A transformer oil tank, oil-immersed transformer

Abstract

The application provides a transformer oil tank and an oil-immersed transformer, and relates to the field of transformers. The upper surface of the oil tank bottom plate of the transformer oil tank is covered with a rubber pad, and a plurality of fasteners penetrate the rubber pad in the vertical direction and extend into the interior of the oil tank bottom plate to fix the two. The oil tank bottom plate is composed of a heat dissipation member, and the edge of the oil tank bottom plate is formed with a heat dissipation channel in a direction parallel to the horizontal plane, so that the oil tank bottom plate has a partial hollow structure. This structure is beneficial to dissipating the heat accumulated at the oil tank bottom plate, thereby reducing the local hardening and cracking of the rubber pad caused by high temperature and enhancing the buffering and sealing performance of the rubber pad.

Description

Technical Field

[0001] This application relates to the field of transformers, and more particularly to a transformer tank and an oil-immersed transformer. Background Technology

[0002] For oil-immersed transformers, one improvement approach is to cover the tank bottom plate with a rubber pad. Because the rubber pad can absorb electromagnetic vibrations, during transformer operation, the core and windings generate high-frequency micro-vibrations due to the alternating magnetic field. The rubber pad can absorb this vibrational energy, preventing direct transmission of vibration to the tank bottom plate or foundation, thus reducing structural fatigue and noise. Furthermore, rubber itself is an insulating material, preventing leakage current paths between the tank and grounding supports, reducing the risk of partial discharge or electrochemical corrosion. In addition, the rubber pad enhances the oil leakage resistance of the tank bottom plate, making it particularly suitable for bolted connections.

[0003] After prolonged operation, the rubber gaskets inside existing transformer tanks are prone to localized overheating and aging due to increased oil temperature, leading to localized hardening and cracking, which in turn reduces the buffering and sealing performance of the rubber gaskets. Utility Model Content

[0004] The rubber gaskets inside existing transformer oil tanks are prone to aging due to localized overheating caused by rising oil temperature after prolonged operation, leading to localized hardening and cracking, which in turn reduces the cushioning and sealing performance of the rubber gaskets. To overcome the shortcomings of the prior art, this application provides a transformer oil tank.

[0005] A transformer tank has a cavity for holding a transformer and an evaporative cooling medium. The upper surface of the tank bottom plate is covered with a rubber pad, and several fasteners penetrate the rubber pad vertically and extend into the tank bottom plate to fix the two. The tank bottom plate is composed of heat dissipation components, and the edge of the tank bottom plate is penetrated in a direction parallel to the horizontal plane to form a heat dissipation channel, making the tank bottom plate partially hollow.

[0006] In one possible implementation, the fuel tank bottom plate includes a first heat dissipation plate and a second heat dissipation plate stacked and fixed together along the horizontal plane. The opposing surfaces of the first heat dissipation plate and the second heat dissipation plate are recessed to form a plurality of first heat dissipation grooves and a plurality of second heat dissipation grooves, respectively. Both ends of the first heat dissipation grooves and the second heat dissipation grooves penetrate the fuel tank bottom plate.

[0007] In one possible implementation, the projections of the first heat dissipation groove and the second heat dissipation groove in the vertical direction are staggered.

[0008] In one possible implementation, the first heat sink is stacked on top of the second heat sink, and the first heat sink groove and the second heat sink groove are configured with at least one of the following structures: First structure: The depth of the first heat dissipation groove is greater than the depth of the second heat dissipation groove; In the second structure, the width of the first heat dissipation groove is greater than the width of the second heat dissipation groove.

[0009] In one possible implementation, the fastener is a bolt, the bolt head of which is pressed against the upper surface of a rubber pad by a cushioning element capable of elastic deformation.

[0010] In one possible implementation, the upper and / or lower surfaces of the rubber pad are coated with thermally conductive silicone grease.

[0011] In one possible implementation, a plurality of support blocks are fixedly connected to the bottom plate of the oil tank, which surround the mounting position of the transformer body. The side of the support block facing the mounting position has a plurality of stepped portions adapted to the steel sheets of the transformer body.

[0012] In one possible implementation, a plurality of support blocks are fixedly attached to the bottom plate of the oil tank, which surround the mounting position of the transformer body. A first limiting plate is fixedly attached to the side of the support block facing away from the mounting position. The bottom of the first limiting plate is fixedly attached to the bottom plate of the oil tank. A second limiting plate is connected to the side of the first limiting plate facing the mounting position. The second limiting plate is configured to fit against the side of the transformer body through an elastic body to limit its movement.

[0013] This application also provides an oil-immersed transformer, including the above-described transformer tank and transformer body, wherein the transformer body is fixedly installed in the receiving cavity that contains the evaporative cooling medium.

[0014] In one possible implementation, the transformer includes a heat exchanger with its fluid outlet connected to the heat dissipation channel.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: This application provides a transformer oil tank, wherein the upper surface of the bottom plate of the transformer oil tank is covered with a rubber pad, and several fasteners penetrate the rubber pad vertically and extend into the interior of the bottom plate to fix the two; the bottom plate of the oil tank is composed of a heat dissipation component, and the edge of the bottom plate is penetrated in a direction parallel to the horizontal plane to form a heat dissipation channel, making the bottom plate of the oil tank partially hollow. By setting the heat dissipation channel, the heat exchange area between the bottom plate of the oil tank and the air is increased, and since the heat dissipation channel penetrates the bottom plate of the oil tank to form an open opening in contact with the air, air or coolant can flow in from one end of the heat dissipation channel and flow out from the other end, thereby penetrating the entire heat dissipation channel, carrying away the heat accumulated at the bottom plate of the oil tank, thereby reducing the local hardening and cracking of the rubber pad caused by high temperature, and enhancing the buffering and sealing performance of the rubber pad. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a transformer oil tank is shown; Figure 2 A partial cross-sectional view of the bottom plate of the fuel tank is shown.

[0018] Explanation of key component symbols: 100-Fuel tank bottom plate; 110-Heat dissipation channel; 120-First heat dissipation plate; 121-First heat dissipation groove; 130-Second heat dissipation plate; 131-Second heat dissipation groove; 200-Rubber pad; 210-Thermal conductive silicone grease; 300-Fastener; 310-Silicone gasket; 320-Metal spring washer; 400-Support block; 410-Step portion; 500-First limiting plate; 600-Second limiting plate. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] Example 1 For oil-immersed transformers, one improvement approach is to cover the tank bottom plate with a rubber pad. Because the rubber pad can absorb electromagnetic vibrations, during transformer operation, the core and windings generate high-frequency micro-vibrations due to the alternating magnetic field. The rubber pad can absorb this vibrational energy, preventing direct transmission of vibration to the tank bottom plate or foundation, thus reducing structural fatigue and noise. Furthermore, rubber itself is an insulating material, preventing leakage current paths between the tank and grounding supports, reducing the risk of partial discharge or electrochemical corrosion. In addition, the rubber pad enhances the oil leakage resistance of the tank bottom plate, making it particularly suitable for bolted connections.

[0021] After prolonged operation, the rubber gaskets inside existing transformer tanks are prone to localized overheating and aging due to increased oil temperature, leading to localized hardening and cracking, which in turn reduces the buffering and sealing performance of the rubber gaskets.

[0022] To address the problem of rubber pad aging caused by increased oil temperature in existing technologies, this application provides a transformer oil tank. By rationally designing a heat dissipation structure, air convection can be generated in the bottom plate of the oil tank to dissipate the heat accumulated at the bottom of the transformer oil tank and slow down the aging rate of the rubber pad.

[0023] Please see Figure 1 and Figure 2 This application provides a transformer tank with a cavity for holding a transformer and an evaporative cooling medium. The upper surface of the tank bottom plate 100 is covered with a rubber pad 200, and several fasteners 300 penetrate the rubber pad 200 vertically and extend into the tank bottom plate 100 to fix the two. The tank bottom plate 100 is composed of heat dissipation components, and the edge of the tank bottom plate 100 is penetrated in a direction parallel to the horizontal plane to form a heat dissipation channel 110, so that the tank bottom plate 100 forms a partially hollow structure.

[0024] Specifically, the transformer tank consists of a tank cover, a tank body, and a tank base plate 100, forming a containment cavity. The evaporative cooling medium can be evaporative coolant, mineral oil, or synthetic grease. The rubber pad 200 is made of neoprene rubber or fluororubber, which has excellent high-temperature resistance. The heat dissipation components are made of aluminum alloy because aluminum alloy has a high thermal conductivity, making it easier to dissipate heat. However, aluminum alloy has relatively low strength, so the width of the heat dissipation channel 110 should not be designed to be too large, and there are certain requirements for the thickness of the tank base plate 100. For example, the thickness of the tank base plate 100 can be designed between 40mm and 70mm, and the height of the hollow part is approximately 20% to 50% of the thickness of the tank base plate 100.

[0025] Understandably, the arrangement of the heat dissipation channel 110 increases the heat exchange area between the fuel tank bottom plate 100 and the air. Furthermore, since the heat dissipation channel 110 penetrates the fuel tank bottom plate 100 to form an open opening that contacts the air, air or coolant can flow in from one end of the heat dissipation channel 110 and flow out from the other end, thus penetrating the entire heat dissipation channel 110 and carrying away the heat accumulated at the fuel tank bottom plate 100. This reduces the local hardening and cracking of the rubber pad 200 caused by high temperature and increases the buffering and sealing performance of the rubber pad 200.

[0026] Please see Figure 2 In some embodiments, the fuel tank bottom plate 100 includes a first heat dissipation plate 120 and a second heat dissipation plate 130 stacked and fixed along the horizontal plane. The opposing surfaces of the first heat dissipation plate 120 and the second heat dissipation plate 130 are respectively recessed to form a plurality of first heat dissipation grooves 121 and a plurality of second heat dissipation grooves 131. Both ends of the first heat dissipation grooves 121 and the second heat dissipation grooves 131 penetrate the fuel tank bottom plate 100.

[0027] The opposing surfaces of the first heat sink 120 and the second heat sink 130 are concave in opposite directions; that is, the first heat sink 120, which is above, is concave upwards, and the second heat sink 130, which is below, is concave downwards. The first heat sink 120 and the second heat sink 130 can be fixedly connected by welding or bolts.

[0028] Designing the fuel tank bottom plate 100 as consisting of two heat dissipation plates helps reduce the production cost of the fuel tank bottom plate 100. It is understood that the processing cost of forming a channel through the side of a plate-like component is far greater than producing two plate-like components with grooves. Furthermore, in some preferred embodiments, the first heat dissipation plate 120 and the second heat dissipation plate 130 can be designed as standard parts of the same shape, further reducing production costs.

[0029] Please see Figure 2 In some embodiments, both the first heat dissipation groove 121 and the second heat dissipation groove 131 have rectangular cross-sections. This design is because the fuel tank bottom plate 100 is generally also a plate-shaped component. Setting the cross-section of the heat dissipation grooves to be rectangular helps to make the thickness of the fuel tank bottom plate 100 uniform.

[0030] In some embodiments, the projections of the first heat dissipation groove 121 and the second heat dissipation groove 131 in the vertical direction are staggered. The staggered arrangement of the first heat dissipation groove 121 and the second heat dissipation groove 131 facilitates heat dissipation from different angles by the fuel tank bottom plate 100; it also prevents a portion of the fuel tank bottom plate 100 from becoming too thin due to the heat dissipation grooves (if the first heat dissipation groove 121 and the second heat dissipation groove 131 coincide in the vertical direction, the hollow height at that point would be too high, affecting the load-bearing capacity of the fuel tank bottom plate 100), and helps to reduce the thickness of the fuel tank bottom plate 100. In some possible embodiments, the thickness of the fuel tank bottom plate 100 can be less than the sum of the depths of the first and second grooves, which helps to increase the overall specific surface area of ​​the fuel tank bottom plate 100 and improve its heat dissipation effect.

[0031] Please see Figure 2 In some embodiments, the first heat sink 120 is stacked on top of the second heat sink 130, and the first heat sink groove 121 and the second heat sink groove 131 are configured with at least one of the following structures: first structure: the recess depth of the first heat sink groove 121 is greater than the recess depth of the second heat sink groove 131; second structure: the recess width of the first heat sink groove 121 is greater than the recess width of the second heat sink groove 131.

[0032] It is understandable that the first heat dissipation groove 121 is closer to the receiving cavity, so it is easier to dissipate heat than the second heat dissipation groove 131. When the first structure or the second structure is adopted, the surface area of ​​the first heat dissipation groove 121 can be larger than the surface area of ​​the second heat dissipation groove 131, thereby giving it better heat dissipation performance while keeping the overall size of the fuel tank bottom plate 100 unchanged.

[0033] In some embodiments, the fastener 300 is a bolt, and the bolt head is pressed against the upper surface of the rubber pad 200 by a buffer member capable of elastic deformation. Specifically, the buffer member can be a silicone gasket 310 or a metal spring washer 320. The buffer member helps to disperse vibration energy, prevents the rubber pad 200 from cracking due to bolt vibration, and increases the service life of the rubber pad 200. In some preferred embodiments, a hole slightly smaller than the bolt diameter can be pre-drilled in the rubber pad 200 to reduce the initial stress during insertion.

[0034] In some embodiments, the upper and / or lower surfaces of the rubber pad 200 are coated with thermally conductive silicone grease 210. Applying thermally conductive silicone grease 210 to the upper surface of the rubber pad 200 helps to quickly conduct heat to the evaporative cooling medium, while applying thermally conductive silicone grease 210 to the lower surface of the rubber pad 200 helps to transfer heat to the tank bottom plate 100.

[0035] Please see Figure 1In some embodiments, a plurality of support blocks 400 are fixedly connected to the bottom plate 100 of the oil tank, which surround the mounting position of the transformer body. The side of the support block 400 facing the mounting position has a plurality of stepped portions 410 adapted to the steel sheets of the transformer body.

[0036] The support block 400 can be a wooden pad. It is understood that by setting several support blocks 400 to form an enclosed structure, multi-point positioning support for the transformer body can be achieved, limiting its horizontal displacement. The stepped portion 410 of the support block 400 facing the installation position matches the shape of the transformer steel sheets, ensuring surface contact rather than line contact between the support block 400 and the steel sheets, thus dispersing the pressure of the transformer weight on the tank bottom plate 100. Furthermore, the stepped design of the stepped portion 410 can accommodate the stacked structure of steel sheets of different thicknesses, avoiding gaps between the support block 400 and the transformer steel sheets that could lead to vibration transmission, thereby reducing the local impact load borne by the rubber pad 200. In summary, the enclosed structure formed by several support blocks 400 helps improve the stability of the transformer body installation and prevents excessive local deformation of the rubber pad 200 due to vibration, which could cause cracks.

[0037] Please see Figure 1 In some embodiments, a plurality of support blocks 400 are fixedly connected to the tank bottom plate 100, surrounding the mounting positions of the transformer body. A first limiting plate 500 is fixedly connected to the side of the support block 400 facing away from the mounting positions. The bottom of the first limiting plate 500 is fixedly connected to the tank bottom plate 100. A second limiting plate 600 is connected to the side of the first limiting plate 500 facing the mounting positions. The second limiting plate 600 is disposed to be fitted against the side of the transformer body by an elastic body to limit its movement. Both the first limiting plate 500 and the second limiting plate 600 can be made of stainless steel.

[0038] Several support blocks 400 provide basic support to distribute the load on the transformer body. A first limiting plate 500, located on the back side of the support blocks 400, is fixedly connected to the tank bottom plate 100, forming a rigid connection frame and enhancing the overall structural stability. The elastomer can be made of rubber, and it can absorb vibration energy through elastic deformation. The second limiting plate 600 is designed to fit the side of the transformer body, effectively restraining the horizontal displacement of the transformer body. Placing the elastomer between the second limiting plate 600 and the transformer body creates a secondary vibration damping barrier.

[0039] Example 2 This embodiment provides an oil-immersed transformer, including the transformer tank and transformer body as in Embodiment 1, with the transformer body fixedly installed in a receiving cavity that contains evaporative cooling medium.

[0040] It is understandable that, due to the use of the transformer tank in Embodiment 1, the oil-immersed transformer further enhances the heat dissipation effect, placing the rubber pad 200 in a more stable temperature environment, and making it easier to maintain the elastic deformation capacity and sealing performance of the rubber pad 200.

[0041] In some embodiments, the transformer includes a heat exchanger, the fluid outlet of which is connected to the heat dissipation channel 110. The heat exchanger can be a heat exchange air vent or a heat exchange pipe through which a cooling liquid medium (such as water at room temperature) flows, thereby rapidly dissipating the heat at the bottom of the oil-immersed transformer by increasing air convection in the heat dissipation channel 110 or by introducing cold water.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0043] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A transformer oil tank, comprising a cavity for holding a transformer and an evaporative cooling medium, characterized in that, The upper surface of the bottom plate of the transformer oil tank is covered with a rubber pad, and several fasteners penetrate the rubber pad vertically and extend into the bottom plate to fix the two. The bottom plate of the oil tank is composed of heat dissipation components, and the edge of the bottom plate is penetrated in a direction parallel to the horizontal plane to form a heat dissipation channel, so that the bottom plate of the oil tank forms a partially hollow structure.

2. The transformer oil tank according to claim 1, characterized in that, The bottom plate of the fuel tank includes a first heat dissipation plate and a second heat dissipation plate stacked and fixed together along the horizontal plane. The opposing surfaces of the first heat dissipation plate and the second heat dissipation plate are recessed to form a plurality of first heat dissipation grooves and a plurality of second heat dissipation grooves, respectively. Both ends of the first heat dissipation grooves and the second heat dissipation grooves penetrate the bottom plate of the fuel tank.

3. The transformer oil tank according to claim 2, characterized in that, The projections of the first heat dissipation groove and the second heat dissipation groove in the vertical direction are intersecting.

4. The transformer oil tank according to claim 2, characterized in that, The first heat sink is stacked on top of the second heat sink, and the first heat sink groove and the second heat sink groove are configured with at least one of the following structures: First structure: The depth of the first heat dissipation groove is greater than the depth of the second heat dissipation groove; In the second structure, the width of the first heat dissipation groove is greater than the width of the second heat dissipation groove.

5. The transformer oil tank according to claim 1, characterized in that, The fastener is a bolt, and the bolt head is pressed against the upper surface of the rubber pad by a buffer that can produce elastic deformation.

6. The transformer oil tank according to claim 1, characterized in that, The upper and / or lower surfaces of the rubber pad are coated with thermally conductive silicone grease.

7. The transformer oil tank according to claim 1, characterized in that, The bottom plate of the oil tank is fixed with several support blocks that surround the installation position of the transformer body. The side of the support block facing the installation position has several stepped portions that are adapted to the steel sheets of the transformer body.

8. The transformer oil tank according to claim 1, characterized in that, A plurality of support blocks are fixedly attached to the bottom plate of the oil tank, which surround the installation position of the transformer body. A first limiting plate is fixedly attached to the side of the support block facing away from the installation position. The bottom of the first limiting plate is fixedly attached to the bottom plate of the oil tank. A second limiting plate is connected to the side of the first limiting plate facing the installation position. The second limiting plate is configured to be fitted to the side of the transformer body by an elastic body to limit its movement.

9. An oil-immersed transformer, characterized in that, The transformer includes a transformer tank and a transformer body as described in any one of claims 1-8, wherein the transformer body is fixedly installed in the receiving cavity that contains the evaporative cooling medium.

10. The transformer according to claim 9, characterized in that, The transformer includes a heat exchanger, and the fluid outlet of the heat exchanger is connected to the heat dissipation channel.

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