阅读说明：本技术 真空灭弧室的主屏蔽罩及真空灭弧室 (Main shielding case of vacuum arc-extinguishing chamber and vacuum arc-extinguishing chamber ) 是由 刘世柏 李小钊 赵芳帅 薛从军 李锟 刘心悦 亓春伟 齐大翠 王宇浩 刘畅 姚新 于 2020-11-24 设计创作，主要内容包括：本发明涉及真空灭弧室的主屏蔽罩及真空灭弧室。真空灭弧室,包括：外壳,外壳设有两段,两段外壳沿真空灭弧室轴向对接；主屏蔽罩,用于包围在动触头和静触头的结合处的外侧；金属中封环,焊接固定在两段外壳之间,供主屏蔽罩焊接固定；所述主屏蔽罩为陶瓷材质；主屏蔽罩的外周面上设有金属化层；所述金属化层环绕主屏蔽罩的外周面设置,形成中封环连接部位,用于与真空灭弧室的两段外壳之间的金属中封环焊接固定以实现主屏蔽罩的固定。上述方案能够解决现有技术中的真空灭弧室绝缘性能受金属蒸气影响大而不利于小型化的问题。(The invention relates to a main shielding case of a vacuum arc-extinguishing chamber and the vacuum arc-extinguishing chamber. Vacuum interrupter, includes: the shell is provided with two sections which are in butt joint along the axial direction of the vacuum arc extinguish chamber; the main shielding cover is used for surrounding the outer side of the joint of the moving contact and the static contact; the metal middle sealing ring is welded and fixed between the two sections of shells and is used for welding and fixing the main shielding cover; the main shielding cover is made of ceramic materials; the peripheral surface of the main shielding cover is provided with a metallization layer; the metallized layer is arranged around the outer peripheral surface of the main shielding cover to form a middle seal ring connecting part which is used for being welded and fixed with a metal middle seal ring between two sections of shells of the vacuum arc-extinguishing chamber so as to realize the fixation of the main shielding cover. Above-mentioned scheme can be solved vacuum interrupter insulating properties among the prior art and receive metal vapor to influence greatly and be unfavorable for miniaturized problem.)

1. The main shielding cover (50) of the vacuum arc extinguish chamber is used for surrounding the outer side of the joint of the moving contact (45) and the static contact (34);

the shielding device is characterized in that the main shielding cover (50) is made of ceramic materials;

a metallization layer is arranged on the peripheral surface of the main shielding cover (50);

the metallized layer is arranged around the outer peripheral surface of the main shielding cover (50) to form a middle seal ring connecting part which is used for being welded and fixed with a metal middle seal ring (20) between two sections of shells (10) of the vacuum arc-extinguishing chamber so as to realize the fixation of the main shielding cover (50).

2. A main shield (50) according to claim 1, wherein the main shield (50) is provided with an annular protrusion (52) on its outer circumference, and the surface of the annular protrusion (52) is provided with the metallized layer.

3. A main shield shell (50) according to claim 1 or 2, wherein an inner wall surface of the main shield shell (50) is a flat wall surface in an axial direction of the main shield shell (50).

4. A main shield (50) according to claim 1 or 2, characterized in that a chamfer (51) is provided between the inner wall surface and the end surface of the main shield (50) and/or a chamfer (51) is provided between the outer peripheral surface and the end surface of the main shield (50).

5. Vacuum interrupter, includes:

the vacuum arc extinguishing chamber comprises a shell (10), wherein the shell (10) is provided with two sections, and the two sections of shells (10) are axially butted along the vacuum arc extinguishing chamber;

a main shield (50) for surrounding the outside of the junction of the moving contact (45) and the fixed contact (34);

the metal middle seal ring (20) is fixedly welded between the two sections of shells (10) and is used for fixedly welding the main shielding cover (50);

the shielding device is characterized in that the main shielding cover (50) is made of ceramic materials;

a metallization layer is arranged on the peripheral surface of the main shielding cover (50);

the metallized layer is arranged around the outer peripheral surface of the main shielding cover (50) to form a middle seal ring connecting part which is used for being welded and fixed with a metal middle seal ring (20) between two sections of shells (10) of the vacuum arc-extinguishing chamber so as to realize the fixation of the main shielding cover (50).

6. Vacuum interrupter according to claim 5, characterized in that the outer circumference of the main shield (50) is provided with an annular protrusion (52), the surface of the annular protrusion (52) being provided with the metallization layer.

7. Vacuum interrupter according to claim 6, characterized in that the cross section of the metal center seal ring (20) is an L-shaped structure comprising an axial extension (21) and a radial extension (22);

an axially extending portion (21) in nested engagement with the main shield (50);

the radial extension part (22) is welded and fixed between the two sections of shells (10) of the vacuum arc-extinguishing chamber;

the joint of the axial extension part (21) and the radial extension part (22) is matched with the annular bulge (52) in a stop way along the axial direction of the main shielding cover (50).

8. Vacuum interrupter according to claim 5 or 6 or 7, characterized in that the inner wall surface of the main shield (50) is a flat wall surface in the axial direction of the main shield (50).

9. Vacuum interrupter according to claim 5 or 6 or 7, characterized in that a chamfer (51) is provided between the inner wall surface and the end surface of the main shield (50) and/or that a chamfer (51) is provided between the outer circumferential surface and the end surface of the main shield (50).

10. Vacuum interrupter according to claim 5 or 6 or 7, characterized in that the cross-sectional profile of the annular protrusion (52) is arc-shaped.

Technical Field

The invention relates to a main shielding case of a vacuum arc-extinguishing chamber and the vacuum arc-extinguishing chamber.

Background

With the continuous development of the power industry and the improvement of the environmental protection requirements of the society, the vacuum arc-extinguishing chamber is developing towards the direction of high-voltage power transmission and distribution, and the switch equipment applying the vacuum arc-extinguishing chamber is also developing towards high voltage and miniaturization. The volume of the vacuum interrupter is an important factor for the overall volume of the switchgear, and therefore, high voltage and miniaturization of the vacuum interrupter are fundamental to miniaturization of the switchgear. However, as the voltage class is increased, the requirement for the internal insulation performance of the vacuum interrupter product is also increased.

The existing vacuum arc-extinguishing chamber is disclosed in Chinese patent document with publication number CN208548315U, and comprises a hollow shell, wherein a fixed contact component and a movable contact component are arranged at two axial ends of the shell, and a shielding cylinder is arranged in the middle of the shell in the axial direction. The static contact component comprises a static conducting rod and a static contact, the moving contact component comprises a moving conducting rod, a corrugated pipe and a moving contact, and the moving conducting rod is arranged in the guide sleeve in a guiding mode; the shell is a two-section structure spliced with each other, and the two sections of shells are fixedly connected through a middle seal ring; the shielding cylinder forms a main shielding cover which is used for surrounding the outer side of the joint of the moving contact and the static contact, and the outer peripheral surface of the main shielding cover is provided with an annular limiting bulge (namely, a limiting skirt edge in the patent document) which is used for being fixed on the middle seal ring and playing a role in balancing an electric field.

However, arcing can appear when the moving and static contacts are switched on and off, and the arcing can form metal vapor, and metal vapor adsorbs to and can weaken the internal wall of shell on the internal wall of shell afterwards along the axial insulating properties of explosion chamber to need the great insulating demand in meeting the vacuum arc extinguishing chamber of the axial dimension of explosion chamber, be unfavorable for the explosion chamber miniaturization, also can increase the installation space demand of corresponding switch product, lead to the cost higher.

Disclosure of Invention

The invention aims to provide a main shielding case of a vacuum arc-extinguishing chamber, which solves the problem that the insulation performance of the vacuum arc-extinguishing chamber in the prior art is greatly influenced by metal steam and is not beneficial to miniaturization. In addition, another object of the present invention is to provide a vacuum interrupter, which can be more easily miniaturized.

The main shielding cover of the vacuum arc-extinguishing chamber adopts the following technical scheme:

the main shielding cover of the vacuum arc extinguish chamber is used for surrounding the outer side of the joint of the moving contact and the fixed contact;

the main shielding cover is made of ceramic materials;

the peripheral surface of the main shielding cover is provided with a metallization layer;

the metallized layer is arranged around the outer peripheral surface of the main shielding cover to form a middle seal ring connecting part which is used for being welded and fixed with a metal middle seal ring between two sections of shells of the vacuum arc-extinguishing chamber so as to realize the fixation of the main shielding cover.

Has the advantages that: by adopting the technical scheme, the main shielding cover is made of ceramic materials, compared with the shielding cover made of metal materials in the prior art, the high-temperature resistant performance is better, metal steam can be prevented from being generated under the ablation of electric arc, so that the problem that the insulating performance of the vacuum arc extinguish chamber is greatly influenced by the metal steam is solved, and pores on the surface of the ceramic are beneficial to adsorbing the metal steam compared with the metal, so that the miniaturization of the vacuum arc extinguish chamber is facilitated; in addition, compared with the situation that the field intensity at two axial ends of the metal main shielding cover is larger, the main shielding cover made of ceramic materials can not cause the problem of large field intensity at two ends, is also favorable for reducing the axial size, and is particularly suitable for a vacuum arc-extinguishing chamber with low protection requirement on a radial electric field; moreover, through setting up the metallization layer, can conveniently realize the fixed of ceramic material's main shield cover on the shell, simple structure, it is convenient to make.

As a preferred technical scheme: the outer peripheral surface of the main shielding cover is provided with an annular bulge, and the surface of the annular bulge is provided with the metallization layer.

Has the advantages that: the metalized layer is arranged on the surface of the annular bulge, so that the annular bulge can be utilized to realize good axial positioning on the main shielding cover, the fixing reliability of the main shielding cover is improved, the structure is simple, and the manufacturing is convenient.

As a preferred technical scheme: the inner wall surface of the main shielding cover is a straight wall surface in the axial direction of the main shielding cover.

Has the advantages that: adopt above-mentioned technical scheme simple structure, be convenient for make.

As a preferred technical scheme: a chamfer is arranged between the inner wall surface and the end surface of the main shielding cover, and/or a chamfer is arranged between the outer peripheral surface and the end surface of the main shielding cover.

Has the advantages that: by adopting the technical scheme, the main shield cover can be conveniently manufactured, and the phenomenon that the edge of the main shield cover is easy to damage due to weak strength is avoided.

The vacuum arc-extinguishing chamber adopts the following technical scheme:

vacuum interrupter, includes:

the shell is provided with two sections which are in butt joint along the axial direction of the vacuum arc extinguish chamber;

the main shielding cover is used for surrounding the outer side of the joint of the moving contact and the static contact;

the metal middle sealing ring is welded and fixed between the two sections of shells and is used for welding and fixing the main shielding cover;

the main shielding cover is made of ceramic materials;

the peripheral surface of the main shielding cover is provided with a metallization layer;

the metallized layer is arranged around the outer peripheral surface of the main shielding cover to form a middle seal ring connecting part which is used for being welded and fixed with a metal middle seal ring between two sections of shells of the vacuum arc-extinguishing chamber so as to realize the fixation of the main shielding cover.

Has the advantages that: by adopting the technical scheme, the main shielding cover is made of ceramic materials, compared with the shielding cover made of metal materials in the prior art, the high-temperature resistant performance is better, metal steam can be prevented from being generated under the ablation of electric arc, so that the problem that the insulating performance of the vacuum arc extinguish chamber is greatly influenced by the metal steam is solved, and pores on the surface of the ceramic are beneficial to adsorbing the metal steam compared with the metal, so that the miniaturization of the vacuum arc extinguish chamber is facilitated; in addition, compared with the situation that the field intensity at two axial ends of the metal main shielding cover is larger, the main shielding cover made of ceramic materials can not cause the problem of large field intensity at two ends, is also favorable for reducing the axial size, and is particularly suitable for a vacuum arc-extinguishing chamber with low protection requirement on a radial electric field; moreover, through setting up the metallization layer, can conveniently realize the fixed of ceramic material's main shield cover on the shell, simple structure, it is convenient to make.

As a preferred technical scheme: the outer peripheral surface of the main shielding cover is provided with an annular bulge, and the surface of the annular bulge is provided with the metallization layer.

Has the advantages that: the metalized layer is arranged on the surface of the annular bulge, so that the annular bulge can be utilized to realize good axial positioning on the main shielding cover, the fixing reliability of the main shielding cover is improved, the structure is simple, and the manufacturing is convenient.

As a preferred technical scheme: the cross section of the metal middle seal ring is of an L-shaped structure and comprises an axial extension part and a radial extension part;

an axially extending portion in nested engagement with the primary shield;

the radial extension part is welded and fixed between the two sections of shells of the vacuum arc-extinguishing chamber;

the joint of the axial extension part and the radial extension part is matched with the annular bulge along the axial stop of the main shielding cover.

Has the advantages that: the axial extension part of the metal middle seal ring can play a role in radially positioning the main shield cover, and the axial positioning reliability of the main shield cover can be ensured by the stop matching of the joint of the axial extension part and the radial extension part and the main shield cover.

As a preferred technical scheme: the inner wall surface of the main shielding cover is a straight wall surface in the axial direction of the main shielding cover.

Has the advantages that: adopt above-mentioned technical scheme simple structure, be convenient for make.

As a preferred technical scheme: a chamfer is arranged between the inner wall surface and the end surface of the main shielding cover, and/or a chamfer is arranged between the outer peripheral surface and the end surface of the main shielding cover.

Has the advantages that: by adopting the technical scheme, the main shield cover can be conveniently manufactured, and the phenomenon that the edge of the main shield cover is easy to damage due to weak strength is avoided.

As a preferred technical scheme: the cross section of the annular bulge is arc-shaped.

Has the advantages that: the cross section profile of the annular bulge is arc-shaped, so that the annular bulge is not easy to damage and has good reliability.

For the subject to be protected by the present patent, each preferred technical solution under the same subject may be adopted alone, and when the preferred technical solutions under the same subject can be combined, two or more preferred technical solutions under the same subject may be arbitrarily combined, and the technical solutions formed by the combination are not specifically described here, and are included in the description of the present patent in this form.

Drawings

Fig. 1 is a schematic structural view of embodiment 1 of a vacuum interrupter in the present invention;

FIG. 2 is a schematic structural view of the main shield of FIG. 1;

FIG. 3 is an enlarged view of a portion of the junction of the main shield and the metal middle seal ring of FIG. 1;

the names of the components corresponding to the corresponding reference numerals in the drawings are: 10. a housing; 20. a metal middle seal ring; 21. an axially extending portion; 22. a radially extending portion; 31. a static cover plate; 32. a stationary end shield; 33. a static conductive rod; 34. static contact; 41. a movable cover plate; 42. a movable end shield cover; 43. a movable conductive rod; 44. a bellows; 45. a moving contact; 46. a guide sleeve; 50. a main shield case; 51. chamfering; 52. an annular protrusion.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, which may be present in the embodiments of the present invention, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, 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, method, article, or apparatus. Without further limitation, the statement that "comprises an … …" is intended to indicate that there are additional elements of the same process, method, article, or apparatus that comprise the element.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

In the description of the present invention, unless otherwise specifically stated or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be detachable or non-detachable. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

The present invention will be described in further detail with reference to examples.

Example 1 of the vacuum interrupter of the present invention:

as shown in fig. 1, the vacuum interrupter is a 126kv vacuum interrupter, and includes a hollow housing 10, the housing 10 is of an existing structure and made of ceramic material, the housing 10 is of a two-stage structure spliced with each other, and the two-stage housing 10 is fixedly connected through a metal middle seal ring 20. The two axial ends of the outer shell 10 are respectively provided with a static contact 34 component and a movable contact 45 component, and the middle part of the outer shell 10 in the axial direction is provided with a main shielding cover 50.

The static contact 34 assembly comprises a static cover plate 31, a static end shield cover 32, a static conducting rod 33 and a static contact 34, the static cover plate 31, the static end shield cover 32 and the static conducting rod 33 are welded and fixed together, and the static contact 34 is fixed on the static conducting rod 33.

The moving contact 45 assembly comprises a moving cover plate 41 and a moving end shield 42, and further comprises a moving conducting rod 43, a corrugated pipe 44 and a moving contact 45, wherein the moving conducting rod 43 is arranged in a guide sleeve 46 in a guiding mode, the guide sleeve 46 is fixed on the moving cover plate 41, and the moving contact 45 is fixed on the moving conducting rod 43.

The shell 10, the static contact 34 assembly and the movable contact 45 assembly can all adopt the structure of a vacuum arc-extinguishing chamber in the prior art.

As shown in fig. 1 and 2, the main shield 50 is used to surround the outside of the joint of the movable contact 45 and the fixed contact 34, and is made of ceramic, which may be the same as the material of the housing 10. The main shield cover 50 is of a straight-tube structure, the inner wall surface is a straight wall surface in the axial direction of the main shield cover 50, an annular protrusion 52 is arranged in the middle of the outer peripheral surface in the axial direction, a metalized layer is arranged on the surface of the annular protrusion 52, the metalized layer is arranged around the outer peripheral surface of the main shield cover 50 to form a middle seal ring connecting part, and the middle seal ring connecting part is used for being welded and fixed with the metal middle seal ring 20 between the two sections of shells 10 of the vacuum arc extinguish chamber, so that the main shield cover 50 is fixed. The metallization layer is formed by ceramic metallization, which is prior art and will not be described in detail here. For convenience of manufacture and avoidance of damage, the cross-sectional profile of the annular protrusion 52 is arc-shaped, and meanwhile, a chamfer 51 is provided between the inner wall surface and the end surface of the main shield 50, and a chamfer 51 is also provided between the outer peripheral surface and the end surface of the main shield 50.

As shown in fig. 1 and 3, the cross section of the metal middle seal ring 20 is an L-shaped structure, and includes an axial extension portion 21 and a radial extension portion 22; the axial extension part 21 forms a plug-in fit with the main shield 50, and the radial extension part 22 is welded and fixed between the two sections of the shell 10 of the vacuum arc-extinguishing chamber. The joint of the axial extension 21 and the radial extension 22 cooperates with the annular protrusion 52 in a stop manner along the axial direction of the main shield 50, so that the main shield 50 can be axially positioned. In addition, the surface of the metal middle seal ring 20 is plated with silver, so that the metal middle seal ring can be better welded and fixed with the shell 10 and the main shield 50.

During manufacturing, the corresponding parts are positioned by using a tool clamp, and then the corresponding parts are integrally brazed into a whole by using a vacuum brazing process; and finally, the guide sleeve 46 is installed, so that the assembly of the vacuum arc-extinguishing chamber of the ceramic main shielding case 50 is realized, the production and manufacturing cost is low, the part structure is simple, the realization is easy, and the method is suitable for batch production.

When the switch is in operation, the ceramic main shielding case 50 can absorb electric arc well, prevent the metal shielding case from generating metal vapor under the action of the electric arc, adsorb the metal vapor generated by the moving contact 45 and the static contact 34, and reduce the amount of the metal vapor adsorbed on the inner wall surface of the shell 10, thereby improving the insulation performance of the inner wall surface of the shell 10 along the axial direction of the arc extinguish chamber, being beneficial to reducing the volume of the vacuum arc extinguish chamber, saving the installation space of corresponding switch products, and providing a direction for the miniaturization and cost reduction of the switch products.

Example 2 of the vacuum interrupter of the present invention:

the difference between this embodiment and embodiment 1 is that in embodiment 1, an annular protrusion 52 is disposed on the outer peripheral surface of the main shield 50, and a metalized layer is disposed on the surface of the annular protrusion 52, whereas in this embodiment, the outer peripheral surface of the main shield 50 is a flat surface and is directly welded to the metal middle seal ring 20.

The embodiment of the main shielding cover of the vacuum arc-extinguishing chamber in the invention comprises the following steps: the embodiment of the main shield cover of the vacuum interrupter, that is, the main shield cover 50 described in any of the above embodiments of the vacuum interrupter, will not be described in detail here.

The above description is only a preferred embodiment of the present application, and not intended to limit the present application, the scope of the present application is defined by the appended claims, and all changes in equivalent structure made by using the contents of the specification and the drawings of the present application should be considered as being included in the scope of the present application.