Oil-immersed iron core reactor upper portion pressing and positioning system design method and system

Abstract

The invention discloses a design method and system for an oil-immersed iron core reactor upper portion pressing and positioning system, and belongs to the technical field of reactors. By adopting the constant-pressure structural design of the belleville springs and the positioning bowls, a flexible buffer space in the vertical direction is formed, mechanical vibration and noise caused by changes of attractive force between iron core cakes are effectively reduced, meanwhile, the overall height of the system is optimized, the equipment transportation cost is reduced, and the transportation flexibility is improved; besides, additional noise generated by vibration of a traditional positioning cylinder is avoided, reliability and adaptability of system operation are enhanced, and an efficient and stable solution is provided for design and application of high-voltage and extra-high-voltage reactors.

Description

Technical Field

[0001] The present application relates to the technical field of reactors, and in particular to a design method and system for an upper compression and positioning system of an oil-immersed iron core reactor. Background Art

[0002] With the rapid development of my country's ultra-high voltage and UHV AC and DC power grids, the voltage level and capacity of iron core shunt reactors are constantly rising, and the technical requirements are increasing. However, with the development of large-capacity and high-voltage oil-immersed shunt iron core reactors, the noise pollution problem has gradually become prominent and has become one of the global problems that need to be solved urgently. In addition, the transportation of reactors also faces many challenges, especially in the context of the size of UHV reactors approaching the transportation limit, the transportation cost and difficulty are constantly increasing.

[0003] In 2023, State Grid, together with relevant manufacturers, universities and the Institute of Electrical Engineering, launched a scientific research project on vibration reduction and noise reduction, proposing to reduce the noise level of UHV reactors of 240,000 kvar and below to below 64 dB (A), while the IEC standard limit is 85 dB (A). This goal is undoubtedly forward-looking and challenging, and there are currently no mature technical cases for reference. In addition, the existing UHV iron core shunt reactor products (such as BKD-240000 / 1000-145) are close to the limit in height during transportation, with a maximum transportation height of 4980 mm, a highway height limit of 5000 mm, and a railway height limit of 4800 mm. In order to ensure smooth passage through facilities such as overpasses, unconventional means such as deflated tires, manual traction, facility modification, and the selection of special transport vehicles are usually required, which greatly increases transportation costs and time.

[0004] Therefore, the optimization design of iron core shunt reactors has become an important topic at present. On the one hand, through innovative design and process improvement, the overall transportation height of the reactor can be further reduced, fundamentally reducing the difficulty and cost of transportation; on the other hand, through the research and optimization of the noise source of the reactor, effective vibration reduction and noise reduction can be achieved to improve product performance. In addition, size optimization will also provide greater flexibility and optimization space for the design of other parameters of the reactor, thereby promoting the stable and efficient development of ultra-high voltage and ultra-high voltage power grids. Summary of the invention

[0005] The embodiment of the present application provides a design method and system for the upper compression and positioning system of an oil-immersed iron core reactor. The technical solution is as follows:

[0006] According to one aspect of the present application, a system for pressing and positioning the upper part of an oil-immersed iron core reactor is provided, the system comprising a body of the oil-immersed iron core reactor, a constant pressure structure, a positioning structure, an oil tank structure and a lifting system;

[0007] The lifting system is connected to the constant pressure structure, and the oil tank structure is connected to the constant pressure structure;

[0008] The constant pressure structure is provided with a positioning bowl and a disc spring placed in the positioning bowl to form a vertical constant pressure movement space, and the system height is lowered and adjusted under the action of the vertical constant pressure movement space.

[0009] Optionally, the body includes a coil 1 , an iron core 2 and an insulating member 3 , wherein the coil 1 is arranged around the iron core 2 , and the insulating member 3 is located above the coil 1 .

[0010] Optionally, the constant pressure structure includes, in addition to the disc spring 9 and the positioning bowl 11, a pressure beam 7, a cross beam 8, a pull screw 10, a first positioning member 12, a second positioning member 13 and a third positioning member 14;

[0011] The disc spring 9 is placed in the positioning bowl 11 to form a constant pressure vertical movement space.

[0012] Optionally, the lifting system includes a lifting seat 15 for transport positioning.

[0013] Optionally, the oil tank structure includes a tank bottom 4, a tank cover 5 and a tank wall 6, wherein the tank cover 5 is buckled on the tank wall 6 and is used to seal the oil tank, the tank wall 6 is arranged around the body, and the tank bottom 4 is arranged at the lower part of the tank wall 6 and is connected;

[0014] The box cover 4 is connected to the transport positioning lifting seat 15, and the box cover 4 is opened and closed under the lifting system.

[0015] Optionally, the system further includes a press pin 16 , a core cake 17 and a core column 18 formed by the core cake 17 .

[0016] Optionally, the upper compression and positioning system of the oil-immersed iron core reactor is suitable for voltages of 330 kV and above.

[0017] On the other hand, a design method for an upper compression and positioning system of an oil-immersed iron core reactor is provided, the method being used for the upper compression and positioning system of the oil-immersed iron core reactor described above, the method comprising:

[0018] Obtain the effective cross-sectional area A of the core column and the magnetic induction intensity B in the core cake, and calculate the electromagnetic force F1 between the core cakes, which can be expressed as

[0019] The pressure F of the butterfly spring is calculated as F1+Gg, where G is the weight of the oil-immersed iron core reactor;

[0020] Determine the specification of a single butterfly spring according to the pressure F of the butterfly spring;

[0021] The structural dimensions of the positioning bowl are determined according to the specifications of the single butterfly spring.

[0022] Optionally, the constant pressure structure includes, in addition to the disc spring and the positioning bowl, a first positioning member, a second positioning member and a third positioning member, wherein the second positioning member includes thread structures of three specifications; the method further includes:

[0023] The thread structure of the second positioning member is changed to thread structures of two specifications, and the thread structures of the two specifications are nut structures with internal threads and external threads.

[0024] In an embodiment of the present application, a compression and positioning system for the upper part of an oil-immersed iron core reactor is provided. By adopting a constant pressure structure design of a disc spring and a positioning bowl, a flexible buffer space in the vertical direction is formed, which effectively reduces the mechanical vibration and noise caused by changes in the attraction between the core disks, while optimizing the overall height of the system, reducing the equipment transportation cost and improving the transportation flexibility; in addition, the structure avoids the additional noise generated by the vibration of the traditional positioning cylinder, enhances the reliability and adaptability of the system operation, and provides an efficient and stable solution for the design and application of high-voltage and ultra-high-voltage reactors. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the upper pressing system of the reactor of the present invention;

[0026] Figure 2 It is a schematic diagram of the upper part pressing and positioning system of the reactor main column of the present invention;

[0027] Figure 3 It is a schematic diagram of the positioning bowl structure of the present invention;

[0028] Figure 4 It is a schematic diagram of disc spring parameters suitable for upper positioning, ultra-high voltage reactors, and ultra-large capacity ultra-high voltage reactors. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0030] The term "multiple" as used herein refers to two or more than two. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0031] Example 1

[0032] Please refer to Figure 1 , which shows a schematic structural diagram of an upper pressing and positioning system for an oil-immersed iron core reactor provided in an illustrative embodiment of the present application.

[0033] The system includes a body of an oil-immersed iron core reactor, a constant voltage structure, a positioning structure, an oil tank structure and a lifting system.

[0034] The lifting system is connected to the constant pressure structure, and the oil tank structure is connected to the constant pressure structure;

[0035] The constant pressure structure is provided with a positioning bowl and a disc spring placed in the positioning bowl to form a vertical constant pressure movement space, and the system height is lowered and adjusted under the action of the vertical constant pressure movement space.

[0036] Optionally, the main body includes a coil 1 , an iron core 2 and an insulating member 3 , wherein the coil 1 is arranged around the iron core 2 , and the insulating member 3 is located above the coil 1 .

[0037] Optionally, the constant pressure structure includes, in addition to the disc spring 9 and the positioning bowl 11 , a pressure beam 7 , a cross beam 8 , a pull screw 10 , a first positioning member 12 , a second positioning member 13 and a third positioning member 14 .

[0038] The disc spring 9 is placed in the positioning bowl 11 to form a constant pressure vertical movement space. In this application, the limiting method of the butterfly spring 9 is optimized and improved, and the original limiting cylinder on the inner diameter side of the butterfly spring is changed to external limiting, that is, the butterfly spring 9 is placed in the positioning bowl 11, and the bottom of the positioning bowl 11 is always pressed by the butterfly spring 9, which limits the movement of the entire pressure pin 16 bowl. The limiting cylinder of the traditional structure is in a free state on the inner diameter side of the butterfly spring, which will produce large vibrations, especially when the butterfly spring is compressed. The amplitude and noise are greater. The present invention can effectively limit the bottom and circumferential direction of the butterfly spring 9 through the positioning bowl 11, and the butterfly is pressed and fixed in real time, so it has very important engineering practice value for reducing the noise here, ensuring structural stability, and ensuring that the butterfly spring is in the best compression state.

[0039] In addition, in addition to the positioning bowl playing a role in direct compression and noise reduction, the pressure beam 7, cross beam 8, pull screw 10, first positioning member 12, second positioning member 13 and third positioning member 14 in the constant pressure structure play a role in assisting the compact structure.

[0040] Further, the lifting system includes a transport positioning lifting seat 15. The height of the lifting seat is closely related to the height of the entire reactor, and is located at the highest point of the reactor. Lowering it is equivalent to lowering the height of the entire reactor.

[0041] It should be noted that the overall height of the lifting seat 15 is determined by the second positioning member 13. Due to the constant pressure structure, the height of the second positioning member 13 is reduced, and compared with the height of the lifting seat in the related art, its overall height is reduced.

[0042] Optionally, the oil tank structure includes a tank bottom 4, a tank cover 5 and a tank wall 6, wherein the tank cover 5 is buckled on the tank wall 6 and is used to seal the oil tank, the tank wall 6 is arranged around the main body, and the tank bottom 4 is arranged at the lower part of the tank wall 6 and is connected.

[0043] The box cover 4 is connected to the lifting seat 15 for transportation and positioning, and the box cover 4 is opened and closed under the lifting system.

[0044] Optionally, the system further includes a press pin 16 , a core cake 17 and a core column 18 formed by the core cake 17 .

[0045] Optional, oil-immersed iron core reactor upper clamping and positioning system is suitable for voltages of 330kV and above.

[0046] In summary, the embodiments of the present application have the following technical effects.

[0047] Vertical movement space brought by constant pressure structure: through the synergistic effect of disc springs and positioning bowls, elastic buffering is formed in the vertical direction, reducing the mechanical vibration and noise caused by the periodic changes in the attraction between the core discs. Compared with the traditional rigid structure, the noise is reduced by more than 10%, and the mechanical vibration amplitude is reduced by 15% to 20%. The flexible design of the constant pressure structure also reduces the conduction of high-frequency vibration to other parts of the equipment, further improving the operational reliability of the equipment.

[0048] Effect of reducing system height: Through the design and optimization of the limit bowl, the butterfly spring reduces the overall height of the upper positioning system while maintaining the optimal compression ratio. The transportation height is reduced by 50 to 100 mm, which not only improves transportation flexibility, but also provides greater design freedom for capacity expansion of equipment in high voltage and ultra-high voltage levels.

[0049] System reliability: The improved positioning piece structure avoids the additional noise caused by the vibration of the positioning tube. At the same time, by accurately calculating the pressure range of the butterfly spring, the stability of constant pressure positioning is ensured, which improves the system operation reliability by more than 15%.

[0050] Example 2

[0051] On the other hand, a design method for an upper compression and positioning system of an oil-immersed iron core reactor is provided. The method is used for the upper compression and positioning system of the oil-immersed iron core reactor, and the method comprises:

[0052] Step 101, obtain the effective cross-sectional area A of the core column and the magnetic induction intensity B in the core cake, and calculate the electromagnetic force F1 between the core cakes, which is recorded as

[0053] Step 102, calculating the pressure F of the butterfly spring as F1+Gg, wherein G is the body weight of the oil-immersed iron core reactor.

[0054] Step 103, determining the specification of a single butterfly spring according to the pressure F of the butterfly spring.

[0055] Step 104, determining the structural dimensions of the positioning bowl according to the specifications of a single butterfly spring.

[0056] In a possible implementation, firstly, based on the effective cross-sectional area A of the core column and the magnetic induction intensity B in the core cake, the electromagnetic force F1 between the core cakes is calculated. The weight of the reactor body is G, and the pressure of the butterfly spring 9 on the main column of the iron core reactor is F = F1 + Gg. Secondly, according to the required total pressure F of the butterfly spring 9, the specification of a single butterfly spring 9 is determined, and usually two stacks and two strings of four disc springs of the same specification are used. And according to the specifications of the butterfly spring 9, the inner diameter and other structural dimensions of the positioning bowl 11 are determined.

[0057] In addition to the disc spring and the positioning bowl, the constant pressure structure also includes a first positioning member, a second positioning member and a third positioning member, wherein the second positioning member includes three specifications of thread structures. In a possible implementation, the thread structure of the second positioning member is changed to a thread structure of two specifications, and the two specifications of the thread structure are nut structures with internal threads and external threads.

[0058] That is, the second positioning member 13 is finally changed from the original thread structure containing three specifications to a thread structure containing two specifications, similar to a nut structure with both internal and external threads, and is transported and operated together with the product. The original structure is only used when the product body is press-fitted, and after the press-fitting is completed, it is replaced with a new positioning structure, namely the first positioning member 12.

[0059] For example, when the invention is applied to a single-phase iron core reactor, the basic structure of the iron core 2 is a "U"-shaped iron yoke with a core column in the middle, and two pressure beams 7 and a cross beam 8 at the upper end. The product has a total of 1 set of the connection system of the present invention, such as Figure 1 shown.

[0060] The following are examples of analysis and calculation. It should be noted that the units of the following geometric dimensions are mm.

[0061] In one possible implementation, the product is of standardized design, and several specifications of disc springs are designed in advance according to different capacity specifications. They can be used individually or in combination. The combination means that the number of parallel connections can be adjusted to change the pressure by multiples, and the number of series connections can be adjusted to change the total stroke by multiples. The disc springs used are non-standard parts specially designed according to specific needs as an example.

[0062] like Figure 4 The diagram shown is a schematic diagram of disc spring parameters applicable to upper positioning, ultra-high voltage reactors, and ultra-large capacity ultra-high voltage reactors.

[0063] The disc spring 9 provides different forces when the stroke is compressed. It has the best performance when the maximum stroke is compressed by about 70% and cannot be flattened. In this way, the specifications of the disc spring 9 can be determined. Figure 4 As shown, 4 disc springs are connected in parallel with 2 discs, and the stroke is compressed by 70%.

[0064] Pressure F = 1168061N = 119190kgf, positive pressure N = F + G = 119190 + 98000 = 217190kgf, wherein the inner diameter of the disc spring is 102.0 and the outer diameter is 250; after 70% compression of two discs in parallel, the height is 86 and the outer diameter is 243.2. Based on this, the positioning bowl 11 is designed.

[0065] The patent of this invention has low noise, high reliability, effective positioning, and can reduce the transportation size, simple structure and process. The positioning system between the upper part of the body and the box cover is suitable for the structural design of oil-immersed iron core shunt reactors with voltage levels of 330kV and above.

[0066] The patent of the present invention first calculates the electromagnetic force between the core cakes based on the magnetic flux density of the shunt reactor under rated operating conditions; then repeatedly considers the pressing force of the device body to calculate the long-term working load required by the butterfly spring. According to the long-term load of the butterfly spring and the optimal working load range of the butterfly spring (deformation of about 70%), the specifications and quantity of the butterfly spring are further determined. Secondly, by reasonably designing the limit bowl of the butterfly spring, the purpose of reducing noise is achieved. Finally, by improving the positioning part structure and operation method between the upper part of the device body and the box cover, the purpose of reducing the product transportation height is achieved, and the requirements of the tooling required for the device body compression are met. The patent of the present invention has a positioning system between the upper part of the device body and the box cover with low noise, high reliability, effective positioning, and can reduce the transportation size, simple structure and process. This structure is suitable for the structural design of grade oil-immersed iron core shunt reactors.

[0067] In summary, the embodiments of the present application have the following technical effects.

[0068] Improved calculation method: The calculation method based on the cross-sectional area of ​​the core column and the magnetic induction intensity optimizes the selection of butterfly springs and pressure distribution, ensures the stability of the system in long-term operation, and extends the overall life of the equipment by 10% to 15%.

[0069] Effect of optimization of the positioning piece structure: The second positioning piece was changed from three thread specifications to a nut structure with two specifications, which reduced installation complexity, improved assembly efficiency, shortened the manufacturing cycle, and reduced costs by 5% to 8%.

[0070] The effect of combining transportation and operation: The design of the lifting seat for transportation positioning in the lifting system allows the box cover to be opened and closed quickly. The equipment structure is more stable during transportation, effectively avoiding vibration damage and further reducing transportation risks.

[0071] Effect of standardized design: Through standardized design of butterfly springs of various specifications, users can flexibly adjust the clamping force and total stroke according to different capacity requirements, which enhances the versatility of design and production and provides the possibility for mass production.

[0072] An embodiment of the present application also provides a computer-readable medium storing at least one instruction, wherein the at least one instruction is loaded and executed by the processor to implement the design method of the upper compression and positioning system of the oil-immersed iron core reactor as described in the above embodiments.

[0073] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An oil-immersed iron core reactor upper pressing and positioning system, characterized in that: The system includes a body of an oil-immersed iron core reactor, a constant voltage structure, a positioning structure, an oil tank structure and a lifting system; The lifting system is connected to the constant pressure structure, and the oil tank structure is connected to the constant pressure structure; The constant pressure structure is provided with a positioning bowl and a disc spring placed in the positioning bowl to form a vertical constant pressure movement space, and the system height is lowered and adjusted under the action of the vertical constant pressure movement space.

2. The system according to claim 1, characterized in that The body comprises a coil, an iron core and an insulating member, wherein the coil is arranged around the iron core and the insulating member is located above the coil.

3. The system according to claim 1, characterized in that In addition to the disc spring and the positioning bowl, the constant pressure structure also includes a pressure beam, a cross beam, a pull screw, a first positioning member, a second positioning member and a third positioning member; The disc spring is placed in the positioning bowl to form a constant pressure vertical movement space.

4. The system according to claim 1, characterized in that The lifting system comprises a lifting seat for transport positioning.

5. The system according to claim 4, characterized in that The oil tank structure comprises a tank bottom, a tank cover and a tank wall, wherein the tank cover is buckled on the tank wall and is used to seal the oil tank, the tank wall is arranged around the body, and the tank bottom is arranged at the lower part of the tank wall and is connected; The box cover is connected to the transport positioning lifting seat, and the box cover is opened and closed under the lifting system.

6. The system according to claim 4, characterized in that The system further comprises a press pin, a core cake and a core column formed by the core cake.

7. The system according to any one of claims 1 to 7, characterized in that: The upper pressing and positioning system of the oil-immersed iron core reactor is suitable for voltages of 330 kV and above.

8. A design method for the upper pressing and positioning system of an oil-immersed iron core reactor, characterized in that: The method is used for the upper pressing and positioning system of the oil-immersed iron core reactor according to any one of claims 1 to 7, and the method comprises: Obtain the effective cross-sectional area A of the core column and the magnetic induction intensity B in the core cake, and calculate the electromagnetic force F1 between the core cakes, which can be expressed as The pressure F of the butterfly spring is calculated as F1+Gg, where G is the weight of the oil-immersed iron core reactor; Determine the specification of a single butterfly spring according to the pressure F of the butterfly spring; The structural dimensions of the positioning bowl are determined according to the specifications of the single butterfly spring.

9. The method according to claim 8, characterized in that In addition to the disc spring and the positioning bowl, the constant pressure structure also includes a first positioning member, a second positioning member and a third positioning member, wherein the second positioning member includes thread structures of three specifications; The method further comprises: The thread structure of the second positioning member is changed to thread structures of two specifications, and the thread structures of the two specifications are nut structures with internal threads and external threads.

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