Transformer bushing transition connection assembly
By designing the transformer casing transition connection components, the problem of inconsistent casing flange interfaces of different brands is solved, and rapid installation and replacement is achieved, ensuring the continuity of transformer production and environmental cleanliness.
Patent Information
- Application Number
- CN202422133823.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-02
AI Technical Summary
The flange interface of transformer casing of different brands and models is inconsistent, which causes the casing to be unable to be installed normally. Adjusting the cutting fuel tank or lifting seat in the transformer production workshop will pollute the environment and delay production tasks.
A transformer sleeve transition connection assembly is designed, including transition flange, transition flange fixing bolts, sleeve flange fixing bolts, disc springs and flat washers. Through the circularly arranged fixed screw holes and sealing groove structures, sleeves of different interface sizes can be quickly installed and replaced. The transition flange fixing bolts are reinforced by disc springs and flat washers to prevent vibration and loosening.
It realizes rapid installation and replacement of casings of different interface sizes, avoids environmental pollution and delays in production tasks, and ensures normal operation and rapid delivery of transformers.
Smart Images
Figure CN223167315U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a transition connection assembly for a transformer bushing, belonging to the technical field of transformer equipment. Background Art
[0002] Generally, a transformer bushing is fixedly installed on a transformer tank cover or a riser by bolts. The distance between the mounting holes of the bushing flange, the number of holes, etc. should be coordinated with the dimensions of the mounting holes reserved on the tank cover or the riser. For bushings of different brands and models, the interface dimensions of the bushing flanges are different. When designing a transformer, the installation interfaces of the tank cover or the riser need to be designed according to bushings of different brands and models. Generally, the two can fit tightly. However, sometimes due to some accidental factors, such as design errors in the transformer or manufacturing errors of the bushing manufacturer, the problem of inconsistent interfaces between the bushing flange and the tank cover or the riser often occurs, resulting in the bushing being unable to be installed in place normally. At this time, it is necessary to contact the bushing manufacturer to replace the appropriate bushing, or cut the oil tank or the riser for modification. However, on the one hand, the bushings of the bushing manufacturer are usually series products, and there may not be a bushing with exactly the right interface dimensions and performance parameters. If a special one is required, the time cycle is relatively long, which will delay the production and delivery tasks of the transformer. On the other hand, in order to control the dust fall and the clean environment of foreign objects, especially metal foreign objects, in the transformer production workshop, cutting the oil tank or the riser will cause pollution, and it is generally not allowed to be carried out in the production workshop. If the oil tank or the riser is transported out and then returned to the production workshop for treatment, it will also delay the production and delivery tasks of the transformer.
[0003] In addition, there are many old transformers on the power grid that need on-site renovation or emergency power outage to replace bushings. Because the interface dimensions of bushings from different manufacturers are different, or the bushings of the same manufacturer are updated, and even some bushing manufacturers no longer exist, the above-mentioned technical problems will also be encountered at this time. If not handled in time, it will delay the restoration of the transformer to operation, resulting in relatively large losses and social impacts. Summary of the Invention
[0004] In view of the above technical problems, the utility model provides a transition connection assembly for a transformer bushing, and the technical solution adopted is as follows:
[0005] Transformer bushing transition connection assembly, including a transition flange, transition flange fixing bolts, bushing flange fixing bolts, disc springs and flat washers; the transition flange is a circular steel component, and several transition flange fixing screw holes are provided on the upper surface of the transition flange. The transition flange fixing screw holes are designed with cylindrical counterbores, and the positions of the transition flange fixing screw holes are arranged in a circular pattern. The number and specifications of the transition flange fixing screw holes are the same as the connection holes on the transformer tank cover or riser. The transition flange is connected to the transformer tank cover or riser through the transition flange fixing bolts; several bushing flange fixing screw holes are also provided on the upper surface of the transition flange. The bushing flange fixing screw holes are arranged in a circular pattern, and the number and specifications of the bushing flange fixing screw holes are the same as the connection holes on the bushing flange. The bushing flange is connected to the transition flange through the bushing flange fixing bolts; a disc spring and a flat washer are installed at the lower part of the end of the transition flange fixing bolt in a snap-on manner; the positions of the transition flange fixing screw holes and the bushing flange fixing screw holes do not interfere with each other.
[0006] Preferably, the size of the bushing flange is smaller than the installation interface of the transformer tank cover or riser. An inner ring gasket of the transition flange is installed in the sealing groove provided on the transformer tank cover or riser; a circle of inner ring sealing grooves is provided on the upper surface of the transition flange, and a bushing flange gasket is installed in the inner ring sealing grooves.
[0007] Preferably, the size of the bushing flange is larger than the installation interface of the transformer tank cover or riser. An inner ring gasket of the transition flange is installed in the sealing groove provided on the transformer tank cover or riser. A circle of outer ring sealing grooves is provided on the outer periphery of the bushing flange fixing screw holes on the lower surface of the transition flange, and an outer ring gasket of the transition flange is installed in the outer ring sealing grooves; a circle of inner ring sealing grooves is provided on the upper surface of the transition flange, and a bushing flange gasket is installed in the inner ring sealing grooves.
[0008] Preferably, the transition flange fixing bolts are hexagon socket head cap screws.
[0009] Preferably, the transition flange is made of low-alloy or low-magnetic steel plate material.
[0010] The beneficial effects of the present utility model:
[0011] The transformer bushing transition connection assembly provided by the present utility model can be used for the installation and fixation of bushings with different interface sizes, achieving the purpose of quickly installing bushings or replacing bushings of other brands and models, and solving the defects existing in the prior art; the disc spring and the flat washer are used to reinforce the transition flange fixing bolts to avoid loosening of the bolts caused by vibration during the operation of the transformer. Description of the Drawings
[0012] In order to more clearly illustrate the technical solutions of the present utility model, the drawings used in the technical solutions will be briefly introduced below;
[0013] Figure 1 It is a top view of the transition flange;
[0014] Figure 2 It is an assembly drawing of a transition flange when the size of the bushing flange is smaller than the installation interface;
[0015] Figure 3 It is an assembly drawing of a transition flange when the size of the bushing flange is larger than the installation interface;
[0016] Figure 4 It is a partial assembly drawing of the connection and fastening between the transition flange and the transformer oil tank or the riser;
[0017] In the figure, 1 - bushing; 2 - bushing flange gasket; 3 - bushing flange fixing bolt; 4 - bushing flange; 5 - transition flange fixing bolt; 6 - transition flange; 7 - transformer tank cover or riser flange; 8 - inner ring gasket of the transition flange; 9 - outer ring gasket of the transition flange; 10 - disc spring; 11 - flat washer; 12 - transition flange fixing screw hole; 13 - bushing flange fixing screw hole. Specific embodiments
[0018] Next, the technical solution of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments.
[0019] The transformer bushing transition connection assembly includes a transition flange 6, a transition flange fixing bolt 5, a bushing flange fixing bolt 3, a disc spring 10 and a flat washer 11. As Figure 1 shown, the transition flange 6 is a circular ring-shaped component. A number of transition flange fixing screw holes 12 with a cylindrical counterbore structure are drilled on the transition flange 6. The positions of the transition flange fixing screw holes 12 are arranged in a circular pattern. The spacing, quantity and specifications of the transition flange fixing screw holes 12 are consistent with the connection holes on the transformer tank cover or riser 7. The transition flange fixing screw holes 12 adopt a cylindrical counterbore design, which can sink the transition flange fixing bolt 5 below the upper surface of the transition flange 6 to avoid interference between the transition flange fixing bolt 5 and the bushing flange 4. Since the transition flange fixing bolt 5 is installed in a sunken manner and the diameter of the cylindrical counterbore cannot be too large, a conventional wrench cannot be inserted. Therefore, the transition flange fixing bolt 5 adopts an internal hexagonal bolt, which is convenient for installation. On the upper surface of the transition flange 6, there are bushing flange fixing screw holes 13 with an internal thread hole structure. The bushing flange fixing screw holes 13 are arranged in a circular pattern. The quantity and specifications of the bushing flange fixing screw holes 13 are consistent with the connection holes of the bushing flange 4. The thickness of the transition flange 6 is determined according to the counterbore depth of the transition flange fixing screw holes 12 and the required opening depth of the bushing flange fixing bolt 3.
[0020] The inner diameter Φd of the transition flange 6 is determined according to the oil end diameter of the bushing 1 and can be less than or equal to the original opening size of the transformer tank cover or the riser 7 so as to press the inner ring gasket 8 of the transition flange. The outer diameter ΦD of the transition flange 6 is determined according to the distribution diameter of the original bolt holes on the transformer tank cover or the riser 7 and the distribution diameter of the mounting holes of the bushing flange 4. According to the number of bolt holes, the positional relationship between the fixing screw holes 13 of the bushing flange and the fixing screw holes 12 of the transition flange is adjusted to ensure that the fixing screw holes 12 of the transition flange and the fixing screw holes 13 of the bushing flange do not overlap or interfere with each other. For example, the circumferential diameter formed by the fixing screw holes 12 of the transition flange is Φd1, and the circumferential diameter formed by the fixing screw holes 13 of the bushing flange is Φd2, and the fixing screw holes 12 of the transition flange and the fixing screw holes 13 of the bushing flange are arranged in a staggered and alternating manner.
[0021] Since the bushing flange 4 will block or completely cover the fixing bolts 5 of the transition flange after installation, in order to prevent the fixing bolts 5 of the transition flange from loosening due to the vibration during the operation of the transformer, two butting disc springs 10 and a flat washer 11 need to be installed at the lower part of the end of the fixing bolts 5 of the transition flange, as shown in the appendix Figure 4 shown. The number of the disc springs 10 can be increased according to the strength requirements such as the voltage level and weight of the bushing 1 to enhance the anti-seismic and anti-loosening ability of the fixing bolts 5 of the transition flange. It should be noted that the disc springs 10 should be installed in pairs by butting.
[0022] When the size of the bushing flange 4 is smaller than the installation interface of the transformer tank cover or the riser 7, the overall installation structure of the transformer bushing transition connection assembly is as shown in Figure 2 shown. The transition flange 6 is fixedly installed on the transformer tank cover or the riser 7 through the fixing bolts 5 of the transition flange; the upper surface of the transformer tank cover or the riser 7 usually has a built-in sealing groove, and the inner ring gasket 8 of the transition flange is installed in the built-in sealing groove for sealing to prevent the internal transformer oil from leaking. The bushing 1 is fixedly connected to the bushing flange 4, and the bushing 1 is installed on the transition flange 6 through the fixing bolts 3 of the bushing flange. A circle of inner ring sealing grooves is added on the upper surface of the transition flange 6, and the bushing flange gasket 2 is installed in the inner ring sealing grooves for sealing.
[0023] When the size of the bushing flange 4 is larger than the installation interface of the transformer tank cover or the riser 7, the overall installation structure of the transformer bushing transition connection assembly is as shown in Figure 3As shown. Since the dimensions of the bushing flange 4 and the installation interface dimensions have changed, at this time, the bushing flange fixing screw holes 13 are arranged on the outermost periphery, and the transition flange fixing screw holes 12 are on the inner periphery of the bushing flange fixing screw holes 13. A circle of outer ring sealing grooves is added to the outer periphery of the transition flange fixing screw holes 12 on the lower surface of the transition flange 6, and the transition flange outer ring sealing gaskets 9 are installed in the outer ring sealing grooves. A circle of inner ring sealing grooves (located inside the bushing flange fixing bolts 3) is arranged on the upper surface of the transition flange 6, and the bushing flange sealing gaskets 2 are installed in the inner ring sealing grooves. This prevents the internal transformer oil from flowing along the gap between the lower surface of the bushing flange 4 and the upper surface of the transition flange 6 and leaking out along the transition flange fixing screw holes 12.
[0024] Figure 3 and Figure 4 In [relevant content], different sealing structures are adopted for different dimensional structural combinations, which can effectively prevent the internal transformer oil from leaking out.
[0025] The transition flange 6 is made of low-alloy or low-magnetic steel plate material to improve the connection strength of the transition flange 6 and prevent the transition flange 6 from overheating in the leakage magnetic field.
[0026] In the embodiments of the present utility model, the technical features not described in detail are all prior arts or conventional technical means, and will not be elaborated herein.
[0027] Finally, it should be noted that: the above embodiments are only specific implementation manners of the present utility model, used to illustrate the technical solutions of the present utility model, rather than limiting it. The protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that: any person skilled in the art within the technical scope disclosed by the present utility model can modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be covered within the protection scope of the present utility model.
Claims
1. Transition connection assembly for transformer bushing, characterized in that: It includes a transition flange, transition flange fixing bolts, bushing flange fixing bolts, disc springs and flat washers; the transition flange is a circular-section steel component, and several transition flange fixing screw holes are provided on the upper surface of the transition flange. The transition flange fixing screw holes adopt a cylindrical counterbore design, and the positions of the transition flange fixing screw holes are arranged in a circle. The number and specifications of the transition flange fixing screw holes are the same as the connection holes on the transformer tank cover or riser. The transition flange is connected to the transformer tank cover or riser through the transition flange fixing bolts; several bushing flange fixing screw holes are also provided on the upper surface of the transition flange. The bushing flange fixing screw holes are arranged in a circle, and the number and specifications of the bushing flange fixing screw holes are the same as the connection holes on the bushing flange. The bushing flange is connected to the transition flange through the bushing flange fixing bolts; a disc spring and a flat washer installed in a snap-on manner are added to the lower part of the end of the transition flange fixing bolt; the positions of the transition flange fixing screw holes and the bushing flange fixing screw holes do not interfere with each other.
2. The transformer bushing transition connection assembly according to claim 1, wherein: The size of the bushing flange is smaller than the installation interface of the transformer tank cover or riser, and an inner ring gasket of the transition flange is installed in the sealing groove provided on the transformer tank cover or riser itself; a circle of inner ring sealing grooves is provided on the upper surface of the transition flange, and a bushing flange gasket is installed in the inner ring sealing grooves.
3. The transformer bushing transition connection assembly according to claim 1, characterized in that: The size of the bushing flange is larger than the installation interface of the transformer tank cover or riser. An inner ring gasket of the transition flange is installed in the sealing groove provided on the transformer tank cover or riser itself. A circle of outer ring sealing grooves is provided on the outer periphery of the bushing flange fixing screw holes on the lower surface of the transition flange, and an outer ring gasket of the transition flange is installed in the outer ring sealing grooves; a circle of inner ring sealing grooves is provided on the upper surface of the transition flange, and a bushing flange gasket is installed in the inner ring sealing grooves.
4. The transformer bushing transition connection assembly according to any one of claims 1-3, characterized in that: The transition flange fixing bolts are hexagon socket head cap screws.
5. The transformer bushing transition connection assembly according to any one of claims 1-3, characterized in that: The transition flange is made of low-alloy or low-magnetic steel plate material.