CN201090269Y - Diaphragm type gap type silencer - Google Patents
Diaphragm type gap type silencer Download PDFInfo
- Publication number
- CN201090269Y CN201090269Y CNU200720191554XU CN200720191554U CN201090269Y CN 201090269 Y CN201090269 Y CN 201090269Y CN U200720191554X U CNU200720191554X U CN U200720191554XU CN 200720191554 U CN200720191554 U CN 200720191554U CN 201090269 Y CN201090269 Y CN 201090269Y
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- Prior art keywords
- diaphragm
- air
- pressing plate
- joint
- cutting
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- Expired - Fee Related
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Abstract
The utility model relates to a diaphragm gap-type muffler which shapes as a cylinder. A flange is arranged at the cylinder end; an elastic diaphragm (2) is arranged at the air-current outlet end of a cylinder body (1); a cross-shaped or star-shaped kerf (22) is arranged in the middle of the diaphragm (2); the turnover size is automatically adjusted by the kerf according to the strength of air current; the diaphragm is clamped between the port of the cylinder body (1) and a pressing plate (3); an air-current outlet is arranged at the center of the pressing plate (3); the cross-shaped or star-shaped kerf (22) of the diaphragm is positioned within the range of the air-current outlet of the pressing plate. The utility model can achieve good muffling effect to the frequency band no more than 1000 Hz and can muffle the frequency band more than 1000 Hz to certain extent with the muffling amount over 30 dB (A); the utility model is simple in structure, small in size and low in air-current resistance.
Description
Technical field
The utility model relates to a kind of slot type silencing apparatus, especially the employed silencing apparatus of pump class.
Background technique
The exhaust sound maximum can reach 110～135dB (A) when screw vacuum pump, ventilation type Roots pump and multi-stage roots vacuum pump moved under the ultimate pressure operating mode, and along with the rising of inlet pressure, noise will descend gradually.The noise of said pump belongs to broadband noise, in basic, normal, high each frequency range big noise is arranged all, and its maximum noise peak value appears at low, intermediate frequency.Normally used complex muffler is unsatisfactory to the noise elimination effect of said pump, only at high band bigger sound deadening capacity is arranged, but to noise elimination DeGrain low, Mid Frequency, and gas-flow resistance is big, and volume is also big.
In low, Mid Frequency noise elimination effect spreading type silencing apparatus and resonator muffler are arranged preferably, but their acoustic characteristics is stronger to frequency selectivity, promptly only in a certain narrower frequency range of low frequency or intermediate frequency the effect of eliminating the noise is preferably arranged, other frequency range then there is not effect.Want many joints to connect to broadband noise low, Mid Frequency is essential, the complex structure that is bound to, volume increase.Micropunch plate muffler has resistance and resistive characteristics concurrently, the noise elimination frequency band broad, and gas-flow resistance is little, but because of perforated plate thickness can not excite regenerated noise easily greater than 1mm, the aperture of aperture can not be greater than 1mm in addition, stop up easily, so be not suitable on vacuum pump, using.
The model utility content
The purpose of this utility model provides a kind of diaphragm type slot type silencing apparatus that is specially adapted to use on the vacuum pump, on low, Mid Frequency good noise elimination effect is arranged all.
The technological scheme that its technical problem that solves the utility model adopts is: a kind of diaphragm type slot type silencing apparatus, be tubular, the tube end is equipped with flange, it is characterized in that: diaphragm arrangement is in the airflow outlet end of cylindrical shell, have cross or Mi Zixing joint-cutting in the middle of the diaphragm, joint-cutting is subjected to the effect of air-flow size to regulate the turned welt size automatically.
Described diaphragm is sandwiched between barrel port and the pressing plate, and the pressing plate center has flow outlet, and the cross of diaphragm or Mi Zixing joint-cutting are positioned at the flow outlet scope of pressing plate, and the root of each joint-cutting has position-arresting hole.
Described diaphragm is the flexible sheet of being made by laminated rubber therebetween cloth,
The utility model is by brand-new noise elimination theory---and " slit noise elimination " designs, and its principle is: the joint-cutting closure of diaphragm during airless, the joint-cutting of diaphragm produced the slit and outwards opens when air-flow was arranged, and the turned welt gap size is relevant with air pressure.When acoustic wave propagation during to cross or Mi Zixing otch turned welt slit, owing to the sudden contraction of air-flow path cross section produces the stationary point, some reflects to Sounnd source direction in sudden change place to make the noise of propagation, some acoustic energy is converted into heat energy in the violent friction of place, slit generation and makes acoustic energy depletion, thereby reaches the purpose of noise elimination.
The beneficial effects of the utility model are, the frequency of noise elimination wide ranges, can good noise elimination effect all be arranged to 1000Hz and all following frequency ranges, high band more than the 1000Hz also there is certain sound deadening capacity, the noise elimination diaphragm adopts folder cloth flexible membrane, be subjected to the effect of air-flow size can regulate the turned welt size automatically, total sound deadening capacity more than 30dB (A), and simple in structure, volume is little, gas-flow resistance is little.
Description of drawings
Fig. 1 is a sectional structure chart of the present utility model.
Fig. 2 is the right elevation of Fig. 1.
Among the figure: 1, cylindrical shell, 2, the noise elimination diaphragm, 21, position-arresting hole, 22, joint-cutting, 3, pressing plate, 4, bolt, 5, flange.
Embodiment
In conjunction with the accompanying drawings and embodiments the utility model is further specified.
A kind of diaphragm type slot type silencing apparatus is tubular, and the tube end is equipped with flange 5, and diaphragm 2 is arranged at simplified 1 airflow outlet end.Diaphragm 2 is flexible sheets of being made by laminated rubber therebetween cloth, has cross or Mi Zixing joint-cutting 22 in the middle of it, and joint-cutting 22 is subjected to the gas shock meeting outwards to open the formation air outlet, and the turned welt gap size is regulated automatically by gas shock power size.Diaphragm 2 is sandwiched between cylindrical shell 1 port and the pressing plate 3, pressing plate 3 centers have flow outlet, the cross of diaphragm or Mi Zixing joint-cutting 22 are positioned at the flow outlet scope of pressing plate, and the root of each joint-cutting has position-arresting hole 21, and joint-cutting continues cracking when avoiding turned welt excessive.Because the elastic reaction of rubber, turned welt can restore voluntarily.During assembling noise elimination diaphragm 2 usefulness pressing plates 3 and bolt 4 are fixed on the right side flange of silencer cylinder 1.
The utility model silencing apparatus is specially adapted to screw vacuum pump, ventilation type Roots pump and multi-stage roots vacuum pump and makes exhausting silencer usefulness, noise maximum when said pump is moved under the ultimate pressure operating mode, it is minimum that this moment, pump was discharged gas, air-flow (direction as shown in Figure 1) makes the cross of noise elimination diaphragm 2 or Mi Zixing joint-cutting produce the slit of turning up after entering silencing apparatus, violent friction takes place and be converted into heat energy and make acoustic energy depletion, noise low, Mid Frequency all has decay significantly, so the noise elimination effect is remarkable.
It all is can be self-regulating with the air-flow size that the cross of silencing apparatus or Mi Zixing joint-cutting produce the slit (aperture) of turning up, so the gas-flow resistance loss seldom.If two the utility model silencing apparatus series connection are used, the noise elimination effect is better.
Claims (3)
1. diaphragm type slot type silencing apparatus, be tubular, the tube end is equipped with flange (1), and it is characterized in that: diaphragm arrangement is in the airflow outlet end of cylindrical shell (1), have cross or Mi Zixing joint-cutting (22) in the middle of the diaphragm (2), joint-cutting is subjected to the effect of air-flow size to regulate the turned welt size automatically.
2. diaphragm type slot type silencing apparatus according to claim 1, it is characterized in that: diaphragm is sandwiched between cylindrical shell (1) port and the pressing plate (3), pressing plate (3) center has flow outlet, the cross of diaphragm or Mi Zixing joint-cutting (22) are positioned at the flow outlet scope of pressing plate, and the root of each joint-cutting has position-arresting hole (21).
3. diaphragm type slot type silencing apparatus according to claim 1 is characterized in that: diaphragm (2) is the flexible sheet of being made by laminated rubber therebetween cloth,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720191554XU CN201090269Y (en) | 2007-11-06 | 2007-11-06 | Diaphragm type gap type silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720191554XU CN201090269Y (en) | 2007-11-06 | 2007-11-06 | Diaphragm type gap type silencer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201090269Y true CN201090269Y (en) | 2008-07-23 |
Family
ID=39862029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720191554XU Expired - Fee Related CN201090269Y (en) | 2007-11-06 | 2007-11-06 | Diaphragm type gap type silencer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201090269Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102913355A (en) * | 2012-11-02 | 2013-02-06 | 重庆大学 | Single-cavity multi-resonant-frequency lateral-support resonant muffler |
| CN105222980A (en) * | 2015-11-12 | 2016-01-06 | 浙江真空设备集团有限公司 | A kind of wind tunnel body pumped vacuum systems |
| CN108394424A (en) * | 2018-05-17 | 2018-08-14 | 无锡市万里实业发展有限公司 | Rotatable feces collecting system in a kind of train |
| CN108442484A (en) * | 2018-05-17 | 2018-08-24 | 无锡市万里实业发展有限公司 | Rotatable feces collecting system and its noise reduction method in muffler, train |
| CN111560811A (en) * | 2020-05-20 | 2020-08-21 | 黄淮学院 | Sponge city brick that permeates water |
-
2007
- 2007-11-06 CN CNU200720191554XU patent/CN201090269Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102913355A (en) * | 2012-11-02 | 2013-02-06 | 重庆大学 | Single-cavity multi-resonant-frequency lateral-support resonant muffler |
| CN105222980A (en) * | 2015-11-12 | 2016-01-06 | 浙江真空设备集团有限公司 | A kind of wind tunnel body pumped vacuum systems |
| CN108394424A (en) * | 2018-05-17 | 2018-08-14 | 无锡市万里实业发展有限公司 | Rotatable feces collecting system in a kind of train |
| CN108442484A (en) * | 2018-05-17 | 2018-08-24 | 无锡市万里实业发展有限公司 | Rotatable feces collecting system and its noise reduction method in muffler, train |
| CN111560811A (en) * | 2020-05-20 | 2020-08-21 | 黄淮学院 | Sponge city brick that permeates water |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |