Anti-loose transformer bushing

Abstract

The utility model discloses a kind of anti-loose transformer bushings, belong to transformer fittings field.The anti-loose transformer bushing of the utility model, it includes conducting rod, insulating sleeve and locking nut, locking nut is installed in the lower part of conducting rod and the bottom of insulating sleeve is locked and fixed, the lower part of conducting rod has flat section, anti-loose strip is welded and fixed on locking nut, and anti-loose strip and flat section abut each other.Anti-loose strip is a character, and welded on the bottom surface of locking nut, the side long side of anti-loose strip and the corresponding side plane of flat section contact each other.In the utility model, after locking nut locking and fixing, anti-loose strip welded on locking nut and flat section of conducting rod abut each other, so that relative rotation between locking nut and conducting rod does not occur, so that locking nut loosening is effectively prevented, the safe and stable operation of transformer bushing is guaranteed;And, anti-loose effect is realized by the cooperation of anti-loose strip and conducting rod, simple structure, easy to make, and low manufacturing cost.

Description

Technical Field

[0001] This utility model relates to a transformer accessory, and more specifically, to an anti-loosening transformer bushing. Background Technology

[0002] Transformer bushings are one of the key components affecting the power transmission and transformation performance of transformers. Their main function is to lead the high and low voltage leads inside the transformer to the outside of the transformer tank, and to insulate the leads to ground and fix the leads.

[0003] Low-voltage side bushings of transformers are mostly dry-type bushings with composite insulation, which are fixed to the outside of the transformer tank using pressure plates. Chinese Patent Publication No. CN218513296U discloses "A Transformer Dry-Type Bushing with Good Heat Dissipation and No Cracks or Leaks," which includes a conductive rod, a first sealing gasket, a composite insulating sleeve, and fasteners. The composite insulating sleeve is movably fitted onto the outside of the conductive rod. The first sealing gasket is located between the upper part of the composite insulating sleeve and the conductive rod. The lower part of the composite insulating sleeve is fixed to the conductive rod by fasteners. The composite insulating sleeve has an internal cavity, forming an oil passage between the internal cavity and the conductive rod. At least one oil groove is provided along the length of the conductive rod, forming an oil inlet and outlet connected to the tail of the oil passage. This patent application improves the heat dissipation performance of the bushing by setting an oil passage between the composite insulating sleeve and the conductive rod. It is clear that the assembly of the aforementioned transformer bushing mainly relies on fasteners (lock nuts) to axially lock and fix the conductive rod, the first sealing gasket, and the composite insulating sleeve. The preload of the lock nut is used to press the sealing gasket to achieve the bushing seal. However, during long-term operation of the transformer, the lock nut is prone to loosening due to thermal expansion and contraction, and rotation of the conductive rod. Once the lock nut loosens, it can not only reduce the sealing performance of the sealing gasket or even cause it to fail, but it can also cause the conductive rod to loosen, adding uncertain safety hazards to the normal operation of the transformer. Moreover, the lock nut of the transformer bushing is located inside the tank, making it difficult to quickly retighten a loose lock nut. Summary of the Invention

[0004] 1. Technical problem to be solved by the utility model

[0005] The purpose of this utility model is to overcome the shortcomings of existing transformer bushing locking nuts that are prone to loosening, and to provide a transformer bushing with anti-loosening technology. Using the technical solution of this utility model, after the locking nut is locked in place, an anti-loosening strip welded to the locking nut abuts against the flat section of the conductive rod, preventing relative rotation between the locking nut and the conductive rod, thus effectively preventing the locking nut from loosening and ensuring the safe and stable operation of the transformer bushing. Furthermore, the anti-loosening design is achieved through the cooperation of the anti-loosening strip and the conductive rod, resulting in a simple structure, convenient manufacturing, and low manufacturing cost.

[0006] 2. Technical Solution

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0008] This utility model discloses an anti-loosening transformer bushing, comprising a conductive rod, an insulating sleeve, and a locking nut. The insulating sleeve is fitted onto the outside of the conductive rod, and a sealing gasket is provided between the upper part of the insulating sleeve and the conductive rod to seal the mating gap between the insulating sleeve and the upper part of the conductive rod. The locking nut is installed on the lower part of the conductive rod and locks and fixes the bottom of the insulating sleeve. It also includes an anti-loosening strip, the lower part of the conductive rod having a flat section, and the anti-loosening strip is welded and fixed to the locking nut, with the anti-loosening strip abutting against the flat section.

[0009] Furthermore, the anti-loosening strip is in the shape of a straight line and is welded to the bottom surface of the locking nut, with one long side of the anti-loosening strip contacting the corresponding side plane of the flat section.

[0010] Furthermore, the flat section extends from the bottom of the conductive rod into the interior of the insulating sleeve, forming an oil channel with an open lower end with the inner cavity of the insulating sleeve, and the width h of the anti-loosening strip is less than the chord height H from the plane of the flat section to the inner cavity of the insulating sleeve.

[0011] Furthermore, the upper part of the conductive rod is provided with a limiting platform, and the sealing gasket is located between the upper end face of the insulating sleeve and the lower end face of the limiting platform.

[0012] Furthermore, a wiring dock is also provided on the top of the limiting platform.

[0013] Furthermore, the anti-loosening transformer bushing is installed on the outside of the transformer housing via a pressure plate assembly. The insulating sleeve has a flange in the middle. The pressure plate assembly includes a pressure plate and a pressure plate nut. A stud is provided at the mounting position of the housing. The pressure plate has a mounting hole through which the corresponding stud can pass. The pressure plate presses on the flange and is fixed by the pressure plate nut screwed onto the stud. A sealing ring is also provided between the flange and the outer wall of the housing.

[0014] 3. Beneficial effects

[0015] Compared with existing known technologies, the technical solution provided by this utility model has the following beneficial effects:

[0016] (1) The present invention provides an anti-loosening transformer bushing, which includes a conductive rod, an insulating sleeve, and a locking nut. The locking nut is installed at the lower part of the conductive rod and locks and fixes the bottom of the insulating sleeve. The lower part of the conductive rod has a flat section. An anti-loosening strip is welded and fixed to the locking nut, and the anti-loosening strip abuts against the flat section. After the locking nut is locked and fixed, the anti-loosening strip welded to the locking nut abuts against the flat section of the conductive rod, so that there is no relative rotation between the locking nut and the conductive rod, thereby effectively preventing the locking nut from loosening and ensuring the safe and stable operation of the transformer bushing. Furthermore, the anti-loosening effect is achieved by the cooperation of the anti-loosening strip and the conductive rod. The structure is simple, easy to manufacture, and has low manufacturing cost.

[0017] (2) The anti-loosening transformer bushing of this utility model has an anti-loosening strip in the shape of a straight line, which is welded to the bottom surface of the locking nut. One long side of the anti-loosening strip is in contact with the corresponding side plane of the flat section. The anti-loosening strip has a simple structure, is easy to use, and has a good anti-loosening effect.

[0018] (3) The present invention provides a type of anti-loosening transformer bushing, wherein the flat section extends from the bottom of the conductive rod to the inside of the insulating sleeve, forming an oil channel with an open lower end with the inner cavity of the insulating sleeve. The width h of the anti-loosening strip is less than the chord height H from the plane of the flat section to the inner cavity of the insulating sleeve. This can form an oil channel in the bushing, improve the heat dissipation efficiency of the bushing, and the anti-loosening strip is narrower, which can ensure that the oil channel is unobstructed.

[0019] (4) The present invention provides a type of anti-loosening transformer bushing, wherein the upper part of the conductive rod is provided with a limiting platform and the sealing gasket is located between the upper end face of the insulating sleeve and the lower end face of the limiting platform, which ensures the sealing of the oil passage and can prevent the bushing from leaking oil.

[0020] (5) The present invention provides a type of anti-loosening transformer bushing, which is installed on the outside of the transformer housing by a pressure plate assembly. The pressure plate assembly includes a pressure plate and a pressure plate nut. A stud is provided at the installation position of the housing. The pressure plate has an installation hole that can pass through the corresponding stud. The pressure plate presses on the flange and is fixed by the pressure plate nut screwed on the stud. A sealing ring is also provided between the flange and the outer wall of the housing. The pressure plate assembly has a simple structure, is easy to install, and provides a firm and reliable installation of the transformer bushing. It is also easy to disassemble. Attached Figure Description

[0021] Figure 1 This is a front view of an anti-loosening transformer bushing according to the present invention;

[0022] Figure 2 This is a side view of an anti-loosening transformer bushing according to the present invention;

[0023] Figure 3 for Figure 2 A bottom view of the anti-loosening transformer bushing.

[0024] Explanation of the labels in the diagram:

[0025] 1. Conductive rod; 1-1. Limiting platform; 1-2. Flat section; 1-3. Terminal block; 2. Insulating sleeve; 2-1. Flange; 3. Sealing gasket; 4. Locking nut; 5. Anti-loosening strip; 6. Box body; 6-1. Stud; 7. Pressure plate assembly; 7-1. Pressure plate; 7-2. Pressure plate nut. Detailed Implementation

[0026] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0027] [Example]

[0028] Combination Figures 1 to 3 As shown, an anti-loosening transformer bushing of this embodiment includes a conductive rod 1, an insulating sleeve 2, and a locking nut 4. The insulating sleeve 2 is sleeved on the outside of the conductive rod 1. A sealing gasket 3 is provided between the upper part of the insulating sleeve 2 and the conductive rod 1 to seal the mating gap between the insulating sleeve 2 and the upper part of the conductive rod 1. The locking nut 4 is installed on the lower part of the conductive rod 1 and locks and fixes the bottom of the insulating sleeve 2, thereby realizing the assembly of the insulating sleeve 2 and the conductive rod 1. The anti-loosening transformer bushing of this embodiment also includes an anti-loosening strip 5. The lower part of the conductive rod 1 has a flat section 1-2. The anti-loosening strip 5 is welded and fixed to the locking nut 4, and the anti-loosening strip 5 abuts against the flat section 1-2. Since the anti-loosening strip 5 is welded and fixed to the locking nut 4 as a whole, the anti-loosening strip 5 moves together with the locking nut 4. The anti-loosening strip 5 abuts against the flat section 1-2 of the conductive rod 1, preventing the anti-loosening strip 5 from rotating relative to the conductive rod 1. This also prevents the locking nut 4 from rotating relative to the conductive rod 1, thus preventing loosening and ensuring the safe and stable operation of the transformer bushing. Furthermore, the anti-loosening function achieved by using the cooperation of the anti-loosening strip 5 and the conductive rod 1 is simple in structure, easy to manufacture, and has low manufacturing cost.

[0029] Reference Figures 1 to 3 As shown, specifically in this embodiment, the aforementioned anti-loosening strip 5 is preferably in the shape of a straight line and is welded to the bottom surface of the locking nut 4. One long side of the anti-loosening strip 5 contacts the corresponding side plane of the flat section 1-2. The anti-loosening strip 5 has a simple structure, is easy to use, and has a good anti-loosening effect. Both the locking nut 4 and the anti-loosening strip 5 are preferably made of stainless steel, and they can be welded together using a laser welding machine.

[0030] In this embodiment, the anti-loosening transformer bushing has a flat section 1-2 that extends from the bottom of the conductive rod 1 into the interior of the insulating sleeve 2, forming an open oil passage at the lower end with the inner cavity of the insulating sleeve 2. After the transformer bushing is installed on the transformer tank 6, the oil passage connects to the transformer oil inside the tank 6 through the open end at the bottom, allowing the transformer oil to enter the oil passage and thus dissipate heat from the bushing, improving its heat dissipation performance. Because the bushing has better heat dissipation performance, the insulating sleeve 2 can be made not only of porcelain but also of composite insulating sleeves, etc. The material of the composite insulating sleeve can be epoxy resin, DMC composite material, SMC composite material, etc. Figure 3 As shown, in this embodiment, the width h of the anti-loosening strip 5 is less than the chord height H from the plane of the flat section 1-2 to the inner cavity of the insulating sleeve 2. This can prevent the anti-loosening strip 5 from completely blocking the oil passage on one side and ensure that the oil passage is unobstructed.

[0031] like Figure 1 and Figure 2 As shown, in this embodiment, the upper part of the conductive rod 1 is provided with a limiting platform 1-1, which can be circular. The sealing gasket 3 is located between the upper end face of the insulating sleeve 2 and the lower end face of the limiting platform 1-1, ensuring the sealing of the oil passage and preventing oil leakage from the bushing. The top of the limiting platform 1-1 is also provided with a terminal block 1-3 for external connection of the transformer leads. The lower end of the conductive rod 1 extends out of the lower end of the insulating sleeve 2, serving as a connection seat for the internal leads of the transformer.

[0032] catch Figure 1 and Figure 2 As shown in the figure, an anti-loosening transformer bushing of this embodiment is installed on the outside of the transformer housing 6 via a pressure plate assembly 7. Specifically, the insulating sleeve 2 has a flange 2-1 in the middle. The pressure plate assembly 7 includes a pressure plate 7-1 and a pressure plate nut 7-2. A stud 6-1 is provided at the mounting position of the housing 6. The pressure plate 7-1 has a mounting hole that can pass through the corresponding stud 6-1. The pressure plate 7-1 presses on the flange 2-1 and is fixed by the pressure plate nut 7-2 screwed onto the stud 6-1. A sealing ring is also provided between the flange 2-1 and the outer wall of the housing 6. The pressure plate assembly 7 has a simple structure, is easy to install, provides a firm and reliable installation of the transformer bushing, and is easy to disassemble. For ease of installation, the pressure plate 7-1 can adopt a two-half structure, with the two pressure plate parts clamping together from the outside of the insulating sleeve 2, further facilitating the installation operation of the transformer bushing on the transformer.

[0033] The anti-loosening transformer bushing of this embodiment has other specific structures similar to the prior art. For details, please refer to Chinese Patent Publication No. CN218513296U, which discloses "a transformer dry bushing with good heat dissipation and no cracking or leakage", etc., which will not be elaborated here.

[0034] This utility model provides an anti-loosening transformer bushing. Compared with the prior art, after the locking nut is tightened, the anti-loosening strip welded to the locking nut abuts against the flat section of the conductive rod, preventing relative rotation between the locking nut and the conductive rod. This effectively prevents the locking nut from loosening and ensures the safe and stable operation of the transformer bushing. Furthermore, the anti-loosening design is achieved through the cooperation of the anti-loosening strip and the conductive rod, resulting in a simple structure, convenient manufacturing, and low manufacturing cost.

[0035] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A transformer bushing with anti-loosening features, comprising a conductive rod (1), an insulating sleeve (2), and a locking nut (4), wherein the insulating sleeve (2) is fitted over the outside of the conductive rod (1), and a sealing gasket (3) is provided between the upper part of the insulating sleeve (2) and the conductive rod (1) for sealing the mating gap between the upper part of the insulating sleeve (2) and the conductive rod (1), and the locking nut (4) is installed on the lower part of the conductive rod (1) and locks and fixes the bottom of the insulating sleeve (2), characterized in that: It also includes an anti-loosening strip (5), the lower part of the conductive rod (1) has a flat section (1-2), the anti-loosening strip (5) is welded and fixed on the locking nut (4), and the anti-loosening strip (5) abuts against the flat section (1-2).

2. The anti-loosening transformer bushing according to claim 1, characterized in that: The anti-loosening strip (5) is in the shape of a straight line and is welded to the bottom surface of the locking nut (4). One long side of the anti-loosening strip (5) is in contact with the corresponding side plane of the flat section (1-2).

3. The anti-loosening transformer bushing according to claim 2, characterized in that: The flat section (1-2) extends from the bottom of the conductive rod (1) into the interior of the insulating sleeve (2), forming an oil channel with an open lower end with the inner cavity of the insulating sleeve (2). The width h of the anti-loosening strip (5) is less than the chord height H from the plane of the flat section (1-2) to the inner cavity of the insulating sleeve (2).

4. The anti-loosening transformer bushing according to claim 1, 2, or 3, characterized in that: The upper part of the conductive rod (1) is provided with a limiting platform (1-1), and the sealing gasket (3) is located between the upper end face of the insulating sleeve (2) and the lower end face of the limiting platform (1-1).

5. The anti-loosening transformer bushing according to claim 4, characterized in that: The top of the limiting platform (1-1) is also provided with a wiring terminal (1-3).

6. The anti-loosening transformer bushing according to claim 4, characterized in that: The anti-loosening transformer bushing is installed on the outside of the transformer housing (6) via a pressure plate assembly (7). The insulating sleeve (2) has a flange (2-1) in the middle. The pressure plate assembly (7) includes a pressure plate (7-1) and a pressure plate nut (7-2). A stud (6-1) is provided at the mounting position of the housing (6). The pressure plate (7-1) has a mounting hole that can pass through the corresponding stud (6-1). The pressure plate (7-1) presses on the flange (2-1) and is fixed by the pressure plate nut (7-2) screwed on the stud (6-1). A sealing ring is also provided between the flange (2-1) and the outer wall of the housing (6).

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