Tank bottom structure of transformer oil tank, and method for fitting tank bottom structure to transformer body

Abstract

The present invention relates to a tank bottom structure of a transformer oil tank, and a method for fitting the tank bottom structure to a transformer body. The tank bottom structure comprises an oil tank, wherein a transformer body is placed in the oil tank; reinforcement assemblies are fitted on the bottom surface of a tank bottom plate of the oil tank; large spaces are formed in the reinforcement assemblies, and support feet on the bottom surface of the transformer body penetrate downward through the tank bottom plate and are then accommodated and supported in the large spaces; small spaces are further formed in the reinforcement assemblies, positioning steel rings having upward openings are fitted in the small spaces, and positioning columns on the bottom surface of the transformer body penetrate downward through the tank bottom plate and are then fitted in the positioning steel rings; and transformer oil is stored in the large spaces and the small spaces. The reinforcement assemblies are mounted on the bottom surface of the tank bottom plate of a transformer, and the support feet and the positioning columns on the bottom surface of the transformer body penetrate through the tank bottom plate and are then fitted into the reinforcement assemblies. Thus, while ensuring the structural strength of the oil tank, the internal control height of the oil tank is effectively reduced, the use amount and weight of the transformer oil are also reduced, and the effective space utilization rate of the oil tank is greatly increased; in particular, the oil tank can be easily directly welded to a pre-embedded steel plate in a foundation after the oil tank is mounted in place on site.

Description

A transformer oil tank bottom structure and its assembly method with the transformer body Technical Field

[0001] The present invention relates to the technical field of transformers, in particular to a transformer oil tank bottom structure and an assembly method thereof with a transformer body. Background Art

[0002] The transformer core and coils together form the transformer body. In existing technology, the bottom of the transformer body rests on the fuel tank floor via feet. Due to the placement of the feet and other accessories, there is typically a gap of 120-170mm between the bottom of the transformer body and the tank floor. This gap is used to weld the bottom reinforcement ribs to the inside of the tank floor. Furthermore, the positioning bowl at the bottom of the transformer body is also welded directly to the tank floor.

[0003] For a State Grid 180MVA / 220kV transformer with conventional impedance, assuming a 120mm gap between the transformer body and the bottom, approximately 1.8 tons of transformer oil can be injected, equivalent to approximately RMB 16,000. The larger the capacity and the higher the voltage level, the greater the amount of oil required to fill the gap between the transformer body and the bottom. The capacity of the transformer oil conservator is designed to hold 10% of the transformer's oil volume. The greater the transformer's oil volume, the larger the required conservator volume.

[0004] Typically, after the transformer is installed on site, the tank bottom plate is placed directly onto the pre-embedded steel plate in the foundation and welded to it. However, more and more users are now requesting that the base be welded to the outside of the tank bottom. This is to enhance the strength of the tank bottom and prevent deformation. Furthermore, they hope that after the transformer is installed on site, the base can be directly welded to the pre-embedded steel plate in the foundation to avoid any adverse effects on the tank interior during welding of the tank bottom plate and the pre-embedded steel plate.

[0005] In the current transformer industry, competition among power transformer manufacturers is extremely fierce. How to reduce costs as much as possible while meeting the various performance parameters of the transformer to improve the company's competitiveness is what all transformer manufacturers are trying to do.

[0006] Summary of the Invention

[0007] To solve the above problems, the present invention provides a rationally structured transformer oil tank bottom structure and its assembly method with the transformer body, thereby effectively reducing the internal control height of the oil tank while ensuring the structural strength of the oil tank, reducing the amount and weight of transformer oil, greatly improving the effective space utilization rate in the oil tank, and effectively reducing costs.

[0008] The technical solutions adopted in the present invention are as follows:

[0009] A transformer oil tank bottom structure comprises an oil tank, wherein a transformer body is placed in the oil tank, and the bottom surface of the oil tank bottom plate is equipped with a reinforcement assembly, and the oil tank is supported on an external object by the reinforcement assembly; a large space is formed in the reinforcement assembly, and pads on the bottom surface of the transformer body are downwardly passed through the tank bottom plate and then accommodated and supported in the large space; a small space is also formed in the reinforcement assembly, and a positioning steel ring with an upward opening is equipped in the small space, and a positioning column on the bottom surface of the transformer body is downwardly passed through the tank bottom plate and then fitted in the positioning steel ring; transformer oil is stored in the large space and the small space.

[0010] As a further improvement of the above technical solution:

[0011] The pads are arranged at intervals along the length direction of the bottom surface of the device body, the number of reinforcement components corresponds to the number of pads on the bottom surface of the device body, and the total area of ​​multiple groups of reinforcement components in the horizontal plane is smaller than the area of ​​the box bottom plate in the horizontal plane.

[0012] Positioning columns are arranged on the bottom surface of the device body inside the two outermost sets of foot pads. The positioning columns are arranged at the four corners of the bottom surface of the device body. Small spaces for installing each positioning column are provided in the two outermost sets of reinforcement components.

[0013] The structure of a single set of reinforcement components is: it includes longitudinal plates and transverse plates welded to the bottom surface of the box bottom plate, and the bottom ends of the longitudinal plates and transverse plates are jointly equipped with bottom flat plates to form a horizontally arranged frame structure; the two adjacent longitudinal plates and the two adjacent transverse plates are enclosed to form a large space.

[0014] Horizontal support boards are installed between adjacent longitudinal boards located on the outside of the front and rear sides of the large space. The small space is a square space formed by adjacent longitudinal boards combined with horizontal boards and horizontal support boards.

[0015] In the left and right width directions of the tank bottom plate, the size of the tank bottom plate is consistent with the size of the reinforcement component; the large space is located in the middle of the width direction of the fuel tank.

[0016] The bottom surface of the large space is covered with cardboard, and the top surface of the cardboard is provided with a rubber pad, and the edge of the rubber pad is indented into the edge of the cardboard; the bottom surface of the pad is wrapped with an insulating paper groove, and the outer bottom surface of the insulating paper groove is in contact with the top surface of the rubber pad.

[0017] An axially penetrating positioning steel ring is welded on the bottom surface of the small space, and a second rubber pad is installed on the surface of the small space inside the positioning steel ring. A positioning wooden bowl with an upward opening is installed in the positioning steel ring above the second rubber pad. The top of the positioning wooden bowl extends outward in the circumferential direction to form a folded edge, and the folded edge is located above the top of the positioning steel ring; the positioning column is inserted into the interior of the positioning wooden bowl, and the space between the circumferential outside of the positioning column and the inner wall of the positioning wooden bowl is filled with solidified epoxy glue.

[0018] All large spaces and small spaces are interconnected through connecting holes and connecting pipes. The heights of the connecting holes and connecting pipes correspond to the heights of the bottom surfaces of the large spaces and small spaces. The ends of the connecting pipes are equipped with valves after passing through the reinforcement components.

[0019] A method for assembling the transformer oil tank bottom structure and the transformer body includes the following steps:

[0020] Use a high-power vacuum cleaner to clean the bottom of the fuel tank, including the large and small spaces connected to the internal space of the fuel tank;

[0021] An insulating cardboard is placed on the bottom of the large space, and a shock-absorbing rubber pad is placed on the cardboard, with the circumferential edge of the rubber pad indented relative to the circumferential edge of the cardboard;

[0022] Place a second shock-absorbing rubber pad on the inner bottom surface of the positioning steel ring in the small space, and install a positioning wooden bowl filled with liquid epoxy glue on the positioning steel ring;

[0023] Lift the transformer body, wrap the insulating paper slots on the bottom of the footrest with cloth tape, and then lift the transformer body into the oil tank;

[0024] The foot pad wrapped with the insulating paper groove is placed on the rubber pad in the large space, and the positioning column on the bottom of the device body is inserted into the epoxy glue in the positioning wooden bowl. The epoxy glue solidifies so that the device body and the positioning wooden bowl become one.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention has a compact and reasonable structure and an ingenious design. By installing a reinforcement component on the bottom surface of the transformer box bottom plate, and passing the pads and positioning columns on the bottom surface of the transformer body through the box bottom plate and then fitting them into the reinforcement component, the structural strength of the oil tank is ensured while effectively reducing the internal control height of the oil tank, reducing the amount and weight of transformer oil, and greatly improving the effective space utilization rate in the oil tank. It is particularly convenient for the oil tank to be directly welded to the pre-buried steel plate of the foundation after it is in place on site.

[0027] The present invention also includes the following advantages:

[0028] The present invention lowers the height of the oil tank by sinking the transformer body relative to the bottom of the oil tank, greatly reducing the distance between the bottom surface of the transformer body and the bottom surface of the oil tank from a typical distance of more than 120 mm to a theoretical distance of no contact, effectively reducing the amount of transformer oil used without affecting the actual performance of the transformer.

[0029] Calculations show that for State Grid's 180MVA / 220kV conventional impedance transformers, each can save 1.6 tons of transformer oil, equivalent to approximately RMB 15,000; for high-impedance transformers, due to the larger oil tank size, more oil can be saved, and each can save approximately RMB 21,000. The larger the transformer capacity and the higher the voltage level, the greater the savings.

[0030] The reduction in transformer oil volume also reduces the volume of the transformer oil pillow and oil storage cabinet corresponding to the oil volume, effectively reducing production costs.

[0031] In the present invention, the bottom plate and base of the transformer oil tank are improved and designed. Holes are opened in the bottom plate at positions corresponding to the pads and the positioning columns of the device body, and the bottom reinforcement ribs on the inner side of the oil tank are eliminated. Instead, the base space on the outer bottom surface of the bottom plate is utilized to embed the pads and the positioning columns into the large space and small space of the base reinforcement component respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic structural diagram of the present invention.

[0033] FIG2 is a partial enlarged view of point A in FIG1 .

[0034] FIG3 is a side view of FIG1 .

[0035] FIG4 is a schematic diagram of the assembly of the reinforcement assembly on the bottom plate of the fuel tank of the present invention.

[0036] FIG5 is a schematic diagram showing the state of the device body of the present invention when it is assembled to the fuel tank bottom plate reinforcement assembly.

[0037] Among them: 1. Body; 2. Fuel tank; 3. Tank bottom plate; 4. Reinforcement components; 5. Connecting pipe; 6. Large space; 7. Small space;

[0038] 11. Foot pad; 12. Positioning column;

[0039] 40. Connecting hole; 41. Longitudinal plate; 42. Transverse plate; 43. Transverse support plate; 44. Bottom plate;

[0040] 51. Valve;

[0041] 61. Cardboard; 62. Rubber pad 1; 63. Insulation paper slot;

[0042] 70. Support block; 71. Second rubber pad; 72. Positioning wooden bowl; 73. Epoxy glue; 74. Positioning steel ring. DETAILED DESCRIPTION

[0043] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0044] As shown in Figures 1, 2 and 3, a transformer oil tank bottom structure of this embodiment includes an oil tank 2, in which a transformer body 1 is placed. The bottom surface of the bottom plate 3 of the oil tank 2 is equipped with a reinforcement component 4, and the oil tank 2 is supported on an external object by the reinforcement component 4, such as being welded to an external foundation embedded steel plate; a large space 6 is formed in the reinforcement component 4, and the pads 11 on the bottom surface of the body 1 pass downward through the bottom plate 3 and are accommodated and supported in the large space 6; a small space 7 is also formed in the reinforcement component 4, and a positioning steel ring 74 with an upward opening is installed in the small space 7, and the positioning column 12 on the bottom surface of the body 1 passes downward through the bottom plate 3 and is equipped in the positioning steel ring 74; transformer oil is stored in the large space 6 and the small space 7.

[0045] In this embodiment, by installing a reinforcement component 4 on the bottom surface of the transformer box bottom plate 3, and passing the pads 11 and positioning columns 12 on the bottom surface of the body 1 through the box bottom plate 3 and then fitting into the reinforcement component 4, while ensuring the structural strength of the oil tank 2, the internal control height of the oil tank 2 is effectively reduced, the amount and weight of transformer oil are reduced, and it is particularly convenient for the oil tank 2 to be directly welded to the pre-buried steel plate of the foundation after it is in place on site.

[0046] In this embodiment, based on the existing transformer structure, the bottom plate 3 and the base of the transformer oil tank 2 are improved and designed, holes are opened in the bottom plate 3 at the positions corresponding to the pads 11 and the positioning columns 12 of the device body 1, and the bottom reinforcement ribs on the inner side of the oil tank 2 are eliminated. Instead, the base space on the outer bottom surface of the bottom plate 3 is used to arrange the reinforcement components, and the pads 11 and the positioning columns 12 are respectively embedded in the large space 6 and the small space 7 of the base reinforcement component 4, so that the device body 1 is sunken relative to the oil tank 2. The design is ingenious, the overall changes are small, and it is easy to implement and operate.

[0047] As shown in Figure 4, the pads 11 are arranged at intervals along the length direction of the bottom surface of the body 1, the number of reinforcement components 4 corresponds one to one with the number of pads 11 on the bottom surface of the body 1, and the total area of ​​multiple groups of reinforcement components 4 in the horizontal plane is smaller than the area of ​​the box bottom plate 3 in the horizontal plane.

[0048] In this embodiment, a single foot 11 is arranged along the width direction of the body 1 , and the cross section of the single foot 11 is a U-shaped structure with the opening facing upward.

[0049] In this embodiment, the reinforcement components 4 are arranged in a one-to-one correspondence with the pads 11, fully utilizing the function of the reinforcement components 4. While strengthening the structural strength of the tank bottom plate 3 of the fuel tank 2, it can also be used to lower the pads 11. Of course, according to actual needs, the number of reinforcement components 4 can be greater than the number of pads 11, or the area of ​​the reinforcement components 4 can be appropriately expanded at certain locations to accommodate the use of two adjacent sets of pads 11, especially when the two sets of pads 11 are close to each other.

[0050] Positioning posts 12 are arranged on the bottom surface of the body 1 inside the two outermost groups of foot pads 11. The positioning posts 12 are arranged at the four corners of the bottom surface of the body 1. Small spaces 7 for each positioning post 12 to be installed are provided in the two outermost groups of reinforcement components 4.

[0051] For existing transformers, four positioning posts 12 are usually arranged in a matrix at the four corners of the bottom surface of the body 1. Of course, for a transformer body 1 with a larger length, six or eight positioning posts 12 may also be set; corresponding small spaces 7 can be set in the corresponding reinforcement components 4.

[0052] The structure of a single group of reinforcement components 4 is as follows: it includes a longitudinal plate 41 and a transverse plate 42 welded to the bottom surface of the box bottom plate 3, and the bottom ends of the longitudinal plate 41 and the transverse plate 42 are jointly equipped with a bottom flat plate 44 to form a horizontally arranged frame structure; wherein the two adjacent longitudinal plates 41 and the two adjacent transverse plates 42 enclose a large space 6, forming an enclosed space that is as small as possible suitable for the pad 11; thereby, while strengthening the structural strength of the fuel tank 2 through the reinforcement component 4, the sinking use of the pad 11 is realized.

[0053] A transverse support plate 43 is installed between adjacent longitudinal plates 41 located on the front and rear sides of the large space 6. The small space 7 is a square space formed by adjacent longitudinal plates 41, transverse plates 42 and transverse support plates 43.

[0054] In this embodiment, the provision of the transverse support plate 43 effectively ensures the overall structural strength, especially the structural strength of the large space 6. In addition, the transverse support plate 43 is cleverly used to form the small space 7, forming an enclosed space that is as small as possible and suitable for the positioning column 12.

[0055] In this embodiment, the small space 7 and the large space 6 are provided to form a closed space as small as possible suitable for the positioning column 12 and the foot 11 respectively, which effectively reduces the amount of transformer oil at the bottom of the box while meeting the use requirements.

[0056] The welding lines between the reinforcement component 4 and the bottom plate 3 of the fuel tank 2, and between the plates inside the reinforcement component 4 should be full, smooth and continuous, especially the welding lines around the large space 6 and the small space 7. There should be no welding slag in the welds. After sandblasting and painting the fuel tank 2, the welding lines around the large space 6 and the small space 7 also need to be leak tested.

[0057] In the left and right width directions of the tank bottom plate 3, the size of the tank bottom plate 3 is consistent with the size of the reinforcement component 4, effectively ensuring that the reinforcement component 4 provides reliable and stable reinforcement of the fuel tank 2 structure; the large space 6 is located in the middle of the fuel tank 2 in the width direction.

[0058] The bottom surface of the large space 6 is covered with cardboard 61, and the top surface of the cardboard 61 is provided with a rubber pad 62, the circumferential edge of the rubber pad 62 is indented into the edge of the cardboard 61; the bottom surface of the pad 11 is wrapped with an insulating paper groove 63, and the outer bottom surface of the insulating paper groove 63 is in contact with the top surface of the rubber pad 62.

[0059] An axially penetrating positioning steel ring 74 is welded on the inner bottom surface of the small space 7, and a rubber pad 71 is installed on the inner surface of the small space 7 inside the positioning steel ring 74. A positioning wooden bowl 72 with an upward opening is installed in the positioning steel ring 74 above the rubber pad 71. The top of the positioning wooden bowl 72 extends outward in the circumferential direction to form a folded edge, and the folded edge is located above the top of the positioning steel ring 74; the positioning column 12 is inserted into the interior of the positioning wooden bowl 72, and the space between the circumferential outside of the positioning column 12 and the inner wall of the positioning wooden bowl 72 is filled with solidified epoxy glue 73.

[0060] In this embodiment, a support block 70 is connected between the outer wall surface of the positioning steel ring 74 and the inner wall surface of the small space 7, which effectively ensures the structural strength of the positioning steel ring 74 at the location where it is assembled with the positioning column 12.

[0061] All large spaces 6 and small spaces 7 are connected to each other through connecting holes 40 and connecting pipes 5. The heights of the connecting holes 40 and connecting pipes 5 correspond to the heights of the inner bottom surfaces of the large spaces 6 and small spaces 7. The end of the connecting pipe 5 is equipped with a valve 51 after passing through the reinforcement component 4 to facilitate the discharge of transformer oil.

[0062] In this embodiment, when the large space 6 and the small space 7 are adjacent, the oil can be communicated by opening holes on the adjacent walls; for the non-adjacent large spaces 6 and small spaces 7, the oil chambers are communicated by setting a connecting pipe 5, and finally the oil is led to the outside of the oil tank 2 through the valve 51.

[0063] The valve 51 in this embodiment can be switched to an oil drain plug according to actual needs, which can also meet the needs of use.

[0064] In this embodiment, a hole is opened at a corresponding position of the bottom plate 3 of the oil tank 2, and a closed space is formed around the hole with a steel plate to form a reinforcement component 4. Only the large space 6 and the small space 7 corresponding to the hole are connected to the interior of the oil tank 2, ensuring that no excess transformer oil except the pads 11 and the positioning columns 12 will enter the reinforcement component 4, thereby further reducing the overall oil usage while ensuring the performance of the transformer.

[0065] The present invention lowers the internal control height of the oil tank 2 by sinking the transformer body 1 relative to the bottom of the oil tank 2, thereby greatly reducing the distance between the bottom surface of the transformer body 1 and the inner bottom surface of the oil tank 2 from a distance usually greater than 120 mm to a theoretical distance of no contact, thereby effectively reducing the amount of transformer oil used without affecting the actual performance of the transformer.

[0066] Calculations show that for State Grid's 180MVA / 220kV conventional impedance transformers, each can save 1.6 tons of transformer oil, equivalent to approximately RMB 15,000; for high-impedance transformers, due to the larger oil tank size, more oil can be saved, and each can save approximately RMB 21,000. The larger the transformer capacity and the higher the voltage level, the greater the savings.

[0067] The reduction in transformer oil volume also reduces the volume of the transformer oil pillow and oil storage cabinet corresponding to the oil volume, effectively reducing production costs.

[0068] The assembly method of the transformer oil tank bottom structure and the transformer body of this embodiment includes the following steps:

[0069] Step 1: Use a high-power vacuum cleaner to clean the bottom of the fuel tank 2, including cleaning the large space 6 and the small space 7 that are connected to the internal space of the fuel tank 2, so as to prevent fiber lint and other impurities from being hidden in the large space 6 and the small space 7 at the bottom of the tank;

[0070] Step 2: Place an insulating cardboard 61 on the bottom of the large space 6, and place a shock-absorbing rubber pad 62 on the cardboard 61, with the circumferential edge of the rubber pad 62 indented relative to the circumferential edge of the cardboard 61;

[0071] In this embodiment, a 2 mm thick dry insulating cardboard 61 can be used. When the rubber pad 62 is placed, its length and width are smaller than the cardboard 61 to ensure the overall insulation performance, especially the reliable insulation between the transformer body 1 structural parts and the oil tank 2.

[0072] Step 3: Place a second shock-absorbing rubber pad 71 on the inner bottom surface of the positioning steel ring 74 in the small space 7, and fit the positioning wooden bowl 72 filled with liquid epoxy glue 73 onto the positioning steel ring 74;

[0073] Step 4: Lift the transformer body 1, secure the insulating paper trough 63 to the bottom of the foot 11 with cloth tape, and then hoist the transformer body 1 into the oil tank 2. The insulating paper trough 63 and cardboard 61 provide a double barrier for insulation between the transformer body 1 and the oil tank 2. Rubber pad 1 62 reduces vibration-induced noise during transformer operation. Both sides of rubber pad 1 62 can be granular to ensure good anti-slip and shock-absorbing properties.

[0074] Step 5: As shown in Figure 5, the foot 11 wrapped with the insulating paper groove 63 falls and is fitted onto the rubber pad 62 in the large space 6. The positioning column 12 on the bottom surface of the body 1 is inserted into the epoxy glue 73 in the positioning wooden bowl 72. The epoxy glue 73 solidifies, making the body 1 and the positioning wooden bowl 72 become one.

[0075] The present invention has an ingenious structure. While ensuring the structural strength of the oil tank, it effectively reduces the internal control height of the oil tank, reduces the amount and weight of transformer oil, and greatly improves the effective space utilization rate in the oil tank. It is particularly convenient for the oil tank to be directly welded to the pre-buried steel plate of the foundation after it is in place on site.

[0076] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0077] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. A transformer oil tank bottom structure, comprising an oil tank (2), wherein a transformer body (1) is placed in the oil tank (2), characterized in that: The bottom surface of the bottom plate (3) of the oil tank (2) is equipped with a reinforcing assembly (4), and the oil tank (2) is supported on an external object by the reinforcing assembly (4); a large space (6) is formed in the reinforcing assembly (4), and a pad (11) on the bottom surface of the device body (1) passes downward through the bottom plate (3) and is accommodated and supported in the large space (6); a small space (7) is also formed in the reinforcing assembly (4), and a positioning steel ring (74) with an opening facing upward is installed in the small space (7), and a positioning column (12) on the bottom surface of the device body (1) passes downward through the bottom plate (3) and is installed in the positioning steel ring (74); transformer oil is stored in the large space (6) and the small space (7).

2. A transformer oil tank bottom structure as claimed in claim 1, characterized in that: The padding feet (11) are arranged at intervals along the length direction of the bottom surface of the body (1); the number of the reinforcing components (4) corresponds to the number of the padding feet (11) on the bottom surface of the body (1); and the total area of ​​the plurality of groups of reinforcing components (4) in the horizontal plane is smaller than the area of ​​the box bottom plate (3) in the horizontal plane.

3. A transformer oil tank bottom structure as claimed in claim 2, characterized in that: The bottom surface of the body (1) is provided with positioning posts (12) inside the two outermost groups of foot pads (11). The positioning posts (12) are arranged at four corners of the bottom surface of the body (1). The two outermost groups of reinforcement components (4) are provided with small spaces (7) for the positioning posts (12) to be respectively installed.

4. A transformer oil tank bottom structure as claimed in claim 2, characterized in that: The structure of a single group of reinforcement components (4) is as follows: it includes a longitudinal plate (41) and a transverse plate (42) welded to the bottom surface of the box bottom plate (3), and the bottom ends of the longitudinal plate (41) and the transverse plate (42) are jointly equipped with a bottom plate (44) to form a horizontally arranged frame structure; wherein two adjacent longitudinal plates (41) and two adjacent transverse plates (42) are surrounded to form a large space (6).

5. A transformer oil tank bottom structure as claimed in claim 4, characterized in that: A transverse support plate (43) is installed between adjacent longitudinal plates (41) located outside the front and rear sides of the large space (6). The small space (7) is a square space formed by the adjacent longitudinal plates (41) combined with the transverse plates (42) and the transverse support plates (43).

6. A transformer oil tank bottom structure according to claim 1, characterized in that: In the left and right width directions of the tank bottom plate (3), the size of the tank bottom plate (3) is consistent with the size of the reinforcement component (4); the large space (6) is located in the middle of the width direction of the oil tank (2).

7. The transformer oil tank bottom structure according to claim 1, characterized in that: The inner bottom surface of the large space (6) is paved with a cardboard (61), the top surface of the cardboard (61) is provided with a rubber pad (62), and the circumferential edge of the rubber pad (62) is indented from the edge of the cardboard (61); the bottom surface of the pad (11) is wrapped with an insulating paper groove (63), and the outer bottom surface of the insulating paper groove (63) is in contact with the top surface of the rubber pad (62).

8. The transformer oil tank bottom structure according to claim 1, characterized in that: An axially penetrating positioning steel ring (74) is welded on the inner bottom surface of the small space (7); a second rubber pad (71) is arranged on the inner surface of the small space (7) located inside the positioning steel ring (74); a positioning wooden bowl (72) with an opening facing upward is arranged in the positioning steel ring (74) above the second rubber pad (71); the top of the positioning wooden bowl (72) extends outward in the circumferential direction to form a folded edge, and the folded edge is located above the top of the positioning steel ring (74); the positioning column (12) is inserted into the interior of the positioning wooden bowl (72); and the space between the circumferential outer portion of the positioning column (12) and the inner wall surface of the positioning wooden bowl (72) is filled with solidified epoxy glue (73).

9. The transformer oil tank bottom structure according to claim 1, characterized in that: All the large spaces (6) and small spaces (7) are interconnected via the connecting holes (40) and the connecting pipes (5); the heights of the connecting holes (40) and the connecting pipes (5) correspond to the heights of the inner bottom surfaces of the large spaces (6) and the small spaces (7); and the ends of the connecting pipes (5) are provided with valves (51) after passing through the reinforcing assembly (4).

10. A method of assembling the transformer oil tank bottom structure and the transformer body according to claim 1, characterized in that: The steps include: A high-power vacuum cleaner is used to clean the bottom of the oil tank (2), including cleaning the large space (6) and the small space (7) that are connected to the internal space of the oil tank (2); An insulating cardboard (61) is placed on the bottom surface of the large space (6), and a shock-absorbing rubber pad (62) is placed on the cardboard (61), with the circumferential edge of the rubber pad (62) being indented relative to the circumferential edge of the cardboard (61); A second shock-absorbing rubber pad (71) is laid on the inner bottom surface of the positioning steel ring (74) in the small space (7), and a positioning wooden bowl (72) containing liquid epoxy glue (73) is mounted on the positioning steel ring (74); The transformer body (1) is hoisted, the insulating paper groove (63) is fixedly wrapped with a cloth tape on the bottom surface of the foot pad (11), and the transformer body (1) is hoisted and placed in the oil tank (2); The foot pad (11) wrapped with the insulating paper groove (63) is dropped and fitted onto the rubber pad (62) in the large space (6), and the positioning column (12) on the bottom surface of the body (1) is inserted into the epoxy glue (73) in the positioning wooden bowl (72). The epoxy glue (73) solidifies so that the body (1) and the positioning wooden bowl (72) become one body.

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