CN1318710C

CN1318710C - Double layer acoustic liner and fluid pressurizing device and method utilizing same

Info

Publication number: CN1318710C
Application number: CNB01822797XA
Authority: CN
Inventors: Z·刘
Original assignee: Dresser Rand Co
Current assignee: Dresser Rand Co
Priority date: 2000-12-21
Filing date: 2001-11-08
Publication date: 2007-05-30
Anticipated expiration: 2021-11-08
Also published as: DE60120769T2; CA2432094C; DE60120769D1; JP4088155B2; EP1356169A4; CA2432094A1; EP1356169B1; WO2002052110A1; CN1489662A; JP2004525290A; DE01996188T1; EP1356169A1

Abstract

This invention relates to a double layer acoustic liner for attenuating noise and consisting of a plurality of cells formed in a plate in a manner to form an array of resonators, and a fluid processing device and method incorporating same.

Description

The fluid pressurized device

Related application that can be for reference

The application be on December 21st, 2000 propose do not examine and revise patent application S.N.09/745,862 subsequent application.

Technical field

The fluid pressurized apparatus and method that the present invention relates to a kind of acoustic lining of bilayer and use described liner.

Background technology

Fluid pressurized device (such as centrifugal compressor) is widely used in the different industries of various application of the compression that relates to gas or supercharging.Yet typical compressor produces higher noise level, and there is significantly harm in described noise for installing near people.Described noise also can cause vibrations and structural failure.

For example, main noise source results from the position of impeller outlet and diffuser inlet usually in the centrifugal compressor, and this is because fluid passes the high-speed of these zones and causes.Be placed in the diffuser when recovering with pressure when discharging blade, it is higher that the noise rank can become, and this is owing to the aerodynamic reciprocation between impeller and the diffuser vane causes.

People have used other than high noise level that various external noise control measure (such as covering and packing) reduce that compressor and similar device produce.These external noises reduce technology may be quite expensive, and especially they make later addition product as this device usually.

In addition, developed the interior arrangement that is generally the acoustic lining form, described interior arrangement is arranged in compressor and the similar device, so that the noise of control gas flow path inside.These liners are normally based on known Helmholtz resonator principle, according to described Helmholtz resonator principle, when sound wave during by the vibration of the hole in the liner, the liner acoustic energy that dissipated, and because the local impedance mismatch that liner caused and reflection of the acoustic energy upstream.In United States Patent(USP) Nos. 4,100,993; 4,135,603; 4,150,732; 4,189,027; 4,443,751; 4,944,362; And the example that has disclosed Helmholtz resonator in 5,624,518.

Typical Helmholtz system acoustic lining is three sandwich forms, and described three sandwiches are made up of the honeycomb unit that is held between perforated panel and the back plate.Although these three-chip type designs successfully have been applicable to the noise aspect that suppresses in the aero-engine, can't affirm whether these three-chip type designs can be applicable in the fluid pressurized device (such as centrifugal compressor).This mainly be since the extreme operating condition of compressor (such as, in the quick step-down process that the compressor emergency cut-off is caused) under, the perforated panel of liner may have been interrupted bonding the causing between itself and the honeycomb structure.Perforated panel can fluff in this case, this can make that not only acoustic lining no longer plays a role, but also can cause excessive air force to run off, even can occur because the possibility of the bust of the potential machinery that collision caused between the perforated sheet of avalanche and the rotary blade.

Therefore need a kind of system and method that be used for reducing the noise of fluid pressurized device, described system and method uses Helmholtz system acoustic lining, has eliminated its shortcoming simultaneously.

Summary of the invention

Therefore the invention provides a kind of fluid pressurized device, described fluid pressurized device comprises: shell has inlet, exports and limit a plurality of walls in chamber between entry and exit; Impeller, described impeller are installed in the described chamber and are suitable for rotation and pass described chamber to exporting so that discharge so that fluid flows from entering the mouth from shell; First plate one of is installed in the described a plurality of walls that limit described chamber, and has a plurality of surfaces from this plate and extend to another surperficial through hole; A described wall covers an end of described a plurality of through holes; With second plate, be installed on described first plate, and have a plurality of surfaces and extend to another surperficial through hole from second plate; The acoustic energy that described through hole is decayed and produced in the described chamber.

In fluid pressurized device of the present invention, the extension of the through hole of described second plate is alignd with the through hole of described first plate.

In fluid pressurized device of the present invention, the through hole on described first plate comprises that from one of described first plate surface a plurality of holes of extending, being covered by a described wall and a plurality of opposed surface from described plate extend to the hole in each hole.

In fluid pressurized device of the present invention, the through hole on described second plate comprises that a plurality of holes of extending from one of described second plate surface and a plurality of opposed surface from described plate extend to the hole in each hole.

In fluid pressurized device of the present invention, align with the hole of described first plate in the hole on described second plate.

In fluid pressurized device of the present invention, the diameter in described hole is less than the diameter in described hole.

In fluid pressurized device of the present invention, described through hole is even extremely to be distributed on each plate.

In fluid pressurized device of the present invention, the described number of openings of each plate and size are selected to the main noise component of tuning described plate with the described acoustic energy of decaying.

In fluid pressurized device of the present invention, a described wall of surface butt joint of described first plate.

In fluid pressurized device of the present invention, described impeller has the flow channel of a plurality of and described chamber fluid flow communication, makes described fluid flow through described road.

In fluid pressurized device of the present invention, described chamber comprise a zone that holds described impeller and with the diffusion channel of this regional connectivity, wherein said first plate is installed on the wall that limits described diffusion channel, and described fluid flow to described diffusion channel from described zone.

In fluid pressurized device of the present invention, also comprise the 3rd plate, be installed on another wall that extends back to described wall, and have a plurality of surfaces and extend to another surperficial through hole from described the 3rd plate; Described another wall covers an end of described the 3rd plate through hole, with the acoustic energy that is produced in the described chamber of further decay.

In fluid pressurized device of the present invention, also comprise the 4th plate, be installed on described the 3rd plate, and have a plurality of surfaces and extend to another surperficial through hole, with the described acoustic energy of further decay from described the 4th plate.

In fluid pressurized device of the present invention, the extension of the through hole of described the 4th plate is alignd with the through hole of described the 3rd plate.

In fluid pressurized device of the present invention, the through hole of described the 3rd plate and the 4th plate comprises that a plurality of holes of extending from one of each plate surface and a plurality of opposed surface from each plate extend to the hole in each described hole.

In fluid pressurized device of the present invention, align with the hole of described the 3rd plate in the hole of described the 4th plate.

In fluid pressurized device of the present invention, the diameter in the hole of described the 3rd plate and the 4th plate is less than the diameter in the hole of described the 3rd plate and the 4th plate.

In fluid pressurized device of the present invention, comprise that further one is connected to the pipeline of described inlet and is formed on the 3rd plate on the described inner-walls of duct, described the 3rd plate has a plurality of surfaces from described the 3rd plate and extends to another surperficial respective through hole; The end that described inner-walls of duct covers described hole forms the resonator array of an attenuator array with the acoustic energy that produces in the described pipeline of decaying.

In fluid pressurized device of the present invention, also comprise the 4th plate, be installed on described the 3rd plate, and have a plurality of surfaces and extend to another surperficial through hole, with the acoustic energy that is produced in the described chamber of further decay from described the 4th plate.

In fluid pressurized device of the present invention, the through hole on described the 3rd plate and the 4th plate comprises that a plurality of holes of extending from one of each plate surface and a plurality of opposed surface from each plate extend to the hole in each described hole.

In fluid pressurized device of the present invention, described the 3rd plate and the 4th plate are subjected to crooked to meet described side opposite.

Description of drawings

Fig. 1 is the cross-sectional view of a part that includes the gas pressurized device of the related a pair of acoustic lining of one embodiment of the invention;

Fig. 2 is the amplification cross-sectional view of an acoustic lining among Fig. 1;

Fig. 3 is the amplification front elevation of the part of Fig. 2 liner; With

Fig. 4 is the view similar to Fig. 1 with Fig. 5, but shows the auxiliary acoustic lining that is arranged in other positions in the fluid pressurized device.

The specific embodiment

Fig. 1 shows the part of high-pressure fluid supercharging device (such as centrifugal compressor), and described device comprises shell 10, and described shell 10 defines the impeller cavity 10a that is used to receive impeller 12, installs described impeller 12 to such an extent that can rotate in described impeller cavity.It should be understood that the power transmission shaft (not shown) makes impeller 12 rotate under high speed, fully velocity pressure is delivered to the gas place that is inhaled in the compressor via inlet.

Impeller 12 comprises in axisymmetric mode and is arranged in the axial a plurality of impeller blade 12a in back, described back over glaze is used for gas is discharged to diffuser passage or raceway groove 14, and described diffuser passage or raceway groove 14 radially outward are formed in the shell 10 from chamber 10a and impeller 12.Raceway groove 14 received the high-pressure fluid that comes from impeller 12 before high-pressure fluid is sent to spiral case or gatherer 16.Diffuser raceway groove 14 is used for the velocity pressure of gas is changed into static pressure, and described diffuser raceway groove 14 links to each other with discharging spiral case or gatherer 16, and described discharging spiral case or gatherer 16 also are formed in the shell and with described pipeline and are connected.Though not shown in Fig. 1, it should be understood that discharging spiral case 16 makes air under pressure be connected with the outlet of compressor.

Because the centrifugal action of impeller blade 12a can be compressed to gas under the higher pressure.Compressor also is equipped with the pad bearing of conventional labyrinth seal, thrust bearing, inclination and other conventional equipment for such compressor.Because this structure is conventional, therefore this structure will be shown no longer or it will be explained in more detail.Installation bracket 20 is fastened onto on the inwall of the shell 10 that defines diffuser raceway groove 14, and described installation bracket 20 comprises substrate 22 and plate 24, described substrate 22 is adjacent to the outer end portion of impeller and arranges, the rear wall of described plate 24 from described bases along shell extends.

The annular acoustic lining 28 of two all-in-one-piece, single-pieces and 30 is installed in the groove in the plate 24 of carriage 20 in the mode that leans, and each described

liner

28 and 30 shape all are annular, and extend round impeller 12 360 degree.At length show the upper part of liner 28 in Fig. 2 and Fig. 3, and liner 28 is made of annular, thicker, whole housing or plate 32, described housing or plate 32 preferably are made of a steel.Can any traditional mode (such as with a plurality of bolts or the like) plate 32 is invested on the carrier frame plate 24.

A surface passing plate 32 is formed with many bigger unit or opening 34, and but described unit or opening 34 pass the big half thickness of described plate do not pass its whole thickness.Many smaller units 36 extend to the apparent surface of plate 32 from the bottom of each unit 34.For exemplary purposes, each unit 34 shown in the figure all has discoid cross section, and each unit 36 all is the boring form, but it should be understood that the shape of

unit

34 and 36 can change in protection scope of the present invention.

According to one embodiment of the present of invention, each unit 34 an all surface by plate 32 gets out larger-diameter countersunk and forms, and but described countersunk passes the big half thickness of described plate do not pass its whole thickness.Each unit 36 all another surface by plate 32 gets out boring up to the bottom of corresponding unit 34 or path forms, thereby makes unit 34 be connected with diffuser raceway groove 14.

As shown in Figure 3, unit 34 is to form in the mode of extending row along a plurality of annulars in the full annular zone of plate 32, wherein each row's unit 34 and its adjacent row's unit 34 interlaced or biasings.A plurality of unit 36 interrelate with each unit 34, can perhaps, can form unit 36 with equally distributed any pattern with respect to its units corresponding 34 arrangement unit 36 optionally.

With reference to Fig. 1, liner 30 is similar to liner 28, and similarly, liner 30 also is made of annular, thicker, whole housing or plate 42 (Fig. 1), described housing or plate 42 preferably are made of a steel, and in any traditional mode (such as with a plurality of bolts or the like) liner 30 are invested on the liner 28.A surface passing plate 42 is formed with many bigger unit or opening 44, and many smaller units 46 extend to the apparent surface of plate 32 from the bottom of each unit 34.Because unit 44 is similar with 36 to unit 34 respectively with 46, therefore will no longer be further described it.Though also not shown in the drawings, it should be understood that liner 30 can have different thickness with 28.

Liner

28 and 30 is installed on the carrier frame plate 24, and wherein the surface of the liner 28 that passes therethrough of unit 34 and the surface of the liner 30 that unit 46 passes therethrough lean.Equally, the unit 34 of liner 28 aligns with the unit 44 of liner 30.The openend of the unit 44 of liner 30 is covered by the lower wall of the plate 24 of carriage 20, and the openend of the unit 34 of liner 28 is covered by the respective surfaces of liner 30.Because the unit 34 of liner 28 is that the therefore unit 46 of liner 30 that aligns mutually makes the unit 34 of liner 28 and the unit 44 of liner 30 interconnect with the unit 44 of liner 30.

Because between the

liner

28 and 30 and firm contact the between the respective wall of liner 30 and the plate 24 of carriage 20, and because

unit

36 and 46 makes unit 34 be connected with diffuser raceway groove 14 with 44, therefore jointly work as the resonator of one group of series connection in described unit.Thereby

liner

28 and 30 has been decayed in shell 10 because the fast rotational of impeller 12 and by the sound wave that its associated component produced, and the noise possibility walking around liner and pass another paths of having eliminated (or minimizing at least).

And, can reduce the main noise component that under blade passing frequency or higher frequency, occurs usually effectively by adjusting

liner

28 and 30, so that the latter,, maximum sound attenuation appears around the higher frequency that is.Can realize this point by the volume of

change unit

34 and 44 and/or cross-sectional area, quantity and/or its length of unit 36 and 46.If provide two liners 28 to compare with the situation of only using a liner with 30, they can be in noise attenuation in the frequency range widely, thereby can realize that the decay of peak discharge ground is by the impeller 12 of rotation and the acoustic energy that associated component produced thereof.

According to the embodiment of Fig. 4, two ring liners 48 all-in-one-piece, single-piece are fastened onto in the groove that is formed in shell 10 inwalls in the mode relative with

liner

28 and 30 with 50.Liner 48 extends in the bottom of groove and is connected with the structure that constitutes described groove in any traditional mode (such as with a plurality of bolts or the like); Liner 50 is to extend in groove with the mode that liner 48 leans and to be connected with liner 48 in any traditional mode (such as with a plurality of bolts or the like).Liner 50 partly limits diffuser raceway groove 14 with liner 30.Because liner 48 is identical with

liner

28 and 30 with 50 and serve the same role, so will it not done any further description.

Because between the

liner

48 and 50 and firm contact the between the respective wall of liner 48 and shell 10, and because the layout of each unit of liner, so jointly work as one group of resonator of connecting in described unit.Thereby

liner

48 and 50 has been decayed in shell 10 because the fast rotational of impeller 12 and by the sound wave that its associated component produced, and the noise possibility walking around liner and pass another paths of having eliminated (or minimizing at least).

liner

48 and 50, so that the latter,, maximum sound attenuation appears around the higher frequency that is.Can realize this point by volume and/or cross-sectional area, quantity and/or its length that changes their each unit.If provide two liners 48 to compare with the situation of only using a liner with 50, they can be in noise attenuation in the frequency range widely, thereby can realize that the decay of peak discharge ground is by the impeller 12 of rotation and the acoustic energy that associated component produced thereof.

In addition, in the groove of

ring liner

54 and 56 in being formed at shell 10 of two all-in-one-piece, single-pieces, be installed to the rear portion of impeller 12.Liner 54 extends in the bottom of groove and is connected with the structure that constitutes described groove in any traditional mode (such as with a plurality of bolts or the like); Liner 56 is to extend in groove with the mode that liner 54 leans and to be connected with liner 54 in any traditional mode (such as with a plurality of bolts or the like).Liner 56 limits the chamber that impeller 12 rotates therein with liner 52.

Liner 54 and 56 external diameter are less than the external diameter of

liner

28,30,48 and 50, but other aspects are identical with

liner

28,30,48 and 50, and are mounted in the mode identical with

liner

28,30,48 and 50.

Because between the

liner

54 and 56 and firm contact the between the respective wall of liner 54 and shell 10, and owing to the layout of each unit of liner, so jointly work as one group of continuous resonator in described unit.Thereby

liner

54 and 56 has been decayed in shell 10 because the fast rotational of impeller 12 and by the sound wave that its associated component produced, and the noise possibility walking around liner and pass another paths of having eliminated (or minimizing at least).

liner

54 and 56, so that the latter,, maximum sound attenuation appears around the higher frequency that is.Can realize this point by volume and/or cross-sectional area, quantity and/or its length that changes their each unit.If provide two liners 54 to compare with the situation of only using a liner with 56, they can be in noise attenuation in the frequency range widely, thereby can realize that the decay of peak discharge ground is by the impeller 12 of rotation and the acoustic energy that associated component produced thereof.

Also show the another kind of preferred arrangements of liner in Fig. 5, wherein show inlet duct 60, described inlet duct 60 is incorporated into gas in the inlet of impeller 12.As shown in Figure 5, extend above the center line C/L of pipeline and shell 10 on the top that wherein shows pipeline 60.

Liner 64 all-in-one-piece, single-piece is inlaid on the inwall of pipeline 60, wherein shows its radially outer.Liner 64 is crooked housing forms, and it is cylindric or conical that its shape is preferably, and described liner 64 is arranged in the annular groove that is formed in pipeline 60 inner surfaces, and is fastened onto in the groove in any known mode.Because liner 64 is similar with 56 to

liner

28,30,48,50,52,54 in other respects, therefore will no longer further describe it.

Liner 66 all-in-one-piece, single-piece also is arranged in the annular groove of back, and described liner 66 extends around liner 64 in the mode that the external surface of its inner surface and liner 64 leans.Liner 66 is crooked housing forms, and it is cylindric or conical that its shape is preferably, and its diameter is greater than the diameter of liner 64, and is fastened onto liner 64 in any known mode (such as with a plurality of bolts or the like).Because liner 64 is similar with 56 to

liner

28,30,48,50,52,54 in other respects with 66, and plays a role in an identical manner with the noise in the obvious reduction shell 10, therefore will no longer further describe it.

Since between the liner 64 and 66 and liner 66 and shell 10 define firm contact the between the respective wall of back groove, and because the layout of each unit of liner, with they positions with respect to inlet duct 60, therefore jointly work as the resonator of one group of series connection in described unit.Thereby liner 64 and 66 has been decayed in shell 10 because the fast rotational of impeller 12 and by the sound wave that its associated component produced, and the noise possibility walking around liner and pass another paths of having eliminated (or minimizing at least).

And, can reduce the main noise component that under blade passing frequency or higher frequency, occurs usually effectively by adjusting liner 64 and 66, so that the latter,, maximum sound attenuation appears around the higher frequency that is.Can realize this point by volume and/or cross-sectional area, quantity and/or its length that changes their each unit.If provide two liners 64 to compare with the situation of only using a liner with 66, they can be in noise attenuation in the frequency range widely, thereby can realize that the decay of peak discharge ground is by the impeller 12 of rotation and the acoustic energy that associated component produced thereof.

In addition, this fact that the frequency of the main noise component in the fluid pressurized device of known the above-mentioned type can change along with compressor speed, each can this pad of upper edge, space than the less unit number of big unit be varied to and makes decay the effectively noise of bigger frequency band of whole pad in each liner.Therefore, not only in the constant speed machine, and in variable speed compressor or gaseous fluid supercharging device,

liner

28,30,48,50,52,54,56,64 and 66 all can be efficiently noise attenuation effectively.

Except acoustic energy attenuation and elimination back energy pass from bypass as mentioned above, to compare with modular design recited above, the structure of the monolithic of liner, single-piece makes liner more firm in mechanical aspects in the foregoing description.Therefore, liner provides adamantine inwall for the internal flow in the fluid pressurized device, and less deformed or distortion hardly when being subjected to mechanical load and heat requirement, even in the time of therefore in it being installed in narrow gap (such as diffuser raceway groove or the like), described liner is not having harmful effect yet aspect the aerodynamic quality of fluid pressurized device (such as centrifugal compressor).

Modification

The concrete layout and the quantity of the liner that the foregoing description is related are not limited to shown quantity.Therefore, can be with any side of gasket arrangement at diffuser raceway groove and/or impeller and/or inlet duct.

Can be different from above-mentioned technology in order to the concrete technology that constitutes unit in the liner.For example, can constitute such monolithic liner, wherein the unit is molded in their plates separately.

The relative size of the unit of each liner, shape, quantity and pattern can change.

Liner is not limited to centrifugal compressor and is used in combination, and equally applicable to other fluid pressurized device, described fluid pressurized device passes through movably blade realization aerodynamic effect.

As mentioned above, each liner all can extend to a certain degree around the axis of impeller and inlet duct; Perhaps each liner can be made for several parts, described several parts are extended the angular distance less than 360 degree.

Above employed space reference, such as " bottom ", " inside ", " outside ", " sidepiece " or the like, all only be for illustrative purposes, rather than the concrete orientation or the position of limiting structure.

Owing in aforementioned disclosure, can comprise other correction, change and replacement, it should be understood that therefore that appended claim should be explained more widely and consistent with protection scope of the present invention.

Claims

1. fluid pressurized device, described fluid pressurized device comprises:

Shell has inlet, outlet and limit a plurality of walls in chamber between entry and exit;

Impeller, described impeller are installed in the described chamber and are suitable for rotation and pass described chamber to exporting so that discharge so that fluid flows from entering the mouth from shell;

First plate one of is installed in the described a plurality of walls that limit described chamber, and has a plurality of surfaces from this plate and extend to another surperficial through hole; A described wall covers an end of described a plurality of through holes; With

Second plate is installed on described first plate, and has a plurality of surfaces from second plate and extend to another surperficial through hole;

The acoustic energy that described through hole is decayed and produced in the described chamber.

2. the fluid pressurized device described in claim 1 is characterized in that, the through hole extension of described second plate is alignd with the through hole of described first plate.

3. the fluid pressurized device described in claim 1, it is characterized in that, through hole on described first plate comprises that from one of described first plate surface a plurality of holes of extending, being covered by a described wall and a plurality of opposed surface from described plate extend to the hole in each hole.

4. the fluid pressurized device described in claim 3 is characterized in that, the through hole on described second plate comprises that a plurality of holes of extending from one of described second plate surface and a plurality of opposed surface from described plate extend to the hole in each hole.

5. the fluid pressurized device described in claim 4 is characterized in that, aligns with the hole of described first plate in the hole on described second plate.

6. the fluid pressurized device described in claim 4 is characterized in that, the diameter in described hole is less than the diameter in described hole.

7. the fluid pressurized device described in claim 1 is characterized in that, described through hole is even extremely to be distributed on each plate.

8. the fluid pressurized device described in claim 1 is characterized in that, the described number of openings of each plate and size are selected to the main noise component of tuning described plate with the described acoustic energy of decaying.

9. the fluid pressurized device described in claim 1 is characterized in that, a described wall of surface butt joint of described first plate.

10. the fluid pressurized device described in claim 1 is characterized in that, described impeller has the flow channel of a plurality of and described chamber fluid flow communication, makes described fluid flow through described road.

11. the fluid pressurized device described in claim 1, it is characterized in that, described chamber comprise a zone that holds described impeller and with the diffusion channel of this regional connectivity, wherein said first plate is installed on the wall that limits described diffusion channel, and described fluid flow to described diffusion channel from described zone.

12. the fluid pressurized device described in claim 1 also comprises the 3rd plate, is installed on another wall that extends back to described wall, and has a plurality of surfaces from described the 3rd plate and extend to another surperficial through hole; Described another wall covers an end of described the 3rd plate through hole, with the acoustic energy that is produced in the described chamber of further decay.

13. the fluid pressurized device described in claim 12 also comprises the 4th plate, is installed on described the 3rd plate, and has a plurality of surfaces from described the 4th plate and extend to another surperficial through hole, with the described acoustic energy of further decay.

14. the fluid pressurized device described in claim 13 is characterized in that, the through hole extension of described the 4th plate is alignd with the through hole of described the 3rd plate.

15. the fluid pressurized device described in claim 13 is characterized in that, the through hole of described the 3rd plate and the 4th plate comprises that a plurality of holes of extending from one of each plate surface and a plurality of opposed surface from each plate extend to the hole in each described hole.

16. the fluid pressurized device described in claim 15 is characterized in that, align with the hole of described the 3rd plate in the hole of described the 4th plate.

17. the fluid pressurized device described in claim 15 is characterized in that, the diameter in the hole of described the 3rd plate and the 4th plate is less than the diameter in the hole of described the 3rd plate and the 4th plate.

18. the fluid pressurized device described in claim 1, further comprise a pipeline that is connected to described inlet, with the 3rd plate that is formed on the described inner-walls of duct, described the 3rd plate has a plurality of surfaces from described the 3rd plate and extends to another surperficial respective through hole; The end that described inner-walls of duct covers described hole forms the resonator array of an attenuator array with the acoustic energy that produces in the described pipeline of decaying.

19. the fluid pressurized device described in claim 18 also comprises the 4th plate, is installed on described the 3rd plate, and has a plurality of surfaces from described the 4th plate and extend to another surperficial through hole, with the acoustic energy that is produced in the described chamber of further decay.

20. the fluid pressurized device described in claim 19 is characterized in that, the through hole extension of described the 4th plate is alignd with the through hole of described the 3rd plate.

21. the fluid pressurized device described in claim 19 is characterized in that, the through hole on described the 3rd plate and the 4th plate comprises that a plurality of holes of extending from one of each plate surface and a plurality of opposed surface from each plate extend to the hole in each described hole.

22. the fluid pressurized device described in claim 21 is characterized in that, align with the hole of described the 3rd plate in the hole of described the 4th plate.

23. the fluid pressurized device described in claim 21 is characterized in that, the diameter in the hole of described the 3rd plate and the 4th plate is less than the diameter in the hole of described the 3rd plate and the 4th plate.

24. the fluid pressurized device described in claim 18 is characterized in that, described the 3rd plate and the 4th plate are subjected to crooked to meet described side opposite.