaft mechanism (23) through several connecting rods.

12. The vacuum molded case circuit breaker according to claim 1, characterized in that: The rotating shaft mechanism (23) includes a rotating seat (231) rotatably disposed in the housing, and a rotatable rotating shaft connecting rod (233) is provided on the inner side of the rotating seat (231), and the rotating shaft connecting rod (233) is rotatably connected to the guide rod (53); The rotating shaft connecting rod (233) includes a closing driven part and a opening driven part located on both sides of the rotating shaft axis of the rotating shaft connecting rod (233). The rotating seat (231) is provided with a closing drive plate (234) and an opening drive part (235) corresponding to the closing driven part and the opening driven part, respectively. The closing drive plate (234) is rotatably connected to the rotating seat (231). The rotating seat (231) is provided with a contact spring (237) connected to the closing drive plate (234). 231) When closing, the closing drive plate (234) is driven to push the closing driven part, so that the moving guide rod (32) drives the moving contact (34) to contact the stationary contact (35), and the contact spring (237) pushes the moving contact (34) and the stationary contact (35) to press together through the closing drive plate (234); when opening and tripping, the rotating seat (231) drives the opening drive part (235) to push the opening driven part, so that the moving guide rod (32) drives the moving contact (34) to separate from the stationary contact (35).

13. The vacuum molded case circuit breaker according to claim 12, characterized in that: The rotating base (231) is provided with mounting shafts (238) on its two opposite sides along the first direction. The mounting shafts (238) of the rotating bases (231) of adjacent phase pole units (2) are connected. The housing is provided with a first rotating shaft mounting platform (2381) corresponding to the mounting shaft (238), and a first rotating shaft mounting plate (2383) mounted on the first rotating shaft mounting platform (2381). The first rotating shaft mounting platform (2381) and the first rotating shaft mounting plate (2383) are respectively provided with a semi-circular first lower mounting half hole and a first upper mounting half hole. The mounting shaft (238) can be partially inserted into the first lower mounting half hole. The first rotating shaft mounting plate (2383) can be installed on the first rotating shaft mounting platform (2381) when the first upper mounting half hole is aligned with the mounting shaft (238). The mounting shaft (238) is installed between the first lower mounting half hole and the first upper mounting half hole. The rotating seat (231) is rotatably installed in the housing through the mounting shaft (238).

14. The vacuum molded case circuit breaker according to claim 9, characterized in that: It also includes an adjustment mechanism (4), which includes a linkage base (42), and a traction rod (41), a trigger (43) and a trigger spring respectively disposed on the linkage base (42). The length direction of the linkage base (42) is parallel to the first direction. The linkage base (42) is disposed on the side of the protection mechanism (24) of the multiple phase pole units (2) along the third direction. The trigger (43) is connected to the trigger spring. The trigger (43) is fastened to the traction rod (41). When a fault current occurs, the protection mechanism (24) can push the traction rod (41) to unlock the trigger (43), so that the trigger spring drives the trigger (43) to trigger the operating mechanism (1) to disengage.

15. The vacuum molded case circuit breaker according to claim 14, characterized in that: The protective mechanism (24) includes an armature (241), a bimetallic strip (242), a magnetic yoke (243), and a protective bracket (244). The bimetallic strip (242), the magnetic yoke (243), and the protective bracket (244) are respectively connected to the moving wire structure (22). The armature (241) is rotatably mounted on the protective bracket (244) via a protective rotating shaft (245). An extended trigger rod (246) is provided on the armature (241). The traction rod (41) is provided with a connection to the bimetallic strip (242) and the trigger rod (246). 246) Corresponding to the overload triggering part and short circuit triggering part respectively, the bimetallic strip (242) can bend and push the overload triggering part of the traction rod (41) when the overload current meets the action threshold, and trigger the operating mechanism (1) to disengage through the traction rod (41). The magnetic yoke (243) can attract the armature (241) when the short circuit current meets the action threshold, so that the triggering rod (246) of the armature (241) pushes the short circuit triggering part of the traction rod (41), and triggers the operating mechanism (1) to disengage through the traction rod (41).

16. The vacuum molded case circuit breaker according to claim 15, characterized in that: The adjustment mechanism (4) also includes an adjustment rod (44), and an overload adjustment knob (45) and a short-circuit adjustment knob (46) that cooperate with the adjustment rod (44) and the traction rod (41) respectively. The overload adjustment knob (45) is used to push the traction rod (41) to change the distance between the overload trigger part of the traction rod (41) and the bimetallic strip (242). The adjusting rod (44) is connected to the armature (241) of the protection mechanism (24) of multiple phase pole units (2) through multiple instantaneous springs (47). The short-circuit adjusting knob (46) is used to push the adjusting rod (44) to change the resistance applied to the armature (241) by the instantaneous springs (47).

17. The vacuum molded case circuit breaker according to claim 9, characterized in that: The stationary guide rod (33) is connected to the circuit at one end outside the vacuum tube (31) via a stationary connection structure (21). The stationary connection structure (21) includes a front conductive part (211) and a rear conductive part (212) connected together. The front conductive part (211) is used to connect external wires, and the rear conductive part (212) is located on the side of the front conductive part (211) near the stationary guide rod (33). The rear conductive part (212) is connected to the stationary guide rod (33) by a first stationary screw (216). The housing is provided with a connector to the rear conductive part (212). The two corresponding limiting slots (213) allow the sides of the rear conductive part (212) to be inserted into the limiting slots (213) for limiting engagement; the rear conductive part (212) and the vacuum tube (31) are spaced apart, and the housing is provided with two limiting plates (214) inserted between the rear conductive part (212) and the vacuum tube (31). The two limiting plates (214) are arranged opposite to each other on both sides of the radial direction of the stationary guide rod (33), and the stationary guide rod (33) is provided with limiting grooves (215) for fitting onto the limiting plates (214).

18. The vacuum molded case circuit breaker according to claim 9, characterized in that: The moving wire structure (22) includes a first conductive part (221) and a third conductive part (223) arranged opposite to each other, and a second conductive part (222) connected between the first conductive part (221) and the third conductive part (223). The first conductive part (221) is fixedly connected to the guide seat (54) and electrically connected to the push plate (51) through a flexible conductor (52). The first conductive part (221) is provided with a clearance hole (220) for avoiding the guide structure. A rotating shaft mechanism (23) is provided between the first conductive part (221) and the third conductive part (223). The second conductive part (222) is provided on the side of the rotating shaft mechanism (23) in the second direction. A fourth conductive part (224) is provided at the end of the third conductive part (223) away from the second conductive part (222). The fourth conductive part (224) is used to connect external wires and is connected to the protection mechanism (24).

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