Contact structure and vacuum arc-extinguishing chamber

Abstract

The utility model discloses a contact structure and a vacuum arc extinguish chamber of a circuit breaker, the contact structure comprises a sheet-shaped contact, the contact is provided with an arc groove penetrating through two surfaces of the contact in the thickness direction, one end of the arc groove is located in the middle area of the contact, and the other end of the arc groove penetrates through the peripheral surface of the contact; the arc groove comprises a spiral groove and a straight edge groove which extend in an Archimedes spiral line mode, and the spiral groove and the straight edge groove are sequentially distributed in the direction from one end of the arc groove to the other end of the arc groove. The arc groove comprises the spiral groove and the straight edge groove, and the length of the tip of each section of the contact can be reduced by using the straight edge groove, so that the effective utilization area of arc running on the surface of the contact can be increased, and the section opening capability and the electric service life capability of the contact are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to vacuum arc extinguishing technical field especially is related to a contact structure and vacuum arc extinguishing chamber. BACKGROUND

[0002] Vacuum arc extinguishing chamber transverse magnetic breaking technology has been widely used in various circuit breakers, and the product with the contact structure has the characteristics of small volume, large rated current and large short-circuit breaking current. At present, the moving and static contacts of the vacuum arc extinguishing chamber are generally provided with a plurality of arc grooves. The arc grooves are generally spiral grooves extending in the form of Archimedes spiral. One end of the arc groove is located in the middle region of the contact, and the other end of the arc groove penetrates the outer peripheral surface of the contact. Therefore, the region of the contact provided with the arc groove is divided into a plurality of petal structures by the arc groove. During the breaking process of the contact, the electric arc is rapidly blown away from the surface of the contact by the tangential force of the transverse magnetic field after the arc is generated. At the tip position of each petal of the contact, the electric arc has run out or transitioned under the action of the tangential force of the magnetic field, so the tip position is basically not ablated. However, the spiral groove design of the arc groove makes the length of the tip of each petal of the contact longer, reducing the effective utilization area of the arc running on the surface of the contact. SUMMARY

[0003] The utility model provides a kind of contact structure and vacuum arc extinguishing chamber to the technical problems existing in prior art, and its effective utilization area of arc running on the surface of contact is increased by structure improvement.

[0004] The technical scheme adopted by the utility model to solve its technical problems is: a contact structure, including the contact of sheet shape, the contact is provided with the arc groove penetrating the thickness direction of two surfaces, one end of the arc groove is located in the middle region of the contact, the other end of the arc groove penetrates the outer peripheral surface of the contact;The arc groove includes spiral groove and straight edge groove extending in the form of Archimedes spiral, and spiral groove and straight edge groove are sequentially distributed along the direction of one end of the arc groove to the other end.

[0005] Further, at least one surface of the contact in the thickness direction includes a contact surface and a non-contact surface located at the periphery of the contact surface, the thickness of the part of the contact provided with the non-contact surface gradually decreases in the direction of the contact radially outward, and / or the thickness of the part of the contact provided with the non-contact surface is less than the thickness of the part of the contact provided with the contact surface, so that the contact surface protrudes from the non-contact surface.

[0006] Further, the non-contact surface is located at the edge position of the contact, and the non-contact surface is an inclined surface or an arc surface.

[0007] Further, the two surfaces of the contact in the thickness direction respectively include the contact surface and the non-contact surface.

[0008] Further, the spiral groove is located in the range of the contact surface, or a part of the spiral groove is located in the range of the contact surface and the remaining part is located in the range of the non-contact surface.

[0009] Further, the arc grooves are arranged in multiple, and the multiple arc grooves are distributed at intervals around the axis of the contact head; the center of the contact head is provided with a connecting hole.

[0010] The utility model further provides a vacuum arc-extinguishing chamber, including contact head group, this contact head group includes mutually cooperated movable contact head and static contact head, movable contact head, static contact head adopts the contact head structure at above-mentioned utility model respectively.

[0011] Further, it further includes ceramic tube, first sealing ring, second sealing ring, the ceramic tube is arranged between the first sealing ring and the second sealing ring, the contact head group is located in the first sealing ring, the static contact head is connected with static conducting rod, and the static conducting rod is arranged in the first sealing ring, the movable contact head is connected with dynamic conducting rod, and the dynamic conducting rod is arranged in the second sealing ring, it further includes shield cover, and the shield cover is connected to the first sealing ring and / or ceramic tube, and the ceramic tube and contact head group are isolated, the shield cover is provided with the accommodation hole corresponding the dynamic conducting rod.

[0012] Further, it further includes shielding plate, the shielding plate is sleeved on the dynamic conducting rod and is located between the movable contact head and the shield cover, and the outer diameter of the shielding plate is greater than the inner diameter of the accommodation hole.

[0013] Further, the movable contact head and the static contact head are CuCr alloy contact heads, and the outer diameter of the ceramic tube is less than or equal to 110 mm.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. Since the arc groove of the utility model includes the spiral groove extending in the form of Archimedes spiral and the straight edge groove, the spiral groove and the straight edge groove are sequentially distributed along one end of the arc groove to the other end, so that the utility model can reduce the length of the tip of each petal of the contact head by using the straight edge groove, thereby increasing the effective utilization area of the arc running on the surface of the contact head and improving the breaking capacity and electrical life capacity of the contact head.

[0016] 2. Since at least one surface of the contact in its thickness direction includes a contact surface and a non-contact surface located around the contact surface, the non-contact surface mainly undertakes the function of arc running and less of the function of arc initiation. This can reduce the degree of ablation on the outer surface of the contact in the initial stage of breaking, thereby further improving the electrical life of the product. When the two surfaces of the contact in its thickness direction respectively include the contact surface and the non-contact surface, the contact can be used as both a moving contact and a stationary contact. This allows the moving and stationary contacts to be implemented using the same type of contact, making installation less prone to errors and suitable for mass production, thus reducing production costs.

[0017] 3. The shielding plate and shielding cover are arranged in a partially staggered manner, which can completely block the electric arc and metal vapor, prevent the inner wall of the ceramic tube from being contaminated, and ensure the insulation performance of the product after breakage.

[0018] 4. The moving and stationary contacts are made of CuCr alloy, which reduces the circuit resistance of the product while ensuring breaking capacity. Furthermore, its strong breaking contact structure allows the product diameter to be less than or equal to 110mm, thus enabling product miniaturization and reducing space occupation. Because this invention places the moving and stationary contacts entirely within the lower sealing ring, the overall structure is compact. The elimination of the shielding cylinder and the addition of a shielding plate structure enhances the shielding effect, further saving space in the overall product structure. Increasing the contact diameter without increasing the overall product diameter, combined with other structural features, can enhance product performance.

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the contact structure and vacuum interrupter of the present invention are not limited to the embodiments. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the first contact structure of this utility model;

[0021] Figure 2 This is a top view of the first contact structure of this utility model;

[0022] Figure 3 yes Figure 2 AA section view;

[0023] Figure 4 This is a top view of the second contact structure of this utility model;

[0024] Figure 5 This is a top view of the third contact structure of this utility model;

[0025] Figure 6 This is a top view of the fourth contact structure of this utility model;

[0026] Figure 7 This is a top view of the fifth contact structure of this utility model;

[0027] Figure 8 This is a cross-sectional view of the vacuum interrupter of this utility model;

[0028] In the diagram, 1 is the contact; 11 is the connecting hole; 12 is the arc groove; 121 is the spiral groove; 122 is the straight edge groove; 13 is the contact surface; 14 is the non-contact surface; 2 is the moving contact; 3 is the stationary contact; 4 is the moving conductive rod; 5 is the stationary conductive rod; 6 is the first sealing ring; 7 is the second sealing ring; 8 is the ceramic tube; 9 is the shielding cover; 91 is the clearance hole; and 10 is the shielding plate. Detailed Implementation

[0029] In this utility model, the terms "first," "second," etc., are used only to distinguish similar objects. Furthermore, in the description of this utility model, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0030] Please see Figures 1-7 As shown, a contact structure of this utility model includes a sheet-shaped contact 1. The contact 1 has a connecting hole 11 at its center for connecting a conductive rod. The contact 1 has multiple arc grooves 12 extending through two surfaces in its thickness direction, spaced apart around the axis of the contact 1. One end of each arc groove 12 is located in the middle region of the contact 1, and the other end extends through the outer circumference of the contact 1. The arc groove 12 includes a spiral groove 121 extending in the shape of an Archimedean spiral and a straight-edge groove 122. The spiral groove 121 and the straight-edge groove 122 are sequentially distributed from one end of the arc groove 12 to the other end. The length of the spiral groove 121 is greater than or equal to the length of the straight-edge groove 122. The width of the spiral groove 121 is 1-4 mm. The straight-edge groove 122 smoothly transitions to the tangent of the outer circumference of the contact 1 at the straight-edge groove 122 at a 10° angle. This angle is only for guiding processing and can be any angle.

[0031] The contact 1 has at least one surface in its thickness direction comprising a contact surface 13 and a non-contact surface 14 located around the contact surface 13. The thickness of the portion of the contact 1 with the non-contact surface 14 is less than the thickness of the portion of the contact 1 with the contact surface 13, so that the contact surface 13 protrudes beyond the non-contact surface 14. The contact surface 13 is the surface that can perform contact function when the moving and stationary contacts are closed, while the non-contact surface 14 does not perform contact function. In this embodiment, the contact surface 13 is a plane perpendicular to the thickness direction of the contact 1, but it is not limited to this. In other embodiments, the contact surface 13 is an arc surface or an irregular surface, etc. The non-contact surface 14 is located at the edge of the contact 1, and the thickness of the portion of the contact 1 with the non-contact surface 14 gradually decreases in the radial outward direction of the contact 1. In this embodiment, the two surfaces of the contact in its thickness direction respectively include the contact surface 13 and the non-contact surface 14. The spiral groove 121 is located within the contact surface 13, and both sides of the end where the spiral groove 121 connects to the straight edge groove 122 are located within the contact surface 13. However, this is not a limitation. In other embodiments, the spiral groove 121 is located within the contact surface 13, and the outer side of the end where the spiral groove 121 connects to the straight edge groove 122 intersects with the edge line of the contact surface 13, such as... Figure 4 As shown; in other embodiments, a portion of the spiral groove 121 is located within the contact surface 13, while the remainder is located outside the contact surface 13. Specifically, the inner side of the end of the spiral groove 121 that connects to the straight edge groove 122 intersects the edge line of the contact surface 13, and the outer side of the end of the spiral groove 121 that connects to the straight edge groove 122 is located within the non-contact surface 14, as shown. Figure 5 As shown, or, the inner side of the end where the spiral groove 121 connects to the straight edge groove 122 is located within the contact surface 13, and the outer side of the end where the spiral groove 121 connects to the straight edge groove 122 is located within the non-contact surface 14, as shown. Figure 6 As shown; or, the inner and outer sides of the end where the spiral groove 121 connects to the straight edge groove 122 are both located within the range of the non-contact surface 14, such as... Figure 7 As shown.

[0032] In this embodiment, the non-contact surface 14 is a slope, but it is not limited to this. The slope can also be replaced by an arc surface, which is an equivalent substitution.

[0033] Since the arc groove 12 of this utility model includes a spiral groove 121 and a straight edge groove 122, this utility model can use the straight edge groove 122 to reduce the tip length of each segment of the contact 1, thereby increasing the effective utilization area of ​​the electric arc running on the contact surface, and thus improving the breaking capacity and electrical life of the contact 1.

[0034] This invention provides inclined surfaces (i.e., non-contact surfaces 14) on the outer periphery of the two surfaces of the contact 1, allowing the moving and stationary contacts to be implemented using the same contact structure. That is, the contact 1 of this invention can function as both a moving and a stationary contact, eliminating the need for separate machining of the moving and stationary contacts and reducing the likelihood of installation errors. Furthermore, the non-contact surface 14 (i.e., the inclined surface) primarily serves to prevent arcing, with only a minor role in arc initiation, reducing the degree of ablation on the outer surface of the contact 1 during the initial breaking phase, thereby further improving the product's electrical life.

[0035] Please see Figures 1-4 As shown, the present invention provides a vacuum interrupter, specifically a vacuum interrupter for a circuit breaker, which includes a contact group comprising a moving contact 2 and a stationary contact 3 that cooperate with each other. The moving contact 2 and the stationary contact 3 respectively adopt the contact structure of the present invention described above.

[0036] This invention also includes a ceramic tube 8, a first sealing ring 6, and a second sealing ring 7, with the ceramic tube 8 positioned between the first sealing ring 6 and the second sealing ring 7. The contact assembly is located within the first sealing ring 6. A stationary conductive rod 5 is connected to the connection hole of the stationary contact 3, passing through the first sealing ring 6. A movable conductive rod 4 is connected to the connection hole of the moving contact 2, passing through the second sealing ring 7. This invention also includes a shielding cover 9, which is connected to the first sealing ring 6 and / or the ceramic tube 8, and isolates the ceramic tube 8 and the contact assembly. The shielding cover 9 has a clearance hole 91 corresponding to the movable conductive rod 4.

[0037] This invention also includes a shielding plate 10, which is fitted around the moving conductive rod 4 and located between the moving contact 2 and the shielding cover 9. The outer diameter of the shielding plate 10 is larger than the inner diameter of the clearance hole 91. Specifically, the shielding plate 10 is fitted onto a stepped notch on the outer side of the moving conductive rod 4 and is confined within a limiting groove formed by the stepped notch and the moving contact 2. The arrangement of the shielding plate 10 and the shielding cover 9 allows for partial overlap, thereby completely shielding the electric arc and metal vapor, preventing contamination of the inner wall of the ceramic tube 8, and ensuring the insulation performance of the product after breakage.

[0038] In this embodiment, the moving contact 2 and the stationary contact 3 are CuCr alloy contacts, which reduce the circuit resistance of the product while ensuring breaking capacity. Furthermore, their strong breaking contact structure allows the product diameter to be less than or equal to 110mm (i.e., the outer diameter of the ceramic tube 8 is less than or equal to 110mm), thus enabling miniaturization and reducing space occupation. Because this invention places both the moving and stationary contacts completely within the lower sealing ring, the overall structure is compact. The elimination of the shielding cylinder and the addition of a shielding plate structure enhances the shielding effect, further saving space in the overall product structure. Increasing the contact diameter without increasing the overall product diameter, combined with other structural features, can enhance product performance.

[0039] The contact structure and vacuum interrupter of this utility model are identical to or can be implemented using existing technologies for the parts not described herein.

[0040] The above embodiments are only used to further illustrate a contact structure and vacuum interrupter of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A contact structure comprising a contact in the form of a plate provided with an arcuate groove extending through two surfaces in the thickness direction thereof, one end of the arcuate groove being located in a central region of the contact, the other end of the arcuate groove extending through an outer peripheral surface of the contact; characterized in that: The arc grooves comprise helical grooves extending in an Archimedes spiral and straight edge grooves, and the helical grooves and straight edge grooves are arranged in sequence along the arc grooves from one end to the other end.

2. The contact structure of claim 1, characterized in that: At least one surface of the contact in the thickness direction thereof comprises at least one contact surface and at least one non-contact surface located at the periphery of the contact surface, the thickness of the part of the contact provided with the non-contact surface gradually decreases in the direction outward in the radial direction of the contact, and / or the thickness of the part of the contact provided with the non-contact surface is smaller than the thickness of the part of the contact provided with the contact surface, so that the contact surface protrudes from the non-contact surface.

3. The contact structure of claim 2, characterized in that: The non-contact surface is located at the edge position of the contact, and the non-contact surface is a bevel or an arc surface.

4. The contact structure according to claim 2 or 3, characterized in that: Two surfaces of the contact in the thickness direction thereof respectively comprise the contact surface and the non-contact surface.

5. The contact structure of claim 2, wherein: The helical groove is located within the range of the contact surface, or a part of the helical groove is located within the range of the contact surface and the remaining part is located within the range of the non-contact surface.

6. The contact structure of claim 1, wherein: The length of the helical groove is greater than or equal to the length of the straight edge groove; the arc grooves are arranged in multiple, and the multiple arc grooves are arranged at intervals around the axis of the contact; and the center of the contact is provided with a connecting hole.

7. A vacuum interrupter comprising a contact set, the contact set comprising a movable contact and a stationary contact cooperating with each other; characterized in that: The movable contact and the fixed contact respectively adopt the contact structure according to any one of claims 1-6.

8. The vacuum interrupter of claim 7, wherein: The application further comprises a ceramic tube, a first sealing ring and a second sealing ring, the ceramic tube is arranged between the first sealing ring and the second sealing ring, the contact group is arranged in the first sealing ring, the fixed contact is connected with a fixed conductive rod which penetrates through the first sealing ring, the movable contact is connected with a movable conductive rod which penetrates through the second sealing ring; the application further comprises a shielding cover which is connected to the first sealing ring and / or the ceramic tube and isolates the ceramic tube and the contact group; the shielding cover is provided with a clearance hole corresponding to the movable conductive rod.

9. The vacuum interrupter of claim 8, wherein: The application further comprises a shielding plate which is sleeved outside the movable conductive rod and is arranged between the movable contact and the shielding cover, and the outer diameter of the shielding plate is greater than the inner diameter of the clearance hole.

10. The vacuum interrupter of claim 8, wherein: The movable contact and the fixed contact are CuCr alloy contacts, and the outer diameter of the ceramic tube is less than or equal to 110 mm.

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