A circuit breaker with an external vacuum interrupter

Abstract

The application discloses a circuit breaker with external vacuum arc-extinguishing chamber and belongs to the technical field of circuit breakers. The circuit breaker with external vacuum arc-extinguishing chamber comprises a circuit breaker body, a plurality of external arc-extinguishing chambers arranged on the circuit breaker body, a terminal fixedly arranged at the top of each external arc-extinguishing chamber, a pad fixedly arranged on the side wall of the terminal, a movable fixing jaw arranged outside the pad, a plurality of arc-shaped rods, a top equalizing ring fixedly arranged at the other end of the arc-shaped rods, two connecting rods fixedly arranged at the bottom of the top equalizing ring, and a bottom equalizing ring fixedly arranged at the bottom of the connecting rods. The top equalizing ring and the bottom equalizing ring are arranged outside the external arc-extinguishing chamber, so that the electric field of the external arc-extinguishing chamber can be homogenized. In addition, the top equalizing ring and the bottom equalizing ring can be fixed on the side wall of the external arc-extinguishing chamber due to the existence of the fixing jaw and the fixing mechanism, so that the influence of vibration during the opening and closing operation of the circuit breaker can be avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of circuit breakers, and particularly relates to a circuit breaker with an external vacuum arc-extinguishing chamber. BACKGROUND

[0002] Before the invention of circuit breakers, the protection of circuit overload or short circuit mainly relied on fuses, but since the fuses had to be replaced after melting, it was very inconvenient, so people urgently needed a reusable circuit protection device, and circuit breakers came into being. The initial circuit breakers were more like switches with arc-extinguishing functions, which used springs, gravity and electromagnetic effects to disconnect the circuit in the event of a fault. Now, air circuit breakers that combine thermal trip and electromagnetic trip have become mainstream. This kind of circuit breaker uses air as the insulation and arc-extinguishing medium, and has a compact structure and is safe and reliable. The vacuum arc-extinguishing chamber is a sealed cavity that extinguishes electric arcs through a high-vacuum environment, and it is the core component of the vacuum circuit breaker, determining the breaking performance and service life of the circuit breaker.

[0003] In a Chinese patent with the publication number CN117438242A, a vacuum arc-extinguishing chamber, a vacuum arc-extinguishing chamber device and a vacuum circuit breaker are mentioned. The invention provides a vacuum arc-extinguishing chamber, which includes a shell, a static contact and a dynamic contact. The static contact is movably assembled on the shell along the connecting line direction of the static contact and the dynamic contact. The end of the static contact away from the dynamic contact is provided with a connecting structure for direct or indirect transmission connection with the dynamic contact of another vacuum arc-extinguishing chamber. The invention also provides a vacuum arc-extinguishing chamber device and a vacuum circuit breaker containing the above-mentioned vacuum arc-extinguishing chamber. By setting two movable contacts, one vacuum arc-extinguishing chamber can drive another vacuum arc-extinguishing chamber to close or open, thereby eliminating the need for a combination support.

[0004] The external vacuum arc-extinguishing chamber not only has better heat dissipation, but also is more convenient to maintain. However, the disadvantages are also very obvious. At the breaking point, the edge of the shielding cover and the connecting position of the guide rod, the originally smooth shape becomes an acute angle or an edge due to the sudden change in geometry, resulting in a high concentration of electric field. In order to make the electric field strength as evenly distributed as possible and avoid local field strength being too high, a grading ring needs to be provided outside the vacuum arc-extinguishing chamber to optimize the electrode shape and homogenize the electric field from the source. However, the circuit breaker will produce severe mechanical impact and vibration during opening and closing operations. The fasteners such as bolts and clamps that fix the grading ring may loosen under long-term vibration. Once the fasteners loosen, not only will the grading effect be greatly reduced, but the falling parts may also cause serious accidents such as inter-phase short circuit or ground short circuit inside the switchgear. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a circuit breaker with an external vacuum arc-extinguishing chamber.

[0006] The technical scheme adopted to solve the above technical problems is:

[0007] A circuit breaker with an external vacuum arc-extinguishing chamber, comprising a circuit breaker body, wherein an external arc-extinguishing chamber is arranged on the circuit breaker body, a terminal is fixedly arranged at the top of the external arc-extinguishing chamber, a cushion block is fixedly arranged on the side wall of the terminal, a movable fixing clamp is arranged outside the cushion block, a plurality of fixing holes are arranged in the side wall of the cushion block, and the heights of the fixing holes are consistent with the height of the fixing clamp.

[0008] A plurality of arc-shaped rods are fixedly arranged on the side wall of the fixing clamp, a top equalizing ring is fixedly arranged at the other end of the arc-shaped rods, two connecting rods are fixedly arranged at the bottom of the top equalizing ring, and a bottom equalizing ring is fixedly arranged at the bottom of the connecting rods.

[0009] Two abutting rods are movably arranged on the side wall of the bottom equalizing ring, the abutting rods are in abutment with the side wall of the external arc-extinguishing chamber, and a fixing mechanism for driving the abutting rods is arranged between the bottom equalizing ring and the top equalizing ring.

[0010] According to the above technical scheme, the top equalizing ring and the bottom equalizing ring are arranged outside the external arc-extinguishing chamber, the electric field of the external arc-extinguishing chamber can be homogenized, and the top equalizing ring and the bottom equalizing ring can be fixed on the side wall of the external arc-extinguishing chamber due to the existence of the fixing clamp and the fixing mechanism, so that the influence of vibration during the opening and closing operation of the circuit breaker is avoided.

[0011] Further, the fixing clamp comprises a bottom plate, a first bevel gear, two second bevel gears, a toothed disc, a top plate, three fixing rings and a plurality of fixing clamps, the bottom plate is buckled with the top plate, the side walls of the bottom plate and the top plate are provided with central holes, the terminal passes through the central holes, the side walls of the bottom plate and the top plate are provided with three rotating holes, the three fixing rings are arranged on the side wall of the bottom plate, the positions of the three fixing rings correspond to the positions of the three rotating holes, the first bevel gear and the two second bevel gears are rotatably connected with the inner walls of the three fixing rings, the toothed disc is provided with a bevel gear at the bottom and a flat thread at the top, the first bevel gear and the second bevel gears are engaged with the bevel gear, the side wall of the first bevel gear is provided with a driving groove, the side walls of the two second bevel gears are fixedly provided with threaded rods, the threaded rods are externally threadedly connected with a moving sleeve, the bottoms of the plurality of fixing clamps are engaged with the flat thread, the side wall of the top plate is provided with a plurality of limiting grooves, the plurality of fixing clamps are slidably connected with the side walls of the limiting grooves, the side walls of the fixing clamps are fixedly provided with fixing insertion rods, and the fixing insertion rods are respectively inserted into the fixing holes.

[0012] Through the technical scheme, when the staff uses the tool with the specific shape to rotate the driving groove, the first bevel gear drives the bevel gear to rotate, since the first bevel gear and the second bevel gear are engaged with the bevel gear, when the bevel gear drives the toothed disc to rotate, the two second bevel gears rotate, and the threaded rod rotates, thus the movement sleeve arranged on the threaded rod moves along the threaded rod, when the toothed disc rotates, since the flat thread is engaged with the fixed clamping jaw, the fixed clamping jaw makes the fixed insertion rod inserted into the fixed hole, and the fixed clamping jaw is fixed outside the cushion block.

[0013] Further, the top equalizing ring is a circular ring, and the bottom equalizing ring is a C-shaped ring, and the inner diameter of the bottom equalizing ring is larger than that of the top equalizing ring.

[0014] Through the technical scheme, although a closed symmetrical circular ring has the same curvature radius in all directions, can form a perfect equipotential body, which can uniformly "push away" the power lines in all directions, and provide a full- range, dead- angle-free uniform electric field shielding for the external vacuum arc-extinguishing chamber, the effect is the best, but the non-closed ring verified by accurate electric field simulation is also a completely feasible and common engineering solution, therefore, the C-shaped bottom equalizing ring can also play an equalizing role, since the combination of the top equalizing ring and the bottom equalizing ring needs to be arranged outside the external arc-extinguishing chamber, in order to facilitate the arrangement of the two, the bottom equalizing ring needs to be arranged in an open shape, the top equalizing ring can be fixed outside the cushion block by the fixed clamping jaw, therefore, the top equalizing ring does not need to be arranged in an open shape, and the smaller inner diameter of the top equalizing ring is because the outer diameter of the cushion block is smaller than that of the external arc-extinguishing chamber, therefore, the top equalizing ring does not need to be arranged too large, and the smaller arrangement can facilitate the fixing effect between the fixed clamping jaw and the cushion block.

[0015] Further, the threaded rod distal from the second bevel gear is movably provided with a baffle, and the outer diameter of the baffle is larger than that of the threaded rod.

[0016] Through the technical scheme, the baffle is arranged to prevent the movement sleeve from completely separating from the position of the threaded rod, therefore, the outer diameter of the baffle needs to be larger than that of the threaded rod, and further, the outer diameter of the baffle should be larger than that of the movement sleeve, so as to prevent the movement sleeve from separating.

[0017] Further, the resistance rod comprises an inclined rod, a gasket and a rotating ring, two rotating grooves are arranged in the sidewall of the bottom equalizing ring, two rotating rings are rotatably connected with the inner walls of the two rotating grooves respectively, the inclined rod is fixedly connected with the sidewall of the rotating ring, the other end of the inclined rod is fixedly connected with the sidewall of the gasket, and the gasket abuts against the sidewall of the external arc-extinguishing chamber.

[0018] Through the technical scheme, the gasket abuts against the side wall of the external arc-extinguishing chamber, so that the bottom voltage-sharing ring can be fixed outside the external arc-extinguishing chamber and can also be used to share the voltage outside the external arc-extinguishing chamber, thereby ensuring the safety of the external arc-extinguishing chamber, and the setting of the rotating groove ensures the movement track of the rotating ring, and the gasket is fixed to the external arc-extinguishing chamber by being limited in the rotating groove.

[0019] Further, the outer parts of the two arc-shaped rods on the two sides of the threaded rod are movably sleeved with lifting sleeves, a common rod is fixedly arranged between the two lifting sleeves, the common rod is a telescopic rod, a pulling rod is rotatably connected to the side wall of the common rod, and the other end of the pulling rod is rotatably connected to the side wall of the movement sleeve.

[0020] Through the technical scheme, the movement sleeve moves axially under the driving of the threaded rod, and the pulling rod rotatably connected to the movement sleeve can drive the common rod and the lifting sleeve to move along the arc-shaped rod, and when the lifting sleeve moves along the arc-shaped rod, the distance between the two lifting sleeves changes, so the common rod arranged therebetween needs to be designed to be telescopic.

[0021] Further, the pulling rod is arc-shaped, and the distance between the pulling rod and the external arc-extinguishing chamber is greater than 5 cm.

[0022] Through the technical scheme, the pulling rod needs to transmit the movement state of the movement sleeve to the common rod after the movement of the movement sleeve, and the pulling rod is arranged outside the external arc-extinguishing chamber, so in order to be more consistent with the shape of the external arc-extinguishing chamber and avoid collision and contact between the pulling rod and the external arc-extinguishing chamber, the pulling rod also needs to be arc-shaped.

[0023] Further, the fixing mechanism comprises a bottom rod, two top rods, an intermediate rod, and a movable sleeve, the bottom rod is fixedly connected to the side wall of the rotating ring, the two top rods are rotatably connected to the two sides of the bottom rod, the intermediate rod is fixedly arranged on the side wall of the end of the two top rods away from the bottom rod, the movable sleeve is movably arranged outside the intermediate rod, the side wall of the movable sleeve is fixedly provided with a flat pushing rod, the flat pushing rod is a telescopic rod, and the other end of the flat pushing rod is fixedly connected to the side wall of the common rod.

[0024] Through the technical scheme, when the common rod and the lifting sleeve move along the arc-shaped rod, the flat pushing rod will rise and fall together with the common rod due to the fixed connection effect between the common rod and the flat pushing rod, and then drive the movable sleeve and the intermediate rod to rise and fall together, and due to the rotatable connection effect between the top rod and the bottom rod, the top rod and the bottom rod will rotate slightly, so the bottom rod drives the rotating ring to rotate slightly, and then the gasket moves away from or contacts the external arc-extinguishing chamber.

[0025] Further, the inner diameter of the center hole is greater than the outer diameter of the pad, the height of the pad is greater than the height of the top plate, and the bottom plate abuts against the top of the external arc extinguishing chamber.

[0026] Through the above technical scheme, since the center hole is the key for the fixed clamping jaw to be sleeved outside the pad, the inner diameter of the center hole must be greater than the outer diameter of the pad, so as to facilitate the fixed clamping jaw to be sleeved from above to the terminal and the outside of the pad.

[0027] Further, the top rod and the bottom rod are both inclined, the flat push rod is horizontally arranged, and the distance between the top rod and the bottom rod and the external arc extinguishing chamber is greater than 5 cm.

[0028] Through the above technical scheme, the top rod and the bottom rod are in an inclined state in the initial state, that is, the pad has not contacted the external arc extinguishing chamber, so that the rotation amplitude between the top rod and the bottom rod is smaller when the flat push rod drives the top rod to move, so that the bottom rod does not excessively lift the rotating ring upward when driving the rotating ring to rotate, and the pressure between the rotating ring and the rotating groove is increased.

[0029] The beneficial effects of the present application are as follows:

[0030] (1) By arranging the top and bottom equalizing rings outside the external arc extinguishing chamber, the electric field of the external arc extinguishing chamber can be homogenized, and the top and bottom equalizing rings can homogenize the electric field from the top and bottom directions, and due to the presence of the fixed clamping jaw, the top equalizing ring can be fixed outside the terminal and the pad, and the arrangement of the fixing mechanism can relatively fix the bottom equalizing ring and the side wall of the external arc extinguishing chamber, so as to avoid the influence of vibration of the two equalizing rings caused by the opening and closing operation of the circuit breaker;

[0031] (2) By arranging the top equalizing ring in the shape of a circular ring and the bottom equalizing ring in the shape of a C, although a closed symmetrical circular ring has the same curvature radius in all directions and can form a perfect equipotential body, it can uniformly "push away" the electric power lines in all directions, and can provide a full-range, dead-angle-free uniform electric field shielding for the external vacuum arc extinguishing chamber, which is the best effect, but the non-closed ring verified by precise electric field simulation is also a completely feasible and common engineering solution, so the bottom equalizing ring in the shape of a C can also play a role in equalizing pressure, and since the combination of the top and bottom equalizing rings needs to be sleeved outside the external arc extinguishing chamber, in order to facilitate the sleeving of the two, the bottom equalizing ring needs to be arranged in an open shape, and the inner diameter of the top equalizing ring is smaller, because the outer diameter of the pad is smaller than the outer diameter of the external arc extinguishing chamber, so the top equalizing ring does not need to be arranged too large, and arranging it smaller can also facilitate the fixing effect between the fixed clamping jaw and the pad.

[0032] (3) The common rod and the flat push rod are arranged to be telescopic, when the lifting sleeves move along the arc-shaped rod, the distance between the two lifting sleeves changes, so the common rod arranged between the two lifting sleeves needs to be telescopic, due to the fixed connection effect between the common rod and the flat push rod, the flat push rod moves along the arc-shaped rod with the common rod, so the flat push rod also needs to be arranged to be telescopic;

[0033] (4) The pulling rod and the arc-shaped rod are arranged to be arc-shaped, the pulling rod needs to transmit the movement state of the movement sleeve to the common rod after the movement of the movement sleeve, and the pulling rod is arranged outside the external arc-extinguishing chamber, so as to be more consistent with the shape of the external arc-extinguishing chamber, and to avoid collision and contact between the pulling rod and the external arc-extinguishing chamber, the pulling rod also needs to be arranged to be arc-shaped, and the arc-shaped rod is fixedly arranged, but in order to be more consistent with the shape of the external arc-extinguishing chamber and reduce the size of the whole invention, the arc-shaped rod also needs to be arranged to be arc-shaped. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a first perspective view of the structure of the present application;

[0035] Figure 2 is a second perspective view of the structure of the present application;

[0036] Figure 3 is a structure connection diagram of the external arc-extinguishing chamber in the present application;

[0037] Figure 4 is Figure 3 is a local enlarged view of A in the present application;

[0038] Figure 5 is a structure connection diagram of the fixed clamping jaw in the present application;

[0039] Figure 6 is an exploded view of the fixed clamping jaw in the present application;

[0040] Figure 7 is a first perspective view of the structure of the top and bottom pressure equalizing rings in the present application;

[0041] Figure 8 is a second perspective view of the structure of the top and bottom pressure equalizing rings in the present application;

[0042] Figure 9 is Figure 8 is a local enlarged view of B in the present application;

[0043] Figure 10 is a third perspective view of the structure of the top and bottom pressure equalizing rings in the present application.

[0044] Reference signs: 1, circuit breaker body; 2, external arc extinguishing chamber; 3, terminal; 4, pad; 5, fixing hole; 6, arc-shaped rod; 7, top voltage-sharing ring; 8, connecting rod; 9, bottom voltage-sharing ring; 10, bottom plate; 11, first bevel gear; 12, second bevel gear; 13, toothed disc; 14, top plate; 15, fixing ring; 16, fixing claw; 17, center hole; 18, rotating hole; 19, bevel gear; 20, flat thread; 21, threaded rod; 22, moving sleeve; 23, limiting groove; 24, fixed insertion rod; 25, baffle; 26, inclined rod; 27, gasket; 28, rotating ring; 29, rotating groove; 30, lifting sleeve; 31, common rod; 32, pulling rod; 33, bottom rod; 34, top rod; 35, middle rod; 36, movable sleeve; 37, flat push rod; 38, driving groove. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0046] As shown in the drawings, Figure 1 Figure 4 The present embodiment provides a circuit breaker with external vacuum arc extinguishing chamber, which comprises a circuit breaker body 1, and a plurality of external arc extinguishing chambers 2 are arranged on the circuit breaker body 1. The top of each external arc extinguishing chamber 2 is fixedly provided with a terminal 3, and the side wall of the terminal 3 is fixedly provided with a pad 4. A fixing claw is movably arranged outside the pad 4. A plurality of fixing holes 5 are formed in the side wall of the pad 4, and the height of the fixing holes 5 is consistent with that of the fixing claw. A top voltage-sharing ring 7 and a bottom voltage-sharing ring 9 are arranged outside the external arc extinguishing chamber 2. The electric field of the external arc extinguishing chamber 2 can be homogenized. Due to the existence of the fixing claw and the fixing mechanism, the top voltage-sharing ring 7 and the bottom voltage-sharing ring 9 can be fixed on the side wall of the external arc extinguishing chamber 2, thereby avoiding the influence of vibration during the opening and closing operation of the circuit breaker.

[0047] From the content in the drawings, Figure 5 and Figure 6 It can be seen that the fixing claw comprises a bottom plate 10, a first bevel gear 11, two second bevel gears 12, a toothed disc 13, a top plate 14, three fixing rings 15 and a plurality of fixing claws 16. The bottom plate 10 and the top plate 14 are buckled together. The side wall of the bottom plate 10 and the side wall of the top plate 14 are both provided with a center hole 17. The terminal 3 passes through the center hole 17. The inner diameter of the center hole 17 is greater than the outer diameter of the pad 4. The height of the pad 4 is greater than the height of the top plate 14. The bottom plate 10 abuts against the top of the external arc extinguishing chamber 2. Since the center hole 17 is the key to whether the fixing claw can be arranged outside the pad 4, the inner diameter of the center hole 17 must be greater than the outer diameter of the pad 4, so as to facilitate the fixing claw to be arranged above the terminal 3 and outside the pad 4.​

[0048] The bottom plate 10 is provided with three rotating holes 18 in cooperation with the side wall of the top plate 14, three fixed rings 15 are arranged on the side wall of the bottom plate 10, the positions of the three fixed rings 15 correspond to the positions of the three rotating holes 18 respectively, the first bevel gear 11 and the two second bevel gears 12 are rotatably connected with the inner walls of the three fixed rings 15 respectively, the bottom of the toothed disc 13 is provided with a bevel gear 19, the top of the toothed disc 13 is provided with a flat thread 20, the first bevel gear 11 and the second bevel gear 12 are engaged with the bevel gear 19, the side wall of the first bevel gear 11 is provided with a driving groove 38, the side walls of the two second bevel gears 12 are fixedly provided with threaded rods 21, the threaded rods 21 are externally threadedly connected with a moving sleeve 22, the threaded rods 21 are fixedly provided with baffles 25 away from the second bevel gears 12, the outer diameter of the baffles 25 is larger than the outer diameter of the threaded rods 21.

[0049] The bottoms of the plurality of fixed clamping jaws 16 are engaged with the flat thread 20, the side wall of the top plate 14 is provided with a plurality of limiting grooves 23, the plurality of fixed clamping jaws 16 are slidably connected with the side walls of the plurality of limiting grooves 23 respectively, the side walls of each fixed clamping jaw 16 are fixedly provided with a fixed insertion rod 24, and each fixed insertion rod 24 is inserted into the fixed hole 5 respectively.

[0050] In combination with the contents in the Figure 7 - Figure 10 It can be known from the contents in the that the side wall of the fixed clamping jaw is fixedly provided with a plurality of arc-shaped rods 6, although the arc-shaped rods 6 are fixedly arranged, in order to be more consistent with the shape of the external arc-extinguishing chamber 2 and reduce the size of the whole invention, the arc-shaped rods 6 also need to be arranged in an arc shape, the other ends of the plurality of arc-shaped rods 6 are fixedly provided with a top equalizing ring 7, the bottom of the top equalizing ring 7 is fixedly provided with two connecting rods 8, and the bottoms of the two connecting rods 8 are fixedly provided with a bottom equalizing ring 9.

[0051] The top equalizing ring 7 is a circular ring, the bottom equalizing ring 9 is C-shaped, the inner diameter of the bottom equalizing ring 9 is larger than the inner diameter of the top equalizing ring 7, a closed symmetrical circular ring has the same curvature radius in all directions and can form a perfect equipotential body. It can uniformly "push away" the electric power line in all directions and provide an external vacuum arc-extinguishing chamber with a full-range, dead-angle-free uniform electric field shielding, and the effect is the best, but a non-closed ring verified by precise electric field simulation is also a completely feasible and common engineering solution. Since the combination of the top equalizing ring 7 and the bottom equalizing ring 9 needs to be arranged outside the external arc-extinguishing chamber 2, in order to facilitate the arrangement of the two, the bottom equalizing ring 9 needs to be arranged in an open shape, the top equalizing ring 7 can be fixed outside the cushion block 4 by the fixed clamping jaw, so it does not need to be arranged in an open shape, and the inner diameter of the top equalizing ring 7 is small because the outer diameter of the cushion block 4 needs to be smaller than the outer diameter of the external arc-extinguishing chamber 2, so the top equalizing ring 7 does not need to be arranged too large, and it can be arranged smaller to facilitate the fixing effect between the fixed clamping jaw and the cushion block 4.

[0052] Two abutments are movably installed on the side wall of the bottom equalizing ring 9. Both abutments abut against the side wall of the external arc-extinguishing chamber 2. The abutments include a diagonal rod 26, a washer 27, and a rotating ring 28. Two rotating grooves 29 are opened on the side wall of the bottom equalizing ring 9. The two rotating rings 28 are rotatably connected to the inner walls of the two rotating grooves 29 respectively. The diagonal rod 26 is fixedly connected to the side wall of the rotating ring 28. The other end of the diagonal rod 26 is fixedly connected to the side wall of the washer 27. The washer 27 abuts against the side wall of the external arc-extinguishing chamber 2. The washer 27 abuts against the side wall of the external arc-extinguishing chamber 2, so that the bottom equalizing ring 9 can be fixed to the outside of the external arc-extinguishing chamber 2. It can also be used to equalize the voltage outside the external arc-extinguishing chamber 2, thereby ensuring the safety of the external arc-extinguishing chamber 2. The setting of the rotating grooves 29 can ensure the movement trajectory of the rotating ring 28. The rotating ring 28 is confined in the rotating grooves 29 to ensure the fixing effect of the washer 27 and the external arc-extinguishing chamber 2.

[0053] Two arc-shaped rods 6 located on both sides of the threaded rod 21 are respectively equipped with lifting sleeves 30 on the outside of the movable sleeves 36. A common rod 31 is fixedly set between the two lifting sleeves 30. The common rod 31 is a telescopic rod. A pulling rod 32 is rotatably connected to the side wall of the common rod 31. The other end of the pulling rod 32 is rotatably connected to the side wall of the moving sleeve 22. The pulling rod 32 has an arc-shaped design. The distance between the pulling rod 32 and the external arc-extinguishing chamber 2 is greater than 5cm. The pulling rod 32 needs to transmit the movement state of the moving sleeve 22 to the common rod 31 after the moving sleeve 22 moves. Moreover, the pulling rod 32 is set outside the external arc-extinguishing chamber 2. Therefore, in order to better fit the shape of the external arc-extinguishing chamber 2 and avoid collision contact between the pulling rod 32 and the external arc-extinguishing chamber 2, the pulling rod 32 also needs to be set to an arc shape.

[0054] The fixing mechanism for driving the abutting rod is arranged between the bottom equalizing ring 9 and the top equalizing ring 7, and comprises a bottom rod 33, two top rods 34, an intermediate rod 35 and a movable sleeve 36. The bottom rod 33 is fixedly connected with the side wall of the rotating ring 28. The two top rods 34 are rotatably connected with the two sides of the bottom rod 33, respectively. The intermediate rod 35 is fixedly arranged on the side wall of the end of the two top rods 34 away from the bottom rod 33. The movable sleeve 36 is movably arranged outside the intermediate rod 35. The side wall of the movable sleeve 36 is fixedly provided with a horizontal push rod 37. The horizontal push rod 37 is a telescopic rod. The other end of the horizontal push rod 37 is fixedly connected with the side wall of the common rod 31. The top rod 34 and the bottom rod 33 are both arranged in an inclined manner. The horizontal push rod 37 is arranged in a horizontal manner. The distance between the top rod 34, the bottom rod 33 and the external arc extinguishing chamber 2 is also greater than 5 cm. The top rod 34 and the bottom rod 33 are in an inclined state in the initial state, i.e., the gasket 27 has not contacted the external arc extinguishing chamber 2. This is to make the rotation amplitude between the top rod 34 and the bottom rod 33 smaller when the horizontal push rod 37 drives the top rod 34 to move, so that the bottom rod 33 will not excessively lift the rotating ring 28 when driving the rotating ring 28 to rotate, thereby increasing the pressure between the rotating ring 28 and the rotating groove 29.

[0055] When the common rod 31 and the lifting sleeve 30 move along the arc-shaped rod 6, the horizontal push rod 37 will move up and down together with the common rod 31 due to the fixed connection effect between the common rod 31 and the horizontal push rod 37, thereby driving the movable sleeve 36 and the intermediate rod 35 to move up and down together. Due to the rotating connection effect between the top rod 34 and the bottom rod 33, small amplitude rotation will occur between the top rod 34 and the bottom rod 33, so that the bottom rod 33 drives the rotating ring 28 to rotate with small amplitude, thereby making the gasket 27 away from or contact the external arc extinguishing chamber 2.

[0056] The working principle of the embodiment is as follows. First, the top equalizing ring 7 and the bottom equalizing ring 9 are sleeved on the external arc extinguishing chamber 2. The C-shaped bottom equalizing ring 9 is first passed through the external arc extinguishing chamber 2, and then the top equalizing ring 7 is sleeved on the gasket 4 position outside the terminal 3 from above. Then a worker uses a tool with a specific shape to rotate the driving groove 38, so that the first bevel gear 11 drives the bevel gear 19 to rotate. Since the first bevel gear 11 and the second bevel gear 12 are both engaged with the bevel gear 19, when the bevel gear 19 drives the toothed disc 13 to rotate, the two second bevel gears 12 will also rotate, thereby driving the threaded rod 21 to rotate. Therefore, the movement sleeve 22 sleeved on the threaded rod 21 will move along the threaded rod 21.

[0057] When the toothed disc 13 rotates, the flat thread 20 is engaged with the fixed clamping jaw 16, and the fixed clamping jaw 16 is limited in the limiting groove 23 and can only move along the limiting groove 23, so that the several fixed clamping jaws 16 make the fixed inserting rod 24 inserted into the fixed hole 5, and then the whole fixed clamping jaw is fixed outside the cushion block 4;

[0058] When the movement sleeve 22 moves along the threaded rod 21, the pulling rod 32 connected with the side wall of the movement sleeve 22 rotates drives the common rod 31 and the lifting sleeve 30 to move along the arc-shaped rod 6, due to the fixed connection effect between the common rod 31 and the flat pushing rod 37, the flat pushing rod 37 rises along with the common rod 31, and then drives the movable sleeve 36 and the intermediate rod 35 to rise, due to the rotating connection effect between the top rod 34 and the bottom rod 33, a small rotation is generated between the top rod 34 and the bottom rod 33, so that the bottom rod 33 drives the rotating ring 28 to rotate slightly, and then the gasket 27 abuts against the external arc-extinguishing chamber 2, and then the bottom uniform pressure ring 9 is fixed outside the external arc-extinguishing chamber 2.

[0059] The above merely describes the preferred embodiment of the present application, but is not used to limit the protection scope of the present application.

Claims

1. A circuit breaker with external vacuum interrupter chambers, comprising a circuit breaker body (1), characterized in that: The circuit breaker body (1) is provided with several external arc extinguishing chambers (2), the top of the external arc extinguishing chamber (2) is fixedly provided with a terminal (3), the side wall of the terminal (3) is fixedly provided with a cushion block (4), the external arc extinguishing chamber (2) is provided with a fixed jaw, the side wall of the cushion block (4) is provided with several fixed holes (5), and the height of the fixed jaw is consistent with that of the fixed hole (5); The side wall of the fixed jaw is fixedly provided with several arc-shaped rods (6), the other end of the arc-shaped rod (6) is fixedly provided with a top equalizing ring (7), the bottom of the top equalizing ring (7) is fixedly provided with two connecting rods (8), the bottom of the connecting rod (8) is fixedly provided with a bottom equalizing ring (9), and the top equalizing ring (7) and the bottom equalizing ring (9) are both made of conductive metal material; The fixed jaw comprises a bottom plate (10), a first bevel gear (11), two second bevel gears (12), a toothed disc (13), a top plate (14), three fixed rings (15) and several fixed clamping jaws (16), the bottom plate (10) and the top plate (14) are buckled together, the side wall of the bottom plate (10) and the top plate (14) is provided with a center hole (17), the terminal (3) passes through the center hole (17), the side wall of the bottom plate (10) and the top plate (14) is provided with three rotating holes (18), the three fixed rings (15) are arranged on the side wall of the bottom plate (10), the positions of the three fixed rings (15) correspond to the positions of the three rotating holes (18), the first bevel gear (11) and the two second bevel gears (12) are rotatably connected with the inner walls of the three fixed rings (15), the toothed disc (13) is provided with a bevel gear (19) at the bottom, the toothed disc (13) is provided with a flat thread (20) at the top, the first bevel gear (11) and the second bevel gear (12) are engaged with the bevel gear (19), the side wall of the first bevel gear (11) is provided with a driving groove (38), the side wall of the second bevel gear (12) is fixedly provided with a threaded rod (21), the threaded rod (21) is externally threadedly connected with a moving sleeve (22), the bottom of the fixed clamping jaw (16) is engaged with the flat thread (20), the side wall of the top plate (14) is provided with several limiting grooves (23), the fixed clamping jaw (16) is slidably connected with the side wall of the limiting groove (23), the side wall of the fixed clamping jaw (16) is fixedly provided with a fixed insertion rod (24), and the fixed insertion rod (24) is inserted into the fixed hole (5). Two abutting rods are movably arranged on the sidewall of the bottom equalizing ring (9), and the two abutting rods are in abutment with the sidewall of the external arc-extinguishing chamber (2). The abutting rod comprises an inclined rod (26), a gasket (27) and a rotating ring (28). Two rotating grooves (29) are formed on the sidewall of the bottom equalizing ring (9). The two rotating rings (28) are rotatably connected with the inner walls of the two rotating grooves (29) respectively. The inclined rod (26) is fixedly connected with the sidewall of the rotating ring (28). The other end of the inclined rod (26) is fixedly connected with the sidewall of the gasket (27). The gasket (27) is in abutment with the sidewall of the external arc-extinguishing chamber (2). A fixing mechanism for driving the abutting rod is arranged between the bottom equalizing ring (9) and the top equalizing ring (7). The fixing mechanism comprises a bottom rod (33), two top rods (34), an intermediate rod (35) and a movable sleeve (36). The bottom rod (33) is fixedly connected with the sidewall of the rotating ring (28). The two top rods (34) are rotatably connected with the two sides of the bottom rod (33) respectively. The intermediate rod (35) is fixedly arranged on the sidewall of the end of the two top rods (34) away from the bottom rod (33). The movable sleeve (36) is movably arranged outside the intermediate rod (35). The sidewall of the movable sleeve (36) is fixedly provided with a flat push rod (37). The flat push rod (37) is a telescopic rod. The other end of the flat push rod (37) is fixedly connected with the sidewall of the common rod (31).

2. The circuit breaker of claim 1, wherein, The top equalizing ring (7) is a circular ring. The bottom equalizing ring (9) is C-shaped. The inner diameter of the bottom equalizing ring (9) is greater than the inner diameter of the top equalizing ring (7).

3. The circuit breaker of claim 1, wherein, The movable fixing of the baffle (25) is arranged on the side of the threaded rod (21) away from the second bevel gear (12). The outer diameter of the baffle (25) is greater than the outer diameter of the threaded rod (21).

4. The circuit breaker of claim 1, wherein, The outer part of the two arc-shaped rods (6) on the two sides of the threaded rod (21) is respectively provided with a lifting sleeve (30). The two lifting sleeves (30) are fixedly provided with a common rod (31) therebetween. The common rod (31) is a telescopic rod. The sidewall of the common rod (31) is rotatably connected with a pulling rod (32). The other end of the pulling rod (32) is rotatably connected with the sidewall of the moving sleeve (22).

5. The circuit breaker of claim 4, wherein, The pulling rod (32) is arc-shaped. The distance between the pulling rod (32) and the external arc-extinguishing chamber (2) is greater than 5 cm.

6. The circuit breaker of claim 1, wherein, The top rod (34) and the bottom rod (33) are both arranged obliquely. The flat push rod (37) is arranged horizontally. The distance between the top rod (34), the bottom rod (33) and the external arc-extinguishing chamber (2) is greater than 5 cm.

7. The circuit breaker of claim 1, wherein, The inner diameter of the central hole (17) is greater than the outer diameter of the cushion block (4). The height of the cushion block (4) is greater than the height of the top plate (14). The bottom plate (10) is in abutment with the top of the external arc-extinguishing chamber (2).

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