A single-phase oil-immersed air-core reactor body structure

Abstract

This invention relates to the field of inductor technology and discloses a single-phase oil-immersed hollow reactor body structure. The structure includes a reactor frame; the reactor frame includes an upper pressure plate and a lower pressure plate; an inner insulating cylinder assembly, a coil, and an outer insulating cylinder assembly are sequentially arranged radially from the inside to the outside within the upper and lower pressure plates, wherein the inner insulating cylinder assembly, coil, and outer insulating cylinder assembly are all coaxially arranged; the edges of the upper and lower pressure plates are connected by a plurality of non-metallic connecting screws, wherein laminated wood nut kits are respectively provided between the non-metallic connecting screws and the upper and lower pressure plates; the top of the upper pressure plate contacts a hydraulic press, which can press the coil through the upper pressure plate. In this invention, the edges of the upper and lower pressure plates are connected by a plurality of non-metallic connecting screws. Non-metallic screws have high tensile and bending strength, and compared with metal screws, can reduce additional losses by 60% to 90%.

Description

Technical Field

[0001] This invention relates to the field of inductor technology, specifically to a single-phase oil-immersed air-core reactor body structure. Background Technology

[0002] In the field of power equipment, oil-immersed air-core reactors are widely used in various power systems as important reactive power compensation and current limiting devices. The design of their body structure is directly related to the performance, stability and reliability of the reactor.

[0003] The traditional oil-immersed air-core reactor structure mainly consists of a coil, inner and outer insulating paper tubes (skeleton), support bars, upper insulating end rings, lower insulating end rings, upper pressure plate, lower pressure plate, metal connecting screws, and a locking nut assembly. The inner and outer insulating paper tubes (skeleton) and support bars on the inner and outer sides of the coil provide insulation and support. Upper and lower yoke insulation is installed at the top and bottom of the coil to ensure insulation performance. An upper pressure plate is located above the upper yoke insulation, and a lower pressure plate is located below the lower yoke insulation. The upper and lower pressure plates are connected as a single unit by metal connecting screws and tightened by locking nuts at both ends to compress the coil.

[0004] However, after multiple simulations and experimental verifications, the traditional oil-immersed hollow reactor body structure has the following problems that urgently need to be solved: Traditional oil-immersed air-core reactors use metal connecting screws to connect the upper and lower pressure plates. Because the reactor generates a leakage magnetic field during operation, this leakage magnetic field can form a closed path through the metal screws, leading to eddy current heating and increased reactor losses. This not only reduces the reactor's operating efficiency but may also affect its lifespan and safety due to localized overheating.

[0005] In the radial direction, the traditional oil-immersed air-core reactor structure lacks an iron core inside the coil, resulting in a lack of rigid structural support and making the coil prone to displacement during operation, leading to insufficient stability. In the axial direction, the coil is supported by upper and lower insulated end rings, which in turn are supported by upper and lower pressure plates, but there is no fixed connection between the three. When the coil is subjected to a short-circuit force, relative vibration may occur among these three components, further weakening the overall stability of the reactor and affecting its normal operation.

[0006] Traditional oil-immersed air-core reactors typically use T4 cardboard insulation. With the rapid development of the power industry, reactor capacity is constantly increasing, and the short-circuit force on the coils is also increasing. Under these circumstances, the compressive strength of traditional T4 cardboard insulation is relatively low, and its oil resistance and heat resistance are gradually failing to meet the requirements of long-term reactor operation. This leads to reactors failing to reach their theoretical lifespan, reducing operational reliability, and increasing equipment maintenance costs and operational risks.

[0007] In summary, the traditional oil-immersed hollow reactor has significant shortcomings in terms of loss, stability, and reliability. It is necessary to innovate it to improve the overall performance and operational quality of the reactor. Summary of the Invention

[0008] In order to overcome the defects of the prior art, the purpose of this invention is to provide a single-phase oil-immersed hollow reactor body structure to solve the technical problems of high reactor loss and insufficient vibration resistance of traditional oil-immersed hollow series reactor body structures in the prior art.

[0009] This invention is achieved through the following technical solution: In a first aspect, the present invention provides a single-phase oil-immersed hollow reactor body structure, including a reactor frame; the reactor frame includes an upper pressure plate and a lower pressure plate; The upper and lower pressure plates are sequentially fitted with an inner insulating cylinder assembly, a coil, and an outer insulating cylinder assembly along the radial direction from the inside to the outside, wherein the inner insulating cylinder assembly, the coil, and the outer insulating cylinder assembly are all coaxially arranged. The edges of the upper and lower pressure plates are connected by a number of non-metallic connecting screws, wherein laminated wood nut kits are provided between the non-metallic connecting screws and the upper and lower pressure plates respectively. The top of the upper pressure plate is in contact with the hydraulic press, and the hydraulic press can press the coil through the upper pressure plate.

[0010] Preferably, the inner insulating tube assembly includes an inner support strip and an inner insulating paper tube; The inner insulating paper tube is disposed between the upper pressure plate and the lower pressure plate, and the coil is sleeved on the outside of the inner insulating paper tube; The inner support bar is arranged around and supports the inner insulating paper tube.

[0011] Preferably, the outer insulating tube assembly includes an outer support strip and an outer insulating paper tube; The outer insulating paper tube is disposed between the upper pressure plate and the lower pressure plate, and the coil is sleeved on the outside of the outer insulating paper tube; The outer support bar is arranged around and supported on the outer insulating paper tube.

[0012] Preferably, a number of non-metallic connecting screws are arranged in parallel between the upper pressure plate and the lower pressure plate.

[0013] Preferably, the surface of the lower pressure plate is provided with stepped grooves; The bottoms of both the inner and outer insulating cylinder assemblies are engaged with the stepped groove to limit the coil amplitude upward.

[0014] Preferably, the lower pressure plate has an oil passage on the side of the coil.

[0015] Preferably, the laminated wood nut kit includes a first locking nut and a second locking nut; The first locking nut and the second locking nut are respectively threaded onto the non-metallic connecting screw, wherein the first locking nut is located on the upper side of the upper pressure plate or the lower pressure plate, and the second locking nut is located on the lower side of the upper pressure plate or the lower pressure plate, and is used to limit the upper pressure plate or the lower pressure plate.

[0016] Preferably, a metal threaded sleeve is provided between the non-metallic connecting screw and the upper or lower pressure plate; the metal threaded sleeve is fixed to the non-metallic connecting screw by a pin.

[0017] Preferably, the non-metallic connecting screw is made of polyester laminate; the upper pressure plate, lower pressure plate, inner insulating cylinder assembly and outer insulating cylinder assembly are made of epoxy phenolic glass cloth 3240.

[0018] Preferably, the bottom of the lower pressure plate is provided with adjusting pads for adjusting the distance between the reactor body and the upper and lower tank walls of the oil tank.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a single-phase oil-immersed hollow reactor body structure. The edges of the upper and lower pressure plates are connected by several non-metallic connecting screws. The non-metallic screws have high tensile and bending strength, and can reduce additional losses by 60% to 90% compared with metal screws. The upper and lower pressure plates are connected by several non-metallic connecting screws, and laminated wood nut kits are respectively provided between the non-metallic connecting screws and the upper and lower pressure plates, which can lock and limit the coil after being compressed by a hydraulic press to prevent the coil from rebounding axially.

[0020] Furthermore, the lower pressure plate has stepped grooves on its surface. The bottoms of the inner and outer insulation cylinder assemblies are both snapped into the stepped grooves, so that when the inner and outer insulation cylinder assemblies fall above the lower pressure plate, they fall into the slots, limiting the radial movement of the reactor coil. In addition, heat shrink tubing is used to tighten the outer insulation paper tube, so that the coil is locked in the radial direction, making the reactor body structure firm and reliable and reducing vibration.

[0021] Furthermore, the laminated wood nut kit includes a first locking nut and a second locking nut; the first and second locking nuts are threaded onto a non-metallic connecting screw, with the first locking nut located on the upper or lower pressure plate and the second locking nut located on the lower side of the upper or lower pressure plate, used to limit the movement of the upper or lower pressure plate. The laminated wood nut kit, with its non-metallic connecting screw and the first and second locking nuts, provides a stable and reliable connection between the upper and lower pressure plates. The precise limiting of the upper or lower pressure plate by the first and second locking nuts ensures the coaxiality and relative position accuracy between the components.

[0022] Furthermore, a metal threaded sleeve is provided at the connection between the non-metallic connecting screw and the upper or lower pressure plate. The metal threaded sleeve is fixed to the non-metallic connecting screw by a pin. The metal threaded sleeve has high strength and hardness, and its fixation to the non-metallic connecting screw by the pin greatly enhances the connection strength between the non-metallic connecting screw and the upper or lower pressure plate. When the reactor is subjected to vibration or impact, this robust connection effectively resists external forces, preventing loosening or breakage at the connection point, ensuring the overall stability of the reactor structure, and enhancing the reactor's vibration resistance.

[0023] Furthermore, compared to traditional T4 cardboard, the epoxy phenolic glass cloth 3240 material used for the insulation components in this invention exhibits superior bending strength (typically 2-3 times that of cardboard) and impact resistance, making it less prone to cracking or deformation due to vibration or electromagnetic forces. Compared to traditional cardboard materials, epoxy phenolic glass cloth 3240 typically has a heat resistance rating of Class B (130℃) or higher, allowing it to withstand the temperature rise during long-term reactor operation (especially under high load conditions), delaying material aging and effectively improving the reliability of the reactor structure. The polyester laminate non-metallic connecting screws reduce overall weight by 25%+ compared to metal screws, and due to their flexibility, vibration acceleration is attenuated by 40%, effectively reducing vibration in the reactor structure.

[0024] Furthermore, the bottom of the lower pressure plate is equipped with adjusting feet for adjusting the distance between the reactor body and the upper and lower walls of the oil tank. The adjusting feet intelligently adjust the distance between the reactor body and the upper and lower walls of the oil tank by increasing or decreasing their number. This allows the leakage magnetic field to gradually diffuse during propagation, reducing the magnetic flux density and thus decreasing the short-circuit force on the coil, further enhancing the stability of the reactor body. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the body structure of a single-phase oil-immersed air-core reactor in an embodiment of the present invention; Figure 2 This is a top view of the lower pressure plate in an embodiment of the present invention; Figure 3 This is a side view of the lower pressure plate in an embodiment of the present invention; Figure 4 This is an enlarged schematic diagram of the laminated wood nut kit in an embodiment of the present invention; Figure 5 This is a schematic diagram of the adjustable feet in an embodiment of the present invention; Figure 6 This is a cross-sectional view of the adjusting pad in an embodiment of the present invention; In the diagram: 1. Reactor frame; 2. Upper pressure plate; 3. Lower pressure plate; 4. Laminated wood nut kit; 5. Coil; 6. Non-metallic connecting screw; 7. Outer support bar; 8. Outer insulating paper tube; 9. Inner support bar; 10. Inner insulating paper tube; 11. Adjusting pad; 12. Oil passage; 13. Pin; 14. Metal threaded sleeve; 31. Stepped groove; 41. First locking nut; 42. Second locking nut. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0027] The purpose of this invention is to provide a single-phase oil-immersed air-core reactor body structure to solve the technical problems of high reactor losses and insufficient vibration resistance in the traditional oil-immersed air-core reactor body structure.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 1 In one embodiment of the present invention, a single-phase oil-immersed hollow reactor body structure is provided, including a reactor frame 1; the reactor frame 1 includes an upper pressure plate 2 and a lower pressure plate 3; an inner insulating cylinder assembly, a coil 5, and an outer insulating cylinder assembly are sequentially sleeved radially from the inside to the outside of the upper pressure plate 2 and the lower pressure plate 3, wherein the inner insulating cylinder assembly, the coil 5, and the outer insulating cylinder assembly are all coaxially arranged; the edges of the upper pressure plate 2 and the lower pressure plate 3 are connected by a plurality of non-metallic connecting screws 6, wherein laminated wood nut kits are respectively provided between the plurality of non-metallic connecting screws 6 and the upper pressure plate 2 and the lower pressure plate 3; the top of the upper pressure plate 2 is in contact with a hydraulic press, and the hydraulic press can press the coil 5 through the upper pressure plate 2.

[0029] Specifically, the inner insulating tube assembly includes an inner support strip 9 and an inner insulating paper tube 10; the inner insulating paper tube 10 is disposed between the upper pressure plate 2 and the lower pressure plate 3, and the coil 5 is sleeved on the outside of the inner insulating paper tube 10; the inner support strip 9 is arranged around and supported on the inner insulating paper tube 10.

[0030] In this embodiment, the inner insulating paper tube 10 serves as the core insulating layer, positioned between the upper pressure plate 2 and the lower pressure plate 3, with the coil 5 directly sleeved on its outer surface. Through physical isolation, the inner insulating paper tube 10 blocks the electrical connection between the coil and the iron core or other conductive components, preventing the risk of high-voltage breakdown or short circuit. Its material is typically high-dielectric-strength insulating paper or composite insulating material to ensure stable insulation performance during long-term operation. Inner support strips 9 are distributed around the inner insulating paper tube 10, enhancing its mechanical stability through a multi-point support structure. The support strips prevent deformation of the paper tube under electromagnetic force or thermal stress, avoiding localized electric field concentration caused by uneven insulation layer thickness. The support strip material is typically a high-strength insulating material (such as epoxy glass cloth), balancing mechanical strength and insulation performance.

[0031] Specifically, the outer insulating tube assembly includes an outer support strip 7 and an outer insulating paper tube 8; the outer insulating paper tube 8 is disposed between the upper pressure plate 2 and the lower pressure plate 3, and the coil 5 is sleeved on the outside of the outer insulating paper tube 8; the outer support strip 7 is arranged around and supported on the outer insulating paper tube 8.

[0032] Among them, several non-metallic connecting screws 6 are arranged in parallel between the upper pressure plate 2 and the lower pressure plate 3.

[0033] Specifically, the lower pressure plate 3 has a stepped groove 31 on its surface; the bottoms of the inner insulation cylinder assembly and the outer insulation cylinder assembly are both engaged with the stepped groove 31 to limit the upward movement of the coil 5.

[0034] In this embodiment, the stepped groove 31 achieves dual limiting through steps of different depths.

[0035] The bottom step supports the bottom of the inner insulating cylinder assembly (inner support bar 9 + inner insulating paper tube 10) and the outer insulating cylinder assembly, preventing their axial (vertical) displacement.

[0036] The side wall step matches the outer diameter of the insulating cylinder assembly, limiting radial (horizontal) sway and ensuring the concentricity of coil 5 and the insulating cylinder. The radial limit refers to limiting the deformation of the coil in the radial plane (such as expansion, contraction, or offset), ensuring that its gap with the iron core and the insulating cylinder is uniform.

[0037] Specifically, the lower pressure plate 3 has an oil passage 12 on the side of the plate coil.

[0038] Specifically, the laminated wood nut kit includes a first locking nut 41 and a second locking nut 42; the first locking nut 41 and the second locking nut 42 are respectively threaded onto the non-metallic connecting screw 6, wherein the first locking nut 41 is located on the upper side of the upper pressure plate 2 or the lower pressure plate 3, and the second locking nut is located on the lower side of the upper pressure plate 2 or the lower pressure plate 3, for limiting the upper pressure plate 2 or the lower pressure plate 3.

[0039] A metal threaded sleeve 14 is provided between the non-metallic connecting screw 6 and the upper pressure plate 2 or the lower pressure plate 3; the metal threaded sleeve 14 is fixed to the non-metallic connecting screw 6 by a pin 13.

[0040] The non-metallic connecting screw 6 is made of polyester laminate; the upper pressure plate 2, lower pressure plate 3, inner insulating cylinder assembly and outer insulating cylinder assembly are made of epoxy phenolic glass cloth 3240.

[0041] Specifically, the bottom of the lower pressure plate 3 is provided with an adjusting pad 11, which is used to adjust the distance between the reactor body and the upper and lower tank walls of the oil tank.

[0042] In this embodiment, the adjusting feet 11, as a type of non-metallic pad, can intelligently adjust the distance between the reactor body and the upper and lower walls of the oil tank by increasing or decreasing their number. This reduces leakage flux entering the tank walls, reduces losses, and avoids localized overheating. The adjusting feet are made of epoxy phenolic glass cloth 3240 material.

[0043] In addition to the above structure, the other insulating components, such as the pressure plate and support strip, are made of epoxy phenolic glass cloth board 3240, and the inner and outer insulating paper tubes are made of NFCT insulating paper tubes. All of these materials can enhance the reliability of the oil-immersed air reactor from the perspective of material properties.

[0044] In this embodiment, the non-metallic connecting screw is made of polyester laminate, which is absolutely non-magnetic. Compared with metal screws, it can reduce additional losses by 60% to 90%. Tests have verified that under normal operating conditions, the non-metallic screw has excellent tensile and bending strength, but its shear strength is generally weak, as shown in Table 1. Therefore, to improve shear strength, a clamping method suitable for non-metallic screws with moderate shear strength is proposed when clamping the body of the new oil-immersed hollow reactor. A hydraulic press is used to clamp the coil through the upper pressure plate. When the body height is compressed to the theoretical height, a laminated wood nut kit is used to lock and limit the upper and lower pressure plates through the threads on the polyester laminate connecting screw to prevent the coil from rebounding axially. In addition, considering the significant magnetic field concentration phenomenon of the end winding coil of the oil-immersed reactor, the leakage magnetic field diverges at this point and forms a strong radial component, leading to electromagnetic force concentration. Therefore, the torque distribution in the reactor axial direction exhibits a characteristic of "high at both ends and low in the middle". Therefore, to enhance the shear strength of the non-metallic connection screw, according to the formula τ = T⋅r / J (where r is the radius and J is the polar moment of inertia), a metal threaded sleeve with an outer diameter twice the diameter of the connecting screw is fitted at the joint between the connecting screw and the upper and lower pressure plates. The connecting screw and the metal threaded sleeve are fixed together by three pins to form a rigid structure, such as... Figure 4 The knot shown.

[0045]

[0046] Table 1 Technical Performance Indicators of Polyester Laminate Screws Adjustable foot structure, such as Figure 5 and Figure 6 As shown, these are used to support the reactor body structure. During reactor operation, the coil generates a leakage magnetic field. If the coil is too close to the tank wall, a significant amount of leakage flux will enter the tank wall. Since the tank wall is typically made of ferromagnetic material, eddy currents will be generated within it, leading to localized overheating. This not only reduces the reactor's efficiency but may also affect its insulation performance, shorten equipment lifespan, and even cause safety accidents. Furthermore, the leakage magnetic field may generate additional losses in the metal components near the tank wall, further increasing the heat generation problem. Adjustable feet, as non-metallic pads, can intelligently adjust the distance between the reactor body and the upper and lower tank walls by increasing or decreasing their number, thus reducing the proportion of leakage flux entering the tank wall. On one hand, increased distance causes the leakage magnetic field to gradually diffuse during propagation, reducing the magnetic flux density and decreasing the amount of magnetic flux entering the tank wall; on the other hand, a larger distance also makes the leakage flux path more tortuous, reducing the possibility of direct entry into the tank wall. This adjustment can reduce leakage flux entering the tank wall, reduce losses, and avoid localized overheating.

[0047] The lower pressure plate structure is as follows Figure 2 and Figure 3 As shown, it is positioned below the inner and outer insulating paper tubes. A stepped groove is provided on the side of the coil on the base plate, allowing the inner and outer insulating paper tubes to fall into the slots when they rest above the lower pressure plate, limiting the radial direction of the reactor coil. Heat shrink tubing is then used to tighten the outer insulating paper tube (skeleton), locking the coil radially and ensuring a robust and reliable reactor structure that reduces vibration. In the novel oil-immersed hollow reactor structure proposed in this invention, the upper and lower ends of the coil are directly set as upper and lower pressure plates, simplifying the transmission of short-circuit forces and effectively improving the stability of the reactor structure.

[0048] Compared to metal screws, non-metallic connecting screws made of polyester laminate are 25%+ lighter overall, and because of their flexibility, they have a 40% reduction in vibration acceleration, which can effectively reduce the vibration of the device structure.

[0049] The adjustable feet intelligently adjust the distance between the reactor body and the upper and lower walls of the oil tank by increasing or decreasing their number. This allows the leakage magnetic field to gradually diffuse during propagation, reducing the magnetic flux density and thus decreasing the short-circuit force on the coil, further enhancing the stability of the reactor body.

[0050] In this embodiment, the insulating material of the novel oil-immersed hollow reactor body structure, compared to traditional T4 cardboard, features epoxy phenolic glass cloth 3240 material with superior bending strength (typically 2-3 times that of cardboard) and impact resistance, making it less prone to cracking or deformation due to vibration or electromagnetic forces. Furthermore, compared to traditional cardboard materials, epoxy phenolic glass cloth 3240 material typically has a heat resistance rating of Class B (130℃) or higher, allowing it to withstand temperature rise during long-term reactor operation (especially under high load conditions), delaying material aging and effectively improving the reliability of the reactor body structure.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A single-phase oil-immersed air-core reactor body structure, characterized in that, It includes a reactor frame (1); the reactor frame (1) includes an upper pressure plate (2) and a lower pressure plate (3); The upper pressure plate (2) and the lower pressure plate (3) are fitted with an inner insulating cylinder assembly, a coil (5) and an outer insulating cylinder assembly in a radial direction from the inside to the outside, wherein the inner insulating cylinder assembly, the coil (5) and the outer insulating cylinder assembly are all coaxially arranged; The edges of the upper pressure plate (2) and the lower pressure plate (3) are connected by a number of non-metallic connecting screws (6), wherein laminated wood nut kits (4) are respectively provided between the number of non-metallic connecting screws (6) and the upper pressure plate (2) and the lower pressure plate (3). The top of the upper pressure plate (2) is in contact with the hydraulic press, and the hydraulic press can press the coil (5) through the upper pressure plate (2); The surface of the lower pressure plate (3) is provided with a stepped groove (31); The bottoms of both the inner and outer insulating cylinder assemblies are engaged in the stepped groove (31) to limit the amplitude of the coil (5); The laminated wood nut kit (4) includes a first locking nut (41) and a second locking nut (42); The first locking nut (41) and the second locking nut (42) are respectively threaded onto the non-metallic connecting screw (6), wherein the first locking nut (41) is located on the upper side of the upper pressure plate (2) or the lower pressure plate (3), and the second locking nut is located on the lower side of the upper pressure plate (2) or the lower pressure plate (3), and is used to limit the upper pressure plate (2) or the lower pressure plate (3); A metal threaded sleeve (14) is provided between the non-metallic connecting screw (6) and the upper pressure plate (2) or the lower pressure plate (3); the metal threaded sleeve (14) is fixed to the non-metallic connecting screw (6) by a pin (13); The non-metallic connecting screw (6) is made of polyester laminate; the upper pressure plate (2), lower pressure plate (3), inner insulating cylinder assembly and outer insulating cylinder assembly are made of epoxy phenolic glass cloth 3240.

2. The structure of a single-phase oil-immersed air-core reactor according to claim 1, characterized in that, The inner insulating tube assembly includes an inner support strip (9) and an inner insulating paper tube (10). The inner insulating paper tube (10) is disposed between the upper pressure plate (2) and the lower pressure plate (3), and the coil (5) is sleeved on the outside of the inner insulating paper tube (10); The inner support bar (9) is arranged around and supported on the inner insulating paper tube (10).

3. The structure of a single-phase oil-immersed air-core reactor according to claim 1, characterized in that, The outer insulating tube assembly includes an outer support strip (7) and an outer insulating paper tube (8). The outer insulating paper tube (8) is disposed between the upper pressure plate (2) and the lower pressure plate (3), and the coil (5) is sleeved on the outside of the outer insulating paper tube (8); The outer support bar (7) is arranged around and supported on the outer insulating paper tube (8).

4. The structure of a single-phase oil-immersed air-core reactor according to claim 1, characterized in that, Several non-metallic connecting screws (6) are arranged in parallel between the upper pressure plate (2) and the lower pressure plate (3).

5. The structure of a single-phase oil-immersed air-core reactor according to claim 1, characterized in that, The lower pressure plate (3) has an oil passage (12) on the side of the plate coil.

6. The structure of a single-phase oil-immersed air-core reactor according to claim 1, characterized in that, The bottom of the lower pressure plate (3) is provided with an adjusting pad (11) for adjusting the distance between the reactor body and the upper and lower tank walls of the oil tank.

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