CN219457516U - DC switching-on and switching-off arc extinguishing chamber - Google Patents
DC switching-on and switching-off arc extinguishing chamber Download PDFInfo
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- CN219457516U CN219457516U CN202320809687.8U CN202320809687U CN219457516U CN 219457516 U CN219457516 U CN 219457516U CN 202320809687 U CN202320809687 U CN 202320809687U CN 219457516 U CN219457516 U CN 219457516U
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Abstract
The utility model belongs to the technical field of circuit breakers, and particularly relates to a direct current breaking arc-extinguishing chamber which comprises a fixed contact system, a moving contact system and a magnetic blowing system which are arranged in a tank body, wherein environment-friendly insulating gas is filled in the tank body; the magnetic blowing system is arranged above the contact of the fixed contact system and the moving contact system; the magnetic blowing system is provided with two sets and is oppositely arranged on the inner wall of the tank body; the magnetic blowing system comprises a magnet supporting piece and permanent magnets, wherein C-shaped grooves are formed in the magnet supporting piece, and the open sides of the C-shaped grooves of the two magnet supporting pieces are oppositely arranged; the permanent magnet is arranged in the C-shaped groove; the polarities of the two permanent magnets are opposite; the magnet support piece is fixed on the inner wall of the tank body. When the arc extinguishing chamber is opened, when the movable and static arc contacts are separated, an arc is generated, and the arc can be elongated under the action of an external constant magnetic field along with the increase of the opening distance of the movable and static arc contacts, so that the arc extinguishing is finally achieved in an environment-friendly insulating gas medium.
Description
Technical Field
The utility model belongs to the technical field of circuit breakers, and particularly relates to a direct current breaking arc-extinguishing chamber.
Background
The high-voltage direct-current breaker is one of key equipment of a high-voltage direct-current transmission system and is used for switching an operation mode of the direct-current transmission system and cutting faults, and the development and application of a direct-current transmission technology are determined by the design and manufacturing level of the high-voltage direct-current breaker. Common dc circuit breakers are air circuit breakers, solid state circuit breakers, hybrid circuit breakers, oscillating mechanical circuit breakers. The arc energy of the arc extinguishing chamber of the air circuit breaker is large and the breaking difficulty is large; the solid-state circuit breaker adopts power electronic equipment, so that the cost is high, and the overcurrent capacity is low; the hybrid circuit breaker is relatively complex in structure; the oscillating mechanical breaker comprises a self-oscillating breaker and an oscillating breaker, the self-oscillating switch has long on-off time, and the oscillating breaker needs an additional charging device. The explosion chamber is a core component formed by the circuit breaker, so the development of the direct current breaking explosion chamber with high reliability, high performance, low cost and environmental protection is a common difficulty at present.
There are methods for increasing the arc voltage by using a blow coil to create a magnetic blow system that uses a broken arc voltage to force current to be transferred from one leg to another. Through searching, patent document CN 210006633U discloses a direct current arc extinguishing chamber utilizing the method, which comprises a contact system, an arc blowing system and an arc extinguishing system, wherein the contact system adopts a flat contact or a transverse magnetic contact or a longitudinal magnetic contact or a magnetic arc blowing contact, and the arc blowing system comprises an arc blowing coil and an arc blowing circuit; the arc blowing system is arranged at one side of the arc extinguishing system. The direct current arc-extinguishing chamber which utilizes the external magnetic field to regulate and control to improve the arc voltage of the arc-extinguishing chamber requires an arc-blowing circuit and a coil, the structure of the direct current arc-extinguishing chamber is relatively complex, and meanwhile, the adopted contact system is a flat plate type or magnetic contact which is mostly applied to a vacuum circuit breaker. If this solution is implemented on a conventional puffer circuit breaker, it is inconvenient to implement. Firstly, if an arc blowing circuit and a coil are added in the arc extinguishing chamber, the distribution of the electric field intensity in the arc extinguishing chamber is affected, and the breaking capacity of the arc extinguishing chamber is affected. Secondly, because the conventional air-compression type circuit breaker is filled with insulating gas with certain pressure in the arc extinguishing chamber, an arc blowing circuit and a coil are added in the arc extinguishing chamber, and the air tightness of the arc extinguishing chamber is affected in the process of leading wires of the control circuit and the coil out of the arc extinguishing chamber. If the scheme is arranged outside the arc extinguishing chamber, a large arc blowing circuit and coil are required, the integral structure of the conventional air compression type breaker is affected, and the implementation is not facilitated.
Disclosure of Invention
The utility model aims to provide a direct current breaking arc-extinguishing chamber, which solves the problems that the prior arc-extinguishing chamber is provided with a large arc-extinguishing circuit and a large coil, the integral structure of a conventional air-compression type circuit breaker is influenced, and the implementation is not facilitated.
The utility model is realized by the following technical scheme:
a direct current breaking arc extinguish chamber comprises a fixed contact system, a moving contact system and a magnetic blowing system which are arranged in a tank body, wherein environment-friendly insulating gas is filled in the tank body;
the magnetic blowing system is arranged above the contact of the fixed contact system and the moving contact system;
the magnetic blowing system is provided with two sets and is oppositely arranged on the inner wall of the tank body;
the magnetic blowing system comprises a magnet supporting piece and permanent magnets, wherein C-shaped grooves are formed in the magnet supporting piece, and the open sides of the C-shaped grooves of the two magnet supporting pieces are oppositely arranged; the permanent magnet is arranged in the C-shaped groove; the polarities of the two permanent magnets are opposite;
the magnet support piece is fixed on the inner wall of the tank body.
Further, the static contact system comprises a static contact support piece, a static contact and a static arc contact, wherein the static contact and the static arc contact are fixed on the static contact support piece, and the static contact support piece is fixedly connected with the voltage applying end on one side.
Further, the moving contact system comprises a moving contact, a moving arc contact, a pressure cylinder, a supporting piece, a middle contact, a piston, a pull rod joint and a pull rod;
the movable contact, the movable arc contact and the air pressing cylinder are fixed on the supporting piece, the supporting piece is connected with one end of the pull rod joint, and the other end of the pull rod joint is connected with the pull rod through an insulating pull rod;
the middle contact and the piston are connected with the voltage application end at the other side;
the whole movable contact system is insulated from the tank body.
Further, one end of the magnet support is an inlet into which the permanent magnet can be fitted, and an insulating cover plate is installed at the inlet.
Further, the insulating cover plate is bolted to the magnet support.
Further, the magnet supporting piece and the insulating cover plate are made of polytetrafluoroethylene or insulating oxide.
Further, the upper end face of the magnet supporting piece is an arc face which is matched with the inner wall of the tank body.
Further, a through hole is prefabricated on the upper end surface of the magnet support piece, a fixed seat is prefabricated on the tank body, and a screw hole is prefabricated in the fixed seat;
during installation, the free end of the screw stretches into the screw hole, and the fixing seat is embedded into the tank body through welding.
Further, the permanent magnet is made of an insulating oxide.
Compared with the prior art, the utility model has the following beneficial technical effects:
the utility model discloses a direct current breaking arc extinguish chamber which comprises a fixed contact system, a moving contact system and a magnetic blowing system which are arranged in a tank body, wherein environment-friendly insulating gas is filled in the tank body; the magnetic blowing system comprises a magnet support and permanent magnets, wherein the permanent magnets are arranged in the magnet support, and the polarities of the two permanent magnets are opposite; when the arc extinguishing chamber is opened, when the movable and static arc contacts are separated, an arc is generated, and the arc can be elongated under the action of an external constant magnetic field along with the increase of the opening distance of the movable and static arc contacts, so that the arc extinguishing is finally achieved in an environment-friendly insulating gas medium. The arc-extinguishing chamber is only partially designed in a conventional mature compressed air arc-extinguishing chamber, the distribution of electric field intensity in the arc-extinguishing chamber cannot be influenced by the design, the air tightness of the arc-extinguishing chamber cannot be influenced, and the integral structure of the circuit breaker cannot be influenced.
Furthermore, one end of the magnet support piece is an inlet capable of being filled with a permanent magnet, an insulating cover plate is arranged at the inlet, and the insulating cover plate is used for plugging, so that the magnet is reliably fixed in the tank body.
Further, the through hole is prefabricated on the up end of magnet support piece, installs the fixing base on the jar body, prefabricated has the screw hole in the fixing base, and during the installation, the screw is by inside-out installation, carries out screw thread fit with the fixing base through embedding to jar in the wall, and convenient operation, the fixing base is embedded into jar internal through the welding mode moreover, has guaranteed jar tightness of the body, prevents the internal gas leakage of jar.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a dc-cut arc extinguishing chamber according to the present utility model;
FIG. 2 is a schematic diagram of a magnetic blow-through system according to the present utility model;
FIG. 3 is a schematic view of a structure of a magnet support; FIG. 3a is a side view of a magnet support; FIG. 3B is a B-B cross-sectional view of FIG. 3 a;
fig. 4 is a schematic structural view of an insulating cover plate.
1. A stationary side cover plate; 2. a tank body; 3. environmental protection type insulating gas; 4. a stationary contact support; 5. a stationary contact; 6. static arc contacts; 7. a magnet support; 8. a permanent magnet; 9. a fixing seat; 10. a screw; 11. a moving contact; 12. a moving arc contact; 13. a pressure cylinder; 14. a support member; 15. a middle contact; 16. a piston; 17. a pull rod joint; 18. a movable side cover plate; 19. sealing the cover plate; 20. a pull rod; 21. an insulating cover plate;
71. screw holes.
Detailed Description
The objects, technical solutions and advantages of the present utility model will be more apparent from the following detailed description with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the utility model, i.e., the embodiments described are merely some, but not all, of the embodiments of the utility model.
The components illustrated in the figures and described and shown in the embodiments of the utility model may be arranged and designed in a wide variety of different configurations, and thus the detailed description of the embodiments of the utility model provided in the figures below is not intended to limit the scope of the utility model as claimed, but is merely representative of selected ones of the embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model, based on the figures and embodiments of the present utility model.
It should be noted that: the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, element, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, element, method, article, or apparatus.
The features and properties of the present utility model are described in further detail below with reference to examples.
As shown in fig. 1-2, the utility model discloses a direct current breaking arc-extinguishing chamber, which comprises a fixed contact system, a moving contact system and a magnetic blowing system which are arranged in a tank body 2, wherein environment-friendly insulating gas 3 is filled in the tank body 2; the magnetic blowing system is arranged above the contact of the fixed contact system and the moving contact system; the magnetic blowing system is provided with two sets and is oppositely arranged on the inner wall of the tank body 2; the magnetic blowing system comprises a magnet support piece 7 and a permanent magnet 8, wherein a C-shaped groove is formed in the magnet support piece 7, and the open sides of the C-shaped grooves of the two magnet support pieces 7 are oppositely arranged; the permanent magnet 8 is arranged in the C-shaped groove; the two permanent magnets 8 are opposite in polarity; the magnet support 7 is fixed on the inner wall of the tank 2.
As shown in fig. 1, the static contact system of the arc extinguishing chamber comprises a static contact support 4, a static contact 5 and a static arc contact 6, wherein the static contact 5 and the static arc contact 6 are fixed on the static contact support 4, and the static contact support 4 is fixedly connected with a voltage applying end at one side. The whole static contact system is insulated from the tank body 2; the static side of the tank body is provided with a static side cover plate 1.
Specifically, the moving contact system of the arc extinguishing chamber comprises a moving contact 11, a moving arc contact 12, a pressure cylinder 13, a supporting piece 14, a middle contact 15, a piston 16, a pull rod joint 17 and a pull rod 20, and a moving side cover plate 18 and a sealing cover plate 19 are arranged on the moving side of the tank body. The movable contact 11, the movable arc contact 12 and the air cylinder 13 are fixed on the supporting piece 14, the supporting piece 14 is connected with the pull rod joint 17, the pull rod joint 17 is connected with the insulating pull rod, and the other end of the insulating pull rod is connected with the pull rod 20; the intermediate contact 15 and the plunger 16 are connected to the other side voltage application terminal. The whole moving contact system is insulated from the tank body 2.
As shown in fig. 3a and 3b, a through hole is prefabricated on the upper end surface of the magnet support 7, a fixed seat 9 is prefabricated on the tank body, and a screw hole for fixed installation is arranged in the fixed seat 9; when in installation, as shown in fig. 2, the free ends of the screws 10 extend into the screw holes, and the fixing base 9 is embedded into the tank body through welding to ensure the tightness of the tank body 2 and prevent the gas in the tank body 2 from leaking.
As shown in fig. 1, the magnet support 7 is fixed to the fixing base 9 by two screws 10.
More preferably, as shown in fig. 3b, the permanent magnet 8 is inserted into the magnet support 7 from the open end of the magnet support 7, and is sealed with an insulating cover 21, so as to ensure reliable fixing of the permanent magnet 8 to the tank 2.
As shown in fig. 4, the upper surface of the insulating cover 21 is also an arc surface, which is the same as the upper arc surface of the magnet supporting member 7 and corresponds to the inner wall of the tank 2.
The magnet support 7 and the insulating cover plate 21 are made of polytetrafluoroethylene insulating pieces or insulating oxide bodies, and the permanent magnet 8 is made of insulating oxide bodies, so that the permanent magnet can resist the instantaneous temperature of at least 2000K and can resist the corrosion of environment-friendly insulating gas. The permanent magnets 8 can be selected according to the required magnetic field requirement, and one set of permanent magnets is arranged up and down, and the arrangement is performed by paying attention to the polarities of the upper permanent magnet 8 and the lower permanent magnet 8, so that the polarities of the upper permanent magnet 8 and the lower permanent magnet 8 are kept opposite.
The inner diameter of a contact of a fixed contact 5 in the fixed contact system is matched with the outer diameter of a moving contact 11 in the moving contact system; the outer diameter of the static arc contact 6 in the static contact system is matched with the inner diameter of the moving arc contact 12 in the moving contact system.
When the arc extinguishing chamber is opened, the mechanism drives the pull rod 20, and then the pull rod 20 drives the transfer contact 11, the moving arc contact 12, the air cylinder 13, the supporting piece 14 and the pull rod joint 17 of the moving part in the insulation pull rod and moving contact system to move rightwards, so that when the moving and static arc contacts are separated, an arc is generated. With the increase of the opening distance of the movable arc contact and the static arc contact, the arc can be elongated under the action of an external constant magnetic field, and finally, the arc extinguishing is achieved in an environment-friendly insulating gas medium;
when the arc extinguishing chamber is switched on, the mechanism drives the pull rod 20 to move leftwards, at this time, all moving parts act in the reverse direction of the switching-off operation, so that the movable arc contact 12 is in effective contact with the static arc contact 6 and the movable contact 11 is in effective contact with the static contact 5, and a closed loop is formed when two voltage application ends are switched on through a movable contact system and a static contact system.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the utility model without departing from the spirit and scope of the utility model, which is intended to be covered by the claims.
Claims (9)
1. The direct current breaking arc extinguishing chamber is characterized by comprising a fixed contact system, a moving contact system and a magnetic blowing system which are arranged in a tank body (2), wherein environment-friendly insulating gas (3) is filled in the tank body (2);
the magnetic blowing system is arranged above the contact of the fixed contact system and the moving contact system;
the magnetic blowing system is provided with two sets and is oppositely arranged on the inner wall of the tank body (2);
the magnetic blowing system comprises a magnet support piece (7) and a permanent magnet (8), wherein a C-shaped groove is formed in the magnet support piece (7), and the open sides of the C-shaped grooves of the two magnet support pieces (7) are oppositely arranged; the permanent magnet (8) is arranged in the C-shaped groove; the polarities of the two permanent magnets (8) are opposite;
the magnet supporting piece (7) is fixed on the inner wall of the tank body (2).
2. The direct current breaking arc extinguishing chamber according to claim 1, characterized in that the static contact system comprises a static contact support (4), a static contact (5) and a static arc contact (6), the static contact (5) and the static arc contact (6) are fixed on the static contact support (4), and the static contact support (4) is fixedly connected with a side voltage applying end.
3. A dc breaking arc chute according to claim 1, characterized in that the moving contact system comprises a moving contact (11), a moving arcing contact (12), a pressure cylinder (13), a support (14), a middle contact (15), a piston (16), a pull rod joint (17) and a pull rod (20);
the movable contact (11), the movable arc contact (12) and the air pressing cylinder (13) are fixed on the supporting piece (14), the supporting piece (14) is connected with one end of the pull rod joint (17), and the other end of the pull rod joint (17) is connected with the pull rod (20) through the insulating pull rod (20);
the middle contact (15) and the piston (16) are connected with the voltage application end at the other side;
the whole movable contact system is insulated from the tank body (2).
4. A direct current breaking arc chute according to claim 1, characterized in that one end of the magnet support (7) is an inlet into which the permanent magnet (8) can be fitted, at which inlet an insulating cover plate (21) is mounted.
5. A dc breaking arc chute according to claim 4, characterized in that the insulating cover plate (21) is bolted to the magnet support (7).
6. A dc breaking arc chute according to claim 4, characterized in that the magnet support (7) and the insulating cover plate (21) are made of polytetrafluoroethylene or an insulating oxide.
7. A direct current breaking arc extinguishing chamber according to claim 1, characterized in that the upper end face of the magnet support (7) is a cambered surface adapted to the inner wall of the can (2).
8. The direct current breaking arc extinguishing chamber according to claim 1, characterized in that a through hole is prefabricated on the upper end surface of the magnet support (7), a fixing seat (9) is prefabricated on the tank body (2), and a screw hole (71) is prefabricated in the fixing seat (9);
when the novel tank is installed, the free ends of the screws (10) extend into the screw holes (71), and the fixing base (9) is embedded into the tank body (2) through welding.
9. A direct current breaking arc extinguishing chamber according to claim 1, characterized in that the permanent magnet (8) is of an insulating oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320809687.8U CN219457516U (en) | 2023-04-12 | 2023-04-12 | DC switching-on and switching-off arc extinguishing chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320809687.8U CN219457516U (en) | 2023-04-12 | 2023-04-12 | DC switching-on and switching-off arc extinguishing chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219457516U true CN219457516U (en) | 2023-08-01 |
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ID=87385089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320809687.8U Active CN219457516U (en) | 2023-04-12 | 2023-04-12 | DC switching-on and switching-off arc extinguishing chamber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219457516U (en) |
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2023
- 2023-04-12 CN CN202320809687.8U patent/CN219457516U/en active Active
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