阅读说明：本技术 真空灭弧室的外壳及真空灭弧室 (Vacuum interrupter's shell and vacuum interrupter ) 是由 李小钊 赵芳帅 刘世柏 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外壳及真空灭弧室。真空灭弧室,包括：外壳,外壳上装配有动触头和静触头；所述外壳包括：外壳主体,所述外壳主体为筒状结构,由陶瓷材质制成；陶瓷屏蔽筒,设置在外壳主体的内部,其轴向中部为主体连接部分,主体连接部分与外壳主体连为一体；陶瓷屏蔽筒还包括端部部分,端部部分位于主体连接部分的轴向两侧,所述端部部分的外周面与外壳主体的内壁面之间具有间隔；所述陶瓷屏蔽筒位于外壳主体的轴向中部,包围在动触头和静触头的结合处的外侧。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 shell of a vacuum arc-extinguishing chamber and the vacuum arc-extinguishing chamber. Vacuum interrupter, includes: the moving contact and the static contact are assembled on the shell; the housing includes: the shell main body is of a cylindrical structure and is made of ceramic materials; the ceramic shielding cylinder is arranged in the shell main body, the axial middle part of the ceramic shielding cylinder is a main body connecting part, and the main body connecting part and the shell main body are connected into a whole; the ceramic shielding cylinder further includes end portions located on both axial sides of the main body connecting portion, the outer peripheral surfaces of the end portions having a space from the inner wall surface of the housing main body; the ceramic shielding cylinder is positioned in the axial middle of the shell main body and surrounds the outer side of the joint of the moving contact and the static contact. 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. A housing (10) of the vacuum interrupter for enclosing a vacuum chamber; it is characterized in that the preparation method is characterized in that,

the housing (10) comprises:

the shell main body (11), the shell main body (11) is a cylindrical structure and is made of ceramic materials;

the ceramic shielding cylinder (12) is arranged in the shell main body (11), the axial middle part of the ceramic shielding cylinder is provided with a main body connecting part (13), and the main body connecting part (13) is connected with the shell main body (11) into a whole;

the ceramic shielding cylinder (12) further comprises end parts (14), the end parts (14) are positioned on two axial sides of the main body connecting part (13), and a gap (20) is formed between the outer peripheral surface of each end part (14) and the inner wall surface of the shell main body (11);

the ceramic shielding cylinder (12) is positioned in the axial middle of the shell main body (11) and used for surrounding the outer side of the joint of the movable contact (45) and the fixed contact (34) when in use.

2. The vacuum interrupter housing (10) of claim 1 characterized in that the connection of the ceramic shielding cylinder (12) to the housing body (11) forms a semi-circular arc shaped bottom (21) at the inner end of the gap (20).

3. The housing (10) of the vacuum interrupter as claimed in claim 1 or 2, characterized in that the dimension of the connection between the ceramic shielding cylinder (12) and the housing body (11) is greater than 1/3 of the overall dimension of the ceramic shielding cylinder (12) in the axial direction of the housing (10).

4. The housing (10) of the vacuum interrupter as claimed in claim 1 or 2, characterized in that the inner wall surface of the ceramic shielding cylinder (12) is a flat wall surface in the axial direction of the ceramic shielding cylinder (12).

5. The housing (10) of the vacuum interrupter as claimed in claim 1 or 2, characterized in that a chamfer is provided between the inner wall surface and the end surface of the ceramic shielding cylinder (12) and/or a chamfer is provided between the outer circumferential surface and the end surface of the ceramic shielding cylinder (12).

6. Vacuum interrupter, includes:

the device comprises a shell (10), wherein a movable contact (45) and a fixed contact (34) are assembled on the shell (10);

characterized in that the housing (10) comprises:

the shell main body (11), the shell main body (11) is a cylindrical structure and is made of ceramic materials;

the ceramic shielding cylinder (12) is arranged in the shell main body (11), the axial middle part of the ceramic shielding cylinder is provided with a main body connecting part (13), and the main body connecting part (13) is connected with the shell main body (11) into a whole;

the ceramic shielding cylinder (12) further comprises end parts (14), the end parts (14) are positioned on two axial sides of the main body connecting part (13), and a gap (20) is formed between the outer peripheral surface of each end part (14) and the inner wall surface of the shell main body (11);

the ceramic shielding cylinder (12) is positioned in the axial middle of the shell main body (11) and surrounds the outer side of the joint of the moving contact (45) and the static contact (34).

7. Vacuum interrupter according to claim 6, characterized in that the connection of the ceramic shielding cylinder (12) to the housing body (11) forms a semi-circular arc shaped bottom (21) at the inner end of the gap (20).

8. Vacuum interrupter according to claim 6 or 7, characterized in that the dimension of the connection between the ceramic shielding canister (12) and the housing body (11) in the axial direction of the housing (10) is larger than 1/3 of the overall dimension of the ceramic shielding canister (12).

9. The vacuum interrupter according to claim 6 or 7, characterized in that the inner wall surface of the ceramic shielding cylinder (12) is a flat wall surface in the axial direction of the ceramic shielding cylinder (12).

10. The vacuum interrupter according to claim 6 or 7, characterized in that a chamfer is provided between the inner wall surface and the end surface of the ceramic shielding cylinder (12) and/or a chamfer is provided between the outer circumferential surface and the end surface of the ceramic shielding cylinder (12).

Technical Field

The invention relates to a shell 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 shell 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 shell of the vacuum arc-extinguishing chamber adopts the following technical scheme:

the shell of the vacuum arc-extinguishing chamber is used for enclosing a vacuum chamber;

the housing includes:

the shell main body is of a cylindrical structure and is made of ceramic materials;

the ceramic shielding cylinder is arranged in the shell main body, the axial middle part of the ceramic shielding cylinder is a main body connecting part, and the main body connecting part and the shell main body are connected into a whole;

the ceramic shielding cylinder further includes end portions located on both axial sides of the main body connecting portion, the outer peripheral surfaces of the end portions having a space from the inner wall surface of the housing main body;

the ceramic shielding cylinder is positioned in the axial middle of the shell main body and used for surrounding the outer side of the joint of the moving contact and the static contact when in use.

Has the advantages that: by adopting the technical scheme, compared with a metal shielding cover in the prior art, the ceramic shielding cylinder has better high-temperature resistance, can avoid generating metal steam under the ablation of electric arc, thereby improving the problem that the insulating property of the vacuum arc-extinguishing chamber is greatly influenced by the metal steam, and the pores on the surface of the ceramic are beneficial to adsorbing the metal steam compared with the metal, thereby being beneficial to the miniaturization of the vacuum arc-extinguishing chamber; 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; in addition, the main body connecting part of the ceramic shielding cylinder is connected with the shell main body into a whole, a shielding cylinder fixing structure is not required to be additionally arranged, the structure is simple, and the manufacture is convenient.

As a preferred technical scheme: the connection part of the ceramic shielding cylinder and the shell main body forms a semi-circular arc bottom at the inner end of the interval.

Has the advantages that: by adopting the technical scheme, stress concentration is avoided, and the manufacturing is facilitated.

As a preferred technical scheme: in the axial direction of the housing, the dimension of the connecting part between the ceramic shielding cylinder and the housing main body is greater than 1/3 of the overall dimension of the ceramic shielding cylinder.

Has the advantages that: by adopting the technical scheme, the connection strength of the ceramic shielding cylinder is favorably ensured.

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

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 ceramic shielding cylinder, and/or a chamfer is arranged between the outer peripheral surface and the end surface of the ceramic shielding cylinder.

Has the advantages that: by adopting the technical scheme, the ceramic shielding cylinder can be conveniently manufactured, and the phenomenon that the edge of the ceramic shielding cylinder is weak in strength and easy to damage is avoided.

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

vacuum interrupter, includes:

the moving contact and the static contact are assembled on the shell;

the housing includes:

the shell main body is of a cylindrical structure and is made of ceramic materials;

the ceramic shielding cylinder is arranged in the shell main body, the axial middle part of the ceramic shielding cylinder is a main body connecting part, and the main body connecting part and the shell main body are connected into a whole;

the ceramic shielding cylinder further includes end portions located on both axial sides of the main body connecting portion, the outer peripheral surfaces of the end portions having a space from the inner wall surface of the housing main body;

the ceramic shielding cylinder is positioned in the axial middle of the shell main body and surrounds the outer side of the joint of the moving contact and the static contact.

Has the advantages that: by adopting the technical scheme, compared with a metal shielding cover in the prior art, the ceramic shielding cylinder has better high-temperature resistance, can avoid generating metal steam under the ablation of electric arc, thereby improving the problem that the insulating property of the vacuum arc-extinguishing chamber is greatly influenced by the metal steam, and the pores on the surface of the ceramic are beneficial to adsorbing the metal steam compared with the metal, thereby being beneficial to the miniaturization of the vacuum arc-extinguishing chamber; 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; in addition, the main body connecting part of the ceramic shielding cylinder is connected with the shell main body into a whole, a shielding cylinder fixing structure is not required to be additionally arranged, the structure is simple, and the manufacture is convenient.

As a preferred technical scheme: the connection part of the ceramic shielding cylinder and the shell main body forms a semi-circular arc bottom at the inner end of the interval.

Has the advantages that: by adopting the technical scheme, stress concentration is avoided, and the manufacturing is facilitated.

As a preferred technical scheme: in the axial direction of the housing, the dimension of the connecting part between the ceramic shielding cylinder and the housing main body is greater than 1/3 of the overall dimension of the ceramic shielding cylinder.

Has the advantages that: by adopting the technical scheme, the connection strength of the ceramic shielding cylinder is favorably ensured.

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

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 ceramic shielding cylinder, and/or a chamfer is arranged between the outer peripheral surface and the end surface of the ceramic shielding cylinder.

Has the advantages that: by adopting the technical scheme, the ceramic shielding cylinder can be conveniently manufactured, and the phenomenon that the edge of the ceramic shielding cylinder is weak in strength and easy to damage is avoided.

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 housing of FIG. 1;

the names of the components corresponding to the corresponding reference numerals in the drawings are: 10. a housing; 11. a housing main body; 12. a ceramic shielding cylinder; 13. a main body connection part; 14. an end portion; 20. spacing; 21. a semi-circular arc bottom; 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. and a guide sleeve.

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 cylindrical housing 10, and a fixed contact assembly and a movable contact assembly are respectively disposed at two axial ends of the housing 10.

As shown in fig. 2, the housing 10 is made of a ceramic material, and includes a housing main body 11 and a ceramic shielding cylinder 12, the housing main body 11 and the ceramic shielding cylinder 12 are integrally formed, and the ceramic shielding cylinder 12 is disposed inside the housing main body 11, is located in an axial middle portion of the housing main body 11, and surrounds an outer side of a joint of the movable contact 45 and the stationary contact 34. The ceramic shielding cylinder 12 is divided into a main body connecting part 13 and an end part 14, and the main body connecting part 13 is positioned in the axial middle part of the ceramic shielding cylinder 12 and is connected with the shell main body 11 into a whole; the end portions 14 are located on both sides of the main body connecting portion 13 in the axial direction, and the outer peripheral surface of the end portion 14 has a space 20 from the inner wall surface of the casing main body 11 for avoiding formation of a continuous metal vapor layer on the inner wall of the casing 10. In order to secure the connection strength of the ceramic shield cylinder 12, the dimension of the connection portion between the ceramic shield cylinder 12 and the housing main body 11 in the axial direction of the housing 10 is larger than 1/3 of the entire dimension of the ceramic shield cylinder 12.

As shown in fig. 1, the static contact assembly includes a static cover plate 31, a static end shield 32, a static conductive rod 33, and a static contact 34, where the static cover plate 31, the static end shield 32, and the static conductive rod 33 are welded and fixed together, and the static contact 34 is fixed on the static conductive rod 33.

The moving contact 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 static contact assembly and the moving contact assembly can adopt the structure of a vacuum arc extinguish chamber in the prior art.

The ceramic shielding cylinder 12 has a straight cylinder structure, and the inner wall surface is a straight wall surface in the axial direction of the ceramic shielding cylinder 12. In order to facilitate manufacturing and avoid damage, a chamfer is provided between the inner wall surface and the end surface of the ceramic shielding cylinder 12, and a chamfer is also provided between the outer peripheral surface and the end surface of the main shielding cover.

During manufacturing, the corresponding parts are positioned by using a tool fixture, and then the corresponding parts are integrally brazed into a whole by using a vacuum brazing process, and the shell 10 and the shielding case are of an integral structure, so that the number of the parts is small, and the assembly and the manufacturing are convenient; and finally, the guide sleeve 46 is installed, so that the assembly of the vacuum arc extinguish chamber of the ceramic main shield cover 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 work, the main shielding cover made of ceramic materials can better absorb electric arcs, the metal shielding cover is prevented from generating metal vapor under the action of the electric arcs, the metal vapor generated by the moving contact 45 and the static contact 34 can be adsorbed, the amount of the metal vapor adsorbed on the inner wall surface of the shell 10 is reduced, the insulation performance of the inner wall surface of the shell 10 along the axial direction of the arc extinguish chamber is improved, the size of the vacuum arc extinguish chamber is favorably reduced, the installation space of corresponding switch products is saved, and a direction is provided for the miniaturization and cost reduction of the switch products.

Embodiment of the housing of the vacuum interrupter of the invention: the embodiment of the housing of the vacuum interrupter, i.e. the housing 10 described in any of the above embodiments of the vacuum interrupter, is not 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.