CN115483010B - Transformer noise elimination and reduction system and noise reduction method - Google Patents

Abstract

The present invention provides a transformer silencing and noise reduction system and a noise reduction method, which relates to the technical field of transformer noise reduction, including a sound insulation barrier, a noise reduction unit, a sound wave emission unit, a first sensor, a second sensor and a noise reduction controller; the sound insulation barrier is arranged around the outer periphery of the transformer; the noise reduction unit is embedded in the sound insulation barrier; the sound wave emission unit is arranged at the upper edge of the sound insulation barrier; the first sensor is arranged in the sound insulation barrier; the second sensor is arranged outside the upper edge of the sound insulation barrier and is located in the emission area of the sound wave emission unit. In the transformer silencing and noise reduction system provided by the present invention, the sound insulation barrier is arranged around the outer periphery of the transformer noise, realizing passive noise reduction, the noise reduction unit converts the low-frequency noise emitted by the transformer into high-frequency noise and then performs noise reduction suppression, the sound wave emission unit can emit reverse sound waves, realize effective superposition with diffracted sound waves, realize active noise reduction, and improve the overall noise reduction effect of the silencing and noise reduction system.

Description

Transformer noise reduction system and noise reduction method

Technical Field

The present invention belongs to the technical field of transformer noise reduction, and more specifically, relates to a transformer noise reduction system and a noise reduction method.

Background technique

At present, with the increase of electricity consumption by residents, the voltage level of substations in residential areas has also increased accordingly. While large-capacity transformers meet the power supply needs, the noise they generate is also getting louder and louder. Especially for outdoor transformers, the noise has a greater impact on the surrounding environment. Transformer noise mainly includes body noise and fan noise. Fan noise is generally broadband noise, and body noise is mainly low-frequency noise caused by magnetostriction of silicon steel sheets. Low-frequency noise has a long transmission distance and slow attenuation. Long-term exposure to low-frequency noise will endanger human health and seriously affect the normal life of surrounding residents.

The existing noise reduction method generally uses a barrier made of noise reduction material to reduce noise around the transformer. The noise reduction material is made into a barrier surrounding the outside of the transformer. The overall structure is not only costly, but also affects the ventilation and heat dissipation of the transformer. Even if the distance between the sound barrier and the transformer is increased and the transformer is located in the center of the sound barrier to alleviate the heat dissipation problem, the height of the sound barrier is relatively limited due to economic and environmental factors. There is a phenomenon of noise diffraction, which causes the area around the sound barrier to be greatly affected by noise and the noise reduction effect is poor. Especially for the low-frequency noise of the transformer, the diffraction effect is more obvious, which greatly affects the noise reduction effect of the sound barrier and has a great impact on the environment.

Summary of the invention

The object of the present invention is to provide a transformer silencing and noise reduction system and a noise reduction method, which can effectively suppress the high-frequency noise and low-frequency noise of the transformer and achieve a good noise reduction effect.

To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a transformer silencing and noise reduction system, including a sound insulation barrier, a silencing unit, a sound wave transmitting unit, a first sensor, a second sensor and a silencing controller; the sound insulation barrier is arranged around the outer periphery of the transformer, and the upper edge of the sound insulation barrier is tilted and bent inward to form a shielding portion; the silencing unit is embedded in the sound insulation barrier to eliminate the low-frequency noise of the transformer; the sound wave transmitting unit is arranged at the upper edge of the sound insulation barrier to emit reverse sound waves to offset the low-frequency noise above the shielding portion; the first sensor is arranged in the sound insulation barrier to collect the initial noise signal of the transformer and transmit the initial noise signal to the silencing controller; the second sensor is arranged outside the upper edge of the sound insulation barrier and located in the transmitting area of the sound wave transmitting unit to collect the silencing noise parameters after silencing and transmit the silencing noise parameters to the silencing controller.

In a possible implementation, the sound wave transmitting unit includes:

A mounting seat connected to the outer side wall of the shielding portion;

The rotating frame is hinged to the upper part of the mounting seat through a hinge shaft, and a driving member for driving the rotating frame to swing vertically around the hinge shaft is provided between the rotating frame and the mounting seat;

The sound wave transmitter is connected to the upper part of the rotating frame, and the transmitting port is arranged toward the upper part of the central axis of the shielding part;

The driving member is electrically connected to the muffler controller to receive a driving control signal from the muffler controller and drive the rotating frame and the sound wave transmitter to swing vertically to change the sound wave emission direction of the sound wave transmitter.

In a possible implementation, the sound-absorbing unit includes:

An embedded ring is embedded in the middle of the sound insulation barrier, with two sides respectively flush with the two side walls of the sound insulation barrier, and a circumferentially penetrating accommodation cavity is provided inside the embedded ring;

An air supply pipe extends from the outer side of the embedded ring to the accommodating cavity;

The expansion ball is arranged in the accommodating cavity and one end of the expansion ball is connected to the outlet of the air supply pipe;

A vortex fan is connected to the other end of the expansion ball and is used to rotate under the action of the airflow of the expansion ball;

Wherein, under the air supply effect of the air supply pipe, the expansion ball expands and supplies air to the vortex fan to make the vortex fan rotate, and guide air from the transformer to the sound insulation barrier.

In a possible implementation, a baffle is further provided between the expansion ball and the vortex fan, and a vent hole for connecting the expansion ball and the vortex fan is provided on the baffle, and the diameter of the vent hole is smaller than the outer diameter of the vortex fan;

The inner diameter of the vent hole gradually decreases from the side close to the vortex fan to the side close to the expansion ball.

In a possible implementation, a filter screen shielding the side of the vortex fan is further provided on the inner side wall of the embedded ring, and a one-way valve for guiding the air flow into the expansion ball is provided on the air supply pipe.

In one possible implementation, the sound insulation barrier includes:

The middle copper interlayer is enclosed in a closed ring shape, and the upper part of the middle copper interlayer is bent and extended toward its axis;

Two layers of sound-absorbing cotton are set on both sides of the middle copper interlayer;

Two layers of sound-absorbing felt are arranged on the outside of the two layers of sound-absorbing cotton respectively, and the thickness of the sound-absorbing cotton is greater than the thickness of the sound-absorbing felt;

The two outer covering layers are respectively covered on the outer sides of the two layers of sound-absorbing felt, and the upper edges of the two outer covering layers extend toward each other until they are connected.

In a possible implementation, the middle copper interlayer includes a plurality of groups of bending structures connected in sequence along the circumferential direction thereof, the bending structures include a first plate body and a second plate body arranged perpendicular to each other, the adjacent side edges of the first plate body and the second plate body are connected, and the first plate body and the second plate body are arranged at intervals along the circumferential direction;

Among them, copper tubes are respectively provided on two adjacent groups of bending structures. The two copper tubes are located on the first plate body and the second plate body that are adjacent to each other, or on the first plate body and the second plate body that are far away from each other. The main axis of the copper tube is arranged perpendicular to the first plate body or the second plate body connected thereto, and the outer end surface of the copper tube is in contact with the inner side wall of the sound-absorbing cotton.

In one possible implementation, a plurality of silencer plates are provided in the copper tube, and the plate surfaces are arranged perpendicular to the main axis of the copper tube. The silencer plates are evenly spaced in the axial direction of the copper tube. The outer end of the copper tube is also sealed with a honeycomb silencer plate, and a plurality of polygonal holes are penetrated on the plate surface of the honeycomb silencer plate.

In a possible implementation, the sound attenuation unit extends into a closed ring along the circumference of the sound insulation barrier; a plurality of sound wave emitting units are arranged at intervals along the circumference of the sound insulation barrier; the first sensor and the second sensor correspond to each other inside and outside in the circumference of the sound insulation barrier and are respectively arranged close to the same sound wave emitting unit.

The present invention also provides a transformer noise reduction method using the transformer noise reduction system, comprising the following steps:

S100: The first sensor collects the initial noise signal of the transformer and transmits the initial noise signal to the muffler controller; the second sensor collects the terminal noise signal of the transformer and transmits the terminal noise signal to the muffler controller;

S200: The muffler controller calculates the actual noise difference between the initial noise signal and the terminal noise signal according to a first preset program;

S300: If the actual noise difference is less than the preset noise difference, the muffler controller sends a driving instruction to the driving member, so that the driving member drives the sound wave emitting unit to swing vertically at a preset angle and then stop;

S400: Repeat steps S100 to S300 until the actual noise difference is equal to or less than the preset noise difference.

The scheme shown in the embodiment of the present application is compared with the prior art. In the transformer silencing and noise reduction system provided by the embodiment of the present application, the sound insulation barrier is arranged around the periphery of the transformer noise, which can hinder the linear propagation of the transformer noise. The sound insulation barrier is made of sound-absorbing material, which can convert sound energy into heat energy to achieve passive noise reduction. The shielding part effectively increases the shielding area and improves the noise reduction effect. The silencing unit first converts the low-frequency noise emitted by the transformer into high-frequency noise and then absorbs and suppresses it, thereby enhancing the silencing and noise reduction effect. For the noise emitted above the shielding part, the sound wave emitting unit can be used to emit reverse sound waves to achieve effective superposition with the diffracted sound waves, thereby achieving active noise reduction, greatly reducing the low-frequency noise of the transformer, and improving the overall noise reduction effect of the silencing and noise reduction system.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

FIG1 is a schematic diagram of a flow chart of a transformer noise reduction method provided by an embodiment of the present invention;

FIG2 is a schematic diagram of a circuit structure of a transformer noise reduction method provided by an embodiment of the present invention;

FIG3 is a schematic diagram of a front cross-sectional structure of a transformer noise reduction system provided by an embodiment of the present invention;

FIG4 is a partial enlarged structural schematic diagram of I in FIG3 according to an embodiment of the present invention;

FIG5 is a partial enlarged structural schematic diagram of II in FIG3 according to an embodiment of the present invention;

FIG6 is a partial top view of the structure of the transformer noise reduction system provided by an embodiment of the present invention;

FIG7 is a schematic diagram of a partial top view of the cross-sectional structure of the sound barrier in FIG1 according to an embodiment of the present invention;

FIG8 is a schematic cross-sectional view of the copper tube in FIG7 according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of the structure of the copper tube in FIG. 8 according to the embodiment of the present invention from the right side.

Among them, the reference numerals in the figure are:

1. Noise barrier;

11. Middle copper interlayer;

111. a first plate; 112. a second plate;

12. Sound-absorbing cotton; 13. Sound-absorbing felt; 14. Outer covering layer; 15. Shielding part; 16. Silencing board; 17. Copper tube;

18. Honeycomb sound-absorbing plate; 181. Polygonal hole;

2. Noise elimination unit;

21. mounting ring; 211. accommodating cavity;

22. Air supply pipe; 221. One-way valve;

23. expansion ball; 24. vortex fan; 25. baffle; 251. vent hole; 26. filter screen;

3. Sound wave transmitting unit;

31. Mounting seat; 32. Rotating frame; 33. Sound wave transmitter; 34. Driving member;

41. a first sensor; 42. a second sensor;

5. Noise controller;

6. Transformer.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

Please refer to Figures 1 to 9 together, and now the transformer silencing and noise reduction system and noise reduction method provided by the present invention are described. The transformer silencing and noise reduction system includes a sound insulation barrier 1, a silencing unit 2, a sound wave transmitting unit 3, a first sensor 41, a second sensor 42 and a silencing controller 5; the sound insulation barrier 1 is arranged around the outer periphery of the transformer 6, and the upper edge of the sound insulation barrier 1 is tilted and bent inward to form a shielding portion 15; the silencing unit 2 is embedded in the sound insulation barrier 1 to eliminate the low-frequency noise of the transformer 6; the sound wave transmitting unit 3 is arranged at the upper edge of the sound insulation barrier 1 to emit reverse sound waves to offset the low-frequency noise above the shielding portion 15; the first sensor 41 is arranged in the sound insulation barrier 1 to collect the initial noise signal of the transformer 6 and transmit the initial noise signal to the silencing controller 5; the second sensor 42 is arranged outside the upper edge of the sound insulation barrier 1 and located in the emitting area of the sound wave transmitting unit 3 to collect the silencing noise parameters after silencing and transmit the silencing noise parameters to the silencing controller 5.

Compared with the prior art, the transformer sound insulation and noise reduction system provided in the present embodiment has a sound insulation barrier 1 arranged around the noise of the transformer 6, which can hinder the linear propagation of the noise of the transformer 6. The sound insulation barrier 1 is made of sound-absorbing material and can convert sound energy into heat energy to achieve passive noise reduction. The shielding portion 15 effectively increases the shielding area and improves the noise reduction effect. The sound insulation unit 2 first converts the low-frequency noise emitted by the transformer 6 into high-frequency noise and then absorbs and suppresses it, thereby enhancing the sound insulation and noise reduction effect. For the noise emitted above the shielding portion 15, the sound wave emitting unit 3 can be used to emit reverse sound waves to achieve effective superposition with the diffracted sound waves (mainly low-frequency noise), thereby achieving active noise reduction, greatly reducing the low-frequency noise of the transformer 6, and improving the overall noise reduction effect of the sound insulation and noise reduction system.

The sound wave emitting unit 3 adopts an active noise reduction method. Active noise reduction uses the interference of sound waves to make the diffraction noise above the sound barrier 1 and the reverse sound waves emitted by the sound wave emitting unit 3 superimpose and cancel each other, so as to achieve the purpose of controlling or eliminating noise.

The sound wave emitting surface of the sound wave emitting unit 3 should be relatively positive with the direction in which the transformer 6 radiates the largest amount of noise. In addition, the starting angle of the reverse sound wave emitted by the sound wave emitting unit 3 is equal to the starting angle of the diffracted sound wave and has an opposite phase. After the reverse sound wave and the diffracted sound wave are superimposed, the diffracted sound wave can be reduced or eliminated, thereby ensuring a good noise reduction effect.

In this embodiment, the first sensor 41 is used to collect the initial noise signal in the noise barrier, and the second sensor 42 is used to collect the terminal noise signal of the noise elimination area radiated by the sound wave emitting unit 3, and the above information is sent to the silencer controller 5. The silencer controller 5 processes the above signal to obtain the noise reduction signal required to be set by the sound wave emitting unit 3, so that the sound wave emitting unit 3 emits a corresponding noise reduction signal so as to be superimposed with the diffraction noise to achieve active noise reduction, which has good noise reduction capability and improves the noise environment around the transformer 6.

In some possible implementations, the characteristic sound wave emitting unit 3 adopts the structure shown in Figures 3 and 4. Referring to Figures 3 and 4, the sound wave emitting unit 3 includes a mounting seat 31, a rotating frame 32 and a sound wave emitter 33. The mounting seat 31 is connected to the outer wall of the shielding portion 15; the rotating frame 32 is hinged to the top of the mounting seat 31 through a hinge axis, and a driving member 34 is provided between the rotating frame 32 and the mounting seat 31 for driving the rotating frame 32 to swing vertically around the hinge axis; the sound wave emitter 33 is connected to the top of the rotating frame 32, and the emission port is arranged toward the upper part of the central axis of the shielding portion 15;

The driving member 34 is electrically connected to the muffler controller 5 to receive a driving control signal from the muffler controller 5 and drive the rotating frame 32 and the sound wave transmitter 33 to swing vertically to change the sound wave emission direction of the sound wave transmitter 33 .

In this embodiment, the sound wave emitter 33 is used to generate a sound with a phase opposite to that of the noise, so as to achieve superposition with the diffracted sound waves above the shielding portion 15, achieve the effect of offsetting and reducing, and achieve effective noise reduction of the original noise. The sound wave emitter 33 is used for transmitting active noise.

The sound wave transmitter is installed on the outer wall of the shielding portion 15 through a mounting seat 31 and a rotating frame 32. The mounting seat 31 provides a stable mounting base for the rotating frame 32. The top surface of the mounting seat 31 is arranged in the horizontal direction, and the rotating frame 32 can be vertically swung around the hinge axis to adjust the emission angle of the sound wave transmitter 33 so that the emission angle of the sound wave transmitter 33 faces the maximum noise direction of the transformer 6, thereby enhancing the superposition effect between the reverse noise and the diffraction noise, achieving effective offset of the two, and improving the noise reduction effect.

In some possible implementations, the above-mentioned characteristic silencer unit 2 adopts the structure shown in Figures 3 and 5. Referring to Figures 3 and 5, the silencer unit 2 includes an embedded ring 21, an air supply pipe 22, an expansion ball 23, and a vortex fan 24. The embedded ring 21 is embedded in the middle of the sound barrier 1, and the two sides are respectively flush with the two side walls of the sound barrier 1. The interior of the embedded ring 21 is provided with a circumferentially penetrating accommodation cavity 211; the air supply pipe 22 extends from the outer side of the embedded ring 21 to the accommodation cavity 211; the expansion ball 23 is arranged in the accommodation cavity 211, and one end is connected to the outlet of the air supply pipe 22; the vortex fan 24 is connected to the other end of the expansion ball 23, and is used to rotate under the action of the airflow of the expansion ball 23;

Here, under the air supply effect of the air supply pipe 22, the expansion ball 23 expands and supplies air to the vortex fan 24 to rotate the vortex fan 24 and guide air from the transformer 6 to the sound insulation barrier 1.

In this embodiment, the noise reduction unit 2 is arranged in the circumferential direction of the sound insulation barrier 1, which can absorb the high-frequency noise emitted by the inner transformer 6 and achieve a good noise reduction effect. The embedded ring 21 is installed on the sound insulation barrier 1, which has a good noise reduction effect, especially for the internal low-frequency noise, which can play an effective noise reduction effect.

Specifically, the gas is supplied to the embedded ring 21 through the gas supply pipe 22, thereby expanding the expansion ball 23. When the expansion ball 23 expands to a certain extent, the gas will be squeezed to flow to the side of the vortex fan 24 under the action of its own tension, and the vortex fan 24 rotates under the action of the high-pressure airflow. This will cause the airflow inside the sound barrier 1 to be greatly disturbed, causing the noise to shift in frequency and move to the inner wall side of the sound barrier 1, so that the frequency of the low-frequency noise is significantly increased, so that it is converted into high-frequency noise and absorbed by the sound barrier 1, thereby enhancing the absorption efficiency of the low-frequency noise.

In some possible implementations, the above-mentioned characteristic muffler unit 2 adopts the structure shown in Figures 3 and 5. Referring to Figures 3 and 5, a baffle plate 25 is further provided between the expansion ball 23 and the vortex fan 24, and a vent hole 251 for connecting the expansion ball 23 and the vortex fan 24 is provided on the baffle plate 25, and the diameter of the vent hole 251 is smaller than the outer diameter of the vortex fan 24;

The inner diameter of the vent hole 251 gradually decreases from the side close to the vortex fan 24 to the side close to the expansion ball 23 .

In this embodiment, in order to enhance the impact of the airflow, a baffle plate 25 is further provided between the expansion ball 23 and the vortex fan 24. The vent holes 251 on the baffle plate have a guiding effect on the airflow, and are used to guide the airflow in the expansion ball 23 to be qualitatively transported to the position of the vortex fan 24, thereby driving the vortex fan 24, increasing the rotation speed of the vortex fan 24, and causing the low-frequency noise to move to one side of the sound insulation barrier 1 under the action of the high-speed airflow, thereby increasing the frequency of the low-frequency noise, so that it can be effectively absorbed by the sound insulation barrier 1, thereby ensuring the effect of sound insulation and noise reduction.

On this basis, the inner diameter of the vent hole 251 on the side close to the vortex fan 24 gradually increases, thereby improving the smoothness of the air flow and ensuring the effective driving of the vortex fan 24.

In some possible implementations, referring to FIG. 3 and FIG. 5 , a filter screen 26 shielding the side of the vortex fan 24 is further provided on the inner wall of the embedded ring 21 , and a one-way valve 221 for guiding the air flow into the expansion ball 23 is provided on the air supply pipe 22 .

In this embodiment, the filter screen 26 disposed at the inner side of the embedded ring 21 can effectively filter impurities in gasoline to avoid adverse effects on the internal structures of the vortex fan 24, the expansion ball 23 and related components. The one-way valve 221 effectively limits the direction of the airflow, so that the airflow blows toward the position of the vortex fan 24 in a fixed direction, ensuring the effective driving of the vortex fan 24, thereby achieving the frequency shift effect of the vortex fan 24 on the inner low-frequency noise. The frequency shift effect here is mainly the process of transforming low-frequency noise into high-frequency noise.

In some possible implementations, the above-mentioned characteristic sound insulation barrier 1 adopts the structure shown in Figures 7 to 9. Referring to Figures 7 to 9, the sound insulation barrier 1 includes an intermediate copper interlayer 11, two layers of sound-absorbing cotton 12, two layers of sound-absorbing felt 13 and two outer covering layers 14. The intermediate copper interlayer 11 is enclosed in a closed ring, and the upper part of the intermediate copper interlayer 11 is bent and extended toward its axis; the two layers of sound-absorbing cotton 12 are respectively arranged on both sides of the intermediate copper interlayer 11; the two layers of sound-absorbing felt 13 are respectively arranged on the outside of the two layers of sound-absorbing cotton 12, and the thickness of the sound-absorbing cotton 12 is greater than the thickness of the sound-absorbing felt 13; the two outer covering layers 14 are respectively covered on the outside of the two layers of sound-absorbing felt 13, and the upper edges of the two outer covering layers 14 extend toward each other until they are connected.

In this embodiment, the sound insulation barrier 1 is made of sound insulation material, the middle copper interlayer 11 is a copper material component, which has a certain sound absorption capacity, and the combination of the sound-absorbing cotton 12 and the sound-absorbing felt 13 forms a good sound absorption effect. Among them, the thickness of the sound-absorbing cotton 12 is greater than that of the sound-absorbing felt 13, and the upper edge of the outer layer 14 extends to the position where they are connected to each other, forming an effective coating of the inner sound-absorbing cotton 12 and the sound-absorbing felt 13 and the middle copper interlayer 11, preventing the internal components from being corroded and damaged, and extending the service life.

In some possible implementations, the above-mentioned characteristic intermediate copper interlayer 11 adopts a structure as shown in FIG7. Referring to FIG7, the intermediate copper interlayer 11 includes a plurality of groups of bending structures sequentially connected along its circumference, the bending structures include a first plate body 111 and a second plate body 112 arranged perpendicularly to each other, the adjacent side edges of the first plate body 111 and the second plate body 112 are connected, and the first plate body 111 and the second plate body 112 are spaced apart along the circumference;

Among them, copper tubes 17 are respectively provided on two adjacent groups of bending structures. The two copper tubes 17 are located on the first plate body 111 and the second plate body 112 that are adjacent to each other, or on the first plate body 111 and the second plate body 112 that are far away from each other. The main axis of the copper tube 17 is arranged perpendicular to the first plate body 111 or the second plate body 112 connected thereto, and the outer end surface of the copper tube 17 is in contact with the inner wall of the sound-absorbing cotton 12.

In this embodiment, the middle copper interlayer 11 is formed by bending a plate-like member, and a plurality of bending structures are connected in sequence. Each bending structure is formed by a first plate and a second plate, respectively, and the plate surfaces of the first plate and the second plate are arranged perpendicular to each other, and the cross-sectional shape of the entire middle copper interlayer 11 is sawtooth-shaped. On this basis, the copper tube 17 is arranged on the plate surfaces of the first plate and the second plate, respectively. In order to enhance the sound absorption and noise reduction effect of the copper tube 17, the length of the copper tube 17 should be increased as much as possible.

On this basis, in order to avoid position interference between the two copper tubes 17 connected to the first plate and the second plate, the copper tubes 17 can be arranged according to the following two situations. In the first situation, the two copper tubes 17 are arranged on the adjacent first plate 111 and the second plate 112 of two groups of different bending structures, and are located on the outer plate surface of the first plate 111 and the second plate 112, and the two copper tubes 17 extend in the direction away from each other; in the second situation, the two copper tubes 17 are arranged on the inner plate surface of the two first plates 111 with two groups of bending structures away from each other, or the two copper tubes 17 are arranged on the inner plate surface of the first plate 111 and the second plate 112 with two groups of bending structures away from each other, and the two copper tubes 17 extend to the adjacent side to avoid position interference between the two, so as to ensure the effective absorption of noise on both sides of the sound insulation barrier 1.

In some possible implementations, the above-mentioned characteristic copper tube 17 adopts the structure shown in Figures 8 and 9. Referring to Figures 8 and 9, a plurality of silencer plates 16 are arranged in the copper tube 17, and the plate surfaces are perpendicular to the main axis of the copper tube 17. The silencer plates 16 are evenly spaced and arranged in the axial direction of the copper tube 17. The outer end of the copper tube 17 is also blocked by a honeycomb silencer plate 18, and a plurality of polygonal holes 181 are penetrated on the plate surface of the honeycomb silencer plate 18.

In this embodiment, the setting of the muffler plate 16 can enhance the muffler effect of the copper tube 17. The muffler plate 16 has multiple muffler holes, which has a good muffler effect. The multi-layer muffler plate can muffle the noise layer by layer, maximizing the muffler capacity of the component. The polygonal hole 181 arranged on the honeycomb muffler plate adopts a polygonal structure different from the muffler hole on the muffler plate, which enhances the muffler effect and realizes effective absorption of noise.

In some possible implementations, referring to FIG. 1 , the sound attenuation unit 2 extends into a closed ring along the circumference of the sound barrier 1; a plurality of sound wave emitting units 3 are arranged at intervals along the circumference of the sound barrier 1; the first sensor 41 and the second sensor 42 correspond to each other inside and outside in the circumference of the sound barrier 1, and are respectively arranged close to the same sound wave emitting unit 3.

In this embodiment, the noise elimination units 2 are distributed in the circumferential direction, which can cause the low-frequency noise at different circumferential positions to undergo frequency shift, convert the low-frequency noise into high-frequency noise, and then absorb the noise. The first sensor 41 and the second sensor 42 are correspondingly arranged in the inner and outer directions, so as to accurately judge the noise elimination effect of the sound wave emitting device, so as to adjust the direction of the sound wave emitting device accordingly and improve the noise elimination and noise reduction effect.

The present invention also provides a transformer noise reduction method using the transformer noise reduction system, comprising the following steps:

S100: The first sensor 41 collects the initial noise signal of the transformer 6 and transmits the initial noise signal to the muffler controller 5; the second sensor 42 collects the terminal noise signal of the transformer 6 and transmits the terminal noise signal to the muffler controller 5;

S200: The noise reduction controller 5 calculates the actual noise difference between the initial noise signal and the terminal noise signal according to the first preset program;

S300: If the actual noise difference is less than the preset noise difference, the muffler controller 5 sends a driving instruction to the driving member 34, so that the driving member 34 drives the sound wave emitting unit 3 to vertically swing to a preset angle and then stop;

S400: Repeat steps S100 to S300 until the actual noise difference is equal to or less than the preset noise difference.

The transformer silencing and noise reduction method provided in this embodiment utilizes the sound wave emitting unit 3 to emit reverse sound waves and effectively superimpose the diffracted sound waves to achieve the effect of active noise reduction. The initial noise signal in the sound barrier 1 and the terminal noise in the silencing area of the sound wave emitting device are respectively collected by the first sensor 41 and the second sensor 42, so that the silencing controller 5 can judge the silencing effect in this state. When it does not meet the noise reduction requirements, the emission direction of the sound wave emitting unit 3 is adjusted to enhance the effect of sound wave abutment and cancellation. After that, the above method is used for further monitoring until the actual noise difference reaches the preset noise difference. After the silencing requirements are met, the driving member 34 stops driving, and the sound wave emitting unit 3 is at a fixed angle to emit reverse sound waves.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. The transformer noise elimination and reduction system is characterized by comprising a noise elimination barrier, a noise elimination unit, a sound wave emission unit, a first sensor, a second sensor and a noise elimination controller; the sound insulation barrier is arranged on the periphery of the transformer in a surrounding mode, and the upper edge of the sound insulation barrier is bent inwards in an inclined mode to form a shielding part; the silencing unit is embedded in the sound insulation barrier and is used for eliminating low-frequency noise of the transformer; the sound wave transmitting unit is arranged at the upper edge of the sound insulation barrier and is used for transmitting reverse sound waves to offset low-frequency noise above the shielding part; the first sensor is arranged in the sound insulation barrier and is used for collecting an initial noise signal of the transformer and transmitting the initial noise signal to the sound elimination controller; the second sensor is arranged outside the upper edge of the sound insulation barrier and is positioned in the transmitting area of the sound wave transmitting unit and is used for collecting the noise elimination noise parameters after noise elimination and transmitting the noise elimination noise parameters to the noise elimination controller;

The acoustic wave transmitting unit includes:

The mounting seat is connected to the outer side wall of the shielding part;

The rotating frame is hinged above the mounting seat through a hinge shaft, and a driving piece for driving the rotating frame to vertically swing around the hinge shaft is arranged between the rotating frame and the mounting seat;

The sound wave emitter is connected above the rotating frame, and the emitting opening is arranged towards the upper part of the middle shaft of the shielding part;

The driving piece is electrically connected with the silencing controller so as to receive a driving control signal of the silencing controller and drive the rotating frame and the sound wave emitter to vertically swing so as to change the sound wave emitting direction of the sound wave emitter;

The sound damping unit includes:

the embedded ring is embedded in the middle of the sound insulation barrier, two sides of the embedded ring are respectively flush with two side walls of the sound insulation barrier, and a circumferentially through accommodating cavity is formed in the embedded ring;

an air supply pipe extending from the outer side of the embedded ring into the accommodating cavity;

The expansion ball is arranged in the accommodating cavity, and one end of the expansion ball is communicated with the outlet of the air supply pipe;

the vortex fan is connected with the other end of the expansion ball and is used for rotating under the action of air flow of the expansion ball;

wherein, under the air supply effect of the air supply pipe, the expansion ball expands and supplies air to the vortex fan to rotate the vortex fan and guide air from the transformer to the sound insulation barrier;

A baffle plate is arranged between the expansion ball and the vortex fan, a vent hole used for communicating the expansion ball and the vortex fan is arranged on the baffle plate, and the diameter of the vent hole is smaller than the outer diameter of the vortex fan;

the inner diameter of the vent hole gradually becomes smaller from the side close to the vortex fan to the side close to the expansion ball.

2. The transformer noise elimination and reduction system according to claim 1, wherein a filter screen shielding the side part of the vortex fan is further arranged on the inner side wall of the embedded ring, and a one-way valve for guiding air flow into the expansion ball is arranged on the air supply pipe.

3. The transformer muffling noise reduction system of claim 1 or 2, wherein the sound barrier comprises:

the middle copper interlayer is enclosed to be in a closed ring shape, and the upper part of the middle copper interlayer is bent and extended towards the axis of the middle copper interlayer;

Two layers of sound-absorbing cotton are respectively arranged at two sides of the middle copper interlayer;

The two layers of sound-absorbing felts are respectively arranged on the outer sides of the two layers of sound-absorbing cotton, and the thickness of the sound-absorbing cotton is larger than that of the sound-absorbing felts;

the two outer wrapping layers are respectively wrapped on the outer sides of the two sound absorbing felts, and the upper edges of the two outer wrapping layers extend to be connected in opposite directions.

4. The transformer noise elimination and reduction system according to claim 3, wherein the middle copper interlayer comprises a plurality of groups of bending structures which are sequentially connected along the circumferential direction of the middle copper interlayer, the bending structures comprise a first plate body and a second plate body which are mutually perpendicular, adjacent side edges of the first plate body and the second plate body are connected, and the first plate body and the second plate body are arranged at intervals along the circumferential direction;

the copper tubes are arranged on the adjacent two groups of bending structures respectively, the two copper tubes are located on the first plate body and the second plate body which are arranged adjacently or on the first plate body and the second plate body which are arranged far away from each other, a main shaft of each copper tube is perpendicular to the first plate body or the second plate body which are connected with the main shaft of each copper tube, and the outer end faces of the copper tubes are in contact fit with the inner side walls of the sound absorbing cotton.

5. The transformer noise elimination and reduction system according to claim 4, wherein a plurality of noise elimination plates with the plate surfaces perpendicular to the main shaft of the copper pipe are arranged in the copper pipe, the noise elimination plates are uniformly distributed at intervals in the axial direction of the copper pipe, honeycomb noise elimination plates are also plugged at the outer ends of the copper pipe, and a plurality of polygonal holes are formed in the plate surfaces of the honeycomb noise elimination plates in a penetrating mode.

6. The transformer sound attenuation and noise reduction system according to claim 1 or 2, wherein the sound attenuation unit extends in a closed ring shape along a circumferential direction of the sound insulation barrier; the sound wave transmitting units are distributed in a plurality along the circumferential direction of the sound insulation barrier at intervals; the first sensor and the second sensor are corresponding to each other in the circumferential direction of the sound insulation barrier and are respectively arranged close to the same sound wave transmitting unit.

7. Transformer noise-reducing method for noise-reducing by using the transformer noise-reducing system according to any one of claims 1 to 6, characterized by comprising the steps of:

S100: the first sensor collects an initial noise signal of the transformer and transmits the initial noise signal to the silencing controller; the second sensor collects the tail end noise signal of the transformer and transmits the tail end noise signal to the silencing controller;

S200: the silencing controller calculates an actual noise difference value between the initial noise signal and the tail end noise signal according to a first preset program;

S300: if the actual noise difference value is smaller than the preset noise difference value, the silencing controller sends a driving instruction to a driving piece so that the driving piece drives the sound wave transmitting unit to vertically swing for a preset angle and then stop;

S400: repeating the steps S100 to S300 until the actual noise difference is equal to or smaller than the preset noise difference.