Vacuum arc-extinguishing chamber and isolating switch

Abstract

The utility model discloses a vacuum arc-extinguishing chamber and an isolating switch, and belongs to the low-voltage electrical field. The vacuum arc-extinguishing chamber comprises a ceramic tube, an end cover structure, a shielding tube, a movable conducting rod and a static conducting rod, the ceramic tube and the shielding tube are distributed at intervals in the axial direction of the shielding tube, the end cover structure is located between the ceramic tube and the shielding tube, the movable conducting rod penetrates through the ceramic tube and extends into the shielding tube, and at least part of the static conducting rod extends into the shielding tube; the end cover structure comprises a welding section, a positioning section and an extending section which are connected in sequence, a first included angle is formed between the welding section and the positioning section, the positioning section extends in the axial direction of the shielding pipe, the welding section is located between the ceramic pipe and the shielding pipe, and the welding section is connected with the ceramic pipe and the shielding pipe; the positioning section and at least part of the extension section are located in the shielding tube, a through hole is formed in the extension section, and the movable conducting rod penetrates through the through hole.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of low-voltage electrical appliances, and particularly relates to a vacuum arc-extinguishing chamber and a disconnecting switch. BACKGROUND

[0002] Generally, a vacuum arc-extinguishing chamber needs to be used in a disconnecting switch. The vacuum arc-extinguishing chamber comprises a ceramic tube, a shielding tube, a moving conducting rod and a static conducting rod, the moving conducting rod is connected with a moving contact, the static conducting rod is connected with a static contact, and the static contact is correspondingly matched with the moving contact. When the current is disconnected, a large amount of metal vapor is generated between the moving contact and the static contact, which is adsorbed on the inner wall of the ceramic shell, causing insulation failure. In order to avoid the problem of insulation failure, a shielding cover and a baffle are usually arranged to block the metal vapor. However, the arrangement of the shielding cover and the baffle and other components leads to a large volume of the vacuum arc-extinguishing chamber and a complex structure of the vacuum arc-extinguishing chamber. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the embodiments of the present application is to provide a vacuum arc-extinguishing chamber and a disconnecting switch, which at least solve the problems of a large volume of the vacuum arc-extinguishing chamber and a complex structure of the vacuum arc-extinguishing chamber.

[0004] In a first aspect, the embodiments of the present application provide a vacuum arc-extinguishing chamber, which comprises a ceramic tube, an end cover structure, a shielding tube, a moving conducting rod and a static conducting rod.

[0005] The ceramic tube and the shielding tube are spaced apart along the axial direction of the shielding tube, the end cover structure is located between the ceramic tube and the shielding tube, the moving conducting rod penetrates the ceramic tube and extends into the shielding tube, and at least part of the static conducting rod extends into the shielding tube.

[0006] The end cover structure comprises a welding segment, a positioning segment and an extension segment connected in sequence, the welding segment and the positioning segment have a first included angle, the positioning segment extends along the axial direction of the shielding tube, the welding segment is located between the ceramic tube and the shielding tube, and the welding segment is connected with the ceramic tube and the shielding tube respectively, the positioning segment and at least part of the extension segment are located in the shielding tube, the extension segment is provided with a through hole, and the moving conducting rod penetrates the through hole.

[0007] Optionally, the positioning segment comprises a first positioning sub-segment and a second positioning sub-segment connected in sequence, the first positioning sub-segment is connected with the welding segment, the first positioning sub-segment and the welding segment have the first included angle, the first positioning sub-segment extends along the axial direction of the shielding tube, the first positioning sub-segment is in contact with the inner wall of the shielding tube, and the second positioning sub-segment is connected with the extension segment.

[0008] Optionally, the second positioning sub-section and the first positioning sub-section have a second included angle, and the second included angle ranges from 40° to 50°.

[0009] Optionally, a cross section of the first positioning sub-section, a cross section of the second positioning sub-section, and a cross section of the extending section form an S-shaped cross section.

[0010] Optionally, the positioning section includes a third positioning sub-section, one end of the third positioning sub-section is connected to the welding section, the other end of the third positioning sub-section is connected to the extending section, the third positioning sub-section extends along an axial direction of the shielding tube, and the third positioning sub-section is in contact with an inner wall of the shielding tube.

[0011] The third positioning sub-section and the welding section have the first included angle.

[0012] Optionally, the extending section includes a first curved section and a second curved section connected to each other.

[0013] The first curved section is connected to the third positioning sub-section, a notch of the first curved section faces the ceramic tube, and a notch of the second curved section faces the welding section.

[0014] Optionally, the welding section, the positioning section, and the extending section are integrally formed.

[0015] Optionally, the vacuum interrupter further includes a guide sleeve and a sealing ring.

[0016] The sealing ring is connected to an end of the ceramic tube away from the shielding tube, the sealing ring is provided with a mounting hole, part of the guide sleeve is connected to the mounting hole, and the movable contact rod passes through the guide sleeve and the mounting hole.

[0017] Optionally, the vacuum interrupter further includes a bellows, the bellows is sleeved on the movable contact rod, the bellows is located inside the ceramic tube, and a first end of the bellows abuts against the sealing ring.

[0018] Optionally, the movable contact rod is provided with a positioning structure, a second end of the bellows is matched with the positioning structure, and the positioning structure positions the second end of the bellows.

[0019] In a second aspect, an embodiment of the present application provides an isolating switch, the isolating switch including the vacuum interrupter of any one of the first aspect.

[0020] The vacuum interrupter provided by the embodiment of the present application has at least the following beneficial effects:

[0021] 1. In the embodiment of the present application, the end cover structure is provided to include a welding section, a positioning section and an extension section connected in sequence, the welding section is connected with the ceramic tube and the shielding tube respectively, the positioning section and at least part of the extension section are located in the shielding tube, the extension section is provided with a through hole, and the movable contact rod passes through the through hole, so that not only the welding stress can be buffered by the welding section to avoid the problem that the ceramic tube may be cracked due to the large stress at the welding position, but also the metal vapor generated between the movable contact and the static contact is blocked by the positioning section and the extension section of the end cover structure to avoid the metal vapor being adsorbed on the inner wall of the ceramic tube, that is, the end cover structure integrates the functions of the shielding cover and the baffle, that is, the end cover structure has the function of pressure equalization, and the electric field distribution of the vacuum arc-extinguishing chamber can be optimized, so that the shielding cover, the baffle and other components can be avoided to be arranged, so that the internal space of the vacuum arc-extinguishing chamber can be sufficient, so as to enhance the withstand voltage performance of the vacuum arc-extinguishing chamber, and the parts of the vacuum arc-extinguishing chamber are reduced, which is helpful to improve the assembly efficiency of the vacuum arc-extinguishing chamber and reduce the cost of the vacuum arc-extinguishing chamber, and the volume of the vacuum arc-extinguishing chamber can be small, and the structure of the vacuum arc-extinguishing chamber is simplified.

[0022] 2. The positioning section includes a first positioning sub-section and a second positioning sub-section connected in sequence, the first positioning sub-section is connected with the welding section, and the first positioning sub-section and the welding section have a first included angle therebetween, the first positioning sub-section extends along the axial direction of the shielding tube, the first positioning sub-section is in contact with the inner wall of the shielding tube, and the second positioning sub-section is connected with the extension section. By providing the first positioning sub-section and the second positioning sub-section, the shielding tube is positioned by the first positioning sub-section and the ceramic tube is positioned by the second positioning sub-section during the assembly of the vacuum arc-extinguishing chamber, so that the coaxiality of the vacuum arc-extinguishing chamber is guaranteed, that is, the coaxiality of the shielding tube and the ceramic tube is guaranteed, and the product performance of the vacuum arc-extinguishing chamber is improved.

[0023] 3. The extension section includes a first curved section and a second curved section connected in sequence; the first curved section is connected with the third positioning sub-section, the notch of the first curved section faces the ceramic tube, and the notch of the second curved section faces the welding section. By such a setting, the presence of the first curved section and the second curved section can improve the pressure equalization capability of the extension section, which is helpful to the pressure equalization of the end cover structure, and only by providing the first curved section and the second curved section, the structure of the extension section can be relatively simple, which is convenient for processing the end cover structure. In addition, the first curved section and the second curved section can further play a role in improving the electric field distribution of the vacuum arc-extinguishing chamber to avoid the problem that the vacuum arc-extinguishing chamber may have external flicker. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 shows a cross-sectional view of a vacuum arc-extinguishing chamber provided by an embodiment of the present application;

[0025] Figure 2 shows Figure 1 a local enlarged view at A in FIG. 4.

[0026] Figure 3 a schematic diagram of an S-shaped end cover structure provided by an embodiment of the present application is shown;

[0027] Figure 4 a sectional view of the S-shaped end cover structure provided by an embodiment of the present application is shown;

[0028] Figure 5 a sectional view of a vacuum interrupter provided by an embodiment of the present application is shown;

[0029] Figure 6 a sectional view of a vacuum interrupter provided by an embodiment of the present application is shown; Figure 5 an enlarged view of a part B is shown;

[0030] Figure 7 a schematic diagram of a spoon-shaped end cover structure provided by an embodiment of the present application is shown;

[0031] Figure 8 a sectional view of the spoon-shaped end cover structure provided by an embodiment of the present application is shown;

[0032] Figure 9 a schematic diagram of a shield tube provided by an embodiment of the present application is shown;

[0033] Figure 10 a sectional view of the shield tube provided by an embodiment of the present application is shown.

[0034] Reference signs:

[0035] 10: ceramic tube; 20: end cover structure; 21: welding section; 22: positioning section; 23: extension section; 24: through hole; 221: first positioning sub-section; 222: second positioning sub-section; 223: third positioning sub-section; 231: first bending section; 232: second bending section; 30: shield tube; 301: through hole; 40: movable conducting rod; 41: positioning structure; 401: movable contact; 50: stationary conducting rod; 501: stationary contact; 60: guide sleeve; 70: sealing ring; 80: bellows; a: first included angle; b: second included angle. DETAILED DESCRIPTION

[0036] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0037] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0038] In the description of the present application, it needs to be understood that the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] As shown in Figure 1 and Figure 10 The vacuum arc-extinguishing chamber comprises a ceramic tube 10, an end cover structure 20, a shield tube 30, a moving conducting rod 40, and a static conducting rod 50.

[0040] The ceramic tube 10 and the shield tube 30 are spaced apart along the axial direction of the shield tube 30, the end cover structure 20 is located between the ceramic tube 10 and the shield tube 30, the moving conducting rod 40 penetrates the ceramic tube 10 and extends into the shield tube 30, and at least part of the static conducting rod 50 extends into the shield tube 30; the end cover structure 20 comprises a welding section 21, a positioning section 22 and an extension section 23 connected in sequence, the welding section 21 and the positioning section 22 have a first included angle a, the positioning section 22 extends along the axial direction of the shield tube 30, the welding section 21 is located between the ceramic tube 10 and the shield tube 30, and the welding section 21 is connected with the ceramic tube 10 and the shield tube 30 respectively, the positioning section 22 and at least part of the extension section 23 are located in the shield tube 30, the extension section 23 is provided with a through hole 24, and the moving conducting rod 40 penetrates the through hole 24.

[0041] In the embodiment of the present application, the movable conducting rod 40 is arranged through the ceramic tube 10 and extends into the shielding tube 30, and at least part of the static conducting rod 50 extends into the shielding tube 30, so that once the movable conducting rod 40 is connected to the movable contact 401 and the static conducting rod 50 is connected to the static contact 501, the static contact 501 and the movable contact 401 are both located inside the shielding tube 30, that is, the movable contact 401 and the static contact 501 are correspondingly matched inside the shielding tube 30. Since the first included angle a is formed between the welding section 21 and the positioning section 22, the positioning section 22 extends along the axial direction of the shielding tube 30, the welding section 21 is located between the ceramic tube 10 and the shielding tube 30, and the welding section 21 is connected to the ceramic tube 10 and the shielding tube 30 respectively, so that the ceramic tube 10 and the shielding tube 30 can be directly connected, that is, the shielding tube 30 and the ceramic tube 10 do not need to be directly welded and fixed, so that when the welding section 21 is used to connect the ceramic tube 10 and the shielding tube 30 respectively, the welding stress buffering can be performed by using the welding section 21, and the problem of possible porcelain cracking of the ceramic tube 10 caused by large welding stress can be avoided. In addition, the positioning section 22 and at least part of the extension section 23 are located in the shielding tube 30, the through hole 24 is arranged on the extension section 23, and the movable conducting rod 40 is arranged through the through hole 24, so that the static contact 501 and the movable contact 401 are located on the side of the positioning section 22 away from the ceramic tube 10, so that the positioning section 22 and the extension section 23 can block the metal vapor generated between the movable contact 401 and the static contact 501, and the problem of insulation failure caused by the metal vapor entering the ceramic tube 10 and adhering to the inner wall of the ceramic tube 10 can be avoided.

[0042] That is, in the embodiment of the present application, the end cover structure 20 includes the welding section 21, the positioning section 22 and the extension section 23 connected in sequence, the welding section 21 is connected to the ceramic tube 10 and the shielding tube 30 respectively, the positioning section 22 and at least part of the extension section 23 are located in the shielding tube 30, the through hole 24 is arranged on the extension section 23, and the movable conducting rod 40 is arranged through the through hole 24, so that not only the welding stress buffering can be performed by using the welding section 21 to avoid the problem of possible porcelain cracking of the ceramic tube 10 caused by large welding stress, but also the metal vapor generated between the movable contact 401 and the static contact 501 can be blocked by the positioning section 22 and the extension section 23 of the end cover structure 20 to avoid the metal vapor being adsorbed on the inner wall of the ceramic tube 10, that is, the end cover structure 20 integrates the functions of the shielding cover and the baffle, that is, the end cover structure 20 has the function of pressure equalization, and the electric field distribution of the vacuum arc-extinguishing chamber can be optimized, so that the shielding cover, the baffle and other components can be avoided, so that the internal space of the vacuum arc-extinguishing chamber can be large enough, so as to enhance the withstand voltage performance of the vacuum arc-extinguishing chamber, and the parts of the vacuum arc-extinguishing chamber are reduced, which is helpful to improve the assembly efficiency of the vacuum arc-extinguishing chamber and reduce the cost of the vacuum arc-extinguishing chamber, and the volume of the vacuum arc-extinguishing chamber can be small, and the structure of the vacuum arc-extinguishing chamber can be simplified.

[0043] In addition, in the embodiment of the present application, by setting the end cover structure 20, the end cover structure 20 can optimize the electric field distribution of the vacuum interrupter, that is, the electric field concentration degree of the ceramic tube 10 near one end of the shielding tube 30 can be reduced, thereby reducing the probability of occurrence of external flicker of the vacuum interrupter.

[0044] It should be noted that in the embodiment of the present application, the first included angle a can be 90°, of course, the first included angle a can also be other values, for example, the first included angle a is 95°, and for example, the first included angle a is 100°. For the specific value of the first included angle a, the embodiment of the present application is not limited here.

[0045] In addition, in the embodiment of the present application, the positioning section 22 can position the shielding tube 30, thereby ensuring the coaxiality of the shielding tube 30 and the ceramic tube 10 when assembling the vacuum interrupter.

[0046] In addition, in the embodiment of the present application, the material of the end cover structure 20 can be oxygen-free copper material, and the material of the shielding tube 30 can be stainless steel. The expansion coefficient of oxygen-free copper is close to that of the ceramic tube 10, so that the welding stress when the welding section 21 of the end cover structure 20 is welded with the ceramic tube 10 is smaller than the welding stress when the shielding tube 30 is welded with the ceramic tube 10, thereby when the welding section 21 is welded with the ceramic tube 10 and the shielding tube 30 respectively, the welding stress can be buffered through the welding section 21, effectively avoiding the problem that the ceramic tube 10 is cracked due to large stress at the welding position.

[0047] In addition, in some embodiments, as Figure 1 , Figure 2 and Figure 4As shown, the positioning section 22 comprises a first positioning sub-section 221 and a second positioning sub-section 222 connected in sequence, the first positioning sub-section 221 is connected with the welding section 21, and the first positioning sub-section 221 and the welding section 21 have a first included angle a, the first positioning sub-section 221 extends along the axial direction of the shielding tube 30, the first positioning sub-section 221 is in contact with the inner wall of the shielding tube 30, and the second positioning sub-section 222 is connected with the extending section 23. Through such a setting, in the process of assembling the vacuum interrupter, the shielding tube 30 can be sleeved on the positioning section 22, and the ceramic tube 10 is placed on one side of the welding section 21, so that the first positioning sub-section 221 is in contact with the inner wall of the shielding tube 30, and the first positioning sub-section 221 can position the shielding tube 30, and the second positioning sub-section 222 can position the ceramic tube 10, so that the coaxiality of the shielding tube 30 and the ceramic tube 10 is ensured. That is, by setting the first positioning sub-section 221 and the second positioning sub-section 222, in the process of assembling the vacuum interrupter, the shielding tube 30 is positioned by the first positioning sub-section 221, and the ceramic tube 10 is positioned by the second positioning sub-section 222, so that the coaxiality of the vacuum interrupter is ensured, that is, the coaxiality of the shielding tube 30 and the ceramic tube 10 is ensured, and the product performance of the vacuum interrupter is improved.

[0048] It should be noted that the end of the ceramic tube 10 close to the shielding tube 30 has a chamfer, and in the process of assembling the vacuum interrupter, the first positioning sub-section 221 positions the shielding tube 30, and the second positioning sub-section 222 positions the chamfer position of the ceramic tube 10.

[0049] In addition, in the embodiment of the present application, the first positioning sub-section 221 can be perpendicular to the welding section 21, that is, the first included angle a between the first positioning sub-section 221 and the welding section 21 is 90°, at this time, after the shielding tube 30 is sleeved on the positioning section 22 in the process of assembling the vacuum interrupter, the end of the shielding tube 30 can be in contact with the welding section 21, and the inner wall of the shielding tube 30 is in contact with the first positioning sub-section 221, so that the first positioning sub-section 221 effectively positions the shielding tube 30.

[0050] In addition, in the embodiment of the present application, as shown in Figure 1 , Figure 2 , Figure 9 and Figure 10 , the wall thickness of the position where the shielding tube 30 is in contact with the first positioning sub-section 221 and the welding section 21 can be smaller than the wall thickness of the rest of the shielding tube 30, that is, the position where the shielding tube 30 is in contact with the first positioning sub-section 221 and the welding section 21 is a thin-walled section of the shielding tube 30, so that the welding stress between the welding section 21 and the shielding tube 30 is small when the welding section 21 and the shielding tube 30 are welded, and the ceramic tube 10 is prevented from being easily cracked at this position.

[0051] Additionally, in some embodiments, such as Figure 4 As shown, the second positioning segment 222 and the first positioning segment 221 have a second included angle β, which ranges from 40° to 50°. This setting ensures that the angle of the second positioning segment 222 corresponds to the chamfer of the ceramic tube 10, facilitating the positioning of the chamfer of the ceramic tube 10 by the second positioning segment 222, thereby ensuring the coaxiality of the ceramic tube 10 and the shielding tube 30.

[0052] It should be noted that the second included angle β can be any angle between 40° and 50°. For example, the second included angle β is 40°, 43°, 45°, 47°, or 50°. The specific angle of the second included angle β is not limited in the embodiments of this application.

[0053] In some embodiments, the cross-sections of the first positioning segment 221, the second positioning segment 222, and the extension segment 23 form an S-shaped cross-section. This arrangement simplifies the structure of the end cap structure 20, and the first positioning segment 221 and the second positioning segment 222 respectively position the shielding tube 30 and the ceramic tube 10, improving the coaxiality of the vacuum interrupter.

[0054] It should be noted that when the cross-sections of the first positioning segment 221, the second positioning segment 222, and the extension segment 23 form an S-shaped cross-section, a portion of the extension segment 23 can extend into the interior of the ceramic tube 10. Of course, the entire extension segment 23 can also be located inside the shielding tube 30. This embodiment of the present application does not limit this aspect.

[0055] Of course, in this embodiment, the cross-sections of the first positioning segment 221, the second positioning segment 222, and the extension segment 23 can also form cross-sections of different shapes. For example, the cross-sections of the first positioning segment 221, the second positioning segment 222, and the extension segment 23 can form a wavy cross-section, and the wavy cross-section includes at least two S-shaped cross-sections. The first positioning segment 221 and the second positioning segment 222 have a second included angle β, which means that the shape of the cross-section formed by the cross-sections of the first positioning segment 221 and the second positioning segment 222 is determined, and the cross-section of the extension segment 23 needs to be changed. This adjusts the shape of the cross-section formed by the cross-sections of the first positioning segment 221, the second positioning segment 222, and the extension segment 23. In other words, in this embodiment, the shape of the extension segment 23 can be adjusted according to actual conditions.

[0056] Additionally, in some embodiments, such as Figure 5 , Figure 6 andFigure 8 As shown in the figure, the positioning section 22 can include a third positioning sub-section 223, one end of the third positioning sub-section 223 is connected with the welding section 21, the other end of the third positioning sub-section 223 is connected with the extending section 23, the third positioning sub-section 223 extends along the axial direction of the shielding tube 30, and the third positioning sub-section 223 is in contact with the inner wall of the shielding tube 30; wherein the third positioning sub-section 223 and the welding section 21 have a first included angle a. Through such a setting, in the process of assembling the vacuum interrupter, the shielding tube 30 is sleeved on the third positioning sub-section 223, so that the third positioning sub-section 223 can position the shielding tube 30, and the coaxiality of the shielding tube 30 and the ceramic tube 10 is ensured, that is, the positioning section 22 only includes the third positioning sub-section 223, so that the structure of the positioning section 22 is relatively simple, and the structure of the end cover structure 20 is relatively simple, which is convenient for processing the end cover structure 20.

[0057] In addition, in some embodiments, as shown in the figures, Figure 5 , Figure 6 and Figure 8 the extending section 23 includes a first curved section 231 and a second curved section 232 connected with each other; the first curved section 231 is connected with the third positioning sub-section 223, and the notch of the first curved section 231 faces the ceramic tube 10, and the notch of the second curved section 232 faces the welding section 21. Through such a setting, the existence of the first curved section 231 and the second curved section 232 can improve the voltage sharing ability of the extending section 23, which is helpful for the voltage sharing of the end cover structure 20, and the structure of the extending section 23 is relatively simple only by arranging the first curved section 231 and the second curved section 232, which is convenient for processing the end cover structure 20. In addition, the first curved section 231 and the second curved section 232 can further improve the electric field distribution of the vacuum interrupter, and avoid the problem of possible external flashover of the vacuum interrupter.

[0058] In addition, in the embodiments of the present application, when the end cover structure 20 includes the third positioning sub-section 223, the first curved section 231 and the second curved section 232, at this time, the cross section of the third positioning sub-section 223, the cross section of the first curved section 231 and the cross section of the second curved section 232 form a spoon-shaped cross section, that is, the cross section of the end cover structure 20 is a spoon-shaped cross section.

[0059] In addition, in some embodiments, the welding section 21, the positioning section 22 and the extending section 23 are an integral molding structure. Through such a setting, the strength of the end cover structure 20 is relatively high, and the end cover structure 20 is convenient to process.

[0060] It should be noted that the end cover structure 20 can be formed by a stamping process, so that the welding section 21, the positioning section 22 and the extension section 23 are integrally formed. Of course, the end cover structure 20 can also be formed by other integral forming processes, for example, the end cover structure 20 is formed by using a 3D printing process, so that the welding section 21, the positioning section 22 and the extension section 23 are integrally formed.

[0061] In addition, when the positioning section 22 includes the first positioning sub-section 221 and the second positioning sub-section 222, at this time, the welding section 21, the first positioning sub-section 221, the second positioning sub-section 222 and the extension section 23 are integrally formed; when the positioning section 22 includes the third positioning sub-section 223, the welding section 21, the third positioning sub-section 223 and the extension section 23 are integrally formed.

[0062] In addition, in some embodiments, as shown in Figure 1 or Figure 5 The vacuum interrupter can further include a guide sleeve 60 and a sealing ring 70. The sealing ring 70 is connected to the end of the ceramic tube 10 away from the shielding tube 30, and the sealing ring 70 is provided with a mounting hole. Part of the guide sleeve 60 is connected to the mounting hole, and the movable contact rod 40 passes through the guide sleeve 60 and the mounting hole. By providing the guide sleeve 60, the guide sleeve 60 can guide the movable contact rod 40, facilitating the installation of the movable contact rod 40, and the sealing ring 70 can seal the end of the ceramic tube 10 away from the shielding tube 30.

[0063] It should be noted that in the embodiments of the present application, the guide sleeve 60 can be provided with buckles. When the guide sleeve 60 is connected in the mounting hole, the buckles on the guide sleeve 60 can be directly connected with the hole wall of the mounting hole, or the buckles on the guide sleeve 60 can be connected with the inner wall of the sealing ring 70, so that the guide sleeve 60 is fixed at the position of the mounting hole.

[0064] In addition, in some embodiments, as shown in Figure 1 or Figure 5 The vacuum interrupter further includes a bellows 80. The bellows 80 is sleeved on the movable contact rod 40, and the bellows 80 is located inside the ceramic tube 10. The first end of the bellows 80 abuts against the sealing ring 70. Through such a design, the bellows 80 cooperates with the movable contact rod 40, so that the wave screen cover and other components in the related art can be cancelled, and the structure of the vacuum interrupter can be simplified, so that the structure of the vacuum interrupter is simple.

[0065] In addition, in some embodiments, as shown in Figure 1 or Figure 5 The movable contact rod 40 is provided with a positioning structure 41. The second end of the bellows 80 cooperates with the positioning structure 41, and the positioning structure 41 positions the second end of the bellows 80.

[0066] By setting the positioning structure 41, when the bellows 80 is installed on the moving conductive rod 40, the second end of the bellows 80 can cooperate with the positioning structure 41, that is, the inner diameter of the second end of the bellows 80 cooperates with the positioning structure 41, so that the positioning structure 41 can position the bellows 80 and ensure that the bellows 80 can be correctly installed on the moving conductive rod 40.

[0067] It should be noted that the second end of the bellows 80 can be connected to the positioning structure 41 by vertical welding.

[0068] In addition, in some embodiments, the inner wall of the shielding tube 30 may be provided with protruding structures and / or recessed structures to increase the area of ​​the inner wall of the shielding tube 30, thereby helping the inner wall of the shielding tube 30 to adsorb the metal vapor generated between the moving contact 401 and the stationary contact 501.

[0069] It should be noted that the inner wall of the shielding tube 30 may only have protruding structures, or it may only have recessed structures. Of course, both protruding and recessed structures may be provided on the inner wall of the shielding tube 30. The protruding structure can be a boss, and the shape of the boss can be set according to actual needs. For example, the boss may extend along the circumferential direction of the shielding tube 30 to form a ring, or it may be a cuboid shape. The specific shape of the boss is not limited in this embodiment. Similarly, the recessed structure can be a groove, which may extend along the circumferential direction of the shielding tube 30. The groove may also be other shapes, such as a circular groove or a square groove. This is not limited in this embodiment either.

[0070] The installation process of the vacuum interrupter provided in the embodiments of this application will be described below:

[0071] like Figure 10 As shown, the shielding tube 30 is provided with a through hole 301. When installing the vacuum interrupter, the stationary conductive rod 50 can first pass through the through hole 301 of the shielding tube 30, and the end of the shielding tube 30 can contact the welding section 21 of the end cover structure 20. The thin wall of the shielding tube 30 can contact the first positioning sub-segment 221 of the positioning section 22, or the thin wall section of the shielding tube 30 can contact the third positioning sub-segment 223. Thus, the first positioning sub-segment 221 positions the shielding tube 30, or the third positioning sub-segment 223 positions the shielding tube 30. Then, the ceramic tube 10 is placed in the welding section 21 of the end cover structure 20, and the guide sleeve 60 is fixed in the mounting hole on the sealing ring 70 by a snap fastener. Finally, the moving conductive rod 40 passes through the guide sleeve 60, and the conductive rod passes through the through hole 24 on the end cover structure 20 and extends into the shielding tube 30. The moving contact 401 connected to the moving conductive rod 40 abuts against the stationary contact connected to the stationary conductive rod 50.

[0072] In the embodiment of the present application, the end cover structure 20 is provided to include the welding segment 21, the positioning segment 22 and the extension segment 23 connected in sequence, the welding segment 21 is connected with the ceramic tube 10 and the shielding tube 30 respectively, the positioning segment 22 and at least part of the extension segment 23 are located in the shielding tube 30, the extension segment 23 is provided with the through hole 24, the movable contact 40 passes through the through hole 24, so that not only the welding stress can be buffered by the welding segment 21 to avoid the problem that the ceramic tube 10 may be cracked due to the large stress at the welding position, but also the metal vapor generated between the movable contact 401 and the static contact 501 is blocked by the positioning segment 22 and the extension segment 23 of the end cover structure 20 to avoid the metal vapor being adsorbed on the inner wall of the ceramic tube 10, that is, the end cover structure 20 integrates the functions of the shielding cover and the baffle, that is, the end cover structure 20 has the pressure equalization function, and the electric field distribution of the vacuum arc-extinguishing chamber can be optimized, so that the shielding cover, the baffle and other components can be avoided, so that the internal space of the vacuum arc-extinguishing chamber can be sufficient, so as to enhance the withstand voltage performance of the vacuum arc-extinguishing chamber, and the parts of the vacuum arc-extinguishing chamber are reduced, which is helpful to improve the assembly efficiency of the vacuum arc-extinguishing chamber, and is helpful to reduce the cost of the vacuum arc-extinguishing chamber, and can also make the volume of the vacuum arc-extinguishing chamber smaller, and simplify the structure of the vacuum arc-extinguishing chamber.

[0073] The embodiment of the present application provides a disconnecting switch, which comprises the vacuum arc-extinguishing chamber in any one of the above-mentioned embodiments.

[0074] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above-mentioned terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0075] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A vacuum interrupter, characterized by, The vacuum interrupter comprises a ceramic tube, an end cover structure, a shielding tube, a moving conducting rod and a static conducting rod. The ceramic tube and the shielding tube are spaced apart along the axial direction of the shielding tube, the end cover structure is located between the ceramic tube and the shielding tube, the moving conducting rod penetrates through the ceramic tube and extends into the shielding tube, and at least part of the static conducting rod extends into the shielding tube. The end cover structure comprises a welding section, a positioning section and an extension section connected in sequence, the welding section and the positioning section have a first included angle, the positioning section extends along the axial direction of the shielding tube, the welding section is located between the ceramic tube and the shielding tube, and the welding section is connected with the ceramic tube and the shielding tube respectively, the positioning section and at least part of the extension section are located in the shielding tube, the extension section is provided with a through hole, and the moving conducting rod penetrates through the through hole.

2. The vacuum interrupter according to claim 1, characterized in that The positioning section comprises a first positioning sub-section and a second positioning sub-section connected in sequence, the first positioning sub-section is connected with the welding section, and the first positioning sub-section and the welding section have the first included angle, the first positioning sub-section extends along the axial direction of the shielding tube, and the first positioning sub-section is in contact with the inner wall of the shielding tube, and the second positioning sub-section is connected with the extension section.

3. The vacuum interrupter of claim 2, wherein, The second positioning sub-section and the first positioning sub-section have a second included angle, and the second included angle ranges from 40° to 50°.

4. The vacuum interrupter of claim 2, wherein, The cross section of the first positioning sub-section, the cross section of the second positioning sub-section and the cross section of the extension section form an S-shaped cross section.

5. The vacuum interrupter of claim 1, wherein, The positioning section comprises a third positioning sub-section, one end of the third positioning sub-section is connected with the welding section, the other end of the third positioning sub-section is connected with the extension section, the third positioning sub-section extends along the axial direction of the shielding tube, and the third positioning sub-section is in contact with the inner wall of the shielding tube. The third positioning sub-section and the welding section have the first included angle.

6. The vacuum interrupter of claim 5, wherein, The extension section comprises a first bending section and a second bending section connected in sequence. The first bending section is connected with the third positioning sub-section, the notch of the first bending section faces the ceramic tube, and the notch of the second bending section faces the welding section.

7. The vacuum interrupter according to any of claims 1 to 6, characterized in that The welding section, the positioning section and the extension section are integrally formed.

8. The vacuum interrupter according to any of claims 1-6, characterized in that The vacuum interrupter further comprises a guide sleeve and a sealing ring. The sealing ring is connected to one end of the ceramic tube away from the shielding tube, the sealing ring is provided with a mounting hole, part of the guide sleeve is connected to the mounting hole, and the moving conducting rod penetrates through the guide sleeve and the mounting hole.

9. The vacuum interrupter of claim 8, wherein, The vacuum interrupter further comprises a bellows, the bellows is sleeved on the moving conducting rod, the bellows is located in the interior of the ceramic tube, and a first end of the bellows abuts against the sealing ring.

10. The vacuum interrupter of claim 9, wherein, The moving conducting rod is provided with a positioning structure, a second end of the bellows is matched with the positioning structure, and the positioning structure positions the second end of the bellows.

11. A disconnector, characterized in that The disconnector comprises the vacuum interrupter according to any one of claims 1-10.

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