CN1368594A - Method and apparatus for reducing pressure of high-pressure fluid and attenuating pulse energy of fluid in channel - Google Patents
Method and apparatus for reducing pressure of high-pressure fluid and attenuating pulse energy of fluid in channel Download PDFInfo
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- CN1368594A CN1368594A CN 01102789 CN01102789A CN1368594A CN 1368594 A CN1368594 A CN 1368594A CN 01102789 CN01102789 CN 01102789 CN 01102789 A CN01102789 A CN 01102789A CN 1368594 A CN1368594 A CN 1368594A
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- air guide
- guide sleeve
- silencing apparatus
- runner
- symmetry plane
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
- F16L55/02709—Throttle passages in the form of perforated plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/083—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using transversal baffles defining a tortuous path for the gases or successively throttling gas flow
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention discloses a method, device and a few kinds of mufflers for reducing pressure of high-presusre fluid and damping kinetic energy of liquid pulsation. The invented method is to instally kuppe in fluid channel, making liquid which flows along a direction parallel to the central axis in channel, change flow direction and divide up liquid into multiple small branches. The multiple small branches with an angle between each other move alone two sides of longitudinal symmetrical plane in centripetal direction or in reverse direction, bump each other or bump on inner wall of outside and inside of kuppe at the next lower level.
Description
The present invention relates to a kind of method and corresponding device thereof thereof that in runner, makes high-pressure liquid step-down and dampening fluid pulse energy, and the silencing apparatus of making according to the structure of this device.
For a long time, the practical sound reduction method that silencing apparatus adopted installed for the displacement noise that reduces high pressure and pulsating fluid of people is as follows:
1) changes the flow direction of fluid repeatedly;
2) repeatedly make the section of fluid by shrinking and enlarging;
3) fluid is partitioned into a lot of little tributaries and mobile along rough plane;
4) high temperature, high-pressure liquid are cooled off in runner and expand;
5) porous material of packing in runner is to dissipate and to absorb pulse energy.
In addition, people attempt making the silencing apparatus of practicality according to intensity and ripple frequency can decay the each other when superimposed coherent waves principle of interference of pulse energy of the opposite multiply pulsating fluid of direction that equates pulse, made muffler volume is littler, flow resistance coefficient is lower in the hope of making, and obtains better acoustical absorptivity simultaneously.
Among U.S. Pat 05693918, US05619020, US05600106, US05541373 and Chinese patent application numbers 92217739 and 89210652, employing sensor internal-combustion engine rotational speed and exhaust pulses have all been related to, detected numerical value is transported to electronic control and amplifying device, send and the intensity of the exhaust of pulsing and the sound wave that frequency is identical, phase place is opposite with loudspeaker then, and make it to superpose with exhaust pulses, thereby the pulse energy that makes exhaust obtains decay, reaches the purpose that reduces engine exhaust noise.The major defect of this type of noise-reduction method is and need special loudspeaker chamber be set for loudspeaker, thereby the silencing apparatus that causes the type takes up room greatly, spatial arrangement is difficulty comparatively, and reliability is relatively poor when working under rugged environment, and needs the extra energy of consumption to realize noise elimination function.
In Chinese patent application numbers 93236371,93202078 and 85205813, all be pulse pneumatic is decomposed into two strands of air-flows and makes it to liquidate, described muffler configuration if be used for realize the pulsing multistage noise reduction of exhaust, the complex structure that then can cause silencing apparatus, cost rises, and is unfavorable for miniaturization and reduces exhaust back pressure.
In addition, a common shortcoming of above-mentioned all types of silencing apparatus is that they all are not suitable for the step-down discharging of High Temperature High Pressure continuous flow, are not suitable for the pulse energy of decay liquid yet.
The objective of the invention is on the basis of the mutual principle of interference of coherent waves, a kind of method that makes the practicality of high-pressure liquid step-down and dampening fluid pulse energy in runner is provided; For this reason, it is a kind of in order to realizing the device of this method that the present invention also provides, and the silencing apparatus of several configurations of making according to the essential structure of this device.
For the purpose of clear and definite, this specification is defined as follows:
1. central axis---in the track that thin-walled type air guide sleeve and each cross section are the runner section cross-section center point of plane symmetry figure is housed, be generally straight line, in this Figure of description with single-point line expression.
2. vertical symmetry plane---in the track of symmetry axis longshore current road longitudinal direction in this runner section that thin-walled type air guide sleeve and each cross section are the runner section cross section of plane symmetry figure is housed, be generally the plane.
3. geometric centre axes---each cross section is the track of the geometric thin-walled type air guide sleeve of plane symmetry cross-section center point, is generally straight line, represents with double dot dash line in this Figure of description.
But, when the central axis of the geometric centre axes of air guide sleeve and of living in section runner coincides, then unified with single-point line expression.
4. with the track of the equidistant point of air guide sleeve both sides sidewall, and different points is unequal usually to the distance of both sides sidewall in specific vertical symmetry plane---the thin-walled type air guide sleeve.
To achieve the above object of the invention, the method that the present invention adopts is to make the fluids that flow along how much central axis parallel directions in the runner, transition flow to be transformed into the multiply sprout; Make these how much central axis in multiply sprout and the runner or a specific vertical symmetry plane in the runner be a certain angle and simultaneously entad or simultaneously opposite direction ground towards two side flow of this specific vertical symmetry plane with directly clash into mutually, or strike the outer side surface of next stage air guide sleeve when simultaneously entad or simultaneously opposite direction ground is towards two side flow of this specific vertical symmetry plane, or at an angle and simultaneously to deviate from specific vertical symmetry plane simultaneously mobile and strike on the interior sidewall surface of next stage air guide sleeve or runner on centrifugal or opposite direction ground; And make the multiply sprout be zero or approach zero making a concerted effort perpendicular to the kinetic energy component on the cross section of these how much central axis in the runner or specific vertical symmetry plane.
In order to realize method of the present invention, the present invention adopts the device of packing one or more levels thin-walled type air guide sleeve into and constituting in a certain section runner that fluid is flowed through.In most cases, the end that is configured as of air guide sleeve entad seals, and the outer side surface of the other end is connected with the runner interior sidewall surface and seals, and its shape is the thin-walled member that is similar to guided missile or rocket nose section.The geometric centre axes of multilevel deflector cover and line stretcher thereof or specific vertical symmetry plane and extended surface thereof overlap, and the geometric centre axes of air guide sleeves at different levels or its specific vertical symmetry plane all coincide with the central axis or the corresponding vertically symmetry plane of of living in section runner usually; Be a certain angle and simultaneously centrifugal or deviate from simultaneously that specific vertical symmetry plane flows and the mode that strikes certain solid surface when coming the pulse energy of dampening fluid when employing makes multiply sprout and air guide sleeve geometric centre axes or specific vertical symmetry plane, the geometric centre axes of air guide sleeves at different levels or specific vertical symmetry plane can not overlap mutually with central axis or arbitrary vertical symmetry plane of of living in section runner.Perpendicular to the air guide sleeve cross section of geometric centre axes or specific vertical symmetry plane is the plane geometric figure of symmetry, for example circular, oval, oblateness or round rectangle, even can be ring or equilateral geometric figure.All have on each air guide sleeve wall and allow fluid flow to a plurality of openings of another side from a certain side of air guide sleeve wall, the preferred configuration of opening and the preferred arrangement on the air guide sleeve wall thereof are, the shape of each opening of same horizontally-arranged and size all equate, and the centre of form of this current drainage through hole all is positioned on the same air guide sleeve cross section wall perpendicular to geometric centre axes or specific vertical symmetry plane, and opening is vertically arranged symmetrically.The opening that adjacent air guide sleeve is positioned on the wall of mutually horizontal intussusception position is vertically evenly staggered symmetrically, the suitable distance of horizontal skew mutually.Total hole area of whole openings is whole or most on each air guide sleeve wall, all be positioned at by the air guide sleeve geometric centre axes or with the line stretcher of the perpendicular longitudinal profile air guide sleeve profile line straightway of the specific vertical symmetry plane of air guide sleeve or the tangent line of arc, with the geometric centre axes of air guide sleeve or specific vertical symmetry plane angle α≤| 45 ° | and on the air guide sleeve wall in the vertical angles scope, the optimum position that opening is placed be under above-mentioned definition angle α≤| 30 ° | and on the air guide sleeve wall in the vertical angles scope.
The present invention gives the silencing apparatus example that several employing said methods of making according to the configuration of said apparatus are eliminated the noise, and the thin-walled type air guide sleeve in the described silencing apparatus embodiment is to select different three-dimensional geometry configurations for use according to the different geometries of its runner of living in.
The silencing apparatus of making according to the essential structure of the device of the present invention a plurality of/multistage thin-walled type air guide sleeve that is easy in limited space, pack into, thus can realize the multistage step-down of high pressure continuous flow body and the multistage pulse energy decay of pulsating fluid; No matter what comprise in device of making and the silencing apparatus convection cell is that the low frequency or the pulse energy of high frequency can both be realized good decay; Need not consume the decay pulse energy of pulsating fluid of extra energy; The secondary noise that the housing vibration that the silencing apparatus of making can avoid existing silencing apparatus may cause because of the instantaneous non-equilibrium of inner transverse is stressed causes; The silencing apparatus of the type has bigger Applicable scope, both can be applicable to the step-down discharging of high pressure continuous flow, can be applied to the pulse energy decay of high-pressure pulsating air-flow, the pulse energy of the liquid that also can be applied to decay; Adopt the method for the invention to make the silencing apparatus of high-pressure liquid step-down and dampening fluid pulse energy, compare with existing silencing apparatus aspect several to adapt to putting position, volume size, flow resistance coefficient, acoustical absorptivity and cost performance etc. in the variation of its profile, obviously have the good comprehensive performances index.When silencing apparatus of the present invention is used as the exhaust silencer of reciprocating internal combustion engine, compare with the original exhaust silencer of internal-combustion engine, under all equal substantially condition of both profile, volume and exhaust back pressure, exhaust sound reduces by 3 to 7dB.In addition, adopt the inventive method to eliminate the noise and use internal-combustion engine catalyst purifying exhaust gas silencing apparatus that apparatus of the present invention configuration makes and also have the miniaturization of being easy to and can make the entire area of the catalyzer of its internal coat all be in efficiently advantages such as catalytic purification state.
Provide 4 embodiments in infinite mode below, and in conjunction with its accompanying drawing, method of the present invention, the silencing apparatus that installs and make are described in further detail.
Fig. 1 is the sectional arrangement drawing through the air guide sleeve geometric centre axes of cylindrical flow channel silencing apparatus.
Fig. 2, Fig. 3 and Fig. 4 are respectively A-A, B-B and three cross-sectional views of C-C of silencing apparatus shown in Figure 1.
Fig. 5 is the sectional arrangement drawing that passes through the short symmetry axis of flow channel cross-section of oblate cylindrical flow channel silencing apparatus.
Fig. 6 and Fig. 7 are the D-D and the E-E cross-sectional views of silencing apparatus shown in Figure 5.
Fig. 8 is the F-F sectional drawing of silencing apparatus shown in Figure 5, just passes through the sectional arrangement drawing of transversal face length symmetry axis of this silencing apparatus and the specific symmetry plane of air guide sleeve.
Fig. 9 is the sectional arrangement drawing through the air guide sleeve geometric centre axes of hole enlargement cylindrical flow channel silencing apparatus.
Figure 10 and Figure 11 are respectively the G-G and the H-H cross-sectional views of silencing apparatus shown in Figure 9.
Figure 12 is the sectional arrangement drawing through the air guide sleeve geometric centre axes that utilizes the I. C. engine exhaust catalytic purification silencing apparatus that thin-walled type air guide sleeve configuration makes.
Figure 13 and Figure 14 are respectively the I-I and the J-J cross-sectional views of catalytic purification silencing apparatus shown in Figure 12.
Fig. 1 is the sectional arrangement drawing of a kind of cylindrical flow channel silencing apparatus that the present invention relates to, and this cutting plane is through the geometric centre axes of built-in air guide sleeve.Silencing apparatus is by fluid intake channel 1, protecgulum 2, muffler shell 3, locating piece 4, first order air guide sleeve 5, second level air guide sleeve 6, third level air guide sleeve 7, component such as bonnet 8 and fluid discharge pipe 9 are formed, and have fluid circulating hole 5a, 5b, 6b and 7b on the air guide sleeve walls at different levels.At this, muffler shell inner side surface area surrounded is exactly one section runner that fluid is flowed through.The central axis of the geometric centre axes of air guide sleeves at different levels and this section runner coincides, referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.
In the following description, the upstream extremity that is referred to as silencing apparatus or its component to an end of fluid inflow will be met, the end that fluid is flowed out is called downstream, thereby the air guide sleeve that will meet at first to streaming flow is called first order air guide sleeve, thereafter be called second level air guide sleeve successively, third level air guide sleeve ..., the progression of the air guide sleeve that is provided with in each silencing apparatus depends primarily on desired sound deadening capacity and the overall balance between the two of flow resistance coefficient size.
In the present embodiment, all towards geometric centre axes sealing voluntarily centripetally, shape is the streamlined shell construction that is similar to guided missile or rocket nose section to the upstream extremity of thin-walled type air guide sleeves at different levels, to reduce the flow resistance of fluid.The mutual seal welding of the interior sidewall surface of the outer side surface of air guide sleeve downstream and muffler shell 3 is referring to Fig. 1.
As shown in Figure 1, the inside of silencing apparatus 3 is separated into expansion chamber interference chambers 12 11, the second, interference chambers 10, the first and the 3rd interference chamber 13 by thin-walled type air guide sleeve 5,6 and 7 from upstream extremity downstream end order successively.
Fluid enters in the silencing apparatus 3 through the fluid intake channel 1 of break-through protecgulum 2, and in expansion chamber 10, expand or slow down flow velocity, the 3 dimensional coil geometry of air guide sleeve then makes the direction of flow that flows along air guide sleeve geometric centre axes parallel direction in this section runner deflect, fluid passes opening 5a and the 5b on first order air guide sleeve 5 walls then, be transformed into the multiply sprout, and be a certain angle ground with geometric centre axes symmetrically and entad flow simultaneously.First order air guide sleeve 5 adopts a plurality of small apertures hole intensive symmetrically around the configuration of arranging along transversal circumferential surface near the opening 5a on the front half part cover walls of upstream extremity, and the sprout that passes through 5a is interfered first and entad directly clashed into mutually, expands in the chamber 11 or slow down flow velocity.
Because first order air guide sleeve 5 is near the latter half part of downstream and the laterally mutual intussusception of front half part of next stage air guide sleeve 6, fluid takes place directly pass through and cause reducing acoustical absorptivity for avoiding as far as possible or reducing, the sprout that promptly passes through 5b fails also to reflect on first interferes in the chamber 11 mutually oppositely around the shell wall that strikes second level air guide sleeve 6, refraction, sputter and mutual consumption pulse energy are to expand and to slow down flow velocity, but entering into second, the opening 6b that directly passed through air guide sleeve 6 interferes chamber 12, therefore the opening 5b on first order air guide sleeve 5 walls should vertically interlock around even symmetrically with the opening 6b on second level air guide sleeve 6 walls, and opening 5b and 6b all should adopt the hole of larger aperture, to guarantee to have the total hole area of enough big opening and to reduce the resistance that fluid passes through.In like manner, the hole 6b and the 7b that are opened on second level air guide sleeve 6 and the third level air guide sleeve 7 mutually horizontal intussusception position walls also adopt larger aperture, and vertically symmetrically around evenly staggered, shown in the B-B cross-sectional view of Fig. 3.For fear of or reduce fluid directly pass through effect, adjacent air guide sleeves at different levels are also should be on the lateral attitude interlaced and be offset suitable distance at the opening 5b, the 6b that laterally offer on the wall of intussusception position mutually and 7b, as shown in Figure 1.
The opening of fluid on passing through each grade air guide sleeve wall and when entering into next stage and interfering the chamber, all passing through opening on first order air guide sleeve 5 walls with fluid enters into first and interferes chamber 11 the same, all be partitioned into the multiply sprout once more, and then clash into, sputter, expand or slow down flow velocity, flow out silencing apparatuss until last through fluid discharge pipe 9.
From silencing apparatus shown in Figure 1 as seen, opening on the air guide sleeve walls at different levels all is opened in the line stretcher of the longitudinal section profile line straightway of making through the air guide sleeve geometric centre axes or the tangent line of arc, with the angle α of air guide sleeve central axis≤| 45 ° | on the air guide sleeve wall in the scope, also can be opened on the wall in the vertical angles scope of α.The optimum position of each opening be positioned at α≤| 30 ° | on the air guide sleeve wall of scope, obviously this angle is more little, and the radially kinetic energy component of sprout that flows through each opening is big more, and its axial kinetic energy component is then more little.Because each opening shape of same horizontally-arranged is identical on each air guide sleeve wall, equal and opposite in direction, the centre of form is positioned on the same cross section wall, and is vertically symmetrically and evenly around arrangement, thus can make the fluid of flowing through radially the kinetic energy component to make a concerted effort be zero.Under above-mentioned condition, the radially kinetic energy component of each bar sprout is big more, and the effect of noise elimination is good more.
In the present embodiment, can also select the discharge tube of silencing apparatus is transformed into water conservancy diversion bell-type fluid discharge pipe 9, Here it is with the sealing of the upstream extremity of common fluid discharge pipe, the part that discharge tube is positioned at silencing apparatus prolongs, and on the sidewall of pipe according to above-mentioned air guide sleeve wall on the method for perforate leave a plurality of hole 9c symmetrically, thereby increase many one-levels noise elimination function.The mutual alignment relation of opening is the same on mutual alignment relation between the opening 7b on opening 9c on fluid discharge pipe 9 walls and adjacent air guide sleeve 7 walls and two the adjacent air guide sleeve walls, with the effect of avoiding or reduce fluid of directly passing through as far as possible is criterion, referring to Fig. 1 and C-C cross-sectional view 4.
Locating piece 4 in the silencing apparatus 3 is used for the front end of first order air guide sleeve 5 is fixed, coincide with the geometric centre axes of guaranteeing air guide sleeve 5 and the central axis of silencing apparatus shell 3, avoid the front position skew of air guide sleeve and under the impact of high-pressure liquid, cause the sound of blowing a whistle.The front end of the locating piece 4 in this routine described silencing apparatus also is bent to form fixedly rotary blade, referring to Fig. 1 and A-A cross-sectional view 2, rotary blade pivots the fluid of flowing through, and helps making the fluid that flows on the shell face of 5b next door also can flow through 5b smoothly, thereby can reduce flow resistance.
Flow channel cross-section in silencing apparatus is the plane symmetry geometric figure of different shape, for example circular, oval, oblate, round rectangle or equilateral polygon, and the length ratio of orthogonal long and short two symmetry axis is less on this plane symmetry geometric figure, for example less than 1.8 o'clock; the cross-sectional profiles of thin-walled type air guide sleeve can be selected for use and the of living in section plane symmetry geometric figure that flow channel cross-section is identical, and flow channel cross-section and air guide sleeve cross section also can be selected the geometric combination of above-mentioned various plane symmetry each other for use.
Fig. 5 is the sectional arrangement drawing that cuts out through flow channel cross-section figure symmetry minor axis of second kind of silencing apparatus the present invention relates to, silencing apparatus is made up of fluid intake channel 1, protecgulum 2, muffler shell 3, first order air guide sleeve 5, second level air guide sleeve 6, third level air guide sleeve 7, bonnet 8 and two component such as fluid discharge pipe 9, has fluid circulating hole 5b, 6b and 7b on the air guide sleeve walls at different levels.The cross section of silencing apparatus 3 is oblate, also can be the figure that ellipse, round rectangle or other cross section have two mutual vertical axis of symmetry.Geometric long and short two symmetry axis of this plane symmetry are orthogonal and length ratio diaxon is bigger, for example greater than 2.
In the present embodiment, the upstream extremity of thin-walled type air guide sleeves at different levels all seals voluntarily towards specific vertical symmetry plane, and the outer side surface of downstream is connected with the interior sidewall surface of silencing apparatus 3 and seals.The air guide sleeve longitudinal section upstream extremity profile line that is parallel to the longitudinal plane of making by the short symmetry axis of cross section figure is streamlined, referring to Fig. 5.The shape of the configuration of whole air guide sleeve and thin-walled type arched door is similar.The longitudinal plane that forms by the long axis of symmetry in the cross section figure of suppressor case 3 is equal to the distance of air guide sleeve both sides sidewall, therefore along longitudinal section F-F while that this long axis of symmetry cuts out specific vertical symmetry plane of air guide sleeve just, referring to Fig. 5,6,7 and 8.The vertical symmetry plane that its transversal face length symmetry axis makes that passes through of the specific symmetry plane of air guide sleeves at different levels and silencing apparatus 3 overlaps in the present embodiment.The arched door open end of air guide sleeve both sides and the interior sidewall surface welded seal of silencing apparatus 3.
Fluid expands in intake channel 1 enters expansion chamber 10 and slows down flow velocity, pass the opening 5b on first order air guide sleeve 5 two side walls then, be transformed into the multiply sprout, and symmetrically with specific vertical symmetry plane F-F of air guide sleeve be a certain angle ground simultaneously opposite direction flow.The sprout that flows through air guide sleeve 5 both sides areole 5b oppositely meets on first specific vertical symmetry plane F-F position of interfering in the chamber 11, knock against each other, expand or slow down flow velocity, or oppositely strike mutually on the shell wall outer surface of second level air guide sleeve 6 also reflect, refraction, sputter, mutually consume pulse energy, expand or slow down flow velocity.Thereafter, fluid is entering into the process that second, third interferes the chamber, all repeats experience and is cut apart, clashes into mutually, expands or slow down flow velocity, just is discharged from silencing apparatus at last.
The opening shape of same horizontally-arranged is identical on each air guide sleeve two side walls, and equal and opposite in direction, the hole shape heart are positioned on the cover wall of same cross section, vertically arranges symmetrically.Opening position on the wall of the mutually horizontal intussusception position of adjacent air guide sleeve is vertically evenly staggered symmetrically, laterally be offset suitable distance mutually, referring to Fig. 5 and D-D cross-sectional view 6 and E-E cross-sectional view 7, and the F-F sectional arrangement drawing 8 that coincides with specific vertical symmetry plane.
This routine described silencing apparatus adopts two water conservancy diversion bell-type fluid discharge pipes 9, both can reduce flow resistance in order to increase total cross-section area of discharge tube, also can increase aesthetic feeling.
Because the front half part of the first order air guide sleeve 5 in the silencing apparatus 3 does not have and second level air guide sleeve 6 horizontal intussusceptions, so the opening on this position wall also can adopt the configuration of a plurality of small apertures hole vertical, horizontal symmetry dense arrangement.
The thin-walled arch door shape air guide sleeve of installing in this routine described silencing apparatus 3 also can adopt plane by the short symmetry axis of cross section as specific vertical symmetry plane, is about to Fig. 6 and air guide sleeve shown in Figure 7 and silencing apparatus shell 3 relative positions around geometirc symmetry axis line half-twist.
In addition, when flow channel cross-section is the plane geometric figure of Pigs Kidney shape or one section ring, intersect vertically with the longitudinal plane that forms by the short symmetry axis of this cross section and equate that with the flow path wall distance longitudinal surface that forms is a cambered surface, this vertical cambered surface can be made labyrinth thin-walled arch door shape air guide sleeve as specific vertical symmetry plane, to match with flow channel shape.
At runner is in the silencing apparatus of circular cross section, bigger when the diameter of silencing apparatus and its axial length, promptly the longitudinal length of silencing apparatus more in short-term, it is ring-shaped closed air guide sleeve configuration that the thin-walled type air guide sleeve of interior dress can adopt upstream extremity.The cross section of air guide sleeve is the ring that two concentric circles constitute, and its sectional arrangement drawing profile line by geometric centre axes is a bimodal shape, and summit is the upstream extremity of air guide sleeve.The 3D shape of this air guide sleeve and first embodiment's that will the present invention relates to the described air guide sleeve of Fig. 1 is from middle transversely truncation, to block the upstream extremity and the downstream of the air guide sleeve front half part that gets off again and exchange, the configuration that the alignment of the cutout of front and back two half air guide sleeves is welded mutually is similar then.Specific vertical symmetry plane of air guide sleeve equates that to the distance of both sides air guide sleeve wall this specific vertical symmetry plane is cylindrical shape or hole enlargement cylindrical shape, the lateral/radial kinetic energy component of each strand sprout specific vertical symmetry plane and near cancel out each other.At flow channel cross-section is the plane symmetry geometric figure of other shape, and the longitudinal length of silencing apparatus relatively more in short-term, and by parity of reasoning for the air guide sleeve shape of being inserted.
Fig. 9 is the sectional arrangement drawing through the air guide sleeve geometric centre axes of the third silencing apparatus that the present invention relates to, and Figure 10 and Figure 11 are respectively the G-G and the H-H cross-sectional views of this silencing apparatus.The major diameter ratio of runner is bigger.Silencing apparatus is made up of parts such as fluid intake channel 1, silencing apparatus shell 3, locating piece 4, first order air guide sleeve 5, second level air guide sleeve 6, bonnet 8 and fluid discharge pipes 9, has opening 5a and 6a on the two-stage air guide sleeve wall.
First order air guide sleeve 5 is conical thin-walled members, and second level air guide sleeve 6 is to be combined with thereafter hole enlargement cylindrical wall body and the thin-walled member that forms by the taper shape of upstream extremity.Can also increase the progression of built-in air guide sleeve when needing, so that noise is further reduced.The upstream extremity of air guide sleeves at different levels is sealing voluntarily entad, and the downstream outer side surface closely is connected with the interior sidewall surface of silencing apparatus shell 3, and the central axis of air guide sleeve geometric centre axes and silencing apparatus overlaps.
Because between first order air guide sleeve 5 and the second level air guide sleeve 6, the position that does not have laterally mutual intussusception, so the opening on air guide sleeve 5 walls all selects for use a plurality of small aperture hole 5a intensive symmetrically around the configuration of arranging, referring to Fig. 9 and Figure 10 along transversal circumferential surface.Basically all horizontal intussusception between second level air guide sleeve 6 and the fluid discharge pipe 9, yet silencing apparatus shown in Figure 9 still all adopts a plurality of small apertures hole intensive symmetrically around the configuration of arranging along transversal circumferential surface on air guide sleeve 6 and discharge tube 9 walls, this configuration can cause producing between the two and directly passes through effect, but has also reduced flow resistance coefficient simultaneously.
In the silencing apparatus shown in this example 3, the end, upstream of water conservancy diversion bell-type fluid discharge pipe 9 is not entad to seal voluntarily, but use discharge tube 9 upstream direction is extended, and the method that abuts to the upstream extremity interior sidewall surface of second level air guide sleeve 6 is forward sealed.The effect that two kinds of enclosure methods obtain is the same.
Below be the embodiment of the 4th kind of silencing apparatus the present invention relates to, Figure 12 is the sectional arrangement drawing through the air guide sleeve geometric centre axes that utilizes the I. C. engine exhaust catalytic purification silencing apparatus that thin-walled type air guide sleeve configuration makes, and Figure 13 and Figure 14 are respectively the I-I and the J-J cross-sectional views of catalytic purification silencing apparatus shown in Figure 12.
The central axis of silencing apparatus 3 is with single-point line expression among Figure 12.Overlap with the first order air guide sleeve 5 of solid black line drafting and the geometric centre axes of second level air guide sleeve 6, referring to Figure 13 and Figure 14, when the central axis of geometric centre axes and silencing apparatus coincides, with single-point line expression.Because silencing apparatus shown in this example adopts the multiply sprout that makes fluid and air guide sleeve geometric centre axes to be a certain angle and simultaneously centrifugally eliminates the noise with the mode that strikes next stage air guide sleeve or silencing apparatus interior sidewall surface, the impact of high-pressure pulsating air-flow is not easy to cause sympathetic response sound, so the geometric centre axes of the two-stage air guide sleeve of silencing apparatus shown in this example can not overlap mutually with the central axis of silencing apparatus 3.When the geometric centre axes of air guide sleeve did not overlap mutually with the silencing apparatus central axis, geometric centre axes represented that with double dot dash line dotted line is represented the air guide sleeve relevant position of 6 this moments among the figure among Figure 12, and the geometric centre axes of two-stage air guide sleeve still overlaps.
Silencing apparatus is made up of component such as suction tude 1, protecgulum 2, muffler shell 3, locating piece 4, first order air guide sleeve 5, second level air guide sleeve 6, bonnet 8, outlet pipe 9, water conservancy diversion sealed piece 14, preceding sealed piece 15, positioning ring 16 and 17, has opening 5a and 6a on the two-stage air guide sleeve wall.Have a plurality of intensive on positioning ring 16 and 17 the anchor ring around the opening 16a and the 17a that arrange.Suction tude 1 upstream direction of silencing apparatus is extended and is connected with the relief opening of internal-combustion engine.
Be coated with the catalyzer 18 that I. C. engine exhaust is purified on the medial and lateral wall of first order air guide sleeve 5 and the opening 5a wall surface of the hole, specifically apply the position referring to Figure 12, catalyzer 18 and painting method thereof adopt known composition and method.
As shown in figure 12, the inside of silencing apparatus 3 is by first order air guide sleeve 5, second level air guide sleeve 6 and water conservancy diversion sealed piece 14 and preceding sealed piece 15, be separated into successively along the direction of air current flow and between air guide sleeve 5 outsides and air guide sleeve 6 inboards, first interfere chamber 11, and the second interference chamber 12 between the outside, air guide sleeve 6 downstreams and silencing apparatus shell 3 upstreams and protecgulum 2 inboards and positioning ring 16.The opening 5a of first order air guide sleeve is positioned near near air guide sleeve 5 walls the silencing apparatus downstream, and the opening 6a of second level air guide sleeve is placed near on near air guide sleeve 6 walls the silencing apparatus upstream extremity.
The I. C. engine exhaust that flows into silencing apparatus 3 from suction tude 1 directly enters in the air guide sleeve 5, exhaust is transformed into the multiply little airflow when flowing through opening 5a, enter into first and interfere chamber 11, strike eccentrically along opposite each other direction on the inside circumference wall of second level air guide sleeve 6, in the first interference chamber 11, flow towards updrift side then from the downstream of silencing apparatus 3.Then, exhaust airstream passes the opening 6a of second level air guide sleeve 6, is partitioned into the multiply little airflow once more, enters into second and interferes in the chamber 12, strikes eccentrically along opposite each other direction on the inside circumference wall of protecgulum 2 and silencing apparatus shell 3.At last, opening 16a, 17a and outlet pipe 9 are passed in exhaust, enter atmosphere.
Because the engine exhaust gas that flows in the first order air guide sleeve 5 does not expand as yet, has quite high temperature.When the catalyzer 18 that applies on waste gas and air guide sleeve 5 inside circumference walls and the opening 5a wall surface of the hole contacts, catalyzer can be heated to more than the initiation temperature soon, make it to enter into high efficiency catalysis state, make exhaust obtain good purification.The heat that the catalytic reaction that takes place on high-temp waste gas in the air guide sleeve 5 and the interior sidewall surface produces, can make the housing of air guide sleeve 5 soon and the catalyzer 18 on the outer circumference wall reaches and keeping high efficiency to carry out the required temperature of catalyzed chemical reaction, add that second level air guide sleeve 6 is sealed first order air guide sleeve 5 and second level air guide sleeve 6 and silencing apparatus shell 3 between insulation that hot waste gas play and the effect of heating flow through, make waste gas interfere in the chamber 11 and still keeping higher temperature first, thereby make coated whole catalyst area, no matter be positioned at the interior sidewall surface or the outer side surface of air guide sleeve 5, can both enter into high efficiency catalytic purification working state, therefore and can reduce catalyst area significantly, and correspondingly reduce cost by the required coating of purification requirement.
In this routine described silencing apparatus, the down stream port of first order air guide sleeve 5 adopt that end upstream protrudes the thin-walled type cone piece---water conservancy diversion sealed piece 14 entad seals, also with the end sealing of second level air guide sleeve 6, the other end of air guide sleeve 6 is by preceding sealed piece 15 sealings simultaneously for this sealed piece.The cone wall of water conservancy diversion sealed piece 14, can make the exhaust of flowing change about 90 ° of flow direction along the geometric centre axes parallel direction, so that the centrifugal opening 5a that passes through of exhaust, thereby can reduce the reflected pressure intensity of wave of pulsation exhaust, reduce the exhaust back pressure value.
Two-stage air guide sleeve in the silencing apparatus 3 shown in Figure 12 all adopts cylindrical configuration, also can adopt hole enlargement columnar structured.Present embodiment adopts the outlet pipe 9 of general configuration, also it can be transformed into water conservancy diversion bell-type fluid discharge pipe.
In addition, because passing through the exhaust of opening on the two-stage air guide sleeve wall nearly all is vertically to strike on the inside circumference wall of next stage air guide sleeve or silencing apparatus shell 3, so if on these positions, install poromerics, the pulsation energy that its unit area can dissipate and absorb, be higher than far away conventional when pulse pneumatic is flowed along the direction that is parallel to the poromerics plane poromerics unit area to pulsation dissipation of energy and absorptivity.
Among above embodiment one, two and three, the definition of the configuration of the air guide sleeve of inserting in the silencing apparatus and upstream and downstream end thereof mainly is to take all factors into consideration result with balance at the acoustical absorptivity of silencing apparatus and these two aspects of flow resistance coefficient.Described silencing apparatus both had been applicable to the noise that the pulse pneumatic of discharges such as eliminating reciprocating internal combustion engine, piston type air compressor and pneumatic tool produces, can be applicable to the noise reduction of blower ventilation system, the noise elimination discharging when also can be applicable to the urgent step-down of High Temperature High Pressure continuous flow that steam turbine and combustion gas turbine discharge or high-pressure autoclave.
When steam or combustion gas turbine exhaust being carried out step-down and eliminate the noise discharging, the forward and backward lid of the described silencing apparatus of embodiment and fluid intake channel, outlet pipe etc. generally all are cancelled, because High Temperature High Pressure waste gas enters the inlet of silencing apparatus---the upstream extremity of silencing apparatus, usually with the shape and the equal and opposite in direction of its upstream canal that is connected.The cross-section area of silencing apparatus downstream outlet is usually greater than its upstream extremity inlet area.
In addition, high temperature and high pressure steam when silencing apparatus is applied to the urgent step-down of high-pressure autoclave is eliminated the noise and is discharged, this moment, the exhaust back pressure size of silencing apparatus no longer was the leading indicator that influences the silencing apparatus performance, therefore silencing apparatus on, downstream can be exchanged use, it is the fluid intake channel 1 fluidify discharge tube 9 among the described embodiment, discharge tube then becomes intake channel, the also corresponding change of ordering of air guide sleeves at this moment at different levels and interference chamber, be that first order air guide sleeve becomes the afterbody air guide sleeve, afterbody is interfered the chamber to become the first order and is interfered the chamber, the gas that entad flows is transformed into to centrifugal direction flows, vice versa.Remaining changes, and by parity of reasoning.What the benefit of doing like this was to avoid air guide sleeve entad seals that little head end may resonance take place under the impact of high pressure draught and the steam whistle tweeting sound that produces.
When the pulsation source that makes fluid produce pulsation is positioned within the runner, and need to reduce even during isolated this pulse energy influencing to external world, can be in runner in the upstream canal of pulsation source or be respectively charged into one or more levels thin-walled type air guide sleeve in flow passage entry and the downstream canal.The three-dimensional configuration of each air guide sleeve, mutual alignment between air guide sleeve and the runner and cooperate opening shape, position and arrangement on the air guide sleeve wall, relation of cooperatively interacting between the air guide sleeves at different levels or the like, please refer to above detailed description, repeat no more herein four embodiments.
Claims (12)
1. method that makes high-pressure liquid step-down and dampening fluid pulse energy in runner is characterized in that:
Make the fluids that flow along how much central axis parallel directions in the runner, transition flow to be transformed into the multiply sprout;
Make these how much central axis in above-mentioned multiply sprout and the runner or specific vertical symmetry plane be a certain angle and entad or simultaneously opposite direction ground is towards specific vertical symmetry plane two side flow with directly clash into mutually or strike on certain solid surface simultaneously, or being a certain angle and centrifugal simultaneously or while opposite direction ground, to deviate from specific vertical symmetry plane mobile and strike on certain solid surface;
Make the multiply sprout be zero or approach zero making a concerted effort perpendicular to the kinetic energy component on the cross section of these how much central axis in the runner or specific vertical symmetry plane.
2. realize a kind of device of the described method of claim 1, it is characterized in that:
One or more levels thin-walled type air guide sleeve of in a certain section runner that fluid is flowed through, packing into;
The geometric centre axes and the line stretcher thereof of the multistage thin-walled type air guide sleeve of packing in the runner overlap;
Usually, the central axis of the geometric centre axes of air guide sleeve or specific vertical symmetry plane and this section runner or corresponding vertically symmetry plane overlap;
When taking to make multiply sprout and air guide sleeve geometric centre axes to be a certain angle and centrifugal simultaneously or when opposite direction ground deviated from specific vertical symmetry plane mode mobile and that strike certain solid surface and comes the pulse energy of dampening fluid simultaneously, the geometric centre axes of air guide sleeves at different levels or specific vertical symmetry plane can not overlap mutually with central axis or arbitrary vertical symmetry plane of of living in section runner;
Air guide sleeve cross section perpendicular to geometric centre axes or specific vertical symmetry plane is the plane geometric figure of symmetry;
Have on the air guide sleeve wall and allow fluid flow to a plurality of openings of another side from a side of air guide sleeve wall;
Whole opening gross areas on every grade of air guide sleeve wall whole or most, all be positioned at by geometric centre axes or perpendicular to the line stretcher of the air guide sleeve longitudinal section profile line straightway of specific vertical symmetry plane or the tangent line of arc, with the geometric centre axes of air guide sleeve or the angle α of specific vertical symmetry plane≤| 45 ° | and on the air guide sleeve wall in the vertical angles scope.
3. according to the described device of claim 2, it is characterized in that:
The preferred configuration of a plurality of openings that have on the air guide sleeve wall and preferred arrangement are, the shape of each opening of same horizontally-arranged is identical, equal and opposite in direction, the centre of form all is positioned on the same air guide sleeve cross-sectional profiles line perpendicular to geometric centre axes or specific vertical symmetry plane, and each opening is vertically arranged symmetrically;
The opening position that adjacent air guide sleeve is positioned on the wall at horizontal mutually intussusception position is vertically evenly staggered symmetrically, laterally the suitable distance of skew mutually.
4. according to the described device of claim 2, it is characterized in that:
Whole opening gross areas on each air guide sleeve wall whole or most, residing optimum position is, be positioned at by geometric centre axes or perpendicular to the line stretcher of the air guide sleeve longitudinal section profile line straightway of specific vertical symmetry plane or the tangent line of arc, with the geometric centre axes of air guide sleeve or specific vertical symmetry plane angle α≤| 30 ° | and on the air guide sleeve wall in the vertical angles scope.
5. one kind is characterized in that the described device of claim 2 be applied to the to decay pulse energy of pulsating fluid and the silencing apparatus made:
The central axis of the geometric centre axes of air guide sleeve and of living in section runner coincides;
One end of air guide sleeve entad seals, and the outer side surface of the other end is connected with the runner interior sidewall surface and seals;
Air guide sleeve longitudinal section by the geometric centre axes entad profile line of closed end is streamlined;
Air guide sleeve with the perpendicular cross-sectional profiles line of geometric centre axes be the plane symmetry figure.
6. one kind is characterized in that the described device of claim 2 be applied to the to decay pulse energy of pulsating fluid and the silencing apparatus made:
Specific vertical symmetry plane of air guide sleeve to the distance of air guide sleeve both sides sidewall equates that corresponding vertical symmetry plane of this specific vertical symmetry plane and of living in section runner coincides;
One end of air guide sleeve is towards specific vertical symmetry plane sealing, and the outer side surface of the other end is connected with the runner interior sidewall surface and seals;
The shape of thin-walled type air guide sleeve is similar to the shape of thin-walled type arched door;
The arched door opening end of air guide sleeve both sides closely is connected with the runner interior sidewall surface.
7. one kind is characterized in that the described device of claim 2 be applied to the to decay pulse energy of pulsating fluid and the silencing apparatus made:
The central axis of the geometric centre axes of air guide sleeve and of living in section runner coincides;
One end of air guide sleeve entad seals, and the outer side surface of the other end is connected with the runner interior sidewall surface and seals;
The thin-walled type air guide sleeve is conical, or conical and the columnar combination of hole enlargement.
8. one kind is applied to cleaning internal combustion engines exhaust gases and decay I. C. engine exhaust pulse energy with the described device of claim 2 and the catalytic purification silencing apparatus made is characterized in that:
The thin-walled type air guide sleeve is a cylindrical shape, also can use the hole enlargement cylindrical shape instead;
With the end sealing of second level air guide sleeve (6), the other end of air guide sleeve (6) is sealed by preceding sealed piece (15) downstream of first order air guide sleeve (5) simultaneously with water conservancy diversion sealed piece (14) sealing, this sealed piece.
9. according to the described internal-combustion engine catalyst purifying exhaust gas of claim 8 silencing apparatus, it is characterized in that:
All be coated with cleaning catalyst (18) on the interior outer side surface of first order air guide sleeve (5) and opening (5a) wall;
The water conservancy diversion sealed piece (14) of first order air guide sleeve (5) downstream is the conical thin-walled member that protrudes to the runner updrift side.
10. according to claim 5,6,7 or 8 described silencing apparatuss, it is characterized in that:
The fluid discharge pipe of silencing apparatus downstream can be transformed into thin-walled type water conservancy diversion bell-type fluid discharge pipe (9), Here it is with the upstream extremity sealing of fluid discharge pipe commonly used, and have a plurality of openings (9c) symmetrically being positioned on one section inner fluid discharge pipe sidewall of suppressor case (3);
The opening (9c) that is positioned on the water conservancy diversion bell-type fluid discharge pipe wall at horizontal mutually intussusception position is vertically staggered symmetrically mutually with the opening position on the adjacent air guide sleeve wall, laterally the suitable distance of skew mutually.
11. a silencing apparatus that the described device of claim 2 is applied to pressurized gas step-down discharging and makes, the structure of silencing apparatus can adopt claim 5,6 or 7 configuration, it is characterized in that:
The upstream and downstream position of silencing apparatus can exchange.
12. one kind is applied to the fluid pulsation kinetic energy of decaying and being caused by the pulsation source in the runner with the described device of claim 2, it is characterized in that:
In the upstream canal of pulsation source or in upstream canal ingress and the downstream canal, have the thin-walled type air guide sleeve of a plurality of openings on one or more levels wall of respectively packing into.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01102789 CN1368594A (en) | 2001-01-28 | 2001-01-28 | Method and apparatus for reducing pressure of high-pressure fluid and attenuating pulse energy of fluid in channel |
| PCT/CN2002/000040 WO2002059522A1 (en) | 2001-01-28 | 2002-01-24 | Method for reducing pressure and pulsant energy of high-pressure fluid in a flow pipe and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01102789 CN1368594A (en) | 2001-01-28 | 2001-01-28 | Method and apparatus for reducing pressure of high-pressure fluid and attenuating pulse energy of fluid in channel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1368594A true CN1368594A (en) | 2002-09-11 |
Family
ID=4652988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01102789 Pending CN1368594A (en) | 2001-01-28 | 2001-01-28 | Method and apparatus for reducing pressure of high-pressure fluid and attenuating pulse energy of fluid in channel |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1368594A (en) |
| WO (1) | WO2002059522A1 (en) |
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| CN102913712A (en) * | 2012-10-30 | 2013-02-06 | 长城汽车股份有限公司 | Vibration-reducing and noise-reducing device of high-pressure oil pipe of vehicle steering system |
| CN103256447A (en) * | 2013-06-06 | 2013-08-21 | 兰州理工大学 | Pipeline depressurization device |
| CN103672284A (en) * | 2013-12-04 | 2014-03-26 | 大连愚人设计有限公司 | Vortex local pressure reducing pipe sealing structure |
| CN103953818A (en) * | 2014-04-03 | 2014-07-30 | 段乐乐 | Different-diameter anti-drag pipeline |
| CN104006260A (en) * | 2014-06-09 | 2014-08-27 | 江苏业安环保设备科技有限公司 | Water pipe flow stabilizing broadband muffler |
| CN104913148A (en) * | 2015-04-22 | 2015-09-16 | 苏州纽威阀门股份有限公司 | Multi-stage denoiser and valve with same |
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| CN105556191A (en) * | 2013-10-31 | 2016-05-04 | 三菱日立电力***株式会社 | Multistage pressure reduction device and boiler |
| CN107631120A (en) * | 2017-10-30 | 2018-01-26 | 蚌埠新奥能源发展有限公司 | A kind of Gas Pipe silencing means |
| CN108266590A (en) * | 2016-12-30 | 2018-07-10 | 艾默生过程管理调节技术公司 | For the noise muffler being used together with process control equipment |
| CN108331991A (en) * | 2018-03-26 | 2018-07-27 | 连云港宇泰电力设备有限公司 | Combined steam vent silencer |
| CN114992419A (en) * | 2022-05-31 | 2022-09-02 | 中国船舶重工集团公司第七一九研究所 | Steam pressure-reducing and temperature-reducing device |
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| CN104989869A (en) * | 2015-07-08 | 2015-10-21 | 中国船舶重工集团公司第七一九研究所 | Water pipe noise elimination and flow rectifier |
| CN114194354B (en) * | 2021-12-10 | 2024-01-23 | 海鹰企业集团有限责任公司 | Design method of bionic type air guide sleeve with noise reduction function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4094644A (en) * | 1975-12-08 | 1978-06-13 | Uop Inc. | Catalytic exhaust muffler for motorcycles |
| GB2228771A (en) * | 1989-01-27 | 1990-09-05 | Smr Technologies Inc | Refuelling surge boot |
| JP2618764B2 (en) * | 1991-04-26 | 1997-06-11 | 本田技研工業株式会社 | Method and apparatus for purifying exhaust gas of an internal combustion engine |
| DE4339124C2 (en) * | 1993-11-16 | 1995-11-23 | Amc Gmbh | Motorcycle silencer |
| JPH0869286A (en) * | 1994-08-30 | 1996-03-12 | Hitachi Ltd | Muffler for compressor |
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2001
- 2001-01-28 CN CN 01102789 patent/CN1368594A/en active Pending
-
2002
- 2002-01-24 WO PCT/CN2002/000040 patent/WO2002059522A1/en not_active Application Discontinuation
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| CN102913712A (en) * | 2012-10-30 | 2013-02-06 | 长城汽车股份有限公司 | Vibration-reducing and noise-reducing device of high-pressure oil pipe of vehicle steering system |
| CN103256447A (en) * | 2013-06-06 | 2013-08-21 | 兰州理工大学 | Pipeline depressurization device |
| CN103256447B (en) * | 2013-06-06 | 2015-04-01 | 兰州理工大学 | Pipeline depressurization device |
| CN105556191A (en) * | 2013-10-31 | 2016-05-04 | 三菱日立电力***株式会社 | Multistage pressure reduction device and boiler |
| CN103672284A (en) * | 2013-12-04 | 2014-03-26 | 大连愚人设计有限公司 | Vortex local pressure reducing pipe sealing structure |
| CN103953818A (en) * | 2014-04-03 | 2014-07-30 | 段乐乐 | Different-diameter anti-drag pipeline |
| CN104006260A (en) * | 2014-06-09 | 2014-08-27 | 江苏业安环保设备科技有限公司 | Water pipe flow stabilizing broadband muffler |
| CN104006260B (en) * | 2014-06-09 | 2016-02-24 | 江苏业安环保设备科技有限公司 | Water lines current stabilization Broad Band Muffler |
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| CN104913148A (en) * | 2015-04-22 | 2015-09-16 | 苏州纽威阀门股份有限公司 | Multi-stage denoiser and valve with same |
| CN105443909A (en) * | 2015-12-03 | 2016-03-30 | 重庆互通管道技术设备有限公司 | Damping bent pipe |
| CN108266590A (en) * | 2016-12-30 | 2018-07-10 | 艾默生过程管理调节技术公司 | For the noise muffler being used together with process control equipment |
| CN108266590B (en) * | 2016-12-30 | 2021-12-31 | 艾默生过程管理调节技术公司 | Noise attenuator for use with process control devices |
| CN107631120A (en) * | 2017-10-30 | 2018-01-26 | 蚌埠新奥能源发展有限公司 | A kind of Gas Pipe silencing means |
| CN108331991A (en) * | 2018-03-26 | 2018-07-27 | 连云港宇泰电力设备有限公司 | Combined steam vent silencer |
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| WO2002059522A1 (en) | 2002-08-01 |
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