Pressure-resistant structure of corrugated oil tank of transformer

Abstract

The utility model discloses a compression-resistant structure of a transformer corrugated oil tank, which relates to the technical field of transformer corrugated oil tanks, and comprises a tank body, an upper end of which is provided with a bending part towards the outer side; the corrugated sheet is arranged on the outer side wall of the box body and communicates with the interior of the box body, and the upper side of the corrugated sheet is provided with an expansion strip which extends in the height direction of the corrugated sheet and protrudes. According to the device, the heat dissipation efficiency of the corrugated sheets is improved, and the anti-pressure capability of the oil tank is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer corrugated oil tanks, in particular to a transformer corrugated oil tank pressure-resistant structure. Background Art

[0002] The oil tank of an oil-immersed transformer is the outer shell of the transformer. It contains the iron core and windings and is filled with transformer oil, so that the iron core and windings are immersed in the oil tank. The transformer oil plays an insulating and heat dissipating role. When the temperature of the oil-immersed transformer rises during operation, the volume of the internal insulating oil expands, which will put a lot of tension on the tank structure. The corrugated sheet is welded to the wall of the tank. When the insulating oil in the tank expands due to heat, the corrugated sheet will also expand, which can easily cause the welding point between the corrugated oil tank and the corrugated sheet to crack, affecting the service life of the corrugated oil tank.

[0003] The patent (publication number: CN210403449U) discloses a reinforced pressure-resistant transformer corrugated oil tank, including a tank body, a tank cover and a corrugated sheet layer. The upper edge of the tank body is provided with a folded edge and connected to the tank cover, the bottom of the tank body is provided with a bottom plate, and the side walls of the tank body are connected to the corrugated sheet layer. Reinforcing ribs are provided between the corrugated sheets of the corrugated sheet layer, and the side ends of the corrugated sheets away from the tank body are provided with expansion blocks to protect the corrugated sheets. The bottom plate is provided with positioning columns at positions corresponding to the reinforcing ribs, and is connected to the reinforcing ribs through the positioning columns. The reinforced pressure-resistant transformer corrugated oil tank has the function of regulating the internal pressure of the tank body, avoiding cracking of welding points between the corrugated sheets and the periphery of the corrugated oil tank, and extending the service life of the transformer. The oil tank is provided with a bottom plate at the bottom of the box body, and reinforcing ribs are provided between the corrugated sheets. Positioning columns are provided at the positions corresponding to the reinforcing ribs on the bottom plate, and the bottom plate is connected to the reinforcing ribs through the positioning columns. Although this structure can increase the stability of the corrugated sheet layer, it will also have an adverse effect on the air circulation between the side walls of the corrugated sheets in the corrugated sheet layer, thereby affecting the heat dissipation efficiency of the corrugated sheets. Although expansion blocks are provided at the side ends of the corrugated sheets away from the box body to help the corrugated sheets absorb heat and produce thermal deformation, the oil temperature of the upper part of the transformer is higher than that of the lower part, resulting in the oil temperature of the upper part of the corrugated sheet being higher than that of the lower part, which also affects the heat dissipation efficiency of the expansion blocks. Low heat dissipation efficiency will in turn have an adverse effect on the pressure resistance of the oil tank. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides a transformer corrugated oil tank pressure-resistant structure, which improves the heat dissipation efficiency of the corrugated sheets and enhances the pressure-resistant capacity of the oil tank.

[0005] In order to achieve the above utility model purpose, the technical solution of the utility model is as follows:

[0006] The transformer corrugated oil tank pressure-resistant structure includes:

[0007] The box body has a bent portion at its upper end facing outward;

[0008] The corrugated sheet is arranged on the outer side wall of the box body and is communicated with the interior of the box body. The upper side of the corrugated sheet is provided with a protruding expansion strip extending along the height direction thereof.

[0009] Furthermore, the expansion strip has a semicircular cross section, and the bottom of the outer side wall of the expansion strip is aligned with the outer side wall of the corrugated sheet.

[0010] Furthermore, the box body also includes:

[0011] A triangular steel is arranged from top to bottom at the connection between the adjacent inner side walls of the box;

[0012] The first transverse reinforcing rib has two ends connected to the adjacent triangular steels respectively, and a middle portion connected to the inner side wall of the box body.

[0013] Furthermore, the box body also includes:

[0014] The first vertical reinforcing rib is arranged between the inner wall and the bottom of the box body.

[0015] Furthermore, second transverse reinforcing ribs are respectively provided at the upper end and the lower end of the outer side of the corrugated sheet of the same side wall of the box body.

[0016] Furthermore, the box body also includes:

[0017] The second vertical reinforcing rib is arranged between the bent portion and the outer side wall of the box body.

[0018] The utility model at least has the following beneficial effects:

[0019] 1. The utility model provides a transformer corrugated oil tank pressure-resistant structure, in which corrugated sheets are arranged on the outer wall of the box body, and expansion strips are arranged on the upper side of the corrugated sheets. When the insulating oil in the box body heats up and the pressure in the box body increases, more heat can be absorbed by replacing the corrugated sheets, and the heat dissipation efficiency of the corrugated sheets and the expansion strips can be better improved, so as to avoid cracking of the welding points between the corrugated sheets and the periphery of the box body, thereby improving the pressure resistance of the oil tank and extending the service life of the transformer.

[0020] 2. The expansion strip has a semicircular cross section, and the bottom of the outer side wall of the semicircular expansion strip is aligned with the outer side wall of the corrugated sheet. In this way, when the expansion strip is heated and expanded, it has a relatively large heat dissipation area and has little effect on the air circulation of the side wall of the corrugated sheet.

[0021] 3. The upper and lower ends of the outer sides of the corrugated sheets on the same side wall of the box body are respectively provided with second transverse reinforcing ribs to improve the rigidity of the corrugated sheets and avoid the adverse effects of the reinforcing ribs on the air circulation between the side walls of the corrugated sheets, thereby not affecting the heat dissipation efficiency of the side walls of the corrugated sheets.

[0022] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a front view of the compression-resistant structure of the transformer corrugated oil tank in one technical solution of the utility model.

[0024] Figure 2 This is a top view of the compression-resistant structure of the transformer corrugated oil tank in one technical solution of the utility model (excluding the tank cover).

[0025] Figure 3 for Figure 2 Cross-section of the corrugated sheet and expansion strip along AA direction.

[0026] In the figure, 1, box body; 11, bending part; 12, triangular steel; 13, first transverse reinforcing rib; 14, first vertical reinforcing rib; 15, second vertical reinforcing rib; 2, corrugated sheet; 21, expansion strip; 22, second transverse reinforcing rib; 3, box cover. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0028] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial sources unless otherwise specified; in the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected, set, or detachably connected, set, or connected and set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood in specific circumstances. The orientation or position relationship indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "counterclockwise", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0029] Example

[0030] like Figure 1 and Figure 2 As shown, the utility model provides a transformer corrugated oil tank pressure-resistant structure, comprising:

[0031] The box body 1 has a bent portion 11 on its upper end facing outward, and the bent portion 11 can improve the rigidity of the box body 1. The bent portion 11 is provided with a mounting hole. The box body 1 is connected to the box cover 3 through the bent portion 11. When connected, a sealing ring is placed at the connection between the bent portion 11 and the box cover 3.

[0032] The corrugated sheet 2 is arranged on the outer wall of the box body 1 and communicated with the inside of the box body 1. The upper side of the corrugated sheet 2 is provided with a protruding expansion strip 21 extending along the height direction thereof. The corrugated sheet 2 and the expansion strip 21 are both hollow structures and communicated with each other.

[0033] The working principle of this device is as follows:

[0034] When the insulating oil in the box body 1 heats up and the pressure in the box increases, the oil entering the corrugated sheet 2 will enter the expansion strip 21, and the expansion strip 21 absorbs the heat of the oil and expands due to the heat, and then bulges upward. Compared with the structure in which only the corrugated sheet absorbs heat and expands, the expansion strip 21 can help the corrugated sheet 2 absorb heat and produce thermal deformation, that is, the expansion surface of the expansion strip 21 undergoes thermal deformation and expands upward, thereby increasing the heat dissipation area, and avoiding excessive thermal deformation caused by the corrugated sheet 2 absorbing heat, which may cause cracking of the welding points around the corrugated sheet 2 and the box body 1, thereby damaging the corrugated oil tank. When the insulating oil in the box body 1 cools down and the pressure in the box decreases, the expansion strip 21 recovers its deformation. The expansion strip 21 provided on the corrugated sheet 2 can absorb more heat and produce thermal deformation instead of the corrugated sheet 2, thereby reducing the thermal deformation of the corrugated sheet 2. Moreover, the temperature of the insulating oil in the upper part of the corrugated sheet 2 is relatively high, and the expansion strip 21 is provided on the upper side of the corrugated sheet 2, which is more conducive to improving the heat dissipation efficiency of the corrugated sheet 2 and the expansion strip 21, improving the pressure resistance of the oil tank, and extending the service life of the transformer.

[0035] In summary, the utility model provides a transformer corrugated oil tank pressure-resistant structure, in which a corrugated sheet 2 is arranged on the outer wall of the box body 1, and an expansion strip 21 is arranged on the upper side of the corrugated sheet 2. When the insulating oil in the box body 1 heats up and the pressure in the box increases, more heat can be absorbed by replacing the corrugated sheet 2, and the heat dissipation efficiency of the corrugated sheet 2 and the expansion strip 21 can be better improved, thereby avoiding cracking of the welding points around the corrugated sheet 2 and the box body 1, improving the pressure resistance of the oil tank, and extending the service life of the transformer.

[0036] The expansion strip 21 has a semicircular cross section, and the bottom of the outer wall of the semicircular expansion strip 21 is aligned with the outer wall of the corrugated sheet 2. In this way, when the expansion strip 21 is heated and expanded, it has a relatively large heat dissipation area and has little effect on the air circulation of the side wall of the corrugated sheet 2. Figure 3 shown.

[0037] In another technical solution, the box 1 further includes:

[0038] A triangular steel 12 is arranged from top to bottom at the connection between the adjacent inner walls of the box body 1;

[0039] The first transverse reinforcing rib 13 has two ends connected to the adjacent triangular steels 12 respectively, and a middle portion connected to the inner wall of the box body 1, so as to improve the overall rigidity of the box body 1 and prevent the side wall of the box body 1 from being deformed due to heat.

[0040] In another technical solution, the box 1 further includes:

[0041] The first vertical reinforcing rib 14 is arranged between the side wall and the bottom of the box body 1. A plurality of first vertical reinforcing ribs 14 are arranged along the connection between the side wall and the bottom of the box body 1 to strengthen the connection between the inner wall and the bottom of the box body 1 and improve the rigidity of the box body 1.

[0042] In another technical solution, the upper and lower ends of the outer sides of the corrugated sheets 2 on the same side wall of the box body 1 are respectively provided with second transverse reinforcing ribs 22 to improve the rigidity of the corrugated sheets 2 and to prevent the reinforcing ribs 22 from adversely affecting the air circulation between the side walls of the corrugated sheets 2 and not affecting the heat dissipation efficiency of the side walls of the corrugated sheets.

[0043] In another technical solution, the box 1 further includes:

[0044] The second vertical reinforcing rib 15 is arranged between the bent portion 11 and the outer wall of the box body 1. The bent portion 11 is connected to the box cover 3. When the insulating oil in the box body 1 heats up and the pressure in the box increases, the box cover 3 will give a large tensile stress to the bent portion 11. The second vertical reinforcing rib 15 can strengthen the connection between the bent portion 11 and the box body 1, thereby improving the pressure resistance of the oil tank.

[0045] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. The transformer corrugated oil tank pressure-resistant structure is characterized by: include: The box body (1) has a bent portion (11) at its upper end facing outward; A corrugated sheet (2) is arranged on the outer wall of the box body (1) and is connected to the interior of the box body (1). An expansion strip (21) extending along its height direction and protruding is arranged on the upper side of the corrugated sheet (2).

2. The transformer corrugated oil tank pressure-resistant structure according to claim 1 is characterized in that: The expansion strip (21) has a semicircular cross section, and the bottom of the outer side wall of the expansion strip (21) is aligned with the outer side wall of the corrugated sheet (2).

3. The transformer corrugated oil tank pressure-resistant structure according to claim 1, characterized in that: The box (1) also includes: A triangular steel (12) is arranged from top to bottom in a close fit at the connection between adjacent inner side walls of the box body (1); The first transverse reinforcing rib (13) has two ends connected to the adjacent triangular steels (12) respectively, and a middle portion connected to the inner wall of the box body (1).

4. The transformer corrugated oil tank pressure-resistant structure according to claim 1, characterized in that: The box (1) also includes: A first vertical reinforcing rib (14) is arranged between the inner side wall and the bottom of the box body (1).

5. The transformer corrugated oil tank pressure-resistant structure according to claim 1, characterized in that: Second transverse reinforcing ribs (22) are respectively provided at the upper end and the lower end of the outer side of the corrugated sheet (2) on the same side wall of the box body (1).

6. The transformer corrugated oil tank pressure-resistant structure according to claim 1, characterized in that: The box (1) also includes: A second vertical reinforcing rib (15) is arranged between the bent portion (11) and the outer side wall of the box body (1).

Images