KR102240036B1 - Fluid silencer having multi-side branch on sound absorbing material - Google Patents

Abstract

The present invention relates to a fluid silencer of a sound absorption method for reducing a noise through fluid containing seawater or oil, which reduces the noise transmitted through the fluid by the sound absorption material and additionally reduces the noise by forming a side branch on the outside of the sound absorption material in a multiple type, thereby reducing the noise of a high frequency band transmitted through the fluid by the sound absorption material and reducing the noise for each low frequency band by the multi-side branch. Moreover, the present invention minimizes an increase in an area of the sound absorption material by the multi-side branch formed on the sound absorption material so as to design and manufacture the fluid silencer at a proper size.

Description

Fluid silencer with multiple side branches formed on sound absorbing material {FLUID SILENCER HAVING MULTI-SIDE BRANCH ON SOUND ABSORBING MATERIAL}

The present invention relates to a fluid silencer, and more specifically, a fluid in which a multi-side branch is formed on a sound absorbing material in a fluid silencer having a sound-absorbing structure for reducing noise through a fluid such as seawater or oil. It's about a silencer.

In general, power plants, main engines, ventilation systems, etc., have many pipes installed as passages for moving fluid, and if these pipes correspond to the paths that transmit noise, devices for reducing the noise of these pipes are generally used as silencers. It is called (Silencer).

These silencers can be largely divided into absorption, reflection, interference, and resonance types according to their structure and function. Specifically, the absorption and absorption silencer consists of several partition spaces, partially perforated noise pipes, and porous sound-absorbing materials. It is a structure that reduces noise by introducing fluid into the sound absorbing material charged in the partition space through the hole drilled in the partition. In addition, the reflective silencer is a structure that reduces noise through impact reflection by arranging several spaces in a row and installing through pipes in partitions forming each space to block the path of fluid several times. In addition, the interference type silencer is a structure that reduces noise by weakening fluid energy from a structure that repeats branching and assembly of pipes. In addition, the resonance type silencer is a structure that reduces noise using the Helmholtz resonance principle by forming a multi-branched resonator in a size and shape suitable for a specific frequency.

1 is a view showing an installation state of a suction silencer installed in an air supply pipe of an engine for power generation according to the prior art, and FIG. 2 is a cross-sectional view of a suction silencer according to the prior art.

As shown in Figure 1, a suction silencer 13 is installed between the power generation engine 11 and the air supply pipe 12 according to the prior art, this suction silencer 13, the engine ( 11) is configured to have a circular housing 21, as shown in FIG. 2, so that the circular air supply pipe 22 directly connected to it can be connected, and the plate-shaped sound-absorbing plates 22 are therein. It is installed while maintaining a predetermined distance so as to secure a fluid passage.

However, in the case of a suction silencer according to the prior art, as shown in FIG. 2, when configuring the suction silencer 20 having a circular housing 21, the circular housing of the suction silencer 20 ( In response to 21), the shape of the sound-absorbing plate 22 configured therein is changed for each location to be individually manufactured in various forms.

Meanwhile, a number of fans are used in air conditioning systems for ships or offshore structures. When these fans operate, noise is generated, which has a significant impact on adjacent areas. In order to reduce the fan noise, a sound-absorbing silencer is mainly used. In particular, when considering the main RPM and the number of blades of the fan used in the air conditioning system of ships or offshore structures, the main frequency band of the fan noise is a low frequency band of 250 Hz or less.

On the other hand, sound-absorbing materials used in sound-absorbing silencers, for example, made of mineral wool or glass wool, have low sound-absorbing performance in the low frequency band of 250 Hz or less, making it difficult to expect a large reduction effect. There is a problem.

In order to improve the noise reduction performance in the low frequency band below 250㎐, a resonant silencer using a side branch or a Helmholtz resonator is widely used, but in the case of a resonance silencer, low frequency noise having a certain band is reduced. It is known that there is a limit to this, and the side branch is known to have an effect of reducing noise corresponding to a 1/4 wavelength.

Specifically, when the wavelength of the noise generated by the installation of the side branch is 4L, the noise can be reduced by installing the side branch having a predetermined length (L). This side branch type silencer is a device that is fastened on a duct or flow path to induce an inverse phase to cancel noise, and can be effectively used to reduce noise at a specific frequency.

3 is a perspective view of a general side branch type silencer.

As shown in Figure 3, a general side branch type silencer 40 is composed of an inlet pipe 41, a resonance tube 42, and an outlet pipe 43, and the inlet pipe 41 is connected to an engine, etc. It serves to guide the supplied intake gas or exhaust gas discharged from the engine to the resonance tube 42, and is mounted on one side of the resonance tube 42, and communicates with the space inside the resonance tube 42. In addition, the outlet pipe 43 is mounted on the other side of the resonance tube 42, communicates with the space inside the resonance tube 42, and guides exhaust gas to the outside of the resonance tube 42.

The resonance tube 42 may be formed in an approximately hollow cylindrical shape, and a predetermined amount of space is provided therein. This space portion resonates the air flow introduced through the inlet pipe 41 to reduce engine operating noise and noise due to the flow of intake and exhaust gas to a predetermined degree.

In this case, the inlet pipe 41 may be mounted such that one end of the inlet pipe 41 protrudes toward the inside of the resonance tube 42 by a predetermined degree. That is, one end of the inlet pipe 41 is mounted so as to protrude a predetermined length into the space portion inside the resonance tube 42, and at this time, a portion where one end of the inlet pipe 41 protrudes into the space portion is referred to as a neck 41a. The neck 41a is for adjusting the frequency resonated in the resonant cylinder 42, and the resonant frequency may vary according to the length L of the neck 41a.

However, in the case of a general side branch type silencer 40, noise reduction is possible only at a specific frequency, so it is difficult to expect a noise reduction effect in a multi-band range. In order to expand the noise reduction frequency range, a number of side branch type silencers There was a problem of complicating the structure of the device by using.

On the other hand, as a prior art for solving the problem of the above-described side branch type silencer, Korean Patent No. 10-1334311 discloses an invention entitled "side branch type silencer". This will be described with reference to FIGS. 4A and 4B.

4A is a perspective view of a side branch type silencer capable of reducing noise in a multi-band frequency range according to the prior art, and FIG. 4B is a side cross-sectional view of a side branch type silencer capable of reducing noise in a multi-band frequency range according to the related art. .

4A and 4B, the side branch type silencer 50 capable of reducing noise in a multi-band frequency range according to the prior art includes an inlet pipe 51, a resonance vessel 52, and an outlet pipe 53. Can include.

The inlet pipe 51 is connected to the engine and the like to guide the intake and exhaust gas into the resonance tube 52, and is mounted on one side of the resonance tube 52 to communicate with the space inside the resonance tube 52. In addition, the inlet pipe 51 has one end protruding into the resonance tube 52 to form a neck 51a. In this case, in the side branch type silencer 50 capable of reducing noise in a multi-band frequency range according to the prior art, the end of the neck 51a may be formed to be inclined at a predetermined angle.

The outlet pipe 53 is mounted on the other side of the resonance tube 52 and communicates with the space portion inside the resonance tube 52. The outlet pipe 53 guides the intake and exhaust gas flowing into the resonance tube 52 through the inlet tube 51 back to the outside of the resonance tube 52. In this case, the intake gas discharged through the outlet pipe 53 may be supplied to the engine, and the exhaust gas discharged through the outlet pipe 53 may be discharged to the outside.

In addition, one end of the inlet pipe 51 may be formed to be inclined at a predetermined angle. Specifically, the inlet pipe 51 may have an inclined end 51b by cutting an end of the neck 51 disposed in the space portion inside the resonance tube 52 to be inclined at a predetermined angle.

Due to this inclined end 51b, the length of the neck 51a may be formed to have a first length L1 and a second length L2. That is, on one side of the inclined end 51b, the length of the neck 51a is formed with the shortest length L1, and on the other side of the inclined end 51b, the length of the neck 51a is the longest second. It may be formed in length L2.

Accordingly, the first and second lengths L1 and L2 may correspond to frequencies resonated in the resonance container 52, respectively. Specifically, the first frequency corresponding to the first length L1 is resonated in the portion where the length of the neck 51a is formed with the first length L1, and the second length in the portion formed with the second length L2 The second frequencies corresponding to each resonate. As a result, a resonance phenomenon may occur in the first to second frequency ranges, and thus, noise in the first to second frequency ranges may be reduced.

However, in the case of the side branch type silencer 50 capable of reducing noise in a multi-band frequency range according to the prior art, as a side branch type silencer of a resonance type having a resonance tube 52, reduction of transmitted sound through air Although it can be used as a device, there is a problem that it is difficult to use for fluids such as seawater or oil.

In other words, a silencer is widely used as a device for reducing sound transmitted through air, and various structures have been developed, but the development of a fluid silencer used for seawater or oil is still insufficient.

That is, in the case of seawater or oil, it exhibits different transmission characteristics than in air due to different density and inelastic characteristics from air, and in order to develop a silencer used for such seawater or oil, the characteristics of these fluid media must be considered.

Specifically, a fluid silencer is for reducing noise transmitted through a fluid, and in most cases has a sound-absorbing structure that is reduced by using a sound absorbing material. Here, the sound-absorbing material for a fluid silencer needs a degree of rigidity that can maintain its shape against the pressure of the fluid, so a polyurethane-based material is used instead of a general sound-absorbing material.

On the other hand, as a general fluid silencer, it is known to attenuate noise by using impedance mismatch using a simple expansion tube or to attenuate noise by attaching a sound absorbing material inside the silencer, but these methods reduce noise in a relatively high frequency region. It is effective, but it is known that it is difficult to attenuate the narrowband components of the low frequency band, such as a seawater pump.

As a prior art for solving the above-described problem, Korean Patent No. 10-1412075 discloses an invention entitled “active fluid silencer”, which will be described with reference to FIG. 5.

5 is a cross-sectional view showing an active fluid silencer according to the prior art.

5, an active fluid silencer according to the prior art. A housing 62 formed in a cylindrical shape larger than the diameter of the pipe 61 so as to have a space therein and surrounding the outer circumferential surface of the pipe 61; The first sensor 66 is installed inside the housing 62. A sound absorbing material 63 filled in the housing 62 to fix the second sensor 67 and the piezoelectric element 65; In order to detect the incident wave (W1) propagated into the active fluid silencer and the reflected wave (W2) reflected from the housing 62, the first is disposed between the sound absorbing material 63 and the housing 62, respectively. A sensor 66 and a second sensor 67; And a piezoelectric element 65 configured to output a sound wave having an inverse phase with respect to the incident wave W1.

The incident wave W1 incident on the piezoelectric element 65 and the reflected wave W2 reflected by using the detection signal output from the first sensor 66 and the second sensor 67 are formed to be separated, and the piezoelectric element ( 65) includes a control unit 64 provided to output a control signal related to the incident wave (W1) so as to output a sound wave.

Fluids such as seawater and fresh water flow through the inner space of the pipe 61, and noise generated in this process can be analyzed by the first sensor 66, the second sensor 67, and the control unit 64. , The control unit 64 generates a sound wave having an inverse phase of the noise propagating along the inside of the piezoelectric element 65, the pipe 61.

According to the active fluid silencer according to the prior art, the noise propagated as the fluid flows along the pipe is detected by the first sensor 66, the second sensor 67, and the controller 64, so that the controller 64 By allowing the piezoelectric element 65 to generate a sound wave having a phase opposite to that of the propagating noise, noise propagating along the fluid inside the pipe 61 can be controlled in real time to mitigate the noise propagating to the outside.

However, in the case of an active fluid silencer according to the prior art, since the first sensor 66, the second sensor 67, the control unit 64, and the piezoelectric element 65 must be provided, the structure becomes complicated and maintenance There is a difficult problem.

After all, in the case of a fluid silencer using a sound-absorbing material according to the prior art, it is difficult to expect a noise reduction effect beyond the characteristics of the sound-absorbing material, so it is necessary to secure the performance more than the sound-absorbing material through a complex element. Furnaces include expansion, resonance, and interference.

This fluid silencer is difficult for the user to design for noise reduction characteristics due to the reduction method through the sound absorbing material, and accordingly, the target reduction amount was satisfied by adjusting the area or length of the sound absorbing material for the fluid silencer in order to optimize the design of the fluid silencer. However, this method has a problem in that when the noise reduction effect of a specific band is insufficient, the size may be unnecessarily increased because only the corresponding band cannot be supplemented.

Korean Patent Registration No. 10-1412075 (Registration Date: June 19, 2014), Invention Title: "Active Fluid Silencer" Korean Patent Registration No. 10-1334311 (Registration Date: November 22, 2013), Invention Title: "Side Branch Type Silencer" Republic of Korea Patent No. 10-2060463 (registration date: December 23, 2019), title of invention: "silencer and maintenance method of the silencer" Republic of Korea Patent No. 10-1816020 (registration date: January 2, 2018), title of invention: "Variable RPM fan noise reduction device" Republic of Korea Patent Registration No. 10-345155 (Registration Date: July 5, 2002), Title of Invention: "Side Branch Device for Reducing Intake Noise" Republic of Korea Patent No. 10-0632419 (Registration date: September 28, 2006), Invention title: "Sound absorption resonance type silencer"

The technical problem to be achieved by the present invention for solving the above-described problems is to reduce the noise transmitted through the fluid by the sound absorbing material in the sound-absorbing fluid silencer for reducing noise through a fluid including seawater or oil, It is to provide a fluid silencer in which multiple side branches are formed on the sound-absorbing material, which can further reduce noise by forming multiple side branches on the outside of the sound-absorbing material.

Another technical problem to be achieved by the present invention is to provide a fluid silencer in which multiple side branches are formed on the sound absorbing material, which can design and manufacture a fluid silencer in an optimal size by minimizing the increase in the area of the sound absorbing material by the multiple side branches formed on the sound absorbing material. It is to do.

As a means for achieving the above-described technical problem, the fluid silencer in which the multiple side branches according to the present invention are formed on the sound absorbing material is used in a sound absorbing fluid silencer for reducing noise transmitted through a fluid containing seawater or oil. In the inner housing, the sound-absorbing material is installed on the inner circumferential surface; A housing forming a hollow body of the fluid silencer; A sound-absorbing material attached to the inner circumferential surface of the inner housing installed on the inner circumferential surface of the hollow outer housing to reduce noise transmitted by the fluid; Multiple side branches formed on the outer circumferential surface of the sound absorbing material at different depths to further reduce noise transmitted by the fluid; An inner rubber film coupled to the inner surface of the sound absorbing material to protect the sound absorbing material; And a housing flange disposed on the fluid inlet side and fastened to the outer housing, wherein the sound-absorbing material reduces high-frequency noise transmitted by the fluid, and the multiple side branches reduce low-frequency noise transmitted by the fluid. It is characterized in that it is reduced for each frequency band.

Here, the multiple side branches may be multiplely formed at different depths for each predetermined frequency band of noise transmitted through the fluid.

Here, the side branches that are multiplely formed at different depths can reduce noise in a low frequency band of 250 Hz or less, each corresponding to a 1/4 wavelength.

Here, the sound-absorbing material is formed of a polyurethane-based porous material, and multi-side branches having a predetermined depth on the outer circumferential surface of the sound-absorbing material for each predetermined frequency band of noise transmitted through the fluid are formed in advance according to the design dimensions. It is characterized.

The fluid silencer having multiple side branches formed on the sound absorbing material according to the present invention may further include a gasket inserted between the outer housing and the housing flange for sealing.

Meanwhile, the fluid silencer having multiple side branches formed on the sound absorbing material according to the present invention is a fluid silencer of a sound absorption method for reducing noise transmitted through a fluid including seawater or oil, wherein the hollow body of the fluid silencer is A housing to form; A sound-absorbing material installed in the center of the hollow housing in a cone shape to reduce noise transmitted by the fluid; A multi-side branch formed on the outer circumferential surface of the cone-shaped sound absorbing material at different depths to further reduce noise transmitted by the fluid; And a housing flange disposed on the fluid inlet side and fastened to the outer housing, wherein the cone-shaped sound absorbing material reduces high-frequency noise transmitted by the fluid, and the multiple side branches are low-frequency noise transmitted by the fluid. It is characterized in that each is reduced for each predetermined frequency band.

According to the present invention, in a sound-absorbing fluid silencer for reducing noise through a fluid containing seawater or oil, noise transmitted through the fluid is reduced by the sound-absorbing material, and side branches are formed on the outside of the sound-absorbing material. May be further reduced, and thus, noise in the high-frequency band transmitted through the fluid may be reduced by the sound-absorbing material, and noise for each low-frequency band may be reduced by multiple side branches.

According to the present invention, it is possible to design and manufacture a fluid silencer with an optimum size by minimizing the increase in the area of the sound absorbing material by multiple side branches formed on the sound absorbing material.

1 is a view showing the installation state of the suction silencer installed in the air supply pipe of the engine for power generation according to the prior art.
Figure 2 is a cross-sectional view of a suction silencer according to the prior art.
3 is a perspective view of a general side branch type silencer.
4A is a perspective view of a side branch type silencer capable of reducing noise in a multi-band frequency range according to the prior art, and FIG. 4B is a side cross-sectional view of a side branch type silencer capable of reducing noise in a multi-band frequency range according to the related art. .
5 is a cross-sectional view showing an active fluid silencer according to the prior art.
6 is a perspective view illustrating a fluid silencer in which multiple side branches are formed on a sound absorbing material according to an embodiment of the present invention.
7 is a perspective view illustrating a sound-absorbing material in which multiple side branches are formed in a fluid silencer in which multiple side branches are formed on a sound-absorbing material according to an embodiment of the present invention.
8 is a diagram illustrating a state in which a fluid silencer in which multiple side branches are formed on a sound absorbing material according to an embodiment of the present invention is installed.
9 is a cross-sectional view illustrating a fluid silencer in which multiple side branches are formed on a sound absorbing material according to an exemplary embodiment of the present invention.
10 is a view showing multiple branches formed on the sound absorbing material in a fluid silencer in which multiple side branches are formed on the sound absorbing material according to an embodiment of the present invention.
11 is a cut-away perspective view showing a fluid silencer in which multiple side branches are formed on a sound absorbing material according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

[Fluid silencer 100 with multiple side branches formed on the sound absorbing material]

6 is a perspective view showing a fluid silencer in which multiple side branches are formed on a sound absorbing material according to an embodiment of the present invention, and FIG. 6A is a left perspective view, FIG. 6B is a right perspective view, and FIG. 7 is a view It is a perspective view showing a sound absorbing material in which multiple side branches are formed in a fluid silencer in which multiple side branches are formed on a sound absorbing material according to an embodiment of the present invention.

6 and 7, the fluid silencer 100 having multiple side branches formed on a sound absorbing material according to an embodiment of the present invention is a sound absorbing method for reducing noise transmitted through a fluid containing seawater or oil. It is installed between the pipe or the flow path through which the fluid flows, as a fluid silencer of the inner housing 110, the outer housing 120, the inner rubber membrane 130, the sound absorbing material 140, the multi-side branch 150 , A housing flange 160 and a gasket 170.

In the inner housing 110, the sound absorbing material 140 is installed on the inner surface, the inner housing 110 is installed on the inner surface of the outer housing 120, and the outer housing 120 is a fluid silencer according to an embodiment of the present invention. To form a hollow body.

The sound absorbing material 140 is attached to the inner circumferential surface of the inner housing 110 installed on the inner circumferential surface of the hollow outer housing 120 to reduce noise transmitted by the fluid. Here, the sound-absorbing material 140 is formed of a polyurethane (Poly-Urethane)-based porous material, and at this time, multiple sides having a predetermined depth on the outer circumferential surface of the sound-absorbing material 140 for each predetermined frequency band of noise transmitted through the fluid The branch 150 is formed in advance according to the design dimensions.

As shown in FIG. 7, the multiple side branches 150 are formed in multiples at different depths on the outer circumferential surface of the sound absorbing material 140 to further reduce noise transmitted by the fluid. Here, the multiple side branches 150 are multiplely formed at different depths for each predetermined frequency band of noise transmitted through the fluid, and the side branches 150 are multiplely formed at different depths, each having a length of 1/ It can reduce the noise in the low frequency band below 250㎐ corresponding to 4 wavelengths. In other words, the side branch 150 is designed to have a length of 1/4 of the wavelength of the target frequency to be reduced and induces the occurrence of an inverse phase, thereby reducing noise based on a principle that cancels the target frequency of the original sound.

The inner rubber film 130 is coupled to the inner surface of the sound absorbing material 140 to protect the sound absorbing material 140.

In addition, the housing flange 160 is disposed on the fluid inlet side and fastened to the outer housing 120 as shown in FIG. 9 to be described later.

The gasket 170 is inserted between the outer housing 120 and the housing flange 160 for sealing.

Accordingly, the sound absorbing material 140 may reduce high-frequency noise transmitted by the fluid, and the multi-side branch 150 may reduce low-frequency noise transmitted by the fluid for each predetermined frequency band.

On the other hand, FIG. 8 is a diagram illustrating a state in which a fluid silencer in which multiple side branches are formed on a sound absorbing material according to an embodiment of the present invention is installed.

As shown in FIG. 8, the fluid silencer 100 having multiple side branches formed on the sound absorbing material according to the embodiment of the present invention is installed on a fluid pipe 210 or a flow path through which a fluid including seawater or oil flows. In this case, the fluid pipe 210 may be installed between the pump 220 and the suction port/discharge port.

In the case of the fluid silencer according to the embodiment of the present invention, by forming multiple side branches 150 on the sound absorbing material 140 of the sound-absorbing fluid silencer, it is possible to design for each frequency band suitable for the purpose of use. In addition, when the fluid silencer is installed, it is possible to optimize the size of the existing fluid silencer, which was dependent only on the characteristics of the sound absorbing material 140, by enabling a design to supplement the performance of the band of interest. At this time, it basically has a sound-absorbing part using the sound-absorbing material 140, and by applying the side branch 150 to the sound-absorbing part for a design to supplement the performance, the performance of the fluid silencer can be supplemented, and the size can be reduced.

Meanwhile, FIG. 9 is a cross-sectional view showing a fluid silencer in which multiple side branches are formed on a sound-absorbing material according to an embodiment of the present invention, and FIG. 9A is a cross-sectional view showing the front side, and FIG. 9B is a side cross-sectional view. 9C is a cross-sectional view showing the rear surface.

Referring to FIG. 8, the fluid silencer 100 having multiple side branches formed on the sound absorbing material according to an embodiment of the present invention includes an inner housing 110, an outer housing 120, an inner rubber film 130, and a sound absorbing material ( 140) and multiple side branches 150, and also, as shown in Fig.9 a) to c), the housing flange 160, the gasket 170, the inner screw screw 180 and the outer screw screw (190) may be included.

In the case of the fluid silencer 100 in which multiple side branches are formed on the sound absorbing material according to the embodiment of the present invention, as shown in a) and c) of FIG. 9, the sound absorbing material is 140 may be coupled to be attached to the inner circumferential surface of the housing. In addition, 16 outer screw screws 190 can be used to fasten the housing flange 160 to the outer housing 120, at this time, the gasket 170 when the housing flange 160 and the outer housing 120 are fastened. Sealing can be done by using.

Meanwhile, FIG. 10 is a view showing multiple branches formed on the sound absorbing material in a fluid silencer in which multiple side branches are formed on the sound absorbing material according to an exemplary embodiment of the present invention.

In the case of a fluid silencer in which multiple side branches according to an embodiment of the present invention are formed on a sound absorbing material, as shown in FIG. 10a), multiple side branches having different depths at four positions on the outer circumferential surface of the sound absorbing material 140 (150a, 150b, 150c, 150d) may be formed. Specifically, in the case of a fluid silencer in which the multiple side branches 150 are formed on the sound-absorbing material 140, four side branches 150 can be inserted and formed, and each is designed to have a different depth to reduce a different target frequency. By doing so, it is possible to reduce noise in various frequency bands. That is, since the noise reduction band is narrow due to the characteristics of the side branch, the fluid silencer can be optimized by designing and arranging multiple side branches to improve noise reduction in various bands.

In addition, as shown in b) of Figure 10, forming multiple side branches (150a, 150b, 150c, 150d, 150e, 150f, 150g, 150h) each having a different depth at eight locations on the outer circumferential surface of the sound absorbing material 140 It can be done, but it is not limited to this.

In other words, the typical noise reduction method of the fluid silencer is the sound absorption effect through the sound absorbing material 140 inserted inside the silencer, and the structure of the multi-side branch 150 to improve the reduction performance of the fluid silencer 100 in the frequency band of interest. Was applied to the sound-absorbing material 140. Through this, it is possible to improve the somewhat insufficient noise reduction performance in the mid-frequency or higher band, and also to reduce the reduction effect for the low-frequency band that requires additional noise reduction effect by changing the design dimensions of the multiple-formed side branch 150. Can be improved.

The fluid silencer 100 having multiple side branches formed on the sound absorbing material according to an embodiment of the present invention includes an inner housing 110, an outer housing 120, a polyurethane-based sound absorbing material 140, and an inner side for protecting the sound absorbing material. As a sound-absorbing fluid silencer having a structure of a rubber film 130, by forming multiple side branches 150 on the outside of the sound-absorbing material 140, improved noise reduction performance is secured through an additional noise reduction factor compared to the general sound-absorbing material. can do.

Meanwhile, FIG. 11 is a cut-away perspective view showing a fluid silencer in which multiple side branches are formed on a sound absorbing material according to another embodiment of the present invention, and illustrates a case where a sound absorbing cone is installed in the center of a housing.

The fluid silencer 100 ′ having multiple side branches formed on the sound-absorbing material according to another embodiment of the present invention has a cone-shaped sound-absorbing material 140 ′ installed in the center of the outer housing 120 as shown in FIG. 11. It is shown that the multiple side branches 150 are formed on the outer circumferential surface of the cone-shaped sound absorbing material 140 ′, respectively, by various depths d.

Specifically, as shown in FIG. 11, the fluid silencer 100 ′ having multiple side branches formed on the sound absorbing material according to another embodiment of the present invention reduces noise transmitted through a fluid containing seawater or oil. In the fluid silencer of the sound-absorbing method for making, the outer housing 120 forming a hollow body of the fluid silencer; A cone-shaped sound absorbing material (140') installed in the center of the hollow housing (120) in a cone shape to reduce noise transmitted by the fluid; Multiple side branches 150 formed on the outer circumferential surface of the cone-shaped sound absorbing material 140' at different depths to further reduce noise transmitted by the fluid; And a housing flange 160 fastened to the outer housing 120, wherein the cone-shaped sound absorbing material 140 ′ reduces high-frequency noise transmitted by the fluid, and the multi-side branch 150 Low-frequency noise transmitted by the fluid may be reduced for each predetermined frequency band.

As a result, according to an embodiment of the present invention, in a sound-absorbing fluid silencer for reducing noise through a fluid containing seawater or oil, noise transmitted through the fluid is reduced by the sound-absorbing material, and a side branch on the outside of the sound-absorbing material. The noise may be further reduced by multiplex formation, and thus, noise in the high-frequency band transmitted through the fluid may be reduced by the sound absorbing material, and noise for each low-frequency band may be reduced by multiple side branches. In addition, by minimizing the increase in the area of the sound-absorbing material by the multiple side branches formed on the sound-absorbing material, it is possible to design and manufacture a fluid silencer in an optimal size.

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

The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

100: fluid silencer
110: inner housing 120: outer housing
130: inner rubber membrane 140: sound absorbing material
140': cone-shaped sound absorbing material
150: multiple side branch 160: outer housing flange
170: gasket 180: inner screw thread
190: external screw thread
210: fluid piping 220: pump

Claims (8)

In the sound-absorbing fluid silencer (Fluid Silencer) for reducing the noise transmitted through the fluid containing seawater or oil,
An inner housing 110 in which the sound absorbing material 140 is installed on the inner circumferential surface;
An outer housing 120 forming a hollow body of the fluid silencer;
A sound absorbing material 140 attached to the inner circumferential surface of the inner housing 110 installed on the inner circumferential surface of the hollow outer housing 120 to reduce noise transmitted by the fluid;
Multiple side branches 150 formed on the outer circumferential surface of the sound absorbing material 140 at different depths to further reduce noise transmitted by the fluid;
An inner rubber film 130 coupled to the inner surface of the sound absorbing material 140 to protect the sound absorbing material 140; And
Includes a housing flange 160 disposed on the fluid inlet side and fastened to the outer housing 120, wherein the sound absorbing material 140 reduces high-frequency noise transmitted by the fluid, and the multi-side branch 150 A fluid silencer having multiple side branches formed on a sound absorbing material, characterized in that the low-frequency noise transmitted by the fluid is respectively reduced for each predetermined frequency band. The method of claim 1,
The multiple side branch 150 is a fluid silencer having multiple side branches formed on a sound absorbing material, characterized in that the multiple side branches 150 are formed at different depths for each predetermined frequency band of the noise transmitted through the fluid. The method of claim 2,
The multiple side branches 150 formed at different depths each have a length of 1/4 wavelength and reduce noise in a low frequency band of 250 Hz or less. silencer. The method of claim 1,
The sound-absorbing material 140 is formed of a polyurethane-based porous material, and a multi-side branch 150 having a predetermined depth on the outer circumferential surface of the sound-absorbing material 140 for each predetermined frequency band of noise transmitted through the fluid. A fluid silencer in which multiple side branches are formed on the sound absorbing material, characterized in that the) is formed in advance according to the design dimensions. The method of claim 1,
A fluid silencer formed on a sound-absorbing material with multiple side branches further comprising a gasket 170 inserted between the outer housing 120 and the housing flange 160 for sealing. In the sound-absorbing fluid silencer for reducing noise transmitted through a fluid containing seawater or oil,
An outer housing 120 forming a hollow body of the fluid silencer;
A cone-shaped sound absorbing material (140') installed in the center of the hollow outer housing 120 in a cone shape to reduce noise transmitted by the fluid;
Multiple side branches 150 formed on the outer circumferential surface of the cone-shaped sound absorbing material 140' at different depths to further reduce noise transmitted by the fluid; And
It includes a housing flange 160 disposed on the fluid inlet side and fastened to the outer housing 120,
The cone-shaped sound absorbing material 140 ′ reduces high-frequency noise transmitted by the fluid, and the multi-side branch 150 reduces low-frequency noise transmitted by the fluid for each predetermined frequency band. A fluid silencer in which multiple side branches are formed on the sound absorbing material. The method of claim 6,
The multiple side branch 150 is a fluid silencer having multiple side branches formed on a sound absorbing material, characterized in that the multiple side branches 150 are formed at different depths for each predetermined frequency band of noise transmitted through the fluid. The method of claim 7,
The side branches 150 that are multiplely formed at different depths are a fluid silencer having multiple side branches formed on the sound absorbing material, characterized in that they reduce noise in a low frequency band of 250 Hz or less each corresponding to a 1/4 wavelength .

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