Single-phase oil-immersed air-core reactor body structure

Abstract

The invention relates to the technical field of inductance devices, and discloses a single-phase oil-immersed air-core reactor body structure which comprises a reactor frame. The reactor frame comprises an upper pressing plate and a lower pressing plate; an inner insulating cylinder assembly, a coil and an outer insulating cylinder assembly are sequentially arranged in the upper pressing plate and the lower pressing plate from inside to outside in a sleeved mode in the radial direction, and the inner insulating cylinder assembly, the coil and the outer insulating cylinder assembly are coaxially arranged. The edges of the upper pressing plate and the lower pressing plate are connected through a plurality of non-metal connecting screws, and laminated wood nut suites are respectively arranged between the plurality of non-metal connecting screws and the upper pressing plate and between the plurality of non-metal connecting screws and the lower pressing plate; the top of the upper pressing plate makes contact with the hydraulic machine, and the hydraulic machine can press the coil through the upper pressing plate. The edges of the upper pressing plate and the lower pressing plate are connected through the multiple non-metal connecting screws, the tensile strength and the bending strength of the non-metal screws are large, and compared with metal screws, the additional loss can be reduced by 60%-90%.

Description

Technical Field

[0001] The present invention relates to the technical field of inductance devices, in particular to a single-phase oil-immersed air-core reactor body structure. Background Art

[0002] In the field of power equipment, oil-immersed air-core reactors are important reactive power compensation and current limiting devices and are widely used in various power systems. 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 primarily consists of a coil, inner and outer insulating paper tubes (skeletons), stays, upper and lower insulating end rings, an upper and lower pressure plate, metal connecting screws, and a locknut set. The inner and outer insulating paper tubes (skeletons) and stays are installed inside and outside the coil for insulation and support. Upper and lower iron yokes are installed at the upper and lower ends of the coil to ensure insulation performance. An upper pressure plate is installed above the upper iron yoke, while a lower pressure plate is installed below the lower iron yoke. The upper and lower pressure plates are connected by metal connecting screws and tightened with locknuts at both ends to compress the coil.

[0004] However, after multiple simulations and tests, the traditional oil-immersed air-core reactor body structure has the following problems that need to be solved: Traditional oil-immersed air-core reactors use metal connecting screws to connect the upper and lower pressure plates. During operation, the reactor generates a leakage magnetic field, which forms a closed path through the metal screws, causing eddy current heating and increasing reactor losses. This not only reduces the reactor's operating efficiency but can also affect its service life and safety due to localized overheating.

[0005] In the radial direction, the coils in traditional oil-immersed air-core reactors lack an iron core and rigid support, making them susceptible to displacement during operation and instability. Axially, the coils are supported by upper and lower insulating end rings, which in turn are supported by upper and lower pressure plates, but there is no fixed connection between them. When short-circuit forces act on the coils, relative vibrations may occur between them, further weakening the overall stability of the reactor and affecting its normal operation.

[0006] Traditional oil-immersed air-core reactors typically use T4 cardboard for insulation. With the rapid development of the power industry, reactor capacity continues to increase, and the short-circuit forces acting on the coils are also increasing. In this context, traditional T4 cardboard insulation has low compressive strength, and its oil and heat resistance are gradually failing to meet the reactor's long-term operational requirements. This results in reactors failing to reach their theoretical lifespan, reducing their operational reliability and increasing equipment maintenance costs and operational risks.

[0007] In summary, the traditional oil-immersed air-core reactor body structure has obvious deficiencies in terms of loss, stability and reliability. It is necessary to innovate it to improve the overall performance and operation quality of the reactor. Summary of the Invention

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

[0009] The present invention is achieved through the following technical solutions: In a first aspect, the present invention provides a single-phase oil-immersed hollow-core reactor body structure, comprising a reactor frame; the reactor frame comprises an upper pressing plate and a lower pressing plate; The upper and lower pressing plates are provided with an inner insulating cylinder assembly, a coil and an outer insulating cylinder assembly in sequence from the inside to the outside along the radial direction, wherein the inner insulating cylinder assembly, the coil and the outer insulating cylinder assembly are coaxially arranged; The edges of the upper pressing plate and the lower pressing plate are connected through a plurality of non-metallic connecting screws, wherein laminated wood nut sets are respectively provided between the plurality of non-metallic connecting screws and the upper pressing plate and the lower pressing plate; The top of the upper pressing plate contacts the hydraulic press, and the hydraulic press can press the coil tightly through the upper pressing plate.

[0010] Preferably, the inner insulating tube assembly comprises an inner support bar and an inner insulating paper tube; The inner insulating paper tube is arranged between the upper pressing plate and the lower pressing plate, and the coil is sleeved on the outer side of the inner insulating paper tube; The inner side support bar is arranged on the inner insulating paper tube in a surrounding support manner.

[0011] Preferably, the outer insulating tube assembly includes an outer support bar and an outer insulating paper tube; The outer insulating paper tube is arranged between the upper pressing plate and the lower pressing plate, and the coil is sleeved on the outside of the outer insulating paper tube; The outer support bars are arranged on the outer insulating paper tube in a surrounding support manner.

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

[0013] Preferably, the plate surface of the lower pressing plate is provided with a stepped groove; The bottoms of the inner insulating cylinder assembly and the outer insulating cylinder assembly are both clamped on the stepped groove to limit the coil width upward.

[0014] Preferably, the lower pressure plate is provided with an oil channel on the side of the plate surface coil.

[0015] Preferably, the laminated wood nut kit comprises a first locking nut and a second locking nut; The first locking nut and the second locking nut are respectively threadedly connected to 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 connection between the non-metallic connecting screw and the upper pressing plate or the lower pressing 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 material; the upper pressing plate, the lower pressing plate, the inner insulating cylinder assembly and the outer insulating cylinder assembly are made of epoxy phenolic glass cloth board 3240 material.

[0018] Preferably, the bottom of the lower pressure plate is provided with adjustment feet 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-core reactor body structure. The edges of the upper and lower pressure plates are connected by a number of non-metallic connecting screws. These screws have high tensile and bending strength, reducing parasitic losses by 60% to 90% compared to metal screws. The upper and lower pressure plates are connected by a number of non-metallic connecting screws. Laminated wood nut sets are provided between the non-metallic connecting screws and the upper and lower pressure plates, respectively, to lock and limit the coil after compression by the hydraulic press, preventing the coil from rebounding axially.

[0020] Furthermore, the surface of the lower pressure plate is provided with a stepped groove, and the bottoms of the inner insulating tube assembly and the outer insulating tube assembly are both clamped on the stepped groove, so that the inner insulating tube assembly and the outer insulating tube assembly fall into the clamping mouth when they fall above the lower pressure plate, thereby limiting the width of the reactor coil upward, and then tightening the outer insulating paper tube with a heat shrink tube, so that the coil is locked in the width direction, and the device body structure is tight and reliable to reduce vibration.

[0021] Furthermore, 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 or lower pressing plate, and the second locking nut is located on the lower side of the upper or lower pressing plate, and is used to limit the upper or lower pressing plate. The laminated wood nut kit, which includes a non-metallic connecting screw and the first and second locking nuts, can provide a stable and reliable connection between the upper and lower pressing plates. The first and second locking nuts are used to precisely limit the upper or lower pressing plate, ensuring the coaxiality and relative position accuracy between the components.

[0022] Furthermore, a metal threaded sleeve is provided between the non-metallic connecting screw and the upper or lower pressure plate. The metal threaded sleeve is secured to the non-metallic connecting screw via a pin. The metal threaded sleeve has high strength and hardness. This pin greatly enhances the connection strength between the non-metallic connecting screw and the upper or lower pressure plate. This secure connection effectively resists external forces when the reactor is subjected to vibration or impact, preventing the connection from loosening or breaking, ensuring the overall stability of the reactor structure and enhancing the reactor's vibration resistance.

[0023] Furthermore, the insulating material used in this invention, epoxy phenolic glass cloth 3240, offers superior flexural strength (typically 2-3 times that of cardboard) and impact resistance compared to traditional T4 cardboard, making it less susceptible to cracking or deformation due to vibration or electromagnetic forces. Compared to traditional cardboard, epoxy phenolic glass cloth 3240 typically has a heat resistance rating of Class B (130°C) or higher, which can withstand the temperature rise of the reactor during long-term operation (especially under high load conditions), slowing material aging and effectively improving the reliability of the device structure. The non-metallic connecting screw made of polyester laminate is 25% or more lighter than its metal counterpart. Due to its flexibility, it attenuates vibration acceleration by 40%, effectively reducing vibration in the device structure.

[0024] Furthermore, the bottom of the lower pressure plate is equipped with adjustment feet for adjusting the distance between the reactor body and the upper and lower walls of the fuel tank. These adjustment feet intelligently adjust the distance between the reactor body and the upper and lower walls of the fuel tank by increasing or decreasing their number. This allows the leakage magnetic field to gradually diffuse during propagation, reducing the magnetic flux density, thereby reducing the short-circuit force on the coil and further enhancing the stability of the reactor body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of a single-phase oil-immersed air-core reactor according to an embodiment of the present invention; Figure 2 A top view of the lower pressing plate in an embodiment of the present invention; Figure 3 A side view of the lower pressing plate in an embodiment of the present invention; Figure 4 An enlarged schematic diagram of a laminated wood nut kit according to an embodiment of the present invention; Figure 5 Schematic diagram of adjusting the footrest in an embodiment of the present invention; Figure 6 This is a cross-sectional view of an adjustment foot in an embodiment of the present invention; In the figure: 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. Adjustment foot; 12. Oil channel; 13. Pin; 14. Metal threaded sleeve; 31. Step groove; 41. First locking nut; 42. Second locking nut. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0027] The object of the present invention is to provide a single-phase oil-immersed air-core reactor body structure to solve the technical problems in the prior art of large reactor loss and insufficient vibration resistance of the traditional oil-immersed air-core reactor body structure.

[0028] The present invention is described in further detail below with reference to the accompanying drawings: See also 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 pressing plate 2 and a lower pressing plate 3; an inner insulating cylinder assembly, a coil 5 and an outer insulating cylinder assembly are sequentially sleeved in the upper pressing plate 2 and the lower pressing plate 3 along the 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 pressing plate 2 and the lower pressing plate 3 are connected through a plurality of non-metallic connecting screws 6, wherein laminated wood nut sets are respectively provided between the plurality of non-metallic connecting screws 6 and the upper pressing plate 2 and the lower pressing plate 3; the top of the upper pressing plate 2 is in contact with a hydraulic press, and the hydraulic press can press the coil 5 through the upper pressing plate 2.

[0029] Specifically, the inner insulating tube assembly includes an inner support bar 9 and an inner insulating paper tube 10; the inner insulating paper tube 10 is arranged between the upper pressing plate 2 and the lower pressing 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 on the inner insulating paper tube 10 in a surrounding support.

[0030] In this embodiment, the inner insulating paper tube 10 serves as the core insulating layer and is arranged between the upper pressing plate 2 and the lower pressing plate 3, with the coil 5 directly sleeved on its outer surface. Through physical isolation, the inner insulating paper tube 10 can block 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 usually selected from insulating paper or composite insulating materials with high dielectric strength to ensure stable insulation performance during long-term operation. The inner support bars 9 are distributed around the inner insulating paper tube 10, and the mechanical stability of the inner insulating paper tube is enhanced by a multi-point support structure. The support bars can prevent the paper tube from deforming under the action of electromagnetic force or thermal stress, and avoid local electric field concentration caused by uneven thickness of the insulation layer. The support bar material is usually a high-strength insulating material (such as epoxy glass cloth board), which takes into account both mechanical strength and insulation performance.

[0031] Specifically, the outer insulating tube assembly includes an outer support bar 7 and an outer insulating paper tube 8; the outer insulating paper tube 8 is arranged between the upper pressing plate 2 and the lower pressing 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 on the outer insulating paper tube 8 in a surrounding support.

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

[0033] Specifically, a stepped groove 31 is provided on the surface of the lower pressing plate 3 ; the bottoms of the inner insulating cylinder assembly and the outer insulating cylinder assembly are both clamped on the stepped groove 31 to limit the coil 5 upward.

[0034] In this embodiment, the stepped groove 31 achieves double limiting through step surfaces of different depths.

[0035] The bottom step supports the bottom of the inner insulation tube assembly (inner support bar 9 + inner insulation paper tube 10) and the outer insulation tube assembly to prevent axial (vertical) displacement thereof.

[0036] The sidewall step mates with the outer diameter of the insulation cylinder assembly to limit radial (horizontal) movement and ensure concentricity between coil 5 and the insulation cylinder. Radial limiting restricts coil deformation (such as expansion, contraction, or offset) in the radial plane, ensuring uniform clearance between the coil and the core and insulation cylinder.

[0037] Specifically, the lower pressing plate 3 is provided with an oil passage 12 on the side of the plate surface 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 threadedly connected to 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.

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

[0040] Among them, the material of the non-metallic connecting screw 6 is polyester laminate material; the material of the upper pressing plate 2, the lower pressing plate 3, the inner insulating cylinder assembly and the outer insulating cylinder assembly is epoxy phenolic glass cloth board 3240 material.

[0041] Specifically, an adjusting foot 11 is provided at the bottom of the lower pressing plate 3 for adjusting 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 are non-metallic spacers that intelligently adjust the distance between the reactor body and the upper and lower tank walls by increasing or decreasing their number. This reduces magnetic flux leakage into the tank walls, reduces losses, and prevents local overheating. The adjusting feet are made of epoxy phenolic glass cloth 3240 material.

[0043] In addition to the above structure, the materials of the other insulating parts, the upper pressure plate and the support bar are made of epoxy phenolic glass cloth board 3240 material, and the inner and outer insulating paper tubes are made of NFCT insulating adhesive paper tubes, which can enhance the reliability of the oil-immersed air-core reactor from the material properties.

[0044] In this embodiment, the non-metallic connecting screw is made of polyester laminate material, which is absolutely non-magnetic and can reduce additional losses by 60% to 90% compared to metal screws. Tests have shown that under normal working conditions, the non-metallic screw has excellent tensile and bending strength, but average shear strength. The specific parameters are shown in Table 1. Therefore, in order to improve the shear strength, a compression method suitable for non-metallic screws with average shear strength is proposed when compressing the body of a new oil-immersed hollow reactor. The coil is compressed by a hydraulic press through the upper pressure plate. When the body height is compressed to the theoretical height, the upper and lower pressure plates are locked and limited by the threads on the polyester laminate connecting screw using a laminated wood nut kit to prevent the coil from rebounding in the axial direction. In addition, considering the obvious magnetic field concentration phenomenon of the end winding coil of the oil-immersed reactor, the leakage magnetic field diverges here and forms a strong radial component, resulting in the concentration of electromagnetic force. Therefore, the torque distribution in the axial direction of the reactor shows the characteristics of "high at both ends and low in the middle". Therefore, in order to enhance the shear strength of the screw non-metallic connection, according to the formula τ= T⋅r / J (r is the radius, J is the polar moment of inertia), a metal threaded sleeve with an outer diameter twice the diameter of the connecting screw is installed at the junction of the connecting screw and the upper and lower pressure plates. The connecting screw and the metal threaded sleeve are fixed by three pins to form a rigid structure, such as Figure 4 Knot shown.

[0045]

[0046] Table 1 Technical performance indicators of polyester laminate screw Adjust the foot structure as Figure 5 and Figure 6 As shown, the coils support the reactor structure. During operation, the reactor coils generate a leakage magnetic field. If the coils are too close to the tank walls, a significant amount of leakage magnetic flux will enter the walls. Since the tank walls are typically ferromagnetic, eddy currents will be generated, leading to localized overheating. This not only reduces the reactor's efficiency but also may affect its insulation performance, shorten the equipment life, and even cause safety accidents. Furthermore, the leakage magnetic field may cause additional losses in metal components near the tank walls, further exacerbating heat generation issues. Adjustable feet, as non-metallic spacers, intelligently adjust the distance between the reactor body and the upper and lower tank walls by increasing or decreasing their number, thereby reducing the proportion of leakage magnetic flux entering the tank walls. On the one hand, increasing the distance gradually diffuses the leakage magnetic field during propagation, reducing the magnetic flux density and the amount of magnetic flux entering the tank walls. On the other hand, a larger distance also makes the leakage magnetic flux take a more tortuous path, reducing the likelihood of it directly entering the tank walls. This adjustment can reduce the leakage magnetic flux entering the tank walls, reducing losses and avoiding localized overheating.

[0047] The structure of the lower pressure plate is as follows Figure 2 and Figure 3 As shown, it is located below the inner and outer insulating paper tubes. Stepped grooves are provided on the sides of the base coil, allowing the inner and outer insulating paper tubes to fall into the retaining grooves when they land above the lower pressure plate, limiting the reactor coil width. Heat shrink tubing is then used to tighten the outer insulating paper tube (skeleton) to lock the coil width, securing the reactor body and reducing vibration. In the novel oil-immersed air-core reactor body structure proposed in this invention, the upper and lower ends of the coils are directly connected to the upper and lower pressure plates, simplifying the transmission of short-circuit force and effectively improving the stability of the reactor body.

[0048] The non-metallic connecting screw made of polyester laminate is 25%+ lighter than the metal screw. And because of its flexibility, the vibration acceleration is attenuated by 40%, which can effectively reduce the vibration of the device structure.

[0049] The regulating 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 can make the leakage magnetic field gradually diffuse during the propagation process, reduce the magnetic flux density, thereby reducing the short-circuit force on the coil and further enhancing the stability of the reactor body.

[0050] The insulating material used in the novel oil-immersed air-core reactor body structure proposed in this embodiment is epoxy phenolic glass cloth 3240, which offers superior flexural strength (typically 2-3 times that of cardboard) and impact resistance compared to traditional T4 cardboard. It is less susceptible to cracking or deformation due to vibration or electromagnetic forces. Furthermore, compared to traditional cardboard, epoxy phenolic glass cloth 3240 typically has a heat resistance rating of Class B (130°C) or higher, which can withstand the temperature rise of the reactor during long-term operation (especially under high-load conditions), slowing material aging and effectively improving the reliability of the 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, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by 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 comprises a reactor frame (1); the reactor frame (1) comprises an upper pressing plate (2) and a lower pressing plate (3); The upper pressing plate (2) and the lower pressing plate (3) are provided with an inner insulating cylinder assembly, a coil (5) and an outer insulating cylinder assembly in sequence along the 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 pressing plate (2) and the lower pressing plate (3) are connected through a plurality of non-metallic connecting screws (6), wherein laminated wood nut sets (4) are respectively provided between the plurality of non-metallic connecting screws (6) and the upper pressing plate (2) and the lower pressing plate (3); The top of the upper pressing plate (2) contacts the hydraulic press, and the hydraulic press can press and set the coil (5) through the upper pressing plate (2).

2. The single-phase oil-immersed air-core reactor body structure according to claim 1, characterized in that: The inner insulating tube assembly comprises an inner support bar (9) and an inner insulating paper tube (10); The inner insulating paper tube (10) is arranged between the upper pressing plate (2) and the lower pressing 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 on the inner insulating paper tube (10) in a surrounding supporting manner.

3. The single-phase oil-immersed air-core reactor body structure according to claim 1, characterized in that: The outer insulating tube assembly comprises an outer support bar (7) and an outer insulating paper tube (8); The outer insulating paper tube (8) is arranged between the upper pressing plate (2) and the lower pressing plate (3), and the coil (5) is sleeved on the outside of the outer insulating paper tube (8); The outer support bars (7) are arranged on the outer insulating paper tube (8) in a surrounding support manner.

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

5. The single-phase oil-immersed air-core reactor body structure according to claim 1, characterized in that: The plate surface of the lower pressing plate (3) is provided with a stepped groove (31); The bottoms of the inner insulating cylinder assembly and the outer insulating cylinder assembly are both clamped on the stepped groove (31) to limit the coil (5) in an upward direction.

6. The single-phase oil-immersed air-core reactor body structure according to claim 1, characterized in that: The lower pressure plate (3) is provided with an oil passage (12) on the side of the plate surface coil.

7. The single-phase oil-immersed air-core reactor body structure according to claim 1, characterized in that: The laminated wood nut kit (4) comprises a first locking nut (41) and a second locking nut (42); The first locking nut (41) and the second locking nut (42) are respectively threadedly connected to the non-metallic connecting screw (6), wherein the first locking nut (41) is located on the upper side of the upper pressing plate (2) or the lower pressing plate (3), and the second locking nut is located on the lower side of the upper pressing plate (2) or the lower pressing plate (3), and is used to limit the upper pressing plate (2) or the lower pressing plate (3).

8. The single-phase oil-immersed air-core reactor body structure according to claim 1, characterized in that: A metal threaded sleeve (14) is provided between the connection between the non-metallic connecting screw (6) and the upper pressing plate (2) or the lower pressing plate (3); the metal threaded sleeve (14) is fixed to the non-metallic connecting screw (6) via a pin (13).

9. The single-phase oil-immersed air-core reactor body structure according to claim 1, characterized in that: The non-metallic connecting screw (6) is made of polyester laminated board material; the upper pressing plate (2), the lower pressing plate (3), the inner insulating cylinder assembly and the outer insulating cylinder assembly are made of epoxy phenolic glass cloth board 3240 material.

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

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