Transformer or reactor based on composite liquid cooling heat dissipation technology and manufacturing method thereof

Abstract

The invention discloses a transformer or electric reactor based on a composite liquid cooling heat dissipation technology and a manufacturing method thereof.The transformer or electric reactor comprises a bottom plate, an iron core arranged on the bottom plate and a hollow coil winding, the hollow coil winding is wound around the iron core, a liquid cooling plate is arranged on the side face of the iron core, and the liquid cooling plate is arranged on the bottom plate. The side face of the liquid cooling plate makes contact with and is attached to the side face of the iron core, wiring terminals are arranged at the two ends of the hollow coil winding, an inner cavity of the hollow coil winding is communicated with an inner cavity of the liquid cooling plate through an external water pipe to form a cooling liquid path, and a pouring body is further arranged on the bottom plate. And the casting body is wrapped outside the iron core and the hollow coil winding. The heat dissipation effect of the liquid-cooled transformer is further improved, higher heat dissipation performance is achieved, meanwhile, the occupied space is small, the overall size is small, and installation is convenient.

Description

Technical Field

[0001] The present invention relates to a liquid-cooled transformer or reactor and a manufacturing method thereof, in particular to a transformer or reactor based on a composite liquid-cooled heat dissipation technology and a manufacturing method thereof, belonging to the technical field of transformer or reactor heat dissipation. Background Art

[0002] With the rapid development of power conversion technology, the power density of power conversion equipment is getting higher and higher, and the size is getting smaller and smaller. As the core electromagnetic components and main heat sources in the power conversion system, the heating problem of transformers and reactors is becoming more and more serious. Especially in high-frequency and high-voltage transformers, reactors, and transformer integrated reactor structures, the heat dissipation problem of transformers and reactors is becoming increasingly prominent. The heating parts of transformers or reactors are mainly coils and iron cores. It is particularly important to solve the heat dissipation problem of coils and iron cores.

[0003] The windings of liquid-cooled transformers are made of hollow wires. During operation, coolant is injected into the hollow windings and heat is removed through water circulation. Liquid-cooled transformers have the following advantages: 1. High efficiency and energy saving: The hollow conductor liquid-cooled transformer uses hollow conductors as windings, which greatly improves the efficiency of current passing. The traditional copper winding has a large impedance, loses a lot of electric energy, and causes a lot of waste. Therefore, the hollow conductor liquid-cooled transformer has the advantage of high efficiency and energy saving.

[0004] 2. Good heat dissipation effect: The winding of the hollow conductor liquid-cooled transformer adopts hollow conductor, which is shorter than the traditional transformer winding length and has better heat dissipation conditions. At the same time, the flow of water can take away the heat, and the heat dissipation effect is better.

[0005] 3. Small size: Compared with traditional transformers, hollow conductor liquid-cooled transformers take up less space, are smaller in size, and are easier to install under the same power.

[0006] However, in certain application conditions, such as applications with high requirements for heat dissipation efficiency, or situations where internal heat is difficult to dissipate (for example, in power grid products, in order to ensure insulation withstand voltage, the winding distance is increased. The iron core is inside the center of the product, and heat accumulates and is difficult to dissipate, and it is often necessary to increase the volume to reduce losses). Existing liquid-cooled transformers often rely solely on the cooling water flowing inside themselves to dissipate heat, and still cannot meet the heat dissipation requirements.

[0007] A Chinese utility model patent with authorization announcement number CN204991372U and authorization announcement date January 20, 2016 discloses an epoxy resin cast liquid-cooled phase-shifting transformer, including three groups of transformer phases, each group of transformer phases including an iron core, multiple grid-side coils and multiple valve-side phase-shifting coils, each grid-side coil and valve-side phase-shifting coil is arranged in sequence from top to bottom, the grid-side coil and the valve-side phase-shifting coil are concentrically arranged, the iron core is located inside the grid-side coil and the valve-side phase-shifting coil, the grid-side coil and the valve-side phase-shifting coil are both wound by a single hollow wire or multiple parallel hollow wires and are formed by epoxy resin vacuum casting, and insulating spacers are provided between the hollow wires.

[0008] In order to facilitate the water supply to the phase-shifting winding, it also includes an inlet manifold and an outlet manifold. The water outlets at the starting ends of the hollow wires of the phase-shifting coils on each valve side are connected to the inlet manifold through insulating hoses; the water outlets at the terminal ends of the hollow wires of the phase-shifting coils on each valve side are connected to the outlet manifold through insulating hoses.

[0009] The transformer in the above patent document can only dissipate heat by its own water channel, and in certain application conditions, it cannot meet the higher heat dissipation requirements.

[0010] Therefore, how to further improve the heat dissipation effect of the liquid-cooled transformer to achieve higher heat dissipation performance while ensuring that the space occupied by the liquid-cooled transformer does not increase, the overall volume does not increase, and it is easy to install is a technical problem that needs to be solved urgently. Summary of the invention

[0011] The technical problem to be solved by the present invention is to address the defects existing in the prior art and to provide a liquid-cooled high-frequency high-voltage transformer or reactor with an integrated composite heat dissipation method and a manufacturing method thereof, which further improves the heat dissipation effect of the liquid-cooled transformer and achieves higher heat dissipation performance. At the same time, it occupies less space and has a smaller overall volume, making it easier to install.

[0012] In order to solve the above technical problems, the technical solution adopted by the present invention is: a transformer or inductor based on composite liquid cooling heat dissipation technology and a manufacturing method thereof, comprising a base plate, an iron core arranged on the base plate and a hollow coil winding, the hollow coil winding is wound on the iron core, and the coil turns are insulated from each other. A liquid cooling plate is arranged on the side of the iron core, and the side of the liquid cooling plate is in contact with and fits with the side of the iron core. Terminals are arranged on both ends of the hollow coil winding, and the internal cavity of the hollow coil winding is connected to the inner cavity of the liquid cooling plate through an external water pipe to form a cooling liquid path. A cast body is also arranged on the base plate, and the cast body is wrapped around the outside of the iron core and the hollow coil winding.

[0013] Preferably, the liquid cooling plate includes a liquid cooling plate fitting portion and a liquid cooling plate extension portion arranged on the liquid cooling plate fitting portion, the liquid cooling plate fitting portion matches the contour of the iron core and the liquid cooling plate fitting portion is in contact with the side of the iron core, the liquid cooling plate extension portion, the terminal block and the external water pipe are all exposed from the cast body, and the two ends of the hollow coil winding are connected to the liquid cooling plate extension portion through the external water pipe.

[0014] Preferably, the iron core includes iron core one and iron core two, and the iron core one and iron core two are arranged with the same central axis. The liquid cooling plate is arranged between iron core one and iron core two, and one side of the liquid cooling plate is in contact with and fits with one side of the iron core one, and the other side of the liquid cooling plate is in contact with and fits with one side of the iron core two.

[0015] Preferably, the connection terminals of the hollow coil winding are compatible with the confluence and water circuit transfer of the liquid cooling circuit, or the exposed part of the liquid cooling plate can also be compatible with the confluence and water circuit transfer of the liquid cooling circuit.

[0016] Preferably, the liquid cooling plate can be connected to a terminal compatible with the water confluence through an external water pipe. If the integral confluence of the water confluence and the liquid cooling plate are designed as one body, the terminal can also be connected to the joint on the liquid cooling plate through the external water confluence.

[0017] Preferably, the hollow coil winding comprises an inner hollow coil winding and an outer hollow coil winding, the outer hollow coil winding is located at the outer peripheral position of the inner hollow coil winding, the two ends of the inner hollow coil winding are respectively provided with an inner pipe joint 1 and an inner pipe joint 2, the wiring terminals comprise a wiring terminal 1 and a wiring terminal 2, the wiring terminal 1 is arranged on the inner pipe joint 1, and the wiring terminal 2 is arranged on the inner pipe joint 2; the two ends of the outer hollow coil winding are respectively provided with an outer pipe joint 1 and an outer pipe joint 2, the wiring terminals also comprise a wiring terminal 3 and a wiring terminal 4, the wiring terminal 3 is arranged on the outer pipe joint 1, and the wiring terminal 4 is arranged on the outer pipe joint 2; a water inlet 1 is arranged on the inner pipe joint 2, the water inlet 1 is connected with the inner pipe joint 2, a water inlet 2 is arranged on the outer pipe joint 2, and the water inlet 2 is connected with the outer pipe joint 2; the external water pipe comprises a water pipe 1, a water pipe 2 and a water pipe 3; The inner layer pipe joint 2 is connected to the joint 1 of the liquid cooling plate through the water pipe 1, the joint 2 of the liquid cooling plate is connected to the outer layer pipe joint 1 through the water pipe 2, the outer layer pipe joint 2 is connected to the inner layer pipe joint 1 through the water pipe 3, and the water inlet 1 and the water inlet 2 are connected to the external cooling liquid source.

[0018] Preferably, the casting body is arranged in a cross shape, and here, it can also be cast into different shapes, depending on the mold shape and assembly requirements.

[0019] Preferably, the material of the casting body is epoxy resin or silicone.

[0020] Preferably, the core material can be suitable for ferrite, silicon steel sheet, magnetic powder core and other material types. The core assembly shape can be various core shapes such as UI type, EE type, UU type and so on.

[0021] Preferably, the hollow coil winding adopts a hollow copper tube or a hollow aluminum tube, and the shape is a square tube or a round tube.

[0022] Preferably, the liquid cooling plate is in an F shape. If it is another core shape, different liquid cooling plate forms can be set according to the actual appearance. The specific shape is mainly determined by the principle that the cold plate and the core shape are as similar in size and contour as possible outside the reserved winding sleeve opening to ensure the maximum contact area.

[0023] Preferably, a hanging ring is also provided on the top of the casting body.

[0024] The present invention also discloses a method for manufacturing a transformer or a reactor as described above, wherein the manufacturing method comprises firstly fitting and contacting the iron core 1, a liquid cooling plate and the iron core 1 together, wherein the liquid cooling plate is in an F shape, the iron core 1 and the iron core 2 are both in a U shape and the U-shaped openings of the iron core 1 and the iron core 2 are facing one side, and then inserting the hollow coil winding from one side of the U-shaped openings of the iron core 1 and the iron core 2 into the iron core 1, the liquid cooling plate and the iron core 1, so that the hollow coil winding is wound on one side of the iron core, and then filling the iron core 1 and the filling iron core 2 are respectively filled in the U-shaped openings of the iron core 1 and the iron core 2, so that the iron core 1 and the iron core 2 become hollow rectangular structures, and finally casting is performed.

[0025] The beneficial effects of the present invention are: when the liquid-cooled transformer or reactor of the present invention dissipates heat, it not only dissipates heat through the water path inside the hollow coil winding, but also adds a liquid cooling plate as an internal heat dissipation component to further improve the heat dissipation performance for heat dissipation, thereby further improving the heat dissipation effect of the liquid-cooled transformer and achieving higher heat dissipation performance. At the same time, the internal cavity of the hollow coil winding is connected to the inner cavity of the liquid cooling plate through an external water pipe to form a cooling liquid path, without the need to make a cooling liquid path for the hollow coil winding and another cooling liquid path for the liquid cooling plate. In addition, the liquid cooling plate is attached to the side of the core. These designs make the liquid-cooled transformer in this embodiment occupy less space and have a smaller overall volume, which is convenient for installation. The terminal block, the external water pipe and one end of the liquid cooling plate are placed outside the casting body, which is convenient for observation and pipe connection operations, avoiding the risk of leakage inside the potting body that is not identified in time, and improving the safety performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of a liquid-cooled transformer or reactor in an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure after removing the casting body; Figure 3 This is a schematic diagram of the three-dimensional structure of the iron core 1, the liquid cooling plate and the iron core 2 in the first embodiment of the present invention; Figure 4 for Figure 1 A schematic diagram of a local three-dimensional structure located at the top of the casting body; Figure 5 This is a schematic diagram of the three-dimensional structure of the liquid cooling plate, the external water pipe and the hollow coil winding in the first embodiment of the present invention; Figure 6 for Figure 5 A schematic diagram of a partial three-dimensional structure located at an external water pipe; Figure 7 The principle diagram of manufacturing a liquid-cooled transformer or reactor in the first embodiment of the present invention is shown in FIG. Figure 1 ; Figure 8 The principle diagram of manufacturing a liquid-cooled transformer or reactor in the first embodiment of the present invention is shown in FIG. Figure 2 ; Fig. 9 The principle diagram of manufacturing a liquid-cooled transformer or reactor in the first embodiment of the present invention is shown in FIG. Figure 3 ; Fig.10 It is a schematic diagram of the three-dimensional structure of a liquid-cooled transformer or reactor in the second embodiment of the present invention; In the figure: 1. bottom plate, 2. core 1, 211. filling core 1, 3. core 2, 311. filling core 2, 4. hollow coil winding, 41. inner hollow coil winding, 411. inner pipe joint 1, 412. inner pipe joint 2, 42. outer hollow coil winding, 421. outer pipe joint 1, 422. outer pipe joint 2, 5. liquid cooling plate, 511. liquid cooling plate bonding part, 512. liquid cooling plate extension part, 6. terminal, 611. terminal 1, 612. terminal 2, 613. terminal 4, 7. external water pipe, 711. water pipe 1, 712. water pipe 2, 713. water pipe 3, 8. casting body, 9. sprue 1, 10. sprue 2, 11. lifting ring, 12. joint 1, 13. joint 2. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Embodiment 1: Figure 1 and Figure 2As shown, a transformer or reactor based on composite liquid cooling heat dissipation technology includes a base plate 1, an iron core arranged on the base plate 1 (in this embodiment, the iron core includes an iron core 2 and an iron core 3, but here, it can also be arranged as a single iron core) and a hollow coil winding 4. In this embodiment, the iron core is a hollow rectangular shape, but the iron core can also be a non-rectangular shape, such as EE, or U-shaped, etc. The hollow coil winding 4 passes through the middle cavity of the iron core and is wound on the side of the iron core (it can be both sides or a single side), and a liquid cooling plate 5 is arranged on the side of the iron core, and the side of the liquid cooling plate 5 is in contact with and fits with the side of the iron core. Terminals 6 are arranged on both ends of the hollow coil winding 4, and the internal cavity of the hollow coil winding 4 is connected to the inner cavity of the liquid cooling plate 5 through an external water pipe 7 to form a cooling liquid path. A casting body 8 is also arranged on the base plate 1, and the casting body 8 is wrapped around the outside of the iron core and the hollow coil winding to play an insulating protection role. In this embodiment, the casting body 8 can be made of epoxy resin, because this embodiment is a product structure for epoxy casting, but it can also be used for thermal conductive silicone, epoxy resin glue potting, or even oil cooling structure. The thermal conductive cooling medium in the cooling liquid circuit can be deionized water, or it can be a medium such as refrigerant.

[0029] When the present embodiment dissipates heat, it not only dissipates heat through the water path inside the hollow coil winding 4, but also adds a liquid cooling plate 5 as an internal heat dissipation component to further improve the heat dissipation performance. This further improves the heat dissipation effect of the liquid-cooled transformer and achieves a higher heat dissipation performance. At the same time, the internal cavity of the hollow coil winding is connected to the inner cavity of the liquid cooling plate through an external water pipe to form a cooling liquid path, without the need to make a cooling liquid path for the hollow coil winding and another cooling liquid path for the liquid cooling plate. In addition, the liquid cooling plate is attached to the side of the iron core. These designs make the liquid-cooled transformer in the present embodiment occupy less space and have a smaller overall volume, which is easy to install. Compared with the patent literature mentioned in the background technology, the difference of the present embodiment is that the present embodiment can be applied to both transformers and reactors, and is not necessarily limited to use in mobile transformers. It can also be used for high-frequency single-phase transformers, reactors and other winding structures. However, it is preferably suitable for high-frequency transformers. This is because the high-frequency transformer windings work at high frequencies, and the skin effect causes the current to be concentrated at the edge of the wire for transmission. The current in the middle of the wire is small or close to being offset. In this case, the middle part is used as a hollow wire to pass the cooling medium, which can just take advantage of the current distribution characteristics of the skin effect. In addition, the arrangement of the coil in this embodiment is more flexible. The two core columns can be arranged separately, or only one coil can be arranged as a reactor, or one coil can be divided into multiple internal and external arrangements, external series and parallel, etc., and there can be a variety of flexible combinations.

[0030] If multiple cores are provided, the multiple cores are arranged with the same central axis, such as Figure 3 As shown, in this embodiment, the core 1 2 and the core 2 3 are arranged along the central axis, and the liquid cooling plate 5 is in an F shape, which is arranged between the core 1 2 and the core 2 3, and one side of the liquid cooling plate 5 is in contact with and fits with one side of the core 1 2, and the other side of the liquid cooling plate 5 is in contact with and fits with one side of the core 2 3. This arrangement can further reduce the occupied space of the liquid-cooled transformer.

[0031] like Figure 3 and Figure 4 As shown, the liquid cooling plate 5 includes a liquid cooling plate fitting portion 511 and a liquid cooling plate extension portion 512 arranged on the liquid cooling plate fitting portion 511. The liquid cooling plate fitting portion 511 and the liquid cooling plate extension portion 512 are an integrated structure. The liquid cooling plate fitting portion 511 matches the contour of the iron core and the liquid cooling plate fitting portion 511 is in contact with the side of the iron core. The liquid cooling plate extension portion 512, the terminal 6 and the external water pipe 7 are all exposed to the casting body 8, and the two ends of the hollow coil winding are connected to the liquid cooling plate extension portion through the external water pipe 7. In this way, the above-mentioned components are placed outside the casting body, which is convenient for observation and pipe connection operations, avoiding the risk of leakage inside the potting body that is not identified in time, and improving the safety performance of the product. Compared with the patent literature mentioned in the background technology, the difference of this embodiment is: the patent literature mentioned in the background technology also requires that the water outlets be connected to the water outlet manifolds through insulating hoses respectively, but in this embodiment, the water outlet joints, circuit joints, and confluences are combined together, and there are no other joints and connection points inside, which is simpler, reduces the risk of joint leakage, and saves space for the connections of each joint.

[0032] like Figure 5 and Figure 6As shown, the hollow coil winding 4 includes an inner hollow coil winding 41 and an outer hollow coil winding 42. The outer hollow coil winding 42 is located outside the inner hollow coil winding 41. The hollow coil winding 4 can be made of a hollow copper tube or an aluminum tube, and the shape can be a square tube or a round tube. The two ends of the inner hollow coil winding 41 are respectively provided with an inner pipe joint 1 411 and an inner pipe joint 2 412, the wiring terminal 6 includes a wiring terminal 1 611 and a wiring terminal 2 612, the wiring terminal 1 611 is arranged on the inner pipe joint 1 411, and the wiring terminal 2 612 is arranged on the inner pipe joint 2 412; the two ends of the outer hollow coil winding 42 are respectively provided with an outer pipe joint 1 421 and an outer pipe joint 2 422, the wiring terminal 6 also includes a wiring terminal 3 (not shown in the figure) and a wiring terminal 4 613, the wiring terminal 3 is arranged on the outer pipe joint 1 421, and the wiring terminal 4 613 is arranged on the outer pipe joint 2 422; a sprue 1 9 is arranged on the inner pipe joint 2 412, the sprue 1 9 is connected to the inner pipe joint 2 412, and a sprue 2 10 is arranged on the outer pipe joint 2 422, and the sprue 2 10 is connected to the outer pipe joint 2 422. The external water pipe 7 includes water pipe one 711, water pipe two 712 and water pipe three 713. The inner layer pipe joint two 412 is connected to the joint one 12 on the liquid cooling plate extension part of the liquid cooling plate 5 through the water pipe one 711. The joint two 13 on the liquid cooling plate extension part of the liquid cooling plate 5 is connected to the outer layer pipe joint one 421 through the water pipe two 712. The outer layer pipe joint two 422 is connected to the inner layer pipe joint one 411 through the water pipe three 713. The water inlet one 9 and the water inlet two 10 are connected to the external cooling liquid source, so that a cooling liquid path is formed through the above-mentioned connection structure. In this way, the water path of the liquid cooling plate and the water path of the hollow coil winding are integrated into one cooling liquid path, which further improves the heat dissipation effect while reducing the overall volume of the liquid-cooled transformer.

[0033] like Figure 1 As shown, during casting, the casting body 8 is designed into a cross shape, which can further reduce the overall volume of the liquid-cooled transformer. Here, it is also possible to cast into different shapes, depending on the mold shape and assembly requirements.

[0034] This embodiment also discloses a method for manufacturing the liquid-cooled transformer as described above. Figures 7 to 9As shown, first, the iron core 1 2, the liquid cooling plate 5 and the iron core 1 2 are fitted together, at this time, the liquid cooling plate 5 is in an F shape, the iron core 1 2 and the iron core 2 3 are both in a U shape and the U-shaped openings of the iron core 1 2 and the iron core 2 3 face one side, and then the hollow coil winding 4 is inserted into the iron core 1 2, the liquid cooling plate 5 and the iron core 1 2 from one side of the U-shaped opening of the iron core 1 2 and the iron core 2 3, so that the hollow coil winding 4 is wound on one side of the iron core, and then the filling iron core 1 2 11 and the filling iron core 2 3 11 are respectively filled in the U-shaped openings of the iron core 1 2 and the iron core 2 3, so that the iron core 1 2 and the iron core 2 3 become a hollow rectangular structure, and finally cast. This embodiment simplifies the manufacturing process of the liquid-cooled transformer with a heat dissipation structure by designing the above-mentioned manufacturing method, and improves the manufacturing efficiency.

[0035] Embodiment 2: Fig.10 As shown, compared with the first embodiment, the difference is that: a lifting ring 11 is further provided on the top of the casting body 8; the lifting ring can facilitate the lifting and installation of the liquid-cooled transformer or reactor.

[0036] In summary, when the liquid-cooled transformer or reactor of the present invention dissipates heat, it not only dissipates heat through the water path inside the hollow coil winding, but also adds a liquid cooling plate as an internal heat dissipation component to further improve the heat dissipation performance for heat dissipation. This further improves the heat dissipation effect of the liquid-cooled transformer and achieves higher heat dissipation performance. At the same time, the internal cavity of the hollow coil winding is connected to the inner cavity of the liquid cooling plate through an external water pipe to form a cooling liquid path, without the need to make a cooling liquid path for the hollow coil winding and another cooling liquid path for the liquid cooling plate. In addition, the liquid cooling plate is attached to the side of the iron core. These designs make the liquid-cooled transformer in this embodiment occupy less space and have a smaller overall volume, which is easy to install. Placing the terminal, the external water pipe and one end of the liquid cooling plate outside the casting body is convenient for observation and pipe connection operations, avoiding the risk of leakage inside the potting body that is not identified in time, and improving the safety performance of the product.

[0037] The "multiple" mentioned in this embodiment refers to the number of "two or more". The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those skilled in the relevant technical field can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims

1. A transformer or reactor based on composite liquid cooling technology and a manufacturing method thereof, comprising a base plate, an iron core arranged on the base plate and an air-core coil winding, wherein the air-core coil winding is wound on the iron core, characterized in that: A liquid cooling plate is arranged on the side of the iron core, and the side of the liquid cooling plate is in contact with the side of the iron core. Terminals are arranged on both ends of the hollow coil winding. The internal cavity of the hollow coil winding is connected with the internal cavity of the liquid cooling plate through an external water pipe to form a cooling liquid path. A casting body is also arranged on the bottom plate, and the casting body is wrapped around the outside of the iron core and the hollow coil winding.

2. The transformer or reactor according to claim 1, characterized in that: The liquid cooling plate includes a liquid cooling plate fitting portion and a liquid cooling plate extension portion arranged on the liquid cooling plate fitting portion, the liquid cooling plate fitting portion matches the contour of the iron core and the liquid cooling plate fitting portion is in contact with the side of the iron core, the liquid cooling plate extension portion, the connecting terminal and the external water pipe are all exposed to the cast body, and the two ends of the hollow coil winding are connected to the liquid cooling plate extension portion through the external water pipe.

3. The transformer or reactor according to claim 2, characterized in that: The iron core includes iron core one and iron core two, and the iron core one and iron core two are arranged with the same central axis. The liquid cooling plate is arranged between iron core one and iron core two, and one side of the liquid cooling plate is in contact with and fits with one side of the iron core one, and the other side of the liquid cooling plate is in contact with and fits with one side of the iron core two.

4. The transformer or reactor according to claim 2 or 3, characterized in that: The hollow coil winding comprises an inner hollow coil winding and an outer hollow coil winding, the outer hollow coil winding is located at the outer peripheral position of the inner hollow coil winding, the two ends of the inner hollow coil winding are respectively provided with an inner pipe joint 1 and an inner pipe joint 2, the connecting terminals comprise a connecting terminal 1 and a connecting terminal 2, the connecting terminal 1 is arranged on the inner pipe joint 1, and the connecting terminal 2 is arranged on the inner pipe joint 2; the two ends of the outer hollow coil winding are respectively provided with an outer pipe joint 1 and an outer pipe joint 2, the connecting terminals also comprise a connecting terminal 3 and a connecting terminal 4, the connecting terminal 3 is arranged on the outer pipe joint 1, and the connecting terminal 4 is arranged on the outer pipe joint 2; a water inlet 1 is arranged on the inner pipe joint 2, the water inlet 1 is connected with the inner pipe joint 2, a water inlet 2 is arranged on the outer pipe joint 2, the water inlet 2 is connected with the outer pipe joint 2; the external water pipe comprises a water pipe 1, a water pipe 2 and a water pipe 3; The inner layer pipe joint 2 is connected to the joint 1 of the liquid cooling plate extension part of the liquid cooling plate through the water pipe 1, the joint 2 of the liquid cooling plate extension part of the liquid cooling plate is connected to the outer layer pipe joint 1 through the water pipe 2, the outer layer pipe joint 2 is connected to the inner layer pipe joint 1 through the water pipe 3, and the water outlet 1 and the water outlet 2 are connected to the external cooling liquid source.

5. The transformer or reactor according to claim 4, characterized in that: The casting body is arranged in a cross shape.

6. The transformer or reactor according to claim 4, characterized in that: The material of the casting body is epoxy resin or silicone.

7. The transformer or reactor according to claim 4, characterized in that: The hollow coil winding adopts a hollow copper tube or a hollow aluminum tube, and the shape is a square tube or a round tube.

8. The transformer or reactor according to claim 4, characterized in that: The liquid cooling plate is in an F shape.

9. The transformer or reactor according to claim 4, characterized in that: A hanging ring is also arranged on the top of the casting body.

10. A method for manufacturing a transformer or a reactor according to any one of claims 2 to 9, characterized in that: The manufacturing method is to first fit the iron core one, the liquid cooling plate and the iron core one together, at this time, the liquid cooling plate is in an F shape, the iron core one and the iron core two are both in a U shape and the U-shaped openings of the iron core one and the iron core two are facing one side, and then the hollow coil winding is inserted from one side of the U-shaped openings of the iron core one and the iron core two into the iron core one, the liquid cooling plate and the iron core one, so that the hollow coil winding is wound on one side of the iron core, and then the filling iron core one and the filling iron core two are respectively filled in the U-shaped openings of the iron core one and the iron core two, so that the iron core one and the iron core two become a hollow rectangular structure, and finally casting is performed.

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