Limiting pin capable of preventing point discharge

Abstract

The utility model discloses a limiting pin capable of preventing point discharge. The limiting pin capable of preventing point discharge comprises a pin assembly, a locking head and a locking structure, the locking head is provided with an inserting hole, and the end, away from the pin assembly, of the locking head is of a first spherical structure. Locking or unlocking of the pin assembly and the locking head is achieved through axial insertion and circumferential rotation. The first spherical structure eliminates sharp edges and corners, improves electric field distribution at the position of an electric power fitting, prevents overhigh electric field intensity, evenly spreads a concentrated electric field at the head of an existing cotter pin to a larger area, reduces local electric field intensity, and reduces noise pollution, light pollution and electric quantity loss caused by point discharge. Compared with traditional bolt connection, the locking mode that axial insertion is matched with circumferential rotation is simpler and more convenient, and the mounting and dismounting efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of power technology, and in particular to a limiting pin that can prevent tip discharge. Background Technology

[0002] Limit pins are widely used in power systems for locking and preventing loosening. Especially in the installation of electrical fittings, to prevent nuts on bolts from falling off due to vibration, radial through holes are made in the bolts, and limit pins are inserted into these holes to prevent the nuts from moving axially and falling off. Figure 4 , 5 These are two existing types of limit pins. Because one end of this type of limit pin has a sharp angle, it is prone to causing tip discharge when used in live equipment. Utility Model Content

[0003] The purpose of this invention is to provide a limiting pin that can prevent tip discharge, thereby solving the technical problem of existing limiting pins causing discharge when used in live equipment.

[0004] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides a limiting pin that can prevent tip discharge. The limiting pin that can prevent tip discharge includes a pin assembly, a locking head, and a locking structure disposed between the pin assembly and the locking head. The locking head has an insertion hole for inserting one end of the pin assembly. When the pin assembly is axially inserted into the insertion hole and rotated circumferentially, the locking structure enables the pin assembly to lock or unlock with the locking head.

[0005] The locking head, at the end furthest from the pin assembly, is constructed as a first spherical structure.

[0006] In some embodiments, the pin assembly includes a screw and a first tubular member sleeved on the screw. The locking structure includes a locking plate disposed at one end of the screw and a locking flange disposed on the inner wall of the insertion hole. When the pin assembly is inserted axially into the insertion hole and rotated circumferentially, the locking plate can be hooked and locked onto the locking flange or unlocked from the locking flange.

[0007] In some embodiments, the locking plate is provided with a first locking pin on the side facing the first tubular member, and the locking protrusion is provided with a first locking hole on the side facing away from the first tubular member for the first locking pin to be inserted.

[0008] In some embodiments, a first guide groove is provided on the side of the locking protrusion opposite to the first tubular member, the first guide groove coincides with the movement path of the first locking pin, and the first locking hole is located at the bottom of the first guide groove.

[0009] In some embodiments, a second locking pin is provided on the side of the locking protrusion facing away from the first tubular member, and a second locking hole is provided on the side of the locking plate facing the first tubular member for the second locking pin to be inserted.

[0010] In some embodiments, the locking plate is provided with a second guide groove on the side facing the first tubular member; the second guide groove coincides with the movement path of the second locking pin, and the second locking hole is located at the bottom of the second guide groove.

[0011] In some embodiments, the locking head includes a second tubular member and an end cap disposed at one end of the second tubular member to form an insertion hole, the first spherical structure being constructed at the end of the end cap away from the second tubular member, and the locking plate being disposed on the inner wall of the second tubular member.

[0012] In some embodiments, the locking structure further includes an elastic element that is clamped between the end cap and the locking plate.

[0013] In some embodiments, the locking structure further includes a sliding plate disposed within the second tubular member and located on the side of the locking plate away from the locking flange, and the elastic member clamping between the end cap and the sliding plate.

[0014] In some embodiments, the other end of the screw is provided with a limiting head, the end of the limiting head away from the first tubular member is provided with a second spherical structure, and the outer edge of the limiting head away from the first tubular member is provided with a second arc-shaped chamfer.

[0015] Compared with the prior art, the limiting pin of this utility model that can prevent tip discharge has at least the following beneficial effects:

[0016] This utility model discloses a limiting pin that can prevent tip discharge. The limiting pin includes a pin assembly, a locking head, and a locking structure. The locking head has an insertion hole, and the end of the locking head away from the pin assembly is a first spherical structure. Locking or unlocking of the pin assembly and the locking head is achieved through axial insertion and circumferential rotation. The first spherical structure eliminates sharp edges, improves the electric field distribution at the power fitting, prevents excessively high electric field strength, and distributes the concentrated electric field of the existing cotter pin head over a larger area, reducing local electric field strength and minimizing noise pollution, light pollution, and power loss caused by tip discharge (e.g., a reduction of local electric field strength of more than 40%). The axial insertion combined with circumferential rotation locking method is simpler than traditional bolt connections, improving installation and disassembly efficiency.

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A partial three-dimensional cross-sectional view of a limiting pin that can prevent tip discharge, provided for an embodiment of this utility model;

[0020] Figure 2 for Figure 1 A local magnification;

[0021] Figure 3 A partial three-dimensional cross-sectional view of the second tubular member of the limiting pin that can prevent tip discharge provided in this embodiment of the utility model.

[0022] Figure 4 and Figure 5 The diagram shows the structure of two existing limit pins.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Pin assembly; 11. Screw; 111. Limiting head; 112. Second spherical structure; 113. Second arc-shaped chamfer; 12. First tubular component;

[0025] 2. Locking head; 21. Second tubular component; 22. End cap; 221. First spherical structure;

[0026] 31. Locking plate; 311. First locking pin; 32. Locking flange; 321. First locking hole; 322. First guide groove; 33. Elastic element; 34. Slide plate. Detailed Implementation

[0027] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0028] In the description of this utility model, it should be clarified that the terms "first," "second," etc., in the specification, claims, and drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "back," "left," "right," "up," "down," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this utility model.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Example 1

[0031] like Figures 1-3 As shown, this utility model embodiment provides a limiting pin that can prevent tip discharge. The limiting pin that can prevent tip discharge includes a pin assembly 1, a locking head 2, and a locking structure disposed between the pin assembly 1 and the locking head 2. The locking head 2 has an insertion hole for inserting one end of the pin assembly 1. When the pin assembly 1 is inserted into the insertion hole axially and rotated circumferentially, the locking structure can lock or unlock the pin assembly 1 and the locking head 2.

[0032] The locking head 2, at the end furthest from the pin assembly 1, is constructed as a first spherical structure 221.

[0033] In this embodiment, the limiting pin that prevents tip discharge includes a pin assembly 1, a locking head 2, and a locking structure. The locking head 2 has an insertion hole, and the end of the locking head 2 away from the pin assembly 1 is a first spherical structure 221. The pin assembly 1 and the locking head 2 are locked or unlocked through axial insertion and circumferential rotation. The first spherical structure 221 eliminates sharp edges, improves the electric field distribution at the power fitting, prevents excessively high electric field strength, and distributes the concentrated electric field of the existing cotter pin head over a larger area, reducing the local electric field strength and reducing noise pollution, light pollution, and power loss caused by tip discharge (e.g., a reduction of more than 40% in local electric field strength). The axial insertion combined with the circumferential rotation locking method is simpler than traditional bolt connections, improving installation and disassembly efficiency.

[0034] The first spherical structure 221 of the locking head 2 adopts a curvature radius of R5-R8mm (complies with the anti-corona discharge design standard in GB / T 16927.1), and a surface roughness ≤Ra1.6μm, eliminating the phenomenon of charge concentration at the tip through the smooth curved surface. The axial depth of the insertion hole and the fit tolerance of the pin assembly insertion end are controlled within ±0.03mm, forming a precision stop structure. ANSYS simulation verification shows that the spherical structure can reduce the local electric field intensity by 42%-48%, avoiding corona discharge at a 10kV voltage level, and meeting the requirements of DL / T 405-2017 "Design Guidelines for Tools, Devices and Equipment for Live-Line Working on High Voltage".

[0035] The bottom of the blind hole is equipped with a 0.5mm deep dustproof groove, which, together with the silicone rubber sealing ring (not marked in the figure), can prevent dust intrusion with an IP54 rating. It is suitable for outdoor environments with humidity ≤95% and dust concentration ≤30mg / m³, and the maintenance cycle is extended to 2-3 years (traditional limit pins require annual maintenance).

[0036] The axial insertion mechanism, coupled with a 45° circumferential rotation locking mechanism, reduces the installation time per station to 15 seconds (compared to 45 seconds for traditional bolts), and requires no additional tools, making it suitable for high-altitude operations.

[0037] The spherical structure eliminates the concentration of charge at sharp points. The blind hole design prevents dust and moisture from entering the locking structure, making it suitable for humid or dusty outdoor environments and extending equipment maintenance cycles. The spherical end face prevents scratches from accidental contact by operators, complying with electrical safety operating procedures.

[0038] In some embodiments, the pin assembly 1 includes a screw 11 and a first tubular member 12 sleeved on the screw 11. The locking structure includes a locking plate 31 disposed at one end of the screw 11 and a locking flange 32 disposed on the inner wall of the insertion hole. When the pin assembly 1 is inserted axially into the insertion hole and rotates circumferentially, the locking plate 31 can be hooked and locked onto the locking flange 32 or unlocked from the locking flange 32.

[0039] In this embodiment, the pin assembly 1 includes a screw 11 and a first tubular member 12. The locking structure consists of a locking plate 31 at one end of the screw 11 and a locking flange 32 on the inner wall of the blind hole. During rotation, the locking plate 31 and the locking flange 32 engage or disengage. The engagement structure of the locking plate 31 and the locking flange 32 can withstand axial and circumferential loads, preventing the pin assembly from loosening and ensuring connection reliability. The combination of the screw 11 and the first tubular member 12 facilitates disassembly and replacement, reducing maintenance costs. The cooperation between the locking plate 31 and the locking flange 32 enables precise positioning of the pin assembly 1, meeting the accuracy requirements for electrical equipment docking.

[0040] In some embodiments, the locking plate 31 is provided with a first locking pin 311 on the side facing the first tubular member 12, and the locking protrusion 32 is provided with a first locking hole 321 for the first locking pin 311 to be inserted on the side facing away from the first tubular member 12.

[0041] In this embodiment, a first locking pin 311 is provided on the side of the locking plate 31 facing the first tubular member 12, and a first locking hole 321 is provided on the corresponding side of the locking flange 32. After the first locking pin 311 is inserted into the first locking hole 321, it can prevent the locking plate 31 and the locking flange 32 from being accidentally unlocked due to vibration or other factors, thereby enhancing the vibration resistance of the structure. The engagement of the first locking pin 311 with the first locking hole 321 further limits the position of the pin assembly 1 and avoids circumferential displacement.

[0042] In some embodiments, a first guide groove 322 is provided on the side of the locking protrusion 32 away from the first tubular member 12, the first guide groove 322 coincides with the moving path of the first locking pin 311, and the first locking hole 321 is located at the bottom of the first guide groove 322.

[0043] In this embodiment, the locking flange 32 is provided with a first guide groove 322, the path of which coincides with the moving path of the first locking pin 311, and the first locking hole 321 is located at the bottom of the first guide groove 322. The first guide groove 322 guides the first locking pin 311 to move along a predetermined path, avoiding jamming during insertion and reducing installation difficulty.

[0044] During rotation, the first locking pin 311 can slide into the first locking hole 321 along the first guide groove 322 to achieve "blind insertion" locking and improve operating efficiency.

[0045] In some embodiments, the locking flange 32 is provided with a second locking pin on the side opposite to the first tubular member 12, and the locking plate 31 is provided with a second locking hole on the side facing the first tubular member 12 for the second locking pin to be inserted.

[0046] In this embodiment, the locking flange 32 is provided with a second locking pin, and the corresponding side of the locking plate 31 is provided with a second locking hole. By engaging the second locking pin of the locking flange 32 with the second locking hole of the locking plate 31, bidirectional limiting is achieved, further enhancing locking stability. Bidirectional locking can disperse axial force, avoiding structural fatigue caused by excessive force on a single locking point.

[0047] In some embodiments, the locking plate 31 is provided with a second guide groove on the side facing the first tubular member 12; the second guide groove coincides with the movement path of the second locking pin, and the second locking hole is located at the bottom of the second guide groove.

[0048] In this embodiment, the locking plate 31 is provided with a second guide groove, the path of which coincides with the movement path of the second locking pin, and the second locking hole is located at the bottom of the second guide groove. The second guide groove provides guidance for the second locking pin, ensuring accurate alignment during bidirectional locking and improving the installation error tolerance. The second guide groove limits the movement range of the second locking pin, preventing damage to the locking structure due to misoperation.

[0049] In some embodiments, the locking head 2 includes a second tubular member 21 and an end cap 22 disposed at one end of the second tubular member 21 to form an insertion hole, the first spherical structure 221 being constructed at the end of the end cap 22 away from the second tubular member 21, and the locking plate 31 being disposed on the inner wall of the second tubular member 21.

[0050] In this embodiment, the locking head 2 consists of a second tubular member 21 and an end cap 22. The end of the end cap 22 has a first spherical structure 221, and the locking plate 31 is disposed on the inner wall of the second tubular member 21. The second tubular member 21 and the end cap 22 combine to form an insertion hole, simplifying the processing technology of the locking head and reducing manufacturing costs. In addition to preventing discharge, the first spherical structure 221 of the end cap 22 can also prevent scratches when operators touch it, which complies with the electrical safety operation specifications.

[0051] In some embodiments, the locking structure further includes an elastic element 33, which is clamped between the end cap 22 and the locking plate 31.

[0052] In this embodiment, the locking structure includes an elastic element 33, which is clamped between the end cap 22 and the locking plate 31. The elastic element 33 can absorb the vibration energy during equipment operation, prevent the locking plate 31 and the locking flange 32 from developing axial gaps due to vibration, and avoid loosening of the locking plate 31 and the locking flange 32. The deformation of the elastic element 33 can compensate for the small displacement of the components caused by temperature changes or assembly errors, maintaining the reliability of the locking structure.

[0053] In some embodiments, the locking structure further includes a slide plate 34 disposed within the second tubular member 21 and located on the side of the locking flange 32 away from the locking plate 31, and the elastic member 33 is clamped between the end cap 22 and the slide plate 34.

[0054] In this embodiment, the locking structure includes a sliding plate 34, located on the side of the locking plate 31 away from the locking flange 32. An elastic element 33 is clamped between the end cap 22 and the sliding plate 34. This ensures uniform transmission of elastic force. The sliding plate 34 can evenly transfer the force of the elastic element 33 to the locking plate 31, locking the locking flange 32 and the locking plate 31 together. The sliding plate 34, in cooperation with the elastic element 33, can automatically adjust the clamping force according to the locking state, ensuring that the locking plate 31 and the locking flange 32 are always in close contact.

[0055] In some embodiments, the other end of the screw 11 is provided with a limiting head 111, the end of the limiting head 111 away from the first tubular member 12 is provided with a second spherical structure 112, and the outer edge of the end of the limiting head 111 away from the first tubular member 12 is provided with a second arc-shaped chamfer 113.

[0056] In this embodiment, a limiting head 111 is provided at the other end of the screw 11. The end of the limiting head 111 away from the first tubular member 12 is a second spherical structure 112, and the outer edge of the end of the limiting head 111 away from the first tubular member 12 is provided with a second arc-shaped chamfer 113. The second spherical structure 112 and the second arc-shaped chamfer 113 further eliminate sharp points, reduce the risk of discharge in all directions, and are suitable for high-voltage environments.

[0057] The limiting head 111 prevents the screw 11 from being over-inserted, while the second spherical structure 112 acts as a buffer during equipment docking, protecting the connecting parts from damage.

[0058] The radius of curvature of the second spherical structure 112 is the same as that of the first spherical structure 221, and the radius of the second arc chamfer 113 is 0.8-1mm.

[0059] Double-ended insulation: The spherical structure combined with the arc-shaped chamfer increases the minimum safe distance between the two ends of the locating pin and the live parts by 15%, suitable for voltage levels of 35kV and below.

[0060] Mechanical buffer protection: The limit head can absorb ±0.5mm of axial displacement when the equipment expands and contracts with heat, avoiding flange deformation caused by stress concentration. Finite element analysis has verified that it can reduce local stress by 20%.

[0061] This utility model, through its spherical structure design, multi-dimensional locking structure, and elastic buffer design, solves the problem of discharge at the tip of traditional limit pins while improving installation convenience, structural stability, and environmental adaptability, making it particularly suitable for high-voltage and high-vibration scenarios in power equipment.

[0062] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0063] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A limiting pin for preventing tip discharge, characterized in that, The limiting pin that prevents tip discharge includes a pin assembly (1), a locking head (2), and a locking structure disposed between the pin assembly (1) and the locking head (2). The locking head (2) has an insertion hole for inserting one end of the pin assembly (1). When the pin assembly (1) is inserted into the insertion hole axially and rotated circumferentially, the locking structure enables the pin assembly (1) to lock or unlock with the locking head (2). The locking head (2) is configured with a first spherical structure (221) at the end away from the pin assembly (1).

2. The limiting pin for preventing tip discharge according to claim 1, characterized in that, The pin assembly (1) includes a screw (11) and a first tubular member (12) sleeved on the screw (11). The locking structure includes a locking plate (31) disposed at one end of the screw (11) and a locking flange (32) disposed on the inner wall of the insertion hole. When the pin assembly (1) is inserted into the insertion hole axially and rotated circumferentially, the locking plate (31) can be hooked and locked onto the locking flange (32) or unlocked from the locking flange (32).

3. The limiting pin for preventing tip discharge according to claim 2, characterized in that, The locking plate (31) is provided with a first locking pin (311) on the side facing the first tubular member (12), and the locking protrusion (32) is provided with a first locking hole (321) on the side away from the first tubular member (12) for the first locking pin (311) to be inserted.

4. The limiting pin for preventing tip discharge according to claim 3, characterized in that, The locking protrusion (32) is provided with a first guide groove (322) on the side opposite to the first tubular member (12). The first guide groove (322) coincides with the moving path of the first locking pin (311). The first locking hole (321) is located at the bottom of the first guide groove (322).

5. The limiting pin for preventing tip discharge according to any one of claims 2-4, characterized in that, The locking protrusion (32) is provided with a second locking pin on the side away from the first tubular member (12), and the locking plate (31) is provided with a second locking hole on the side facing the first tubular member (12) for the second locking pin to be inserted.

6. The limiting pin for preventing tip discharge according to claim 5, characterized in that, The locking plate (31) is provided with a second guide groove on the side facing the first tubular member (12); the second guide groove coincides with the moving path of the second locking pin, and the second locking hole is located at the bottom of the second guide groove.

7. The limiting pin for preventing tip discharge according to claim 2, characterized in that, The locking head (2) includes a second tubular member (21) and an end cap (22) disposed at one end of the second tubular member (21) to form an insertion hole. The first spherical structure (221) is constructed at the end of the end cap (22) away from the second tubular member (21), and the locking plate (31) is disposed on the inner wall of the second tubular member (21).

8. The limiting pin for preventing tip discharge according to claim 7, characterized in that, The locking structure also includes an elastic element (33), which is held between the end cap (22) and the locking plate (31).

9. The limiting pin for preventing tip discharge according to claim 8, characterized in that, The locking structure further includes a sliding plate (34), which is disposed inside the second tubular member (21) and located on the side of the locking plate (31) away from the locking flange (32). The elastic member (33) is clamped between the end cap (22) and the sliding plate (34).

10. The limiting pin for preventing tip discharge according to claim 9, characterized in that, The other end of the screw (11) is constructed with a limiting head (111). The end of the limiting head (111) away from the first tubular member (12) is constructed as a second spherical structure (112). The outer edge of the limiting head (111) away from the first tubular member (12) is provided with a second arc-shaped chamfer (113).

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