CN114412613B - Resistant muffler and ship - Google Patents

Abstract

The application provides a resistant muffler and a ship, wherein the resistant muffler comprises a shell, a muffler pipeline, a first partition plate, a micro-perforated pipe, a first guide pipe and a first spraying part, wherein the muffler pipeline is penetrated into the shell along the axial direction of the muffler pipeline, and a cooling cavity is formed by the outer wall of the muffler pipeline and the inner wall of the shell; the silencing pipeline comprises an air inlet pipe and an air outlet pipe; the first baffle plate is arranged in the silencing pipeline and divides the interior of the silencing pipeline into a primary silencing cavity and a secondary silencing cavity; the air inlet pipe is communicated with the primary silencing cavity, and the air outlet pipe is communicated with the secondary silencing cavity; the micro-perforated pipe is axially arranged in the secondary silencing cavity and one end of the micro-perforated pipe is connected to the first partition board; the micro-perforated pipe is provided with micropores; the first conduit is arranged in the primary sound-absorbing cavity and comprises an outer wall and an inner wall, a gap exists between the outer wall and the inner wall, and the gap is communicated to the air inlet pipe; the cross-sectional area of the first conduit increases in a direction away from the intake pipe; the first spraying part extends into the primary silencing cavity, so that noise and infrared radiation are simultaneously inhibited.

Description

Resistant muffler and ship

Technical Field

The application relates to the technical field of noise elimination, in particular to a resistance muffler and a ship.

Background

The turbocharged diesel engine is one of the main motive power devices of the ship, and meanwhile, exhaust noise and high-temperature exhaust of the turbocharged diesel engine are also one of main noise sources and infrared radiation signals of the related ship. With the development of technology, the present requirements for the concealment of ships are not only to reduce noise radiation, but also to reduce high-temperature infrared radiation of ships.

In order to continuously improve the comprehensive concealment of ships, the high noise and high-temperature exhaust of diesel engines need to be suppressed. At present, an exhaust cooling and silencing device is installed in an exhaust system of a marine diesel engine and is used for controlling exhaust noise with low full-frequency characteristics, and a cooling mode adopted by the exhaust cooling and silencing device comprises two modes of heat conduction and heat exchange of a cooling water jacket and direct water spray cooling.

The existing exhaust cooling and silencing technology adopts a composite silencing structure to achieve a better silencing effect, and because the sound absorption performance of the material is drastically reduced due to the fact that the sound absorption material absorbs water, the structure basically adopts a heat conduction mode to cool and exchange heat to reduce high-temperature exhaust, and finally results in poor exhaust cooling effect, so that the high infrared suppression requirement of modern ships cannot be met. The other is to adopt the water spray cooling method in order to achieve better cooling effect, on one hand, the existing structure can not fully mix hot exhaust and water mist in the whole cavity, so that the temperature of a local area is reduced, on the other hand, the water mist can fully fill the cavity, and on the other hand, the pure resistance structure can only be adopted for silencing, so that the high-frequency silencing effect is poor finally, and the high noise suppression requirement of modern ships can not be met.

Disclosure of Invention

The application provides a resistance muffler and ship to solve when the comprehensive stealth of boats and ships, unable high-efficient noise and the technical problem of infrared radiation of restraining simultaneously.

The application provides a resistance muffler which comprises a shell, a muffler pipeline, a first partition plate, a micro-perforated pipe, a conical first guide pipe and a first spraying part, wherein the muffler pipeline is axially penetrated into the shell, and a cooling cavity is formed by the outer wall of the muffler pipeline and the inner wall of the shell; the silencing pipeline comprises an air inlet pipe and an air outlet pipe, and one end of the air inlet pipe and one end of the air outlet pipe extend out of the shell; the first baffle is arranged in the silencing pipeline along the radial direction of the silencing pipeline, and the side wall of the first baffle is connected to the inner wall of the silencing pipeline to divide the interior of the silencing pipeline into a primary silencing cavity and a secondary silencing cavity; the air inlet pipe is communicated with the primary silencing cavity, and the air outlet pipe is communicated with the secondary silencing cavity; the micro-perforated pipe is axially arranged in the secondary silencing cavity and one end of the micro-perforated pipe is connected to the first partition plate; the micro-perforated pipe is provided with at least two micropores, and the micropores are distributed along the axial direction and the circumferential direction of the micro-perforated pipe; the first conduit is axially arranged in the primary silencing cavity and comprises an outer wall and an inner wall, a gap exists between the outer wall and the inner wall, and the gap is communicated to the air inlet pipe; the cross-sectional area of the first conduit increases in a direction away from the air intake pipe; the first spraying part stretches into the primary silencing cavity to spray water.

Optionally, the resistive muffler further includes a second partition plate, the second partition plate is disposed in the secondary silencing cavity along a radial direction of the silencing pipeline, and a side wall of the second partition plate is connected to an inner wall of the silencing pipeline to divide the secondary silencing cavity into a secondary silencing cavity and a tertiary silencing cavity; the micro-perforated pipe is arranged in the secondary silencing cavity, one end of the micro-perforated pipe is connected to the first partition board, and the other end of the micro-perforated pipe is connected to the second partition board and communicated to the tertiary silencing cavity.

Optionally, the resistive muffler further includes at least one second conduit connected to the second partition, one end of the second conduit being connected to the secondary damping chamber, and the other end being connected to the tertiary damping chamber; one end of the second conduit is a bent pipe section, and the bent pipe section is positioned in the three-stage sound-absorbing cavity and bends towards the axial direction far away from the micro-perforated pipe.

Optionally, when the resistive muffler includes more than two of the second conduits, the second conduits encircle an axial circumferential array of the micro-perforated pipes.

Optionally, the resistive muffler further comprises a second spraying part, and the second spraying part stretches into the three-stage silencing cavity to spray water.

Optionally, the resistive muffler further includes an insertion tube connected to the first separator along an axial direction of the micro-perforated tube, one end of the insertion tube is connected to the secondary sound-damping cavity, and the other end of the insertion tube is connected to the primary sound-damping cavity.

Optionally, the first conduit further includes more than two guide plates, the guide plates are disposed in the gap, and two side surfaces of the guide plates are respectively connected to the outer wall and the inner wall; each guide plate is arranged along the direction of a bus of the first conduit so as to separate the gap; the guide plate comprises a first section and a second section, the first section extends from the center of the first conduit to the axial direction of the first conduit, and the second section extends from the end of the first section along the direction of a bus of the first conduit; the length of the first section is L, and the pipe diameter of the air inlet pipe is D, and L=D/2.

Optionally, the second section is curved; the first conduit comprises an air inlet end and an air outlet end, the air inlet end is communicated to the air inlet pipe, the cross section area of the air inlet end is S1, the cross section area of the air outlet end is S2, and then S1=S2/2.

Optionally, the resistive muffler further includes a third conduit, the third conduit is arranged on the second partition plate in a penetrating manner along an axial direction of the micro-perforated pipe, one end of the third conduit is a conical end, the conical end extends into and is communicated with the three-level silencing cavity, and the other end of the third conduit is communicated with the micro-perforated pipe.

Alternatively, when the resistive muffler includes two or more of the second conduits, the lengths of the second conduits are the same only at equal axial distances from the micro-perforated pipe.

Optionally, the resistive muffler further comprises at least one hydrophobic port, the hydrophobic port being communicated to the interior of the muffling conduit.

Optionally, the resistive muffler further includes a spiral plate disposed in the cooling cavity along an axial direction of the muffling pipe.

Optionally, a water inlet and a water outlet which are communicated with the cooling cavity are formed in the shell; the water inlet and the air inlet pipe are positioned at the same end of the shell, and the water outlet and the air outlet pipe are positioned at the other opposite end of the shell.

Accordingly, the present application also provides a ship comprising a resistant muffler, which is a resistant muffler as described in any one of the above.

The application provides a resistant muffler and a ship, wherein gas enters a conical first conduit through an air inlet pipe and flows in the first conduit along a gap between an outer wall and an inner wall; as the cross-sectional area of the first conduit is gradually increased along the direction away from the air inlet pipe, and the expansion of the cross-sectional area of the primary sound-damping cavity causes the reflection of sound waves, the sound-damping effect of middle and low frequency band noise is achieved. The side wall of the micro-perforated pipe is provided with a plurality of micropores, so that a resonance sound absorption structure with low sound quality and high sound resistance is formed, sound waves enter the micro-perforated pipe and are reflected back and forth in the cavity to realize noise elimination, the micro-perforated pipe reduces noise by utilizing friction loss of air in the micropores, and meanwhile, the micro-perforated pipe is matched with the contraction and expansion of the cross section area of the secondary sound absorption cavity to effectively absorb high-frequency noise; the resistance muffler can absorb noise in the full frequency band, so that the noise elimination effect in the full frequency band is improved.

The cooling water enters the cooling cavity formed by the shell and the silencing pipeline, and can exchange heat between the high-temperature wall surfaces of the primary silencing cavity and the secondary silencing cavity, so that the temperature of gas in the silencing pipeline is reduced. The width of the gap between the outer wall and the inner wall is smaller than the pipe diameter of the air inlet pipe, so that when high-temperature air flows to the first conduit through the air inlet pipe, the air flowing through the gap and entering the silencing cavity can form stronger air flow disturbance. And the cross section area of the first conduit at the air outlet end is the largest, so that when the air enters the primary silencing cavity through the air outlet end, the air forms a sharp cyclone vortex; the cyclone vortex is fully mixed with the water mist sprayed by the first spraying part, so that the cooling effect of gas can be improved.

The application provides a resistant muffler and ship, and the beneficial effect of its another improvement scheme:

the cooled high-temperature exhaust enters the three-stage silencing cavity through the second conduit and the third conduit, and due to the characteristic of different lengths of the second conduit, each cross section of the three-stage silencing cavity forms vortex along the axial direction, so that a three-dimensional multi-cyclone space is formed in the cavity, hot exhaust and gasified water mist are fully mixed, water vapor in the three-stage silencing cavity reaches a saturated state and is uniformly distributed, and a temperature field in the cavity is relatively uniform and does not have local high temperature.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of a resistive muffler provided herein;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

FIG. 3 is a perspective view of the resistive muffler provided herein;

FIG. 4 is a schematic view of an air inlet pipe and a first conduit provided herein;

FIG. 5 is a schematic view of a portion of the structure of a first conduit provided herein;

FIG. 6 is a schematic view of a second conduit provided herein;

fig. 7 is a schematic view of a hydrophobic tube provided herein.

Reference numerals illustrate:

100. a housing; 200. a sound damping pipe; 210. an air inlet pipe; 220. an air outlet pipe; 230. a primary sound-damping cavity; 240. a secondary sound-damping cavity; 250. a third-stage sound-eliminating cavity; 260. a water drain pipe; 261. a drain port; 300. a cooling chamber; 310. a water inlet; 320. a water outlet; 330. a spiral plate; 340. a first spray section; 350. a second spray section; 400. a micro-perforated tube; 410. micropores; 420. a first separator; 430. a second separator; 440. an insertion tube; 500. a first conduit; 510. an outer wall; 520. an inner wall; 530. a gap; 540. a guide plate; 541. a first section; 542. a second section; 600. a second conduit; 610. bending a pipe section; 700. a third conduit; 710. a tapered end.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which are within the scope of the protection of the present application, will be within the skill of the art without inventive effort. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper", "lower", "left" and "right" are generally used to refer to the directions of the drawings in which the device is actually used or in an operating state.

The present application provides a resistant muffler and a ship, which are described in detail below. It should be noted that the following description order of the embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the descriptions of the embodiments are focused on, and for the part that is not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

Referring to fig. 1-7, the present application provides a resistive muffler, which is a muffler that acoustic waves pass through abrupt parts of a pipe section or bypass a resonant cavity, etc., and causes impedance changes during acoustic propagation to generate reflection and interference of acoustic energy, so as to reduce acoustic energy radiated outwards from the muffler, thereby achieving the purpose of silencing. The resistant muffler can be applicable to high temperature resistance, moisture resistance, in the service environment that convection speed is great, clean requirement is higher, and the resistant muffler is applicable to the ship in this application, installs in turbo supercharged diesel engine specifically, reduces the turbine and increases diesel engine's exhaust noise, reduces the high temperature infrared radiation of boats and ships simultaneously. However, the above-described use environment of the resistive muffler is not particularly limited to the scope of protection of the present application, and the resistive muffler in the present application may be applied to other devices as well.

The resistive muffler includes a housing 100, a muffler pipe 200, a first partition 420, a micro-perforated pipe 400, a first guide pipe 500, and a first spraying part 340, wherein the muffler pipe 200 is penetrated to the inside of the housing 100 along an axial direction thereof, and an outer wall 510 thereof forms a cooling cavity 300 with an inner wall 520 of the housing 100, in this application, in order to maintain assembly accuracy and use stability, a central axis of the muffler pipe 200 coincides with a central axis of the housing 100. The muffling pipe 200 includes an intake pipe 210 and an outlet pipe 220, and one end of the intake pipe 210 and one end of the outlet pipe 220 are both provided with a supercooling chamber 300, and extend out of the housing 100, so that upstream and downstream pipe systems are communicated with the resistive muffler.

The first partition 420 is disposed inside the muffling pipe 200 in the radial direction of the muffling pipe 200, and the sidewall of the first partition 420 is connected to the inner wall of the muffling pipe 200, thereby dividing the inside of the muffling pipe 200 into a primary muffling chamber 230 and a secondary muffling chamber by the first partition 420. Wherein, the air inlet pipe 210 is communicated with the primary sound-eliminating cavity 230, and the air outlet pipe 220 is communicated with the secondary sound-eliminating cavity. The micro-perforated tube 400 is disposed in the secondary anechoic chamber along its axial direction and has one end connected to the first partition 420. The micro-perforated tube 400 is provided with at least two micro-holes 410, and the micro-holes 410 are arranged along the axial direction and the circumferential direction of the micro-perforated tube 400; micropores 410 are throughout the sidewalls of microperforated tube 400 in this application.

The first duct 500 has a tapered shape, and the first duct 500 is disposed inside the primary sound-damping chamber 230 along an axial direction thereof. The first conduit 500 includes an outer wall 510 and an inner wall 520, the outer wall 510 is disposed around the inside, and a gap 530 exists between the outer wall 510 and the inner wall 520, and the gap 530 is connected to the air inlet pipe 210, so that the air in the air inlet pipe 210 flows into the first-stage sound-absorbing cavity 230 through the gap 530. The cross-sectional area of the first duct 500 gradually increases in a direction away from the intake duct 210.

The first spraying part 340 includes a first nozzle, and the first nozzle of the first spraying part 340 extends into the primary silencing cavity 230; further, the other end of the first spray head extends into the cooling chamber 300, so that the first spray part 340 is communicated to the cooling chamber 300. With the first spraying part 340 communicating with the cooling chamber 300, the cooling structure can be simplified.

Exhaust noise of the turbocharged diesel engine enters the tapered first conduit 500 through the air inlet pipe 210, gas flows in the first conduit 500 along the gap 530 between the outer wall 510 and the inner wall 520, and the cross-sectional area of the first conduit 500 gradually increases along the direction away from the air inlet pipe 210, and meanwhile, the contraction and expansion of the cross-sectional area of the primary silencing cavity 230 cause reflection of sound waves, so that the silencing effect of middle and low frequency band noise is achieved. Since the side wall of the micro-perforated pipe 400 is provided with the plurality of micro-holes 410, a resonance sound absorption structure with low sound quality and high sound resistance is formed, in the application, the pipe wall thickness of the micro-perforated pipe 400 is less than 1.0 mm, the aperture of the micro-holes 410 is less than 1.0 mm, the perforation rate is between 1 and 10 percent, and an air layer with a certain thickness (5 to 20 cm) is reserved at the rear part. The sound wave in the primary sound-absorbing cavity 230 flows into the secondary sound-absorbing cavity through the micro-perforated pipe 400, when the sound wave enters the interior of the micro-perforated pipe 400, the micro-perforated pipe 400 reduces noise by using the friction loss of air in the micro-holes 410, the smaller the aperture of the micro-holes 410 is, the larger the sound wave resistance is, the lower the perforation rate is, the sound-absorbing frequency bandwidth can be increased, and meanwhile, the deep cavity degree on the micro-perforated pipe 400 can control the position of an absorption peak. When sound waves enter the micro-perforated tube 400, the shrinkage and expansion of the cross-sectional area of the secondary sound-damping cavity and the plurality of micro-holes 410 formed in the micro-perforated tube 400 are utilized to effectively absorb high-frequency noise.

The first conduit 500 is utilized to cooperate with the primary silencing cavity 230 to absorb the noise in the middle and low frequency bands, and then the micro-perforated pipe 400 is utilized to cooperate with the secondary silencing cavity to absorb the noise in the high frequency band, so that the resistance muffler can absorb the noise in the full frequency band, and the silencing effect of the full frequency band is improved.

Cooling water enters the cooling cavity 300 formed by the shell 100 and the silencing pipeline 200, and in the process of flowing in the cooling cavity 300, the cooling water can exchange heat between the high-temperature wall surfaces of the primary silencing cavity 230 and the secondary silencing cavity, so that the temperature of gas in the silencing pipeline 200 is reduced. In addition, the first spraying part 340 stretches into the primary silencing cavity 230 to spray water, and the first spraying part 340 is located above the air outlet end of the first guide pipe 500 in the application. The cross-sectional area of the first duct 500 gradually increases in a direction away from the intake duct 210; meanwhile, the width of the gap 530 between the outer wall 510 and the inner wall 520 is smaller than the pipe diameter of the gas inlet pipe 210, so that when the high temperature gas flows into the first conduit 500 through the gas inlet pipe 210, the gas flowing through the gap 530 and entering the muffling cavity may form a gas flow disturbance. In addition, the cross-sectional area of the first conduit 500 at the air outlet end is the largest, so that when the air enters the primary silencing cavity 230 through the air outlet end, the air forms a sharp cyclone vortex; at this time, the cyclone vortex is sufficiently mixed with the water mist sprayed from the first spraying part 340, so that the cooling effect of the gas can be improved. Therefore, the cooling liquid in the cooling cavity 300 exchanges heat with the gas in the silencing pipeline 200, and the gas in the silencing pipeline 200 is sprayed and cooled by the cooperation of the first guide pipe 500 and the first spraying part 340, so that the cooling effect of the gas can be comprehensively improved.

The first duct 500 located inside the primary damping chamber 230 has multiple functions, and on the one hand, the first duct 500 uses the gap 530 and the gradually changing cross-sectional area, and then cooperates with the primary damping chamber 230 to achieve the silencing effect on middle and low frequency band noise. On the other hand, the first duct 500 forms a cyclone vortex by using the gap 530 having a smaller width and the gradually increasing cross-sectional area, and spray-cools the gas in cooperation with the first spray part 340.

Further, the resistive muffler further includes a second partition 430, the second partition 430 being disposed inside the secondary muffler chamber along a radial direction of the muffler pipe 200, a sidewall of the second partition 430 being connected to an inner wall 520 of the muffler pipe 200 to divide the secondary muffler chamber into the secondary muffler chamber 240 and the tertiary muffler chamber 250. The micro-perforated pipe 400 is arranged inside the secondary muffling cavity 240, and one end of the micro-perforated pipe 400 is connected to the first partition 420 and communicated to the secondary muffling cavity 240; the other end of the micro-perforated tube 400 is connected to the second partition 430 and communicates with the tertiary acoustical damper 250.

After the micro-perforated pipe 400 is matched with the secondary silencing cavity 240 to perform high-frequency silencing on the gas, sound waves flow into the tertiary silencing cavity 250 through the micro-perforated pipe 400. In the process of flowing the sound wave into the three-stage sound-damping cavity 250, the sound wave is reflected due to the shrinkage and expansion of the cross-sectional area between the micro-perforated pipe 400 and the three-stage sound-damping cavity 250, so that the noise in the middle and low frequency bands is damped again, and the sound damping effect of the resistive muffler can be further improved.

Further, the resistive muffler further includes at least one second conduit 600, the second conduit 600 being provided to the second partition 430, one end of the second conduit 600 being connected to the secondary muffling chamber 240 and the other end being connected to the tertiary muffling chamber 250. At one end of the second conduit 600 is a curved tube segment 610, where the curved tube segment 610 is located within the tertiary acoustic attenuation chamber 250 and curves in an axial direction away from the micro-perforated tube 400.

When the second conduit 600 is used for communicating the second-stage sound-deadening chamber 240 with the third-stage sound-deadening chamber 250 and gas in the micro-perforated pipe 400 flows into the third-stage sound-deadening chamber 250 through the second conduit 600, the sound waves are emitted due to the expansion and contraction of the pipe diameter because the pipe diameter of the second conduit 600 is smaller than the pipe diameter of the micro-perforated pipe 400 and the inner diameter of the third-stage sound-deadening chamber 250, so that the sound-deadening effect of the middle-low frequency band is further improved by the cooperation of the second conduit 600 and the third-stage sound-deadening chamber 250. Meanwhile, the second conduit 600 connecting the second-stage muffling chamber 240 and the third-stage muffling chamber 250 can increase the passing frequency of the middle and low frequency bands, which is beneficial to control the pressure loss.

Further, the resistive muffler also includes a second spray portion 350 comprising a second spray head, the second spray portion 350 extending into the tertiary muffler chamber 250 for spraying water. Further, the other end of the second spray head extends into the cooling chamber 300 such that the second spray portion 350 communicates to the cooling chamber 300. With the second spraying part 350 communicating with the cooling chamber 300, the cooling structure can be simplified. The second spraying part 350 is located obliquely above the air outlet end of the second duct 600.

Because the pipe diameter of the second conduit 600 is smaller than the pipe diameter of the micro-perforated pipe 400 and the inner diameter of the tertiary sound-damping chamber 250, when the gas in the secondary sound-damping chamber 240 flows into the tertiary sound-damping chamber 250 through the second conduit 600, the gas flowing out from the gas outlet end of the second conduit 600 forms a cyclone vortex due to the reduction of the pipe diameter. Meanwhile, one end of the second conduit 600 is a curved pipe section 610, and the curved pipe section 610 is located in the three-stage acoustic cavity 250 and is curved in an axial direction away from the micro-perforated pipe 400, so that the gas can be guided to flow into the three-stage acoustic cavity 250 more dispersedly by using the curved pipe section 610, thereby forming a tapered air flow field. At this time, the cyclone vortex formed by the second duct 600 is sufficiently mixed with the water mist sprayed from the second spraying part 350, thereby enhancing the cooling effect of the gas.

Further, where the resistive muffler includes more than two second conduits 600, the second conduits 600 encircle the axial circumferential array of micro-perforated tubes 400. With the second guide pipe 600 axially arranged around the micro-perforated pipe 400, the bent pipe section 610 of the second guide pipe 600 is uniformly directed toward the inside of the tertiary sound-damping chamber 250, so that the gas flowing out through the bent pipe section 610 forms a tapered gas flow field, enhancing the cooling effect. Meanwhile, the plurality of groups of second guide pipes 600 are used for communicating the second-stage silencing cavity 240 and the third-stage silencing cavity 250, so that the working efficiency of the resistive silencer can be improved on the premise of keeping cooling and silencing effects.

Further, the resistive muffler further includes a third pipe 700, the third pipe 700 is penetrated to the second partition 430 in the axial direction of the micro-perforated pipe 400, and the second pipe 600 is disposed around the third pipe 700 because the second pipe 600 is distributed around the axial direction of the micro-perforated pipe 400. One end of the third conduit 700 is a tapered end 710, the tapered end 710 extends into and communicates with the tertiary acoustical enhancement chamber 250, while the other end of the third conduit 700 communicates with the micro-perforated tube 400.

As the gas flows through the third conduit 700 having the tapered end 710, a degree of vacuum is created at the tapered end 710 while matching the second conduit 600 around the outside of the third conduit 700, creating a sharp cyclonic vortex. The cyclone vortex can then be more fully mixed with the spray of the second spray portion 350 to more fully cool the gas. In the present application, the first guide pipe 500 and the first spraying part 340 are used to perform primary spraying cooling on the gas, and then the second guide pipe 600, the third guide pipe 700 and the second spraying part 350 are used to perform secondary spraying cooling on the gas, so that the cooling effect of the resistive muffler is improved.

Further, when the resistive muffler includes two or more second ducts 600, the lengths of the second ducts 600 are the same only at equal axial distances from the micro-perforated tube 400, and the lengths of the second ducts 600 are different in some of the second ducts 600 in this application. The use of the plurality of second ducts 600 having unequal lengths can improve the amount of sound attenuation at different frequencies of passage and also improve the cyclonic vortex formed by the plurality of second ducts 600. Meanwhile, the cooled high-temperature exhaust gas enters the three-stage silencing cavity 250 through the second duct 610 and the third duct 710, and due to the characteristic of different lengths of the second duct 610, each cross section along the axial direction of the three-stage silencing cavity 250 forms vortex, so that a three-dimensional multi-vortex space is formed in the cavity, hot exhaust gas and gasified water mist are fully mixed, water vapor in the three-stage silencing cavity 250 reaches a saturated state and is uniformly distributed, and a temperature field in the cavity is relatively uniform without local high temperature.

Further, the resistive muffler further includes an insertion tube 440, the insertion tube 440 is inserted through the first separator 420 along the axial direction of the micro-perforated tube 400, one end of the insertion tube 440 is connected to the secondary muffling chamber 240, and the other end is connected to the primary muffling chamber 230. Since the pipe diameter of the insertion pipe 440 is smaller than the inner diameter of the primary sound-damping chamber 230 and the pipe diameter of the micro-perforated pipe 400, when the gas in the primary sound-damping chamber 230 flows into the micro-perforated pipe 400 through the insertion pipe 440, the sound waves are reflected and interfered, thereby absorbing the noise of the middle and low frequency bands. In addition, the insertion tube 440 may increase the passing frequency of the middle and low frequency bands.

Further, the first conduit 500 further includes more than two guiding plates 540, wherein the guiding plates 540 are disposed in the gap 530, and two sides of the guiding plates 540 are respectively connected to the outer wall 510 and the inner wall 520; each of the guide plates 540 is disposed along a bus bar direction of the first duct 500 to divide the gap 530 into a plurality of regions. The guide plate 540 includes a first section 541 and a second section 542, the first section 541 extending from the center of the first duct 500 perpendicularly to the axial direction thereof, the second section 542 extending from the end of the first section 541 along the bus bar direction of the first duct 500; the length of the first section 541 is L, and the pipe diameter of the intake pipe 210 is D, l=d/2.

The plurality of guide plates 540 disposed in the gap 530, wherein both sides of each guide plate 540 are respectively connected to the outer wall 510 and the inner wall 520, and disposed along the bus direction of the first duct 500, so that the gap 530 can be divided into a plurality of relatively independent regions, thereby further tapering the region through which the gas flows, so that the gas outlet end of the first duct 500 can form a more abrupt cyclone vortex. At the same time, the gap 530 is partitioned by the guide plate 540, so that the gas relatively uniformly flows into the primary silencing chamber 230, thereby improving silencing and cooling effects. In this application, the guide plates 540 are uniformly distributed at equal intervals for further silencing and cooling lifting effects.

When the air inlet pipe 210 is connected to the first duct 500, since the first section 541 extends perpendicularly to the axial direction thereof from the center of the first duct 500, and the length of the first section 541 is half of the pipe diameter of the air inlet pipe 210, the first section 541 is fitted with the inner wall 520 of the first duct 500. When the first duct 500 is provided with the plurality of guide plates 540, the plurality of first segments 541 are distributed around the center of the first duct 500, so that the gas flowing out through the gas inlet pipe 210 is dispersed into each region by the plurality of first segments 541. Since the pipe diameter of the gas inlet pipe 210 is larger than the width of the interval, the pressure of the gas is larger when the gas enters the space surrounded by the first section 541 by the gas inlet pipe 210, and the pressure of the gas corresponding to the space surrounded by the first section 541 is substantially uniform, so that the gas flows more uniformly into the first conduit 500.

Further, the second section 542 is curved, in this application, the second section 542 is disposed in an arc from its connection with the first section 541 to its middle position, and is disposed in an arc from its middle position to its end, and the directions of the curvature of the two arcs are opposite. The formation of the vortex at the outlet end of the first conduit 500 may be enhanced by the curved second section 542, thereby further enhancing the sound damping and cooling effects.

Further, the first conduit 500 includes an air inlet end and an air outlet end, the air inlet end is connected to the air inlet pipe 210, the cross-sectional area of the air inlet end is S1, the cross-sectional area of the air outlet end is S2, and s1=s2/2. By defining the ratio of the cross-sectional area of the inlet end to the cross-sectional area of the outlet end of the first conduit 500, the formation of enhanced vortices may be defined, while the flow of gas to the area of the air flow field formed by the primary acoustic cavity 230 may be increased to further enhance the sound damping and cooling effects.

Further, the resistive muffler also includes at least one hydrophobic tube 260, the hydrophobic tube 260 including a hydrophobic port 261 that communicates with the interior of the muffling conduit 200. The primary sound-damping cavity 230, the secondary sound-damping cavity 240 and the tertiary sound-damping cavity 250 are all communicated with the water drain 261, so that condensate water generated in the primary sound-damping cavity 230, the secondary sound-damping cavity 240 and the tertiary sound-damping cavity 250 can be discharged. A drain valve is arranged at a specific drain port 261, and the drain of condensed water is controlled by opening and closing the drain valve.

Further, the resistive muffler further includes a spiral plate 330, and the spiral plate 330 is disposed in the cooling chamber 300 along the axial direction of the muffling pipe 200. The cooling liquid can be guided by the spiral plate 330 arranged in the cooling cavity 300, and meanwhile, the cooling liquid can be more uniformly and fully heat-exchanged with the silencing pipeline 200 and the gas in the silencing pipeline, so that the heat exchange efficiency is improved.

Further, the casing 100 is provided with a water inlet 310 and a water outlet 320 which are communicated with the cooling cavity 300; the water inlet 310 is positioned at the same end of the housing 100 as the air inlet pipe 210, and the water outlet 320 is positioned at the other opposite end of the housing 100 as the air outlet pipe 220. The cooling liquid exchanges heat around the gas in the cooling chamber 300, and the gas just flowing into the muffler pipe 200 is subjected to heat exchange and spray cooling by using the initial cooling liquid, so that the cooling effect can be improved.

The foregoing has provided a resistant muffler and boat in detail description, specific examples have been presented herein to illustrate the principles and embodiments of the present application, the above examples being provided solely to assist in understanding the methods of the present application and their core ideas; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Claims (14)

1. A resistive muffler, comprising:

a housing (100);

a muffler pipe (200) which is inserted into the housing (100) along the axial direction thereof, and the outer wall (510) of which forms a cooling chamber (300) with the inner wall (520) of the housing (100); the silencing pipeline (200) comprises an air inlet pipe (210) and an air outlet pipe (220), and one end of the air inlet pipe (210) and one end of the air outlet pipe (220) extend out of the shell (100);

a first partition plate (420) disposed in the muffler pipe (200) along a radial direction of the muffler pipe (200), a side wall of the first partition plate (420) being connected to an inner wall (520) of the muffler pipe (200) to divide an interior of the muffler pipe (200) into a primary muffler chamber (230) and a secondary muffler chamber; the air inlet pipe (210) is communicated with the primary silencing cavity (230), and the air outlet pipe (220) is communicated with the secondary silencing cavity;

a micro-perforated tube (400) disposed in the secondary sound-damping chamber along an axial direction thereof, and having one end connected to the first separator (420); the micro-perforated pipe (400) is provided with at least two micropores (410), and the micropores (410) are distributed along the axial direction and the circumferential direction of the micro-perforated pipe (400);

a conical first conduit (500) axially disposed within the primary acoustic chamber (230) and comprising an outer wall (510) and an inner wall (520), wherein a gap (530) exists between the outer wall (510) and the inner wall (520), and the gap (530) is communicated to the air inlet pipe (210); the cross-sectional area of the first conduit (500) increases in a direction away from the air inlet pipe (210); and

the first spraying part (340) stretches into the primary silencing cavity (230) to spray water;

a second partition plate (430) disposed in the secondary sound-damping chamber along a radial direction of the sound-damping duct (200), a side wall of the second partition plate (430) being connected to an inner wall (520) of the sound-damping duct (200) to divide the secondary sound-damping chamber into a secondary sound-damping chamber (240) and a tertiary sound-damping chamber (250);

at least one second conduit (600) connected to the second partition (430), one end of the second conduit (600) being connected to the secondary sound-damping chamber (240) and the other end being connected to the tertiary sound-damping chamber (250);

the pipe diameter of the second conduit (600) is smaller than the pipe diameter of the micro-perforated pipe (400) and the inner diameter of the three-stage sound-eliminating cavity (250).

2. The resistant muffler of claim 1 wherein,

the micro-perforated tube (400) is arranged in the secondary silencing cavity (240), one end of the micro-perforated tube (400) is connected to the first partition board (420), and the other end of the micro-perforated tube is connected to the second partition board (430).

3. The resistant muffler of claim 2 wherein,

one end of the second conduit (600) is a bent pipe section (610), and the bent pipe section (610) is positioned in the three-stage sound-absorbing cavity (250) and is bent towards the axial direction far away from the micro-perforated pipe (400).

4. A resistive muffler as defined in claim 3, wherein when the resistive muffler comprises more than two of the second conduits (600), the second conduits (600) encircle an axial circumferential array of the micro-perforated pipes (400).

5. The resistive muffler of claim 3, further comprising:

the second spraying part (350) stretches into the three-stage silencing cavity (250) to spray water; the second spraying part (350) is communicated with the cooling cavity (300);

the first spray portion (340) is communicated to the cooling cavity (300).

6. The resistive muffler of claim 1, further comprising:

and an insertion tube (440) connected to the first separator (420) along the axial direction of the micro-perforated tube (400), one end of the insertion tube (440) being connected to the secondary sound-damping chamber (240) and the other end being connected to the primary sound-damping chamber (230).

7. The resistive muffler as defined in claim 1, wherein the first conduit (500) further comprises:

two or more guide plates (540) disposed in the gap (530) and having both side surfaces connected to the outer wall (510) and the inner wall (520), respectively; each of the guide plates (540) is disposed along a bus direction of the first duct (500) to separate the gap (530);

the guide plate (540) comprises a first section (541) and a second section (542), wherein the first section (541) extends from the center of the first conduit (500) to the axial direction thereof, and the second section (542) extends from the end of the first section (541) along the direction of the generatrix of the first conduit (500); the length of the first section (541) is L, and the pipe diameter of the air inlet pipe (210) is D, where l=d/2.

8. The resistant muffler of claim 7 wherein,

the second section (542) is curved;

the first conduit (500) comprises an air inlet end and an air outlet end, the air inlet end is communicated to the air inlet pipe (210), the cross section area of the air inlet end is S1, the cross section area of the air outlet end is S2, and S1=S2/2.

9. The resistive muffler of claim 2, further comprising:

and the third conduit (700) is penetrated onto the second partition plate (430) along the axial direction of the micro-perforated pipe (400), one end of the third conduit is a conical end (710), the conical end (710) stretches into and is communicated with the three-level silencing cavity (250), and the other end of the third conduit (700) is communicated with the micro-perforated pipe (400).

10. A resistive muffler according to claim 3, characterized in that when the resistive muffler comprises more than two of said second conduits (600), the lengths of said second conduits (600) are the same only at equal axial distances from said micro-perforated pipes (400).

11. The resistive muffler of claim 1, further comprising:

at least one hydrophobic port (261) communicating to the interior of the muffling conduit (200).

12. The resistive muffler of claim 1, further comprising:

and a spiral plate (330) disposed in the cooling chamber (300) along the axial direction of the muffler pipe (200).

13. The resistant muffler as set forth in claim 1, wherein the housing (100) is provided with a water inlet (310) and a water outlet (320) communicating with the cooling chamber (300);

the water inlet (310) and the air inlet pipe (210) are positioned at the same end of the shell (100), and the water outlet (320) and the air outlet pipe (220) are positioned at the other opposite end of the shell (100).

14. A ship comprising a resistant muffler as claimed in any one of claims 1 to 13.

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