WO2002059522A1 - Procede de reduction de la pression et de l'energie pulsatoire d'un fluide haute pression dans un conduit d'ecoulement et dispositif associe - Google Patents

Procede de reduction de la pression et de l'energie pulsatoire d'un fluide haute pression dans un conduit d'ecoulement et dispositif associe Download PDF

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Publication number
WO2002059522A1
WO2002059522A1 PCT/CN2002/000040 CN0200040W WO02059522A1 WO 2002059522 A1 WO2002059522 A1 WO 2002059522A1 CN 0200040 W CN0200040 W CN 0200040W WO 02059522 A1 WO02059522 A1 WO 02059522A1
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WIPO (PCT)
Prior art keywords
shroud
flow
muffler
center axis
fluid
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Application number
PCT/CN2002/000040
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English (en)
Chinese (zh)
Inventor
Chong Wang
Yang Wang
Original Assignee
Chong Wang
Yang Wang
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Filing date
Publication date
Application filed by Chong Wang, Yang Wang filed Critical Chong Wang
Publication of WO2002059522A1 publication Critical patent/WO2002059522A1/fr

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Classifications

    • 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
    • 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

Definitions

  • the invention relates to a method for depressurizing high-pressure fluid and damping the pulsating kinetic energy of the fluid in a flow channel, and a corresponding device, and a muffler made according to the structure of the device.
  • a porous material is filled in the flow channel to dissipate and absorb the pulsating kinetic energy.
  • the object of the present invention is to provide a practical method for reducing the pressure of a high-pressure fluid and attenuating the pulsating kinetic energy of a fluid in a flow channel on the basis of the principle of coherent wave mutual interference.
  • the present invention also provides a method for implementing the method Device, and several configurations of mufflers made according to the basic structure of the device.
  • Geometric center axis The cross-section of the center point of the thin-walled shroud, whose cross-section is a plane symmetrical geometry, is usually a straight line, which is indicated by a double-dotted line in the drawings of this specification.
  • the method adopted by the present invention is to make the fluid flowing in the flow channel along a geometric center axis parallel to the direction, change the flow direction and transform into a plurality of small tributaries; make the multiple small branches and the geometric center in the flow channel
  • An axis or a specific longitudinal symmetry plane in the flow channel is at an angle and flows toward the two sides of the specific longitudinal symmetry plane and collides with each other at the same time in the direction of the center or in the opposite direction at the same time, or at the same time in the direction of the center or the opposite direction
  • the specific vertical When the two sides of the symmetry plane flow, they hit the outer side wall surface of the next-stage shroud, or at a certain angle and simultaneously centrifuge or in opposite directions simultaneously flow away from the specific longitudinal symmetry plane and hit the next-stage shroud or flow
  • the shape of the shroud is closed at one end concentrically, and the outer wall surface at the other end is connected and closed to the inner wall surface of the flow channel. Its shape is a thin-walled member similar to a missile or rocket head.
  • the geometric center axis of the multi-stage shroud and its extension line or the specific longitudinal symmetry plane and its extension surface coincide with each other, and the geometric center axis of the shroud at all levels or its specific longitudinal symmetry plane is usually the same as that of the flow channel in which it is located.
  • the central axis or the corresponding longitudinal symmetry plane coincide; when multiple small tributaries are adopted to form an angle with the geometric center axis of the shroud or a specific longitudinal symmetry plane, and they are centrifuged at the same time or flow away from the specific longitudinal symmetry plane and impinge on a certain
  • the geometric center axis or a specific longitudinal symmetry plane of the shrouds at all levels may not coincide with the center axis of any flow channel or any longitudinal symmetry plane.
  • the cross-section of the shroud that is perpendicular to the geometric center axis or a specific longitudinal symmetry plane is a symmetrical planar geometric figure, such as a circle, an oval, an oblate or a rounded rectangle, or even a circular ring or an equilateral geometric figure .
  • Each of the shroud walls is provided with a plurality of flow holes that allow fluid to flow from one side to the other side of the shroud wall.
  • the preferred configuration of the flow holes and the preferred arrangement of the flow holes on the shroud wall surface are: The shape and size of each flow hole in the same horizontal row are equal, and the centroids of the flow holes in the row are located on the same cross-section wall of the shroud perpendicular to the geometric center axis or a specific longitudinal symmetry plane, and the flow holes are uniform in the longitudinal direction. Symmetrically arranged.
  • the through-holes of adjacent shrouds located on the wall surface of the laterally overlapping portion are symmetrically and uniformly staggered in the longitudinal direction, and laterally offset by an appropriate distance from each other.
  • All or most of the total hole area of all the flow holes on the wall of each shroud are located on the straight line of the longitudinal section of the shroud through the geometric center axis of the shroud or perpendicular to the specific longitudinal symmetry plane of the shroud
  • 45 ° I and the surface of the shroud within the range of the vertex angle, the placement of the flow holes is optimal.
  • the position is the included angle a
  • the present invention also provides several examples of mufflers manufactured by using the above method to mute the sound according to the configuration of the above device.
  • the thin-walled shroud in the muffler embodiment is based on different geometries of the flow channel in which it is located. Shape and choose a different three-dimensional geometric configuration.
  • the muffler made according to the basic structure of the device of the present invention is easy to install multiple / multi-stage thin-walled shrouds in a limited space, thereby enabling multi-stage pressure reduction of high-pressure continuous fluid and multi-stage pulsation of pulsating fluid.
  • the manufactured device and muffler can achieve a good attenuation of the pulsating kinetic energy contained in the fluid, whether at low or high frequencies; No additional energy is needed to attenuate the pulsating kinetic energy of the pulsating fluid; the manufactured muffler can avoid the existing
  • the muffler has secondary noise that may be caused by the vibration of the shell due to the transient transient imbalance of the internal force of the muffler.
  • This type of muffler has a wide range of applications, which can be used for the decompression of high-pressure continuous airflow and can be used for high pressure.
  • the pulsating kinetic energy attenuation of pulsating airflow can also be applied to attenuating the pulsating kinetic energy of liquid fluids.
  • the muffler adopting the method of the present invention to reduce the pressure of high-pressure fluid and attenuate the pulsating kinetic energy of fluids changes its shape to adapt to the placement position and volume. Size, flow resistance coefficient, muffler efficiency and price-performance ratio Compared with the existing silencer, obviously it has a good overall performance.
  • the muffler of the present invention When the muffler of the present invention is used as an exhaust muffler of a reciprocating internal combustion engine, compared with the original exhaust muffler of the internal combustion engine, the exhaust gas is exhausted under the condition that the shape, volume and exhaust back pressure of the two are substantially equal Noise reduction by 3 to 7dB.
  • the use of the method of the present invention to muffle the sound and the use of the device configuration of the invention to produce a catalytic purification exhaust muffler for an internal combustion engine also has the advantages of easy miniaturization and the entire area of the catalyst coated in the catalyst in an efficient catalytic purification state .
  • Fig. 1 is a longitudinal sectional view of a cylindrical flow passage muffler passing through a geometric center axis of a shroud.
  • Figure 2, Figure 3, and Figure 4 are three cross-sectional views of the muffler A-A, B-B, and C-C shown in Figure 1, respectively.
  • Figure 5 is a longitudinal cross-section of the flat cylindrical flow channel muffler through the flow channel cross-section short axis of symmetry Illustration.
  • FIG. 6 and 7 are D-D and E-E cross-sectional views of the muffler shown in FIG.
  • Fig. 8 is a cross-sectional view taken along the line F-F of the muffler shown in Fig. 5, that is, a longitudinal cross-sectional view through the long symmetry axis of the cross-section of the muffler and a specific symmetry plane of the shroud.
  • Figure 9 is a longitudinal section through the geometric center axis of the shroud of the enlarged cylindrical flow channel muffler.
  • Figures 10 and 11 are G-G and H-H cross-sectional views of the muffler shown in Figure 9, respectively.
  • Figure 12 is a longitudinal section through the geometric center axis of the shroud of an exhaust gas catalytic purification muffler for an internal combustion engine made of a thin-wall shroud configuration.
  • FIG. 13 and 14 are I-I and J-J cross-sectional views of the catalytic purification muffler shown in Fig. 12, respectively. detailed description
  • FIG. 1 is a longitudinal sectional view of a cylindrical flow channel muffler according to the present invention, and the cut plane passes through the geometric center axis of the built-in guide cover.
  • the muffler consists of a fluid inflow pipe 1, a front cover 2, a muffler housing 3, a positioning member 4, a first-stage shroud 5, a second-stage shroud 6, a third-stage shroud 7, a rear cover 8 and a fluid discharge pipe. It is composed of 9 parts and other parts, and fluid flow holes 5a, 5b, 6b, and 7b are opened on the wall surface of each level of the shroud.
  • the area surrounded by the inner side of the muffler housing is a section of flow channel through which the fluid flows.
  • the geometric center axis of each shroud coincides with the center axis of the flow channel in this section, see Figure 1, Figure 2, Figure 3 and Figure 4.
  • the end facing the inflow of fluid is referred to as the upstream end of the muffler or its components, and the end out of the fluid is referred to as the downstream end. Therefore, the shroud that first faces the flowing fluid is referred to as the first
  • the first-stage shroud which is called the second-stage shroud in turn, the third-stage shroud ...
  • the number of stages of the shroud provided in each muffler mainly depends on the required amount of noise and flow The comprehensive balance between the two.
  • the upstream ends of the thin-walled shrouds at all levels are closed concentrically toward the geometric center axis, and the shape is a streamlined thin shell structure similar to the missile or rocket head to reduce the flow resistance of the fluid.
  • the outer wall surface of the downstream end of the shroud and the inner wall surface of the muffler housing 3 are sealed and welded to each other, see FIG. 1.
  • the inside of the muffler 3 is sequentially divided into an expansion chamber 10 from an upstream end to a downstream end by a thin-walled shroud 5, 6, and 7, a first interference chamber 11, a second interference chamber 12, and a third Interference room 13.
  • the fluid passes through the fluid inflow pipe 1 penetrating the front cover 2 and enters the muffler 3, and expands or slows down the flow velocity in the expansion chamber 10, and the three-dimensional geometry of the shroud makes the parallel direction along the geometric center axis of the shroud in the section of the flow channel
  • the flow direction of the flowing fluid is deflected, and then the fluid passes through the circulation holes 5a and 5b on the wall of the first-stage shroud 5 and turns into a plurality of small tributaries, which are simultaneously centered symmetrically at an angle with the geometric center axis flow.
  • the flow holes 5a on the front half of the shroud wall of the first stage shroud 5 near the upstream end adopt a configuration in which multiple small-aperture holes are densely and symmetrically arranged along the cross-section circumferential surface, and the small tributaries passing through 5a are in the first interference chamber 11
  • the inward centers directly hit each other, expand or slow down the flow rate.
  • 45 ° I of the center axis of the flow hood can also be opened on the wall surface within the range of the opposite angle of ⁇ .
  • the preferred position of each flow hole is on the wall of the shroud in the range of ⁇
  • the smaller the included angle the larger the radial kinetic energy component of the small tributary flow flowing through each flow hole, and the axial kinetic energy The smaller the portion.
  • the centroids are located on the same cross-section wall, and they are longitudinally symmetrically and uniformly arranged, so the radial kinetic energy components of the fluid flowing through can be combined. Is zero. Under the above-mentioned conditions, the larger the radial kinetic energy component of each small tributary, the better the noise reduction effect.
  • the discharge pipe of the muffler can also be transformed into a shroud-type fluid discharge pipe 9, which is to close the upstream end of the ordinary fluid discharge pipe, and extend the part of the discharge pipe located in the 'muffler, and A plurality of holes 9c are symmetrically opened on the side wall of the pipe according to the method of opening holes on the wall surface of the shroud, thereby increasing multiple levels of muffling functions.
  • the positional relationship between the flow holes 9c on the wall surface of the fluid discharge pipe 9 and the flow holes 7b on the wall surface of the adjacent shroud 7 is the same as that of the flow holes on the wall surface of two adjacent shrouds. Guidelines for avoiding or minimizing the effects of direct flow through the fluid are shown in Figures 1 and C-C cross-section Figure 4.
  • the positioning member 4 in the muffler 3 is used to fix the front end of the first-stage shroud 5 to ensure that the geometric center axis of the shroud 5 coincides with the center axis of the muffler shell 3 to avoid the position of the front end of the shroud being deviated. Move and trigger the whistle sound under the impact of high pressure fluid.
  • the front end of the positioning member 4 in the muffler in this example is also bent to form a fixed rotor blade. See FIG. 1 and A-A cross-sectional view 2. The rotor blade rotates the fluid flowing around the axis, which is beneficial to the flow to 5b.
  • the fluid on the side of the shell can also smoothly flow through 5b, which can reduce the flow resistance.
  • the cross section of the flow passage in the muffler is a plane symmetrical geometric figure of various shapes, such as a circle, an ellipse, an oblate circle, a rounded rectangle, or an equilateral polygon
  • the plane symmetrical geometry is long and short perpendicular to each other
  • the length of the two axes of symmetry is relatively small.
  • the cross-sectional profile of the thin-walled shroud can be the same plane symmetrical geometry as the cross-section of the runner.
  • the cross-section of the runner and the shroud can be selected.
  • the cross-sections can also use a combination of the above-mentioned various plane symmetrical geometries.
  • FIG. 5 is a longitudinal sectional view of a second type of muffler according to the present invention cut through a symmetrical short axis of a cross-sectional graphic of a flow channel.
  • the muffler is made of fluid flowing into a pipe 1, a front cover 2, a muffler housing 3, and a first-stage shroud 5.
  • Second-stage shroud 6, third-stage shroud 7, rear cover 8, and two fluid discharge pipes 9, and other components, and fluid flow holes 5b, 6b, and 7b are opened on the wall surface of each stage .
  • the cross-section of the muffler 3 is oblate, and may also be oval, rounded rectangle, or other cross-sections having two mutually perpendicular symmetry axes.
  • the long and short symmetry axes of the plane symmetrical geometric figure are perpendicular to each other and the length of the two axes is relatively large, for example, greater than two.
  • the upstream ends of the thin-walled shrouds at all levels are closed by themselves toward a certain longitudinal symmetrical plane, and the outer wall surface of the downstream end is connected and closed with the inner wall surface of the muffler 3.
  • the profile of the upstream end of the shroud longitudinal section parallel to the longitudinal plane made by the short-axis of symmetry of the cross-sectional figure is streamlined, see Figure 5.
  • the shape of the entire shroud is similar to that of a thin-walled arch.
  • the distance from the longitudinal plane formed by the long symmetry axis in the cross-section pattern of the muffler housing 3 to the south side wall of the shroud is equal, so the longitudinal section F-F cut along the long symmetry axis is also the shroud.
  • the shrouds 5, 6, and 7 divide the interior of the muffler 3 into the expansion chamber 10, the first interference chamber 11, the second interference chamber 12, and the third interference chamber 13 in order from the upstream end to the downstream end.
  • the fluid enters the expansion chamber 10 through the inflow pipe 1 to expand and slow down the flow rate, and then passes through the flow holes 5b on the two side walls of the first-stage shroud 5 to transform into multiple small tributaries, which are symmetrical to the specificity of the shroud.
  • the longitudinal symmetry plane F-F flows at the same time in opposite directions at an angle.
  • the small tributaries flowing through the side wall holes 5b on both sides of the shroud 5 meet in opposite directions, collide, expand or slow down at a certain longitudinal symmetry plane F-F position in the first interference chamber 11, or impinge on each other in opposite directions.
  • the same horizontal rows of flow holes on the two side walls of each shroud are the same shape, the same size, and the holes
  • the centroids are located on the hood wall surface of the same cross-section, and are longitudinally and uniformly symmetrically arranged.
  • the positions of the flow holes on the wall of the adjacent shrouds of the adjacent shrouds are symmetrical and uniformly staggered longitudinally, and the laterals are offset by an appropriate distance from each other, see FIG. 5 and its D-D cross-section FIG. 6 and E-E cross-sectional view 7 , And F-F longitudinal sectional view coincident with a specific longitudinal symmetry plane 8.
  • the muffler described in this example uses two shroud-type fluid discharge pipes 9, which can be used to increase the total cross-sectional area of the discharge pipe, reduce the flow resistance, and increase the aesthetic sense.
  • the circulation holes on the wall of this part can also use multiple small-aperture holes arranged longitudinally and laterally symmetrically and densely. Configuration.
  • the thin-walled arch-shaped shroud installed in the muffler 3 described in this example may also adopt a plane passing through the short symmetry axis of the cross section as a specific longitudinal symmetry plane, that is, the shroud and the muffler shell shown in Figs. 6 and 7 3 Relative position rotated 90 ° around the geometric symmetry axis
  • the vertical surface formed by perpendicularly intersecting the longitudinal plane formed by the short axis of symmetry of the cross section and equal distance from the wall of the flow channel is an arc.
  • the longitudinal arc surface can be used as a specific longitudinal symmetry surface to manufacture a curved-wall thin-wall arch-shaped shroud to match the shape of the flow channel.
  • the built-in thin-walled shroud can be closed with a circular ring on the upstream end.
  • Shroud configuration The cross section of the shroud is a circular ring formed by double concentric circles. The contour line of the longitudinal section through the geometric center axis is double-peaked, and the peak is the upstream end of the shroud.
  • the three-dimensional shape of the shroud is transversely cut from the middle of the shroud described in FIG.
  • the cutouts of the front and rear halves of the shroud are aligned and welded in a similar configuration.
  • the distance from the specific longitudinal symmetry plane of the shroud to the walls of the two sides of the shroud is equal.
  • the specific longitudinal symmetry plane is cylindrical or expanded.
  • the lateral / radial kinetic energy components of each small tributary are symmetrical at the specific longitudinal symmetry. Faces and their vicinity cancel each other.
  • Fig. 9 is a longitudinal view of the third muffler according to the present invention passing through the geometric center axis of the shroud; Sectional views, Figures 10 and 11 are G-G and H-H cross-sectional views of the muffler, respectively.
  • the length-to-diameter ratio of the runner is large.
  • the muffler is composed of a fluid inflow pipe 1, a muffler shell 3, a positioning member 4, a first-stage shroud 5, a second-stage shroud 6, a rear cover 8 and a fluid discharge pipe 9.
  • the two-stage shroud wall surface Flow holes 5a and 6a are opened, respectively. ⁇
  • the first-stage shroud 5 is a conical thin-walled member
  • the second-stage shroud 6 is a thin-walled member formed by combining the conical shape at the upstream end with the enlarged cylindrical wall body behind it. If necessary, the number of stages of the built-in shroud can be increased to further reduce the noise.
  • the upstream ends of the shrouds of all levels are closed to the center by themselves, the outer wall surface of the downstream end is tightly connected to the inner wall surface of the muffler shell 3, and the geometric center axis of the shroud coincides with the center axis of the muffler.
  • the shrouds 5 and 6 divide the interior of the muffler 3 into the expansion chamber 10, the first interference chamber 11 and the second interference chamber 12 in order from the upstream end to the downstream end in this order.
  • FIG. 9 and FIG. 10 The configuration of densely arranged uniform and symmetrical surroundings is shown in FIG. 9 and FIG. 10. Basically, the second-stage shroud 6 and the fluid discharge pipe 9 are telescoped horizontally. However, the muffler shown in FIG. The configuration of densely distributed uniform and symmetrical surrounding surfaces will cause a direct crossing effect between the two, but also reduce the flow resistance coefficient.
  • the upstream end of the shroud-type fluid discharge pipe 9 is not closed by itself, but is extended by the discharge pipe 9 in the upstream direction and abutted against the second-stage guide
  • the inner wall surface of the upstream end of the cover 6 is closed.
  • FIG. 12 is a longitudinal cross-sectional view of the exhaust gas catalytic purification muffler made of a thin-walled shroud through the geometric center axis of the shroud
  • FIG. 13 And FIG. 14 are I-I and J-J cross-sectional views of the catalytic purification muffler shown in FIG. 12, respectively.
  • the center axis of the muffler 3 in FIG. 12 is indicated by a one-dot chain line.
  • the geometric center axes of the first-stage shroud 5 and the second-stage shroud 6 drawn with solid black lines coincide with each other. See FIGS. 13 and 14. When the geometric center axis coincides with the center axis of the muffler, a single point Underlined.
  • the muffler shown in this example uses a method of making multiple small branches of fluid at a certain angle with the geometric center axis of the shroud and simultaneously centrifuging and striking the inner wall surface of the next-stage shroud or muffler, the high-pressure pulsating airflow It is not easy to cause a resonance sound due to the impact, so the geometric center axis of the two-stage shroud of the muffler shown in this example and the center axis of the muffler 3 may not coincide with each other.
  • the geometric center axis of the shroud and the center axis of the muffler do not coincide with each other in FIG. 12, the geometric center axis is indicated by a two-dot chain line, and the dotted line in the figure indicates the corresponding position of the shroud 6 at this time.
  • the geometric central axes still coincide.
  • the muffler is composed of an intake pipe 1, a front cover 2, a muffler housing 3, a positioning member 4, a first-stage shroud 5, a second-stage shroud 6, a rear cover 8, an exhaust pipe 9, a diversion sealing member 14, a front
  • the sealing member 15, the positioning rings 16 and 17 are composed of parts, and the through holes 5a and 6a are respectively formed on the wall surface of the two-stage shroud.
  • the annular surfaces of the positioning rings 16 and 17 are formed with a plurality of densely arranged flow holes 16a and 17a.
  • the intake pipe 1 of the muffler extends upstream and is connected to the exhaust port of the internal combustion engine.
  • the inside and outside wall surfaces of the first-stage shroud 5 and the hole wall surfaces of the flow holes 5a are coated with a catalyst 18 that can purify the exhaust gas of the internal combustion engine.
  • a catalyst 18 that can purify the exhaust gas of the internal combustion engine.
  • the catalyst 18 and its coating method are adopted. Well-known ingredients and methods.
  • the interior of the muffler 3 is sequentially divided into the airflow guide 5, the second airflow guide 6, and the airflow seal 14 and the front seal 15 in the direction of the airflow.
  • the flow holes 5a of the first-stage shroud are located on the wall surface of the shroud 5 near the downstream end of the muffler, and the flow holes 6a of the second-stage shroud are placed on the wall surface of the shroud 6 near the upstream end of the muffler.
  • the exhaust gas of the internal combustion engine flowing from the intake pipe 1 into the muffler 3 directly enters the shroud 5, and when the exhaust gas flows through the flow hole 5a, it turns into a plurality of small airflows, enters the first interference chamber 11, and goes in mutually opposite directions
  • the centrifugal impact hits the inner circumferential wall surface of the second-stage shroud 6 and then flows from the downstream of the muffler 3 toward the upstream in the first interference chamber 11.
  • the exhaust gas flow passes through the flow hole 6a of the second-stage shroud 6 and is again divided into a plurality of small airflows, enters the second interference chamber 12, and impacts the front cover in a centrifugal direction in mutually opposite directions. 2 and muffler shell 3 on the inner circumferential wall surface.
  • the exhaust gas passes through the flow holes 16a, 17a and the exhaust gas Tube 9, vented into the atmosphere.
  • the exhaust gas from the internal combustion engine flowing into the first-stage shroud 5 has not yet expanded, it has a relatively high temperature.
  • the catalyst can be quickly heated above the light-off temperature, so that it enters a highly efficient catalytic state, and the exhaust gas is discharged. Get good purification.
  • the high-temperature exhaust gas in the shroud 5 and the heat generated by the catalytic reaction on the inner wall surface can soon make the casing of the shroud 5 and the catalyst 18 on the outer circumferential wall surface achieve and maintain a highly efficient catalytic chemical reaction.
  • the required temperature, plus the second-stage shroud 6 encloses the first-stage shroud 5 and the heat insulation caused by the hot exhaust gas flowing between the second-stage shroud 6 and the muffler shell 3
  • the heating effect keeps the exhaust gas at a relatively high temperature in the first interference chamber 11, so that the entire area of the coated catalyst, whether it is located on the inner side wall surface or the outer side wall surface of the shroud 5, can reach a high level.
  • Efficient catalytic purification working conditions and therefore can significantly reduce the area of catalyst to be coated according to purification requirements, and correspondingly reduce costs.
  • the downstream port of the first-stage shroud 5 is sealed with a thin-walled conical piece protruding to the upstream end, a diversion sealing member 14, which seals the second section at the same time.
  • a diversion sealing member 14 which seals the second section at the same time.
  • One end of the stage shroud 6 is closed, and the other end of the shroud 6 is closed by a front seal 15.
  • the conical wall surface of the deflector 14 sealing member 14 can change the flow direction of the exhaust gas flowing parallel to the geometric center axis in a direction of about 90 °, so that the exhaust gas can centrifugally pass through the flow hole 5a, thereby reducing the reflected pressure wave of the pulsating exhaust gas. Strength, reducing exhaust back pressure.
  • the two-stage shroud in muffler 3 shown in Fig. 12 adopts a cylindrical structure, and an enlarged diameter cylindrical structure can also be adopted.
  • This embodiment adopts a general configuration of the exhaust pipe 9, which can also be changed into a shroud type fluid discharge pipe.
  • the configuration of the shroud built into the muffler and the definitions of its upstream and downstream ends are mainly directed to the two of the muffler capacity and the flow resistance coefficient.
  • the muffler is not only suitable for eliminating the noise generated by the pulsating airflow emitted by reciprocating internal combustion engines, piston air compressors and pneumatic tools, etc., but also can be used for noise reduction of blower ventilation systems, and can also be used for exhaust from steam turbines and gas turbines. High temperature and high pressure continuous air flow, or noise reduction during high pressure boiler emergency depressurization.
  • the front and rear covers of the muffler described in the embodiment and the fluid inflow pipe and outflow pipe are generally cancelled because high temperature and high pressure exhaust gas enters the muffler inlet—
  • the upstream end of the muffler is usually the same shape and size as its upstream flow path.
  • the cross-sectional area of the outlet at the downstream end of the muffler is usually larger than the inlet area at its upstream end.
  • the exhaust back pressure of the muffler is no longer the main indicator affecting the performance of the muffler, so the upstream and downstream ends of the muffler can be used interchangeably. That is, the fluid inflow pipe 1 in the embodiment becomes a fluid discharge pipe 9, and the discharge pipe becomes an inflow pipe.
  • the order of the shrouds and interference chambers at different levels also changes accordingly, that is, the first-stage shroud It becomes the last-stage shroud, and the last-stage interference chamber becomes the first-stage interference chamber.
  • the pulsating source that makes the fluid pulsate When the pulsating source that makes the fluid pulsate is located in the flow channel, and the influence of the pulsating kinetic energy on the outside needs to be reduced or even isolated, it can be installed in the upstream flow channel or the flow channel population and the downstream flow channel of the pulsation source in the flow channel.
  • One or more thin wall shrouds The three-dimensional configuration of each shroud, the mutual position and cooperation between the shroud and the flow channel, the shape, location and arrangement of the flow holes on the wall of the shroud, the coordination relationship between the shrouds at various levels, etc. Please refer to the detailed description of the four embodiments above, which will not be repeated here.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust Silencers (AREA)

Abstract

La présente invention se rapporte à un procédé de réduction de la pression et de l'énergie pulsatoire d'un fluide haute pression ainsi qu'à un dispositif associé, notamment à certains types de silencieux. Ledit dispositif comporte un revêtement de guidage du fluide dans un conduit d'écoulement. Ledit revêtement peut modifier la direction d'écoulement du fluide qui est parallèle à un axe central géométrique du conduit d'écoulement et diviser le fluide en une pluralité de courants secondaires qui forment entre eux un angle donné. Les courants secondaires s'écoulent de manière centripète en direction des deux côtés d'un plan symétrique longitudinal et se percutent les uns les autres ou frappent la paroi extérieure du revêtement de guidage de fluide suivant. Ces courants secondaires peuvent également s'écouler de manière centrifuge et s'éloigner des deux côtés d'un plan symétrique longitudinal et frapper la paroi intérieure du revêtement de guidage de fluide suivant du conduit d'écoulement.
PCT/CN2002/000040 2001-01-28 2002-01-24 Procede de reduction de la pression et de l'energie pulsatoire d'un fluide haute pression dans un conduit d'ecoulement et dispositif associe WO2002059522A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 01102789 CN1368594A (zh) 2001-01-28 2001-01-28 流道内使高压流体降压和衰减流体脉动动能的方法及装置
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CN114194354A (zh) * 2021-12-10 2022-03-18 海鹰企业集团有限责任公司 一种具有降噪功能的仿生型导流罩设计方法

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CN103256447B (zh) * 2013-06-06 2015-04-01 兰州理工大学 一种管道降压装置
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CN104006260B (zh) * 2014-06-09 2016-02-24 江苏业安环保设备科技有限公司 水管路稳流宽频带消声器
CN104913148B (zh) * 2015-04-22 2017-06-16 苏州纽威阀门股份有限公司 一种多级降噪器以及具有该降噪器的阀门
CN105443909A (zh) * 2015-12-03 2016-03-30 重庆互通管道技术设备有限公司 减振弯管
US10208880B2 (en) * 2016-12-30 2019-02-19 Emerson Process Management Regulator Technologies, Inc. Noise attenuators for use with process control devices
CN107631120A (zh) * 2017-10-30 2018-01-26 蚌埠新奥能源发展有限公司 一种燃气管消音装置
CN108331991A (zh) * 2018-03-26 2018-07-27 连云港宇泰电力设备有限公司 组合式蒸汽排放消音器
CN114992419B (zh) * 2022-05-31 2023-09-05 中国船舶重工集团公司第七一九研究所 蒸汽减压降温装置

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CN114194354B (zh) * 2021-12-10 2024-01-23 海鹰企业集团有限责任公司 一种具有降噪功能的仿生型导流罩设计方法

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