CN116313628A - Contact structure of vacuum arc-extinguishing chamber - Google Patents

Abstract

The invention discloses a contact structure of a vacuum interrupter. In the contact structure of the vacuum interrupter, a static contact is arranged at the bottom end of the static conductive rod, the static contact has a first diameter, and the movable contact Aligning the fixed contacts, the movable contacts have a second diameter smaller than the first diameter, the movable conductive rod extends from the end of the movable contacts away from the fixed contacts, and the longitudinal magnetic contacts are sleeved on the movable contacts The head is peripheral and movable relative to the movable contact, the longitudinal magnetic contact has a hollow inner diameter of a second diameter and an outer diameter of a third diameter, the contact base is away from the static contact from the longitudinal magnetic contact One end of the head extends, and the inner side of the end of the contact base away from the static contact is provided with a groove, and a spring contact finger abutting against the moving conductive rod is arranged in the groove, and the contact base and the moving conductive rod form a parallel relationship so that the longitudinal magnetic The contacts and moving contacts are at the same potential and can move relative to each other.

Description

Vacuum Interrupter Contact Structure

technical field

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

Background technique

With the continuous development of the power system, the role of switching devices in the power system is becoming more and more important. As the core structure of the vacuum circuit breaker, the vacuum interrupter undertakes the important responsibility of arc ignition and arc extinguishing. In recent years, as the application of vacuum switches in high-voltage and high-current power systems has become more and more common, the performance requirements for vacuum interrupters have also become higher and higher. Through the specific contact structure, the vacuum interrupter can make the arc current formed between the contacts generate a longitudinal magnetic field parallel to them. The longitudinal magnetic field acts on the arc current, which can greatly increase the ions near the anode and reduce the arc voltage. , reduce the ablation of the contacts, make the diffused arc turn to the concentrated arc, and improve the arc extinguishing ability of the vacuum interrupter. In order to improve the arc extinguishing performance, the vacuum interrupter usually increases the diameter of the contact, but blindly increasing the diameter of the contact will lead to excessive mass of the contact, a waste of too much operating work, and a load on the mechanism If it is too large, it will affect the overall life of the vacuum interrupter over time.

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.

Contents of the invention

The object of the present invention is to provide a contact structure of a vacuum interrupter, which can effectively reduce the load of the moving contact mechanism and effectively improve the arc extinguishing performance. Under the action of the longitudinal magnetic field formed by the contact structure, the vacuum arc can be more Quickly extinguish, reduce contact ablation and ablation of other parts of the arc extinguishing chamber.

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

A vacuum interrupter contact structure of the present invention includes:

Static conductive rod;

a static contact, which is arranged at the bottom end of the static conductive rod, and the static contact has a first diameter;

a moving contact aligned with the stationary contact, the moving contact having a second diameter smaller than the first diameter;

a moving conductive rod extending from an end of the moving contact away from the static contact;

a longitudinal magnetic contact sleeved on the periphery of the movable contact and movable relative to the movable contact, the longitudinal magnetic contact having a hollow inner diameter of a second diameter and an outer diameter of a third diameter;

The contact base extends from the end of the longitudinal magnetic contact away from the fixed contact, and the inner side of the end of the contact base away from the fixed contact is provided with a groove, and a spring contact abutting against the moving conductive rod is arranged in the groove. The finger, the contact base and the moving conductive rod form a parallel relationship so that the longitudinal magnetic contact and the moving contact are at the same potential and can move relatively.

In the contact structure of the vacuum interrupter, several inclined slots are evenly distributed along the circumferential direction on the side walls of the static contact, the moving contact and the longitudinal magnetic contact.

In the contact structure of the vacuum interrupter, the static contact and the movable contact are hollow structures.

In the vacuum interrupter contact structure, the third diameter is equal to the first diameter.

In the contact structure of the vacuum interrupter, the height of the longitudinal magnetic contact is lower than that of the movable contact, and when the static contact is separated from the movable contact, the longitudinal magnetic contact and the movable contact are approximately at the same height.

In the vacuum interrupter contact structure, the longitudinal magnetic contact and the contact base are welded on the vacuum interrupter.

In the vacuum interrupter contact structure, the static contact is coaxially connected to the static conductive rod, the movable conductive rod is coaxially connected to the movable contact, and the contact base is coaxially connected to the longitudinal magnetic contact .

In the contact structure of the vacuum interrupter, the fixed contact, the moving contact and the longitudinal magnetic contact are coaxial.

In the contact structure of the vacuum interrupter, contact pieces are provided on the contacting surfaces of the static contacts and the moving contacts.

In the vacuum interrupter contact structure, the contact piece is provided with a through groove extending to the outer edge of the contact piece, and at least one inclined groove communicates with the through groove.

In the above technical solution, the contact structure of a vacuum interrupter provided by the present invention has the following beneficial effects: In the contact structure of a vacuum interrupter according to the present invention, the diameter of the movable contact is small, which reduces the The quality of the moving contact makes the mechanism run faster, the operating work is reduced, and the arc extinguishing performance of the vacuum interrupter is effectively improved. The introduction of the longitudinal magnetic contact and the contact base effectively increases the total diameter of the contact. Since there is a strong positive correlation between the breaking capacity of the vacuum arc and the diameter of the contact, it can be better when the moving and static contacts are separated. Regulate the arc, introduce the vacuum arc into a larger space, improve the arc extinguishing performance of the vacuum interrupter, improve and reduce the ablation of contacts and other parts of the interrupter. The side walls of the static contact, the moving contact and the longitudinal magnetic contact are evenly distributed with several inclined slots along their circumferential direction, which can form a magnetic field parallel to the current direction when the current passes. Different from the traditional longitudinal magnetic field, in this structure, inclined slots are arranged on both the moving contact and the longitudinal magnetic contact, which can make the distribution of the generated longitudinal magnetic field more uniform, thereby improving the arc extinguishing performance of the vacuum interrupter.

Description of drawings

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

Fig. 1 is a structural schematic diagram of an embodiment of a vacuum interrupter contact structure;

Fig. 2 is a schematic cross-sectional structure diagram of an embodiment of the contact structure of the vacuum interrupter;

Fig. 3 is a schematic diagram of the contact structure of an embodiment of the contact structure of the vacuum interrupter;

Fig. 4 is a schematic diagram of the contact separation structure of an embodiment of the vacuum interrupter contact structure;

Fig. 5 is a schematic diagram of the contact separation structure of an embodiment of the vacuum interrupter contact structure;

Fig. 6 is a schematic diagram of the ideal current flow of the contact structure of an embodiment of the vacuum interrupter contact structure;

Fig. 7 is a structural schematic diagram of an embodiment of the contact structure of the vacuum interrupter.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with Figures 1 to 7 in the embodiments of the present invention. Obviously, the The described embodiments are some, but not all, embodiments of the invention. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts 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 claimed invention, but merely represents selected embodiments of the invention. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

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

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

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it can be directly connected or indirectly connected through an intermediary, it can be the internal communication of two elements or the interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

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

In one embodiment, as shown in FIGS. 1 to 7 , the vacuum interrupter contact structure includes:

Static conductive rod 1;

A static contact 2, which is arranged at the bottom end of the static conductive rod 1, and the static contact 2 has a first diameter;

a moving contact 3 aligned with said stationary contact 2, said moving contact 3 having a second diameter smaller than the first diameter;

A moving conductive rod 4 extending from an end of the moving contact 3 away from the static contact 2;

The longitudinal magnetic contact 5 is sheathed on the periphery of the movable contact 3 and is movable relative to the movable contact 3. The longitudinal magnetic contact 5 has a hollow inner diameter of the second diameter and an outer diameter of the third diameter ;

The contact base 6 extends from the end of the longitudinal magnetic contact 5 away from the static contact 2, and the inner side of the end of the contact base 6 away from the static contact 2 is provided with a groove 8, and the groove 8 is provided with a stop The spring contact finger 7 connected to the moving conductive rod 4, the contact base 6 and the moving conductive rod 4 form a parallel relationship so that the longitudinal magnetic contact 5 and the moving contact 3 are equipotential and relatively movable.

In the preferred embodiment of the contact structure of the vacuum interrupter, several inclined slots are uniformly distributed along the circumferential direction on the side walls of the static contact 2 , the movable contact 3 and the longitudinal magnetic contact 5 .

In the preferred embodiment of the contact structure of the vacuum interrupter, the static contact 2 and the movable contact 3 are hollow structures.

In a preferred embodiment of the contact structure of the vacuum interrupter, the third diameter is equal to the first diameter.

In the preferred embodiment of the contact structure of the vacuum interrupter, the height of the longitudinal magnetic contact 5 is lower than that of the movable contact 3. When the static contact 2 is separated from the movable contact 3, the longitudinal magnetic contact 5 and the movable contact The moving contacts 3 are approximately at the same height.

In the preferred embodiment of the contact structure of the vacuum interrupter, the longitudinal magnetic contact 5 and the contact base 6 are welded on the vacuum interrupter.

In the preferred embodiment of the contact structure of the vacuum interrupter, the static contact 2 is coaxially connected with the static conductive rod 1, the movable conductive rod 4 is connected coaxially with the movable contact 3, and the contact base 6 and the The longitudinal magnetic contacts 5 are coaxially connected.

In the preferred embodiment of the contact structure of the vacuum interrupter, the fixed contact 2, the moving contact 3 and the longitudinal magnetic contact 5 are coaxial.

In the preferred embodiment of the contact structure of the vacuum interrupter, contact pieces 9 are provided on the contact surfaces of the static contact 2 and the movable contact 3 .

In the preferred embodiment of the contact structure of the vacuum interrupter, the contact piece 9 is provided with a through groove extending to the outer edge of the contact piece 9, and at least one inclined groove communicates with the through groove.

In one embodiment, the movable contact 3 and the static contact 2 are arranged symmetrically, and the top of the movable and static contact 2 respectively extends a movable conductive rod 4 and a static conductive rod 1. The diameter of the static contact 2 is slightly larger than that of the movable contact 3, and the movable contact 3 A hollow longitudinal magnetic contact 5 with a larger diameter is arranged on the periphery, and the contact base 6 extends downward from the longitudinal magnetic contact 5 . A groove 8 is provided inside the contact base 6 to connect with the spring contact finger 7 of the moving conductive rod 4 . The outer walls of the static contact 2, the moving contact 3 and the longitudinal magnetic contact 5 are all provided with a chute structure to provide a longitudinal magnetic field. It not only reduces the moving mass of the traditional movable contact 3, but also increases the total diameter of the conduction vacuum arc, thereby reducing the operating work of the mechanism and improving the arc extinguishing performance of the vacuum interrupter.

In one embodiment, the chute is a spiral groove.

In one embodiment, the contact structure of the vacuum interrupter includes a static conductive rod 1, a static contact 2, a moving contact 3, a moving conductive rod 4, a longitudinal magnetic contact 5, and a contact base 6, wherein the static The contact 2 and the movable contact 3 are placed symmetrically; the static conductive rod 1 extends from the top of the static contact 2, and the movable conductive rod 4 extends from the top of the movable contact 3; the longitudinal magnetic contact 5 is arranged on the periphery of the movable contact 3, The contact base 6 extends from the bottom of the longitudinal magnetic contact 5 and is connected with the spring contact finger of the moving conductive rod 4 .

As shown in Fig. 1 and Fig. 2, several inclined slots are evenly distributed along the circumferential direction on the side walls of the static contact 2, the movable contact 3 and the longitudinal magnetic contact 5.

As shown in Figure 1 and Figure 2, the static contact 2 and the moving contact 3 are hollow, the diameter of the static contact 2 is slightly larger than that of the moving contact 3, and the combined diameter of the moving contact 3 and the longitudinal magnetic contact 5 is the same as that of the static contact. The diameters of the contacts 2 are comparable.

As shown in Fig. 3, Fig. 4 and Fig. 5, the height of the vertical magnetic contact 5 is slightly lower than that of the moving contact 3, and when the static contact 2 is separated from the moving contact 3, it is approximately at the same height as the moving contact 3.

As shown in FIG. 2 , the longitudinal magnetic contact 5 and the contact base 6 are designed to be hollow, and a groove 8 is provided inside the contact base 6 , and a spring contact finger 7 is arranged inside the groove 8 .

As shown in Fig. 3, Fig. 4 and Fig. 5, the positions of the longitudinal magnetic contact 5 and the contact base 6 are fixed.

The working principle of the contact structure of the vacuum interrupter is:

Referring to Fig. 3, Fig. 4 and Fig. 5, it is a schematic diagram of the moving contact 3 and the static contact 2 in the closed state, the just separated state and the completely separated state in sequence, which is the whole process of the moving conductive rod 4 gradually moving downward.

When the moving contact 3 and the static contact 2 are in the closed state, the current flows in from the static guide rod, flows through the static contact 2, the moving contact 3 in turn, and finally flows out from the moving electric guide rod; and when the moving contact 3 When separated from the static contact 2, the longitudinal magnetic contact 5 with a larger peripheral diameter of the movable contact 3 will gradually approach the static contact 2 at this time, because the movable contact 3 and the longitudinal magnetic contact 5 with a larger peripheral diameter are in The circuit of the entire vacuum interrupter is connected in parallel, so the generated vacuum arc will not only flow into the moving contact 3, but also a large part will be transferred to the longitudinal magnetic contact 5 with a larger diameter. Referring to Figure 6, at this time, the current flows in from the static conductive rod 1, and after flowing through the static contact 2, part of the current will continue to flow into the moving contact 3, while the other part of the current will flow into the longitudinal magnetic contact 5 and the contact base 6 , and finally through the spring contact finger 7, the two currents converge on the moving conductive rod 4 again, and finally flow out from the moving conductive rod 4. Since there is a strong positive correlation between the breaking capacity of the vacuum arc and the diameter of the contact, in addition, under the action of the longitudinal magnetic field generated by the current itself, it is beneficial for the vacuum arc to be extinguished quickly in a short time. In addition, the spring contact fingers 7 are used to connect the contact base 6 and the movable conductive rod 4, which can not only ensure the parallel relationship between them, that is, ensure that they are equipotential, but also satisfy the relative movement between them.

In the contact structure of a high-current vacuum interrupter according to the present invention, the purpose of opening inclined slots on the static contact 2, the moving contact 3 and the longitudinal magnetic contact 5 is to control the flow direction of the current so that it has The hoop component produces a longitudinal magnetic field parallel to the direction of the current flow. In addition, opening inclined slots on the moving contact 3 and the longitudinal magnetic contact 5 is different from the contact structure of the traditional vacuum interrupter. The superposition of the longitudinal magnetic field formed by the two can make the magnetic field distribution more uniform, which is more conducive to the flow direction of the current. , forming a positive feedback. The longitudinal magnetic field acts on the arc current, which can make the diffused arc turn to the concentrated arc, reduce the ablation of the contacts, and improve the arc extinguishing ability of the vacuum interrupter.

A fixed longitudinal magnetic contact 5 and a contact base 6 are arranged around the moving contact 3, which effectively reduces the diameter and mass of the moving contact 3, speeds up the movement speed of the mechanism, reduces the invalid operation work of the mechanism, and improves The arc extinguishing ability of the vacuum interrupter.

Of course, the above solution is just one of the implementation cases, and we can make changes in some aspects. In other embodiments, the gap between the moving contact 3 and the longitudinal magnetic contact 5, the moving conductive rod 4 and the contact base 6 can be adjusted; position; the chute distributed on the movable contact 3 can be adjusted or even discarded, etc., as long as the final implementation is more conducive to arc extinguishing. One of the feasible implementations is illustrated below by way of example.

As shown in FIG. 7 , the main difference from the above embodiment is that the movable contact 3 is solid, and there is no chute uniformly distributed along the circumferential direction to control the current flow, and it is a flat contact. And the rest of the structural parts are the same as the above-mentioned embodiment. Its advantage is that when the total current flowing through the vacuum interrupter is large, even if the longitudinal magnetic contacts 5 around the movable contact 3 shunt a part of the current, the current passing through the movable contact 3 is still very large. At this time, the flat head The movable contact 3 of the structure can well control the temperature rise of the contact, prolong the service life of the contact, and the like.

Finally, it should be noted that the described embodiments are only some of the embodiments of the present application, rather than all of them. Based on the embodiments of the present application, those skilled in the art have obtained the results without creative work. All other embodiments belong to the protection scope of this application.

Certain exemplary embodiments of the present invention have been described above only by way of illustration, and it goes without saying that those skilled in the art can use various methods without departing from the spirit and scope of the present invention. The described embodiments are modified. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims (10)

1. A vacuum interrupter contact structure, characterized in that it comprises, Static conductive rod; a static contact, which is arranged at the bottom end of the static conductive rod, and the static contact has a first diameter; a moving contact aligned with the stationary contact, the moving contact having a second diameter smaller than the first diameter; a moving conductive rod extending from an end of the moving contact away from the static contact; a longitudinal magnetic contact sleeved on the periphery of the movable contact and movable relative to the movable contact, the longitudinal magnetic contact having a hollow inner diameter of a second diameter and an outer diameter of a third diameter; The contact base extends from the end of the longitudinal magnetic contact away from the fixed contact, and the inner side of the end of the contact base away from the fixed contact is provided with a groove, and a spring contact abutting against the moving conductive rod is arranged in the groove. The finger, the contact base and the moving conductive rod form a parallel relationship so that the longitudinal magnetic contact and the moving contact are at the same potential and can move relatively. 2. The contact structure of vacuum interrupter according to claim 1, characterized in that, preferably, on the side walls of the static contact, the moving contact and the longitudinal magnetic contact, several inclined contacts are evenly distributed along the circumferential direction thereof. groove. 3. The contact structure of the vacuum interrupter according to claim 1, wherein the static contact and the moving contact are hollow structures. 4. The contact structure of the vacuum interrupter according to claim 1, wherein the third diameter is equal to the first diameter. 5. The contact structure of vacuum interrupter according to claim 1, characterized in that the height of the vertical magnetic contact is lower than that of the moving contact, and when the static contact is separated from the moving contact, the vertical magnetic contact and the moving contact are separated. The moving contacts are roughly at the same height. 6. The contact structure of the vacuum interrupter according to claim 1, wherein the longitudinal magnetic contact and the contact base are welded on the vacuum interrupter. 7. The vacuum interrupter contact structure according to claim 1, characterized in that the static contact is coaxially connected to the static conductive rod, the movable conductive rod is coaxially connected to the movable contact, and the contact base and the The longitudinal magnetic contacts are coaxially connected. 8. The contact structure of the vacuum interrupter according to claim 1, wherein the fixed contact, the moving contact and the longitudinal magnetic contact are coaxial. 9. The contact structure of the vacuum interrupter according to claim 1, characterized in that, contact pieces are provided on the contact surfaces of the static contacts and the movable contacts. 10. The contact structure of the vacuum interrupter according to claim 1, wherein the contact piece is provided with a through groove extending to the outer edge of the contact piece, and at least one inclined groove communicates with the through groove. groove.

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