CN86104117A - Frequency modulation type exhausting gas flow stabilizing device - Google Patents
Frequency modulation type exhausting gas flow stabilizing device Download PDFInfo
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- CN86104117A CN86104117A CN 86104117 CN86104117A CN86104117A CN 86104117 A CN86104117 A CN 86104117A CN 86104117 CN86104117 CN 86104117 CN 86104117 A CN86104117 A CN 86104117A CN 86104117 A CN86104117 A CN 86104117A
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- frequency modulation
- gas flow
- pipe
- stabilizing device
- modulation type
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- Pipe Accessories (AREA)
Abstract
The present invention is a kind of frequency modulation type exhausting gas flow stabilizing device.The silencer for gas flow or the venting gas appliance that belong to general machine or motor.This device is made up of outer tube, interior pipe, convergent-divergent pipe, frequency modulation conduit, transmission part.Size by the frequency modulation conduit is adjusted the length difference of central passage and helical duct and changed interference frequencies reaches best interference effect, and the use of connect with the convergent-divergent pipe, the raising steady flow result.Frequency modulation type exhausting gas flow stabilizing device is to be motor, in particular for the usefulness of positive displacement compressor outfit.
Description
The present invention relates to a kind of frequency modulation type exhausting gas flow stabilizing device, it belongs to the silencer for gas flow or the venting gas appliance of general machine or motor.
Russian Patent SU730999, Deutsches Reichs-Patent DE2946036, U.S. Pat 4303143, B. P. GB2055959 etc., reported the venting gas appliance that adopts spirality channel, be mainly used in smoke evacuation is produced purification and cooling action, certain noise reduction is arranged, but do not consider the interference effect of noise.
The Japan Patent spy opens clear 57-191409, shown screw type baffler, its interference frequencies is non-adjustable, be difficult to satisfy and revise because on-the-spot delivery temperature, working medium constant change that the wave length of sound that causes changes and operating conditions changes the interference frequencies variation that the change of the frequency of okperation that causes requires, often make interference inefficacy or interference effect relatively poor, can't guarantee the requirement of interfering fully.
The invention provides a kind of motor that can be, in particular for positive displacement compressor, be equipped with a kind of steady air flow pressure, obviously reducing has the constant-current stabilizer of transferring noise and fluctuation pressure, i.e. frequency modulation type exhausting gas flow stabilizing device.
Task of the present invention is finished by following measures.
The double layer construction pipe that this device is made of: outer tube (5), interior pipe (4), between interior pipe (4) and outer tube (5), helical baffle (7) is set, and in the interior pipe (4), a frequency modulation conduit (3) that can move along interior pipe (4) tube wall is arranged, and on the tube wall of interior pipe (4) outlet section, have some apertures (2) and form.
Behind air-flow one inletting device, just shunt two-way, the one tunnel through central passage, its approach is shorter, and another road is through helical duct, and its approach is longer, when outlet is met, when if the length of central passage and helical duct differs 1/2 wavelength that equals certain frequency air-flow ripple, the pulsating pressure waves of this frequency then is when two passages, will phase shift 180 spend, it is anti-phase to reach both waveforms, behind the superposition, will interfere and eliminates its fluctuation pressure.
Frequency modulation conduit (3) moves in interior pipe (4), and pipe (4) is gone up the high and low position difference of aperture (2) in hiding, and just changes the length difference of central passage and helical duct, thereby changes interference frequencies, reaches the purpose of adjustable interference frequencies.
If at the inducer of this constant-current stabilizer, a convergent-divergent pipe (6) on the combine and assemble is when the outlet of air communication overcompression machine, be introduced into convergent-divergent pipe (6), pulse pneumatic is because the convergent-divergent of convergent-divergent pipe (6) obtains current stabilization at this first, therefore, the better effects if of current stabilization noise elimination.
Frequency modulation type exhausting gas flow stabilizing device of the present invention, it has following advantage compared with the prior art:
1. compact structure, simple can reduce because of interfering significantly to the fluctuation pressure of accent or noise are arranged, and current stabilization is eliminated the noise effective.
2. be with the frequency modulation type exhausting gas flow stabilizing device of convergent-divergent pipe, steady flow result is better.
3. adjustable continuously arbitrarily to interference frequencies, can satisfy the scene requirement that caused interference frequencies changes because of operating conditions changes, can guarantee to interfere fully.
4. frequency adjustment range is wide, the machinery of the applicable different main frequencies of device of a specification.
Accompanying drawing of the present invention is the frequency modulation type exhausting gas flow stabilizing device longitudinal section, and the numbering of each component is described as follows among the figure:
(1)-operating handle, (2)-aperture (3)-frequency modulation conduit,
(4)-Nei pipe, (5)-outer tube, (6)-convergent-divergent pipe
(7)-helical baffle, (8) circular hole, (9)-support,
(10)-screw, (11)-support, (12)-screw mandrel,
(13)-umbrella gear, (14)-handle, (15)-umbrella gear.
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail:
Frequency modulation type exhausting gas flow stabilizing device by: outer tube (5), interior pipe (4), convergent-divergent pipe (6), frequency modulation conduit (3), transmission part are formed.
Convergent-divergent pipe (6) is contained in the inner chamber of outer tube (5) inducer.When air-flow from compressor outlet, by the convergent-divergent pipe (6) on the frequency modulation type exhausting gas flow stabilizing device, pulse pneumatic obtains current stabilization at this first through convergent-divergent.
Interior pipe (4) is that straight pipe, its intracavity space are the passage of pulse pneumatic, i.e. central passage.On the tube wall of interior pipe (4) outlet section, have some apertures (2), for adjusting the usefulness that pulse pneumatic begins interference position.In the pipe (4) perforation length BC(on the outlet section tube wall promptly by the B point to the C point.The B point is positioned on the horizontal line of the upper end first row's aperture (2) on pipe (4) perforated section.The C point is positioned on pipe (4) the outlet end end face horizontal line) length decided by the tuning range requirement by helical duct.The length of frequency modulation conduit (3) must be greater than the length of BC.The A point is positioned on pipe (4) the entrance point end face horizontal line, and it is the basic point of airflow diversion to central passage and synchronous pressure wave of helical duct or acoustic pressure wave.Helical baffle (7), be fixed between interior pipe (4) and the outer tube (5) on, play the effect that connects both, simultaneously, form helical duct again.
Frequency modulation conduit (3) is straight pipe, on its two ends end face, respectively adorns a support (9) and (11), and a circular hole (8) is arranged on support (9), and a screw (10) is arranged on the support (11).Screw (10) and screw mandrel (12) engagement.And circular hole (8) is made the usefulness of screw mandrel (12) positioning and guiding.Be contained in the umbrella gear (13) and umbrella gear (15) engagement that is contained on the operating handle (1) of screw mandrel (12) end.Operating handle (1), the tube wall that passes outer tube (5) links to each other with handle (14).When shaking handle (14), screw mandrel (12) rotates, frequency modulation conduit (3) is moved up and down in interior pipe (4), because frequency modulation conduit (3) hides the position of aperture (2) height is arranged, difference with regard to can regulate airflow passes central passage and helical duct length, thereby the change interference frequencies reaches the purpose of adjustable interference frequencies.
The using method of frequency modulation type exhausting gas flow stabilizing device:
After pulse pneumatic enters convergent-divergent pipe (6), obtain current stabilization first at this, pulse pneumatic is through the A point then, shunting enters central passage and helical duct, join at the B point, because of different transfer routes, the air-flow that two passages are come becomes same frequency, antiphase, equicohesive pressure wave superposition, because of interference is offset.The gas pressure or the noise of accent are arranged like this, just be eliminated in the constant-current stabilizer outlet port.Interference frequencies can be provided by following formula:
f＝C/λ
n＝2n-1/2×C/△L
In the formula: the f-interference frequencies
C-is by the local velocity of sound of gas.
λ
n-wave length of sound.
The length difference of the propagation path of △ L-central passage and helical duct.
When shaking handle (14), operating handle (1) rotation, drive screw mandrels (12) rotation through umbrella gear (15) and (13), thus make frequency modulation conduit (3) on the inner chamber tube wall of interior pipe (4) outlet section, move up and down, to reach the purpose of regulating interference frequencies.
Claims (2)
1, the double layer construction pipe that constitutes by: outer tube, interior pipe of a kind of frequency modulation type exhausting gas flow stabilizing device, between interior pipe and outer tube, helical baffle is set, it is characterized in that in interior pipe [4], having a frequency modulation conduit [3] that can move and on the tube wall of interior pipe [4] outlet section, have some apertures [2] along the tube wall of interior pipe [4].
2, frequency modulation type exhausting gas flow stabilizing device according to claim 1 is characterized in that being provided with a convergent-divergent pipe (6) at its inducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86104117A CN86104117B (en) | 1986-11-27 | 1986-11-27 | Frequency modulation type exhausting gas flow stabilizing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86104117A CN86104117B (en) | 1986-11-27 | 1986-11-27 | Frequency modulation type exhausting gas flow stabilizing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86104117A true CN86104117A (en) | 1988-03-16 |
| CN86104117B CN86104117B (en) | 1988-04-27 |
Family
ID=4802343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN86104117A Expired CN86104117B (en) | 1986-11-27 | 1986-11-27 | Frequency modulation type exhausting gas flow stabilizing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86104117B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008014659A1 (en) * | 2006-07-25 | 2008-02-07 | Gree Electric Appliances Inc. Of Zhuhai | A pulse muffler for an air conditioner |
| CN102828809A (en) * | 2012-09-28 | 2012-12-19 | 长城汽车股份有限公司 | Automotive tailpipe with variable pipe diameter |
| CN103032132A (en) * | 2011-10-06 | 2013-04-10 | 川崎重工业株式会社 | Exhaust muffler |
| CN107246306A (en) * | 2017-08-09 | 2017-10-13 | 安徽江淮汽车集团股份有限公司 | A kind of muffler ASSY |
| CN110439653B (en) * | 2019-08-26 | 2021-04-20 | 南京工程学院 | Double-frequency adjustable Helmholtz noise elimination cavity of vehicle engine |
-
1986
- 1986-11-27 CN CN86104117A patent/CN86104117B/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008014659A1 (en) * | 2006-07-25 | 2008-02-07 | Gree Electric Appliances Inc. Of Zhuhai | A pulse muffler for an air conditioner |
| CN103032132A (en) * | 2011-10-06 | 2013-04-10 | 川崎重工业株式会社 | Exhaust muffler |
| CN103032132B (en) * | 2011-10-06 | 2015-06-10 | 川崎重工业株式会社 | Exhaust muffler and vehicle with same |
| CN102828809A (en) * | 2012-09-28 | 2012-12-19 | 长城汽车股份有限公司 | Automotive tailpipe with variable pipe diameter |
| CN102828809B (en) * | 2012-09-28 | 2014-09-03 | 长城汽车股份有限公司 | Automotive tailpipe with variable pipe diameter |
| CN107246306A (en) * | 2017-08-09 | 2017-10-13 | 安徽江淮汽车集团股份有限公司 | A kind of muffler ASSY |
| CN110439653B (en) * | 2019-08-26 | 2021-04-20 | 南京工程学院 | Double-frequency adjustable Helmholtz noise elimination cavity of vehicle engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN86104117B (en) | 1988-04-27 |
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