Stable installation of oil-immersed three-dimensional volume core transformer and assembly method

Abstract

This application relates to the technical field of power transformers, and in particular to a stable oil-immersed three-dimensional wound core transformer and its assembly method. The transformer includes an oil tank cover and a high-voltage porcelain insulator and a clamping component detachably connected to the oil tank cover. The clamping component includes a clamping part that abuts against the high-voltage porcelain insulator. This application, through the design of the detachable high-voltage porcelain insulator and the clamping component, facilitates the maintenance or replacement of the high-voltage porcelain insulator and enhances the stability of the transformer through the abutting action of the clamping part, reducing the risk of loosening due to vibration or external forces.

Description

Technical Field

[0001] This application relates to the field of power transformers, and in particular to a stable oil-immersed three-dimensional wound core transformer and its assembly method. Background Technology

[0002] Oil-immersed transformers are a new type of high-performance transformer with a more rational structure and superior performance. Currently, oil-immersed transformers dominate the power system due to their excellent heat dissipation and large capacity. In recent years, three-dimensional wound core transformers have gradually replaced traditional laminated core structures due to their advantages such as symmetrical magnetic circuits and low no-load losses.

[0003] Because high-voltage porcelain insulators require frequent maintenance or replacement, they are typically detachably mounted on the tank cover. However, in existing technologies, the reliability of securing high-voltage porcelain insulators remains insufficient for the stable installation of oil-immersed three-dimensional wound core transformers. Summary of the Invention

[0004] To improve the fixing reliability of high-voltage porcelain insulators, this application provides a stable oil-immersed three-dimensional wound core transformer and its assembly method.

[0005] This application provides a stable oil-immersed three-dimensional wound core transformer and its assembly method, which adopts the following technical solution:

[0006] A stable oil-immersed three-dimensional wound core transformer includes an oil tank cover and a high-voltage porcelain insulator and a clamping component detachably connected to the oil tank cover. The clamping component includes a clamping part that abuts against the high-voltage porcelain insulator.

[0007] By adopting the above technical solution, compared with directly threading the high-pressure porcelain insulator to the fuel tank cover, the design of the detachable high-pressure porcelain insulator and the clamping part not only facilitates the maintenance or replacement of the high-pressure porcelain insulator, but also enhances the fixing stability through the clamping part's resistance, reducing the risk of loosening caused by vibration or external force.

[0008] Optionally, the clamping element is threaded onto the tank cover.

[0009] By adopting the above technical solution, the threaded connection between the clamping component and the fuel tank cap provides a fixing method with higher mechanical strength, further improving installation stability. At the same time, it simplifies the assembly process. Furthermore, the depth of the clamping component's thread screwing into the fuel tank cap can be adjusted according to the axial dimension of the part of the high-pressure porcelain insulator that is being fixed, making the clamping component applicable to high-pressure porcelain insulators of different sizes, improving the applicability of the clamping component, and reducing the dimensional accuracy requirements of the high-pressure porcelain insulator.

[0010] Optionally, the clamping part includes a pressure-bearing end and a clamping end, wherein the pressure-bearing end is used to withstand the pressure from the bolt head or nut, and the clamping end is used to abut against the high-pressure porcelain insulator.

[0011] By adopting the above technical solution, the pressure-bearing end and the clamping end are set separately, so that the bolt pressure and the contact force between the porcelain insulator are distributed and transmitted, avoiding local stress concentration, minimizing the risk of the clamping component breaking under pressure, and extending the service life of the clamping component and the high-pressure porcelain insulator.

[0012] Optionally, a nut is also included. A stud is integrally formed on the side wall of the fuel tank cover near the clamping member. The clamping member has a through mounting hole for the stud to pass through. The clamping member is fixed to the fuel tank cover by the nut and the stud.

[0013] By adopting the above technical solution, the nuts and studs are used to fix the clamping parts, ensuring the accuracy and consistency of the installation position, while reducing the risk of displacement caused by operational errors during installation. In addition, the studs are integrally formed on the fuel tank cover, ensuring the sealing of the fuel tank cover.

[0014] Optionally, the high-pressure porcelain insulator is threaded onto the oil tank cover, and both the clamping component and the high-pressure porcelain insulator are provided with a locking structure, which is used to fix the high-pressure porcelain insulator and the clamping component relative to each other.

[0015] By adopting the above technical solution, if the axial dimension of the part of the high-pressure porcelain insulator that is pressed by the clamping part is small, resulting in the clamping part being unable to press the high-pressure porcelain insulator tightly, then double fixation can be achieved through the locking structure between the high-pressure porcelain insulator and the clamping part, as well as the threaded connection between the high-pressure porcelain insulator itself and the oil tank cap, to prevent the high-pressure porcelain insulator and the clamping part from rotating relative to each other. This is especially suitable for high-frequency vibration working environments and significantly improves the reliability of fixation.

[0016] Optionally, the locking structure includes multiple sets of locking blocks and locking elastic elements. The locking structure also includes a locking groove formed on the side wall of the clamping member facing the high-pressure porcelain insulator. Each set of locking blocks and locking elastic elements is arranged along the outer peripheral surface of the high-pressure porcelain insulator. Multiple telescopic grooves corresponding to different locking blocks are formed on the outer peripheral surface of the high-pressure porcelain insulator. The locking blocks are slidably disposed in the telescopic grooves. The locking elastic elements are disposed between the locking blocks and the bottom wall of the telescopic grooves. The locking elastic elements are used to drive the locking blocks to pop out of the telescopic grooves and insert into the locking grooves.

[0017] By adopting the above technical solution, the design of the elastic locking block and the locking groove can automatically lock and buffer vibration and impact during the installation of high-pressure porcelain insulators. The locking is convenient and has a good anti-rotation effect on the high-pressure porcelain insulators. At the same time, it allows a certain degree of deformation compensation to adapt to thermal expansion and contraction under different working conditions.

[0018] Optionally, an inclined guide slope is formed on the side wall of the end of the locking block away from the bottom wall of the expansion groove. When the high-pressure porcelain bottle rotates and moves away from the oil tank cover, the groove wall of the locking groove slides against the guide slope, pressing the locking block back into the expansion groove.

[0019] By adopting the above technical solution, the guide slope of the locking block slides and engages with the locking groove wall, allowing the high-pressure porcelain insulator to rotate smoothly during locking. It automatically locks when the locking block is engaged in the locking groove, without the need for additional tools, which greatly improves the installation efficiency. After locking, the high-pressure porcelain insulator comes into contact with the pressing part and cannot continue to rotate in reverse. Because the locking block comes into contact with the locking groove wall, the high-pressure porcelain insulator cannot rotate in the correct direction, which has a good anti-rotation effect on the high-pressure porcelain insulator.

[0020] Optionally, it also includes bolts, with mounting holes through which bolts pass, and threaded holes on the side wall of the fuel tank cover near the clamping member, and the clamping member is fixed to the fuel tank cover by bolts and threaded holes.

[0021] By adopting the above technical solution, if the clamping component is fixed by connecting the stud and nut integrally formed on the fuel tank cover, the clamping component can only be removed from the stud in the vertical direction. It is necessary to use a tool to press the locking block back into the telescopic groove before removing the clamping component from the stud. The insertion of the locking block into the locking groove will affect the ease of removal of the clamping component. This application fixes the clamping component by the cooperation of bolts and threaded holes, forming a multi-level fastening mechanism to ensure that the high-pressure porcelain insulator is stable and does not loosen in the long term. When the high-pressure porcelain insulator needs to be maintained or replaced, it is only necessary to unscrew the bolts and then move the clamping component horizontally away from the high-pressure porcelain insulator. The locking block will disengage from the locking groove, and then the high-pressure porcelain insulator can be disassembled normally. Disassembly is convenient and avoids the locking of the locking block and the locking groove from affecting the ease of disassembly of the high-pressure porcelain insulator.

[0022] Optionally, the high-pressure porcelain insulator is provided with threads, and the oil tank cover is provided with a fixing hole for threaded connection of the high-pressure porcelain insulator. The threads on the bolt and the high-pressure porcelain insulator are both tapered threads, and the tapered threads on the bolt and the high-pressure porcelain insulator are used to seal the threaded hole and the fixing hole on the oil tank cover, respectively.

[0023] By adopting the above technical solution, the tapered thread design generates radial clamping force during the tightening process, which not only enhances the connection strength, but also achieves a self-sealing effect at the thread to prevent transformer oil leakage.

[0024] An assembly method for assembling and installing a stable oil-immersed three-dimensional wound core transformer, wherein the high-voltage porcelain insulator includes a locking part, and the opposite side walls of the locking part are respectively used to abut against the side walls of the clamping part and the tank cover, comprising the following steps:

[0025] Initial fixation of the high-pressure porcelain insulator: Thread the high-pressure porcelain insulator onto the fuel tank cap;

[0026] Initially secure the clamping components: Connect the clamping components to the fuel tank cover using bolts;

[0027] Locking the high-pressure porcelain insulator: If the axial dimension of the locking part is greater than or equal to the distance between the clamping part and the end of the clamping member near the fuel tank cover, adjust the depth of the bolt screwed into the threaded hole of the fuel tank cover until the bolt head abuts against the side wall of the locking part; if the axial dimension of the locking part is less than the distance between the clamping part and the end of the clamping member near the fuel tank cover, reverse the high-pressure porcelain insulator so that the high-pressure porcelain insulator moves away from the fuel tank cover until the bolt head abuts against the side wall of the locking part, at which point the locking block is inserted into the locking groove.

[0028] By adopting the above technical solution, the assembly method can flexibly adjust the bolt screwing depth or the position of the high-pressure porcelain insulator according to the size of the locking part, ensuring that the locking block is accurately inserted into the locking groove, adapting to different specifications of parts, and improving assembly compatibility and operational error tolerance.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. The design of the detachable high-pressure porcelain insulator and the clamping part facilitates the maintenance or replacement of the high-pressure porcelain insulator, and enhances the fixing stability through the clamping part, reducing the risk of loosening caused by vibration or external force.

[0031] 2. Double fixation is achieved through the locking structure between the high-pressure porcelain insulator and the clamping component, as well as the threaded connection between the high-pressure porcelain insulator and the oil tank cap, to prevent relative rotation between the high-pressure porcelain insulator and the clamping component;

[0032] 3. Adjust the bolt screwing depth or high-pressure porcelain insulator position flexibly according to the size of the locking part to ensure that the locking block is accurately inserted into the locking groove, adapt to different specifications of parts, and improve assembly compatibility and operational error tolerance. Attached Figure Description

[0033] Figure 1 This is a partial exploded view of Embodiment 1 of this application.

[0034] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0035] Figure 3 This is a partial exploded view of Embodiment 2 of this application.

[0036] Figure 4 yes Figure 3 Enlarged view of section B in the middle.

[0037] Figure 5 This is a top sectional view of the locking structure in Embodiment 2 of this application.

[0038] Explanation of reference numerals in the attached drawings: 1. Fuel tank cover; 11. Stud; 12. Threaded hole; 13. Fixing hole; 2. High-pressure porcelain insulator; 21. Expansion groove; 22. Locking part; 3. Clamping part; 31. Clamping part; 311. Pressure bearing end; 312. Clamping end; 32. Mounting hole; 33. Fixing part; 4. Nut; 5. Locking structure; 51. Locking block; 511. Guide slope; 52. Locking elastic element; 53. Locking groove; 6. Bolt. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0040] Example 1:

[0041] Embodiment 1 of this application discloses a stable oil-immersed three-dimensional wound core transformer. (Refer to...) Figure 1 The oil-immersed three-dimensional wound core transformer includes an oil tank cover 1 and a high-voltage porcelain insulator 2 and a clamping member 3 detachably connected to the oil tank cover 1. There are three clamping members 3, which are evenly distributed around the axis of the high-voltage porcelain insulator 2. The clamping members 3 are used to press the high-voltage porcelain insulator 2 onto the oil tank cover 1.

[0042] Reference Figure 2 The high-pressure porcelain insulator 2 includes a locking part 22. The clamping member 3 includes a clamping part 31, which abuts against the locking part 22 to clamp the high-pressure porcelain insulator 2 onto the fuel tank cover 1. The clamping member 3 is threaded onto the fuel tank cover 1. Three studs 11, corresponding one-to-one with the clamping members 3, are integrally formed on the top wall of the fuel tank cover 1. Mounting holes 32 are provided through the clamping members 3 for the studs 11 to pass through. Nuts 4 are threaded onto the studs 11, and the nuts 4 are used to clamp the clamping part 31 of the clamping member 3 onto the locking part 22 of the high-pressure porcelain insulator 2.

[0043] Reference Figure 2 The clamping member 3 also includes a fixing part 33, which is used to bear the pressure from the nut 4 and transmit the pressure to the clamping part 31. The clamping part 31 includes a bearing end 311 and a clamping end 312. The clamping end 312 is located on the side of the bearing end 311 near the locking part 22, and the bearing end 311 is located directly below the fixing part 33. The bearing end 311 is used to bear the pressure from the fixing part 33, and the clamping end 312 is used to press against the locking part 22, thus minimizing the risk of breakage of the clamping part 31.

[0044] The implementation principle of a stable oil-immersed three-dimensional wound core transformer according to Embodiment 1 of this application is as follows: First, place the high-voltage porcelain insulator 2 on the top wall of the tank cover 1, then put the clamping part 3 on the stud 11, and then screw the nut 4 on the stud 11. Adjust the depth of screwing in the nut 4 until the clamping end 312 and the locking part 22 are tightly pressed against the top of the tank cover 1.

[0045] Example 2:

[0046] Reference Figure 3 Unlike Embodiment 1, in this embodiment, a fixing hole 13 is provided on the top wall of the fuel tank cover 1, and a thread is formed on the inner wall of the fixing hole 13 (not shown in the figure). A tapered thread (NPT thread) is formed on the high-pressure porcelain insulator 2, that is, the radial dimension of the thread segment decreases along the direction of penetrating the fixing hole 13, and the high-pressure porcelain insulator 2 is threadedly connected in the fixing hole 13.

[0047] Reference Figure 4 The top wall of the fuel tank cover 1 is also provided with a threaded hole 12. The inner wall of the threaded hole 12 is formed with threads (not shown in the figure). The threaded hole 12 is connected to a bolt 6. The bolt 6 has a tapered thread (NPT thread) on its screw, that is, the radial dimension of the thread section decreases along the direction of the threaded hole 12. The mounting hole 32 on the clamping member 3 is for the bolt 6 to pass through. The clamping member 3 is pressed onto the high-pressure porcelain bottle 2 by the bolt 6.

[0048] Reference Figure 4 and Figure 5 It also includes a locking structure 5, which is used to prevent the high-pressure porcelain insulator 2 from rotating and to fix the clamping member 3. The locking structure 5 includes multiple sets of locking blocks 51 and locking elastic members 52, which are evenly distributed along the outer peripheral surface of the locking part 22. Multiple telescopic grooves 21 corresponding to the locking blocks 51 are opened on the outer peripheral surface of the locking part 22, and the telescopic grooves 21 extend radially along the locking part 22. The locking blocks 51 are slidably installed in the telescopic grooves 21, and the locking elastic members 52 are pressed between the locking blocks 51 and the bottom wall of the telescopic grooves 21. The locking elastic members 52 are compression springs, which are used to drive the locking blocks 51 to pop out of the telescopic grooves 21.

[0049] Reference Figure 4 and Figure 5 A guide slope 511 is formed on the side wall of the end of the locking block 51 away from the bottom wall of the telescopic groove 21 by a chamfering process. The high-pressure porcelain insulator 2 is set to rotate clockwise as the forward rotation, during which the high-pressure porcelain insulator 2 is screwed into the fixing hole 13. The guide slope 511 is inclined in the direction of counterclockwise rotation, that is, when the high-pressure porcelain insulator 2 rotates in the reverse direction, the outer peripheral surface of the clamping member 3 slides against the guide slope 511, pressing the locking block 51 back into the telescopic groove 21.

[0050] Reference Figure 4 and Figure 5The locking structure 5 also includes a locking groove 53, which is formed on the outer peripheral surface of the clamping member 3 near the locking part 22. The locking groove 53 extends radially along the locking part 22 and is used for the insertion of the locking block 51. When the high-pressure porcelain insulator 2 rotates in the reverse direction, the groove sidewall of the locking groove 53 slides against the guide slope 511, pressing the locking block 51 back into the telescopic groove 21 until the next locking block 51 aligns with the locking groove 53. The locking elastic member 52 then drives the locking block 51 to pop out of the telescopic groove 21 and insert into the locking groove 53.

[0051] Embodiment 2 of this application also discloses an assembly method for assembling the above-mentioned stable oil-immersed three-dimensional wound core transformer, including the following steps:

[0052] Preliminary fixation of high pressure porcelain insulator 2: The high pressure porcelain insulator 2 is threadedly connected to the oil tank cover 1 through the thread on the high pressure porcelain insulator 2 and the fixing hole 13 on the oil tank cover 1, so that the bottom wall of the locking part 22 is pressed against the top wall of the oil tank cover 1.

[0053] Preliminary fixation of clamping component 3: Clamping component 3 is threaded onto oil tank cover 1 by bolt 6 and threaded hole 12 on oil tank cover 1;

[0054] Locking the high-pressure porcelain insulator 2: If the axial dimension of the locking part 22 is greater than or equal to the distance between the clamping part 31 and the end of the clamping member 3 near the oil tank cover 1, adjust the depth of the bolt 6 into the threaded hole 12 of the oil tank cover 1 until the bolt head of the bolt 6 abuts against the side wall of the locking part 22, thus completing the locking of the high-pressure porcelain insulator 2; if the axial dimension of the locking part 22 is less than the distance between the clamping part 31 and the end of the clamping member 3 near the oil tank cover 1, that is, when the end of the clamping member 3 abuts against the top wall of the oil tank cover 1, the clamping part 31 still cannot abut against the locking part 22, then reverse the high-pressure porcelain insulator 2 so that the high-pressure porcelain insulator 2 moves away from the oil tank cover 1 until the bolt head of the bolt 6 abuts against the side wall of the locking part 22, at which point the locking block 51 is inserted into the locking groove 53.

[0055] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A stable, oil-immersed, three-dimensional wound core transformer, characterized in that: The system includes a fuel tank cap (1) and a high-pressure porcelain insulator (2) and a clamping component (3) detachably connected to the fuel tank cap (1). The clamping component (3) includes a clamping part (31) that abuts against the high-pressure porcelain insulator (2). The high-pressure porcelain insulator (2) is threaded onto the fuel tank cap (1). Both the clamping component (3) and the high-pressure porcelain insulator (2) are provided with locking structures (5). The locking structures (5) are used to fix the high-pressure porcelain insulator (2) and the clamping component (3) relative to each other. The locking structures (5) include multiple sets of locking blocks (5). 1) With locking elastic element (52), the locking structure (5) also includes a locking groove (53) opened on the side wall of the clamping element (3) facing the high-pressure porcelain bottle (2). Each set of locking blocks (51) and locking elastic element (52) are arranged along the outer peripheral surface of the high-pressure porcelain bottle (2). Multiple telescopic grooves (21) corresponding to different locking blocks (51) are opened on the outer peripheral surface of the high-pressure porcelain bottle (2). The locking blocks (51) are slidably disposed in the telescopic grooves (21). The locking elastic element (52) is disposed between the locking blocks (51) and the telescopic grooves (21). Between the bottom walls of the groove, the locking elastic element (52) is used to drive the locking block (51) to pop out of the telescopic groove (21) and insert into the locking groove (53); the side wall of the end of the locking block (51) away from the bottom wall of the groove is formed with an inclined guide slope (511). When the high-pressure porcelain bottle (2) rotates and moves away from the oil tank cover (1), the groove wall of the locking groove (53) slides against the guide slope (511) and presses the locking block (51) back into the telescopic groove (21); the high-pressure porcelain bottle (2) Includes a locking part (22), the opposite side walls of the locking part (22) are respectively used to abut against the side walls of the pressing part (31) and the oil tank cover (1). If the axial dimension of the locking part (22) is less than the distance between the pressing part (31) and the end of the pressing part (3) near the oil tank cover (1), the high pressure porcelain bottle (2) is reversed, so that the high pressure porcelain bottle (2) moves away from the oil tank cover (1) until the bolt head of the bolt (6) abuts against the side wall of the locking part (22). At this time, the locking block (51) is inserted into the locking groove (53).

2. The oil-immersed three-dimensional wound core transformer with stable installation according to claim 1, characterized in that: The clamping element (3) is threaded onto the oil tank cover (1).

3. The oil-immersed three-dimensional wound core transformer with stable installation according to claim 2, characterized in that: The clamping part (31) includes a pressure-bearing end (311) and a clamping end (312). The pressure-bearing end (311) is used to withstand the pressure from the bolt head or nut, and the clamping end (312) is used to contact the high-pressure porcelain insulator (2).

4. The stable oil-immersed three-dimensional wound core transformer according to claim 2, characterized in that: It also includes a nut (4), and a stud (11) is integrally formed on the side wall of the oil tank cover (1) near the clamping member (3). The clamping member (3) has a through hole (32) for the stud (11) to pass through. The clamping member (3) is fixed to the oil tank cover (1) by the nut (4) and the stud (11).

5. The oil-immersed three-dimensional wound core transformer with stable installation according to claim 1, characterized in that: It also includes bolts (6), and the clamping member (3) has a through mounting hole (32) for the bolts (6) to pass through. The oil tank cover (1) has a threaded hole (12) on the side wall near the clamping member (3). The clamping member (3) is fixed to the oil tank cover (1) by bolts (6) and threaded hole (12).

6. The oil-immersed three-dimensional wound core transformer with stable installation according to claim 5, characterized in that: The high-pressure porcelain insulator (2) is provided with threads, and the oil tank cover (1) is provided with a fixing hole (13) for threaded connection of the high-pressure porcelain insulator (2). The threads on the bolt (6) and the high-pressure porcelain insulator (2) are both tapered threads. The tapered threads on the bolt (6) and the high-pressure porcelain insulator (2) are used to seal the threaded hole (12) and the fixing hole (13) on the oil tank cover (1) respectively.

7. An assembly method, characterized in that: The method for assembling the stable oil-immersed three-dimensional wound core transformer as described in claim 6 includes the following steps: Preliminary fixation of the high-pressure porcelain insulator (2): Thread the high-pressure porcelain insulator (2) onto the oil tank cap (1); Preliminary fixing of clamping component (3): The clamping component (3) is threaded onto the oil tank cover (1) by bolts (6); Locking the high-pressure porcelain bottle (2): If the axial dimension of the locking part (22) is greater than or equal to the distance between the end of the clamping part (31) and the end of the clamping member (3) near the oil tank cover (1), adjust the depth of the bolt (6) into the threaded hole (12) of the oil tank cover (1) until the bolt head of the bolt (6) abuts against the side wall of the locking part (22); if the axial dimension of the locking part (22) is less than the distance between the end of the clamping part (31) and the end of the clamping member (3) near the oil tank cover (1), reverse the high-pressure porcelain bottle (2) so that the high-pressure porcelain bottle (2) moves away from the oil tank cover (1) until the bolt head of the bolt (6) abuts against the side wall of the locking part (22), at which time the locking block (51) is inserted into the locking groove (53).

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