Connecting structure and transformer

Abstract

The utility model belongs to the technical field of transformers, and discloses a connecting structure and a transformer. The connecting structure comprises a first flange, a second flange and a fastener, a first metal gasket and a second metal gasket are arranged on the opposite faces of a first through hole and a second through hole which are opposite to each other in the first flange and the second flange respectively, and the fastener penetrates through the first through hole, the second through hole, a hole of the first metal gasket and a hole of the second metal gasket. One end of the fastener is electrically connected with the first metal washer, and the other end of the fastener is electrically connected with the second metal washer, so that the first flange is electrically connected with the second flange, and when any one of the components is grounded, the first flange, the second flange, the first connecting pipe and the second connecting pipe can be reliably and electrically connected; compared with the scheme of welding the grounding nut on the curved surface in the prior art, the manufacturing process of welding the metal washer on the flange is simpler, the cost is lower, the technical difficulty and the operation risk in the welding process are reduced, and the manufacturing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a connection structure and a transformer. Background Art

[0002] During the manufacturing process of liquid-immersed power transformers, due to the size restrictions of the couplings in manufacturing and transportation, the couplings need to be connected with flanges at appropriate locations. When the power transformer is in operation, a certain amount of charge will be induced on each metal part, and the flanges generally have a thicker paint coating due to the anti-corrosion requirements of the on-site environment. This results in no effective electrical connection between the various couplings disconnected by the flanges. Grounding stainless steel nuts and grounding wires are required to electrically connect the various parts to complete reliable grounding of each part.

[0003] like Figure 1 As shown, the conventional connection method between the first connecting pipe 10 and the second connecting pipe 20 requires two grounding nuts 50 and a grounding wire 60 to complete. The grounding nuts 50 are respectively welded on the first connecting pipe 10 and the second connecting pipe 20 transitionally connected through the first flange 30 and the second flange 40. The grounding nuts 50 are made of stainless steel. The two ends of the grounding wire 60 are respectively connected to the two grounding nuts 50. The connecting part between the grounding nuts 50 and the grounding wire 60 is not painted to complete the electrical connection between the first connecting pipe 10 and the second connecting pipe 20, so that when any one of the components is grounded, the first connecting pipe 10 and the second connecting pipe 20 are connected. 0. Both the first flange 110 and the second flange 120 can be grounded, but since the surfaces of the first connecting pipe 10 and the second connecting pipe 20 are mostly arc-shaped curved surfaces, the shape of the grounding nut 50 needs to be precisely designed to ensure that the grounding nut 50 perfectly fits the surfaces of the first connecting pipe 10 and the second connecting pipe 20, which will increase the cost; in addition, when welding the grounding nut 50, it is necessary to consider the material and thickness of the first connecting pipe 10 and the second connecting pipe 20, and accurately adjust the welding temperature, welding time, etc. to ensure that the welding process will not cause damage or deformation to the first connecting pipe 10 and the second connecting pipe 20. The welding process is complicated and the production efficiency is low.

[0004] Therefore, a connection structure is urgently needed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a connection structure, which simplifies the structure when the first connecting pipe and the second connecting pipe are connected, reduces the cost, reduces the technical difficulty and operation risk in the welding process, and improves the manufacturing efficiency.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A connecting structure comprising a first flange, a second flange and a fastener;

[0008] The first surface of the first flange contacts the first surface of the second flange, the second surface of the first flange is electrically connected to a first metal gasket, and the second surface of the second flange is electrically connected to a second metal gasket;

[0009] The first flange is provided with a first through hole, the second flange is provided with a second through hole, and the hole of the first metal gasket, the hole of the second metal gasket, the first through hole and the second through hole correspond to each other;

[0010] The fastener is inserted into the first through hole, the second through hole, the hole of the first metal washer and the hole of the second metal washer, and one end of the fastener is electrically connected to the first metal washer, and the other end of the fastener is electrically connected to the second metal washer.

[0011] Optionally, the connection structure further includes a connection accessory, which is arranged between the first flange and the second flange, and the fastener is passed through the connection accessory, and the fastener is used to electrically connect the first flange, the connection accessory and the second flange.

[0012] Optionally, the connection accessories include a butterfly valve, a ball valve, or a desiccant.

[0013] Optionally, an inner diameter of the first metal washer is greater than or equal to a diameter of the first through hole, and an inner diameter of the second metal washer is greater than or equal to a diameter of the second through hole.

[0014] Optionally, a first protective paper is provided on a side of the first metal gasket facing away from the first flange, and a second protective paper is provided on a side of the second metal gasket facing away from the second flange.

[0015] Optionally, the first metal washer includes a stainless steel washer, and / or the second metal washer includes a stainless steel washer.

[0016] Optionally, the fastener includes a bolt and a nut, the bolt is passed through the first through hole, the second through hole, the hole of the first metal washer and the hole of the second metal washer, and the nut is fastened to the bolt.

[0017] Optionally, the connection structure includes a connection accessory, the fastener includes a special-shaped stud bolt and two nuts, the special-shaped stud bolt is passed through and confined in the connection accessory, the first end of the special-shaped stud bolt is passed through the first through hole and the hole of the first metal washer and is threadedly connected to one of the two nuts, and the second end of the special-shaped stud bolt is passed through the second through hole and the hole of the second metal washer and is threadedly connected to the other of the two nuts.

[0018] Optionally, the specification of the first metal washer includes flat washer grade A, and the specification of the second metal washer includes flat washer grade A.

[0019] The utility model aims to provide a transformer, which improves the safety and stability of the transformer.

[0020] To achieve this purpose, the utility model adopts the following technical solutions:

[0021] A transformer comprises a first connecting pipe, a second connecting pipe and the above-mentioned connecting structure, wherein the first connecting pipe and the second connecting pipe are connected via the connecting structure.

[0022] Beneficial effects:

[0023] The utility model provides a connection structure, including a first flange, a second flange and a fastener, wherein the first flange is provided with a first through hole, the second flange is provided with a second through hole, the first surface of the first flange contacts the first surface of the second flange, the second surface of the first flange is electrically connected to a first metal gasket, the second surface of the second flange is electrically connected to a second metal gasket, the hole of the first metal gasket, the hole of the second metal gasket, the first through hole and the second through hole correspond to each other, the fastener is penetrated through the first through hole, the second through hole, the hole of the first metal gasket and the hole of the second metal gasket, and one end of the fastener is electrically connected to the first metal gasket, and the other end of the fastener is electrically connected to the second metal gasket, so that the adjacent first flange and the second flange are electrically connected, so that when the first connecting pipe and the second connecting pipe are transitionally connected through the first flange and the second flange, when any one of the components is grounded, the first flange, the second flange, the first connecting pipe and the second connecting pipe can all be reliably electrically connected, and compared with the solution of welding a grounding nut on a curved surface in the prior art, the manufacturing process of welding a metal gasket on a flange is simpler and the cost is lower, the technical difficulty and operation risk in the welding process are reduced, and the manufacturing efficiency is improved.

[0024] The transformer provided by the utility model comprises a first connecting pipe, a second connecting pipe and the above-mentioned connection structure. The first connecting pipe and the second connecting pipe are connected by the connection structure, which can ensure the electrical connection and mechanical connection between the first connecting pipe and the second connecting pipe. When any one of the components is grounded, the first connecting pipe, the second connecting pipe, the first flange and the second flange can all be reliably grounded, thereby improving the safety and stability of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the connection structure between the connecting pipes in the prior art;

[0026] Figure 2 It is a schematic diagram of the connection structure provided by the utility model without connecting accessories;

[0027] Figure 3It is a schematic diagram of the structure of the connection structure provided by the utility model including the connection accessories;

[0028] Figure 4 It is an exploded view of the connection structure provided by the utility model including the connection accessories.

[0029] In the figure:

[0030] 10. First joint pipe; 20. Second joint pipe; 30. First flange; 40. Second flange; 50. Grounding nut; 60. Grounding wire;

[0031] 110. First flange; 120. Second flange; 210. First connecting pipe; 220. Second connecting pipe; 310. First metal washer; 320. Second metal washer; 400. Fastener; 410. Bolt; 420. Nut; 430. Flat washer; 440. Spring washer; 450. Special-shaped stud bolt; 500. Connecting accessories. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] This embodiment provides a connection structure for connecting adjacent first connecting pipes 210 and second connecting pipes 220 together. Figure 2 As shown, the connection structure includes a first flange 110, a second flange 120 and a fastener 400, the first flange 110 is provided with a first through hole, the second flange 120 is provided with a second through hole, the first surface of the first flange 110 is in contact with the first surface of the second flange 120, the second surface of the first flange 110 is electrically connected to the first metal gasket 310, the second surface of the second flange 120 is electrically connected to the second metal gasket 320, the hole of the first metal gasket 310, the hole of the second metal gasket 320, the first through hole and the second through hole correspond to each other, the fastener 400 is penetrated through the first through hole, the second through hole, the hole of the first metal gasket 310 and the hole of the second metal gasket 320, and one end of the fastener 400 is connected to the The first metal washer 310 is electrically connected, and the other end of the fastener 400 is electrically connected to the second metal washer 320, so that the adjacent first flange 110 and the second flange 120 are electrically connected. When the first connecting pipe 210 and the second connecting pipe 220 are transitionally connected through the first flange 110 and the second flange 120, when any one of the components is grounded, the first flange 110, the second flange 120, the first connecting pipe 210 and the second connecting pipe 220 can all be reliably electrically connected. Compared with the solution of welding the grounding nut 420 on the curved surface in the prior art, the manufacturing process of welding the metal washer on the flange is simpler and has lower cost, reduces the technical difficulty and operation risk in the welding process, and improves the manufacturing efficiency.

[0037] Alternatively, if Figure 3-Figure 4As shown, the connection structure further includes a connection accessory 500, which is arranged between the adjacent first flange 110 and the second flange 120, and the fastener 400 is passed through the connection accessory 500 and electrically connected to the connection accessory 500. On the premise that both ends of the fastener 400 are electrically connected to the first metal gasket 310 and the second metal gasket 320 respectively, the adjacent first flange 110 and the second flange 120 are electrically connected. When the connection accessory 500 is arranged between the first flange 110 and the second flange 120 according to the connection requirements, it is only necessary to ensure that the fastener 400 is electrically connected to the connection accessory 500, so as to ensure that the accessory and the first flange 110, the connection accessory 500 and the second flange 120 are electrically connected to form a conductive path. When any one of the first flange 110, the connection accessory 500 and the second flange 120 is grounded, the components on the entire conductive path can be reliably grounded, thereby avoiding the situation where the connection accessory 500 is charged, thereby improving safety.

[0038] Optionally, the connection accessory 500 includes a butterfly valve, a ball valve or a desiccant. The selection of the connection accessory 500 is flexible, and any type of connection accessory 500 such as a butterfly valve, a ball valve, a desiccant, etc. can be selected according to specific needs. Such a design makes the connection structure more diverse and more widely applicable, meeting the connection requirements in different scenarios. For example, a butterfly valve and a ball valve can be used to control the flow of a fluid medium, while a desiccant can be used to remove moisture from a fluid medium. Different types of connection accessories 500 are selected according to specific circumstances, further improving the flexibility and practicality of the connection structure.

[0039] Optionally, the inner diameter of the first metal washer 310 is greater than or equal to the diameter of the first through hole, and the inner diameter of the second metal washer 320 is greater than or equal to the diameter of the second through hole, ensuring that the fastener 400 will not interfere with the first metal washer 310 when passing through the first through hole, and ensuring that the fastener 400 will not interfere with the second metal washer 320 when passing through the second through hole, thereby reducing the resistance of the fastener 400 during the penetration process and improving the convenience of installing the fastener 400.

[0040] Optionally, in this embodiment, the first metal gasket 310 is connected to the second side of the first flange 110 by welding, and the second metal gasket 320 is connected to the second side of the second flange 120 by welding. After the first metal gasket 310 and the second metal gasket 320 are respectively welded, protective paper is affixed to the side of the first metal gasket 310 away from the first flange 110, and protective paper is affixed to the side of the second metal gasket 320 away from the second flange 120, to ensure that when the first connecting pipe 210, the second connecting pipe 220, the first flange 110, and the second flange 120 are subsequently sprayed with paint as a whole, paint is prevented from splashing onto the side of the first metal gasket 310 away from the first flange 110, and paint is prevented from splashing onto the side of the second metal gasket 320 away from the second flange 120, so as to prevent the paint from affecting its electrical connection effect.

[0041] In the actual production process, appropriate protective paper materials, such as chemical-resistant paper or plastic film, can be selected to ensure that it can withstand the effects of chemical solvents during the painting process and will not affect the protective effect on the metal gasket due to the shedding or damage of the protective paper.

[0042] Furthermore, when pasting the protective paper, the protective paper should completely protect the side of the first metal gasket 310 facing away from the first flange 110, and the side of the second metal gasket 320 facing away from the second flange 120, thereby ensuring that the first metal gasket 310 and the second metal gasket 320 are fully protected during the painting process, and ensuring that there is sufficient area on the first metal gasket 310 and the second metal gasket 320 to contact the fastener 400, thereby improving the reliability of the electrical connection.

[0043] In this embodiment, the first metal washer 310 includes a first stainless steel washer, and the second metal washer 320 includes a second stainless steel washer. Stainless steel has corrosion resistance, wear resistance and excellent electrical conductivity. The use of stainless steel washers can ensure the long-term stability and reliability of the connection structure in harsh environments, while improving the efficiency and durability of electrical connections.

[0044] In other embodiments, one of the first metal washer 310 and the second metal washer 320 is a stainless steel washer, and the other of the first metal washer 310 and the second metal washer 320 can be a washer made of metal materials such as copper, iron, and steel, which can save costs while taking into account conductivity.

[0045] It can be understood that the first flange 110 is provided with a plurality of first through holes at circumferential intervals, and the second flange 120 is provided with a plurality of second through holes at circumferential intervals, and the first through holes correspond to the second through holes one by one. When the first flange 110 and the second flange 120 are butt-jointed, the electrical connection conditions can be met by welding the first stainless steel gasket and the second stainless steel gasket on the opposite sides of a pair of opposite first through holes and the second through holes, respectively. This ensures the reliability of the electrical connection, reduces the use of materials and costs, and improves the simplicity and economy of the connection structure.

[0046] Alternatively, if Figure 2 As shown, the fastener 400 includes a bolt 410 and a nut 420. The bolt 410 is inserted into the first through hole, the second through hole, the hole of the first metal washer 310 and the hole of the second metal washer 320. The nut 420 is fastened to the bolt 410, and the bolt cap of the bolt 410 abuts against the first metal washer 310. After the nut 420 is fastened to the bolt 410, the nut 420 abuts against the second metal washer 320. The bolt 410, the nut 420, the first metal washer 310 and the second metal washer 320 are electrically connected, thereby ensuring that the first flange 110 and the second flange 120 are electrically connected, thereby ensuring that the first connecting pipe 210 and the second connecting pipe 220 connected by the transition of the first flange 110 and the second flange 120 are electrically connected. When any one of the components is grounded, the first flange 110, the second flange 120, the first connecting pipe 210 and the second connecting pipe 220 can all be reliably grounded, thereby avoiding the situation where the first connecting pipe 210 and the second connecting pipe 220 are charged.

[0047] Alternatively, if Figure 3-Figure 4 As shown, when the connection structure includes the connection accessory 500, the fastener 400 includes a special-shaped stud bolt 450 and two nuts 420. The special-shaped stud bolt 450 is inserted and limited in the connection accessory 500. The first end of the special-shaped stud bolt 450 is inserted in the first through hole and the hole of the first metal washer 310 and is threadedly connected to one of the two nuts 420. The second end of the special-shaped stud bolt 450 is inserted in the second through hole and the hole of the second metal washer 320 and is threadedly connected to the other of the two nuts 420. The double-head design of the special-shaped stud bolt 450 makes the installation process simpler and more convenient. When installing the connection accessory 500, the installer only needs to insert the two ends of the special-shaped stud bolt 450 into the first through hole and the second through hole respectively, and then threadedly connect them with the two nuts 420. No additional positioning or adjustment steps are required, which saves the installation time of the connection accessory 500.

[0048] Optionally, the special-shaped stud bolt 450 includes a screw rod having threads at both ends of the screw rod, a limiting protrusion is provided in the middle of the screw rod, and a limiting groove is provided in the connecting accessory 500. When the screw rod is inserted into the connecting accessory 500, the limiting protrusion on the screw rod is limited in the limiting groove, ensuring that the screw rod is accurately positioned and will not rotate, thereby ensuring the stability and reliability of the connecting structure during use and preventing connection failure caused by loosening or offset of the screw rod.

[0049] Optionally, the specifications of the first metal gasket 310 include flat gasket grade A, and the specifications of the second metal gasket 320 include flat gasket grade A, so as to ensure that when the first metal gasket 310 is welded to the first flange 110, there is sufficient weld height to ensure the stability of the connection between the first metal gasket 310 and the first flange 110, and to ensure that when the second metal gasket 320 is welded to the second flange 120, there is sufficient weld height to ensure the stability of the connection between the second metal gasket 320 and the second flange 120.

[0050] Specifically, the manufacturing and assembly process of the connection structure is described in detail below:

[0051] First, the first stainless steel washer and the second stainless steel washer are welded on the opposite sides of the first through hole and the second through hole of the adjacent first flange 110 and the second flange 120. In principle, the bolt 410, the first stainless steel washer and the second stainless steel washer are all standard parts, and the models of the first stainless steel washer and the second stainless steel washer should be one specification larger than the model of the bolt 410. The specific size correspondence between the bolt 410, the first through hole, the second through hole, the first stainless steel washer and the second stainless steel washer is as follows:

[0052] Table 1 shows the correspondence between the nominal diameter of the bolt, the inner diameter and outer diameter of the first stainless steel washer, and the inner diameter of the first through hole;

[0053] Table 2 shows the correspondence between the nominal diameter of the bolt, the inner diameter and outer diameter of the second stainless steel washer, and the inner diameter of the second through hole.

[0054] Table 1

[0055]

[0056] Table 2

[0057]

[0058] It can be seen from Table 1 and Table 2 that when the model of the first stainless steel washer and the second stainless steel washer is one specification larger than the model of the bolt 410, the inner diameter of the first stainless steel washer and the inner diameter of the second stainless steel washer are both larger than the inner diameter of the connecting hole, ensuring that the bolt can pass through the first through hole and the second through hole more smoothly, thereby improving the convenience of assembly.

[0059] It should be noted that the above table only lists the correspondence between several common bolt models and the first through hole, the first stainless steel washer, the second through hole and the second stainless steel washer. In actual use, bolts and stainless steel washers of other specifications can be selected according to specific circumstances. The selection rule satisfies that the model of the stainless steel washer is one specification larger than the model of the bolt.

[0060] Among them, the first stainless steel washer should use flat washers of grade A GB / T97.1, so that the first stainless steel washer can be welded to the first flange 110, and the weld height should be equal to the thickness of the first stainless steel washer to ensure that the first stainless steel washer and the first flange 110 have sufficient connection strength; the second stainless steel washer should use flat washers of grade A GB / T97.1, so that the second stainless steel washer can be welded to the second flange 120, and the weld height should be equal to the thickness of the second stainless steel washer to ensure that the second stainless steel washer and the second flange 120 have sufficient connection strength.

[0061] After welding is completed, protective paper is pasted on the surface of the first stainless steel gasket away from the first flange 110, and the protective paper should completely protect the surface of the first stainless steel gasket away from the first flange 110. Protective paper is pasted on the surface of the second stainless steel gasket away from the second flange 120, and the protective paper should completely protect the surface of the second stainless steel gasket away from the first flange 110. Then, the first connecting pipe 210, the second connecting pipe 220, the first flange 110, the second flange 120, etc. are spray-painted as a whole.

[0062] When in use, remove the protective paper, select appropriate bolts 410 according to the sizes of the first through hole and the second through hole, and then, sequentially put flat washers 430, spring washers 440, and nuts 420 corresponding to the nominal diameters of the bolts 410 on the ends of the bolts 410, and tighten the nuts 420 to abut against the corresponding stainless steel washers.

[0063] Since the surface of the first stainless steel gasket away from the first flange 110 has no paint coating, the surface of the second stainless steel gasket away from the second flange 120 has no paint coating, and the first stainless steel gasket and the second stainless steel gasket themselves have the characteristics of rust and corrosion resistance, the connection structure can complete the electrical connection between the first joint pipe 210, the second joint pipe 220, the first flange 110, and the second flange 120. When there is a butterfly valve between the first flange 110 and the second flange 120, the butterfly valve can also complete the electrical connection with the first stainless steel gasket on the first flange 110 and the second stainless steel gasket on the second flange 120 through the special-shaped stud bolts 410. When any of these components is grounded, the first flange 110, the second flange 120, the butterfly valve, the first joint pipe 210, and the second joint pipe 220 can all be reliably grounded.

[0064] The present embodiment also provides a transformer, including a first connecting pipe 210, a second connecting pipe 220 and the above-mentioned connection structure. The first connecting pipe 210 and the second connecting pipe 220 are connected by the above-mentioned connection structure, which can ensure the electrical connection and mechanical connection between the first connecting pipe 210 and the second connecting pipe 220. When any one of the components is grounded, the first flange 110, the second flange 120, the first connecting pipe 210 and the second connecting pipe 220 can all be reliably grounded, thereby improving the safety and stability of the transformer.

[0065] Optionally, the first connecting pipe 210 and the second connecting pipe 220 can be connected through the above-mentioned connection structure to serve as an oil circuit, so that the transformer oil circulates inside the transformer. Specifically, two oil circuits can be set between the oil tank and the radiator of the transformer to ensure that the hot oil flows out from the inside of the transformer and returns after being cooled by the radiator, so as to ensure that the transformer operates within a normal temperature range, thereby ensuring the safety and reliability of the transformer.

[0066] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A connection structure, characterized in that: include: A first flange (110), a second flange (120) and a fastener (400); The first surface of the first flange (110) is in contact with the first surface of the second flange (120); the second surface of the first flange (110) is electrically connected to a first metal gasket (310); and the second surface of the second flange (120) is electrically connected to a second metal gasket (320); The first flange (110) is provided with a first through hole, the second flange (120) is provided with a second through hole, and the hole of the first metal gasket (310), the hole of the second metal gasket (320), the first through hole and the second through hole correspond to each other; The fastener (400) is inserted into the first through hole, the second through hole, the hole of the first metal washer (310), and the hole of the second metal washer (320), and one end of the fastener (400) is electrically connected to the first metal washer (310), and the other end of the fastener (400) is electrically connected to the second metal washer (320).

2. The connection structure according to claim 1, characterized in that: The connection structure also includes a connection accessory (500), which is arranged between the first flange (110) and the second flange (120), and the fastener (400) is passed through the connection accessory (500) to electrically connect the first flange (110), the connection accessory (500) and the second flange (120).

3. The connection structure according to claim 2, characterized in that: The connection accessory (500) includes a butterfly valve, a ball valve, or a desiccant.

4. The connection structure according to claim 1, characterized in that: The inner diameter of the first metal washer (310) is greater than or equal to the diameter of the first through hole, and the inner diameter of the second metal washer (320) is greater than or equal to the diameter of the second through hole.

5. The connection structure according to claim 1, characterized in that: A first protective paper is provided on the side of the first metal gasket (310) facing away from the first flange (110), and a second protective paper is provided on the side of the second metal gasket (320) facing away from the second flange (120).

6. The connection structure according to claim 1, characterized in that: The first metal washer (310) includes a stainless steel washer, and / or the second metal washer (320) includes a stainless steel washer.

7. The connection structure according to claim 1, characterized in that: The fastener (400) comprises a bolt (410) and a nut (420); the bolt (410) is inserted into the first through hole, the second through hole, the hole of the first metal washer (310) and the hole of the second metal washer (320); and the nut (420) is fastened to the bolt (410).

8. The connection structure according to claim 7, characterized in that: The connection structure comprises a connection accessory (500), the fastener (400) comprises a special-shaped stud bolt (450) and two nuts (420), the special-shaped stud bolt (450) is passed through and limited in the connection accessory (500), the first end of the special-shaped stud bolt (450) is passed through the first through hole and the hole of the first metal washer (310) and is threadedly connected to one of the two nuts (420), and the second end of the special-shaped stud bolt (450) is passed through the second through hole and the hole of the second metal washer (320) and is threadedly connected to the other of the two nuts (420).

9. The connection structure according to any one of claims 1 to 8, characterized in that: The specification of the first metal washer (310) includes flat washer grade A, and the specification of the second metal washer (320) includes flat washer grade A.

10. A transformer, characterized in that It comprises a first connecting pipe (210), a second connecting pipe (220) and a connecting structure according to any one of claims 1 to 9, wherein the first connecting pipe (210) and the second connecting pipe (220) are connected via the connecting structure.

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