New dry-type air-core reactor rain cap structure and design method

Abstract

The present invention discloses a novel structure and design method for a rain cap of a dry-type hollow reactor. The design method comprises establishing a vibration differential equation of the rain cap and the reactor main coil based on the connection structure between the rain cap and the reactor main coil; calculating the displacement response of the rain cap and the reactor main coil under wind load according to the vibration differential equation; and calculating the total stiffness and total mass design parameters of the vibration suppression module in the rain cap based on the constraint condition of establishing the amplitude of the rain cap when the displacement amplitude of the reactor main coil is zero. The present invention utilizes the principle of tuned vibration absorption to design a vibration suppression module in the rain cap, which can significantly suppress or even eliminate the displacement response of the reactor main coil under wind load main resonance without significantly affecting the hot spot temperature rise of the overall structure, thereby ensuring that the reactor main coil support system can operate stably for a long time under harsh outdoor conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of dry-type air-core reactors, and in particular to a novel rainproof cap structure and a design method for dry-type air-core reactors. Background Art

[0002] Dry-type air-core reactors are critical power equipment in ultra-high voltage AC and DC transmission systems. Due to their high voltage levels, the need for external insulation necessitates a large overall height for the support insulators, resulting in a tall and flexible overall reactor design. When exposed to wind loads in outdoor environments, significant vibration amplification occurs. While the overall structure's wind resistance is verified during the design phase, there are no standards or specifications for the rigidity of the supporting structure. As a result, some reactors experience significant vibration amplitudes under wind loads. Long-term exposure can cause fatigue in the support structure, including the support insulators, affecting equipment reliability.

[0003] Furthermore, to protect the main coil of dry-type air-core reactors from rain in outdoor environments, a rain cap is typically installed on top of the coil. However, the introduction of a rain cap reduces the heat dissipation efficiency of the original structure. Therefore, it is crucial to balance heat dissipation and rain protection while suppressing the vibration amplitude of the entire structure under wind loads. Summary of the Invention

[0004] Therefore, the purpose of the present invention is to provide a novel dry-type air-core reactor rain cap structure and design method, aiming to solve the problem of wind and vibration resistance of dry-type air-core reactor in outdoor environment by adjusting the structural design of the rain cap.

[0005] In order to achieve the above object, the present invention provides a novel method for designing a rain cap for a dry-type air-core reactor, comprising the following steps:

[0006] According to the connection structure between the rain cap and the reactor, the vibration differential equation of the rain cap and the reactor main coil is established;

[0007] According to the vibration differential equation, calculate the displacement response of the rain cap and the reactor under the action of simple harmonic force;

[0008] The amplitude value of the rain cap when the amplitude of the reactor main coil is zero is used as a constraint condition;

[0009] Based on the constraints, the total stiffness and total mass design parameters required for the vibration suppression module in the rain cap are calculated.

[0010] Further preferably, the vibration differential equation of the rainproof cap and the reactor main coil is expressed by the following formula:

[0011]

[0012]

[0013] in, M 1 is the mass of the concentrated mass element of the vibration suppression module in the rain cap, K 1 is the stiffness of the elastic element of the vibration suppression module in the rain cap, Y 1 is the displacement of the rain cap under wind load, represents the second-order derivative of the displacement of the rain cap; Y 2 is the displacement of the main coil; is the second-order derivative of the main coil displacement; M 2 is the equivalent mass of the reactor main coil; K 2 is the equivalent stiffness of the reactor main coil, F is the force of wind load, is the vibration frequency, and t is the vibration time.

[0014] Further preferably, the displacement response of the rainproof cap and the reactor is expressed by the following formula:

[0015]

[0016]

[0017]

[0018] Among them, A1 is the vibration amplitude of the concentrated mass element of the rain cap vibration suppression module, and A2 is the vibration amplitude of the reactor main coil; F is the force of wind load, is the vibration frequency, M 1 is the mass of the concentrated mass element of the rain cap vibration suppression module, K 1 is the stiffness of the elastic element of the rain cap vibration suppression module, M 2 is the equivalent mass of the reactor main coil; K 2 is the equivalent stiffness of the reactor main coil.

[0019] Further preferably, the constraint condition of taking the amplitude value of the rain cap when the amplitude of the reactor main coil is zero includes:

[0020]

[0021] Among them, R2 is the outer diameter of the reactor main coil, R1 is the inner diameter of the reactor main coil, is the vibration frequency, M 1 is the mass of the concentrated mass element of the rain cap, K 1 is the stiffness of the elastic element of the rain cap.

[0022] Further preferably, according to the amplitude constraint condition of the rain cap, the total stiffness of the vibration suppression module of the rain cap is calculated using the following formula:

[0023] Total stiffness of the vibration suppression module of the rain cap ;

[0024] Among them, R2 is the outer diameter of the coil of the reactor, R1 is the inner diameter of the coil of the reactor, F is the force of wind load.

[0025] Further preferably, the total mass of the vibration suppression module of the rainproof cap is calculated using the following formula:

[0026] ;

[0027] Among them, R2 is the outer diameter of the coil of the reactor, R1 is the inner diameter of the coil of the reactor, F The main problem solved by the present invention is that the displacement response of the main coil is too large when the wind load excitation frequency is close to the reactor body frequency (main resonance). Therefore, the wind load excitation frequency It is also equivalent to the natural frequency of the reactor. f is the minimum frequency of the horizontal translation vibration mode of the reactor body support structure, in Hz; if the first-order mode vibration mode of the reactor body support structure is horizontal translation, then f corresponds to the first-order frequency; if the first-order modal vibration shape of the reactor body supporting structure is torsion along the gravity axis, then f Corresponding to the second-order frequency.

[0028] The present invention provides a novel dry-type air-core reactor rain cap structure, comprising: a heat dissipation shell and a rigid connection component, a vibration suppression component and a water collection and drainage component installed inside the heat dissipation shell;

[0029] The bottom of the rigid connection assembly is connected to the star frame arm of the reactor, and the center of the upper part of the rigid connection assembly is installed with a water collection and drainage assembly;

[0030] The vibration suppression assembly includes an elastic element and a concentrated mass element, and the elastic element and the concentrated mass element are designed according to the vibration stiffness and weight calculated according to the above-mentioned vibration dynamics equivalent model.

[0031] Further preferably, the rigid connection assembly includes column elements, beam elements and diagonal reinforcements; the column elements and diagonal reinforcements are rigidly fixedly connected to the upper star frame arms of the reactor main coil respectively; the beam elements include a main beam and a secondary beam, which are rigidly fixedly connected to the column elements respectively, wherein the main beam is arranged along the downwind direction of the reactor installation location, and the cross beam is arranged perpendicular to the main beam.

[0032] Further preferably, the elastic element is bolted to the column element in the rigid connection assembly, and the concentrated mass element is in frictionless contact with the slide rail under the main beam in the rigid connection assembly through a plurality of smooth rollers.

[0033] Further preferably, the water collection and drainage assembly includes a water collection trough with a filter screen, a fixed connecting plate and a drain pipe. The water collection trough is rigidly fixed to the main beam element in the rigid connection assembly through the fixed connecting plate, and a number of drain pipes are arranged at the bottom of the water collection trough; the bottom area of ​​the water collection trough is larger than 2 times the diameter of the center hole on the top of the rain cap, and a filter screen structure is arranged in the water collection trough. The drain pipes are arranged in a circumferential array along the water collection trough, and the total area of ​​the drain pipes is designed to be 1 / 10 of the bottom area of ​​the water collection trough.

[0034] The novel dry-type hollow reactor rain cap design method and rain cap structure disclosed in this application utilize a vibration suppression module integrated with a tuned mass damper in the rain cap. By establishing a vibration dynamics equivalent model, the key wind vibrations of the supporting structure can be greatly suppressed or even eliminated, thereby significantly improving long-term operational reliability.

[0035] This application sets up drainage components, utilizes large-capacity water collection tanks, filter screens, and multiple drainage pipe designs to effectively collect and quickly drain rainwater, preventing water accumulation and blockage.

[0036] The heat dissipation housing provided in the present application utilizes the thin-walled hollow cylinders arrayed on the grille assembly to not only form a rainproof barrier, but also increase the heat dissipation surface area, further improving the heat dissipation capacity, and providing a top center hole to provide a direct upward hot air outlet.

[0037] This application does not simply stack rain protection, vibration reduction, and heat dissipation, but through ingenious design, organically integrates them and works together to improve the comprehensive reliability of the equipment in harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the novel dry-type air-core reactor rain cap structure and vibration dynamics equivalent model provided by the present invention;

[0039] Figure 2 This is a schematic diagram of the internal structure of the rain cap of the present invention;

[0040] Figure 3 It is a structural schematic diagram of the rigid connection assembly of the present invention;

[0041] Figure 4 Schematic diagram of the structure of the vibration suppression assembly of the present invention;

[0042] Figure 5 This is a schematic diagram of the drainage assembly of the present invention;

[0043] Figure 6This is an external view of the heat dissipation housing of the present invention;

[0044] Figure 7 This is an internal view of the heat dissipation housing of the present invention.

[0045] In the picture:

[0046] 1. Star frame arm of the reactor; 2. Collection and drainage assembly; 3. Rigid connection assembly; 4. Heat dissipation housing; 5. Vibration suppression assembly; 21. Fixed connection plate; 22. Drain pipe; 23. Collection trough with filter screen; 31. Main beam; 32. Secondary beam; 33. Diagonal brace; 34. Column element; 35. Slide rail; 41. Center hole; 42. Side grille; 51. Mass element; 52. Frictionless pulley; 53. Elastic element. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] like Figure 1-7 As shown, an embodiment of the present invention provides a novel rain cap structure for dry-type air-core reactor, as shown in FIG. Figure 2 The overall structure includes: a heat dissipation shell 4 and a rigid connection component 3, a vibration suppression component 5 and a drainage component 2 installed inside the heat dissipation shell 4;

[0049] Figure 3 As shown, the bottom of the rigid connection component 3 is connected to the star frame arm 1 of the reactor, and the water collection and drainage component 2 is installed in the center of the upper part of the rigid connection component 3; the rigid connection component 3 includes a column element 34, a beam element and an inclined tie bar 33; the inclined tie bar 33 is arranged in the middle of the main element, and the column element 34 and the inclined tie bar 33 are respectively rigidly fixed to the upper star frame arm of the reactor main coil; the beam element includes a main beam 31, a secondary beam 32 and a slide rail 35, and the main beam 31 and the secondary beam 32 are respectively rigidly fixed to the column element 34, wherein the main beam 31 is arranged along the downwind direction of the reactor installation location, and the cross beam is arranged perpendicular to the main beam 31; the slide rail 35 is arranged below the main beam 31.

[0050] Figure 4 As shown, the vibration suppression assembly 5 includes an elastic element 53 and a concentrated mass element 51, and the elastic element 53 and the concentrated mass element 51 are arranged in a manner as follows: Figure 1 The vibration equivalent model is constructed, and the vibration stiffness and weight design are calculated. The elastic element 53 is bolted to the column element 34 in the rigid connection component 3, and the concentrated mass element 51 is in frictionless contact with the slide rail 35 under the main beam 31 in the rigid connection component 3 through several smooth rollers.

[0051] The structural design of the rain cap is mainly the design of the vibration suppression component, which mainly includes the following steps:

[0052] According to the connection structure between the rain cap and the reactor main coil, the vibration differential equation of the rain cap and the reactor main coil is established;

[0053] The vibration differential equation of the rain cap and the reactor main coil is expressed as follows:

[0054]

[0055]

[0056] in, M 1 is the mass of the concentrated mass element of the vibration suppression module in the rain cap, K 1 is the stiffness of the elastic element of the vibration suppression module in the rain cap, Y 1 is the displacement of the rain cap under wind load, represents the second-order derivative of the displacement of the rain cap; Y 2 is the displacement of the main coil; is the second-order derivative of the main coil displacement; M 2 is the equivalent mass of the reactor main coil; K 2 is the equivalent stiffness of the reactor main coil, F is the force of wind load, is the vibration frequency, and t is the vibration time.

[0057] According to the vibration differential equation, the displacement response of the rain cap and the reactor main coil under the action of the simple harmonic force is calculated;

[0058] Under the action of simple harmonic force, the response of the system is also simple harmonic vibration. and

[0059] Substituting into the above differential equation, the displacement response of the rain cap and the reactor is expressed by the following formula:

[0060]

[0061] Among them, A1 is the vibration amplitude of the concentrated mass element of the rain cap vibration suppression module, and A2 is the vibration amplitude of the reactor main coil; F is the force of wind load, is the vibration frequency, M 1 is the mass of the concentrated mass element of the rain cap vibration suppression module, K 1 is the stiffness of the elastic element of the rain cap vibration suppression module, M 2 is the equivalent mass of the reactor main coil; K 2 is the equivalent stiffness of the reactor main coil.

[0062] The amplitude value of the rain cap when the amplitude of the reactor main coil is zero is used as a constraint condition;

[0063] when When , it means that the vibration amplitude of the reactor coil body is zero, that is, the reactor support system will not shake left and right; therefore, the amplitude constraints of the rain cap include: That is, when the frequency of the vibration suppression module itself is equal to the wind load frequency, the vibration of the reactor support system can be offset.

[0064] Furthermore, considering that =0, , that is, the amplitude of the concentrated mass element in the vibration suppression module is not zero; considering that the mass element in the vibration suppression module swings inside the rain cap, and the outer diameter of the rain cap is generally slightly larger than the outer diameter of the coil of the reactor body, the maximum amplitude of the concentrated mass element in the vibration suppression module is A2=(R2-R1) m, where R2 is the outer diameter of the coil of the reactor and R1 is the inner diameter of the coil of the reactor; therefore, the amplitude constraint condition of the rain cap is finally:

[0065]

[0066] Among them, R2 is the outer diameter of the reactor main coil, R1 is the inner diameter of the reactor main coil, is the vibration frequency, M 1 is the mass of the concentrated mass element of the rain cap, K 1 is the stiffness of the elastic element of the rain cap.

[0067] According to the amplitude constraint condition of the rain cap, the total stiffness and total mass of the vibration suppression module of the rain cap are calculated.

[0068] Designing based on the maximum amplitude, the total stiffness of the vibration suppression module can be obtained as:

[0069]

[0070] Then, the design mass of the concentrated mass element of the vibration suppression module is:

[0071] ;

[0072] in, F is the force of the wind load (including the sum of the forces on the reactor main coil and the rain cap); since the main problem solved by the present invention is that the displacement response of the main coil is too large when the wind load excitation frequency is close to the reactor body frequency (main resonance), the wind load excitation frequency is It is also equivalent to the natural frequency of the reactor. fis the minimum frequency of the horizontal translation vibration mode of the supporting structure of the reactor body (excluding the rain cap structure), in Hz. That is, if the first-order mode vibration mode of the supporting structure of the reactor body (excluding the rain cap structure) is horizontal translation, then f Corresponding to the first-order frequency; if the first-order modal vibration shape of the supporting structure of the reactor body (excluding the rain cap structure) is torsion along the gravity axis, then f Corresponding to the second-order frequency.

[0073] like Figure 5 The drainage assembly 2 includes a water collection trough with a filter screen, a fixed connecting plate 21, and a drain pipe 22. The water collection trough is rigidly fixed to the main beam 31 component in the rigid connection assembly 3 through the fixed connecting plate 21. A number of drain pipes 22 are arranged at the bottom of the water collection trough. To ensure timely drainage at the maximum expected water inflow rate and avoid water accumulation, the bottom area of ​​the water collection trough is greater than twice the diameter of the center hole 41 at the top of the rain cap. A filter screen structure is set in the water collection trough to prevent debris from clogging the drain pipe and affecting drainage. The drain pipes 22 are arranged in an array along the circumference of the water collection trough, and the total area of ​​the drain pipes 22 is designed to be 1 / 10 of the bottom area of ​​the water collection trough. The depth of the water collection trough is not less than 100mm.

[0074] like Figure 6 and Figure 7 The heat dissipation housing includes a top center hole 41 and side grilles 42. To prevent the rain shield from affecting the heat dissipation capacity of the structure while protecting against rain, relevant holes are provided on the sides and top center of the rain cap. The side holes are arranged along a circumference and are located at a position more than half the height of the rain cap. The purpose is to create a chimney effect with the lower half of the rain cap to help the hot air diffuse upward. To prevent the side holes of the rain cap from leaking due to oblique wind, the side holes are provided with grille assemblies. The outer diameter of the grille assembly is smaller than the outer diameter of the side edge of the top rain cap. Several thin-walled hollow cylinders are arranged on the top to enhance the heat dissipation capacity of the structure.

[0075] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A novel dry-type air-core reactor rain cap structure design method, characterized in that: The following steps are involved: According to the connection structure between the rain cap and the reactor main coil, the vibration differential equation of the rain cap and the reactor main coil is established; According to the vibration differential equation, the displacement response of the rain cap and the reactor main coil under the action of the simple harmonic force is calculated; the vibration differential equation of the rain cap and the reactor main coil is expressed by the following formula: in, M 1 is the mass of the concentrated mass element of the vibration suppression module in the rain cap, K 1 is the stiffness of the elastic element of the vibration suppression module in the rain cap, Y 1 is the displacement of the rain cap under wind load, represents the second-order derivative of the displacement of the rain cap; Y 2 is the displacement of the main coil; is the second-order derivative of the main coil displacement; M 2 is the equivalent mass of the reactor main coil; K 2 is the equivalent stiffness of the reactor main coil, F is the force of wind load, is the vibration frequency, t is the vibration time; The amplitude value of the rain cap when the amplitude of the reactor main coil is zero is used as a constraint condition; Based on the constraints, the total stiffness and total mass design parameters required for the vibration suppression module in the rain cap are calculated.

2. The novel dry-type air-core reactor rain cap structure design method according to claim 1 is characterized in that: The displacement response of the rain cap and reactor is expressed by the following formula: Among them, A1 is the vibration amplitude of the concentrated mass element of the rain cap vibration suppression module, and A2 is the vibration amplitude of the reactor main coil; F is the force of wind load, is the vibration frequency, M 1 is the mass of the concentrated mass element of the rain cap vibration suppression module, K 1 is the stiffness of the elastic element of the rain cap vibration suppression module, M 2 is the equivalent mass of the reactor main coil; K 2 is the equivalent stiffness of the reactor main coil.

3. The novel dry-type air-core reactor rain cap structure design method according to claim 2 is characterized in that: The constraint condition of taking the amplitude value of the rain cap when the amplitude of the reactor main coil is zero includes: Among them, R2 is the outer diameter of the reactor main coil, and R1 is the inner diameter of the reactor main coil.

4. The novel dry-type air-core reactor rain cap structure design method according to claim 2 is characterized in that: According to the constraints, the total stiffness of the vibration suppression module in the rain cap is calculated using the following formula: Total stiffness of the vibration suppression module of the rain cap .

5. The novel dry-type air-core reactor rain cap structure design method according to claim 2 is characterized in that: Use the following formula to calculate the total mass of the vibration suppression module in the rain cap: ； in, f is the minimum frequency of the horizontal translation vibration mode of the reactor body support structure, in Hz; if the first-order mode vibration mode of the reactor body support structure is horizontal translation, then f corresponds to the first-order frequency; if the first-order modal vibration shape of the reactor body supporting structure is torsion along the gravity axis, then f Corresponding to the second-order frequency.

6. A new type of dry-type air-core reactor rain cap structure, characterized in that: include: A heat dissipation housing and a rigid connection assembly, a vibration suppression assembly and a drainage assembly installed inside the heat dissipation housing; The bottom of the rigid connection assembly is connected to the star frame arm of the reactor, and the center of the upper part of the rigid connection assembly is installed with a water collection and drainage assembly; The vibration suppression component includes an elastic element and a concentrated mass element, and the elastic element and the concentrated mass element are designed according to the vibration stiffness and weight calculated according to the vibration dynamics equivalent model of the novel dry-type air-core reactor rain cap structure design method described in any one of claims 1 to 5 above.

7. The novel dry-type air-core reactor rain cap structure according to claim 6 is characterized in that: The rigid connection assembly includes column elements, beam elements and oblique reinforcements; the column elements and oblique reinforcements are rigidly fixedly connected to the upper star frame arms of the reactor main coil respectively; the beam elements include a main beam and a secondary beam, which are rigidly fixedly connected to the column elements respectively, wherein the main beam is arranged along the downwind direction of the reactor installation location, and the cross beam is arranged perpendicular to the main beam.

8. The novel dry-type air-core reactor rain cap structure according to claim 6 is characterized in that: The elastic element is connected with the column element in the rigid connection assembly by bolts, and the concentrated mass element is in frictionless contact with the slide rail under the main beam in the rigid connection assembly through a plurality of smooth rollers.

9. The novel dry-type air-core reactor rain cap structure according to claim 6, characterized in that: The water collection and drainage assembly includes a water collection trough with a filter screen, a fixed connecting plate and a drain pipe. The water collection trough is rigidly fixed to the main beam element in the rigid connection assembly through the fixed connecting plate, and a number of drain pipes are arranged at the bottom of the water collection trough; the bottom area of ​​the water collection trough is greater than 2 times the diameter of the center hole on the top of the rain cap, and a filter screen structure is set in the water collection trough. The drain pipes are arranged in a circumferential array along the water collection trough, and the total area of ​​the drain pipes is designed to be 1 / 10 of the bottom area of ​​the water collection trough.

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