An equalizing electric field solid-seal pole

Abstract

The utility model discloses a kind of equalization electric field fixed sealing pole, comprising: pole body, moving contact, vacuum arc-extinguishing chamber, static contact seat and external component;Along the axial direction of pole body, the middle part is provided with the installation cavity through both ends;Moving contact is arranged in one end of installation cavity;Vacuum arc-extinguishing chamber is arranged in installation cavity;Static contact seat is arranged in installation cavity, and its one end is connected with moving contact, and the other end is connected with the one end of vacuum arc-extinguishing chamber close to moving contact;External component one end is connected in the one end of vacuum arc-extinguishing chamber away from static contact seat, and the other end is arranged in the one end of installation cavity away from moving contact. To solve the discharge problem caused by uneven electric field.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment, and in particular to a solid-sealed pole for balancing electric fields. Background Technology

[0002] Solid-sealed poles are important components of switchgear. They typically contain a vacuum interrupter within their pole body, and a moving contact is located at one end. The vacuum interrupter is directly connected to the moving contact at one end, so it is usually located at one end of the pole body. When the solid-sealed pole is energized, the vacuum interrupter generates an electric field. Since the vacuum interrupter is located at one end of the pole body, the electric field of the entire solid-sealed pole will be concentrated at one end, leading to imbalance. This concentration of the electric field can easily cause discharge risks. Utility Model Content

[0003] In order to overcome at least one of the defects described in the prior art, the present invention provides a balanced electric field solid-sealed electrode to solve the discharge problem caused by electric field imbalance.

[0004] The technical solution adopted by this utility model to solve its problem is:

[0005] A uniform electric field solid-sealed pole, comprising:

[0006] The electrode body has a mounting cavity extending through both ends in its central part along the axial direction of the electrode body.

[0007] A moving contact is disposed at one end of the mounting cavity;

[0008] A vacuum interrupter is disposed in the mounting cavity;

[0009] A stationary contact seat is disposed in the mounting cavity, with one end connected to the moving contact and the other end connected to the end of the vacuum interrupter chamber near the moving contact;

[0010] An external component is connected at one end to the end of the vacuum interrupter chamber away from the stationary contact seat, and at the other end to the mounting cavity away from the moving contact.

[0011] Furthermore, along the axial direction of the mounting cavity, the mounting cavity is sequentially divided into a first end cavity, a middle cavity, and a second end cavity;

[0012] The vacuum interrupter is disposed in the central cavity, and the moving contact is located on the outside of the first end cavity.

[0013] Furthermore, the stationary contact seat has a cylindrical structure.

[0014] Furthermore, the stationary contact seat includes a first cylindrical segment and a second cylindrical segment that are axially connected;

[0015] The diameter of the second cylindrical segment is larger than the diameter of the first cylindrical segment. The moving contact is connected to the end of the second cylindrical segment away from the first cylindrical segment. The end of the first cylindrical segment away from the second cylindrical segment is connected to the vacuum interrupter.

[0016] Furthermore, the connection between the first cylindrical segment and the second cylindrical segment is transitioned by a beveled surface or a circular arc surface.

[0017] Furthermore, the stationary contact seat also includes a third cylindrical segment connected axially, the third cylindrical segment being disposed at the end of the first cylindrical segment away from the second cylindrical segment;

[0018] The diameter of the third cylindrical segment is greater than the diameter of the first cylindrical segment.

[0019] Furthermore, the connection between the first cylindrical segment and the third cylindrical segment is transitioned by a beveled surface or a circular arc surface.

[0020] Furthermore, it also includes connectors;

[0021] A countersunk hole is provided in the radial center of the stationary contact seat, the moving contact is connected to the opening of the countersunk hole, the connector is disposed in the countersunk hole and passes through the bottom of the countersunk hole to connect to the vacuum interrupter.

[0022] Furthermore, the outer wall of the pole body is provided with a plurality of annular protrusions, which are distributed at intervals along the axial direction of the pole body and form an umbrella skirt.

[0023] Furthermore, the annular protrusion includes a plurality of first protruding rings and a plurality of second protruding rings, the first protruding rings and the second protruding rings being alternately arranged, and the outer ring diameter of the first protruding ring is larger than the outer ring diameter of the second protruding ring.

[0024] In summary, the balanced electric field solid-sealed electrode provided by this utility model has the following technical effects:

[0025] This application provides a transitional stationary contact seat between the vacuum interrupter and the moving contact, allowing the vacuum interrupter to be positioned closer to the center of the electrode body. The electric field generated by the vacuum interrupter, located closer to the center of the electrode body, can be evenly distributed across the electrode body, thereby achieving an overall balanced electric field for the sealed electrode. This reduces the risk of discharge due to electric field imbalance and improves the safety of using the sealed electrode. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the structure of an embodiment of the present utility model.

[0027] The meanings of the reference numerals in the attached figures are as follows:

[0028] 10. Pole post body; 20. Moving contact; 30. Vacuum interrupter; 40. External component; 41. Moving terminal; 42. Disc spring drive rod; 43. Lower contact seat; 50. Connector; 60. Stationary contact seat; 61. First cylindrical section; 62. Second cylindrical section; 601. Countersunk hole; 63. Third cylindrical section; 70. Umbrella skirt; 71. First convex ring; 72. Second convex ring. Detailed Implementation

[0029] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0030] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0032] A solid-sealed pole is a component that integrates a vacuum interrupter and related conductive parts of a circuit breaker into a single unit, which is formed by embedding the vacuum interrupter and the circuit breaker into a solid insulating material such as epoxy resin or thermoplastic material that is easy to cure.

[0033] See Figure 1 This utility model discloses a balanced electric field solidified pole, including pole body 10, moving contact 20, vacuum interrupter 30, stationary contact seat 60 and external component 40.

[0034] The pole body 10 has a mounting cavity extending through both ends along its axial center. A moving contact 20 is located at one end of the mounting cavity. A vacuum interrupter 30 is located within the mounting cavity. A stationary contact seat 60 is located within the mounting cavity, with one end connected to the moving contact 20 and the other end connected to the end of the vacuum interrupter 30 closest to the moving contact 20. An external assembly 40 is connected at one end to the end of the vacuum interrupter 30 furthest from the stationary contact seat 60, and the other end is located at the end of the mounting cavity furthest from the moving contact 20.

[0035] As is known from existing technology, the electrode body 10 is typically formed by epoxy casting and usually has a cylindrical outer contour, which will not be elaborated here. An installation cavity is provided in the middle of the electrode body 10, extending through the entire electrode body 10 axially.

[0036] It should be noted that the external assembly 40 typically consists of a moving terminal 41, a disc spring drive rod 42, and a lower contact seat 43. The moving terminal 41 is movably disposed at the end of the vacuum interrupter 30 away from the stationary contact seat 60. The disc spring drive rod 42 is disposed in the mounting cavity, with one end extending to the end of the mounting cavity away from the moving contact 20. The lower contact seat 43 is disposed at the end of the mounting cavity away from the moving contact 20 to fix the disc spring drive rod 42. Importantly, the moving terminal 41 reciprocates along the axial direction of the mounting cavity, allowing it to contact and close or disconnect with the end of the disc spring drive rod 42 located within the mounting cavity, thereby achieving connection or disconnection of the sealed electrode. Furthermore, the actuation of the moving terminal 41 is prior art and will not be elaborated further.

[0037] Compared to the prior art where the vacuum interrupter 30 is directly connected to the moving terminal 41 at one end of the pole body 10, and the vacuum interrupter 30 is closer to the end of the pole body 10, in this application the moving contact 20 and the vacuum interrupter 30 are connected through the stationary contact seat 60. The vacuum interrupter 30 is located closer to the middle of the pole body 10 or even directly in the middle of the pole body 10. The electric field generated by the vacuum interrupter 30 in the middle position is evenly distributed in the space of the pole body 10, which better balances the electric field at each position of the solidified pole and prevents the discharge risk caused by electric field concentration.

[0038] Optionally, along the axial direction of the mounting cavity, the mounting cavity is divided into a first end cavity, a middle cavity, and a second end cavity in sequence.

[0039] The vacuum interrupter 30 is disposed in the middle cavity, and the moving contact 20 is located on the outside of the first end cavity.

[0040] In this embodiment, to position the vacuum interrupter 30 closer to the center of the mounting cavity, the mounting cavity is divided into three parts as described above. Preferably, the three parts are evenly divided. The vacuum interrupter 30 is positioned in the central cavity. Preferably, the center of the vacuum interrupter 30 coincides with the center of the central cavity. This better ensures that the vacuum interrupter 30 is located at the center of the mounting cavity, thereby achieving the aforementioned effect of balancing the electric field.

[0041] It is understood that, in addition to mounting the moving contact 20, the stationary contact 60 also needs to conduct electricity. Therefore, the stationary contact 60 is made of a conductive material, including but not limited to metals. Optionally, the stationary contact 60 has a cylindrical structure. The cylindrical structure of the stationary contact 60 results in a more uniform electric field distribution, which also helps to balance the electric field and prevent the problem of electric field concentration caused by irregular shapes.

[0042] Optionally, the stationary contact 60 includes a first cylindrical segment 61 and a second cylindrical segment 62 connected axially along the pole body 10. The diameter of the second cylindrical segment 62 is larger than the diameter of the first cylindrical segment 61. The moving contact 20 is located at the end of the second cylindrical segment 62 away from the first cylindrical segment 61, and the end of the first cylindrical segment 61 away from the second cylindrical segment 62 is connected to the vacuum interrupter 30.

[0043] It's important to understand that the current flow in the solid-sealed terminal is sequentially through the moving contact 20, the stationary contact 60, and the external assembly 40. The moving contact 20 serves as the input terminal, which typically generates more heat. The diameter of the second cylindrical segment 62 is larger than that of the first cylindrical segment 61, and the outer end face of the second cylindrical segment 62 is also larger. Connecting to the moving contact 20 via the second cylindrical segment 62 provides a larger heat dissipation area, improving heat dissipation. Furthermore, the larger the diameter of the second cylindrical segment 62, the lower the current density and the less heat generated. On the other hand, the smaller diameter of the first cylindrical segment 61 compared to the second cylindrical segment 62 ensures sufficient wall thickness within the mounting cavity to meet overall structural strength requirements.

[0044] In other embodiments, a third columnar segment 63 may be provided at the end of the first columnar segment 61 that is away from the second columnar segment 62. The diameter of the third columnar segment 63 may also be larger than that of the first columnar segment 61 (in this embodiment, the diameters of the first columnar segment 61, the third columnar segment 63 and the first columnar segment 61 are reduced accordingly). The main reason for this arrangement is that the third columnar segment 63 can provide a mounting end face with a sufficient area for stable installation with the vacuum interrupter 30.

[0045] Optionally, the connection between the first cylindrical segment 61 and the second cylindrical segment 62, as well as the connection between the first cylindrical segment 61 and the third cylindrical segment 63, can be transitioned using a sloped surface or a circular arc surface.

[0046] The beveled or rounded surface at the connection point eliminates the corner structure, improves the overall cylindricity of the stationary contact 60, and enhances its electric field balance. Alternatively, the beveled surface can be replaced with a rounded corner.

[0047] Optionally, connector 50 is also included.

[0048] The stationary contact seat 60 has a countersunk hole 601 in the radial center. The moving contact 20 is connected to the opening of the countersunk hole 601. The connector 50 is disposed in the countersunk hole 601 and passes through the bottom of the countersunk hole 601 to connect to the vacuum interrupter 30.

[0049] The connector 50 can be a bolt, which is threaded into the vacuum interrupter 30 within the countersunk hole 601. More importantly, in this embodiment, the countersunk hole 601 provides a connection point for the connector 50. While connecting to the vacuum interrupter 30, the connector 50 can be hidden in a vacuum, without occupying additional space within the mounting cavity, thus improving the overall compactness of the solid-sealed pole structure.

[0050] Optionally, the outer wall of the pole body 10 is provided with a plurality of annular protrusions, which are distributed at intervals along the axial direction of the pole body 10 and form a skirt 70.

[0051] Among them, the annular protrusion can increase the surface area of ​​the electrode body 10 and enhance the heat dissipation capacity; in addition, the annular protrusion increases the creepage path on the surface of the electrode body 10, thereby increasing the creepage distance at both ends of the electrode body 10 and enhancing electrical safety.

[0052] Optionally, the annular protrusion includes a plurality of first protruding rings 71 and a plurality of second protruding rings 72. The first protruding rings 71 and the second protruding rings 72 are arranged alternately along the axial direction of the electrode body 10, and the outer ring diameter of the first protruding ring 71 is larger than the outer ring diameter of the second protruding ring 72, thereby forming a spatial misalignment at the top of the adjacent first protruding ring 71 and the top of the second protruding ring 72, avoiding mutual inductive discharge between the tops of the two.

[0053] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A uniform electric field solid-sealed electrode, characterized in that, include: The pole body (10) has a mounting cavity extending through both ends in its middle part along the axial direction of the pole body (10). The moving contact (20) is disposed at one end of the mounting cavity; A vacuum interrupter (30) is disposed in the mounting cavity; A stationary contact seat (60) is disposed in the mounting cavity, with one end connected to the moving contact (20) and the other end connected to the end of the vacuum interrupter (30) near the moving contact (20); An external component (40) is connected at one end to the vacuum interrupter (30) away from the stationary contact (60), and at the other end to the mounting cavity away from the moving contact (20).

2. The balanced electric field solid-sealed pole according to claim 1, characterized in that, Along the axial direction of the mounting cavity, the mounting cavity is sequentially divided into a first end cavity, a middle cavity, and a second end cavity; The vacuum interrupter (30) is disposed in the central cavity, and the moving contact (20) is located outside the first end cavity.

3. The balanced electric field solid-sealed pole according to claim 1 or 2, characterized in that, The stationary contact seat (60) has a cylindrical structure.

4. The balanced electric field solid-sealed pole according to claim 3, characterized in that, The stationary contact seat (60) includes a first cylindrical segment (61) and a second cylindrical segment (62) that are axially connected. The diameter of the second cylindrical segment (62) is greater than the diameter of the first cylindrical segment (61). The moving contact (20) is connected to the end of the second cylindrical segment (62) away from the first cylindrical segment (61). The end of the first cylindrical segment (61) away from the second cylindrical segment (62) is connected to the vacuum interrupter (30).

5. The balanced electric field solid-sealed pole according to claim 4, characterized in that, The connection between the first cylindrical segment (61) and the second cylindrical segment (62) is transitioned by a bevel or a circular arc.

6. The balanced electric field solid-sealed pole according to claim 4, characterized in that, The static contact base (60) further includes a third cylindrical segment (63), which is disposed at the end of the first cylindrical segment (61) away from the second cylindrical segment (62); The diameter of the third columnar segment (63) is greater than the diameter of the first columnar segment (61).

7. The balanced electric field solid-sealed pole according to claim 6, characterized in that, The connection between the first columnar segment (61) and the third columnar segment (63) is transitioned by a slope or a circular arc.

8. The balanced electric field solid-sealed pole according to claim 1, 4, 5, 6 or 7, characterized in that, It also includes connectors (50); The stationary contact seat (60) has a countersunk hole (601) in the radial center. The moving contact (20) is connected to the opening of the countersunk hole (601). The connector (50) is disposed in the countersunk hole (601) and passes through the bottom of the countersunk hole (601) to connect to the vacuum interrupter (30).

9. The balanced electric field solid-sealed pole according to claim 1, characterized in that, The outer wall of the pole body (10) is provided with a plurality of annular protrusions, which are distributed at intervals along the axial direction of the pole body (10) and form a skirt (70).

10. The balanced electric field solid-sealed pole according to claim 9, characterized in that, The annular protrusion includes a plurality of first protruding rings (71) and a plurality of second protruding rings (72), the first protruding rings (71) and the second protruding rings (72) are alternately arranged, and the outer ring diameter of the first protruding ring (71) is larger than the outer ring diameter of the second protruding ring (72).

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