Aluminum alloy cast multiple metal isolated transformer oil cooling heat exchanger

Abstract

The utility model belongs to oil -immersed transformer cooling equipment technical field, especially relates to a kind of aluminium alloy cast multiple metal isolation's transformer oil cooling heat exchanger.Cooling medium passage and transformer oil passage are located in aluminium alloy cast main body, multiple cooling medium passage is longitudinally sequentially distributed, and cooling medium passage is used to connect with external cooling system.Cooling medium passage is longitudinally sequentially distributed in multiple groups of transformer oil passage, and one cooling medium passage is arranged between the adjacent two groups of transformer oil passage, and transformer oil passage is used to connect with transformer oil circulation system.Cooling medium passage and transformer oil passage between adjacent are provided with multiple metal isolation layer.Heat can be absorbed by cooling medium in cooling medium passage, and then transformer oil cooling or heat recovery is utilized.Multiple metal isolation structure is formed, the problem of single isolation layer of traditional heat exchanger is solved, and the stability and reliability of transformer operation are further improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil-immersed transformer cooling equipment, and specifically relates to an aluminum alloy cast type multi-metal isolated transformer oil cooling heat exchanger. Background Technology

[0002] In power systems, oil-immersed transformers are important power transmission equipment. They generate a lot of heat during operation. If the heat cannot be dissipated in time, it will seriously affect the performance and lifespan of the transformer.

[0003] However, the radiators currently used in oil-immersed transformers have significant shortcomings in terms of material selection and heat exchange efficiency. Most radiators are made of a single metal material with low thermal conductivity and low heat exchange efficiency, failing to quickly dissipate the heat from the transformer oil. Moreover, the heat is directly dissipated into the atmosphere through the radiator, easily causing a large amount of heat energy waste, especially in large power transformers and rectifier transformers, where this heat energy waste is even more prominent.

[0004] Secondly, traditional heat exchangers typically only have a single heavy metal isolation structure to separate the cooling medium from the transformer oil. However, transformer oil has extremely high cleanliness requirements. If leakage between the hot and cold channels causes the cooling medium to mix into the transformer oil, it will lead to a major safety accident, seriously threatening the normal operation of the transformer and potentially even causing the power system to shut down.

[0005] Furthermore, traditional transformers suffer from poor heat dissipation, resulting in transformer oil remaining at consistently high temperatures. This leads to increased load losses, shortened insulation life, and reduced operational safety and stability. Additionally, ensuring normal transformer operation requires the use of more core, coils, steel, and transformer oil during manufacturing, increasing costs and consuming excessive resources. Therefore, designing an aluminum alloy cast, multi-metal isolated transformer oil cooling heat exchanger is essential to address these issues. Utility Model Content

[0006] To address the aforementioned problems, this utility model provides an aluminum alloy cast type multi-metal isolated transformer oil cooling heat exchanger to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an aluminum alloy cast-type transformer oil cooling heat exchanger with multi-metal isolation, comprising: Aluminum alloy cast body; Cooling medium channels are located within the aluminum alloy casting body, and multiple cooling medium channels are longitudinally distributed in sequence. The cooling medium channels are used to connect to an external cooling system. The transformer oil channel is located inside the aluminum alloy casting body. Multiple sets of the transformer oil channels are arranged longitudinally. A cooling medium channel is provided between each two adjacent sets of transformer oil channels. The transformer oil channels are used to connect to the transformer oil circulation system. A multi-metal isolation layer is provided within the aluminum alloy casting body, and the multi-metal isolation layer is provided between the cooling medium channel and the transformer oil channel.

[0008] Furthermore, the multiple metal isolation layer includes a triple metal isolation layer, which is longitudinally distributed. The metal isolation layer is made of a metal material with high thermal conductivity, corrosion resistance, and high strength.

[0009] Furthermore, the aluminum alloy casting body is integrally formed using an aluminum alloy casting process.

[0010] Furthermore, the cooling medium channel is made of copper or stainless steel and is tightly fitted to the aluminum alloy casting body; the transformer oil channel is made of stainless steel.

[0011] Furthermore, the tube ends of the aluminum alloy cast body are treated with a gas welding process.

[0012] Furthermore, the surface of the aluminum alloy casting body is provided with a surface treatment layer.

[0013] The technical effects and advantages of this utility model are as follows: 1. Instead of directly dissipating the heat generated by the transformer into the atmosphere, the heat can be absorbed by the cooling medium in the cooling medium channel and then recovered and reused, which is in line with the concept of green environmental protection and reduces heat waste.

[0014] 2. Multiple metal isolation layers are set up. Combined with the barrier effect of the aluminum alloy casting body itself, a multi-metal isolation structure is formed, which solves the problem of easy leakage of the single isolation layer in traditional heat exchangers. It ensures that the cooling medium and transformer oil will not mix with each other, avoids the occurrence of major safety accidents, and ensures the safe operation of the transformer.

[0015] 3. Because the transformer oil can be cooled efficiently, the load loss of the transformer is significantly reduced after the oil temperature is lowered. At the same time, the aging rate of the internal insulation material of the transformer is slowed down, the insulation life is extended, and the stability and reliability of the transformer operation are further improved.

[0016] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of the aluminum alloy cast-type multi-metal isolated transformer oil cooling heat exchanger according to an embodiment of the present invention is shown. Figure 2 This invention provides a schematic diagram of the internal structure of an aluminum alloy cast-type multi-metal isolated transformer oil cooling heat exchanger according to an embodiment of the present invention. Figure 3 It shows Figure 1 A cross-sectional view along the AA direction.

[0019] Reference numerals: 1. Aluminum alloy cast body; 2. Cooling medium channel; 3. Transformer oil channel; 4. Multiple metal isolation layer; 5. Transformer oil inlet; 6. Transformer oil outlet; 7. Cooling medium inlet; 8. Cooling medium outlet; 9. Pipe end. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] The positive X-axis points forward, and the negative X-axis points backward; the positive Y-axis points left, and the negative Y-axis points right; the positive Z-axis points upward, and the negative Z-axis points downward. Vertical axis represents forward and backward, and horizontal axis represents left and right.

[0022] like Figures 1 to 3As shown in the figure, an aluminum alloy cast-type transformer oil cooling heat exchanger with multiple metal isolation according to an embodiment of the present invention includes an aluminum alloy cast body 1, cooling medium channels 2, transformer oil channels 3, and a multiple metal isolation layer 4. The cooling medium channels 2 are located within the aluminum alloy cast body 1, and multiple cooling medium channels 2 are arranged longitudinally in sequence. The cooling medium channels 2 are used to connect to an external cooling system. The transformer oil channels 3 are located within the aluminum alloy cast body 1, and multiple sets of transformer oil channels 3 are arranged longitudinally in sequence. A cooling medium channel 2 is provided between each two adjacent sets of transformer oil channels 3. The transformer oil channels 3 are used to connect to a transformer oil circulation system. The multiple metal isolation layer 4 is located within the aluminum alloy cast body 1, and is provided between adjacent cooling medium channels 2 and transformer oil channels 3.

[0023] Specifically, the cooling medium channel 2 and the transformer oil channel 3 are arranged inside the aluminum alloy casting body 1, which can isolate the cooling medium channel 2 and the transformer oil channel 3. Multiple metal isolation layers 4 are provided between each group of transformer oil channels 3 and each cooling medium channel 2 to prevent direct contact between the transformer oil channels 3 and the cooling medium channels 2. This ensures that even during long-term use, there will be no leakage between the hot and cold channels, thus preventing transformer oil from mixing into the cooling medium and avoiding safety accidents.

[0024] Secondly, the transformer oil channel 3 is connected to the transformer oil circulation system. The transformer oil flows within the transformer oil channel 3, transferring heat to the aluminum alloy casting body 1 and the multi-metal isolation layer 4. Secondly, the cooling medium channel 2 is connected to the external cooling system. The cooling medium flows within the cooling medium channel 2, absorbing the heat transferred from the aluminum alloy casting body 1 and the multi-metal isolation layer 4, thus cooling the transformer oil.

[0025] Therefore, the heat generated by the transformer is no longer directly dissipated into the atmosphere. Instead, the heat can be absorbed by the cooling medium in the cooling medium channel 2 and then recycled, which is in line with the concept of green environmental protection and reduces heat waste.

[0026] Secondly, by setting up multiple metal isolation layers 4, combined with the barrier effect of the aluminum alloy casting body 1 itself, a multi-metal isolation structure is formed, which solves the problem of easy leakage of the single isolation layer in traditional heat exchangers, ensures that the cooling medium and transformer oil will not mix with each other, avoids the occurrence of major safety accidents, and ensures the safe operation of the transformer.

[0027] In addition, because the transformer oil can be cooled efficiently, the load loss of the transformer is significantly reduced after the oil temperature is lowered. At the same time, the aging rate of the internal insulation material of the transformer is slowed down, the insulation life is extended, and the stability and reliability of the transformer operation are further improved.

[0028] In this embodiment, the cooling medium includes Freon, cooling water, etc. Secondly, the cooling medium that absorbs heat can be transported to a heat recovery device for heat energy reuse. Specifically, for example, using the reverse Carnot cycle of a heat pump system, low-grade heat energy is circulated to the condenser of the heat pump system to release high-grade heat energy. Furthermore, each group of transformer oil channels 3 includes multiple horizontally arranged individual transformer oil channels 3, which are vertically arranged. Each cooling medium channel 2 includes a first pipe horizontally arranged at both ends and multiple second pipes vertically arranged in the middle. The multiple second pipes are horizontally distributed along the axial direction of the first pipe and are used to connect the upper and lower first pipes. In addition, the transformer oil channel 3 has a transformer oil inlet 5 at the upper end and a transformer oil outlet 6 at the lower end, while the cooling medium channel 2 has a cooling medium inlet 7 at the lower end and a cooling medium outlet 8 at the upper end.

[0029] Optionally, the multiple metal isolation layer 4 includes a triple metal isolation layer, which is longitudinally distributed. The metal isolation layer is made of a metal material with high thermal conductivity, corrosion resistance, and high strength.

[0030] Specifically, the multi-metal isolation layer 4 is set as a triple metal isolation layer. On the one hand, it solves the problem of easy leakage of the single isolation layer in traditional heat exchangers. On the other hand, it can also avoid setting too many metal isolation layers, which would lead to excessive costs.

[0031] In this embodiment, the metal isolation layer can be made of stainless steel.

[0032] Optionally, the aluminum alloy casting body 1 is integrally formed using an aluminum alloy casting process.

[0033] Specifically, during the casting process, molten aluminum alloy is used to integrally form the transformer oil channel 3 and the cooling medium channel 2. On one hand, aluminum alloy serves as an excellent heat conductor; its light weight and high thermal conductivity allow it to quickly transfer heat from the transformer oil in the transformer oil channel 3 to the cooling medium channel 2, effectively improving heat exchange efficiency. On the other hand, aluminum alloy itself possesses good barrier properties, which can initially isolate the cooling medium from the transformer oil, preventing direct contact between the two.

[0034] Optionally, the cooling medium channel 2 is made of copper or stainless steel and is tightly fitted to the aluminum alloy casting body 1, and the transformer oil channel 3 is made of stainless steel.

[0035] Specifically, the transformer oil channel 3 is made of corrosion-resistant, high-strength stainless steel, and the cooling medium channel 2 is made of high thermal conductivity, high-strength copper or stainless steel pipe tightly bonded to the aluminum alloy casting body. Combined with multiple metal isolation layers 4, it is conducive to forming a multi-isolation structure, ensuring that even during long-term use, there will be no leakage between the hot and cold channels, thereby ensuring that the transformer oil will not mix into the cooling medium and avoiding safety accidents.

[0036] Optionally, the tube end 9 of the aluminum alloy cast body 1 is treated by wind welding.

[0037] Specifically, the pipe end 9 of the aluminum alloy casting body 1 is treated with a gas welding process, which helps to enhance the sealing and structural strength of the pipe end 9 and further prevent leakage.

[0038] In this embodiment, the tube end 9 of the aluminum alloy casting body 1 is the position where the outside of the aluminum alloy casting body 1 connects with the transformer oil channel 3 and the cooling medium channel 2.

[0039] Optionally, the surface of the aluminum alloy casting body 1 is provided with a surface treatment layer.

[0040] Specifically, by setting a surface treatment layer on the surface of the aluminum alloy casting body 1, such as by anodizing or powder coating, the corrosion resistance and service life of the heat exchanger can be improved.

[0041] Preferably, the transformer oil channel 3 and cooling medium channel 2 are prefabricated according to the dimensions and structure designed in the drawings. The two hot and cold channels are evenly separated by spacers of specific sizes to ensure that the two hot and cold channels maintain the set distance. Then, the hot and cold channels are welded to the corresponding manifolds. Before casting the aluminum alloy, compressed air is passed through each of the hot and cold channels to check for leaks. If there are leaks, they are repaired by welding to ensure that there are no leaks. The prefabricated parts of the transformer oil channel and cooling medium channel are preheated to 680°C, and then the molten aluminum alloy is poured into the prefabricated parts. A vibrator at 600 Hz is turned on to ensure that the liquid aluminum alloy enters all the gaps in the prefabricated parts. It is then allowed to cool naturally to room temperature. The pipe ends 9 are sealed using a gas welding process, and finally, surface treatment is performed, such as spraying an anti-corrosion coating.

[0042] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-metal isolated aluminum alloy cast transformer oil cooling heat exchanger, characterized in that, include: Aluminum alloy casting body (1); Cooling medium channel (2) is located inside the aluminum alloy casting body (1). Multiple cooling medium channels (2) are arranged longitudinally in sequence. The cooling medium channels (2) are used to connect to an external cooling system. Transformer oil channel (3), the transformer oil channel (3) is located inside the aluminum alloy casting body (1), multiple sets of transformer oil channels (3) are arranged longitudinally, and a cooling medium channel (2) is provided between two adjacent sets of transformer oil channels (3), the transformer oil channel (3) is used to connect to the transformer oil circulation system; A multi-metal isolation layer (4) is located inside the aluminum alloy casting body (1), and the multi-metal isolation layer (4) is provided between the cooling medium channel (2) and the transformer oil channel (3).

2. The aluminum alloy cast-type multi-metal isolated transformer oil cooling heat exchanger according to claim 1, characterized in that, The multiple metal isolation layer (4) includes a triple metal isolation layer, which is distributed longitudinally. The metal isolation layer is made of a metal material with high thermal conductivity, corrosion resistance and high strength.

3. The aluminum alloy cast-type multi-metal isolated transformer oil cooling heat exchanger according to claim 1, characterized in that, The aluminum alloy casting body (1) is integrally formed using an aluminum alloy casting process.

4. The aluminum alloy cast-type multi-metal isolated transformer oil cooling heat exchanger according to claim 1, characterized in that, The cooling medium channel (2) is made of copper or stainless steel and is closely fitted to the aluminum alloy casting body (1). The transformer oil channel (3) is made of stainless steel.

5. The aluminum alloy cast-type multi-metal isolated transformer oil cooling heat exchanger according to claim 1, characterized in that, The tube end (9) of the aluminum alloy cast body (1) is treated by wind welding.

6. The aluminum alloy cast-type multi-metal isolated transformer oil cooling heat exchanger according to claim 1, characterized in that, The surface of the aluminum alloy casting body (1) is provided with a surface treatment layer.

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