CN112530735B

CN112530735B - Double-loop contact structure and vacuum arc extinguish chamber

Info

Publication number: CN112530735B
Application number: CN202011507105.8A
Authority: CN
Inventors: 李鹏; 杨哲; 潘峰; 颜莉萍
Original assignee: Xi'an High Voltage Electrical Apparatus Research Institute Co ltd
Current assignee: Xian High Voltage Apparatus Research Institute Co Ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2022-12-13
Anticipated expiration: 2040-12-18
Also published as: CN112530735A

Abstract

The invention discloses a double-loop contact structure and a vacuum arc-extinguishing chamber, and relates to the technical field of vacuum switches. The invention comprises a conductive rod, wherein one end of the outer side of the conductive rod is electrically connected with a field loop body, one end of the conductive rod, which is positioned inside the field loop body, is electrically connected with a through-flow loop element, one end of the field loop body, which is far away from the conductive rod, is electrically connected with a contact blade, and the contact blade is electrically connected with the through-flow loop element. The vacuum arc-extinguishing chamber shell is internally provided with the two contact structures, so that the vacuum arc-extinguishing chamber shell has the capacity of conducting large rated current in a closing keeping state, when a fault occurs, circuit fault current mainly flows through the conducting rod, the field loop body and the contact blades, the field loop body generates a longitudinal magnetic field, electric arcs can be extinguished when the two contact structures are separated, and the vacuum arc-extinguishing chamber shell has the capacity of breaking large short-circuit current.

Description

Double-loop contact structure and vacuum arc extinguish chamber

Technical Field

The invention belongs to the technical field of vacuum switches, and particularly relates to a double-loop contact structure and a vacuum arc-extinguishing chamber.

Background

Along with the development of an electric power system, the application of the vacuum circuit breaker is rapidly developed, the technical requirements of the system on the vacuum circuit breaker are continuously improved, and the vacuum switch faces a technical problem in the development process of high voltage and large current: the rated current and the on-off current are contradictory;

the vacuum arc-extinguishing chamber is a key element of the vacuum switch, and is used for extinguishing electric arc, the closing and opening of circuit current are completed by contacts in the vacuum arc-extinguishing chamber, in order to raise the short-circuit opening and closing capability of the arc-extinguishing chamber, a magnetic field control technology is adopted, in which a magnetic field is introduced into the arc-extinguishing chamber to control electric arc, namely electric arc, however, in the prior art, the longitudinal magnetic field contact adopted in the longitudinal magnetic field control technology has a complex structure, so that the path through which current flows is long, the conduction resistance of the switch structure is large when the contacts are closed, the heat loss is large, the rated current of the switch structure is limited, and the rated current capacity is small.

Disclosure of Invention

The invention aims to provide a double-loop contact structure and a vacuum arc-extinguishing chamber, which aim to solve the existing problems: in the prior art, the longitudinal magnetic field contact adopted in the longitudinal magnetic field control technology has a complex structure, so that the path through which current flows is long, the on-resistance of the switch structure is large when the contact is closed, the heat loss is large, the rated current of the switch structure is limited, and the rated current capacity is small.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the utility model provides a two return circuit contact structure, the contact structure includes the conducting rod, the one end electric connection in the conducting rod outside has the field return circuit body, the inside electric connection that the one end of conducting rod just is located the field return circuit body has through-flow loop element, the one end electric connection that the conducting rod was kept away from to the field return circuit body has the contact piece, just contact piece and through-flow loop element electric connection.

Preferably, the throughflow circuit element has a sheet-like shape.

Further, the through-flow circuit element is a thin sheet with a diameter of 50mm and a thickness of 1 mm.

Preferably, the material of the through-flow circuit element is PTC thermal sensitive ceramic.

Preferably, one end of the conducting rod is provided with a threaded insert, the through-current loop element and the contact blade are both provided with a through-nail hole, a fastening screw is inserted into the through-nail hole and is in threaded connection with the threaded insert, and the conducting rod, the contact blade and the through-current loop element are fixed together through the fastening screw and the threaded insert.

Preferably, the conducting rod and the field loop body are integrally formed or fixedly connected.

Preferably, the field loop body is a cup-shaped longitudinal magnetic cup structure or a coil longitudinal magnetic structure.

A vacuum arc extinguish chamber comprises two double-loop contact structures and a vacuum arc extinguish chamber shell, wherein the double-loop contact structures are any one of the two double-loop contact structures; the contact structures are placed in the vacuum arc extinguish chamber shell, one of the contact structures is connected with the vacuum arc extinguish chamber shell in a sliding mode, and the other contact structure is fixedly connected with the vacuum arc extinguish chamber shell; the inside of vacuum arc extinguishing chamber shell is provided with the shield cover, just the shield cover is located the outside that two contact structures are close to one end each other, the bellows has been cup jointed in the outside of gliding contact structure.

The invention has the following beneficial effects:

the vacuum arc extinguish chamber shell is internally provided with the two contact mechanisms, so that the vacuum arc extinguish chamber shell has the capacity of conducting large rated current in a closing keeping state, when a fault occurs, circuit fault current mainly flows through the conducting rod, the field loop body and the contact blades, the field loop body generates a longitudinal magnetic field, the two contact mechanisms are separated, and the vacuum arc extinguish chamber shell has the capacity of breaking large short-circuit current.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is an exploded view of a contact structure of a dual circuit contact structure of the present invention;

FIG. 2 is an exploded view of a contact structure of a dual circuit contact structure of the present invention;

FIG. 3 is a diagram of the rated current path of a dual-loop contact configuration of the present invention;

FIG. 4 is a fault current flow path diagram of a dual-loop contact configuration of the present invention;

fig. 5 is a schematic diagram of a dual-circuit contact structure and an overall structure of a vacuum interrupter according to the present invention.

In the drawings, the reference numbers indicate the following list of parts:

1. a conductive rod; 2. a field loop body; 3. a contact blade; 4. a through-flow circuit element; 5. a vacuum interrupter chamber housing; 6. a shield case; 7. a bellows.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

referring to fig. 1-4, the present embodiment discloses a dual-loop contact structure, which includes a conductive rod 1, a field loop body 2 electrically connected to an end of the conductive rod 1 outside, a through-current loop element 4 electrically connected to an end of the conductive rod 1 and located inside the field loop body 2, a contact blade 3 electrically connected to an end of the field loop body 2 away from the conductive rod 1, and the contact blade 3 electrically connected to the through-current loop element 4;

specifically, the through-flow circuit element 4 is in a shape of a sheet, which may be a sheet of Φ 50mm and a thickness of 1mm, the surface of the sheet is subjected to metallization, and the material of the through-flow circuit element 4 may be PTC thermosensitive ceramic;

one end of the conductive rod 1 is provided with a threaded insert, the contact blade 3 and the through-current loop element 4 are both internally provided with a through-nail hole, a fastening screw is inserted into the through-nail hole and is in threaded connection with the threaded insert, and the conductive rod 1, the contact blade 3 and the through-current loop element 4 are fixed together through the fastening screw and the threaded insert;

in detail, the connection mode of the conducting rod 1 and the field loop body 2 can be one of integral molding or fixed connection;

here, the field loop body 2 may be one of a cup-shaped longitudinal magnetic cup structure or a coil longitudinal magnetic structure;

in the use process, the temperature of the through-flow loop element 4 is low when the through-flow loop element bears rated current, the internal resistance is small, the electric conduction characteristic is presented, the temperature of the through-flow loop element 4 is increased due to the internal current when the through-flow loop element bears fault current, the resistance is increased in a step mode when the temperature of the through-flow loop element 4 is increased, the resistance characteristic is presented, in the fault process, the through-flow loop element 4 is in the resistance characteristic, at the moment, circuit current mainly flows through the conductive rod 1, the field loop body 2 and the contact blade 3, the field loop body 2 generates a longitudinal magnetic field, and when the two contact structures are automatically separated.

Example two:

referring to fig. 5, the present embodiment discloses a vacuum interrupter including the dual-circuit contact structure of the first embodiment, including a vacuum interrupter housing 5 and two contact structures, where the contact structures are placed inside the vacuum interrupter housing 5, and one of the contact structures is slidably connected to the vacuum interrupter housing 5, and the other contact structure is fixedly connected to the vacuum interrupter housing 5, a shielding cover 6 is provided inside the vacuum interrupter housing 5, and the shielding cover 6 is located at an outer side of one end of the two contact structures, where the outer side of the sliding contact structure is sleeved with a corrugated pipe 7;

when the contact structure is in a closing holding state, the through-current loop element 4 has electrical conductivity, and at the moment, the circuit current mainly flows through the conductive rod 1, the through-current loop element 4 and the contact blade 3;

when a fault occurs, the through-current loop element 4 has a resistance characteristic, at the moment, circuit fault current mainly flows through the conductive rod 1, the field loop body 2 and the contact blade 3, the field loop body 2 generates a longitudinal magnetic field, so that the two contact mechanisms are separated, and the device has the capacity of breaking large short-circuit current.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A dual-circuit contact structure, comprising: the contact structure comprises a conductive rod (1), one end of the outer side of the conductive rod (1) is electrically connected with a field loop body (2), one end of the conductive rod (1) and the inner part of the field loop body (2) are electrically connected with a through-flow loop element (4), one end of the field loop body (2) far away from the conductive rod (1) is electrically connected with a contact piece (3), and the contact piece (3) is electrically connected with the through-flow loop element (4);

the material of the through-flow loop element (4) is PTC thermal sensitive ceramic.

2. A double-circuit contact arrangement according to claim 1, characterized in that the through-current circuit element (4) is sheet-like in shape.

3. A double circuit contact arrangement according to claim 2, characterized in that the circulating circuit element (4) is a foil with a diameter of 50mm and a thickness of 1 mm.

4. The double-circuit contact structure according to claim 1, wherein a threaded insert is arranged at one end of the conductive rod (1), the through-current circuit element (4) and the contact blade (3) are both internally provided with a through-nail hole, a fastening screw is inserted into the through-nail hole and is in threaded connection with the threaded insert, and the conductive rod (1), the contact blade (3) and the through-current circuit element (4) are fixed together through the fastening screw and the threaded insert.

5. A double-circuit contact structure according to claim 1, characterized in that the conducting rod (1) and the field-circuit body (2) are integrally formed or fixedly connected.

6. A dual-loop contact structure according to claim 1, wherein the field loop body (2) is a cup-shaped longitudinal magnetic cup structure or a coil longitudinal magnetic structure.

7. Vacuum interrupter, characterized in that it comprises two double-circuit contact arrangements according to any of claims 1-5, and further comprises a vacuum interrupter housing (5); the contact structures are placed in a vacuum arc-extinguishing chamber shell (5), one of the contact structures is in sliding connection with the vacuum arc-extinguishing chamber shell (5), and the other contact structure is fixedly connected with the vacuum arc-extinguishing chamber shell (5); the inside of vacuum interrupter shell (5) is provided with shield cover (6), just shield cover (6) are located two contact structures and are close to the outside of one end each other, bellows (7) have been cup jointed in the outside of gliding contact structure.