CN112562999A - Noise reduction device for dry-type transformer - Google Patents
Noise reduction device for dry-type transformer Download PDFInfo
- Publication number
- CN112562999A CN112562999A CN202011273314.0A CN202011273314A CN112562999A CN 112562999 A CN112562999 A CN 112562999A CN 202011273314 A CN202011273314 A CN 202011273314A CN 112562999 A CN112562999 A CN 112562999A
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- Prior art keywords
- noise reduction
- dry
- fixedly connected
- reduction device
- metal mesh
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/33—Arrangements for noise damping
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
- A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
- A62C37/40—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone with electric connection between sensor and actuator
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/085—Cooling by ambient air
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire Alarms (AREA)
Abstract
The invention discloses a noise reduction device for a dry-type transformer, which comprises a shell, wherein a fireproof plate is fixedly connected to the inner wall of the shell, a sound absorption plate is fixedly connected to the inner side of the fireproof plate, and a sound insulation plate is arranged on the inner side of the sound absorption plate; the bottom of the inner side of the sound insulation board is fixedly connected with a cushion block, the top end of the cushion block is fixedly connected with a spring damping shock absorber, and the top end of the spring damping shock absorber is elastically connected with a transformer main body; the top end of the inner side of the sound insulation board is fixedly connected with a temperature sensor, a smoke sensor and an automatic fire extinguisher; the top end of the shell is fixedly connected with a fan, the output end of the fan is fixedly connected with a blowpipe, and the blowpipe is communicated to the inner side of the sound insulation board. The noise reduction device of the dry-type transformer has the characteristics of excellent fireproof performance, excellent noise reduction effect and the like.
Description
Technical Field
The invention relates to the field of transformers, in particular to a noise reduction device of a dry-type transformer.
Background
The dry-type transformer is widely used in places such as local lighting, high-rise buildings, airports, wharf CNC mechanical equipment and the like, and simply, the dry-type transformer refers to a transformer with AN iron core and a winding which are not immersed in insulating oil, the cooling mode includes natural air cooling (AN) and forced air cooling (AF), the transformer can continuously run for a long time under the rated capacity during natural air cooling, and the output capacity of the transformer can be improved by 50% during forced air cooling. The device is suitable for intermittent overload operation or emergency accident overload operation; because the load loss and the impedance voltage amplification are large during overload and the device is in a non-economic operation state, the device is not required to be in continuous overload operation for a long time. However, the current transformer is easy to generate noise during working to affect the life of users, and accidents of fire easily occur when the transformer works for a long time, which may cause significant economic loss and life danger to users if the transformer cannot be processed in time.
Disclosure of Invention
Correspondingly, the invention provides a noise reduction device of a dry-type transformer, which comprises a shell, wherein a fireproof plate is fixedly connected to the inner wall of the shell, a sound absorption plate is fixedly connected to the inner side of the fireproof plate, and a sound insulation plate is arranged on the inner side of the sound absorption plate;
the bottom of the inner side of the sound insulation board is fixedly connected with a cushion block, the top end of the cushion block is fixedly connected with a spring damping shock absorber, and the top end of the spring damping shock absorber is elastically connected with a transformer main body;
the top end of the inner side of the sound insulation board is fixedly connected with a temperature sensor, a smoke sensor and an automatic fire extinguisher;
the top end of the shell is fixedly connected with a fan, the output end of the fan is fixedly connected with a blowpipe, and the blowpipe is communicated to the inner side of the sound insulation board.
In an alternative embodiment, the blow pipe is provided with a drying layer on one end inside the acoustic panel.
In an optional embodiment, the shell is provided with an access door, and the access door is provided with a handle.
In an optional embodiment, the casing is provided with a heat dissipation window, and the heat dissipation window is internally provided with a screen.
In an optional implementation mode, the shell is further provided with an alarm lamp, and the alarm lamp is electrically connected with the automatic fire extinguisher and the smoke sensor respectively.
In an optional embodiment, the temperature sensor is electrically connected to the fan.
In an optional embodiment, the number of the cushion blocks is provided with a plurality of cushion blocks, the cushion blocks are made of elastic rubber materials, and the height of the spring damping shock absorber is one hundred millimeters.
In an alternative embodiment, the soundproof panel includes a metal mesh support, the metal mesh support is used as a framework, and soundproof layers are formed on both sides of the metal mesh support based on a flame retardant material.
In an optional embodiment, the soundproof layer is pre-occupied on the side close to the metal mesh bracket based on a degradable material in a forming process, so that a plurality of silencing bar holes are formed on the side close to the metal mesh bracket.
In an optional embodiment, during the forming process of the sound insulation layer, inert gas is introduced into one side of the sound insulation layer far away from the metal mesh support, so that a plurality of oscillating holes with different sizes are formed inside one side of the sound insulation layer far away from the metal mesh support.
In conclusion, the invention provides the noise reduction device for the dry-type transformer, which has the characteristics of excellent fireproof performance, excellent noise reduction effect and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of an overall structure of a noise reduction device for a dry-type transformer according to the present invention;
fig. 2 is a schematic view of an internal structure of a noise reduction device of a dry-type transformer according to the present invention;
FIG. 3 is a partial enlarged view of the sectional structure of the noise reduction device of the dry transformer according to the present invention;
fig. 4 is a partial enlarged view of a in fig. 2 according to the present invention.
Illustration of the drawings:
a housing 1; a fire protection plate 2; a sound-absorbing panel 3; a sound insulating panel 4; a cushion block 5; a spring-damped shock absorber 6; a transformer main body 7; a foam board 9; a temperature sensor 10; a smoke sensor 11; an automatic fire extinguisher 12; a fan 13; a blowpipe 14; an alarm lamp 15; a heat radiation window 16; a screen 17; an access door 18; a handle 10; a drying layer 20; a sound deadening strip aperture 902; a shaking hole 901; a wire mesh support 903.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1-4, an embodiment of the invention provides a noise reduction device for a dry-type transformer, which includes a housing 1, wherein a fireproof plate 2 is fixedly connected to an inner wall of the housing 1, an acoustic board is fixedly connected to an inner side of the fireproof plate 2, and an acoustic board 4 is arranged on the inner side of the acoustic board; the bottom of the inner side of the sound insulation board 4 is fixedly connected with a cushion block 5, the top end of the cushion block 5 is fixedly connected with a spring damping shock absorber 6, and the top end of the spring damping shock absorber 6 is elastically connected with a transformer main body 7; the top end of the inner side of the sound insulation board 4 is fixedly connected with a temperature sensor 10, a smoke sensor 11 and an automatic fire extinguisher 12; the top end of the shell 1 is fixedly connected with a fan 13, the output end of the fan 13 is fixedly connected with an air outlet pipe 14, and the air outlet pipe 14 is communicated to the inner side of the sound insulation board 4.
Optionally, one end of the air outlet pipe 14 located inside the sound insulation board 4 is provided with a drying layer 20.
Optionally, an access door 18 is disposed on the housing 1, and a handle 10 is disposed on the access door 18.
Optionally, a heat dissipation window 16 is arranged on the housing 1, and a screen 17 is arranged in the heat dissipation window 16.
Optionally, an alarm lamp 15 is further disposed on the housing 1, and the alarm lamp 15 is electrically connected to the automatic fire extinguisher 12 and the smoke sensor 11, respectively.
Optionally, the temperature sensor 10 is electrically connected to the fan 13.
Optionally, the number of the cushion blocks 5 is multiple, the cushion blocks 5 are made of elastic rubber materials, and the height of the spring damping shock absorber 6 is one hundred millimeters.
Optionally, the soundproof plate 4 includes a metal mesh support 903, the metal mesh support 903 serves as a framework, and soundproof layers are formed on both sides of the metal mesh support 903 based on a flame retardant material.
Optionally, during the forming process of the soundproof layer, a space is pre-occupied on the side close to the metal mesh support 903 based on the degradable material, so that a plurality of silencing bar holes 902 are formed on the side close to the metal mesh support 903 of the soundproof layer.
Optionally, in the forming process of the sound insulation layer, an inert gas is introduced into a side of the sound insulation layer away from the metal mesh support 903, so that a plurality of oscillating holes 901 with different sizes are formed in the inside of the side of the sound insulation layer away from the metal mesh support 903.
Specifically, the design concept of the sound insulation board according to the embodiment of the present invention is that the sound insulation board is the innermost component, and needs to be connected and fixed with the spring damping shock absorber 6, and the sound insulation board itself needs to have a certain strength, and if the sound insulation board is formed by only using a flame retardant material (generally, high ignition point plastic), the sound insulation board itself has insufficient rigidity, and is easily affected by vibration and generates a larger noise; therefore, the embodiment of the present invention uses the metal mesh bracket 903 as a framework (compared with a metal plate, it is easy to form a flame retardant material as a bracket); specifically, the metal mesh support 903 may extend a plurality of elongated metal needles to both sides, and the metal needles serve to increase the molding contact area of the flame retardant material and improve the connection firmness of the flame retardant material and the frame, and on the other hand, the metal needles themselves may absorb energy (sound) by means of energy transfer, and rapidly consume energy by using ultra-low frequency vibration through the advantage of high rigidity (characteristics of their own material and connection to the frame); on the basis, firstly, inert gas is introduced into the side far away from the metal mesh support 903, so that a plurality of oscillating holes 901 with different sizes are formed in the side far away from the metal mesh support 903 of the sound insulation layer, and the oscillating holes 901 can enable sound to oscillate back and forth in a spherical space with difficult size, so that the sound frequency of the sound is changed, thereby converting noise close to the frequency into noise with larger frequency difference, and preventing resonance superposition of the sound; further, the space occupied by the degradable material is reserved near the side of the metal mesh support 903, so that the sound insulation layer forms a plurality of sound attenuation bar holes 902 near the side of the metal mesh support 903. The degradable material can be removed after the sound insulation layer is formed through high temperature, solution treatment and the like, and the correspondingly formed silencing strip hole 902 can filter partial noise (particularly high-frequency short wave) by utilizing a long and thin gap.
In specific implementation, the fireproof plate 2 is used for preventing fire from spreading, the sound absorption plate 3 is used for absorbing noise, and the sound insulation plate 4 is used for increasing the sound insulation effect; the temperature sensor 10 is used for detecting temperature, the smoke sensor 11 is used for detecting fire smoke, the automatic fire extinguisher 12 is used for automatically extinguishing fire, and the fan 13 and the air outlet pipe 14 are convenient for heat dissipation operation.
The working principle is as follows: when the device is used, foundation bolts of the transformer main body 7 are loosened, the transformer main body 7 is jacked up at one end by using a hydraulic claw jack, and a supporting block is padded in the transformer main body; the other end of the transformer body 7 is jacked up by a hydraulic claw jack, and a spring damping shock absorber 6 is padded and fixed with the cushion block 5; repeated operation, install under four feet of transformer main part 7, use the level bar, the fixed screw on the adjusting spring damping bumper shock absorber 6, level transformer main part 7 after fixed firm, place cystosepiment 9 again and close access door 18 in the draw-in groove and can use, transformer main part 7 during operation inhales the sound insulation operation through acoustic celotex board 4 and abatvoix 3, and carry out the bradyseism through spring damping bumper shock absorber 6 and cystosepiment 9 and reduce the noise, make automatic fire extinguisher 12 work through smoke transducer 11 response when the conflagration breaing out and put out a fire the operation, when taking place high temperature, temperature sensor 10 responds to make fan 13 blow through air-out pipe 14 and carry out the heat dissipation operation.
In summary, the embodiment of the invention provides a noise reduction device for a dry-type transformer, which has the characteristics of excellent fire resistance, excellent noise reduction effect and the like.
The noise reduction device and the noise reduction system for the dry-type transformer provided by the embodiment of the invention are described in detail, a specific example is applied in the text to explain the principle and the embodiment of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A noise reduction device for a dry-type transformer comprises a shell and is characterized in that a fireproof plate is fixedly connected to the inner wall of the shell, a sound absorption plate is fixedly connected to the inner side of the fireproof plate, and a sound insulation plate is arranged on the inner side of the sound absorption plate;
the bottom of the inner side of the sound insulation board is fixedly connected with a cushion block, the top end of the cushion block is fixedly connected with a spring damping shock absorber, and the top end of the spring damping shock absorber is elastically connected with a transformer main body;
the top end of the inner side of the sound insulation board is fixedly connected with a temperature sensor, a smoke sensor and an automatic fire extinguisher;
the top end of the shell is fixedly connected with a fan, the output end of the fan is fixedly connected with a blowpipe, and the blowpipe is communicated to the inner side of the sound insulation board.
2. A dry transformer noise reduction device according to claim 1, wherein the blow pipe is provided with a drying layer on the end inside the baffle.
3. A dry-type transformer noise reduction device according to claim 1, wherein the housing is provided with an access door, and the access door is provided with a handle.
4. A dry-type transformer noise reduction device according to claim 1, wherein the housing is provided with a heat dissipation window, and a screen is arranged in the heat dissipation window.
5. A dry-type transformer noise reduction device as claimed in claim 1, wherein the housing is further provided with a warning lamp, and the warning lamp is electrically connected with the automatic fire extinguisher and the smoke sensor respectively.
6. A dry transformer noise reduction device according to claim 1, wherein the temperature sensor is electrically connected to a fan.
7. A dry-type transformer noise reduction device according to claim 1, wherein the number of the cushion blocks is provided in plurality, the cushion blocks are made of elastic rubber materials, and the height of the spring damping shock absorber is one hundred millimeters.
8. A dry-type transformer noise reduction device according to any of claims 1 to 7, characterized in that the noise insulation board comprises a metal mesh support, the metal mesh support is used as a framework, and noise insulation layers are formed on two sides of the metal mesh support based on flame retardant materials.
9. A dry transformer noise reduction device as claimed in claim 8, wherein the noise insulation layer is pre-occupied during the forming process on the side close to the metal mesh support based on degradable material, so that the noise insulation layer forms a plurality of noise damping bar holes on the side close to the metal mesh support.
10. A dry transformer noise reduction device as claimed in claim 8, wherein during the forming process of the noise insulation layer, an inert gas is introduced into a side away from the metal mesh support, so that a plurality of oscillating holes with different sizes are formed inside the side away from the metal mesh support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011273314.0A CN112562999B (en) | 2020-11-13 | 2020-11-13 | Noise reduction device for dry-type transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011273314.0A CN112562999B (en) | 2020-11-13 | 2020-11-13 | Noise reduction device for dry-type transformer |
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| CN112562999A true CN112562999A (en) | 2021-03-26 |
| CN112562999B CN112562999B (en) | 2022-08-30 |
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| CN202011273314.0A Active CN112562999B (en) | 2020-11-13 | 2020-11-13 | Noise reduction device for dry-type transformer |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU20750U1 (en) * | 2001-05-16 | 2001-11-27 | Открытое акционерное общество "АВТОВАЗ" | MOBILE NOISE-PROTECTING SCREEN |
| CN101334993A (en) * | 2008-08-04 | 2008-12-31 | 中国科学院力学研究所 | Noise absorbing compound material based on network construction and preparing method thereof |
| EP2337019A1 (en) * | 2009-12-10 | 2011-06-22 | Jochen Zingelmann | Acoustic absorption device, in particular for transport routes and vehicles |
| JP2013023962A (en) * | 2011-07-25 | 2013-02-04 | Panasonic Corp | Sound insulation panel |
| CN206271498U (en) * | 2016-09-30 | 2017-06-20 | 上海坤旸新材料科技有限公司 | Dismountable dry-type transformer protection noise reduction shell |
| CN206553966U (en) * | 2017-01-16 | 2017-10-13 | 贵州省交通科学研究院股份有限公司 | A kind of both sides of the road sound barrier sheet |
| CN107574950A (en) * | 2017-10-09 | 2018-01-12 | 常州金艺广告传媒有限公司 | A kind of preparation method for the light composite wall that insulates against sound |
| RU2646876C1 (en) * | 2017-06-14 | 2018-03-12 | Олег Савельевич Кочетов | Method of protecting the operator from production noise |
| RU2656440C1 (en) * | 2017-06-14 | 2018-06-05 | Олег Савельевич Кочетов | Method of sound insulation of equipment and sound-insulating fencing |
| CN109703133A (en) * | 2018-11-30 | 2019-05-03 | 安徽吉露科技有限公司 | A kind of composite board with soundproof effect |
| CN109796218A (en) * | 2018-12-30 | 2019-05-24 | 镇江海利新材料科技有限公司 | A kind of preparation method of rayon-based carbon fiber composite material meeting room abatvoix |
| CN110819102A (en) * | 2019-11-07 | 2020-02-21 | 徐州飞云泡沫制品有限责任公司 | Antibacterial polyurethane foam board gives sound insulation |
-
2020
- 2020-11-13 CN CN202011273314.0A patent/CN112562999B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU20750U1 (en) * | 2001-05-16 | 2001-11-27 | Открытое акционерное общество "АВТОВАЗ" | MOBILE NOISE-PROTECTING SCREEN |
| CN101334993A (en) * | 2008-08-04 | 2008-12-31 | 中国科学院力学研究所 | Noise absorbing compound material based on network construction and preparing method thereof |
| EP2337019A1 (en) * | 2009-12-10 | 2011-06-22 | Jochen Zingelmann | Acoustic absorption device, in particular for transport routes and vehicles |
| JP2013023962A (en) * | 2011-07-25 | 2013-02-04 | Panasonic Corp | Sound insulation panel |
| CN206271498U (en) * | 2016-09-30 | 2017-06-20 | 上海坤旸新材料科技有限公司 | Dismountable dry-type transformer protection noise reduction shell |
| CN206553966U (en) * | 2017-01-16 | 2017-10-13 | 贵州省交通科学研究院股份有限公司 | A kind of both sides of the road sound barrier sheet |
| RU2646876C1 (en) * | 2017-06-14 | 2018-03-12 | Олег Савельевич Кочетов | Method of protecting the operator from production noise |
| RU2656440C1 (en) * | 2017-06-14 | 2018-06-05 | Олег Савельевич Кочетов | Method of sound insulation of equipment and sound-insulating fencing |
| CN107574950A (en) * | 2017-10-09 | 2018-01-12 | 常州金艺广告传媒有限公司 | A kind of preparation method for the light composite wall that insulates against sound |
| CN109703133A (en) * | 2018-11-30 | 2019-05-03 | 安徽吉露科技有限公司 | A kind of composite board with soundproof effect |
| CN109796218A (en) * | 2018-12-30 | 2019-05-24 | 镇江海利新材料科技有限公司 | A kind of preparation method of rayon-based carbon fiber composite material meeting room abatvoix |
| CN110819102A (en) * | 2019-11-07 | 2020-02-21 | 徐州飞云泡沫制品有限责任公司 | Antibacterial polyurethane foam board gives sound insulation |
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| CN112562999B (en) | 2022-08-30 |
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