Arc extinguish chamber contact and vacuum arc extinguish chamber

Abstract

The utility model provides an arc extinguish chamber contact and a vacuum arc extinguish chamber, and belongs to the field of electric switches. The arc extinguish chamber contact comprises a contact body, the contact body comprises a side enclosure wall and an end wall located at one axial end of the side enclosure wall, at least the side enclosure wall of the contact body is provided with a slotting structure, the arc extinguish chamber contact further comprises a contact shielding cover arranged outside the contact body in a sleeving mode, and the contact shielding cover comprises a side shielding part and an end shielding part which are axially arranged. The side shielding part corresponds to the side enclosure bulkhead and is used for shielding the side enclosure bulkhead, the end shielding part corresponds to the end wall and is used for shielding the end wall, the two axial ends of the contact shielding cover are connecting parts used for being fixedly connected with the contact body, and a gap is reserved between the part, located between the two connecting parts, of the contact shielding cover and the contact body. The vacuum arc extinguish chamber comprises the arc extinguish chamber contact. According to the utility model, electric field concentration on the contact body is avoided by using the contact shielding cover, so that the contact body is protected from being ablated and broken down.

Description

Technical Field

[0001] This utility model belongs to the field of electrical switches, and in particular relates to an arc-extinguishing chamber contact and a vacuum arc-extinguishing chamber. Background Technology

[0002] Vacuum switches are widely used in power, metallurgy, chemical and other fields, accounting for 70%-80% of medium and low voltage switches. When a vacuum interrupter interrupts current, it generates a large number of vacuum arcs. The longitudinal and transverse magnetic fields generated by the contacts are usually used to control the vacuum arcs to enhance the breaking capacity and prevent contact erosion.

[0003] Chinese invention patent application CN116779371A discloses a vacuum interrupter contact structure. This structure includes a contact cup body with multiple slotted structures circumferentially distributed along its centerline. Each slotted structure includes a turning slot, a through slot, and a straight slot. The turning slot is located on the side wall of the contact cup body, the straight slot is located on the end wall, and the through slot is located between the turning and straight slots, with one end connected to the turning slot and the other end connected to the straight slot. The slotted structure divides the side and end walls of the contact cup body into multiple specific paths for guiding current flow. The current flowing along these paths generates longitudinal and transverse magnetic fields.

[0004] In the aforementioned arc-extinguishing chamber contact structure, the slotted structure on the contact body is generally formed by machining, which can easily produce sharp edges and a lot of burrs. This can lead to electric field concentration on the side walls and end walls of the contact body, thereby increasing the risk of breakdown and easily causing the arc to be drawn to the side walls or end walls and burn the contact body. Utility Model Content

[0005] One of the objectives of this utility model is to provide an arc-extinguishing chamber contact that solves the technical problem in the prior art where the arc-extinguishing chamber contact is prone to being punctured at the side wall and end wall due to sharp edges and burrs after the slotted structure is set. This also addresses the high risk of ablation.

[0006] Another objective of this invention is to provide a vacuum interrupter to solve the aforementioned technical problems.

[0007] To achieve the above objectives, the technical solution for the arc-extinguishing chamber contact provided by this utility model is as follows:

[0008] An arc-extinguishing chamber contact includes a contact body, which includes a side wall and an end wall located at one axial end of the side wall. At least one side wall of the contact body has a slotted structure. The arc-extinguishing chamber contact also includes a contact shield sleeved on the contact body. The contact shield includes an axially arranged side shield and an end shield. The side shield corresponds to the side wall and is used to shield the side wall. The end shield corresponds to the end wall and is used to shield the end wall. Both axial ends of the contact shield are connecting parts for fixed connection with the contact body. The portion of the contact shield located between the two connecting parts has a gap with the contact body.

[0009] As a further improvement, the end wall includes an end body portion that is an end protrusion located on the side of the end body portion away from the side wall, and a connection portion between the contact shield and the end wall that is an end connection portion, with the inner circumferential surface of the end connection portion being fixedly connected to the outer circumferential surface of the end protrusion portion.

[0010] As a further improvement, the side walls and end walls of the contact body are provided with slotted structures, and the slotted structures on the end walls are located on the end body.

[0011] As a further improvement, the angle between the end connection and the section shield is an obtuse angle.

[0012] As a further improvement, the side wall includes a side main body and a side protrusion on the outer periphery of the side main body away from the end wall. The side protrusion is annular, and the connection between the contact shield and the side wall is a side connection part. The axial end face of the side connection part is in contact with the axial end face of the side protrusion.

[0013] As a further improvement, the axial end face of the side connection is fixedly connected to the corresponding axial end face of the side protrusion.

[0014] As a further improvement, an observation window is provided on the end shield of the contact shield.

[0015] As a further improvement, the arc-extinguishing chamber contact also includes a magnetic ring and a contact plate. The contact plate is located at the end of the side wall away from the end wall, and the magnetic ring is located inside the side wall. The two axial ends of the magnetic ring are in contact with the end wall and the contact plate, respectively. A partition groove penetrating the inner and outer sides of the magnetic ring is opened at one axial end of the magnetic ring. The partition groove is arranged along the circumferential direction of the magnetic ring.

[0016] As a further improvement, the two ends of the magnetic ring are a large end and a small end, respectively. The inner diameter of the large end of the magnetic ring is larger than the inner diameter of the small end, and the outer diameter of the large end of the magnetic ring is larger than the outer diameter of the small end. Both the inner and outer sides of the magnetic ring have a structure that gradually expands outward from the small end to the large end.

[0017] The beneficial effects are as follows: The arc-extinguishing chamber contact provided by this utility model is an improvement on the prior art. The arc-extinguishing chamber contact is provided with a contact shield, which can shield the contact body and avoid the problem of electric field concentration caused by the slotted structure on the side wall and end wall of the contact body, thereby reducing the risk of breakdown and the risk of the arc being drawn to the side wall or end wall and burning the contact body.

[0018] To achieve the above objectives, the technical solution for the vacuum interrupter provided by this utility model is as follows:

[0019] A vacuum interrupter includes a shell and an interrupter contact located inside the shell. The interrupter contact includes a contact body, which includes a side wall and an end wall located at one axial end of the side wall. At least one side wall of the contact body has a slotted structure. The interrupter contact also includes a contact shield sleeved on the contact body. The contact shield includes an axially arranged side shield and an end shield. The side shield corresponds to the side wall and is used to shield the side wall. The end shield corresponds to the end wall and is used to shield the end wall. Both axial ends of the contact shield are connecting parts for fixed connection with the contact body. The portion of the contact shield located between the two connecting parts has a gap with the contact body.

[0020] As a further improvement, the end wall includes an end body portion that is an end protrusion located on the side of the end body portion away from the side wall, and a connection portion between the contact shield and the end wall that is an end connection portion, with the inner circumferential surface of the end connection portion being fixedly connected to the outer circumferential surface of the end protrusion portion.

[0021] As a further improvement, the side walls and end walls of the contact body are provided with slotted structures, and the slotted structures on the end walls are located on the end body.

[0022] As a further improvement, the angle between the end connection and the section shield is an obtuse angle.

[0023] As a further improvement, the side wall includes a side main body and a side protrusion on the outer periphery of the side main body away from the end wall. The side protrusion is annular, and the connection between the contact shield and the side wall is a side connection part. The axial end face of the side connection part is in contact with the axial end face of the side protrusion.

[0024] As a further improvement, the axial end face of the side connection is fixedly connected to the corresponding axial end face of the side protrusion.

[0025] As a further improvement, an observation window is provided on the end shield of the contact shield.

[0026] As a further improvement, the arc-extinguishing chamber contact also includes a magnetic ring and a contact plate. The contact plate is located at the end of the side wall away from the end wall, and the magnetic ring is located inside the side wall. The two axial ends of the magnetic ring are in contact with the end wall and the contact plate, respectively. A partition groove penetrating the inner and outer sides of the magnetic ring is opened at one axial end of the magnetic ring. The partition groove is arranged along the circumferential direction of the magnetic ring.

[0027] As a further improvement, the two ends of the magnetic ring are a large end and a small end, respectively. The inner diameter of the large end of the magnetic ring is larger than the inner diameter of the small end, and the outer diameter of the large end of the magnetic ring is larger than the outer diameter of the small end. Both the inner and outer sides of the magnetic ring have a structure that gradually expands outward from the small end to the large end.

[0028] The beneficial effects are as follows: The vacuum interrupter provided by this utility model is an improvement on the existing technology. The interrupter contacts in this vacuum interrupter are equipped with contact shields, which can shield the contact body, avoiding the problem of electric field concentration caused by the slotted structure on the side and end walls of the contact body, reducing the risk of breakdown, and also reducing the risk of the arc being drawn to the side or end walls and burning the contact body. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the vacuum interrupter in Embodiment 1 of this utility model;

[0030] Figure 2 This is a schematic diagram of the structure of the arc-extinguishing chamber contact in Embodiment 1 of the vacuum arc-extinguishing chamber of this utility model;

[0031] Figure 3 This is a side view of the contact body in Embodiment 1 of the vacuum interrupter of this utility model;

[0032] Figure 4 This is a top view of the contact body in Embodiment 1 of the vacuum interrupter of this utility model.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Outer shell; 2. Static conductive rod; 3. Moving conductive rod; 4. Arc-extinguishing chamber contact; 41. Contact body; 411. Side main body; 412. Side protrusion; 413. End main body; 414. End protrusion; 415. Spiral groove section; 416. Straight groove section; 417. Limiting protrusion ring; 42. Contact shield; 421. Side connection part; 422. Side shield; 423. End shield; 424. End connection part; 425. Observation window; 43. Magnetizing ring; 431. Separating groove; 44. Support ring; 45. Contact piece; 5. Main shield; 6. End shield. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the embodiments.

[0036] To address the problems in the prior art, the basic concept of this utility model is to use a contact shield to prevent the electric field from concentrating on the contact body, thereby protecting the contact body from being burned and broken down.

[0037] Specific embodiment 1 of the vacuum interrupter provided by this utility model:

[0038] See appendix Figure 1 The vacuum interrupter includes an outer shell 1 and conductive rods and interrupter contacts 4 disposed inside the outer shell 1. The conductive rods include a moving conductive rod 3 and a stationary conductive rod 2. Both the moving conductive rod 3 and the stationary conductive rod 2 are provided with interrupter contacts 4 at one end inside the outer shell 1. The outer shell 1 is also provided with a main shield 5 located in the middle of the outer shell 1 and an end shield 6 located at the end of the outer shell 1.

[0039] See appendix Figure 2 The arc-extinguishing chamber contact 4 includes a contact body 41, a contact shield 42, a magnetic ring 43, a support ring 44, and a contact plate 45.

[0040] See appendix Figure 2 and in conjunction with the appendix Figure 3 and attached Figure 4 The contact body 41 includes a side wall and an end wall located at one axial end of the side wall. The contact body 41 is generally cup-shaped. The side wall includes a side main body 411 and a side protrusion 412. The side protrusion 412 is annular and located on the outer periphery of the side main body 411 away from the end wall. The end wall includes an end main body 413 and an end protrusion 414. The end protrusion 414 is columnar and located at the center of the end of the end main body 413 away from the side wall. An annular groove for cooperating with a conductive rod is provided on the outer side of the axial end of the end protrusion 414.

[0041] The contact body 41 is provided with a slotted structure, which includes a spiral slot section 415 and a straight slot section 416. The spiral slot section 415 is located on the side wall, and the straight slot section 416 is located on the end body portion 413 of the end wall. Each spiral slot section 415 corresponds to and is connected to each straight slot section 416. The straight slot section 416 extends radially along the end wall, and the spiral slot section 415 extends spirally along the side wall. The portion of the contact body 41 between the slotted structures becomes the current flow path. The current on the side wall mainly generates a longitudinal magnetic field, while the current on the end wall mainly generates a transverse magnetic field. The longitudinal magnetic field keeps the vacuum arc in a diffused state, preventing the vacuum arc from accumulating. The transverse magnetic field causes the vacuum arc to rotate at high speed on the surface of the arc-extinguishing chamber contact 4, reducing the ablation degree of the arc-extinguishing chamber contact 4.

[0042] The contact piece 45 is located at the end of the side wall away from the end wall, thereby closing the open end of the contact body 41. In use, the contact piece 45 is used to press against the contact piece 45 on another arc-extinguishing chamber contact 4 so that the vacuum arc-extinguishing chamber is closed and turned on.

[0043] See appendix Figure 2 The magnetic ring 43 has a large end and a small end at its two axial ends, respectively. The inner diameter of the large end of the magnetic ring 43 is larger than that of the small end, and the outer diameter of the large end is larger than that of the small end. Both the inner and outer surfaces of the magnetic ring 43 gradually expand outward from the small end to the large end. The magnetic ring 43 is located on the inner side of the side wall, with the small end in contact with the end wall and the large end in contact with the contact piece 45. A dividing groove 431 is provided at the large end of the magnetic ring 43, penetrating both the inner and outer sides of the magnetic ring 43. The dividing groove 431 is arranged along the circumference of the magnetic ring 43. The magnetic ring 43 is made of electrical pure iron, which can be magnetized to generate a magnetic field when energized, thereby enhancing the magnetic field strength between the two arc-extinguishing chamber contacts 4. The depth of the dividing groove 431 is axial, which can prevent eddy currents and hysteresis from occurring in the magnetic ring 43.

[0044] See appendix Figure 2 The support ring 44 is located inside the magnetic ring 43, and its two axial ends contact the end wall and the contact piece 45, respectively. During closing, the contact pieces 45 of the two arc-extinguishing chamber contacts 4 abut against each other, and the contact pieces 45, especially the center position, will bear a large pressure. After setting the support ring 44, the support ring 44 can provide reliable support for the contact pieces 45, thereby preventing the contact pieces 45 from being deformed by pressure.

[0045] A limiting protrusion ring 417 is provided on the end wall of the contact body 41. The limiting protrusion ring 417 is located inside the contact body 41. The corresponding end of the support ring 44 is located inside the limiting protrusion ring 417, and the corresponding end of the magnetic focusing ring 43 is located outside the limiting protrusion ring 417. The limiting protrusion ring 417 can position the support ring 44 and the magnetic focusing ring 43 when they are assembled.

[0046] See appendix Figure 2 The contact shield 42 is sleeved on the outside of the contact body 41. Both axial ends of the contact shield 42 are connecting parts for fixed connection with the contact body 41. One of the connecting parts is a side connecting part 421 for connection with the side wall, and the other connecting part is an end connecting part 424 for connection with the end wall. The contact shield 42 also includes a side shield 422 and an end shield 423 located between the side connecting part 421 and the end connecting part 424 and arranged axially. The side shield 422 is adjacent to the side connecting part 421, and the end shield 423 is adjacent to the end connecting part 424.

[0047] The side shielding portion 422 is located radially outside the side main body portion 411 of the side enclosure, and a gap is left between the side shielding portion 422 and the side main body portion 411. The axial end face of the side connecting portion 421 is abutted and fixedly connected to the axial end face of the side protrusion portion 412, and the outer peripheral surface of the side protrusion portion 412 is aligned with the outer peripheral surface of the side connecting portion 421. The side protrusion portion 412 can shield the side connecting portion 421, preventing the side connecting portion 421 from protruding from the surface of the arc-extinguishing chamber body, thereby ensuring a better shielding effect.

[0048] The end shield 423 is located on the side of the end body 413 of the end wall that is axially away from the side wall, and a gap is left between the end shield 423 and the end body 413. The inner peripheral surface of the end connecting part 424 is fitted and fixedly connected to the outer peripheral surface of the end protrusion 414. An observation window 425 is provided on the end shield 423 to facilitate the operator to observe the internal state during assembly. The fixed connection between the end connecting part 424 and the end protrusion 414 ensures that the end shield 423 can fully cover the slotted structure on the end body 413.

[0049] Both the side shielding portion 422 and the side connecting portion 421 are cylindrical structures, as is the end connecting portion 424. However, the end shielding portion 423 is a conical structure, and the angle between the end shielding portion 423 and the end connecting portion 424 is an obtuse angle. This allows for a smoother transition between the end shielding portion 423 and the end connecting portion 424, as well as the side shielding portion 422, which is beneficial for improving the shielding effect.

[0050] In this embodiment, the fixed connection between the various components is achieved by brazing. The brazing method involves placing the brazing filler metal between the two components that need to be fixedly connected, and then heating the whole assembly to achieve brazing. This method is existing technology in the field and will not be described in detail here.

[0051] The contact 4 in the vacuum interrupter is equipped with a contact shield 42, which can shield the contact body 41, avoid the problem of electric field concentration caused by the slotted structure on the side wall and end wall of the contact body 41, reduce the risk of breakdown, and also reduce the risk of the arc being drawn to the side wall or end wall and burning the contact body 41.

[0052] Specific embodiment 2 of the vacuum interrupter provided by this utility model:

[0053] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the end wall in this embodiment only includes the end body and does not have an end protrusion. The center of the end body is provided with a groove for connecting with the conductive rod. In this embodiment, the axial inner side of the end connection part is attached to and fixedly connected with the axial outer side of the end body part.

[0054] Specific embodiment 3 of the vacuum interrupter provided by this utility model:

[0055] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the slotted structure is only provided on the side wall, while there is no slotted structure on the end wall.

[0056] Specific embodiment 4 of the vacuum interrupter provided by this utility model:

[0057] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the end shielding part is a circular flat plate structure, the angle between the end shielding part and the end connecting part is a right angle, the angle between the end shielding part and the side shielding part is also a right angle, and the transition between the end shielding part and the end connecting part, and between the end shielding part and the side shielding part is a rounded transition.

[0058] Specific embodiment 5 of the vacuum interrupter provided by this utility model:

[0059] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, the side connecting part and the inner peripheral surface are fixedly connected to the outer peripheral surface of the side main body. The axial end face of the side protrusion only contacts the axial end face of the side connecting part but is not fixedly connected, which can also achieve the blocking of the side connecting part by the side protrusion.

[0060] Specific embodiment 6 of the vacuum interrupter provided by this utility model:

[0061] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that no side protrusion is provided, and the axial end face of the side connection part is directly aligned with the axial end face of the side wall.

[0062] Specific embodiment 7 of the vacuum interrupter provided by this utility model:

[0063] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the magnetic ring in this embodiment has a constant diameter structure.

[0064] Specific embodiment 8 of the vacuum interrupter provided by this utility model:

[0065] This embodiment is based on Embodiment 1, but the difference is that no magnetic ring is provided in this embodiment.

[0066] Specific embodiments of the arc-extinguishing chamber contact provided by this utility model:

[0067] The arc-extinguishing chamber contact is the arc-extinguishing chamber contact in any of the specific embodiments 1-8 of the above-mentioned vacuum arc-extinguishing chamber, and will not be described in detail here.

[0068] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An arc-extinguishing chamber contact, comprising a contact body, the contact body including a side wall and an end wall located at one axial end of the side wall, wherein at least the side wall of the contact body is provided with a slotted structure, characterized in that, The arc-extinguishing chamber contact also includes a contact shield sleeved on the contact body. The contact shield includes a side shield and an end shield arranged axially. The side shield corresponds to the side wall and is used to shield the side wall. The end shield corresponds to the end wall and is used to shield the end wall. Both axial ends of the contact shield are connecting parts for fixed connection with the contact body. The part of the contact shield located between the two connecting parts leaves a gap with the contact body.

2. The arc-extinguishing chamber contact according to claim 1, characterized in that, The end wall includes an end body portion, which is an end protrusion located on the side of the end body portion away from the side wall. The contact shield and the corresponding connection portion of the end wall is an end connection portion. The inner circumferential surface of the end connection portion is fixedly connected to the outer circumferential surface of the end protrusion portion.

3. The arc-extinguishing chamber contact according to claim 2, characterized in that, The contact body has slotted structures on both the side walls and end walls, and the slotted structures on the end walls are located on the end body.

4. The arc-extinguishing chamber contact according to claim 2 or 3, characterized in that, The angle between the end connection and the section shield is an obtuse angle.

5. The arc-extinguishing chamber contact according to any one of claims 1-3, characterized in that, The side wall includes a side main body and a side protrusion on the outer periphery of the side main body away from the end wall. The side protrusion is annular. The connection between the contact shield and the side wall is a side connection part. The axial end face of the side connection part is in contact with the axial end face of the side protrusion.

6. The arc-extinguishing chamber contact according to claim 5, characterized in that, The axial end face of the side connection part is fixedly connected to the corresponding axial end face of the side protrusion part.

7. The arc-extinguishing chamber contact according to any one of claims 1-3, characterized in that, An observation window is provided on the end shield of the contact shield.

8. The arc-extinguishing chamber contact according to any one of claims 1-3, characterized in that, The arc-extinguishing chamber contact also includes a magnetic ring and a contact plate. The contact plate is located at the end of the side wall away from the end wall. The magnetic ring is located inside the side wall. The two axial ends of the magnetic ring are in contact with the end wall and the contact plate, respectively. A partition groove penetrating the inner and outer sides of the magnetic ring is opened at one axial end of the magnetic ring. The partition groove is arranged along the circumferential direction of the magnetic ring.

9. The arc-extinguishing chamber contact according to claim 8, characterized in that, The magnetic ring has a large end and a small end at its two axial ends. The inner diameter of the large end is larger than that of the small end, and the outer diameter of the large end is larger than that of the small end. Both the inner and outer surfaces of the magnetic ring have a structure that gradually expands outward from the small end to the large end.

10. A vacuum interrupter, comprising a housing and interrupter contacts located within the housing, characterized in that, The arc-extinguishing chamber contact is the arc-extinguishing chamber contact as described in any one of claims 1-9.

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