A contact centering device and method

Abstract

This invention relates to the field of high-voltage switch technology and discloses a contact alignment device and method. The contact alignment device includes a contact alignment fixture and a measuring fixture. The contact alignment fixture further includes four alignment blocks, several clamping rings, and butterfly nuts. The four alignment blocks can be connected and assembled into a cylindrical body. The upper center of the cylindrical body has a first electrode contact receiving cavity, and the lower center has a second electrode contact receiving cavity. The cylindrical body is fixed externally by clamping rings, each clamping ring being fastened by a corresponding butterfly nut. The measuring fixture includes a protruding block and a concave block that are connected by threads at their mating portions. The corresponding outer end faces of the protruding block and the concave block are both planar. This invention can significantly improve the alignment accuracy of the trigger gap electrode contacts, ensure the electrode alignment of the trigger module, improve product reliability, and thus reduce product installation and maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switch technology, and more specifically, to a contact centering device and method. Background Technology

[0002] When a large oil-filled equipment such as an ultra-high voltage converter transformer experiences an internal short-circuit fault, the fault develops rapidly, and through a new type of grounding trigger gap (structure such as...) Figures 1-3 (As shown) The ultra-fast bypass fault current can extinguish the internal arcing of faults in UHV converter transformers, avoiding catastrophic accidents caused by fault deflagration. Upon receiving a trigger command, the new type of grounding trigger gap determines that the gap voltage meets the trigger range. The trigger cavities in the upper and lower contacts of the gap body discharge, generating plasma jets and quickly and reliably triggering the gap to conduct. This requires extremely high alignment of the trigger cavities at the upper and lower poles of the contacts.

[0003] Currently, the alignment of contacts in high-voltage switchgear is mostly ensured through a stop structure. The alignment accuracy requirements for contacts in ordinary switches are not high, and the existing assembly system can meet their needs. However, grounding trigger gap products require extremely high alignment accuracy for the electrical contacts, and the internal installation space of the contacts is very small. If the ordinary installation method is used, the alignment accuracy of the contacts cannot meet the requirements, which will eventually lead to triggering failure.

[0004] Therefore, the current centering devices and methods for grounding trigger gap products need to solve the following technical problems:

[0005] (1) Ensure the alignment accuracy of the trigger gap electrode contacts; (2) Portability of tooling installation: Due to the extremely small space of the trigger cavity, the tooling must be able to be installed and disassembled in a very small space. (3) Ensure the safety of the tooling and prevent damage to the electrode contact surface during installation and disassembly; (4) The accuracy of the measuring tool can effectively verify the centering accuracy. Summary of the Invention

[0006] In view of this, the present invention proposes a contact alignment device and method that can solve the above technical problems, the specific technical solution of which is as follows: A contact centering device, comprising: The contact centering fixture includes four centering blocks, several clamping rings, and butterfly nuts. The four centering blocks can be connected and assembled into a cylindrical body. The upper middle of the cylindrical body has a first electrode contact receiving cavity, and the lower middle has a second electrode contact receiving cavity. The corresponding cavity surfaces of the first and second electrode contact receiving cavities are consistent with the electrode contact end surface, and an inclined space is provided for the electrode contact end to correct its angle. The cylindrical body is fixed externally by the clamping rings, and each clamping ring is fastened by a corresponding butterfly nut. The measuring fixture includes a protrusion and a concave block that are in contact with each other. The protrusion and the concave block are connected by threads, and the corresponding outer end faces of the protrusion and the concave block that are opposite to each other are both planes.

[0007] Preferably, the centering block is made of any one of rubber, nylon, or polytetrafluoroethylene.

[0008] Preferably, the clamping ring is made of steel or aluminum alloy.

[0009] Preferably, the measuring fixture is made of any one of rubber, nylon, or polytetrafluoroethylene.

[0010] Preferably, the distance between the first electrode contact receiving cavity and the second electrode contact receiving cavity is consistent with the installation distance between the upper and lower electrode contacts.

[0011] Preferably, a plurality of the clamping rings secure the four-lobed centering block along the axial direction of the cylindrical body.

[0012] Preferably, the protrusion is a stud block and the concave block is a nut block.

[0013] A contact alignment method, using one of the contact alignment devices described above, includes the following steps: S1. Before installing the contact centering fixture, ensure that the electrode contacts are not tightened. Then, install four centering blocks in sequence on the outside of the electrode contacts, and then install the clamping ring and tighten it with butterfly nuts. S2. After the contact centering fixture is fully tightened, tighten the upper and lower electrode contacts, and then remove the contact centering fixture. S3. Use a measuring fixture to measure the circumference between the upper and lower electrode contacts to confirm that the electrode contacts are correctly aligned. S4. Proceed to the next step of the installation.

[0014] Compared with the prior art, the contact alignment device and method of the present invention have the following beneficial effects: (1) The present invention can significantly improve the alignment accuracy of the trigger gap electrode contacts, ensure the electrode alignment of the trigger module, improve product reliability, and thus reduce the installation and maintenance costs of the product.

[0015] (2) The contact centering fixture in the contact centering device of the present invention can meet the requirements of installation and disassembly of the fixture in a very small space, and does not cause damage to the surface of the electrode contact during installation and disassembly. At the same time, the contact centering fixture can ensure that the electrode contact is installed in one go, which greatly improves the installation efficiency.

[0016] (3) The measuring fixture in the contact centering device of the present invention can effectively check the centering accuracy to ensure the electrode centering effect and ensure that the contact spacing is within the required range.

[0017] (4) Each tooling in the contact centering device of the present invention can be reused. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the new type of grounding trigger gap body.

[0020] Figure 2 for Figure 1 The external overall structure diagram of the trigger electrode indicated by point A in the middle.

[0021] Figure 3 for Figure 2 A schematic diagram of the structure of the electrode contact end face in the trigger electrode.

[0022] Figure 4 This is a schematic diagram of the overall structure of the contact centering tooling in this invention.

[0023] Figure 5 This is a schematic diagram of the centering block in this invention.

[0024] Figure 6 This is a schematic diagram of the clamping ring and butterfly nut in this invention.

[0025] Figure 7 This is an external schematic diagram of a contact centering fixture used to center and adjust the trigger electrode.

[0026] Figure 8 This is an internal schematic diagram illustrating the centering and adjustment of the trigger electrode using a contact centering fixture (during the adjustment process).

[0027] Figure 9 This is an internal schematic diagram illustrating the centering and adjustment of the trigger electrode using a contact centering fixture (adjustment complete).

[0028] Figure 10 This is a schematic diagram of the overall structure of the measuring fixture in this invention.

[0029] Figure 11 This is a schematic diagram illustrating the use of the measuring tool.

[0030] In the figure: 1-Contact centering fixture, 101-Centering block, 102-Clamping ring, 103-Butterfly nut, 104-First electrode contact receiving cavity, 105-Second electrode contact receiving cavity; 2-Measuring fixture, 201-Protrusion, 202-Concave block; 3-Electrode contact. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 invention 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 invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] Example: This invention provides a contact centering device, such as... Figures 4-10 As shown, it includes contact centering fixture 1 and measuring fixture 2.

[0035] See Figures 4-6The contact centering fixture 1 includes a four-lobed centering block 101 and several (specifically three in this embodiment) clamping rings 102 and butterfly nuts 103. The four-lobed centering blocks 101 can be connected and assembled into a cylindrical body. The upper middle of the cylindrical body has a first electrode contact receiving cavity 104, and the lower middle has a second electrode contact receiving cavity 105. The corresponding cavity surfaces of the first electrode contact receiving cavity 104 and the second electrode contact receiving cavity 105 are consistent with the electrode contact end surface, and an inclined space is left for the electrode contact end to correct the angle (see [reference]). Figure 8 The external shape of the cylindrical body is fixed by a clamping ring 102, and each clamping ring 102 is fastened by a butterfly nut 103.

[0036] In this specific embodiment, the centering block 101 is made of any one of rubber, nylon, or polytetrafluoroethylene. This type of material can prevent the centering block from scratching the electrode contact surface and also reduce the weight of the centering block itself. Meanwhile, the clamping ring 102 is made of steel or aluminum alloy.

[0037] In this specific embodiment, several clamping rings 102 fasten the four-lobed centering block 101 along the axial direction of the cylindrical body.

[0038] The contact centering fixture in this invention adopts an installation method of four-lobed centering blocks joined together and fastened with a clamping ring, which can be easily installed and disassembled in a very small space. Moreover, the internal arc surface of the contact centering fixture has the same size as the arc surface of the electrode contact end, and the height of its contact receiving cavity is increased to a certain extent compared with the actual contact height. This not only facilitates the installation of the electrode contact, but also facilitates the centering adjustment of the electrode contact (i.e., correcting electrode contacts that are tilted at a certain angle).

[0039] See Figure 10 The measuring fixture 2 includes a protrusion 201 and a concave block 202 that are in contact with each other. The protrusion 201 and the concave block 202 are connected by threads, and the corresponding outer end faces of the protrusion 201 and the concave block 202 that are opposite to each other are both planes.

[0040] More specifically, the protrusion 201 is a stud block, and the concave block 202 is a nut block.

[0041] In this invention, the protrusion 201 and concave block 202 in the measuring fixture 2 can be extended and retracted via threads. Measurements are performed by adjusting the height to allow for the dispersed measurement of dimensions at multiple locations after the electrode contact 3 is installed and tightened (see reference). Figure 11 This involves determining whether consistency is maintained and verifying whether the contact spacing is within the required range.

[0042] In this specific embodiment, the measuring fixture 2 is made of any one of rubber, nylon, or polytetrafluoroethylene. Similarly, this type of material can prevent the measuring fixture from scratching the electrode contact surface, while also reducing the weight of the measuring fixture itself.

[0043] In this specific embodiment, the distance between the first electrode contact receiving cavity 104 and the second electrode contact receiving cavity 105 is consistent with the installation distance between the upper and lower electrode contacts, so as to ensure the electrode contact installation distance during installation.

[0044] The present invention also provides a contact alignment method, which uses one of the contact alignment devices described above and includes the following steps: S1. Before installing the contact centering fixture, ensure that the electrode contacts are not tightened. Then, install four centering blocks in sequence on the outside of the electrode contacts, and then install the clamping ring and tighten it with butterfly nuts. S2. After the contact centering fixture is fully tightened, tighten the upper and lower electrode contacts to ensure proper installation and centering. S3. After the upper and lower electrode contacts are tightened, remove the contact centering fixture; S4. Use a measuring fixture to measure the circumference between the upper and lower electrode contacts to confirm that the electrode contacts are correctly aligned. S5. Proceed to the next step of the installation.

[0045] This invention provides a contact alignment device and method that can significantly improve the alignment accuracy of trigger gap electrode contacts, ensuring electrode alignment, improving product reliability, and thus reducing product installation and maintenance costs. Simultaneously, the contact alignment fixture in the device allows for installation and disassembly within a very small space without damaging the electrode contact surface during installation and disassembly. The measuring fixture in the device can also effectively verify the alignment accuracy.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A contact centering device, characterized in that, include: The contact centering fixture includes four centering blocks, several clamping rings, and butterfly nuts. The four centering blocks can be connected and assembled into a cylindrical body. The upper middle of the cylindrical body has a first electrode contact receiving cavity, and the lower middle has a second electrode contact receiving cavity. The corresponding cavity surfaces of the first and second electrode contact receiving cavities are consistent with the electrode contact end surface, and an inclined space is provided for the electrode contact end to correct its angle. The cylindrical body is fixed externally by the clamping rings, and each clamping ring is fastened by a corresponding butterfly nut. The measuring fixture includes a protrusion and a concave block that are in contact with each other. The protrusion and the concave block are connected by threads, and the corresponding outer end faces of the protrusion and the concave block that are opposite to each other are both planes.

2. The contact alignment device according to claim 1, characterized in that, The centering block is made of any one of rubber, nylon, or polytetrafluoroethylene.

3. The contact alignment device according to claim 1, characterized in that, The clamping ring is made of steel or aluminum alloy.

4. The contact alignment device according to claim 1, characterized in that, The measuring fixture is made of any one of rubber, nylon, or polytetrafluoroethylene.

5. A contact alignment device according to claim 1, characterized in that, The distance between the first electrode contact receiving cavity and the second electrode contact receiving cavity is consistent with the installation distance between the upper and lower electrode contacts.

6. A contact alignment device according to claim 1, characterized in that, Several clamping rings secure the four-lobed centering block along the axial direction of the cylindrical body.

7. A contact alignment device according to claim 1, characterized in that, The protrusion is a stud block, and the concave block is a nut block.

8. A contact alignment method, using a contact alignment device according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Before installing the contact centering fixture, ensure that the electrode contacts are not tightened. Then, install four centering blocks in sequence on the outside of the electrode contacts, and then install the clamping ring and tighten it with butterfly nuts. S2. After the contact centering fixture is fully tightened, tighten the upper and lower electrode contacts, and then remove the contact centering fixture. S3. Use a measuring fixture to measure the circumference between the upper and lower electrode contacts to confirm that the electrode contacts are correctly aligned. S4. Proceed to the next step of the installation.

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