Composite noise reduction structure for oil tank of extra-high voltage shunt reactor

Abstract

The utility model belongs to the technical field of reactors, and particularly relates to an extra-high voltage shunt reactor oil tank composite noise reduction structure which comprises a rubber plate fixedly installed in an oil tank wall, the outer side of the rubber plate is attached to the surface of the inner side wall of the oil tank wall, and a sound absorption hole-free paperboard is fixedly installed on the inner side of the rubber plate. A double-layer composite perforated plate sound absorption mechanism is fixedly installed on the inner side of the sound absorption hole-free paperboard, gaps are reserved among the rubber plate, the sound absorption hole-free paperboard and the double-layer composite perforated plate sound absorption mechanism, and a gap is reserved between two layers of perforated plates of the double-layer composite perforated plate sound absorption mechanism. The double-layer composite perforated plate sound absorption mechanism comprises a first perforated paperboard and a second perforated paperboard. The composite noise attenuation structure composed of the rubber plate and the multiple layers of insulating paper plates is arranged on the inner side wall of the oil tank, vibration waves transmitted from insulating oil are blocked and weakened through material combination of different media, vibration noise can be reduced, and the composite noise attenuation oil tank is an important measure for solving the problem of noise of an electric reactor.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electric reactor, concretely relates to a compound noise reduction structure of extra -high voltage shunt reactor oil tank. BACKGROUND

[0002] The electric reactor is easy to produce larger vibration and noise due to the special core structure and the problem of magnetic flux leakage in the operation process. With the wide application of the electric reactor, the noise problem caused by the electric reactor has caused more and more attention of people, and the noise of the electric reactor has caused pollution to the surrounding environment, and the vibration problem caused by too large noise can endanger the safe operation of the equipment itself, and greatly influence the operation of the power station.

[0003] According to the needs of new power system construction, low noise operation has become an important requirement for power equipment. The noise of the electric reactor is mainly generated by the vibration of the core and winding and is transmitted to the outside through the oil tank. The noise reduction structure is arranged on the inner side wall of the oil tank to block and weaken the vibration wave conducted from the insulating oil, can reduce the vibration noise, and is an important measure to solve the noise problem of the electric reactor. Therefore, it is necessary to design a new noise reduction structure for the inner side wall of the oil tank of the electric reactor. SUMMARY

[0004] The utility model discloses a compound noise reduction structure for electric reactor can solve the foregoing technical problem. The design scheme for realizing the purpose of the utility model is as follows:

[0005] A compound noise reduction structure of extra -high voltage shunt reactor oil tank, including the fixed installation in the oil tank box wall inside's rubber plate, the rubber plate outside fits the inner side wall surface of oil tank box wall, rubber plate inner side fixed installation no sound absorption hole paperboard, no sound absorption hole paperboard inner side fixed installation double -deck compound perforated plate sound absorption mechanism, the clearance is reserved between rubber plate, no sound absorption hole paperboard and double -deck compound perforated plate sound absorption mechanism, and the clearance is reserved between the two layers of perforated plate of double -deck compound perforated plate sound absorption mechanism.

[0006] Preferably, the double-layer composite perforated plate sound absorption mechanism comprises a perforated paperboard I and a perforated paperboard II, a fixed nut is welded to the inner wall of the oil tank wall, a through hole I corresponding to the fixed nut is formed in the rubber plate, and the rubber plate is sleeved on the outer periphery of the fixed nut through the through hole I; a pad I is arranged on the inner side of the rubber plate, a through hole II corresponding to the fixed nut is formed in the center of the pad I, and the pad I is sleeved on the outer periphery of the fixed nut through the through hole II; a non-sound-absorbing hole paperboard is arranged on the inner side of the pad I, a through hole III corresponding to the fixed nut is formed in the non-sound-absorbing hole paperboard, and the non-sound-absorbing hole paperboard is sleeved on the outer periphery of the fixed nut through the through hole III; one end of an insulating screw rod is screwed into the fixed nut; a pad II is arranged on the inner side of the non-sound-absorbing hole paperboard, a stepped through hole is formed in the center of the pad II, the outer end of the stepped through hole corresponds to the fixed nut, the inner end of the stepped through hole corresponds to the insulating screw rod, and the fixed nut and the insulating screw rod pass through the two ends of the stepped through hole of the pad II respectively; a perforated paperboard I is arranged on the inner side of the pad II, a through hole IV corresponding to the insulating screw rod is formed in the perforated paperboard I, and the insulating screw rod is arranged to fix the perforated paperboard I through the through hole IV; a pad III is arranged on the inner side of the perforated paperboard I, a through hole V corresponding to the insulating screw rod is formed in the center of the pad III, and the pad III is sleeved on the outer periphery of the insulating screw rod through the through hole V; a perforated paperboard II is arranged on the inner side of the pad III, a through hole VI corresponding to the insulating screw rod is formed in the perforated paperboard II, and the insulating screw rod is arranged to fix the perforated paperboard II through the through hole VI; a pad IV is arranged on the inner side of the perforated paperboard II, a through hole VII corresponding to the insulating screw rod is formed in the center of the pad IV, and the pad IV is sleeved on the outer periphery of the insulating screw rod through the through hole VII; an insulating nut II and an insulating nut I are threadedly arranged on the other end of the insulating screw rod.

[0007] Preferably, the fixed nut is made of stainless steel, the insulating screw rod is made of a glass fiber screw rod, the insulating nut II and the insulating nut I are made of glass fiber nuts, the rubber plate is made of a shock-absorbing and noise-reducing special rubber pad, and the non-sound-absorbing hole paperboard, the perforated paperboard I and the perforated paperboard II are all made of insulating paperboards.

[0008] Preferably, the perforated paperboard I is provided with sound-absorbing holes I with a diameter of 10 mm, the center distance between adjacent sound-absorbing holes I is 100 mm, the perforated paperboard II is provided with sound-absorbing holes II with a diameter of 10 mm, and the center distance between adjacent sound-absorbing holes II is 50 mm.

[0009] Preferably, the rubber plate, the non-sound-absorbing hole paperboard, the perforated paperboard I and the perforated paperboard II are all made of whole plates which are bent to form U-shaped structures.

[0010] The utility model discloses beneficial effects of:

[0011] The composite noise attenuation structure composed of the rubber plate and the multiple insulating paperboards is arranged on the inner wall of the oil tank, vibration waves conducted from the insulating oil are blocked and weakened through the combination of different medium materials, and thus the vibration noise can be reduced, and the utility model is an important measure to solve the noise problem of the electric reactor. BRIEF DESCRIPTION OF DRAWINGS

[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0013] Figure 1 This is a top view of the composite noise reduction structure of the fuel tank according to an embodiment of this utility model;

[0014] Figure 2 yes Figure 1 A magnified view of a section at point B in the middle;

[0015] Figure 3 This is a partial structural schematic diagram of a perforated cardboard according to an embodiment of the present invention;

[0016] Figure 4 This is a partial structural schematic diagram of the perforated cardboard II according to an embodiment of the present utility model;

[0017] Among them, 1. Glue board, 2. Paperboard without sound-absorbing holes, 3. Perforated paperboard one, 4. Perforated paperboard two, 5. Spacer one, 6. Spacer two, 7. Spacer three, 8. Spacer four, 9. Insulating nut one, 10. Insulating screw, 11. Fixing nut, 12. Oil tank wall, 13. Insulating nut two, 14. Sound-absorbing hole one, 15. Sound-absorbing hole two. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0019] like Figure 1 , 2 As shown, a composite noise reduction structure for an oil tank used in an ultra-high voltage parallel reactor is disclosed. The composite noise reduction structure consists of two parts, symmetrically fixedly installed on the inner walls of the oil tank wall 12 on both sides of the iron core yoke. The oil tank wall 12 is not installed on the cooling side and the outgoing line side. The composite noise reduction structure is a composite structure composed of a rubber sheet 1 and multiple layers of cardboard, with gaps between each adjacent pair of sheets. Specifically, it includes: rubber sheet 1, cardboard without sound-absorbing holes 2, perforated cardboard one 3, and perforated cardboard two 4. The rubber sheet 1, cardboard without sound-absorbing holes 2, perforated cardboard one 3, and perforated cardboard two 4 are fixedly installed using fixing nuts 11, insulating screws 10, insulating nuts one 9, and insulating nuts two 13. The fixing nuts 11 are welded to the inner wall surface of the oil tank wall 12. The position and number of fixing nuts 11 are preferably sufficient to reliably fix the composite noise reduction structure, and the fixing nuts 11 are preferably made of stainless steel. One end of the insulating screw 10 is screwed into the fixing nut 11. The insulating screw 10 is an M20 high-strength glass fiber screw.

[0020] The material of the rubber plate 1 is a 10mm-thick rubber pad specially used for shock absorption and noise reduction. A through hole one corresponding to the fixing nut 11 is formed on the rubber plate 1. The rubber plate 1 is sleeved on the outer periphery of the fixing nut 11 through the through hole one, and the outer side surface of the rubber plate 1 is tightly arranged against the inner side wall surface of the oil tank wall 12.

[0021] A cushion block one 5 is fixedly installed on the inner side surface of the rubber plate 1. A through hole two corresponding to the fixing nut 11 is formed at the center position of the cushion block one 5. The cushion block one 5 is sleeved on the outer periphery of the fixing nut 11 through the through hole two. The thickness of the cushion block one 5 is 10mm, so that a 10mm gap is left between the rubber plate 1 and the sound-absorption holeless paperboard 2, preventing the rubber plate 1 from directly contacting the sound-absorption holeless paperboard 2, so as to reduce noise.

[0022] The sound-absorption holeless paperboard 2 is fixedly installed on the inner side surface of the cushion block one 5. The sound-absorption holeless paperboard 2 is a 3mm-thick insulating paperboard. A through hole three corresponding to the fixing nut 11 is formed on the sound-absorption holeless paperboard 2. The sound-absorption holeless paperboard 2 is sleeved on the outer periphery of the fixing nut 11 through the through hole three.

[0023] A cushion block two 6 is fixedly installed on the inner side surface of the sound-absorption holeless paperboard 2. The thickness of the cushion block two 6 is 25mm. A stepped through hole is formed at the center position of the cushion block two 6. The outer end of the stepped through hole corresponds to the fixing nut 11, and the inner end of the stepped through hole corresponds to the insulating screw rod 10. The fixing nut 11 and the insulating screw rod 10 respectively pass through the two ends of the stepped through hole of the cushion block two 6. The insulating screw rod 10 and the fixing nut 11 cooperate to prevent the cushion block two 6 from falling off.

[0024] A perforated paperboard one 3 is fixedly installed on the inner side surface of the cushion block two 6. The perforated paperboard one 3 is a 2mm-thick insulating paperboard. A through hole four corresponding to the insulating screw rod 10 is formed on the perforated paperboard one 3. The insulating screw rod 10 passes through the through hole four to fix the perforated paperboard one 3. In addition, the perforated paperboard one 3 regularly drills sound-absorption holes one 14 with a specification of φ10mm at the remaining positions. The hole center distance between adjacent sound-absorption holes one 14 is 100mm, as shown in Figure 3

[0025] A cushion block three 7 is fixedly installed on the inner side surface of the perforated paperboard one 3. The thickness of the cushion block three 7 is 25mm. A through hole five corresponding to the insulating screw rod 10 is formed at the center position of the cushion block three 7. The cushion block three 7 is sleeved on the outer periphery of the insulating screw rod 10 through the through hole five.

[0026] A perforated paperboard two 4 is fixedly installed on the inner side surface of the cushion block three 7. The perforated paperboard two 4 is a 2mm-thick insulating paperboard. A through hole six corresponding to the insulating screw rod 10 is formed on the perforated paperboard two 4. The insulating screw rod 10 passes through the through hole six to fix the perforated paperboard two 4. In addition, the perforated paperboard two 4 regularly drills sound-absorption holes two 15 with a specification of φ10mm at the remaining positions. The hole center distance between adjacent sound-absorption holes two 15 is 50mm, as shown in Figure 4 ​The perforated paperboard two 4 and the perforated paperboard one 3 constitute a double-layer composite perforated plate sound absorption mechanism.

[0027] The inner side of the perforated paperboard two 4 is fixedly installed with a cushion block four 8, the thickness of the cushion block four 8 is 8mm, a through hole seven corresponding to the insulating screw rod 10 is arranged at the center position of the cushion block four 8, and the cushion block four 8 is sleeved on the outer periphery of the insulating screw rod 10 through the through hole seven.

[0028] The insulating nut two 13 and the insulating nut one 9 are threadedly installed at the other end of the insulating screw rod 10, the insulating nut two 13 is adjacent to the perforated paperboard two 4, the insulating nut two 13 and the insulating nut one 9 are M20 high-strength glass fiber nuts, and the double-nut structure of the insulating nut two 13 and the insulating nut one 9 can effectively prevent loosening.

[0029] The shock-absorbing and noise-reducing special rubber pad, wherein a representative product is NP rubber specially developed and independently named by Shenma Company, the NP rubber is used for distinguishing from other rubber types, the rubber type of the NP rubber is NP70, the NP rubber has good compression and rebound characteristics, can reduce the vibration transmission of the internal structure of the oil tank, has a high loss factor, can convert mechanical energy into heat energy, and can be used as a damping material.

[0030] The insulating paperboard is designed as single-layer non-absorbing hole paperboard 2 plus double-layer composite perforated plate sound absorbing mechanism, a large number of small holes are drilled on perforated paperboard one 3 and perforated paperboard two 4 according to certain arrangement rules, and a certain thickness gap is left behind the plates, when sound waves are incident, the transformer oil in the gap will reciprocate, due to the frictional damping with the small hole wall, part of the sound energy is converted into heat energy and is lost, so that the noise reduction purpose is achieved. The double-layer composite perforated plate sound absorbing mechanism with different perforation rates can improve the sound absorption coefficient, effectively widen the sound absorption frequency band, and improve the noise reduction performance of the perforated plate resonance sound absorbing structure. According to relevant research, the main vibration frequency of the 50Hz reactor is 100Hz. When the perforation rate of the double-layer composite perforated plate sound absorbing mechanism is in the range of 1%-10%, the plate thickness is 2-13mm, and the gap thickness is 6-100mm, the resonance frequency is 100-400Hz, which is consistent with the main vibration frequency of the reactor, and can be used for resonance sound absorption of the reactor noise. The utility model adopts single-layer non-absorbing hole paperboard 2 plus double-layer composite perforated plate sound absorbing mechanism, and the three-layer paperboards are: one layer of 3mm-thick non-absorbing hole paperboard 2, one layer of 2mm-thick perforated paperboard one 3 (the perforation rate is about 1%), and one layer of 2mm-thick perforated paperboard two 4 (the perforation rate is about 3%, the hole diameter of the perforated paperboard two 4 is 10mm (the radius is 5mm), the hole center distance is 50mm, and the perforation rate is π*5*5 / (50*50)=3.14%, about 3%), and the paperboard gap is 25mm.

[0031] The oil tank composite noise reduction structure is arranged in the inner sides of two side yokes, and extends to the inner sides of the tank walls of the high-voltage side and the cooling side by bending. The tank wall is closest to the core, and is a main channel for transmitting the reactor noise outward, so that the oil tank composite noise reduction structure can achieve obvious noise reduction effect. Further, the rubber plate 1, the non-absorbing hole paperboard 2, the perforated paperboard one 3 and the perforated paperboard two 4 are all subjected to bending treatment by using the whole plate, and the horizontal section of the rubber plate 1, the non-absorbing hole paperboard 2, the perforated paperboard one 3 and the perforated paperboard two 4 after the bending treatment is U-shaped. The integral U-shaped structure not only ensures the noise reduction effect, but also is convenient to assemble.

[0032] In the embodiments of the utility model, the technical features not described in detail are all prior art or conventional technical means, which will not be described here.

[0033] Finally, it needs to be explained that: the above examples, only for the specific embodiments of the present application, to illustrate the technical scheme of the present application, and not to limit it, the protection scope of the present application is not limited to this. Those skilled in the art should understand: any familiar with the technical field of the technical personnel in the technical range disclosed by the present application, it can be modified or easily thought of changes to the technical solutions recorded in the foregoing examples, or part of the technical features of the equivalent replacement; and these modifications, changes or replacement, without the essence of the corresponding technical scheme deviate from the spirit and scope of the present application embodiment technical scheme, all should be covered in the protection scope of the present application.

Claims

1. A composite noise reduction structure for an extra-high voltage shunt reactor oil tank, comprising a rubber plate (1) fixedly installed inside a tank wall (12) of the oil tank, characterized in that, The inner side wall surface of the oil tank wall (12) is attached to the outer side of the rubber plate (1), the rubber plate (1) is fixedly installed with the non-absorbing hole paperboard (2) on the inner side, and the double-layer composite perforated plate sound absorbing mechanism is fixedly installed on the inner side of the non-absorbing hole paperboard (2).

2. The composite noise reduction structure of an UHV shunt reactor oil tank according to claim 1, characterized in that, The double-layer composite perforated plate sound absorbing mechanism comprises a perforated paperboard one (3) and a perforated paperboard two (4), the fixed nut (11) is welded on the inner side wall of the oil tank wall (12), and the through hole one corresponding to the fixed nut (11) is formed on the rubber plate (1); the inner side of the rubber plate (1) is installed with the cushion block one (5), the through hole two corresponding to the fixed nut (11) is formed on the center position of the cushion block one (5); the inner side of the cushion block one (5) is installed with the non-absorbing hole paperboard (2), and the through hole three corresponding to the fixed nut (11) is formed on the non-absorbing hole paperboard (2); one end of the insulating screw rod (10) is screwed into the fixed nut (11); the inner side of the non-absorbing hole paperboard (2) is installed with the cushion block two (6), the stepped through hole is formed on the center position of the cushion block two (6), the outer end of the stepped through hole corresponds to the fixed nut (11), and the inner end of the stepped through hole corresponds to the insulating screw rod (10); the inner side of the cushion block two (6) is installed with the perforated paperboard one (3), and the through hole four corresponding to the insulating screw rod (10) is formed on the perforated paperboard one (3); the inner side of the perforated paperboard one (3) is installed with the cushion block three (7), and the through hole five corresponding to the insulating screw rod (10) is formed on the center position of the cushion block three (7); the inner side of the cushion block three (7) is installed with the perforated paperboard two (4), and the through hole six corresponding to the insulating screw rod (10) is formed on the perforated paperboard two (4); the inner side of the perforated paperboard two (4) is installed with the cushion block four (8), and the through hole seven corresponding to the insulating screw rod (10) is formed on the center position of the cushion block four (8); the other end of the insulating screw rod (10) is threadedly installed with the insulating nut two (13) and the insulating nut one (9).

3. The composite noise reduction structure of an UHV shunt reactor oil tank according to claim 2, characterized in that, The fixed nut (11) is made of stainless steel, the insulating screw rod (10) is made of a glass fiber screw rod, the insulating nut two (13) and the insulating nut one (9) are made of glass fiber nuts, the rubber plate (1) is made of a shock-absorbing and noise-reducing special rubber pad, and the non-absorbing hole paperboard (2), the perforated paperboard one (3) and the perforated paperboard two (4) are all made of insulating paperboards.

4. The composite noise reduction structure of an UHV shunt reactor oil tank according to claim 3, characterized in that, The perforated paperboard one (3) is provided with the sound absorbing hole one (14) with a diameter of 10 mm, the hole center spacing between adjacent sound absorbing hole ones (14) is 100 mm, the perforated paperboard two (4) is provided with the sound absorbing hole two (15) with a diameter of 10 mm, and the hole center spacing between adjacent sound absorbing hole twos (15) is 50 mm.

5. The composite noise reduction structure of an UHV shunt reactor oil tank according to any one of claims 2-4, characterized in that, The rubber plate (1), the non-absorbing hole paperboard (2), the perforated paperboard one (3) and the perforated paperboard two (4) are all processed into U-shaped structures through whole plate bending.

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