Overload tripping device of high-voltage vacuum circuit breaker
By introducing auxiliary rods and locking components into the high-voltage vacuum circuit breaker and combining with the synchronous driving mechanism, the trip delay problem caused by the outward movement of the moving contact lever is solved, and the effect of overload tripping is achieved under small force.
Patent Information
- Application Number
- CN202510010820.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-04-11
AI Technical Summary
In the case of overload, high-voltage vacuum circuit breakers may delay tripping due to insufficient driving force, mainly because the outward movement of the moving contact lever increases the internal space of the shield cover, and requires greater driving force to trip.
A high-voltage vacuum circuit breaker overload trip device is designed, and auxiliary rods and locking components are used to enhance the movement stability of the moving contact lever, and the vertical movement adjustment of the moving contact lever is realized through a synchronous driving mechanism. The auxiliary rod is made of a non-conductive material, sealed and slid through the second plug body, and is positioned and locked by a locking assembly.
By introducing auxiliary rods and locking components, the movement stability of the moving contact lever is improved, and external air pressure is used to help the auxiliary rod move inward, thereby reducing the force required for the moving contact lever to move, achieving overload tripping with small force.
Smart Images
Figure CN119811923A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of circuit breakers, in particular to an overload tripping device for a high-voltage vacuum circuit breaker. Background Art
[0002] High voltage vacuum circuit breaker is a key device used to protect power systems and equipment from overload or fault current. It has the characteristics of fast current cut-off, high reliability, good durability and environmental friendliness, so it is widely used in power transmission and distribution networks.
[0003] Overload means that the current in the circuit exceeds the rated value, which may cause overheating or even damage to wires, relays and other equipment. In order to protect power equipment from overload, a suitable tripping device is required to quickly cut off the current.
[0004] In the current high-voltage vacuum circuit breakers, since the interior of the shielding cover is a vacuum environment, a large driving force is required under the external air pressure to pull the moving contact rod outward. In addition, the outward movement of the moving contact rod will cause the internal space of the shielding cover to increase, and thus a larger driving force is required to pull the moving contact rod outward. Therefore, in some cases, there may be phenomena such as delayed tripping due to insufficient driving force.
[0005] Therefore, it is necessary to provide a high-voltage vacuum circuit breaker overload tripping device to solve the problems raised in the above background technology. Summary of the invention
[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-voltage vacuum circuit breaker overload tripping device, comprising a shielding cover, a second plug body is fixed on the top of the shielding cover, a first plug body is fixed on the bottom of the shielding cover, a moving contact rod is slidably penetrated in the first plug body, a fixed contact rod is fixedly penetrated in the second plug body, a connecting disk is also fixed on the moving contact rod, the connecting disk is made of non-conductive material, at least one auxiliary rod is fixed on the connecting disk, the auxiliary rod is made of non-conductive material, the auxiliary rod seals and slides through the second plug body, and the moving contact rod is driven by a synchronous drive mechanism to perform vertical movement adjustment, thereby achieving overload tripping.
[0007] Further, preferably, the number of the auxiliary rods is n (n is an integer greater than 1), and the diameter of the auxiliary rod is greater than or equal to 1 / n of the diameter of the moving contact rod.
[0008] Further, preferably, the plurality of auxiliary rods are distributed in a circumferentially equidistant array.
[0009] Further, as a preference, a first bellows is provided between the moving contact rod and the first plug body, and a second bellows is provided between the auxiliary rod and the second plug body.
[0010] Further, as a preference, a first frame is fixed to the upper end of the shielding cover, a second frame is fixed to the lower end of the shielding cover, and the first frame and the second frame are fixed to the base frame;
[0011] The synchronous drive mechanism includes a crank arm, a rack and a rotating shaft, wherein the rotating shaft is rotatably arranged on the base frame and has power, a gear is fixed on the rotating shaft, the gear is meshed with the rack, the rack is horizontally slidably arranged on the base frame, the rack is also hinged to the crank arm, the middle part of the crank arm is hinged to the second frame, the end of the crank arm away from the rack is hinged to the outer cylinder, and the outer cylinder is fixed to the moving contact rod.
[0012] Further, as a preference, the auxiliary rod is also positioned and locked by a locking assembly, the locking assembly comprising a fixed ring, a swivel and an outer ring, wherein the fixed ring is fixed on the first frame, a resettable radial sliding member in the fixed ring is provided with a plurality of sliding rods distributed in a circumferential array, a first wedge block is fixed to one end of the sliding rod away from the auxiliary rod, a swivel is provided for external rotation of the fixed ring, a second wedge block corresponding to the first wedge block is fixed on the swivel, and the external transmission of the swivel is connected to the outer ring.
[0013] Further, as a preferred embodiment, the outer ring is connected to the synchronous wheel by a synchronous belt, the synchronous wheel is coaxially sleeved on the outside of the rotating shaft, two shaft levers are symmetrically fixed on the rotating shaft, and two synchronous levers are symmetrically fixed on the inner side of the synchronous wheel;
[0014] The middle part of the rack is divided into two sections, and an elastic member is connected between the two sections.
[0015] Further, preferably, the elastic member is any one or more of an elastic plate, an elastic pad, and an elastic spring.
[0016] Compared with the prior art, the present invention provides a high-voltage vacuum circuit breaker overload tripping device, which has the following beneficial effects:
[0017] 1. In the embodiment of the present invention, an auxiliary rod is introduced. On the one hand, the auxiliary rod can improve the stability of the movement of the moving contact rod. On the other hand, the auxiliary rod can solve the problem of the increase in the internal space of the shielding cover caused by the outward movement of the moving contact rod. The external air pressure can also provide pressure for the inward movement of the auxiliary rod, thereby compensating for the force required for the movement of the moving contact rod, so that only a small force is required to move the moving contact rod and realize overload tripping;
[0018] 2. In the embodiment of the present invention, the auxiliary rod is positioned by the locking assembly, which also makes the moving contact rod more stable, and the movement of the locking assembly and the moving contact rod can be driven by the synchronous driving mechanism, and the synchronization between the two is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a structural schematic diagram of a high-voltage vacuum circuit breaker overload tripping device;
[0020] Figure 2 It is a structural schematic diagram of a locking assembly in an overload tripping device of a high-voltage vacuum circuit breaker;
[0021] Figure 3 A schematic diagram of the structure of the rotating shaft and synchronous wheel in a high-voltage vacuum circuit breaker overload trip device Figure 1 ;
[0022] Figure 4 A schematic diagram of the structure of the rotating shaft and synchronous wheel in a high-voltage vacuum circuit breaker overload trip device Figure 2 ; In the figure: 1. first frame; 2. second frame; 3. shielding cover; 4. first plug body; 5. second plug body; 6. moving contact rod; 7. fixed contact rod; 8. auxiliary rod; 9. locking assembly; 10. connecting plate; 11. crank arm; 12. rack; 13. gear; 14. rotating shaft; 141. shaft lever; 15. synchronous wheel; 151. synchronous lever; 16. synchronous belt; 17. base frame; 18. elastic member; 91. fixing ring; 92. sliding rod; 93. first wedge block; 94. rotating ring; 95. second wedge block; 96. outer ring. DETAILED DESCRIPTION
[0023] Please refer to Figure 1-4 In an embodiment of the present invention, a high-voltage vacuum circuit breaker overload tripping device is provided, including a shielding cover 3, a second plug body 5 is fixed on the top of the shielding cover 3, a first plug body 4 is fixed on the bottom of the shielding cover 3, a moving contact rod 6 is slidably penetrated in the first plug body 4, and a fixed contact rod 7 is fixedly penetrated in the second plug body 5, characterized in that: a connecting disk 10 is also fixed on the moving contact rod 6, the connecting disk 10 is made of non-conductive material, at least one auxiliary rod 8 is fixed on the connecting disk 10, the auxiliary rod 8 is made of non-conductive material, the auxiliary rod 8 seals and slides through the second plug body 5, and the moving contact rod 6 is driven by a synchronous drive mechanism to perform vertical movement adjustment, thereby realizing overload tripping.
[0024] In the embodiment of the present invention, an auxiliary rod 8 is introduced. On the one hand, the auxiliary rod 8 can improve the stability of the movement of the moving contact rod 8. On the other hand, since the interior of the shielding cover is a vacuum environment, a larger driving force is required under the external air pressure to pull the moving contact rod 6 outward. In addition, the outward movement of the moving contact rod 6 will cause the internal space of the shielding cover to increase, and thus a larger driving force is required to pull the moving contact rod 6 outward. The moving contact rod 8 can solve the problem of increased internal space of the shielding cover caused by the outward movement of the moving contact rod 6, and the external air pressure will also provide pressure for the inward movement of the moving contact rod 8, thereby compensating for the force required for the movement of the moving contact rod 6, so that only a very small force is required to move the moving contact rod 6 and thus achieve overload tripping.
[0025] From a microscopic perspective, gas is composed of a large number of microscopic particles (such as molecules and atoms), which move at high speeds and constantly collide with each other. These collisions generate impact forces between gas molecules and between gas molecules and the container walls.
[0026] Air pressure actually refers to the force exerted by gas molecules on the surface of the container per unit area. When gas molecules hit the surface of the container, they will generate an impact force perpendicular to the surface, and the sum of the impact forces per unit area forms the pressure of the gas, that is, air pressure;
[0027] Under vacuum conditions, the number of gas molecules inside the shielding cover tends to zero, while the gas molecules outside the shielding cover will not change. In this case, the pressure outside the shielding cover is greater than the pressure inside the shielding cover, which requires a larger driving force under the external air pressure to pull the moving contact rod 6 outward, and the outward movement of the moving contact rod 6 will cause the internal space of the shielding cover to increase, which further makes the pressure inside the shielding cover smaller. In this embodiment, when the moving contact rod is pulled outside the shielding cover, the auxiliary rod moves into the shielding cover synchronously. Therefore, the moving contact rod 8 can solve the phenomenon of increased internal space of the shielding cover caused by the outward movement of the moving contact rod 6, and the external air pressure will also provide pressure for the inward movement of the moving contact rod 8, thereby compensating for the force required for the movement of the moving contact rod 6, so that only a very small force is required to move the moving contact rod 6 and achieve overload tripping.
[0028] Of course, the size of the air pressure also depends on many factors, including the temperature and volume of the gas, which are not considered here.
[0029] Of course, the device is also equipped with a monitoring mechanism to monitor the current and voltage in the circuit to determine whether it is overloaded, and then control the synchronous drive mechanism, which will not be repeated here.
[0030] As a preferred embodiment, the number of the auxiliary rods 8 is n (n is an integer greater than 1), and the diameter of the auxiliary rod 8 is greater than or equal to 1 / n of the diameter of the moving contact rod 6 .
[0031] The advantage of such a configuration is that the portion of the space inside the shielding cover 3 that is increased by pulling the movable contact rod 6 outward from the shielding cover 3 is less than or equal to the portion of the space inside the shielding cover 3 that is reduced by pushing the auxiliary rod 8 into the shielding cover 3 .
[0032] As a preferred embodiment, the plurality of auxiliary rods 8 are distributed in a circumferentially equidistant array.
[0033] As a preferred embodiment, a first bellows is provided between the moving contact rod 6 and the first plug body 4 , and a second bellows is provided between the auxiliary rod 8 and the second plug body 5 .
[0034] In this embodiment, a first frame 1 is fixed to the upper end of the shielding cover 3, and a second frame 2 is fixed to the lower end of the shielding cover 3. The first frame 1 and the second frame 2 are fixed to the base frame 17;
[0035] The synchronous drive mechanism includes a crank arm 11, a rack 12 and a rotating shaft 14, wherein the rotating shaft 14 is rotatably arranged on the base frame 17 and has power, a gear 13 is fixed on the rotating shaft 14, the gear 13 is meshed with the rack 12, the rack 12 is horizontally slidably arranged on the base frame 17, the rack 12 is also hinged to the crank arm 11, the middle part of the crank arm 11 is hinged to the second frame 2, the end of the crank arm 11 away from the rack 12 is hinged to the outer cylinder, and the outer cylinder is fixed to the moving contact rod 6.
[0036] In practice, when the driving shaft 14 rotates, the gear 13 can drive the rack 12 to move, and the rack 12 can deflect the crank arm 11 when it moves, thereby causing the outer cylinder to move vertically, and then causing the movable contact rod 6 to move vertically.
[0037] In this embodiment, the auxiliary rod 8 is also positioned and locked by a locking assembly 9, and the locking assembly 9 includes a fixed ring 91, a swivel ring 94 and an outer ring 96, wherein the fixed ring 91 is fixed on the first frame, and a plurality of slide bars 92 distributed in a circumferential array are arranged in a resettable radial sliding manner in the fixed ring 91, and a first wedge block 93 is fixed to the end of the slide bar 92 away from the auxiliary rod 8, and a swivel ring 94 is arranged for external rotation of the fixed ring 91, and a second wedge block 95 corresponding to the first wedge block 93 is fixed on the swivel ring 94, and the external transmission of the swivel ring 94 is connected to the outer ring 96.
[0038] Then, in implementation, when the outer ring 96 rotates clockwise, the rotating ring 94 rotates clockwise accordingly, and the first wedge block and the second wedge block are locked with each other, so that the sliding rod 92 is radially slid and locked onto the auxiliary rod 8, otherwise, the auxiliary rod 8 is released from being locked;
[0039] As a preferred embodiment, a return spring is further provided between the slide bar 92 and the fixing ring 91 for movement and return of the slide bar 92 .
[0040] In this embodiment, the synchronous drive mechanism further includes a synchronous belt 16 and a synchronous wheel 15, wherein the outer ring 96 is connected to the synchronous wheel 15 by a synchronous belt 16, the synchronous wheel 15 is coaxially sleeved on the outside of the rotating shaft 14 with a gap, two shaft levers 141 are symmetrically fixed on the rotating shaft 14, and two synchronous levers 151 are symmetrically fixed on the inner side of the synchronous wheel 15;
[0041] The middle portion of the rack 12 is divided into two sections, and an elastic member 18 is connected between the two sections.
[0042] It is important to explain that, in implementation, Figure 3 At this time, the locking assembly 9 is in a locking state for the auxiliary rod 8. When the locking assembly 9 needs to release the locking of the auxiliary rod 8, the rotating shaft 14 rotates counterclockwise until the lower shaft lever 141 contacts the upper synchronous lever 151 and pushes them to rotate synchronously for a certain angle (such as Figure 4 ), the locking assembly releases the locking of the auxiliary rod 8. At this time, the elastic member has been fully stretched, so the elastic member contracts rapidly to realize the downward driving of the moving contact rod. When resetting, the rotating shaft 14 rotates clockwise, thereby first driving the moving contact rod to reset. During this process, the shaft lever 141 rotates clockwise accordingly, and then the upper shaft lever contacts the lower synchronous lever and pushes them to rotate synchronously by a certain angle, and then the locking assembly realizes the locking of the auxiliary rod 8.
[0043] In simple terms, the purpose of the shaft lever, synchronization lever and elastic member configured in this embodiment is: when the synchronous drive mechanism is working, first, it can first drive the locking assembly 9 to release the lock of the auxiliary rod 8, and then quickly drive the moving contact rod 6 to move outward; second, it can first drive the moving contact rod to reset, and then drive the locking assembly 9 to lock the auxiliary rod 8.
[0044] In this embodiment, the elastic member is any one or more of an elastic plate, an elastic pad, and an elastic spring. The elastic expansion length of the elastic member is greater than or equal to the length of movement of the left rack of the two racks 12 driven by the gear 13 when the rotation shaft 14 is used to rotate and drive the locking assembly 9 to release the locking of the auxiliary rod 8.
[0045] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A high-voltage vacuum circuit breaker overload tripping device, comprising a shielding cover (3), a second plug body (5) being fixed on the top of the shielding cover (3), a first plug body (4) being fixed on the bottom of the shielding cover (3), a moving contact rod (6) being slidably penetrated in the first plug body (4), and a fixed contact rod (7) being fixedly penetrated in the second plug body (5), characterized in that: The movable contact rod (6) is also fixed with a connection plate (10), the connection plate (10) is made of a non-conductive material, at least one auxiliary rod (8) is fixed on the connection plate (10), the auxiliary rod (8) is made of a non-conductive material, the auxiliary rod (8) seals and slides through the second plug body (5), and the movable contact rod (6) is driven by a synchronous drive mechanism to perform vertical movement adjustment, thereby achieving overload tripping.
2. A high voltage vacuum circuit breaker overload tripping device according to claim 1, characterized in that: The number of the auxiliary rods (8) is n (n is an integer greater than 1), and the diameter of the auxiliary rod (8) is greater than or equal to 1 / n of the diameter of the moving contact rod (6).
3. A high voltage vacuum circuit breaker overload tripping device according to claim 2, characterized in that: The plurality of auxiliary rods (8) are distributed in a circumferentially equidistant array.
4. A high voltage vacuum circuit breaker overload tripping device according to claim 1, characterized in that: A first bellows is provided between the moving contact rod (6) and the first plug body (4), and a second bellows is provided between the auxiliary rod (8) and the second plug body (5).
5. A high voltage vacuum circuit breaker overload tripping device according to claim 1, characterized in that: A first frame (1) is fixed to the upper end of the shielding cover (3), a second frame (2) is fixed to the lower end of the shielding cover (3), and the first frame (1) and the second frame (2) are fixed to a base frame (17); The synchronous drive mechanism comprises a crank arm (11), a rack (12) and a rotating shaft (14), wherein the rotating shaft (14) is rotatably arranged on the base frame (17) and has power, a gear (13) is fixed on the rotating shaft (14), the gear (13) is meshed with the rack (12), the rack (12) is horizontally slidably arranged on the base frame (17), the rack (12) is also hinged to the crank arm (11), the middle part of the crank arm (11) is hinged to the second frame (2), and one end of the crank arm (11) away from the rack (12) is hinged to an outer cylinder, and the outer cylinder is fixed to the moving contact rod (6).
6. A high voltage vacuum circuit breaker overload tripping device according to claim 5, characterized in that: The auxiliary rod (8) is also positioned and locked by a locking assembly (9), and the locking assembly (9) includes a fixed ring (91), a rotating ring (94) and an outer ring (96), wherein the fixed ring (91) is fixed on the first frame, and a plurality of slide bars (92) distributed in a circumferential array are arranged through the resettable radial sliding in the fixed ring (91), and a first wedge block (93) is fixed at one end of the slide bar (92) away from the auxiliary rod (8), and a rotating ring (94) is arranged on the outside of the fixed ring (91), and a second wedge block (95) corresponding to the first wedge block (93) is fixed on the rotating ring (94), and the external transmission of the rotating ring (94) is connected to the outer ring (96).
7. A high voltage vacuum circuit breaker overload tripping device according to claim 6, characterized in that: The synchronous drive mechanism further comprises a synchronous belt (16) and a synchronous wheel (15); the outer ring (96) is connected to the synchronous wheel (15) by means of the synchronous belt (16); the synchronous wheel (15) is coaxially sleeved on the outside of the rotating shaft (14) with a clearance; two shaft shifting rods (141) are symmetrically fixed on the rotating shaft (14); and two synchronous shifting rods (151) are symmetrically fixed on the inner side of the synchronous wheel (15); The middle part of the rack (12) is divided into two sections, and an elastic member (18) is connected between the two sections.
8. A high voltage vacuum circuit breaker overload tripping device according to claim 7, characterized in that: The elastic member (18) is any one or more of an elastic plate, an elastic pad, and an elastic spring.