CN117373865A

CN117373865A - Contact blade, contact structure, vacuum arc-extinguishing chamber and vacuum circuit breaker with contact blade

Info

Publication number: CN117373865A
Application number: CN202311358445.2A
Authority: CN
Inventors: 张友鹏; 马朝阳; 李永林; 赵晓民; 钟建英; 毕迎华; 孙广雷; 李旭旭; 刘庆; 刘文魁; 庞素敏; 关昕; 张航; 李潇; 王浩源; 刘心雨; 李一林; 胡锦汐; 林鑫; 谭传亮
Original assignee: Pinggao Group Co Ltd
Current assignee: Pinggao Group Co Ltd
Priority date: 2023-10-19
Filing date: 2023-10-19
Publication date: 2024-01-09

Abstract

The invention belongs to the field of high-voltage or high-current switches with arc extinguishing or arc preventing devices, and particularly relates to a contact blade, a contact structure where the contact blade is positioned, a vacuum arc extinguishing chamber and a vacuum circuit breaker. In order to solve the technical problems that in the prior art, in order to adapt to a larger transmission grade, a groove is formed in a contact blade, and the rated mechanical life of a vacuum circuit breaker is lower, the invention provides a contact blade. The invention also provides a contact structure, a vacuum arc-extinguishing chamber and a vacuum circuit breaker comprising the contact blade. Through addding non-ferromagnetic reinforcement, can strengthen the structural strength of contact piece, simultaneously, the permeability of non-ferromagnetic reinforcement is less, can reduce the intensity of induction magnetic field effectively to the diversion increases accuse arc magnetic field, with the adaptation bigger transmission grade.

Description

Contact blade, contact structure, vacuum arc-extinguishing chamber and vacuum circuit breaker with contact blade

Technical Field

The invention belongs to the field of high-voltage or high-current switches with arc extinguishing or arc preventing devices, and particularly relates to a contact blade, a contact structure where the contact blade is positioned, a vacuum arc extinguishing chamber and a vacuum circuit breaker.

Background

The contact structure of the current vacuum circuit breaker is usually a longitudinal magnetic contact, and can be particularly subdivided into various forms such as cup-shaped, coil-shaped, horseshoe-shaped and the like, and the coil-shaped longitudinal magnetic contact and the horseshoe-shaped longitudinal magnetic contact are most commonly used in the middle-high voltage field at present. The longitudinal magnetic contact has the functions of: the constraint effect of a strong longitudinal magnetic field on arc plasma is utilized to force the arc to be kept in a diffusion state, and compared with the arc in a concentrated state, the arc kept in the diffusion state can disperse the contact point of the arc and a contact structure, so that the ablation degree of the root of the high-energy arc on a local contact is reduced, and the contact structure can be suitable for the break-up of the arc with larger current.

The contact blade is used as a core part of the contact structure of the vacuum arc-extinguishing chamber, and the normal current-through capacity and fault current breaking performance of the whole contact structure and the arc-extinguishing chamber are determined to a great extent. Because the vacuum circuit breaker often operates under alternating current working condition, so under alternating current's effect, can produce induced magnetic field and induced current in the inside metal part of explosion chamber, induced current exists at the contact piece in the form of vortex to lead to the heating of contact piece department seriously, the heat that the contact piece department produced can influence whole vacuum circuit breaker holistic dynamic heat balance and temperature rise margin.

In order to avoid the problem that part of parts fail in advance due to overhigh temperature when the vacuum circuit breaker operates for a long time, enough temperature rise margin needs to be reserved in designing the vacuum circuit breaker, so that the current at the contact blade needs to be controlled, and the problem is mostly solved by improving the heat dissipation mode of the vacuum circuit breaker in the prior art; therefore, this problem is not a core problem that has to be overcome to limit the application of vacuum circuit breakers to larger transmission levels.

It is important to note that the existence of the induced magnetic field also weakens the arc control magnetic field generated by the excitation structure of the longitudinal magnetic contact, so that the diffusion degree of the arc is weakened to increase the ablation speed of the high-energy arc on the local contact, the power transmission grade of the vacuum circuit breaker must be reduced to ensure that the contact is not burnt out, the overall breaking performance of the vacuum circuit breaker is affected, and the problem is the core problem that needs to be overcome when the vacuum circuit breaker is applied to larger power transmission grade.

In the prior art, in order to give full play to the performance of the contact structure, a slot is formed in the contact blade to intercept an eddy current loop on the contact blade, so that the heating value of the contact blade is reduced, the induction magnetic field of the contact blade is weakened, the integral temperature rise margin of the vacuum circuit breaker is further ensured to adapt to a larger power transmission grade, and meanwhile, the direction change is increased to control the arc magnetic field, so that the ablation degree of an arc on the contact blade is reduced to adapt to the larger power transmission grade.

The application publication number is CN 116313628A, the Chinese patent application with the application publication date being 2023.06.23 discloses a contact structure of a vacuum arc extinguishing chamber, which comprises a moving contact, a fixed contact and an excitation contact (namely an excitation structure) sleeved on the outer peripheral surface of the moving contact, wherein flat contact blades (namely contact blades) are arranged on the end surfaces of the moving contact and the fixed contact, through arranging inclined slots on the moving contact, the fixed contact and the excitation contact, and through slots communicated with the inclined slots (namely slots on the contact blade body of the contact blade) are arranged on the contact blade of the fixed contact and the moving contact, thereby cutting off vortex loops on the moving contact, the fixed contact and the excitation contact, reducing the heating value of the contact and reducing the induction magnetic field of the contact.

After the vacuum arc-extinguishing chamber contact structure is applied to a vacuum circuit breaker, the contact blades need to keep a certain closing speed in the closing process so as to avoid the occurrence of cold welding of the contacts due to breakdown discharge in the approaching process of the moving contact and the fixed contact, and therefore, serious collision can occur between the moving contact and the fixed contact. The rated mechanical life of the vacuum circuit breaker is generally about 10000 times, the mechanical strength requirement on the contact structure is higher, and the stress of the contact blade after the groove is opened is easily concentrated at the groove root part, so that the groove root part becomes a weak part, and the groove root part of the contact blade is easily damaged during closing, thereby reducing the mechanical life of the vacuum circuit breaker. When the contact blades are damaged, the breaking performance of the vacuum circuit breaker is lost, and the breaking failure of the vacuum circuit breaker is caused, so that the grooving on the contact blades reduces the rated mechanical life of the vacuum circuit breaker in order to adapt to a larger transmission grade.

Disclosure of Invention

The invention aims to provide a contact blade, a contact structure, a vacuum arc-extinguishing chamber and a vacuum circuit breaker with the contact blade, and aims to solve the technical problem that in the prior art, in order to adapt to a larger transmission grade, the contact blade is grooved, so that the rated mechanical life of the vacuum circuit breaker is lower.

In order to achieve the above purpose, the technical scheme of the contact blade provided by the invention is as follows:

the contact blade comprises a contact blade body, a through groove is formed in the contact blade body, a reinforcing piece for increasing the strength of the contact blade is arranged at a position, corresponding to the through groove, of the contact blade body, and the reinforcing piece is a non-ferromagnetic reinforcing piece.

The beneficial effects are as follows: the invention is an improved invention. By additionally arranging the reinforcing piece at the grooving part of the contact blade body, the structural strength of the contact blade can be enhanced, the service life of the contact blade can be prolonged, and the rated mechanical service life of the vacuum circuit breaker can be further prolonged. Meanwhile, as the reinforcing piece is a nonferromagnetic reinforcing piece, namely the magnetic conductivity of the reinforcing piece is smaller, the intensity of an induced magnetic field can be effectively reduced, so that the direction change is increased, the arc control magnetic field is increased, and the ablation speed of an arc to a contact blade is reduced to adapt to a larger power transmission grade.

Still further, the non-ferromagnetic reinforcement is disposed in the through-slot, and the through-slot is completely filled with the non-ferromagnetic reinforcement.

The beneficial effects are as follows: the reinforcing piece is filled in the through groove, and the reinforcing piece and the contact blade body form a side wall stop fit of the through groove, so that the structural strength of the contact blade is increased, and the service life of the contact blade is prolonged. Meanwhile, the induction current on the contact blade is cut off by the non-ferromagnetic reinforcing piece, so that the heat effect caused by the induction current can be reduced, and the heat generated by the induction current is reduced.

Still further, the contact blade body has a collision surface for contact collision with another contact blade, the non-ferromagnetic reinforcement is provided on a side of the contact blade body facing away from the collision surface, and the non-ferromagnetic reinforcement can completely cover the through slot.

The beneficial effects are as follows: the reinforcing piece is arranged on the opposite side of one end of the contact blade for collision, on one hand, the reinforcing piece is arranged on one end of the contact blade body for collision, so that interference of the reinforcing piece to collision and diversion of the contact blade can be avoided; on the other hand, the strength of the contact blade body can be enhanced, and the service life of the contact blade can be prolonged. Meanwhile, the induced current is cut off by the through groove, so that the heat effect caused by the induced current is reduced, and the heat generated by the induced current is reduced.

Still further, the non-ferromagnetic stiffener is a conductor.

The beneficial effects are as follows: the non-ferromagnetic reinforcing piece is arranged to be a conductor, and compared with the non-conductor reinforcing piece, the non-ferromagnetic reinforcing piece has larger heat conductivity when being a conductor, so that the heat dissipation efficiency of the reinforcing piece is improved, and heat is prevented from being accumulated at the reinforcing piece.

Further, the non-ferromagnetic reinforcement has a greater value of impact toughness than the contact blade body.

The beneficial effects are as follows: the impact resistance of the non-ferromagnetic reinforcing piece is set to be stronger than that of the contact blade body, so that the structural strength of the contact blade body can be better increased, and the service life of the contact blade is prolonged.

Further, at least two through grooves are formed, and each through groove is a straight groove extending along the radial direction of the contact blade; or the through grooves comprise a central through groove and edge through grooves, wherein the central through groove is arranged at the center of the contact blade body, and at least two edge through grooves are arranged around the central through groove; or the through groove comprises a circular arc-shaped through groove, a U-shaped through groove or a V-shaped through groove which are arranged on the contact blade body around the center of the contact blade body; alternatively, the through grooves comprise at least two of the above through grooves.

The beneficial effects are as follows: according to actual need, can set up the logical groove of different shapes and size to set up the reinforcement in logical groove department in order to promote the structural strength of contact piece.

Further, an arc-shaped flanging for improving the electric field is arranged on the outer peripheral surface of the contact blade body, and the arc-shaped flanging extends back to one end of the contact blade body for collision.

The beneficial effects are as follows: by arranging the arc-shaped flanging on the outer peripheral surface of the contact blade body, the electric field at the outer peripheral surface of the contact blade body can be improved, and the electric charge is prevented from being concentrated at one point.

In order to achieve the above purpose, the technical scheme of the contact structure provided by the invention is as follows:

the contact structure comprises a contact cup and a contact blade, wherein the contact blade comprises a contact blade body, a through groove is formed in the contact blade body, a reinforcing piece for increasing the strength of the contact blade is arranged at a position, corresponding to the through groove, on the contact blade body, and the reinforcing piece is a non-ferromagnetic reinforcing piece.

The beneficial effects are as follows: the invention is an improved invention. The contact blade can be conveniently fixed through the contact cup, and the structural strength of the contact blade can be enhanced by additionally arranging the reinforcing piece at the grooving part of the contact blade body, so that the service life of the contact blade is prolonged, and the rated mechanical service life of the vacuum circuit breaker is further prolonged. Because the reinforcing piece is a nonferromagnetic reinforcing piece, namely the magnetic conductivity of the reinforcing piece is smaller, the intensity of an induction magnetic field can be effectively reduced, so that the direction change is increased, the arc control magnetic field is increased, and the ablation speed of an arc to a contact blade is reduced to adapt to a larger power transmission grade.

Still further, the non-ferromagnetic stiffener is a conductor.

In order to achieve the above purpose, the technical scheme of the vacuum arc extinguishing chamber provided by the invention is as follows:

the vacuum arc extinguishing chamber comprises a moving contact structure and a fixed contact structure, wherein at least one of the moving contact structure and the fixed contact structure comprises a contact cup and a contact blade, the contact blade comprises a contact blade body, a through groove is formed in the contact blade body, a reinforcing piece for increasing the strength of the contact blade is arranged at a position, corresponding to the through groove, of the contact blade body, and the reinforcing piece is a non-ferromagnetic reinforcing piece.

The beneficial effects are as follows: the invention is an improved invention. The current can be switched on and off through the moving contact structure and the fixed contact structure, the contact blade can be conveniently fixed through the contact cup, and the structural strength of the contact blade can be enhanced by additionally arranging the reinforcing piece at the slotting part of the contact blade body, the service life of the contact blade is prolonged, and the rated mechanical life of the vacuum circuit breaker is further prolonged. Because the reinforcing piece is a nonferromagnetic reinforcing piece, namely the magnetic conductivity of the reinforcing piece is smaller, the intensity of an induction magnetic field can be effectively reduced, so that the direction change is increased, the arc control magnetic field is increased, and the ablation speed of an arc to a contact blade is reduced to adapt to a larger power transmission grade.

Still further, the non-ferromagnetic stiffener is a conductor.

In order to achieve the above purpose, the technical scheme of the vacuum circuit breaker provided by the invention is as follows:

the vacuum circuit breaker comprises an operating mechanism and a vacuum arc-extinguishing chamber structure, wherein the vacuum arc-extinguishing chamber structure comprises at least one vacuum arc-extinguishing chamber, the vacuum arc-extinguishing chamber comprises a moving contact structure and a fixed contact structure, at least one of the moving contact structure and the fixed contact structure comprises a contact cup and a contact blade, the contact blade comprises a contact blade body, a through groove is formed in the contact blade body, reinforcing pieces for increasing the strength of the contact blade are arranged at positions of the contact blade body corresponding to the through groove, and the reinforcing pieces are non-ferromagnetic reinforcing pieces.

The beneficial effects are as follows: the invention is an improved invention. The vacuum arc-extinguishing chamber structure can be a single-port arc-extinguishing chamber structure, a double-port arc-extinguishing chamber structure or a multi-port arc-extinguishing chamber structure, and the switching-on and switching-off of the vacuum arc-extinguishing chamber structure can be conveniently controlled through the operating mechanism. At least one vacuum interrupter in the vacuum interrupter structure is a vacuum interrupter provided with a reinforcement. The current can be switched on and off through the moving contact structure and the fixed contact structure, the contact blade can be conveniently fixed through the contact cup, and the structural strength of the contact blade can be enhanced by additionally arranging the reinforcing piece at the slotting part of the contact blade body, the service life of the contact blade is prolonged, and the rated mechanical life of the vacuum circuit breaker is further prolonged. Because the reinforcing piece is a nonferromagnetic reinforcing piece, namely the magnetic conductivity of the reinforcing piece is smaller, the intensity of an induction magnetic field can be effectively reduced, so that the direction change is increased, the arc control magnetic field is increased, and the ablation speed of an arc to a contact blade is reduced to adapt to a larger power transmission grade.

Still further, the non-ferromagnetic stiffener is a conductor.

Drawings

FIG. 1 is a schematic view of a contact blade according to the present invention;

fig. 2 is a side view of a contact blade of the present invention;

FIG. 3 is a schematic diagram of a contact blade for improving the induced magnetic field in accordance with the present invention;

FIG. 4 is a schematic view of another contact blade according to the present invention;

FIG. 5 is a schematic view of a contact blade according to yet another embodiment of the present invention;

FIG. 6 is a schematic view of a contact blade according to yet another embodiment of the present invention;

FIG. 7 is a schematic view of the structure of the contact according to the present invention;

FIG. 8 is a schematic diagram of the contact structure of the present invention to improve the induced magnetic field;

fig. 9 is a schematic structural view of a vacuum interrupter according to the present invention;

fig. 10 is a schematic structural view of a vacuum interrupter according to the present invention;

fig. 11 is a schematic structural view of a vacuum interrupter according to the present invention.

Reference numerals illustrate:

1. a contact blade; 2. a reinforcing member; 3. arc flanging; 4. a contact blade body; 5. an excitation structure; 6. a conductive rod; 7. a contact shield; 8. a static conductive rod; 9. a stationary end cover plate; 10. a static end shielding cover; 11. metallizing the porcelain shell; 12. a stationary contact structure; 13. a main shield; 14. a moving contact structure; 15. a movable conductive rod; 16. a bellows shield; 17. a bellows; 18. a movable end shield; 19. a movable end cover plate; 20. a movable conductive rod guide sleeve; 21. a stationary end sealing plate; 22. a dead end conductor; 23. arc extinguishing chamber sleeve; 24. a vacuum arc extinguishing chamber; 25. a contact finger seat; 26. watchband contact fingers; 27. a moving end conductor; 28. a fastening bolt; 29. an over travel spring; 30. a spring cylinder; 31. a limit plug; 32. an over travel compression bar; 33. a movable end sealing plate; 34. a vacuum arc-extinguishing chamber structure; 35. the pin shaft is abutted; 36. an insulating pull rod; 37. a post sleeve; 38. a transmission pin shaft; 39. an operating mechanism pull rod; 40. a crank arm box; 41. an air pressure monitoring device; 42. an operating mechanism; 43. and (3) a bracket.

Detailed Description

The present invention is described in further detail below with reference to examples.

Specific embodiment 1 of the contact blade provided by the invention:

the embodiment aims to provide a contact blade which can adapt to a larger power transmission grade and has a longer service life, and the service life of the contact blade is prolonged and the induction magnetic field of the contact blade is reduced by arranging a non-ferromagnetic reinforcing piece at a slot of the contact blade.

As shown in fig. 1-2, the embodiment specifically discloses a contact blade 1, which comprises a contact blade body 4, a through slot is formed in the contact blade body 4, a reinforcing member 2 for increasing the strength of the contact blade 1 is arranged at a position corresponding to the through slot on the contact blade body 4, and the reinforcing member 2 is a non-ferromagnetic reinforcing member 2.

Specifically, the non-ferromagnetic reinforcing member 2 is provided in two ways: firstly, the non-ferromagnetic reinforcement 2 is directly arranged in the through groove, and the through groove is completely filled by the non-ferromagnetic reinforcement 2, so that the reinforcement 2 and the contact blade body 4 form a side wall stop fit of the through groove, the structural strength of the contact blade 1 is increased, and the service life of the contact blade 1 is prolonged; secondly, the contact blade body is provided with a collision surface for contacting and colliding with another contact blade, the non-ferromagnetic reinforcing piece 2 is arranged on the side surface of the contact blade body 4, which is opposite to the collision surface, and the non-ferromagnetic reinforcing piece 2 can completely cover the through groove, on one hand, the reinforcing piece 2 is oppositely arranged at one end of the contact blade body 4 for collision, so that interference of the collision and flow guiding of the contact blade 1 by the reinforcing piece 2 can be avoided; on the other hand, the strength of the contact blade body 4 can be enhanced, and the life of the contact blade 1 can be prolonged. Specifically, the non-ferromagnetic reinforcement member 2 may be integrally connected to the contact blade 1 by explosion welding, and of course, the non-ferromagnetic reinforcement member 2 may be integrally connected to the contact blade 1 by 3D printing or the like.

As shown in fig. 3, the induced current I 'on the contact blade 1 is an eddy current flowing along the circumferential direction of the contact blade 1, the induced magnetic field B' on the contact blade 1 is generated by the induced current I ', and is inward perpendicular to the paper surface (i.e., away from the end of the contact blade 1 for collision), and the induced magnetic field generated at the stiffener 2 is negligible due to the smaller permeability of the non-ferromagnetic stiffener 2, so that the magnitude of the induced magnetic field B' on the contact blade 1 is smaller when the through slot and the stiffener 2 are not provided, thereby increasing the arc control magnetic field in a direction-changing manner. Meanwhile, the induced current I ' is also intercepted by the non-ferromagnetic reinforcement member 2 (corresponding to the situation that the non-ferromagnetic reinforcement member 2 is arranged in the through groove) or the through groove (corresponding to the situation that the non-ferromagnetic reinforcement member 2 is arranged at one end of the contact blade body 4), so that the thermal effect caused by the induced current I ' is reduced, and the heat generated by the induced current I ' is reduced.

By additionally arranging the reinforcing piece 2 at the grooving part of the contact blade body 4, the structural strength of the contact blade 1 can be enhanced, the service life of the contact blade 1 can be prolonged, and the rated mechanical service life of the vacuum circuit breaker can be further prolonged. Meanwhile, as the reinforcing piece 2 is a non-ferromagnetic reinforcing piece 2, namely the magnetic permeability of the reinforcing piece 2 is smaller, the strength of an induced magnetic field can be effectively reduced, so that the direction change is increased, the arc control magnetic field is increased, and the ablation speed of an arc to the contact blade 1 is further reduced to adapt to a larger power transmission grade.

Specific embodiment 2 of the contact blade provided by the invention:

the purpose of this embodiment is to provide a different contact blade, and by setting the non-ferromagnetic reinforcement piece as a conductor, the heat dissipation capacity of the non-ferromagnetic reinforcement piece is improved.

As shown in fig. 1-2, the embodiment specifically discloses a contact blade 1, which comprises a contact blade body 4, a through slot is formed in the contact blade body 4, a reinforcing member 2 for increasing the strength of the contact blade 1 is arranged at a position corresponding to the through slot on the contact blade body 4, the reinforcing member 2 is a non-ferromagnetic reinforcing member 2, and the non-ferromagnetic reinforcing member 2 is a conductor. For example, when the non-ferromagnetic reinforcement is an electrically non-conductive epoxy, its thermal conductivity is 0.2-2.2W/mK; when the non-ferromagnetic reinforcement is electrically conductive stainless steel, its thermal conductivity is 16-24W/mK. For the arrangement of the non-ferromagnetic reinforcement 2, reference may be made to the arrangement in embodiment 1 of the contact blade.

The non-ferromagnetic reinforcing member 2 is arranged as a conductor, and compared with the non-conductor reinforcing member 2, the non-ferromagnetic reinforcing member 2 has larger heat conductivity when being a conductor, so that the heat dissipation efficiency of the reinforcing member 2 is improved, and heat accumulation at the reinforcing member 2 is avoided.

Specific embodiment 3 of the contact blade provided by the invention:

The object of this embodiment is to provide a different contact blade, whereby the mechanical strength of the contact blade is further increased by making the impact resistance of the non-ferromagnetic reinforcement stronger than the impact resistance of the contact blade body.

As shown in fig. 1-2, the embodiment specifically discloses a contact blade 1, which comprises a contact blade body 4, wherein a through slot is formed in the contact blade body 4, a reinforcing member 2 for increasing the strength of the contact blade 1 is arranged at a position corresponding to the through slot on the contact blade body 4, the reinforcing member 2 is a non-ferromagnetic reinforcing member 2, and the impact toughness value of the non-ferromagnetic reinforcing member 2 is larger than that of the contact blade body 4. Specifically, in the present embodiment, the contact blade 1 is made of a copper-chromium alloy material, the reinforcing member 2 is made of a stainless steel material, and since the mechanical properties of stainless steel in terms of impact resistance and the like are superior to those of copper-chromium alloy, the mechanical strength of the reinforced contact blade 1 is greatly improved compared with that before reinforcement. For the arrangement of the non-ferromagnetic reinforcement 2, reference may be made to the arrangement in embodiment 1 of the contact blade.

The impact resistance of the non-ferromagnetic reinforcing member 2 is set to be stronger than that of the contact blade body 4, so that the structural strength of the contact blade body 4 can be better increased, and the service life of the contact blade 1 can be prolonged.

Specific embodiment 4 of the contact blade provided by the invention:

it is an object of this embodiment to provide non-ferromagnetic stiffeners of various shapes.

As shown in fig. 1-2, the embodiment specifically discloses a contact blade 1, which comprises a contact blade body 4, a through slot is formed in the contact blade body 4, a reinforcing member 2 for increasing the strength of the contact blade 1 is arranged at a position corresponding to the through slot on the contact blade body 4, and the reinforcing member 2 is a non-ferromagnetic reinforcing member 2. For the arrangement of the non-ferromagnetic reinforcement 2, reference may be made to the arrangement in embodiment 1 of the contact blade.

As shown in fig. 1 and 4-6, at least two through grooves are provided, and each through groove is a straight groove extending along the radial direction of the contact blade 1; or the through grooves comprise a central through groove and edge through grooves, wherein the central through groove is arranged at the center of the contact blade body 4, and at least two edge through grooves are arranged around the central through groove; or the through groove also comprises a circular arc-shaped through groove, a U-shaped through groove or a V-shaped through groove which are arranged on the contact blade body 4 around the center of the contact blade body 4; alternatively, the through grooves comprise at least two of the above through grooves. Correspondingly, the shape of the non-ferromagnetic reinforcement 2 is adapted to the shape of the through slot.

For example, in fig. 1, three radial straight grooves are provided, which are uniformly distributed on the contact blade 1 in the circumferential direction of the contact blade 1, but in other embodiments two, four or more may be provided; the contact blade body 4 is provided with a central through groove, four edge through grooves uniformly distributed on the same circumference of the contact blade body 4 around the central through groove, and a circular arc-shaped through groove arranged around the central through groove, wherein the circular arc-shaped through groove is changed into a U-shaped through groove in fig. 5, and the circular arc-shaped through groove is changed into a V-shaped through groove in fig. 6; of course, in other embodiments, a central through slot may not be provided; or the number of edge through slots may be two, four or more; or does not include circular arc-shaped through grooves, U-shaped through grooves and V-shaped through grooves. That is, in the present embodiment, the through groove may be provided in the contact blade 1, and the through groove may be any shape in the prior art, as long as the induced current and the induced magnetic field can be blocked. Correspondingly, the shape of the non-ferromagnetic reinforcement 2 is adapted to the shape of the through slot.

According to the actual need, can set up the logical groove of different shapes and sizes to set up reinforcement 2 in logical groove department in order to promote the structural strength of contact piece 1. According to the actual need, can set up the logical groove of different shapes and sizes to set up reinforcement 2 in logical groove department in order to promote the structural strength of contact piece 1.

Specific embodiment 5 of the contact blade provided by the invention:

an object of the present embodiment is to provide a contact blade provided with an arc-shaped flange, by providing the arc-shaped flange on the outer peripheral surface of the contact blade body, thereby improving the electric field at the outer peripheral surface of the contact blade body.

As shown in fig. 1-2, the embodiment specifically discloses a contact blade 1, which comprises a contact blade body 4, a through slot is formed in the contact blade body 4, a reinforcing member 2 for increasing the strength of the contact blade 1 is arranged at a position corresponding to the through slot on the contact blade body 4, and the reinforcing member 2 is a non-ferromagnetic reinforcing member 2. For the arrangement of the non-ferromagnetic reinforcement 2, reference may be made to the arrangement in embodiment 1 of the contact blade. The outer peripheral surface of the contact blade body 4 is provided with an arc-shaped flanging 3 for improving the electric field, and the arc-shaped flanging 3 extends to the opposite side of one end of the contact blade body 4 for collision.

By providing the arc-shaped flange 3 on the outer peripheral surface of the contact blade body 4, the electric field at the outer peripheral surface of the contact blade body 4 can be improved, and the concentration of electric charges at one point can be avoided.

Specific embodiment 1 of the contact structure provided by the invention:

an object of the present embodiment is to provide a contact structure capable of improving an induced magnetic field of a contact blade, by reducing the induced magnetic field of the contact blade, thereby turning to increase an arc control magnetic field of an excitation structure, and further adapting the contact structure to a vacuum circuit breaker with a larger power transmission level.

As shown in fig. 7, this embodiment specifically discloses a contact structure, which includes a contact blade 1 and a contact cup, where the contact blade 1 is any one of the specific embodiments 1-5 of the contact blade 1, and will not be described herein again. Specifically, the embodiment further comprises an excitation structure 5, and two ends of the excitation structure 5 are respectively welded with the contact blade 1 and the conductive rod 6 into a whole. Of course, in other embodiments, the exciting structure may be set as an exciting contact in the chinese patent application with application publication number CN 116313628A and application publication date 2023.06.23 in the background art.

As shown in fig. 3 and 8, when a current I is applied to the contact structure, the current I will generate a magnetic field B after passing through the excitation structure 5, and the magnetic field B is an alternating magnetic field because the current I is an alternating current; according to lenz's law, the alternating magnetic field B causes an induced magnetic field B ' at the contact blade 1, which resists the change of the alternating magnetic field B, which induces an induced current I ' in the contact blade 1. As shown in fig. 3, the induced current I 'on the contact blade 1 is an eddy current flowing along the circumferential direction of the contact blade 1, the induced magnetic field B' on the contact blade 1 is generated by the induced current I ', and is inward perpendicular to the paper surface (i.e., away from the end of the contact blade 1 for collision), and the induced magnetic field generated at the stiffener 2 is negligible due to the smaller permeability of the non-ferromagnetic stiffener 2, so that the magnitude of the induced magnetic field B' on the contact blade 1 is smaller when the through slot and the stiffener 2 are not provided, thereby increasing the arc control magnetic field in a direction-changing manner.

By additionally arranging the reinforcing piece 2 at the grooving part of the contact blade body 4, the structural strength of the contact blade 1 can be enhanced, the service life of the contact blade 1 can be prolonged, and the rated mechanical service life of the vacuum circuit breaker can be further prolonged. Meanwhile, the excitation structure 5 can generate an arc control magnetic field, and the strength of the induction magnetic field can be effectively reduced because the reinforcing piece 2 is a non-ferromagnetic reinforcing piece 2, namely the magnetic conductivity of the reinforcing piece 2 is smaller, so that the arc control magnetic field is increased in a turning way, and the ablation speed of an arc to the contact blade 1 is reduced to adapt to a larger transmission grade.

Specific embodiment 2 of the contact structure provided by the invention:

it is an object of this embodiment to provide a different contact structure by providing a contact shield to improve the electric field of the contact structure.

As shown in fig. 7, this embodiment specifically discloses a contact structure, which includes a contact blade 1 and a contact cup, where the contact blade 1 is any one of the specific embodiments 1-5 of the contact blade 1, and will not be described herein again. Specifically, two ends of the excitation structure 5 are respectively welded with the contact blade 1 and the conductive rod 6 into a whole; the excitation structure 5 is close to conducting rod 6 one end still is equipped with contact shield cover 7, and contact shield cover 7 can protect excitation structure 5, simultaneously, contact shield cover 7 can improve the electric field of contact structure.

Specific embodiment 1 of the vacuum interrupter provided by the invention:

an object of the present embodiment is to provide a vacuum interrupter capable of improving an induced magnetic field of a contact blade, by reducing the induced magnetic field of the contact blade, thereby turning to increase an arc control magnetic field of an excitation structure, and further adapting the vacuum interrupter to a vacuum circuit breaker with a larger power transmission level.

As shown in fig. 9-10, the present embodiment specifically discloses a vacuum interrupter 24, which includes a moving contact structure 14 and a fixed contact structure 12, where at least one of the moving contact structure 14 and the fixed contact structure 12 is the contact structure in the embodiment 1 or 2 of the contact structure in the present invention, and will not be described herein again. Specifically, in the present embodiment, the moving contact structure 14 and the fixed contact structure 12 are both the contact structures in the embodiment 1 or 2 of the above-described contact structure in the present invention, but in other embodiments, one of the moving contact structure 14 and the fixed contact structure 12 is the contact structure in the embodiment 1 or 2 of the above-described contact structure in the present invention.

The current can be switched on and off by the moving contact structure 14 and the fixed contact structure 12. By additionally arranging the reinforcing piece 2 at the grooving part of the contact blade body 4, the structural strength of the contact blade 1 can be enhanced, the service life of the contact blade 1 can be prolonged, and the rated mechanical service life of the vacuum circuit breaker can be further prolonged. Meanwhile, the excitation structure 5 can generate an arc control magnetic field, and the strength of the induction magnetic field can be effectively reduced because the reinforcing piece 2 is a non-ferromagnetic reinforcing piece 2, namely the magnetic conductivity of the reinforcing piece 2 is smaller, so that the arc control magnetic field is increased in a turning way, and the ablation speed of an arc to the contact blade 1 is reduced to adapt to a larger transmission grade.

Specific embodiment 2 of the vacuum interrupter provided by the invention:

the aim of this embodiment is to provide a different vacuum interrupter.

As shown in fig. 9, the embodiment specifically discloses a vacuum interrupter 24, which includes a moving contact structure 14 and a fixed contact structure 12, where the moving contact structure 14 and the fixed contact structure 12 are the contact structures in embodiment 1 or 2 of the contact structure in the present invention, and are not described herein again.

The vacuum arc-extinguishing chamber 24 comprises a metallized ceramic shell 11, and a static end cover plate 9 and a movable end cover plate 19 which are respectively arranged at two ends of the metallized ceramic shell 11, wherein a static conductive rod 8 and a static end shielding cover 10 are arranged at the static end cover plate 9, and the static end rod is fixedly connected with the static contact structure 12; a movable conducting rod 15 and a movable end shielding cover 18 are arranged at the movable end cover plate 19, the movable conducting rod 15 is fixedly connected with the movable contact structure 14, in order to avoid the air leakage phenomenon between the movable conducting rod 15 and the metallized ceramic shell 11, a corrugated pipe 17 is further arranged at one end of the movable conducting rod 15 positioned in the metallized ceramic shell 11, and the other end of the corrugated pipe 17 is fixedly connected with the movable end cover plate 19; in order to improve the electric field, a bellows shield 16 is further arranged at the end of the bellows 17 away from the movable end cover plate 19; a main shielding cover 13 for shielding an electric field between the fixed contact structure 12 and the movable contact structure 14 is arranged in the metallized porcelain shell 11; in order to guide the movable conductive rod 15 conveniently, a movable conductive rod guide sleeve 20 is further arranged at one end of the movable end cover plate 19, which is far away from the corrugated pipe 17.

By additionally arranging the reinforcing piece 2 at the grooving part of the contact blade body 4, the structural strength of the contact blade 1 can be enhanced, the service life of the contact blade 1 can be prolonged, and the rated mechanical service life of the vacuum circuit breaker can be further prolonged. Meanwhile, the excitation structure 5 can generate an arc control magnetic field, and the strength of the induction magnetic field can be effectively reduced because the reinforcing piece 2 is a non-ferromagnetic reinforcing piece 2, namely the magnetic conductivity of the reinforcing piece 2 is smaller, so that the arc control magnetic field is increased in a turning way, and the ablation speed of an arc to the contact blade 1 is reduced to adapt to a larger transmission grade. The corrugated pipe 17 can ensure the air tightness of the vacuum arc-extinguishing chamber 24 in the moving process of the movable conducting rod 15; the moving end shielding case 18, the static end shielding case 10 and the main shielding case 13 can improve the electric field in the vacuum arc-extinguishing chamber 24 to improve the insulating capability of the vacuum arc-extinguishing chamber 24, and simultaneously, can prevent the metal vapor evaporated by the contact blade 1 under the arc ablation from escaping to the metallized ceramic shell 11 and polluting the metallized ceramic shell 11, so as to avoid the reduction of the insulating performance.

Specific embodiment 1 of the vacuum circuit breaker provided by the invention:

an object of the present embodiment is to provide a vacuum circuit breaker capable of improving an induced magnetic field of a contact blade, by reducing the induced magnetic field of the contact blade, thereby turning to increase an arc control magnetic field of an excitation structure, and further adapting the vacuum circuit breaker to a larger power transmission level.

As shown in fig. 10-11, the present embodiment specifically discloses a vacuum circuit breaker, which includes an operating mechanism 42 and a vacuum interrupter structure 34, where the vacuum interrupter structure 34 includes at least one vacuum interrupter 24, and at least one of all vacuum interrupters 24 is the vacuum interrupter 24 in the embodiment 1 or 2 of the vacuum interrupter 24, which is not described herein again. In the present embodiment, the vacuum interrupter structure 34 includes only one vacuum interrupter 24, and the vacuum interrupter 24 is the vacuum interrupter 24 in the embodiment 1 or 2 of the vacuum interrupter 24.

The switching on and off of the vacuum interrupter structure 34 can be conveniently controlled by the operating mechanism 42. At least one vacuum interrupter 24 in the vacuum interrupter structure 34 is a vacuum interrupter 24 provided with a stiffener 2. The current can be switched on and off by the moving contact structure 14 and the fixed contact structure 12. By additionally arranging the reinforcing piece 2 at the grooving part of the contact blade body 4, the structural strength of the contact blade 1 can be enhanced, the service life of the contact blade 1 can be prolonged, and the rated mechanical service life of the vacuum circuit breaker can be further prolonged. Meanwhile, the excitation structure 5 can generate an arc control magnetic field, and the strength of the induction magnetic field can be effectively reduced because the reinforcing piece 2 is a non-ferromagnetic reinforcing piece 2, namely the magnetic conductivity of the reinforcing piece 2 is smaller, so that the arc control magnetic field is increased in a turning way, and the ablation speed of an arc to the contact blade 1 is reduced to adapt to a larger transmission grade.

Specific embodiment 2 of the vacuum circuit breaker provided by the invention:

an object of the present embodiment is to provide a different vacuum circuit breaker.

The embodiment specifically discloses a vacuum circuit breaker, including operating device and vacuum interrupter structure, vacuum interrupter structure includes two at least vacuum interrupter that are connected in parallel each other, and vacuum interrupter that is connected in parallel each other is the vacuum interrupter in embodiment 1 or 2 of above-mentioned vacuum interrupter, and no redundant description is provided here.

At least one vacuum interrupter 24 in the vacuum interrupter structure 34 is a vacuum interrupter 24 provided with a stiffener 2. The current can be switched on and off by the moving contact structure 14 and the fixed contact structure 12. By additionally arranging the reinforcing piece 2 at the grooving part of the contact blade body 4, the structural strength of the contact blade 1 can be enhanced, the service life of the contact blade 1 can be prolonged, and the rated mechanical service life of the vacuum circuit breaker can be further prolonged. Meanwhile, the excitation structure 5 can generate an arc control magnetic field, and the strength of the induction magnetic field can be effectively reduced because the reinforcing piece 2 is a non-ferromagnetic reinforcing piece 2, namely the magnetic conductivity of the reinforcing piece 2 is smaller, so that the arc control magnetic field is increased in a turning way, and the ablation speed of an arc to the contact blade 1 is reduced to adapt to a larger transmission grade. When any of the parallel vacuum interrupters 24 can accommodate a greater voltage, the overall vacuum interrupter power rating can be increased.

Specific embodiment 3 of the vacuum circuit breaker provided by the invention:

The embodiment specifically discloses a vacuum circuit breaker, including operating device and vacuum interrupter structure, vacuum interrupter structure includes two vacuum interrupter that establish ties each other, and at least one of vacuum interrupter that establish ties each other is the vacuum interrupter in embodiment 1 or 2 of above-mentioned vacuum interrupter, and no further description is provided here.

At least one vacuum interrupter 24 in the vacuum interrupter structure 34 is a vacuum interrupter 24 provided with a stiffener 2. The current can be switched on and off by the moving contact structure 14 and the fixed contact structure 12. By additionally arranging the reinforcing piece 2 at the grooving part of the contact blade body 4, the structural strength of the contact blade 1 can be enhanced, the service life of the contact blade 1 can be prolonged, and the rated mechanical service life of the vacuum circuit breaker can be further prolonged. Meanwhile, the excitation structure 5 can generate an arc control magnetic field, and the strength of the induction magnetic field can be effectively reduced because the reinforcing piece 2 is a non-ferromagnetic reinforcing piece 2, namely the magnetic conductivity of the reinforcing piece 2 is smaller, so that the arc control magnetic field is increased in a turning way, and the ablation speed of an arc to the contact blade 1 is reduced to adapt to a larger transmission grade. When one of the series connected vacuum interrupters 24 is able to accommodate a larger voltage, the power transmission rating of the entire vacuum interrupter can be increased.

Specific embodiment 4 of the vacuum circuit breaker provided by the invention:

an object of the present embodiment is to provide a different vacuum interrupter.

As shown in fig. 10-11, the present embodiment specifically discloses a vacuum circuit breaker, which includes an operating mechanism 42 and a vacuum interrupter structure 34, where the vacuum interrupter structure 34 includes at least one vacuum interrupter 24, and at least one of all vacuum interrupters 24 is the vacuum interrupter 24 in the embodiment 1 or 2 of the vacuum interrupter 24, which is not described herein again.

In this embodiment, as shown in fig. 10-11, the present embodiment specifically discloses a vacuum circuit breaker, which includes an operating mechanism 42 and a vacuum interrupter structure 34, where the vacuum interrupter structure 34 includes an interrupter sleeve 23, a stationary end sealing plate 21 and a movable end sealing plate 33 are disposed at two ends of the interrupter sleeve 23, a vacuum interrupter 24 is disposed inside the interrupter sleeve 23, and the vacuum interrupter 24 is the vacuum interrupter 24 in embodiment 1 or 2 of the vacuum interrupter 24, which is not described herein again.

A static end conductor 22 is arranged at the static end sealing plate 21, and the static end conductor 22 is fixedly connected with a static conductive rod 8 of a vacuum arc extinguishing chamber 24; the movable conducting rod 15 of the vacuum arc-extinguishing chamber 24 extends out of the metallized ceramic shell 11 and is provided with a contact finger seat 25, a watchband contact finger 26 is arranged below the contact finger seat 25, and the watchband contact finger 26 is in slidable electric connection with the movable end conductor 27, so that the movable conducting rod 15 is ensured to be electrically connected with the movable end conductor 27 when moving.

In order to facilitate controlling the movement of the movable conductive rod 15, in this embodiment, the movable conductive rod 15 is fixedly connected with the spring barrel 30 through the fastening bolt 28, the spring barrel 30 is provided with an over-travel spring 29, the over-travel pressing rod 32 extends into the spring barrel 30 to compress the over-travel spring 29, and a limiting plug 31 is further provided on the inner peripheral surface of the spring barrel 30 for limiting the movement of the over-travel pressing rod 32 to the limit position of the over-travel spring 29.

The vacuum circuit breaker further comprises a bracket 43, the operating mechanism 42 is arranged on the bracket 43, a support sleeve 37 is further arranged above the bracket 43, and the vacuum interrupter structure 34 is arranged above the support sleeve 37. The over-travel compression bar 32 is fixedly connected with an insulation pull rod 36 through a butt joint pin 35, and the insulation pull rod 36 is fixedly connected with an operating mechanism pull rod 39 through a transmission pin 38. The operating mechanism 42 further includes a lever box 40, the lever box 40 being disposed below the post sleeve 37. The bracket 43 is further provided with a gas pressure monitoring device 41 for detecting the gas pressure in the arc extinguishing chamber bushing 23 and the pillar bushing 37.

When the switch is closed, the operating mechanism 42 drives the operating mechanism pull rod 39 to move, the operating mechanism pull rod 39 drives the insulating pull rod 36 to move, the insulating pull rod 36 drives the over-travel pressure rod 32 to move upwards so as to compress the over-travel spring 29, and the over-travel spring 29 drives the moving contact to move upwards; after closing, the over travel plunger 32 continues to move upward a distance to ensure that the moving and stationary contacts are not sprung apart by the electromotive force. When the brake is released, the operating mechanism 42 drives the operating mechanism pull rod 39 to move, the operating mechanism pull rod 39 drives the insulating pull rod 36 to move, the insulating pull rod 36 drives the over-travel pressure rod 32 to move downwards to release the over-travel spring 29, after the over-travel pressure rod 32 moves for a certain distance (i.e. after the over-travel spring 29 does not have over-travel), the over-travel pressure rod 32 continues to move downwards, and the moving contact moves downwards simultaneously to realize brake release.

It should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments, but may be modified without inventive effort or equivalent substitution of some of the technical features thereof by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The contact blade comprises a contact blade body, wherein a through groove is formed in the contact blade body, and the contact blade body is characterized in that a reinforcing piece for increasing the strength of the contact blade is arranged at a position corresponding to the through groove and is a non-ferromagnetic reinforcing piece.

2. The contact blade of claim 1, wherein the non-ferromagnetic stiffener is disposed in a through slot, and the through slot is completely filled with the non-ferromagnetic stiffener.

3. The contact blade according to claim 1, wherein the contact blade body has a collision surface for contact collision with another contact blade, the non-ferromagnetic reinforcement is arranged on the side of the contact blade body facing away from the collision surface, and the non-ferromagnetic reinforcement is capable of completely covering the through slot.

4. A contact blade according to any one of claims 1 to 3, wherein the non-ferromagnetic reinforcement is a conductor.

5. A contact blade according to any one of claims 1 to 3, wherein the non-ferromagnetic reinforcement has a greater value of impact toughness than the contact blade body.

6. A contact blade according to any one of claims 1-3, wherein there are at least two through slots, each through slot being a straight slot extending radially of the contact blade; or the through grooves comprise a central through groove and edge through grooves, wherein the central through groove is arranged at the center of the contact blade body, and at least two edge through grooves are arranged around the central through groove; or the through groove comprises a circular arc-shaped through groove, a U-shaped through groove or a V-shaped through groove which are arranged on the contact blade body around the center of the contact blade body; alternatively, the through grooves comprise at least two of the above through grooves.

7. A contact blade according to any one of claims 1-3, characterized in that the outer circumferential surface of the contact blade body is provided with an arc-shaped turn-up for improving the electric field, which extends away from the end of the contact blade body for impact.

8. Contact structure comprising a contact cup and a contact blade, characterized in that the contact blade is a contact blade according to any one of claims 1-7.

9. The vacuum arc extinguishing chamber comprises a moving contact structure and a fixed contact structure, and is characterized in that at least one of the moving contact structure and the fixed contact structure is the contact structure in claim 8.

10. Vacuum circuit breaker comprising an operating mechanism and a vacuum interrupter arrangement, characterized in that the vacuum interrupter arrangement comprises at least one vacuum interrupter as claimed in claim 9.