CN106783167B - A kind of power capacitor with denoising device - Google Patents
A kind of power capacitor with denoising device Download PDFInfo
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- CN106783167B CN106783167B CN201611218360.4A CN201611218360A CN106783167B CN 106783167 B CN106783167 B CN 106783167B CN 201611218360 A CN201611218360 A CN 201611218360A CN 106783167 B CN106783167 B CN 106783167B
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- capacitor
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- damping material
- metal shell
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- 239000003990 capacitor Substances 0.000 title claims abstract description 75
- 238000013016 damping Methods 0.000 claims abstract description 73
- 239000000463 material Substances 0.000 claims abstract description 50
- 239000002184 metal Substances 0.000 claims abstract description 27
- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 238000010521 absorption reaction Methods 0.000 claims abstract description 9
- 238000006073 displacement reaction Methods 0.000 claims description 17
- 239000011358 absorbing material Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 239000013013 elastic material Substances 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 4
- 230000017525 heat dissipation Effects 0.000 abstract description 3
- 230000005855 radiation Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/224—Housing; Encapsulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/35—Feed-through capacitors or anti-noise capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The present invention provides a kind of power capacitors with denoising device, metal shell cover and capacitor casing are tightly connected, damping material is filled in metal shell cover, high density granular and/or bubble are filled in damping material, the variation of the equivalent elastic coefficient k and Equivalent damping coefficient C of the quality m and density and damping material of adjusting high density granular, the frequency of denoising device is controlled, with the main noise of absorption capacitor；The present invention is greatly lowered than conventional capacitor noise radiation amount, and the installation cost is low, simple process, it is readily produced and manufactures, it influences minimum on the heat dissipation of power capacitor and does not influence its stability, it can be under the premise of guaranteeing power capacitor safe operation, noise is reduced, and facilitates installation and repairing.
Description
【Technical field】
The present invention relates to power capacitor field, in particular to a kind of power capacitor with denoising device.
【Background technique】
As super-pressure, extra-high voltage direct-current transmission engineering are more and more, exist in super-pressure, extra-high voltage DC transmission system
In AC and DC conversion process, a large amount of harmonic waves are generated.Harmonic current in parallel, filter condenser and DC filter capacitor by exchange
When device, medium receives the effect of alternating electric field power and generates vibration in capacitor unit, and capacitor unit case surface is caused to be vibrated,
Air close to capacitor unit case surface vibrates generation sound therewith.And in super-pressure, extra-high voltage electric power system, it is this kind of
In parallel, filter capacitor device has the characteristics that capacity is big, take up a large area and pylon is high, under certain condition, all capacitors
It is up to the audible noise greater than 60dB after the noise synthesis of device unit, has an adverse effect to production, the life of surrounding resident.
Currently, the reduction noise scenarios of power capacitor are largely in internal noise reduction, this noise reduction effect is not very bright
It is aobvious, and difficulty is brought to production and maintenance.
【Summary of the invention】
The present invention provides a kind of power capacitor with denoising device, can guarantee power capacitor safe operation
Under the premise of, noise is reduced, and facilitate installation and repairing.
In order to achieve the above objectives, the present invention uses following technical scheme：
A kind of power capacitor with denoising device, including capacitor casing and the gold for being mounted on capacitor casing bottom
Belong to jacket, metal shell cover and capacitor casing are tightly connected, and damping material are filled in metal shell cover, damping material is
Elastic material and wherein be filled with high density granular and/or bubble, adjust high density granular quality m and density and damping material
The variation of the equivalent elastic coefficient k and Equivalent damping coefficient C of material, control the frequency of denoising device, with the main of absorption capacitor
Noise.
Further, the shake of the quality m of high density granular, damping material equivalent elastic coefficient k and Equivalent damping coefficient C composition
Dynamic system, meets following relationship：
Wherein：K is the equivalent elastic coefficient of damping material, and C is the Equivalent damping coefficient of damping material, and m is high density
The equivalent mass of grain, k1、C1And m1The respectively equivalent stiffness of capacitor case vibration plane, Equivalent damping coefficient and equivalent
Quality；
In formula,
For the second dervative of damping system vibration displacement
For the first derivative of damping system vibration displacement
X is damping system vibration displacement
F is vibration force
For the second dervative of case vibration displacement
For the first derivative of case vibration displacement
x1For case vibration displacement
By adjusting the equivalent mass m of the high density granular and equivalent elastic coefficient k of damping material, reduce capacitor case
Vibration, by vibrational energy consumption in damping C.
Further, it is formed with cavity between the metal shell cover and damping material, sound-absorbing substance is installed in the cavities
Or damping material is pasted in metal shell cover bottom inside.
Further, the high density granular quality is 0.1g~100g.
Further, damping material has out-of-flatness surface.
Further, the metal shell cover inner surface is coated with sound-absorbing material.
Further, metal shell cover and capacitor casing junction are provided with sealing rubber pad.
The power capacitor that the present invention has denoising device includes capacitor casing and is sealingly mounted at capacitor casing bottom
Metal shell cover, metal shell cover and capacitor casing are tightly connected, damping material are filled in metal shell cover, damps material
It is filled with high density granular and/or bubble in material, adjusts the quality m of high density granular and the Equivalent Elasticity of density and damping material
The variation of coefficient k and Equivalent damping coefficient C controls the frequency of denoising device, with the main noise of absorption capacitor；Ratio of the present invention
Conventional capacitor noise radiation amount is greatly lowered, and the installation cost is low, simple process, is readily produced and manufactures, to electric power
The heat dissipation of capacitor influences minimum and does not influence its stability, can be under the premise of guaranteeing power capacitor safe operation, drop
Low noise, and facilitate installation and repairing.
Further, cavity is formed between metal shell cover and organic damping material, sound-absorbing material can be added more in sound-absorbing cavity
Effective absorption of noise can reduce the noise of power capacitor, and not influence the heat dissipation of power capacitor, and maintenance side
Just.
Further, organic damping material has not flat surface, can control frequency, the main frequency range of absorption capacitor
Sound.
【Detailed description of the invention】
Fig. 1 is the power capacitor structural schematic diagram with denoising device；
Fig. 2 is organic damping material schematic diagram, wherein (a) is full packing high density granular schematic diagram, it (b) is filling high density
Spend particle and bubble combination diagram；
Fig. 3 capacitor case vibration amplitude amplification factor curve graph；
The noise reduction system isoboles of Fig. 4 damping material and high density granular composition；
Fig. 5 show the equivalent model after considering case vibration；
Fig. 6 noise reduction effect figure；
In figure：Capacitor casing 1；Bubble 2；High density granular 3；Out-of-flatness surface 4；Cavity 5；Metal shell cover 6；Sealing
Rubber pad 7；Spring mass block 8.
【Specific embodiment】
Present invention is further described in detail in the following with reference to the drawings and specific embodiments, but not as to limit of the invention
It is fixed.
Shown in referring to Fig.1, the power capacitor of denoising device of the present invention installs one kind in 1 bottom of power capacitor casing
Shielding device for audio, the setting position consist of two parts, i.e. damping material and metal shell cover 6.It is referring to Fig. 2, Fig. 2 (a)
Full packing high density granular schematic diagram；Fig. 2 (b) is filling high density degree particle and bubble combination diagram；It is filled in damping material
High density granular 3 or bubble 2 or both have；Cavity 5 is formed between damping material and metal shell cover, cavity can be equipped with
Sound-absorbing substance or cavity 5 is inner can fill damping material, and 6 inner surface of metal shell cover can smear sound-absorbing material, and by its
Fixed current potential 8 is sealed with capacitor casing, is conducive to the noise that better absorption capacitor generates in this way.
3 mass of high density granular adjusts the quality and density and organic damping of high density granular between 0.1g~100g
The variation of the elasticity modulus k and damped coefficient c of material, control the frequency of denoising device, to adapt to the main noise frequency of capacitor
The absorption of rate.
The present invention is further improved and feature is：
Contain high density granular or bubble in organic damping material, or both have；
Organic damping material has not flat surface 4, can control frequency, the main frequency range sound of absorption capacitor；
The fixed current potential of the metal shell cover and capacitor casing are tightly connected；
High density granular can adjust the elasticity of its quality and density and the organic damping material of adjustment according to condenser current
Modulus k and damped coefficient C reach better noise reduction effect；
Described smears sound-absorbing material in metal shell cover inner surface.
Noise reduction basic principle：
Capacitor noise is vibrated by capacitor case to be generated, and case vibration occurs mainly in top and bottom.The present invention is only
Only illustrate that, in bottom installation situation, top installation is similar with bottom installation.
Capacitor noise is that frequency is limited Frequency point.Under normal conditions, the frequency for playing main function is 2~4
Frequency point.
Such as single tuned filter, major harmonic is the tuned frequency f0 of filter branch, then corresponding frequency noise can
To be calculated using formula (1)：
Fsound=f0 ± 50 (1)
If capacitor is double tunning branch f0, the main frequency point of f1, noise can be counted using formula (2) and formula (3)
It calculates：
Fsound1=f0 ± 50 (2),
Fsound2=f1 ± 50 (3)
Although remaining component is in the presence of these components are not most important frequency noises.Capacitor noise treatment it is good this
Several main components reach preferable noise reduction effect.
It is formed as shown in Figure 1, noise reduction result is divided into 8 parts.
Vibration main frequency can be calculated according to different capacitor application situations using formula (1)~formula (3).Then
Choose one or two main component.
The effect of bubble 2 mainly increases the catadioptric of sound wave transmitting in damping material, increases acoustic attenuation.
The high density granular 3 and damping material added in damping material forms 8 system of spring mass block, for absorbing spy
Determine the vibration of frequency.
Damping material surface carries out roughening treatment, is out-of-flatness surface, i.e., surface is arranged rough surface and increases folding
Reflective surface area.Further consume noise energy.
For filling sound-absorbing material inside cavity 5.
Metal shell cover 6 is used for the anti-water segregation of internal material, and plays deadening.Inner surface of outer cover can brush
Or it pastes damping paint or attracts blanket.
Sealing rubber pad 7 seals for internal material and avoids metal shell cover 6 and the direct rigid contact of capacitor case.
Damping material and internal high density granular form 8 system of spring mass block, for eliminating the vibration of internal specific frequency
It is dynamic.
As shown in figure 4, the noise reduction system isoboles of spring mass block 8.Wherein k is the Equivalent Elasticity system of item damping material
Number, C are the Equivalent damping coefficient of damping material, and m is the equivalent mass of high density granular.By damping material and high density granular 3
The system of composition is mounted on capacitor vibration shell.
Fig. 5 show the equivalent model after considering case vibration.Wherein, mass centre is that the capacitor assumed a certain is not sent out
The fixation position of raw vibration；k1、C1And m1Respectively the equivalent stiffness of capacitor case vibration plane, Equivalent damping coefficient and
Equivalent quality.
When not having to increase composite damping system, capacitor case is equivalent to k1、C1And m1The main system of composition, system
Vibration equation meets formula (4).
In formula,
For the second dervative of damping system vibration displacement
For the first derivative of damping system vibration displacement
X is damping system vibration displacement
F is vibration force
After increasing composite damping system, k, C, m form dynamic absorber, and system equation is shown in formula (5)：
In formula：
For case vibration displacement second dervative,
For case vibration displacement first derivative,
x1It is displaced for case vibration,
F vibration force,
Formula (6) can be expressed as the vibration amplitude amplification factor of capacitor case
Wherein：μ is mass ratio, and γ is natural frequency ratio, and ξ is damping ratio, | A1| it is amplitude；XstCause for extraneous exciting force
Quiet deformation
Fig. 3 capacitor case vibration amplitude amplification factor curve graph
Capacitor case vibration can be reduced, by vibrational energy by the equivalent mass m and parameter k of high density granular
Consumption is in damping C.
Fig. 6 noise reduction effect figure, wherein：Five-pointed star is to increase noise reduction, and circle is baseline results, and noise reduction effect is obvious.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
A specific embodiment of the invention is only limitted to this, for those of ordinary skill in the art to which the present invention belongs, is not taking off
Under the premise of from present inventive concept, several simple deduction or replace can also be made, all shall be regarded as belonging to the present invention by institute
Claims of submission determine scope of patent protection.
Claims (6)
1. a kind of power capacitor with denoising device, it is characterised in that：Including capacitor casing (1) and it is mounted on capacitor
The metal shell cover (6) of shell (1) bottom, metal shell cover (6) and capacitor casing are tightly connected, in metal shell cover (6)
Filled with damping material, damping material is elastic material and is wherein filled with high density granular (3) and/or bubble (2), adjusts
The variation of the quality m and density of high density granular and the equivalent elastic coefficient k of damping material and Equivalent damping coefficient C, control drop
It makes an uproar the frequency of device, with the main noise of absorption capacitor；
Wherein, the vibration system of the quality m of high density granular, damping material equivalent elastic coefficient k and Equivalent damping coefficient C composition
System, meets following relationship：
Wherein：K is the equivalent elastic coefficient of damping material, and C is the Equivalent damping coefficient of damping material, and m is high density granular
Equivalent mass, k1、C1And m1The respectively equivalent stiffness of capacitor case vibration plane, Equivalent damping coefficient and equivalent mass；
In formula；For the second dervative of damping system vibration displacement,For the first derivative of damping system vibration displacement, x is damping
System vibration displacement, F is vibration force,For case vibration displacement second dervative,For case vibration displacement first derivative,
x1For case vibration displacement；
By adjusting the equivalent mass m of the high density granular and equivalent elastic coefficient k of damping material, reduce capacitor case vibration
It is dynamic, by vibrational energy consumption in damping C.
2. a kind of power capacitor with denoising device as described in claim 1, it is characterised in that：The metal shell cover
(6) it is formed with cavity (5) between damping material, sound-absorbing substance is installed in cavity (5) or in metal shell cover (6) bottom
Inside is pasted with damping material.
3. a kind of power capacitor with denoising device as claimed in claim 2, it is characterised in that：The high density granular
(3) quality is 0.1g~100g.
4. a kind of power capacitor with denoising device as claimed in claim 2, it is characterised in that：Damping material has not
Flat surface (4).
5. a kind of power capacitor with denoising device as claimed in claim 2, it is characterised in that：The metal shell cover
(6) inner surface is coated with sound-absorbing material.
6. a kind of power capacitor with denoising device as claimed in claim 2, it is characterised in that：Metal shell cover (6)
Capacitor casing junction is provided with sealing rubber pad (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611218360.4A CN106783167B (en) | 2016-12-26 | 2016-12-26 | A kind of power capacitor with denoising device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611218360.4A CN106783167B (en) | 2016-12-26 | 2016-12-26 | A kind of power capacitor with denoising device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106783167A CN106783167A (en) | 2017-05-31 |
| CN106783167B true CN106783167B (en) | 2018-11-16 |
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| CN201611218360.4A Active CN106783167B (en) | 2016-12-26 | 2016-12-26 | A kind of power capacitor with denoising device |
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| CN109671562B (en) * | 2018-12-11 | 2024-06-25 | 深圳市法拉第电驱动有限公司 | Noise reduction structure of bus capacitor, bus capacitor and electric automobile |
| CN110581020A (en) * | 2019-10-15 | 2019-12-17 | 西安交通大学 | Capacitor and method for determining rigidity of rigidity resonance element |
| CN112943832A (en) * | 2021-04-09 | 2021-06-11 | 厦门振为科技有限公司 | Low-noise capacitor |
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Effective date of registration: 20210730 Address after: No.10 Taoyuan Road, Lianhu District, Xi'an City, Shaanxi Province Patentee after: XI'AN XD POWER CAPACITOR Co.,Ltd. Patentee after: CHINA XD ELECTRIC Co.,Ltd. Address before: 710075 Shaanxi city of Xi'an province high tech Zone No. 7 Tang Xing Lu Patentee before: CHINA XD ELECTRIC Co.,Ltd. |