CN105762677B - A kind of three-phase high impedance high voltage silicon rectifier device - Google Patents
A kind of three-phase high impedance high voltage silicon rectifier device Download PDFInfo
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- CN105762677B CN105762677B CN201610168472.7A CN201610168472A CN105762677B CN 105762677 B CN105762677 B CN 105762677B CN 201610168472 A CN201610168472 A CN 201610168472A CN 105762677 B CN105762677 B CN 105762677B
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- tank wall
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/56—Cooling; Ventilation
- H02B1/565—Cooling; Ventilation for cabinets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The invention provides a kind of three-phase high impedance high voltage silicon rectifier device, including casing, high pressure silicon rectifying transformer and temperature control device, the high pressure silicon rectifying transformer is connected with three phase mains control system, the high pressure silicon rectifying transformer and temperature control device are located at the inside of casing and are secured to connection, device also is driven including ultrasonic wave insect, the ultrasonic wave insect drives device positioned at the side of casing and is secured to connection；Tank wall is dried in the air inlet that the noise control radiating tank wall and 2 faces that the casing is disposed adjacent including case lid, bottom, 2 faces are disposed adjacent, the upper and lower side that tank wall is dried in the noise control radiating tank wall and air inlet is fixedly connected with case lid and bottom respectively, and the noise control radiating tank wall and air inlet are dried tank wall and be oppositely arranged.The present invention ensure that the radiating effect of three-phase high impedance high voltage silicon rectifier device as far as possible in the case where ensureing low noise, and can effectively prevent insect agglomeration economies equipment normal work.
Description
Technical field
The present invention relates to power equipment structure-design technique field, more particularly to a kind of three-phase high impedance high voltage silicon rectifier
Device.
Background technology
Traditional transformer is concentrated design box by three-phase high impedance high voltage silicon rectifier device (generally referred to as " case change ")
In housing, with small volume, lightweight, low noise, low-loss, high reliability, be widely used in residential quarters, commercial center,
The places such as light station, airport, factories and miness, enterprise, hospital, school.Three-phase high impedance high voltage silicon rectifier device holds in the course of the work
Be also easy to produce substantial amounts of noise, easily influence surrounding residential subscribers normal life, in the prior art often using encapsulation process come
Cut-off noise reaches the effect abated the noise.However, Seal Design often causes three-phase high impedance high voltage silicon rectifier device
Internal heat is difficult to scatter and disappear.Because the thermal diffusivity of three-phase high impedance high voltage silicon rectifier device in itself is low, if come out
Heat can not evacuate out in time so that cause temperature rise influence original paper steady operation.In the prior art generally using peace
Scavenger fan, labyrinth structure tank wall are filled, strengthens ventilation effect, it is ensured that temperature is not exceeded.In order to avoid reduction capacity, in heavy duty
Also want quenching.Then carrying out radiating in this way will cause the internal noise produced easily to dissipate, and dry
Also substantial amounts of noise can be produced.
For example disclosed in Chinese patent CN105305277A a kind of high stability noise-proofing three-phase high impedance high voltage silicon is whole
Flowing below device, including main box (2), described main box has underground box (15), described main box and underground box
It is provided with solar panel (1) above connection, described main box, internal control is provided with the madial wall of described main box
Scavenger fan (11) is provided with device (12) processed, the lateral wall of described main box, described main box passes through inside door (14)
It is connected with described underground box.The noise-proofing three-phase high impedance high voltage silicon rectifier device is reduced by increasing stability
Noise, noise reduction effect is poor.
In another example a kind of cooling system of box type transformer disclosed in Chinese patent CN202150649U, described box change
The cooling system of depressor, including casing, high powered device and low-voltage distribution equipment, it is characterised in that：Low-voltage distribution equipment
Return cable line inlet port installs axial flow blower, and two side doors of low-voltage distribution equipment are also provided with axial flow blower, axial flow blower connection
Control device.Each one axial flow blower of increase at each return cable line inlet port of low-voltage distribution equipment, its wind direction is from lower past
On blow, low-voltage distribution equipment two side doors respectively increase an axial flow blower, hot blast in low-voltage distribution equipment can be made smoothly to arrange
Go out.Described control device is temperature controller, and the temp probe of temperature controller is arranged on the top of low-voltage distribution equipment.
Described temperature controller is device that is conventional or can realizing, and the temperature of low-voltage distribution equipment is sensed by temp probe,
Opening, stopping for each axial flow blower is controlled by temperature controller, with reference to the concrete condition of box type transformer, is preferably started axial flow blower
Temperature is set to 50 DEG C, and axial flow blower stops temperature and is set to 40 DEG C.The cooling system of the box type transformer is dried by axial flow blower
Noise is larger in radiating, its course of work, and can not reduce the noise produced inside box type transformer.
The content of the invention
To overcome the radiating of three-phase high impedance high voltage silicon rectifier device present in prior art and noise-proofing not to can both
The problem of taking into account, the invention provides a kind of three-phase high impedance high voltage silicon rectifier device.
A kind of three-phase high impedance high voltage silicon rectifier device, including casing, high pressure silicon rectifying transformer and temperature control device, institute
State high pressure silicon rectifying transformer and temperature control device is located at the inside of casing and is secured to connection, in addition to ultrasonic wave insect is driven
Device, the ultrasonic wave insect drives device positioned at the side of casing and is secured to connection；The casing includes case lid, bottom, 2 faces
Tank wall is dried in the air inlet that the noise control radiating tank wall being disposed adjacent and 2 faces are disposed adjacent, and the noise control radiating tank wall and air inlet are dried
The upper and lower side of tank wall is fixedly connected with case lid and bottom respectively, and the noise control radiating tank wall and air inlet are dried tank wall and be oppositely arranged.
Further, the noise control radiating tank wall includes blower fan, bending ventilating duct and noise reduction packed layer, and the blower fan is located at
Bend the outer end of ventilating duct and be secured to connection, the bending ventilating duct is fixedly connected with noise reduction packed layer, and the noise reduction is filled out
Fill layer to be arranged at intervals with bending ventilating duct, the bending ventilating duct inner port on the inside of noise control radiating tank wall with being fixedly connected；It is described
Blower fan is connected with temperature control device by electric wire.
Further, the noise reduction packed layer includes sound-isolating sponge layer and asbestos stratum reticulare, the sound-isolating sponge layer and asbestos
Stratum reticulare is fixedly connected.
Further, the hollow bending ventilating duct that raised lines is carried for inwall of the bending ventilating duct.
Further, tank wall is dried in the air inlet includes filter screen mouthful, bending aeration-drying layer and air intake noise reduction packed layer, institute
The external port that filter screen mouthful is located at bending aeration-drying layer is stated, the filter screen mouthful is flexibly connected with bending aeration-drying layer, described curved
Folding aeration-drying layer is fixedly connected with air intake noise reduction packed layer, and the bending aeration-drying layer and air intake noise reduction packed layer interval are set
Put, the inner port of the air intake noise reduction packed layer is fixedly connected with the inwall that tank wall is dried in air inlet.
Further, the air intake noise reduction packed layer includes sound-isolating sponge layer and asbestos stratum reticulare, sound-isolating sponge layer and
Asbestos stratum reticulare is fixedly connected.
Further, the drier that is internally provided with for bending aeration-drying layer, the drier is done with bending ventilation
Dry layer is fixedly connected.
Further, the temperature control device includes temperature-detecting device and control device, the temperature-detecting device and control
Device processed passes through electrical connection.
Further, the temperature-detecting device is infra-red thermometer.
Further, the ultrasonic wave insect, which drives device, includes power supply, wave frequency controller, wave frequency converter and ultrasonic wave hair
Raw oscillating circuit, the wave frequency controller, wave frequency converter and ultrasonic wave occur oscillating circuit respectively with power electric connection, it is described
Wave frequency controller and wave frequency converter occur oscillating circuit with ultrasonic wave and electrically connected.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) tank wall, profit are dried in the noise control radiating tank wall that the present invention is disposed adjacent by 2 faces and the air inlet that 2 faces are disposed adjacent
The heat for taking away the generation of high pressure silicon rectifying transformer with blower fan generation air-flow reaches the effect of radiating, and air-flow flows transversely through height
Press silicon rectifying transformer, good heat dissipation effect.
(2) present invention is coordinated by bending ventilating duct and noise reduction packed layer, bending aeration-drying layer and air intake noise reduction filling
Layer coordinates, it is to avoid air-flow direct current causes noise directly to diffuse out, and passes through noise reduction packed layer and air intake noise reduction packed layer will
The noise attenuation intensity spread by box body wall, so as to reach the effect for reducing noise, and ensure that by fan induced draught
Radiating effect.
(3) noise reduction packed layer of the invention and air intake noise reduction packed layer pass through compacting by sound-isolating sponge layer and asbestos stratum reticulare
Shaping, both ensure that noise eradicating efficacy in turn ensure that its intensity.
(4) present invention is compared to control by temperature control device according to the temperature and the temperature of internal preset that detect
The break-make of blower fan, realize the regulation and control to three-phase high impedance high voltage silicon rectifier device internal temperature so as to preventing temperature too high or
Person is too low, influences the normal work of equipment.
(5) drier is filled with bending aeration-drying of the invention layer, and using molecular sieve as drier, can be with
Realize and recycle, reduce cost, while ensure that the air into inside three-phase high impedance high voltage silicon rectifier device is
Dry air, so that it is guaranteed that internal equipment will not influence normal work because humidity is too low.
(6) present invention drives the ultrasonic wave that device produces the frequency range that can drive insect by ultrasonic wave insect, so as to realize
Environmentally friendly expelling parasite, effectively avoids the normal of spring and summer insect agglomeration economies three-phase high impedance high voltage silicon rectifier device
Operation.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the present invention；
Fig. 2 is the structural representation of the noise control radiating tank wall of the present invention；
Fig. 3 is the structural representation of the noise reduction packed layer of the present invention；
Fig. 4 is the air intake noise reduction packed layer structural representation of the present invention.
Embodiment
Below in conjunction with drawings and examples, the present invention will be described in further detail.It should be appreciated that described herein
Specific embodiment only to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, Figure 2 and Fig. 3, present embodiment discloses a kind of three-phase high impedance high voltage silicon rectifier device, wraps
Casing 1, high pressure silicon rectifying transformer 2 and temperature control device 3 are included, high pressure silicon rectifying transformer 2 and temperature control device 3 are located at casing 1
It is internal and be connected by screw with it or other are fixedly connected with mode by riveting etc., in addition, present invention additionally comprises super
Sound wave insect drives device 4, and ultrasonic wave insect drives device 4 positioned at the side of casing 1 and is fixedly connected with it by screw.It is preferred that
, high pressure silicon rectifying transformer 2 is provided with three phase mains control system, and high pressure silicon rectifier is become by three phase mains control system
Depressor 2 carries out intelligent control.
Specifically, reference picture 1, the noise control radiating tank wall 13 and 2 that casing 1 is disposed adjacent including case lid 11, bottom 12,2 faces
Tank wall 14 is dried in air inlet that face is disposed adjacent, noise control radiating tank wall 13 and air inlet dry the upper and lower side of tank wall 14 respectively with case lid 11
It is fixedly connected with bottom 12, noise control radiating tank wall 13 and air inlet are dried tank wall 14 and be oppositely arranged.By the way that just to setting, gas can be allowed
Stream passes across high pressure silicon rectifying transformer 2, heat is easily dispersed.It is preferred that, the antiseepage of the sound-absorbing sponge built in of case lid 11
Runout lid, on the one hand ensures sealing, on the other hand prevents noise from being spread from top.
As preferred, reference picture 1, noise control radiating tank wall 13 includes blower fan 131, bending ventilating duct 132 and noise reduction filling
Layer 133, blower fan 131 is located at the outer end of bending ventilating duct 132 and is fixedly connected with it by screw, bends ventilating duct 132 and disappears
Sound packed layer 133 is using compressing.It is preferred that, the outside of bending ventilating duct 132 and noise reduction packed layer 133 is fixedly connected with three
Phase high impedance high voltage silicon rectifier device outer stationary plates, and fixed plate is made up of anti-corrosion sheet material.Noise reduction packed layer 133 with it is curved
Folding ventilating duct 132 is arranged at intervals, and the bending inner port of ventilating duct 132 is fixedly connected with the inner side of noise control radiating tank wall 13；Noise reduction is filled
Layer 133 is staggeredly molded in bending with bending ventilating duct 132.And blower fan 131 is connected with temperature control device 3 by electric wire, pass through temperature
Control device 3 can control the break-make of blower fan 131 to realize temperature control.Exceed default temperature in control device 3 in temperature
At 25 DEG C, the control blower fan 131 of control device 3 is opened the high temperature air row inside three-phase high impedance high voltage silicon rectifier device
Go out, and by outside Cryogenic air by air inlet dry tank wall 14 suck inside three-phase high impedance high voltage silicon rectifier device so that
High pressure silicon rectifying transformer is obtained further to radiate by way of heat transfer.When temperature is less than default temperature in control device 3
When spending 25 degrees Celsius, then the control of control device 3 blower fan 131 is closed, and now high pressure silicon rectifying transformer is produced in the course of the work
Heat to keep the normal working temperature of three-phase high impedance high voltage silicon rectifier device to ensure that equipment running is normal.
It is preferred that, reference picture 2, noise reduction packed layer 133 includes sound-isolating sponge layer 1331 and asbestos stratum reticulare 1332, sound-isolating sponge
Layer 1331 and asbestos stratum reticulare 1332 are using compressing.It is combined using sound-isolating sponge layer 1331 and asbestos stratum reticulare 1332, one
Aspect ensure that the intensity of noise reduction packed layer 133, on the other hand ensure that noise using the strong sound-absorbing effect of spongy layer 1331
Effectively eliminate.And to prevent noise from being shed by bending ventilating duct 132, bend ventilating duct 132 is that inwall carries raised line
The hollow bending ventilating duct on road, can so make it that diffraction occurs in bending ventilating duct 132 for noise and reflection is made an uproar so as to weaken
The intensity of speech ripple, so as to reach the effect for weakening noise.
As preferred, reference picture 1, tank wall 14 is dried in air inlet to be included filter screen mouthful 141, bending aeration-drying layer 142 and enters
Wind noise reduction packed layer 143, filter screen mouthful 141 is located at the external port of bending aeration-drying layer 142, and filter screen mouthful 141 and bending ventilation are dry
Dry layer 142 is flexibly connected by detachable pivot pin, and bending aeration-drying layer 142 and air intake noise reduction packed layer 143 are by being pressed into
Type, bending aeration-drying layer 142 and air intake noise reduction packed layer 143 are arranged at intervals, and the inner port of air intake noise reduction packed layer 143 is with entering
The inwall that gas dries tank wall 14 is fixedly connected by screw.Wherein, filter screen mouthful 141 is wiped with fine and close wire netting as filter screen, its jail
The effect of soundness and blocks dust is all relatively good.When blower fan 131 is opened, outside air will be by bending aeration-drying layer
142 enter inside three-phase high impedance high voltage silicon rectifier device, and by air intake noise reduction packed layer 143 to interior noise
Eliminate to ensure the working condition of low noise.
It is preferred that, reference picture 3, air intake noise reduction packed layer 143 includes sound-isolating sponge layer 1431 and asbestos stratum reticulare 1432, sound insulation
Spongy layer 1431 and asbestos stratum reticulare 1432 are using compressing.Bend aeration-drying layer 142 is internally provided with drier 1421,
Drier 1421 is connected with bending aeration-drying layer 142 by bonding way.Drier 1421 is preferably molecular sieve desiccant, point
Son sieve drier, which has the advantages that to repeat, to be utilized, can be by if high temperature or dry environment is run into after having adsorbed moisture
Moisture sloughs the effect for reaching and recycling, and has saved cost.
In addition, reference picture 1, temperature control device 3 includes temperature-detecting device 31 and control device 32, temperature-detecting device 31
Pass through electrical connection with control device 32.It is preferred that, temperature-detecting device 31 is infra-red thermometer.Infra-red thermometer is called red
Outer temperature measurer is made up of the part such as optical system, photodetector, signal amplifier and signal transacting, display output.Optical system
System converges the Target Infrared Radiation energy in its visual field, and the size of visual field is determined by the optical element and its position of temperature measurer.It is red
Outer energy focuses on photodetector and is changed into corresponding electric signal.The signal passes through amplifier and signal processing circuit,
And according to the temperature value for being changed into measured target after algorithm and the backs correction treated in instrument.Its detection error is relatively
It is small and convenient and practical, acquisition environment temperature and device temperature that can be instant.In running, pass through temperature-detecting device 31
Temperature inside moment detection three-phase high impedance high voltage silicon rectifier device, control device 32 judges and controls opening for blower fan 131
Open and power off.
In addition, reference picture 4, ultrasonic wave insect, which drives device 4, includes power supply 41, wave frequency controller 42, the and of wave frequency converter 43
Oscillating circuit 44 occurs for ultrasonic wave, wave frequency controller 42, wave frequency converter 43 and ultrasonic wave occur oscillating circuit 44 respectively with electricity
Source 41 is electrically connected, and wave frequency controller 42 and wave frequency converter 43 occur oscillating circuit 44 with ultrasonic wave and electrically connected.Wherein, wave frequency control
The control of device 42 ultrasonic wave processed occurs the work of oscillating circuit 44 and produces ultrasonic wave, and vibration electricity occurs for the control ultrasonic wave of wave frequency converter 43
The frequency for the ultrasonic wave that road 44 is produced simultaneously is switched over, and as preferred, 10000Hz ultrasonic wave is used in this specific embodiment
Insect is driven in progress.Time opening ultrasonic wave insect, which drives device 4, when gathering in spring and summer insect can drive three-phase
Insect inside high impedance high voltage silicon rectifier device, it is to avoid the normal operation of insect agglomeration economies equipment.
The preferred embodiments of the present invention have shown and described in described above, as previously described, it should be understood that not office of the invention
Be limited to form disclosed herein, be not to be taken as the exclusion to other embodiment, and available for various other combinations, modification and
Environment, and can be changed in invention contemplated scope described herein by the technology or knowledge of above-mentioned teaching or association area
It is dynamic., then all should be appended by the present invention and the change and change that those skilled in the art are carried out do not depart from the spirit and scope of the present invention
In scope of the claims.
Claims (9)
1. a kind of three-phase high impedance high voltage silicon rectifier device, including casing (1), high pressure silicon rectifying transformer (2) and temperature control dress
Put (3), the high pressure silicon rectifying transformer (2) and temperature control device (3) are located at the inside of casing (1) and are secured to connection, its
It is characterised by：Device (4) also is driven including ultrasonic wave insect, the ultrasonic wave insect drives device (4) and is located at the side of casing (1) simultaneously
It is secured to connection；The casing (1) includes case lid (11), bottom (12), 2 faces are disposed adjacent noise control radiating tank wall (13) and
Tank wall (14) is dried in the air inlet that 2 faces are disposed adjacent, and the upper and lower side of tank wall (14) is dried in the noise control radiating tank wall (13) and air inlet
It is fixedly connected respectively with case lid (11) and bottom (12), the noise control radiating tank wall (13) and air inlet are dried tank wall (14) and set relatively
Put；The noise control radiating tank wall (13) includes blower fan (131), bending ventilating duct (132) and noise reduction packed layer (133), the wind
Machine (131) is located at the outer end of bending ventilating duct (132) and is secured to connection, the bending ventilating duct (132) and noise reduction filling
Layer (133) is fixedly connected, and the noise reduction packed layer (133) is arranged at intervals with bending ventilating duct (132), the bending ventilating duct
(132) inner port on the inside of noise control radiating tank wall (13) with being fixedly connected；The blower fan (131) passes through electric wire with temperature control device (3)
Connection.
2. a kind of three-phase high impedance high voltage silicon rectifier device according to claim 1, it is characterised in that：The noise reduction is filled out
Filling layer (133) includes sound-isolating sponge layer (1331) and asbestos stratum reticulare (1332), the sound-isolating sponge layer (1331) and asbestos stratum reticulare
(1332) it is fixedly connected.
3. a kind of three-phase high impedance high voltage silicon rectifier device according to claim 2, it is characterised in that：The bending is logical
The hollow bending ventilating duct that raised lines is carried for inwall in air channel (132).
4. a kind of three-phase high impedance high voltage silicon rectifier device according to claim 1, it is characterised in that：The air inlet is done
Dry tank wall (14) includes filter screen mouthful (141), bending aeration-drying layer (142) and air intake noise reduction packed layer (143), the filter screen mouthful
(141) it is located at the external port of bending aeration-drying layer (142), the filter screen mouthful (141) and bending aeration-drying layer (142) activity
Connection, the bending aeration-drying layer (142) is fixedly connected with air intake noise reduction packed layer (143), the bending aeration-drying layer
(142) it is arranged at intervals with air intake noise reduction packed layer (143), inner port and the air inlet of the air intake noise reduction packed layer (143) are dried
The inwall of tank wall (14) is fixedly connected.
5. a kind of three-phase high impedance high voltage silicon rectifier device according to claim 4, it is characterised in that：The air intake disappears
Sound packed layer (143) includes sound-isolating sponge layer (1431) and asbestos stratum reticulare (1432), the sound-isolating sponge layer (1431) and asbestos
Stratum reticulare (1432) is fixedly connected.
6. a kind of three-phase high impedance high voltage silicon rectifier device according to claim 5, it is characterised in that：The bending is logical
Wind drying layer (142) is internally provided with drier (1421), and the drier (1421) is solid with bending aeration-drying layer (142)
Fixed connection.
7. a kind of three-phase high impedance high voltage silicon rectifier device according to claim 1, it is characterised in that：The temperature control dress
Putting (3) includes temperature-detecting device (31) and control device (32), and the temperature-detecting device (31) and control device (32) are logical
Cross electrical connection.
8. a kind of three-phase high impedance high voltage silicon rectifier device according to claim 7, it is characterised in that：The temperature inspection
It is infra-red thermometer to survey device (31).
9. a kind of three-phase high impedance high voltage silicon rectifier device according to claim 1, it is characterised in that：The ultrasonic wave
Insect drives device (4) and occurs oscillating circuit including power supply (41), wave frequency controller (42), wave frequency converter (43) and ultrasonic wave
(44), the wave frequency controller (42), wave frequency converter (43) and ultrasonic wave occur oscillating circuit (44) respectively with power supply (41)
Electrical connection, the wave frequency controller (42) and wave frequency converter (43) occur oscillating circuit (44) with ultrasonic wave and electrically connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610168472.7A CN105762677B (en) | 2016-03-23 | 2016-03-23 | A kind of three-phase high impedance high voltage silicon rectifier device |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN201610168472.7A CN105762677B (en) | 2016-03-23 | 2016-03-23 | A kind of three-phase high impedance high voltage silicon rectifier device |
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| CN105762677A CN105762677A (en) | 2016-07-13 |
| CN105762677B true CN105762677B (en) | 2017-08-01 |
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| CN201610168472.7A Active CN105762677B (en) | 2016-03-23 | 2016-03-23 | A kind of three-phase high impedance high voltage silicon rectifier device |
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| CN112467563B (en) * | 2020-11-19 | 2022-11-04 | 中海油能源发展装备技术有限公司 | Safe type block terminal |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87211354U (en) * | 1987-11-03 | 1988-08-24 | 余远芬 | Efficiency frequency modulated ultrasonic mosquito killer |
| CN2208326Y (en) * | 1994-10-11 | 1995-09-27 | 北京大千商贸公司 | Ultrasonic device for expelling mice and insects |
| CN203660372U (en) * | 2014-01-26 | 2014-06-18 | 国家电网公司 | Exhaust air and noise reducing structure of power grid switching station |
| CN204030364U (en) * | 2014-08-20 | 2014-12-17 | 夏雪飞 | A kind of box-type substation of the noise reduction that ventilates |
| CN104851577B (en) * | 2015-06-05 | 2017-10-13 | 国家电网公司 | Noise reducing apparatus for transformer |
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