KR20230094805A - Basalt sound absorbing material applied eco-friendly hybrid silencer capable of reducing low frequency band for marine generator engine - Google Patents

Abstract

The present invention relates to an eco-friendly hybrid silencer for a marine engine which enhances heat resistance and reduces a low-frequency noise by applying a basalt sound-absorbing material. According to one embodiment of the present invention, provided is the eco-friendly hybrid silencer for the marine engine which enhances the heat resistance and reduces the low-frequency noise by applying the basalt sound-absorbing material. The eco-friendly hybrid silencer for the marine engine capable of enhancing the heat resistance and reducing the low-frequency noise by applying the basalt sound-absorbing material according to an embodiment of the present invention comprises: an exhaust sound-absorbing main body of a cylinder shape provided with an entrance and an exit; a spark arrestor located at the entrance of the exhaust sound-absorbing main body; a plurality of cylinder sound-absorbing units located at intervals at the interior of the exhaust sound-absorbing main body; and a core sound-absorbing unit located in the center part of the plurality of cylinder sound-absorbing units. The eco-friendly hybrid silencer for the marine engine uses the basalt sound-absorbing material, which prevents environmental pollution when the sound-absorbing material is disposed of.

Description

An eco-friendly hybrid silencer for marine engines that can enhance heat resistance and reduce low-frequency noise by applying basalt sound-absorbing material

The present invention relates to a silencer for a ship engine, and more particularly, to an eco-friendly hybrid silencer capable of reducing low-frequency bands for a ship engine, which reduces low-band noise generated by a ship engine and at the same time further enhances heat resistance by applying a basalt sound absorbing material. It is about.

In general, when high-temperature and high-pressure exhaust gas discharged from an internal combustion engine such as a medium-large ship engine is discharged as it is, an explosion sound is generated due to rapid expansion of the exhaust gas.

In order to prevent this, a silencer is mounted on the exhaust pipe of the engine, and a cross section inside the silencer is changed to attenuate engine noise or a sound absorbing material is provided inside the silencer to absorb and attenuate sound energy.

Exhaust gas is discharged through an exhaust pipe, and a problem in that exhaust noise is transferred together may occur due to a regular or irregular flow of exhaust gas in the exhaust pipe. In particular, the exhaust pipe connected to the engine is the main transmission path for the exhaust sound generated by engine operation, and when one or more large-capacity engines are used, such as a ship, the propagation and radiation of exhaust noise through the exhaust pipe is a very big problem. .

For this reason, in the prior art, noise removal equipment such as a silencer was added in the middle of the exhaust pipe and used in many cases. The silencer is a structure used by being coupled to the middle of the exhaust pipe, and may be formed in the form of an expanded pipe, and a sound absorbing material or the like may be installed inside.

However, as stricter noise standards have recently been applied, it has become difficult to satisfy them only with equipment such as a conventional silencer. For example, even if a silencer is used, only a part of the exhaust noise band is removed, which can be a problem. In the case of expanding the abatement range of exhaust noise and increasing the removal efficiency, the volume of the silencer increases and the device becomes bloated and structurally Inappropriate problems may arise.

In particular, an appropriate solution has not been proposed for engine exhaust noise in a low frequency band (72 Hz to 108 Hz), and environmental pollution may be caused during disposal of the used sound absorbing material.

In addition, existing silencers for ships have a problem in that the lifespan of the silencer is shortened due to deterioration and scattering of the sound absorbing material due to high temperature (300 ~ 400 ° C.) and high-speed fluid flow.

1. US101301608B1 2. US200443513Y1

The purpose of the present invention for solving the above problems is to increase the sound absorption coefficient in the low frequency band (72Hz ~ 108Hz), and to strengthen the heat resistance by applying the basalt sound absorbing material to which the basalt sound absorbing material is applied to prevent environmental pollution when the sound absorbing material is disposed of, and to enhance heat resistance in the low frequency band To provide an eco-friendly hybrid silencer for a ship engine capable of reducing noise.

The technical problem to be achieved by the present invention is not limited to the above-mentioned technical problem, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

The configuration of the present invention for achieving the above object is a cylindrical exhaust sound absorbing body provided with an inlet and an outlet; A spark arrestor located at the inlet of the exhaust sound absorbing body; a plurality of cylindrical sound absorbing parts positioned at intervals inside the exhaust sound absorbing body; And a core sound absorbing part located at the center of the plurality of cylindrical sound absorbing parts, wherein the cylindrical sound absorbing part and the core sound absorbing part include basalt wool, and a basalt sound absorbing material prepared by including any one of basalt fabric and silica fabric laminated on the basalt wool. Including, the cylindrical sound absorbing portion, the outer perforated plate located on the outside; And an eco-friendly hybrid silencer for ship engines that includes an inner perforated plate located inside the outer perforated plate, and can enhance heat resistance and reduce noise in the low frequency band by applying a basalt sound absorbing material in which the basalt sound absorbing material is located between the outer perforated plate and the inner perforated plate. to provide.

In one embodiment of the present invention, the plurality of cylindrical sound absorbing portion, a first cylindrical sound absorbing portion located on the inlet side of the exhaust sound absorbing body; a second cylindrical sound absorbing unit spaced apart from the second cylindrical sound absorbing unit; and a third cylindrical sound absorbing part spaced apart from the second cylindrical sound absorbing part, wherein the first and second cylindrical sound absorbing parts are located in a front part with respect to the central part of the exhaust sound absorbing body, and the third cylindrical sound absorbing part is located in the front part of the exhaust sound absorbing body. It is provided longer than the sum of the 1 and 2 cylindrical sound absorbing parts, and may be located up to the rear end of the exhaust sound absorbing body based on the central part.

In one embodiment of the present invention, the core sound-absorbing part has a cylindrical pipe shape in which the front and rear parts are blocked, and is disposed to correspond to the plurality of cylindrical sound-absorbing parts, and has a plurality of resonance openings connecting the outside and the inside. can be provided.

In one embodiment of the present invention, the core sound-absorbing portion, the outer core tube located on the outside; an inner core tube located inside the outer core tube; and a round cover closing both ends of the outer core tube, wherein the outer core tube and the inner core tube are provided with a plurality of resonance openings, and the inner core tube has a plurality of resonance openings corresponding to the plurality of resonance openings. A plurality of barrier ribs providing resonance compartments may be provided.

In one embodiment of the present invention, the plurality of resonance compartments, the first resonance compartment provided from the first cylindrical sound absorbing portion to a portion of the second cylindrical sound absorbing portion; a second resonance compartment provided from the second cylindrical sound absorbing part to the third cylindrical sound absorbing part; and a plurality of third resonant compartments provided corresponding to the third cylindrical sound absorbing unit, wherein the first resonant compartment, the second resonant compartment, and the third resonant compartment are the main flow of exhaust gas in the exhaust sound absorbing body. It may be provided shorter along the direction.

In one embodiment of the present invention, the core sound absorbing portion is disposed along the exhaust sound absorbing body, is located at the upper and lower centers of the plurality of cylindrical sound absorbing portions, and includes a plurality of core sound absorbing plates having the basalt sound absorbing material, , Resonance openings communicating with the plurality of cylindrical sound absorbing portions may be provided on both sides between the plurality of core sound absorbing plates.

In one embodiment of the present invention, the plurality of cylindrical sound absorbing parts, a first cylindrical sound absorbing part located in the front portion of the exhaust sound absorbing main body; and a second cylindrical sound absorbing part spaced apart from the first cylindrical sound absorbing part and located from the center to the rear part of the exhaust sound absorbing body.

In one embodiment of the present invention, the spark arrestor includes a cylindrical arrestor body corresponding to an inlet of the exhaust sound absorbing body; a circulating flow unit coupled to the arrestor body to form a circulating flow towards the inlet side of the exhaust sound absorbing body, and having a plurality of circulating blades and a shaft; and a dust storage unit coupled to an outer circumferential portion of the arrestor body and configured to store exhaust dust of exhaust gas circulated by the circulating flow unit.

In one embodiment of the present invention, the basalt sound absorbing material further includes a ceramic resin combining the basalt wool and the basalt fabric or silica fabric and coupling the basalt sound absorbing material to the exhaust sound absorbing body, wherein the basalt wool This may be disposed inside the exhaust sound absorbing body rather than the basalt fabric or the silica fabric.

In one embodiment of the present invention, a splitter provided in a triangular cross-sectional shape at an outlet side of the exhaust sound absorbing body and disposed in a radial direction of the exhaust sound absorbing body may be further included.

Effects of the present invention according to the configuration as described above, increase the sound absorption coefficient in the low frequency band (72Hz ~ 108Hz), can provide the advantage of preventing environmental pollution when the sound-absorbing material is discarded.

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a three-dimensional view of an eco-friendly hybrid silencer for a ship engine capable of enhancing heat resistance and reducing noise in a low frequency band by applying a basalt sound absorbing material according to an embodiment of the present invention.
FIG. 2 is a front view of the exhaust sound absorbing body of FIG. 1 taken in a longitudinal direction;
3 is a perspective view (a) and a left side view (b) of the spark arrestor of FIG. 2;
4 is a front view (a) and a plan view (b) and a front view (c) of a shaft of the circulating blade of the circulating flow unit of FIG. 2;
5 is a partial cross-sectional view of the cylindrical sound absorbing portion of FIG. 2 .
6 is a cross-sectional front view of an exhaust sound absorbing body of an eco-friendly hybrid silencer capable of reducing a low frequency band for a ship generator engine to which a basalt sound absorbing material according to another embodiment of the present invention is applied in the longitudinal direction.
FIG. 7 is a right side view in which the splitter in FIG. 6 is separated.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms, and therefore is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, combined)" with another part, this is not only "directly connected", but also "indirectly connected" with another member in between. "Including cases where In addition, when a part "includes" a certain component, it means that it may further include other components without excluding other components unless otherwise stated.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a three-dimensional view of an eco-friendly hybrid silencer for a ship engine capable of enhancing heat resistance and reducing noise in a low frequency band by applying a basalt sound absorbing material according to an embodiment of the present invention, and FIG. 2 is a longitudinal cross-section of the exhaust sound absorbing body of FIG. 1 It is a front view.

1 and 2, the eco-friendly hybrid silencer 100 for a ship engine capable of enhancing heat resistance and reducing low-frequency noise by applying a basalt sound absorbing material according to an embodiment of the present invention is a cylindrical exhaust with an inlet and an outlet. A sound absorbing body 101, a spark arrester 110 located at the entrance of the exhaust sound absorbing body 101, a plurality of cylindrical sound absorbing parts 130 positioned at intervals inside the exhaust sound absorbing body 101, and a core sound absorbing part 150 located at the center of the plurality of cylindrical sound absorbing parts 130 .

The exhaust sound absorbing body 101 is located in the exhaust line of the ship engine, is configured to allow exhaust gas to flow into the inlet and pass through the outlet, and is provided by combining a plurality of cylindrical tube bodies 120. In the exhaust sound absorbing body 101, the inlet is located on the side of the spark arrestor 110, and the outlet is located on the side of the splitter 170 to be described later.

3 is a perspective view (a) and a left side view (b) of the spark arrestor of FIG. 2, and FIG. 4 is a front view (a) and a plan view (b) and a front view of a shaft ( c) is.

2 to 4, the spark arrestor 110 is coupled to the cylindrical arrestor body 111 corresponding to the inlet of the exhaust sound absorbing body 101 and the arrestor body 111 to the exhaust sound absorbing body ( 101) coupled to the outer circumferential portion of the circulating flow part 120 having a plurality of circulating wings 121 and a shaft 125 to form a circulating flow toward the inlet side, and the arrestor body 111, and the circulating flow part 120 It may include a dust storage unit 128 in which exhaust dust of exhaust gas circulated by the is stored.

The spark arrestor 110 provides exhaust gas that has been circulated to the inlet side of the exhaust sound absorbing body 101 so that the exhaust gas passes evenly toward the plurality of cylindrical sound absorbing parts 130 and the core sound absorbing part 150, , It plays a role in filtering exhaust dust from exhaust gas by centrifugal force.

The rotating wing 121 is divided into a front wing 122 and a rear wing 123 coupled to the shaft 125.

The front wing 122 is disposed in a straight line corresponding to the center line of the shaft 125, and the rear wing 123 is disposed inclined at a predetermined angle with respect to the center line of the shaft 125.

That is, the front wing 122 is disposed along the longitudinal direction of the shaft 125 and coupled in the radial direction, and the rear wing 123 is bent at a certain angle with respect to the front wing 122 and coupled to the shaft 125 .

In addition, both sides of the front wing 122 form a right angle, the lower front end coupled to the shaft 125 is inclined, and the outer circumferential surface of the shaft 125 goes toward the rear end side and inclines opposite to the front end It has an indeterminate shape .

The rear wing 123 has a quadrilateral shape in which the front and rear ends are parallel and the front end is longer than the rear end, and the upper and lower surfaces connecting the front and rear ends are curved and inclined in opposite directions.

The shaft 125 has a front portion having a cylindrical shape and a rear portion having a tapered cone shape gradually expanding from the cylindrical shape, and provides outer circumferential surfaces corresponding to lower surfaces of the front wing 122 and the rear wing 123.

The circular wing 121 composed of the front wing 122 and the rear wing 123 is coupled to the shaft 125 to circulate the exhaust gas passing through the arrestor body 111. At this time, the exhaust gas is 30 to 40 m/s per second, and after passing through the front wing 122, the flow direction is changed by the inclination angle of the rear wing 123 to form a circular flow.

The front wing 122 is provided with a larger area than the rear wing 123 and provides flow passages divided by the number of wings in the arrestor body 111, and the rear wing 123 is inclined with respect to the front wing 122. By guiding the exhaust gas in a shape, a convection action occurs from the front wing 122 side.

5 is a partial cross-sectional view of the cylindrical sound absorbing portion of FIG. 2 .

2 and 5, the plurality of cylindrical sound absorbing parts 130 include an outer perforated plate 135 located on the outside and an inner perforated plate 136 located inside the outer perforated plate 135, A basalt sound absorbing material 140 is positioned between the outer perforated plate 135 and the inner perforated plate 136.

In addition, the plurality of cylindrical sound absorbing parts 130, the first cylindrical sound absorbing part 131 and the second cylindrical sound absorbing part 132 positioned at the inlet side of the exhaust sound absorbing body 101 and the second cylindrical sound absorbing part positioned apart from each other It includes a part 132 and a third cylindrical sound absorbing part 133 positioned apart from the second cylindrical sound absorbing part 132 .

The first and second cylindrical sound absorbing parts 130 are located in the front part with respect to the central part of the exhaust sound absorbing body 101, and the third cylindrical sound absorbing part 133 is the first and second cylindrical sound absorbing parts 131 and 132. It is provided longer than the combined length and may be located up to the rear end based on the central portion of the exhaust sound absorbing body 101.

The arrangement structure and length of the plurality of cylindrical sound absorbing parts 130 provide an exhaust sound absorbing structure corresponding to the exhaust pressure gradient from the inlet to the outlet of the exhaust sound absorbing body 101 .

Since the pressure of the exhaust gas is high between the inlet and the central portion of the exhaust sound absorbing body 101, the first and second cylindrical sound absorbing parts 131 and 132 spaced apart from each other are the exhaust that is transmitted to the inner wall of the exhaust sound absorbing body 101. will reduce noise

Between the central portion of the exhaust sound absorbing body 101 and the outlet, since the pressure of the exhaust gas is reduced, the third cylindrical sound absorbing portion 133 disposed integrally and long reduces exhaust noise transmitted to the inner wall of the exhaust sound absorbing body 101. will reduce

The first to third cylindrical sound absorbing parts 131 , 132 , and 133 are spaced apart from the inner circumferential surface of the exhaust sound absorbing body 101 to create an annular space with one side blocked by an annular bracket 146 . After filling the annular space, the exhaust gas creates a certain pressure in the annular space and passes through the inner space of the plurality of cylindrical sound absorbing parts 130, so the exhaust gas transferred from the cylindrical sound absorbing part 130 side to the annular space side The radiated noise can be doubly attenuated by the basalt sound absorbing material 140 of each cylindrical sound absorbing part 130 and the exhaust gas filling the annular space with the exhaust pressure.

The plurality of cylindrical sound absorbing parts 130 are provided with a basalt sound absorbing material 140 between the outer perforated plate 135 and the inner perforated plate 136, and the impact and momentum of the exhaust gas transmitted through the outer perforated holes and the inner perforated holes. It provides a sound absorption structure that can withstand the high heat of exhaust gas between 300 and 800 degrees Celsius while sufficiently absorbing

As such, the cylindrical sound absorbing unit 130 is provided with a basalt sound absorbing material 140 mainly made of basalt as a sound absorbing material for reducing exhaust noise.

The basalt sound absorbing material 140 includes basalt wool 141 on the innermost side, and basalt fabric 142 and silica fabric laminated on the outside of the basalt wool 141 . A silica fabric may be used in place of the basalt fabric 142.

The basalt sound absorbing material 140 combines the basalt wool 141 and the basalt fabric 142 or silica fabric, and further includes a ceramic resin 143 coupling the basalt sound absorbing material 140 to the exhaust sound absorbing body 101, The basalt wool 141 may be disposed inside the exhaust sound absorbing body 101 rather than the basalt fabric 142 or the silica fabric.

The basalt sound absorbing material 140 has a structure in which the basalt wool 141 is three times thicker than the basalt fabric 142 or the silica fabric, and is composed of existing inorganic mineral wool, glass wool, or organic polyester wool. It has excellent heat resistance, so the sound absorption performance does not deteriorate at high heat, and it is environmentally friendly because it can be disposed of naturally.

The basalt wool 141 and the basalt fabric 142 or the silica fabric may be combined and laminated with a ceramic resin 143, and in a laminated state, the outer perforated plate of the cylindrical sound absorbing portion 130 using the ceramic resin 143 ( 135) can be combined.

On the other hand, the cylindrical sound absorbing portion 130 is coupled to the inner wall portion of the exhaust sound absorbing body 101 by a plate-shaped bracket 145 and an annular bracket 146.

The plate-shaped bracket 145 has a baffle shape disposed radially at the front portion of the cylindrical sound absorbing portion 130, and the plate-shaped bracket 145 has a donut shape disposed radially at the rear portion of the cylindrical sound absorbing portion 130.

The plate-shaped bracket 145 is disposed at right angles to the inner wall of the exhaust sound absorbing body 101, and is disposed in a flat plate shape corresponding to the center line of the exhaust sound absorbing body 101, and the annular bracket 146 is the exhaust sound absorbing body 101 ) Is disposed at right angles to the inner wall portion, and is disposed to cross the center line of the exhaust sound absorbing body 101 at right angles.

Accordingly, the plate-shaped bracket 145 is disposed on the outer circumferential surface of the cylindrical sound absorbing portion 130 in a shape that does not resist exhaust gas, and the annular bracket 146 is arranged to block the exhaust gas on the outer circumferential surface of the cylindrical sound absorbing portion 130. make

After passing through the plate-shaped bracket 145 and flowing toward the annular bracket 146, the exhaust gas is blocked by the annular bracket 146, so that it passes through each inner space of the plurality of cylindrical sound absorbing parts 130.

At the center line of the plurality of cylindrical sound absorbing units 130 , a core sound absorbing unit 150 absorbing exhaust gas noise is disposed at the central portion of the plurality of cylindrical sound absorbing units 130 .

The core sound absorbing part 150 has a cylindrical pipe shape in which the front and rear parts are blocked, and is disposed to correspond to the plurality of cylindrical sound absorbing parts 130, respectively, and has a plurality of resonance openings 155 connecting the outside and the inside. It can be.

The core sound absorbing portion 150 closes both ends of the outer core tube 151 located on the outside, the inner core tube 152 located inside the outer core tube 151, and both ends of the outer core tube 151. It includes a round cover 153 that does.

The outer core tube 151 and the inner core tube 152 are provided with a plurality of resonance openings 155, and a plurality of resonance compartments 161 corresponding to the plurality of resonance openings 155 in the inner core tube 152. A plurality of barrier ribs 156 having a disk shape providing 162 and 163 may be provided.

The outer core pipe 151 and the inner core pipe 152 are formed with perforated holes for absorbing exhaust gas. In addition, between the outer core tube 151 and the inner core tube 152, it is disposed in the cylindrical sound absorbing portion 130 as shown in FIG. 5, and the basalt wool 141 and the basalt fabric laminated on the basalt wool 141 ( 142) and a basalt sound absorbing material 140 including any one of silica fabric is provided.

The core sound absorbing part 150 is coupled to the exhaust sound absorbing body 101 and the cylindrical sound absorbing part 130 by core brackets 158 disposed at the front and rear ends and is fixed in position.

A plurality of resonance compartments (161, 162, 163), the first resonance compartment 161, the second cylindrical sound absorbing portion 132 provided from the first cylindrical sound absorbing portion 131 to a portion of the second cylindrical sound absorbing portion 132 The second resonance compartment 162 provided before the third cylindrical sound absorbing portion 133, and a plurality of third resonance compartments 163 provided corresponding to the third cylindrical sound absorbing portion 133 are included.

The first resonance compartment 161, the second resonance compartment 162, and the plurality of third resonance compartments 163 are gradually shorter along the mainstream flow direction of the exhaust gas passing through the central portion in the exhaust sound absorbing body 101. provided The first to third resonance compartments 161, 162, and 163 have a length structure corresponding to the pressure gradient gradually decreasing from the front part to the rear part of the exhaust sound absorbing body 101, passing through the center of the exhaust sound absorbing body 101. It will reduce the exhaust noise of the exhaust gas.

The core sound absorbing part 150 has a resonance opening 155 disposed corresponding to the plurality of cylindrical sound absorbing parts 130 and is blocked with a front and rear round cover 153, and flows into the plurality of cylindrical sound absorbing parts 130. It provides a structure capable of attenuating the impact and momentum of the exhaust gas to be attenuated by the basalt sound absorbing material 140 and the resonance opening 155 provided in the core sound absorbing portion 150.

Since the annular bracket 146 is disposed at the rear end of each of the plurality of cylindrical sound absorbing parts 130, the exhaust gas passes through the core sound absorbing part 150 while passing through the inside of the plurality of cylindrical sound absorbing parts 130. .

The first resonance compartment 161 corresponds to the first cylindrical sound absorbing unit 131, the second resonance compartment 162 corresponds to the second cylindrical sound absorbing unit 132, and the plurality of third resonance compartments 163 It is disposed corresponding to the third cylindrical sound absorbing part 133 .

The core sound absorbing portion 150 absorbs the impact and momentum of the exhaust gas by the basalt sound absorbing material 140 while allowing fluid vibration entry and exit of the exhaust gas applied to the central portion of the exhaust sound absorbing body 101 into the resonance opening 155. It reduces noise and resonates with the low-frequency vibration generated in the exhaust gas to sufficiently prevent low-frequency noise.

According to this embodiment as described above, it is possible to reduce 10 dB of low frequency band (72 Hz to 108 Hz) and 35 dB of radiated noise.

In this embodiment, a splitter 170 provided in a radial direction of the exhaust sound absorbing body 101 in a triangular cross-sectional shape may be further included on the outlet side of the exhaust sound absorbing body 101 .

The splitter 170 is disposed vertically across the outlet of the exhaust sound absorbing body 101, and serves to make the exhaust gas passing through the outlet of the exhaust sound absorbing body 101 a constant flow by means of a triangular cross section.

6 is a cross-sectional front view of an exhaust sound absorbing body of an eco-friendly hybrid silencer for a ship engine capable of enhancing heat resistance and reducing noise in a low frequency band by applying a basalt sound absorbing material according to another embodiment of the present invention in the longitudinal direction, and FIG. This is a right side view with the splitter removed.

6 and 7, the eco-friendly hybrid silencer for a ship engine capable of enhancing heat resistance and reducing low-frequency noise by applying a basalt sound absorbing material according to another embodiment of the present invention includes an exhaust sound absorbing body 201, a spark arrestor ( 210), the basalt sound absorbing material 240, and the splitter 270 are provided in the same manner as in the above-described embodiment, and the plurality of cylindrical sound absorbing parts 230 are located in the front part of the exhaust sound absorbing body 201. It may include a part 231 and a second cylindrical sound absorbing part 232 spaced apart from the first cylindrical sound absorbing part 231 and located from the central part to the rear part of the exhaust sound absorbing body 201.

The plurality of cylindrical sound absorbing parts 230 have the same structure as the above-mentioned cylindrical sound absorbing part 130, and only the arrangement length and spacing are different inside the exhaust sound absorbing body 201, so detailed information about the perforated plate and the basalt sound absorbing material 240 Description of the laminated structure is omitted.

In addition, the core sound absorbing portion 250 is disposed along the exhaust sound absorbing body 201, is located at the upper and lower centers of the plurality of cylindrical sound absorbing portions 230, and has a plurality of core sound absorbing plates having basalt sound absorbing materials 240. (251) may be included.

Since the core sound absorbing part 250 has the same perforated plate and basalt sound absorbing material 240 structure as the above-described core sound absorbing part 150, and only the arrangement structure and shape are different inside the exhaust sound absorbing body 201, the perforated plate and the basalt sound absorbing material ( 240), description of the detailed layered structure is omitted.

In the sound absorbing structure inside the exhaust sound absorbing body 201 according to another embodiment, a plurality of core sound absorbing plates 251 spaced apart from each other are disposed in the central portions of the first cylindrical sound absorbing portion 231 and the second cylindrical sound absorbing portion 232 As a structure, resonance openings 255 communicating toward the plurality of cylindrical sound absorbing portions 230 may be provided on both sides between the plurality of core sound absorbing plates 251 .

According to this other embodiment, the first cylindrical sound absorbing portion 231 and the second cylindrical sound absorbing portion 232 of the exhaust sound absorbing body 201 block and absorb noise transmitted to the exhaust sound absorbing body 201, and absorb exhaust sound. Noise transmitted to the central portion of the main body 201 is absorbed by the core sound absorbing portion 250 .

The core sound absorbing unit 250 is an exhaust sound absorbing body 201 by providing a flow structure through which exhaust gas can pass into the first cylindrical sound absorbing unit 231 and the second cylindrical sound absorbing unit 232 in the exhaust sound absorbing body 201 ( 201) permits the entry and exit of the exhaust gas that creates vibration of the exhaust gas applied to the central portion side through the resonance opening 255, and the noise pressure is reduced by the basalt sound absorbing material 140.

Meanwhile, an annular partition wall 258 is disposed between the first cylindrical sound absorbing portion 231 and the second cylindrical sound absorbing portion 232 .

The annular bulkhead 258 reduces exhaust pressure by providing fluid resistance between the first cylindrical sound absorbing portion 231 and the second cylindrical sound absorbing portion 232, and the pressure of the exhaust gas is reduced to the first cylindrical sound absorbing portion ( 231) smoothly enters the second cylindrical sound absorbing portion 232, thereby reducing noise and vibration.

According to the above embodiments, when conventional mineral wool or glass wool is used, there is a problem of scattering due to poor heat resistance. However, by applying basalt wool and basalt fabric, heat resistance is enhanced and scattering is prevented, thereby extending service life and enabling environmentally friendly treatment. It is possible, and noise reduction in the low frequency band, which is a problem in existing silencers, is solved.

In other words, the mineral wool sound absorbing material, which is a component of the existing sound absorbing material, causes serious environmental problems such as air quality and air pollution due to external scattering due to high speed flow and high heat. It is more than twice as long, does not melt at the incineration temperature, remains as ashes and returns to nature, so nature-friendly, that is, eco-friendly treatment can be achieved.

For example, at 400 ~ 500℃, which is the environmental temperature of the exhaust port, mineral wool undergoes hot shrinkage at high temperatures for a long period of time and melts at 445.3℃, glass fabric melts at 856.9℃, but basalt fabric does not melt at 957.7℃. , basalt wool also does not melt at 927.5°C.

In this way, in the present embodiments, the basalt wool and the basalt fabric are applied, thereby solving the problem of deterioration in durability and loss of sound absorption function due to deterioration and scattering occurring in conventional glass fiber and mineral wool sound absorbing materials.

Moreover, according to the present embodiments, non-flammability (FTP Code Part 1) standards and smoke and toxicity (Smoke, Toxicity: FTP Code Part 2) standards are satisfied, and the sound absorption rate (pipe law, KS F 2814-2) is 0.45 or more , and the sound absorption coefficient (reverberation room method, KS F 2805) is 0.70 or more.

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included in the scope of the present invention.

100: silencer 101: exhaust sound absorbing body
102: cylindrical tube body 110: spark arrestor
111: arrestor body 120: circulating flow part
121: multiple circulating wings 122: front wings
123: rear wing 125: shaft
128: dust storage unit 130: a plurality of cylindrical sound absorbing units
131: first cylindrical sound absorbing portion 132: second cylindrical sound absorbing portion
133: third cylindrical sound absorbing portion 135: outer perforated plate
136: inner perforated plate 140: basalt sound absorbing material
141: basalt wool 142: basalt fabric
143: ceramic resin 145: plate bracket
146: annular bracket 150: core sound absorbing part
151: outer core tube 152: inner core tube
153 round cover 155 resonance opening
156: bulkhead 158: core bracket
161 First resonance compartment
162: second resonance compartment 163: third resonance compartment
170: splitter
201: exhaust sound absorbing body 210: spark arrestor
270: splitter 230: cylindrical sound absorbing unit
231: first cylindrical sound absorbing portion 232: second cylindrical sound absorbing portion
240: basalt sound absorbing material 250: core sound absorbing part
251: core sound absorption plate 255: resonance aperture

Claims (10)

A cylindrical exhaust sound absorbing body provided with an inlet and an outlet;
A spark arrestor located at the inlet of the exhaust sound absorbing body;
a plurality of cylindrical sound absorbing parts positioned at intervals inside the exhaust sound absorbing body; and
And a core sound absorbing part located in the center of the plurality of cylindrical sound absorbing parts,
The cylindrical sound absorbing part and the core sound absorbing part include basalt wool and a basalt sound absorbing material prepared by including any one of basalt fabric and silica fabric laminated on the basalt wool,
The cylindrical sound absorbing part,
An outer perforated plate located on the outer side; and
Including an inner perforated plate located inside the outer perforated plate,
An eco-friendly hybrid silencer for a ship engine capable of enhancing heat resistance and reducing noise in the low frequency band by applying a basalt sound absorbing material, characterized in that the basalt sound absorbing material is located between the outer perforated plate and the inner perforated plate.
The method of claim 1,
The plurality of cylindrical sound absorbing parts,
a first cylindrical sound absorbing part located at an inlet side of the exhaust sound absorbing body;
a second cylindrical sound absorbing unit spaced apart from the second cylindrical sound absorbing unit; and
And a third cylindrical sound absorbing portion positioned apart from the second cylindrical sound absorbing portion,
The first and second cylindrical sound absorbing parts are located in the front part with respect to the central part of the exhaust sound absorbing body,
The third cylindrical sound absorbing part is provided longer than the combined length of the first and second cylindrical sound absorbing parts and is located up to the rear end of the exhaust sound absorbing body based on the central part of the exhaust sound absorbing body. Eco-friendly hybrid silencer for marine engines.
The method of claim 2,
The core sound absorbing part has a cylindrical pipe shape in which the front and rear parts are blocked,
Eco-friendly hybrid silencer for marine engines capable of enhancing heat resistance and reducing noise in the low frequency band by applying a basalt sound absorbing material, characterized in that disposed in correspondence with the plurality of cylindrical sound absorbing parts and having a plurality of resonance openings connecting the outside and the inside. Hybrid silencer.
The method of claim 3,
The core sound absorbing part,
An outer core tube located outside;
an inner core tube located inside the outer core tube; and
Includes a round cover closing both ends of the outer core tube,
The outer core tube and the inner core tube are provided with the plurality of resonance openings,
The inner core tube is provided with a plurality of partitions for providing a plurality of resonance compartments corresponding to the plurality of resonance openings, characterized in that by applying a basalt sound absorbing material to enhance heat resistance and reduce noise in the low frequency band. Eco-friendly hybrid silencer for marine engines.
The method of claim 4,
The plurality of resonance compartments,
a first resonance compartment provided from the first cylindrical sound absorbing part to a portion of the second cylindrical sound absorbing part;
a second resonance compartment provided from the second cylindrical sound absorbing part to the third cylindrical sound absorbing part; and
And a plurality of third resonance compartments provided corresponding to the third cylindrical sound absorbing unit,
The first resonance compartment, the second resonance compartment, and the third resonance compartment are provided shorter along the mainstream flow direction of the exhaust gas in the exhaust sound absorbing body, thereby enhancing heat resistance and low frequency band noise by applying a basalt sound absorbing material. Eco-friendly hybrid silencer for ship engines that can be reduced.
The method of claim 1,
The core sound absorbing portion is disposed along the exhaust sound absorbing body, is located at the center upper and lower portions of the plurality of cylindrical sound absorbing portions, and includes a plurality of core sound absorbing plates having the basalt sound absorbing material,
On both sides between the plurality of core sound absorbing plates, a resonance opening communicating with the plurality of cylindrical sound absorbing portions is provided, characterized in that by applying a basalt sound absorbing material to enhance heat resistance and reduce noise in the low frequency band. Eco-friendly hybrid silencer for marine engines.
The method of claim 6,
The plurality of cylindrical sound absorbing parts,
a first cylindrical sound absorbing part located in the front part of the exhaust sound absorbing body; and
Eco-friendly for marine engines capable of strengthening heat resistance and reducing noise in the low frequency band by applying basalt sound absorbing material, characterized in that it comprises a second cylindrical sound absorbing part spaced apart from the first cylindrical sound absorbing part and located from the center to the rear part of the exhaust sound absorbing body. hybrid silencer.
The method of claim 1,
The spark arrestor,
a cylindrical arrestor body corresponding to the inlet of the exhaust sound absorbing body;
a circulating flow unit coupled to the arrestor body to form a circulating flow towards the inlet side of the exhaust sound absorbing body, and having a plurality of circulating blades and a shaft; and
A vessel capable of strengthening heat resistance and reducing noise in the low frequency band by applying a basalt sound absorbing material, characterized in that it includes a dust storage unit coupled to the outer circumference of the arrestor body and storing exhaust dust of the exhaust gas circulated by the circulating flow unit. Eco-friendly hybrid silencer for engine.
The method of claim 1,
The basalt sound absorbing material,
Further comprising a ceramic resin combining the basalt wool and the basalt fabric or silica fabric and coupling the basalt sound absorbing material to the exhaust sound absorbing body,
Eco-friendly hybrid silencer for ship engines capable of enhancing heat resistance and reducing noise in the low frequency band by applying basalt sound absorbing material, characterized in that the basalt wool is disposed inside the exhaust sound absorbing body rather than the basalt fabric or silica fabric.
The method of claim 1,
Eco-friendly for marine engines capable of enhancing heat resistance and reducing noise in the low frequency band by applying a basalt sound absorbing material, characterized in that it further comprises a splitter provided in a triangular cross-sectional shape at the outlet side of the exhaust sound absorbing body and disposed in the radial direction of the exhaust sound absorbing body. hybrid silencer.

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