CN114141576A - Contact structure and its vacuum interrupter - Google Patents

Abstract

The invention discloses a contact structure, wherein a longitudinal magnetic contact seat is coaxially connected with a static conductive rod, the longitudinal magnetic contact seat comprises at least one spiral groove arranged on the side wall of the longitudinal magnetic contact seat, current flows through the longitudinal magnetic contact seat to generate a longitudinal magnetic field, a contact blade is coaxially connected with the longitudinal magnetic contact seat, the contact blade is provided with at least one through groove for adjusting the longitudinal magnetic field, a flat moving contact is coaxially connected with a movable conductive rod, and the flat moving contact is separated from or contacted with the contact blade.

Description

Contact structure and its vacuum interrupter

technical field

The invention relates to the technical field of vacuum interrupters, in particular to a contact structure and a vacuum interrupter.

Background technique

The high-voltage circuit breaker is an important switchgear in the power system, which is of great significance to the safe operation of the power system. Since SF6 gas is designated as a strong temperature effect gas by the Kyoto Protocol, the development of vacuum circuit breakers with environmentally friendly characteristics to higher voltage levels is of great significance to reduce the use of SF6 gas.

The vacuum interrupter is an important part of the vacuum circuit breaker. In order to improve the short-circuit breaking capacity of the high-voltage vacuum interrupter, a magnetic field is usually introduced into the arc interrupter to control the vacuum arc, which is mainly divided into longitudinal magnetic field and transverse magnetic field. However, in the traditional transverse magnetic contact structure, the magnetic field strength in the central area of the contact gap is weak, and the magnetic blowing force cannot meet the arc extinguishing requirements, while the longitudinal magnetic field contact can control the arc shape during arcing and suppress the arcing. Agglomeration and anode spot generation reduce the ablation of the contact surface, and its breaking performance is better than that of the transverse magnetic field contact at higher voltage levels.

In the traditional longitudinal magnetic contact system, both the dynamic and static contacts are longitudinal magnetic field contacts, which are suitable for ordinary arc breaking with large opening distance. When the short gap arc breaking with rapid current transfer, the longitudinal magnetic field has redundancy. At the same time, the traditional cup-shaped longitudinal magnetic contact system has low mechanical strength, large mass of moving parts, low contact separation speed, and insufficient breaking capacity, so it is not suitable for large-capacity vacuum interrupters.

Therefore, how to improve the flow capacity and breaking performance of the vacuum interrupter has become an urgent problem to be solved in the research of vacuum interrupter.

The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in the art to a person of ordinary skill in the art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a contact structure and its vacuum interrupter. In the structure, the static contact adopts a longitudinal magnetic structure and is provided with a contact piece. Structure, the moving contact adopts a simple plate structure. When the arc extinguishing chamber breaks the current, under the action of the fast repulsion mechanism, the plate moving contact moves rapidly, so that the moving plate contact and the static contact piece are quickly separated. The arc is generated at the center, and the longitudinal magnetic field generated by the longitudinal magnetic structure of the static contact regulates the arc at the center, suppressing the arc gathering and the generation of anode spots, thereby reducing the ablation of the contact surface. The rapid repulsion mechanism is generally used in the current transfer type rapid breaking. Compared with the conventional vacuum interrupter contact structure, the mass of the moving parts of the vacuum interrupter contact structure in the present invention is greatly reduced, which is beneficial to the contact Fast separation and improved breaking performance; the existence of static contact pieces makes the arc generated in the center position, so that the longitudinal magnetic field can regulate the arc and reduce the ablation of the contacts, so the static contact piece is essential; at the same time, The flat moving contact has a simple structure, which makes the flow structure simpler and more efficient, and can greatly improve the flow capacity.

In order to achieve the above object, the present invention provides the following technical solutions:

A contact structure of the present invention includes,

static conductors,

A longitudinal magnetic contact seat, which is coaxially connected to the static conducting rod, the longitudinal magnetic contact seat includes at least one helical groove arranged on its side wall, and current flows through the longitudinal magnetic contact seat to generate a longitudinal magnetic field ,

a contact piece, which is coaxially connected to the longitudinal magnetic contact base, the contact piece is provided with at least one through slot for adjusting the longitudinal magnetic field,

moving conductive rod,

A flat plate movable contact is coaxially connected with the movable conductive rod, and the flat plate movable contact is separated from or in contact with the contact piece.

In the above-mentioned contact structure, the cross-sectional area of the flat plate movable contact is larger than that of the movable conductive rod, and the cross-sectional area of the contact piece is larger than that of the static conductive rod.

In the above-mentioned contact structure, the cross-sectional area of the flat plate movable contact is the same as the cross-sectional area of the contact piece.

In the contact structure, at least one of the spiral grooves communicates with the through grooves.

In the above-mentioned contact structure, a plurality of the through grooves are symmetrical with respect to the center of the contact piece.

In the above-mentioned contact structure, the through groove extends to the outer edge of the contact piece.

In the contact structure described above, the longitudinal magnetic contact base is a cylindrical structure, the contact piece is a disc structure, and the disc structure is detachably connected to the open end of the cylindrical structure.

In one of the contact structures, the cylindrical structure is cylindrical.

In the above-mentioned contact structure, the static conductive rod and the static conductive rod form a cup-mounted longitudinal magnetic structure or a coil-type longitudinal magnetic structure.

A vacuum interrupter includes the contact structure.

In the above technical solution, the contact structure provided by the present invention has the following beneficial effects: in the contact structure and the vacuum interrupter of the present invention, the longitudinal magnetic field generated by the static contact can still affect the arc Effective control is produced, contact ablation is reduced, and the flat contact structure is used as the moving contact, the quality of the moving parts is greatly reduced, the contact separation speed is improved, and the breaking performance is greatly improved. The flat contact structure is used as a moving contact, the flat contact structure is simple, the current path is obviously shortened, and the flow capacity between the contacts is improved. The flat-plate contact structure is used as a moving contact. Compared with the general longitudinal magnetic contact, the mechanical strength of the flat-plate moving contact is enhanced, which improves the safety and reliability of the device. The flat contact structure is used as a moving contact, which makes the entire arc extinguishing chamber structure simpler and more efficient, and the manufacturing cost is greatly reduced. The end of the static contact is provided with a contact piece, which can cause the arc to be generated at the center of the contact, so that the longitudinal magnetic field can effectively control the arc, thereby reducing the ablation effect of the arc on the contact and prolonging the service life.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only described in the present invention. For some of the embodiments, those of ordinary skill in the art can also obtain other drawings according to these drawings.

1 is a schematic structural diagram of an embodiment of a contact structure;

FIG. 2 is a schematic structural diagram of a longitudinal magnetic contact seat and a contact piece according to an embodiment of the contact structure.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to accompanying drawings 1 and 2 in the embodiments of the present invention. The described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc., or The positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

In one embodiment, as shown in Figures 1-2, the contact structure includes,

Static Conductor Rod 1,

The longitudinal magnetic contact base 2 is coaxially connected to the static conductive rod 1 , the longitudinal magnetic contact base 2 includes at least one spiral groove 6 provided on the side wall thereof, and current flows through the longitudinal magnetic contact base 2 to generate a longitudinal magnetic field,

The contact piece 3 is coaxially connected to the longitudinal magnetic contact base 2, and the contact piece 3 is provided with at least one through slot 7 for adjusting the longitudinal magnetic field,

Moving conductive rod 5,

The flat plate movable contact 4 is coaxially connected with the movable conductive rod 5 , and the flat plate movable contact 4 is separated from or in contact with the contact piece 3 .

In a preferred embodiment of the above-mentioned contact structure, the cross-sectional area of the flat plate movable contact 4 is larger than that of the movable conductive rod 5 , and the cross-sectional area of the contact piece 3 is larger than that of the static conductive rod 1 . .

In a preferred embodiment of the above-mentioned contact structure, the cross-sectional area of the flat plate movable contact 4 is the same as the cross-sectional area of the contact piece 3 .

In a preferred embodiment of the contact structure, at least one of the spiral grooves 6 communicates with the through grooves 7 .

In a preferred embodiment of the above-mentioned contact structure, a plurality of the through grooves 7 are symmetrical with respect to the center of the contact piece 3 .

In the preferred embodiment of the contact structure, the through groove 7 extends to the outer edge of the contact piece 3 .

In a preferred embodiment of the above-mentioned contact structure, the longitudinal magnetic contact base 2 is a cylindrical structure, the contact piece 3 is a disc structure, and the disc structure is detachably connected to the cylindrical structure. open end.

In a preferred embodiment of the contact structure, the cylindrical structure is cylindrical.

In a preferred embodiment of the contact structure, the static conductive rod 1 and the static conductive rod 1 form a cup-mounted longitudinal magnetic structure or a coil-type longitudinal magnetic structure.

In one embodiment, the movable conductive rod 5 is coaxial with the static conductive rod 1 .

In one embodiment, the movable conductive rod 5 and the flat plate movable contact 4 are made of lightweight materials.

In one embodiment, the contact structure includes a static contact structure and a moving contact structure; the static contact structure includes a static conductive rod 1, a longitudinal magnetic contact base 2 and a contact piece 3; the moving contact structure Including moving conductive rod 5 and flat moving contact 4 . The static conductive rod is coaxially connected to the top of the contact base, and the contact piece is coaxially connected to the bottom end of the longitudinal magnetic contact base. The static contact structure generates a longitudinal magnetic field to regulate the arc, and the contact piece makes the position of the arc in the center. To reduce the eddy current, the contact piece will be slotted 7; the moving conductive rod is coaxially connected to the flat moving contact, and under the action of the rapid repulsion mechanism, the flat moving contact can be quickly separated from the static contact. In the static contact structure, the longitudinal magnetic contact base 2 and the static conductive rod 1 are directly coaxially connected. In order to comply with the manufacturing process of the vacuum interrupter under high temperature conditions, there is no other insulating material filling or padding in the longitudinal magnetic contact base. The sheet structure only relies on the strength of the metal material itself to form the support in the closed state. In the static contact structure, a spiral groove 6 is opened on the wall of the longitudinal magnetic contact base 2, and a longitudinal magnetic field is generated in the contact gap when the current flows through the contact base. The static contact structure is provided with a contact piece 3. When the contacts are separated, an arc will be generated at the center of the contact piece, which is regulated by the longitudinal magnetic field. The contact piece is provided with a contact piece slot 7, the contact piece slot can reduce eddy current, and at the same time, the longitudinal magnetic field generated by the static contact structure can be regulated by adjusting the slotting angle and width of the contact piece slot. In the movable contact structure, the flat plate movable contact 4 and the movable conductive rod 5 are directly coaxially connected, and can move rapidly under the action of the rapid repulsion mechanism.

In one embodiment, the contact structure includes a static conductive rod 1 , a longitudinal magnetic contact base 2 , a contact piece 3 , a flat plate movable contact 4 and a movable conductive rod 5 . The static conductive rod 1 and the longitudinal magnetic contact base 2 are directly coaxially connected to ensure the stability of the static contact structure. Other structures with the same function. The bottom of the longitudinal magnetic contact base 2 is provided with a contact piece 3, and the longitudinal magnetic contact base and the contact piece are coaxially connected, and the generated longitudinal magnetic field can regulate the arc at the center of the contact piece to avoid arc accumulation. The flat plate moving contact 4 and the moving conductive rod 5 are directly coaxially connected. Compared with the conventional longitudinal magnetic moving contact, the flat plate contact has a simple and reliable structure, and the moving quality is greatly reduced, which can greatly improve the moving contact when the contacts are separated. speed and improve breaking performance. Under normal working conditions, the contact piece 3 and the flat moving contact 4 are in contact with each other, the contact area is large, the flow path is short, and the contact resistance is small, which can reduce the heating effect caused by the flow, thereby improving the flow capacity between the contacts. .

As shown in Figure 2, the longitudinal magnetic contact base and the contact piece in the static contact structure mainly include the longitudinal magnetic contact base 2, the contact piece 3, and the longitudinal magnetic contact base 2 has a spiral groove 6 on the wall. The contact piece 3 is provided with a contact piece groove 7, and the longitudinal magnetic contact base 2 is provided with a number of spiral grooves 6. When the current flows through the contact base, a longitudinal magnetic field will be generated between the generated contacts. The contact piece 3 is provided with a number of contact piece grooves 7, which can reduce eddy currents on the one hand, and control the longitudinal magnetic field between the contacts by changing parameters such as the angle width of the contact piece grooves.

Under normal working conditions, as shown in Figure 1, the contact piece 3 and the plate movable contact 4 are in close contact with each other. The plate structure makes the contact area between the contacts larger, the flow path is smaller, and the thermal effect generated by the contact resistance is smaller. Therefore, it has a greater current capacity. In the current transfer type of rapid breaking, a rapid repulsion mechanism is generally used. When the circuit is short-circuited, the moving and static contacts are separated, and an arc is generated. After the moving contact moves a certain distance, the short-circuit current will be reduced. transfer, the arc is extinguished. In the present invention, the plate movable contact 4 and the movable conductive rod 5 move rapidly under the action of the rapid repulsion mechanism, the movable and static contacts are separated, and an arc is generated at the center of the contact piece 3 . After the arc is generated, the longitudinal magnetic contact base 2 in the static contact structure generates a longitudinal magnetic field between the contacts, which regulates the arc, prevents the arc from accumulating, reduces the ablation of the contacts, and the flat moving contact 4 moves. After a certain distance, the current is diverted and the arc is extinguished. In the dynamic and static contact structure of the present invention, the longitudinal magnetic static contact generates a longitudinal magnetic field to control the arc, and the flat plate dynamic contact has a simple structure, which greatly reduces the quality of the moving parts, thereby facilitating the rapid separation of the contacts and improving the breaking performance.

As shown in Figure 2, the bottom of the longitudinal magnetic contact base 2 is connected with a contact piece 3. The existence of the contact piece makes the arc generated at the center of the contact, which is more convenient for the regulation of the longitudinal magnetic field. The contact piece 3 is provided with a contact piece 3. The head chip slot 7 can reduce the eddy current and at the same time regulate the longitudinal magnetic field between the contacts.

The moving plate contact 4 shown in FIG. 1 has a simple structure, high mechanical strength and high economy, which can greatly improve the safety and service life of the contact and reduce the production cost.

A vacuum interrupter includes the contact structure.

The static contact of this structure adopts a longitudinal magnetic contact structure and is provided with a contact piece, and the moving contact adopts a flat contact structure. Compared with the conventional vacuum interrupter contact structure, the dynamic and static contact structure of the present invention not only The arc can be regulated by the longitudinal magnetic field, and the mass of the moving parts is greatly reduced, so that the contact separation speed is increased, and the breaking performance is improved; Flow capacity; the flat moving contact has a simple structure and high mechanical strength, which improves the safety and service life of the contact and reduces the production cost.

Industrial Applicability

The contact structure and its vacuum interrupter according to the present invention can be used in electric power.

Finally, it should be noted that the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, those skilled in the art can obtain the results without creative work. All other embodiments fall within the protection scope of the present application.

Certain exemplary embodiments of the present invention have been described above by way of illustration only, and it is needless to say that those skilled in the art may The described embodiments are modified. Accordingly, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of the claims of the present invention.

Claims (10)

1. A contact structure, characterized in that it comprises, static conductors, A longitudinal magnetic contact seat, which is coaxially connected to the static conducting rod, the longitudinal magnetic contact seat includes at least one helical groove arranged on its side wall, and current flows through the longitudinal magnetic contact seat to generate a longitudinal magnetic field , a contact piece, which is coaxially connected to the longitudinal magnetic contact base, the contact piece is provided with at least one through slot for adjusting the longitudinal magnetic field, moving conductive rod, A flat plate movable contact is coaxially connected with the movable conductive rod, and the flat plate movable contact is separated from or in contact with the contact piece. 2 . The contact structure according to claim 1 , wherein, preferably, the cross-sectional area of the flat plate movable contact is larger than that of the movable conductive rod, and the cross-sectional area of the contact piece is larger than that of the movable conductive rod. 3 . The static conducting rod. 3 . The contact structure according to claim 1 , wherein the cross-sectional area of the flat plate movable contact is the same as the cross-sectional area of the contact piece. 4 . 4 . The contact structure according to claim 1 , wherein at least one of the spiral grooves communicates with the through grooves. 5 . 5 . The contact structure according to claim 1 , wherein the plurality of through grooves are centrally symmetric with respect to the center of the contact piece. 6 . 6 . The contact structure according to claim 1 , wherein the through groove extends to the outer edge of the contact piece. 7 . 7 . The contact structure according to claim 1 , wherein the longitudinal magnetic contact seat is a cylindrical structure, the contact piece is a disc structure, and the disc structure is detachably connected to the cylinder. 8 . the open end of the structure. 8 . The contact structure according to claim 7 , wherein the cylindrical structure is cylindrical. 9 . 9 . The contact structure according to claim 1 , wherein the static conductive rod and the static conductive rod form a cup-mounted longitudinal magnetic structure or a coil-type longitudinal magnetic structure. 10 . 10. A vacuum interrupter comprising the contact structure according to any one of claims 1-9.

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