KR20220145560A - Intake and exhaust silencer for Oxygen concentrators - Google Patents

Abstract

The present invention relates to an intake and exhaust silencer for an oxygen concentrator, comprising an outer case (100) and a noise reducing means (200) provided in the outer case (100) and having an intake part (20) and an exhaust part (30). According to the silencer of the present invention, since a relative change in the flow rates of intake and exhaust air is small, overloading is not caused, and the air intake and exhaust noise generated by a connected mechanical device and the driving noise and pulsation noise due to the driving pressure can be greatly reduced to zero noise.

Description

Intake and exhaust silencer for Oxygen concentrators

The present invention relates to a silencer, and more particularly, air intake/exhaust noise and driving noise caused by pressure pulsation generated in a mechanical device that sucks air and compresses air to discharge oxygen and nitrogen, such as a compressor used in an oxygen generator, etc. It relates to an intake/exhaust silencer for an oxygen generator that prevents living noise by reducing the amount of noise sensed from the outside by increasing the pulsating noise absorption rate as much as possible, or by allowing it to be recognized as noiseless.

With industrialization, air quality contains a lot of components that are harmful to the human body. In particular, in recent years, not only harmful gases, but also respiratory diseases and skin diseases are occurring a lot due to fine dust. Accordingly, modern people require a pleasant and clean environment, and various air conditioning devices, ie, oxygen generators or air purifiers, are being researched and developed to make the room comfortable.

Among them, the oxygen generator is a device that sucks air using a compressor and passes the sucked air through an oxygen-nitrogen separation filter such as a PSA filter, a UFL filter, and a membrane filter to generate high concentration of oxygen. It is a separate form.

However, the conventional oxygen generator has a problem in arranging it indoors due to noise and heat generated by the compressor during air intake/compression/discharge, so it is usually installed outdoors. Here, the compressor is an air compression device that sucks air, compresses the sucked air, and sends it to the oxygen and nitrogen separation filter. When the compressor is driven, heat and noise are generated while compressing the air. Copper loss occurring in the energized part of the compressor motor by Occurs according to pressure pulsations along with vibrations at the motor rotational frequency of the compressor motor.

In addition, in the conventional oxygen generator, in order to prevent such heat generated by the compressor, an air cooling method using at least two external fans in addition to the internal fan provided in the compressor itself is mainly used, but the air cooling method using an external fan is mainly used. There is a problem of noise generated from the fan by discharging the air flowing into one fan to the outside through the other fan.

In order to prevent such noise, Patent Publication No. 10-2009-0105703 discloses a casing filled with a soundproofing material on the edge for soundproofing and sound absorption; A resonant chamber and an expansion chamber are connected to a suction pipe for inducing outside air inside the casing and are partitioned by a partition wall, and are supported by a perforated plate, and a sound-absorbing mesh to reduce the noise of the air passing through the expansion chamber and to attract the air. This is installed, and there is a pair of silencers consisting of a sound absorption chamber equipped with a sound absorption tube provided with many holes to communicate with the mesh. An air purifier equipped with a silencer has been introduced, which is provided with a seating portion to which the tube is detachably coupled, and has a detachable portion from which the connecting tube of the filter assembly is detachably provided at the inlet side of the other silencer.

However, the conventional silencer having such a configuration does not reduce noise due to pressure pulsation discharged from the compressor in the resonance chamber, the expansion chamber, and the sound absorption chamber, so that the pulsating noise is discharged to the outside as it is. Moreover, due to the structure of the air flow path, there is a problem in that the amount of air supplied to the compressor is small, so that a load is applied to the compressor, resulting in an overload, and the amount of noise is further increased.

Accordingly, the present applicant has repeatedly studied to solve such a problem, and the relative change in the intake and exhaust air flow rate is small, so that the air intake and exhaust noise generated from the connected mechanical device and the driving noise and pulsation caused by the driving pressure are not overloaded. An intake and exhaust silencer for oxygen generators that significantly reduced noise was developed.

The first object of the present invention is to reduce the relative change in the flow rate of intake and exhaust air, so that the air intake and exhaust noise generated from the connected mechanical device and the driving noise and pulsating noise caused by the driving pressure are remarkably silent without being overloaded. An object of the present invention is to provide a reduced intake and exhaust silencer for an oxygen generator.

In addition, a second object of the present invention is to reduce the noise of an oxygen generator disposed in a hospital or indoors to provide a user with comfort and quiet conditions for using the machine.

An intake and exhaust silencer for an oxygen generator according to the present invention for achieving this technical problem,

an outer case 100 comprising a body 11 and a front cap 12 having a pair of coupling holes 12a and 12b formed therein; and

It is provided in the outer case 100, the noise reduction means 200 having an intake part 20 and an exhaust part 30;

The outer case 100 is composed of a first chamber 110 and a second chamber 120 communicating at the rear end, and the first chamber 110 and the second chamber 120 are in the longitudinal direction of the outer case. It is characterized in that it is formed by the partition wall (13) formed of.

In addition, in the intake and exhaust silencer for an oxygen generator according to the present invention,

Between the rear end of the partition wall 13 and the inner rear surface of the case 100, a communication space 13a formed to be spaced apart from each other is provided, or

The rear end of the partition wall 13 and the inner rear surface of the outer case 100 are in contact with each other, but at the rear end of the partition wall 13 so that the first chamber 110 and the second chamber 120 communicate with each other. It is characterized in that a plurality of communication holes (13b) are provided.

In addition, in the intake and exhaust silencer for an oxygen generator according to the present invention,

The noise reduction means 200 includes an intake part 20 disposed in the first chamber 110 provided in the outer case 100 and an exhaust part 30 disposed in the second chamber 120 . characterized in that

In addition, in the intake and exhaust silencer for an oxygen generator according to the present invention,

The intake part 20,

intake pipe 21; a first sound absorbing pipe 22 having a predetermined length in which the front end is fitted into the intake pipe 21 or is connected to the rear end of the intake pipe 21 and has a plurality of through holes 22a formed on the side thereof; a first hollow sound-absorbing case 23 in which the first sound-absorbing tube 22 is disposed; and a sound-absorbing material 25 having a predetermined density filled in the inner space of the first sound-absorbing case 23 so as to surround the first sound-absorbing tube 22;

The exhaust unit 30,

exhaust pipe 31; a second sound absorbing pipe 32 having a front end fitted inside the exhaust pipe 31 or connected to the rear end of the exhaust pipe 31 and having a plurality of through holes 32a on the side thereof; a second hollow sound-absorbing case 33 in which the second sound-absorbing tube 32 is disposed; and a sound-absorbing material (35) having a predetermined density filled in the inner space of the second sound-absorbing case (33) to surround the second sound-absorbing tube (32).

In addition, in the intake and exhaust silencer for an oxygen generator according to the present invention,

The intake part 20 and the exhaust part 30 of the noise reduction means 200 are linked,

the noise of the air entering or exiting the machinery; or

It is characterized in that the air noise flowing into the mechanical device and the driving noise or pulsating noise flowing out from the mechanical device are reduced.

In addition, in the intake and exhaust silencer for an oxygen generator according to the present invention,

The distance between the ends of the intake part 20 and the exhaust part 30 and the inner rear surfaces of the first and second chambers in the outer case 100 is a communication between the first chamber and the second chamber. It is characterized in that it is 0.1 times to 5 times the length and width of the space.

In addition, in the intake and exhaust silencer for an oxygen generator according to the present invention,

The silencer for intake and exhaust, characterized in that it further comprises a noise reduction pipe (4) communicating with the connection portion to the mechanical device.

The intake and exhaust silencer for an oxygen generator according to the present invention has a small relative change in the intake and exhaust air flow rate, so that the noise generated from the connected mechanical device and the driving noise and pulsating noise caused by the driving pressure are remarkably silent without being overloaded. has a reducing effect.

In addition, the intake and exhaust silencer for an oxygen generator according to the present invention is applied to an air compressor and an oxygen supplier of an oxygen generator disposed indoors to maintain clean indoor air in a silent state and at the same time to supply clean oxygen.

1 is an external perspective view of an embodiment of an intake and exhaust silencer for an oxygen generator according to the present invention;
2 is an exploded perspective view showing the configuration of the outer case of the intake and exhaust silencer for an oxygen generator according to the present invention;
3 (a) and (b) are an internal schematic perspective view illustrating a modified form of the internal structure of the outer case of the intake/exhaust silencer for an oxygen generator according to the present invention;
4 is an exploded perspective view showing the noise reduction means of the intake and exhaust silencer for an oxygen generator according to the present invention;
5 is a cross-sectional view taken along line AA of FIG. 1 ;
Figure 6 is a perspective view of the coupling sequence showing the coupling relationship of the components of Figure 5;
7 (a), (b), (c) is a view schematically showing the coupling relationship between the intake and exhaust pipe and the sound absorption tube of the intake and exhaust silencer for an oxygen generator according to the present invention, and the structure of the intake and exhaust pipe integrally formed with the sound absorption tube;
8 is a cross-sectional view showing an internal structure according to another embodiment of the intake/exhaust silencer for an oxygen generator according to the present invention;
Figure 9 (a), (b), (c) is a perspective view showing an example of the structure of the sound absorption pipe used together with the intake and exhaust silencer for an oxygen generator according to the present invention.

The specific features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are based on the principle that the inventor can appropriately define the concept of the term in order to describe his invention in the best way to the technical idea of the present invention. It should be interpreted as a corresponding meaning and concept. In addition, it should be noted that, when it is determined that a detailed description of a known function and its configuration related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof is omitted.

1 is an external perspective view of an embodiment of an intake/exhaust silencer for an oxygen generator according to the present invention, FIG. 2 is an exploded perspective view showing the configuration of an outer case of an intake/exhaust silencer for an oxygen generator according to the present invention, FIGS. 3(a) and (b) ) is an internal schematic perspective view illustrating a modified form of the internal structure of the outer case of the intake and exhaust silencer for an oxygen generator according to the present invention, FIG. 4 is an exploded perspective view showing the noise reduction means of the intake and exhaust silencer for an oxygen generator according to the present invention, FIG. is a cross-sectional view taken along line AA of FIG. 1 , FIG. 6 is a perspective view of the coupling sequence showing the coupling relationship of the components of FIG. 5 , and FIGS. A view schematically showing the coupling relationship between the intake and exhaust pipe and the sound absorption tube and the structure of the intake and exhaust pipe integrally formed with the sound absorption tube. 9 (a), (b), (c) is a perspective view illustrating the structure of a sound absorption pipe used together with the intake and exhaust silencer for an oxygen generator according to the present invention.

1 to 8, the intake and exhaust silencer 1 for an oxygen generator according to an embodiment of the present invention includes an outer case 100; and a noise reduction means 200 having an intake part 20 and an exhaust part 30 .

The outer case 100 has a hollow cylindrical shape, and is composed of a case body 11 and a front cap 12 with an open front surface, and the inside of the case body 11 is a first having a predetermined dimension in the longitudinal direction of the case. It is divided into a chamber 110 and a second chamber 120, and the first chamber and the second chamber are configured to communicate at the rear end.

In the present invention, a partition wall 13 connected to the inner upper surface and inner lower surface of the case in the longitudinal direction of the case body 11 and spaced apart from the inner rear surface by a predetermined distance to form a communication space 13a is formed inside the case body 11, , the case 100 configured to communicate with the first chamber 110 and the second chamber 120 is illustrated.

Here, when the partition wall 13 and the inner rear surface of the case are spaced apart from each other by a predetermined distance, the air flow rate sucked from the intake unit 20 arranged in the first chamber 110 is the exhaust unit arranged in the second chamber 120 . In order to be introduced into the mechanical device (not shown) through (30), as illustrated in FIG. 1 of the present invention, it may be formed as a spaced space that is spaced apart at regular intervals and penetrated, but is limited thereto. not.

As illustrated in FIG. 3 , a plurality of communication holes 13b may be provided at the rear end portion of the partition wall 13 so that the partition wall 13 and the inner rear surface of the case contact but the first chamber and the second chamber communicate with each other. of course there is

In addition, the front cap 12 of the case 10 has a pair of coupling holes 12a and 12b to which the intake pipe 21 through which air (air) is introduced and the exhaust pipe 31 through which air is discharged and noise flows are coupled, respectively. ) is formed.

Here, the noise is not emitted from the intake pipe 21 of the silencer according to the present invention, which is the noise discharged from the mechanical device and introduced into the exhaust pipe 31 of the silencer. This is because the structure of the first chamber and the second chamber of the outer case is offset by the structural linkage and disappears.

In the present invention, the shape of the outer case 100 is shown as a hollow rectangular tubular shape with an open front and sealed with a front cap, but the present invention is not limited thereto. Or, of course, a form formed integrally is also possible. In addition, the shape may be not only a rectangular cylindrical shape, but also various other shapes such as a cylindrical shape. Of course, as will be described later, as long as the noise reduction means 200 is provided with a predetermined space, it may have any shape.

The noise reduction means 200 includes an intake part 20 disposed in the first chamber 110 of the outer case 100 and an exhaust part disposed in the second chamber 120 as shown in FIGS. 4 to 7 . (30) may be configured.

The intake part 20 is a product of a predetermined length in which the intake pipe 21, the front end is fitted inside the intake pipe 21, or is connected to the rear end of the intake pipe 21, and a plurality of through holes 22a are formed on the entire side surface. The first sound-absorbing tube 22, the first sound-absorbing case 23 of the hollow in which the first sound-absorbing tube 22 is disposed, and the first sound-absorbing tube 22 are not filled in the inner space of the first sound-absorbing case 23 to surround the first sound-absorbing tube 22 is configured to include a sound absorbing material 25 having a predetermined density.

The exhaust part 30 is an exhaust pipe 31, a second sound absorbing pipe 32 having a front end fitted inside the exhaust pipe 31 or connected to the rear end of the exhaust pipe 31 and having a plurality of through holes 32a formed on the entire side surface. , a second sound-absorbing case 33 in which the second sound-absorbing tube 32 is disposed, a sound-absorbing material having a predetermined density filled in the inner space of the second sound-absorbing case 33 to surround the second sound-absorbing tube 32 (35) is included.

Here, the first sound absorbing pipe 22 and the second sound absorbing pipe 32 may be configured to be integrally formed with the intake pipe 21 and the exhaust pipe 31, respectively, as shown in (C) of FIG. 7 . is of course

In addition, the dimensions of the plurality of through-holes 22a and 32a formed on the entire side of each of the first sound-absorbing tube 22 and the second sound-absorbing tube 32 are the first sound-absorbing tube 22 and the second sound-absorbing tube 32 . ), it is preferable to configure it to have a relatively very small dimension compared to each diameter. This is to allow most of the inflow or outflow air flow to pass through the first sound absorbing pipe 22 and the second sound absorbing pipe 32, but to allow a certain portion of the air to be dispersed to the outside through each through hole.

In addition, by forming a plurality of through-holes on the side surfaces of the first sound-absorbing tube 22 and the second sound-absorbing tube 32, a vortex phenomenon in the air flow flowing through the tube in each through-hole portion of the inner surface of the sound-absorbing tube The vortex creates a countercurrent flow to the outer edge of the main air flow to reduce the noise generated from the incoming or outgoing air flow by offsetting the colliding air waves.

Furthermore, the plurality of through holes formed in the side surfaces of the first sound absorbing tube 22 and the second sound absorbing tube 32 diffract and disperse noise waves and pulsating noises flowing out from the mechanical device in each of the through holes to be described later. In connection with the sound-absorbing case and sound-absorbing material, it is possible to reduce the noise.

In addition, the first sound-absorbing case 23 is a hollow case in which the first sound-absorbing tube 22 is disposed inside, and the air that is diffracted and dispersed from the plurality of through-holes 22a of the first sound-absorbing tube 22 is discharged. It is a space that absorbs and diffuses noise, and similarly, the second sound-absorbing case 33 is a hollow case in which the second sound-absorbing tube 32 is disposed, and a plurality of through-holes 32a of the second sound-absorbing tube 32 are provided. ), it is a space that absorbs and diffusely reflects air or noise that is diffracted, dispersed, and discharged.

The sound-absorbing materials 25 and 35 are a material having a predetermined density having air permeability and open cells, and the first sound-absorbing case 23 and the second sound-absorbing case 23 to surround the first sound-absorbing tube 22 and the second sound-absorbing tube 32 . Each is filled in the inner space of the sound-absorbing case (33).

When air is introduced or a noise wave is incident on the sound absorbing materials 25 and 35, diffuse reflection occurs in the material part, and frictional resistance occurs as a result of friction with the void air in the vent part or the void of the continuous bubble or the wave energy is transmitted to the void air. As this occurs, the noise loses energy and is extinguished, and the pulsating noise caused by the vibration is also extinguished.

At this time, if there is no sound-absorbing case on the outside of the sound-absorbing material, the noise flowing through the sound-absorbing material is transmitted to the outside as it is, so that the noise is still generated, and the pulsating noise is also transmitted to the outside as it is.

Here, the intake part 20 and the exhaust part 30 respectively disposed in the first chamber 110 and the second chamber 120 are spaced apart from the inner surfaces of the first chamber 110 and the second chamber 120 . It is preferable to prevent the transmission of noise wave energy from each sound-absorbing case to the external case, and to allow the noise wave leaked from the space between the sound-absorbing case and the external case to be diffused and interfere with offsetting interference and be extinguished. In addition, the distance between the ends of the intake portion 20 and the exhaust portion 30 and the inner rear surfaces of the first and second chambers is preferably 0.1 to 5 times the length and width of the communication space 13a, and the intake portion ( The end of the 20) and the end of the exhaust unit 30 are preferably disposed adjacent to each other. This is because the flow direction is bent as the air introduced through the intake unit flows out from the intake unit by the suction force from the exhaust unit connected to the mechanical device, and the flow path obstruction due to reflection with the inner rear and inner surfaces of the outer case is minimized. This is to allow it to flow into the exhaust side while doing so. With such a structure, the amount of air introduced through the intake portion is minimized loss and is smoothly introduced into the mechanical device connected through the exhaust portion.

At this time, the first sound-absorbing case 23 and the second sound-absorbing case 33 are integrally formed, or as shown in FIG. 4 , a hollow cylindrical body having an open front end and a rear end, and a front end and a second half Each of the blocking films 23a, 23b, 33a, and 33b having coupling holes may be formed or may be formed of the blocking caps 23c, 23d, 33c, and 33d.

In addition, the intake part and the exhaust part of the noise reduction means insert one end of the first sound absorption tube (or the second sound absorption tube) into the intake pipe (or exhaust pipe) in the order shown in FIG. 2) The other end of the sound-absorbing pipe is inserted into the sound-absorbing material, the sound-absorbing material part is inserted into the first sound-absorbing case (or the second sound-absorbing case), and a blocking film (or blocking cap) is applied at both ends of the first sound-absorbing case (or second sound-absorbing case). can be formed by combining. In this case, it is needless to say that the order of association may be modified.

In addition, as shown in FIG. 8 , the first sound absorption tube 22 of the intake unit 20 and the second sound absorption tube 32 of the exhaust unit 30 may be respectively extended to communicate with each other. Such a structure allows the main through-air of the first sound absorption tube 22 of the intake portion 20 to directly lead to the second sound absorption tube 32 of the exhaust portion 30 to smoothly connect the air flow. This helps the amount of air sucked in through the intake to flow through the exhaust with little loss of outflow. In addition, air waves and noise waves dispersed and diffracted from a plurality of through-holes formed in the connected first and second sound-absorbing tubes cancel each other out by overlapping due to diffuse reflection.

Hereinafter, the operation process of the intake/exhaust silencer 1 for an oxygen generator according to the present invention for reducing the noise generated by the mechanical device will be described as follows.

<In the case that a mechanical device generates suction/exhaust noise while sucking in outside air or discharging internal air>

The end of the exhaust pipe 31 of the intake/exhaust silencer 1 is fixed to an intake hole of a mechanical device that generates noise while sucking/discharging external air.

When power is applied, the mechanical device is driven and the outside air is sucked through the silencer 1 connected to the intake hole.

External air sucked into the silencer 1 is introduced into the silencer through the intake pipe 21 of the intake unit 20 provided in the first chamber 110 and passes through the first sound absorption tube 22 of a predetermined length. However, it is also radially distributed through the plurality of through-holes 22a formed on the entire side surface of the first sound absorbing tube 22 .

At this time, the air flow flowing through the first sound absorption tube 22 is deformed in the pattern of the air flow adjacent to the inner surface by the air flow exiting through the through hole, and a minute vortex phenomenon occurs in each through hole portion of the inner surface. do.

The noise wave caused by the vortex air flow is introduced and overlaps with the noise wave generated from the main air flow passing through the first sound absorbing tube, thereby canceling and reducing the noise to some extent.

In addition, the noise wave of the air dispersed radially through the plurality of through-holes of the first sound-absorbing tube 22 and the air diffracted and dispersed in each through-hole is mutually in the material portion of the sound-absorbing material 25 in the sound-absorbing case. Diffuse reflection occurs, friction with the void air in the vent part or the void of the continuous bubble, or frictional resistance is generated as wave energy is transferred to the void air, and the noise loses energy and disappears to some extent.

As described above, the external air, which passes through the first sound absorption tube 22 of the intake portion 20 of the first chamber 110 and whose noise is primarily reduced, passes through the first sound absorption tube 22 and then passes through the communication space 13a. ) is introduced into the second sound absorption tube 32 of the exhaust unit 30 in the second chamber 120 .

At this time, the air wave noise energy emitted from the air flow that has passed through the first sound absorbing tube spreads radially based on the air flow, and the spread wave energy causes diffuse reflection in the space between the outer case and the sound absorbing case, and cancels and disappears.

Thereafter, the external air with reduced noise primarily introduced into the second sound absorption tube 32 of the exhaust unit 30 passes through the second sound absorption tube 32 of a predetermined length as in the intake portion, but the second sound absorption The airflow that flows through the plurality of through-holes 32a formed on the entire side of the tube 32 is also radially distributed, and the airflow flowing through the second sound-absorbing tube 32 is an airflow adjacent to the inner surface by the airflow exiting through the through-hole. The silver pattern is deformed and a minute eddy current occurs in each through-hole portion of the inner surface.

The noise wave due to the vortex air flow is introduced and overlaps with the noise wave generated from the main air flow passing through the second sound absorbing tube, and the remaining noise is offset and reduced.

In addition, the noise wave of the air dispersed radially through the plurality of through-holes of the second sound-absorbing tube 32 and the air diffracted and dispersed in each through-hole is mutually in the material portion of the sound-absorbing material 35 in the sound-absorbing case. Diffuse reflection occurs, friction with the void air in the vent part or the void of the continuous bubble, or frictional resistance is generated as wave energy is transferred to the void air, and the noise loses energy and disappears to some extent.

As described above, the noise passes through the second sound absorbing pipe 32 of the exhaust part 30 of the second chamber 120 and is reduced secondary, so that the user is silenced from the intake noise or the exhaust noise by reducing the noise twice. will be recognized as

<In the case that the mechanical device sucks in the outside air while generating the intake/exhaust noise and the pulsating noise at the same time>

An end of the exhaust pipe 31 of the intake/exhaust silencer 1 is fixed to an intake hole of a mechanical device that generates noise while sucking in external air, such as an oxygen generator.

When power is applied, the mechanical device draws in external air through the silencer 1 connected to the intake hole while driving, and at the same time discharges the driving noise and pulsating noise according to the driving of the mechanical device.

External air sucked into the silencer 1 is introduced into the silencer through the intake pipe 21 of the intake unit 20 provided in the first chamber 110 and passes through the first sound absorption tube 22 of a predetermined length. However, it is also radially distributed through the plurality of through-holes 22a formed on the entire side surface of the first sound absorbing tube 22 .

At this time, the air flow flowing through the first sound absorption tube 22 is deformed in the pattern of the air flow adjacent to the inner surface by the air flow exiting through the through hole, and a minute vortex phenomenon occurs in each through hole portion of the inner surface. do.

The noise wave caused by the vortex air flow is introduced and overlaps with the noise wave generated from the main air flow passing through the first sound absorbing tube, thereby canceling and reducing the noise to some extent.

In addition, the noise wave of the air dispersed radially through the plurality of through-holes of the first sound-absorbing tube 22 and the air diffracted and dispersed in each through-hole is mutually in the material portion of the sound-absorbing material 25 in the sound-absorbing case. Diffuse reflection occurs, friction with the void air in the vent part or the void of the continuous bubble, or frictional resistance is generated as wave energy is transferred to the void air, and the noise loses energy and disappears to some extent.

As described above, the external air having primarily reduced noise passing through the first sound absorbing pipe 22 of the intake part 20 of the first chamber 110 passes through the communication hole 13a of the second chamber 120 . It is introduced into the second sound absorption tube 32 of the exhaust unit 30 .

At this time, the air wave noise energy emitted from the air flow that has passed through the first sound absorbing tube spreads radially based on the air flow, and the spread wave energy causes diffuse reflection in the space between the outer case and the sound absorbing case, and cancels and disappears.

Thereafter, the external air with reduced noise primarily introduced into the second sound absorption tube 32 of the exhaust unit 30 passes through the second sound absorption tube 32 of a predetermined length as in the intake portion, but the second sound absorption The airflow that flows through the plurality of through-holes 32a formed on the entire side of the tube 32 is also radially distributed, and the airflow flowing through the second sound-absorbing tube 32 is an airflow adjacent to the inner surface by the airflow exiting through the through-hole. The silver pattern is deformed and a minute eddy current occurs in each through-hole portion of the inner surface.

The noise wave due to the vortex air flow is introduced and overlaps with the noise wave generated from the main air flow passing through the second sound absorbing tube, and the remaining noise is offset and reduced.

In addition, the noise wave of the air dispersed radially through the plurality of through-holes of the second sound-absorbing tube 32 and the air diffracted and dispersed in each through-hole is mutually in the material portion of the sound-absorbing material 35 in the sound-absorbing case. Diffuse reflection occurs, friction with the void air in the vent part or the void of the continuous bubble, or frictional resistance is generated as wave energy is transferred to the void air, and the noise loses energy and disappears to some extent.

As described above, since the noise passes through the second sound absorption tube 32 of the exhaust portion 30 of the second chamber 120 and is secondaryly reduced, the user recognizes the suction noise of the intake air as noiseless.

Meanwhile, at the same time, the driving noise and pulsating noise sucked into the silencer 1 are introduced into the silencer through the exhaust pipe 31 of the exhaust unit 30 provided in the second chamber 120, and the second sound absorption of a predetermined length. It penetrates the tube 32 but is also diffracted and dispersed radially through a plurality of through-holes 32a formed on the entire side surface of the second sound-absorbing tube 32 .

At this time, the driving noise and pulsating noise introduced into the second sound absorbing tube 32 transfer energy in the form of a wave and advance along the sound absorbing tube according to overlap and interference by diffracted and dispersed waves for each through hole. Deformation occurs in the noise wave, and waveform distortion occurs at each through-hole portion of the inner surface.

By this waveform distortion, the noise of the advancing noise wave is offset and reduced to some extent.

In addition, the driving noise and the pulsating noise that are radially diffracted and dispersed through the plurality of through-holes of the second sound absorbing tube 32 are diffusely reflected from each other in the material part of the sound absorbing material 35 in the sound absorbing case, and the ventilation part or continuous Friction occurs with the void air in the void of the bubble or when wave energy is transferred to the void air, frictional resistance occurs, and the noise loses energy and disappears to some extent.

As described above, the driving noise and pulsating noise, which pass through the second sound absorption tube 32 of the exhaust part 30 of the second chamber 120 and have primarily reduced noise, pass through the communication hole 13a to the first chamber ( It is introduced into the first sound absorption tube 22 of the intake portion 20 of 110).

At this time, the wave noise energy emitted from the driving noise and the pulsating noise passing through the second sound absorption tube spreads parabolically around the end of the second sound absorption tube, and a part of the spread wave energy is diffusely reflected in the space between the outer case and the sound absorption case. is offset and disappears.

Thereafter, the driving noise and pulsating noise, which have been primarily noise-reduced, introduced into the first sound-absorbing tube 22 of the intake unit 20, passes through the first sound-absorbing tube 22 of a predetermined length as in the exhaust unit. Radially diffracted and dispersed through the plurality of through-holes 22a formed on the entire side surface of the first sound absorbing tube 22 .

And, similarly, the driving noise and the pulsating noise introduced into the first sound absorbing tube 22 move forward while transferring energy in the form of a wave. A distortion occurs in the noise wave, and a waveform distortion occurs at each through-hole portion of the inner surface.

This waveform distortion cancels and reduces the remaining noise of the advancing noise wave.

In addition, the waves of the driving noise and the pulsating noise that pass through a plurality of through-holes of the first sound-absorbing tube 22 and are diffracted and dispersed radially in each of the through-holes are each other in the material portion of the sound-absorbing material 25 in the sound-absorbing case. Diffuse reflection occurs, friction with the void air in the vent part or the void of the continuous bubble, or frictional resistance is generated as wave energy is transferred to the void air, so that the noise loses energy and disappears.

As such, the driving noise and the pulsating noise are secondaryly reduced while passing through the first sound absorption tube 22 of the intake part 20 of the first chamber 110, so that the user perceives the driving noise and the pulsating noise as silent. will be.

Moreover, in this way, in the same sound absorption tube and communication space of the silencer, the noise wave of the incoming air moving forward at the same time in opposite directions, and the wave of the driving noise and the pulsating noise that are discharged are complementary to each other, overlapping and colliding with each other to reduce the noise. By generating a negative effect, the intake noise of air and the driving noise and pulsating noise of machinery are recognized as noiseless.

On the other hand, in order to reduce noise in the connection pipe connecting the mechanical device and the silencer 1 according to the present invention, a noise reduction pipe 4 as shown in FIG. 9 may be further provided in the connection pipe.

The noise reduction pipe 4, the pipe 41, the front end is fitted in the inside of the pipe 41 or connected to the rear end of the pipe 41, a third sound absorption pipe 42 having a plurality of through-holes formed on the entire side surface, A sound-absorbing material having a predetermined density filled in the inner space of the third sound-absorbing case 43 to surround the third sound-absorbing case 43 and the third sound-absorbing tube 42 of the hollow in which the third sound-absorbing tube 42 is disposed ( 45) is included.

Here, of course, the third sound absorbing pipe 42 may be configured to be integrally formed with the pipe 41 .

In addition, it is preferable to configure the dimensions of the plurality of through-holes formed on the entire side of the third sound-absorbing tube 42 to have relatively small dimensions compared to each diameter of the third sound-absorbing tube 42 . This allows most of the inflow or outflow air flow to pass through the third sound absorbing tube 42, and a certain portion of air to be dispersed to the outside through each through hole, and in each through hole portion of the inner surface of the sound absorbing tube This is to reduce the noise generated from the inflow or outflow airflow by causing a vortex phenomenon to occur in the airflow flowing through the pipe.

Moreover, the plurality of through-holes formed on the side surface of the third sound-absorbing tube 42 diffract and disperse the waves of the driving noise and pulsating noise flowing out from the mechanical device in each through-hole, thereby making noise in connection with the sound-absorbing case and sound-absorbing material. to be able to reduce

In addition, the third sound-absorbing case 43 is a hollow case in which the third sound-absorbing tube 42 is disposed therein, diffracted from a plurality of through-holes of the third sound-absorbing tube 42, dispersed and discharged air or noise. It is a space that absorbs and diffusely reflects waves.

The sound-absorbing material 45 is a material having a predetermined density having air permeability and open cells, and is respectively filled in the inner space of the third sound-absorbing case 43 to surround the third sound-absorbing tube 42 .

When air is introduced or noise wave is incident on the sound absorbing material 45, diffuse reflection occurs in the material part, and frictional resistance occurs as the vented part or the void air in the void of the continuous bubble causes friction or the wave energy is transmitted to the void air. As a result, the noise loses energy and is extinguished, and the pulsating noise caused by vibration is also extinguished.

At this time, if there is no sound-absorbing case on the outside of the sound-absorbing material, not only the noise leaking through the sound-absorbing material is generated, but also the pulsating noise is transmitted to the outside as it is.

Although described and illustrated in relation to a preferred embodiment for illustrating the technical idea of the present invention above, the present invention is not limited to the configuration and operation as shown and described as such, and deviates from the scope of the technical idea. It will be apparent to those skilled in the art that many changes and modifications may be made to the present invention without reference to the invention. Accordingly, all such suitable alterations and modifications and equivalents are to be considered as being within the scope of the present invention.

1: silencer
100: outer case 110: first room
120: 2nd room 11: body
12: front cap 13: bulkhead
13a: communication space 13b: communication hole
200: noise reduction means
20: intake part 21: intake pipe
22: first sound-absorbing tube 23: first sound-absorbing case
30: exhaust unit 31: exhaust pipe
32: second sound-absorbing tube 33: second sound-absorbing case
25, 35, 45: sound absorbing material
4: noise reduction piping 41: piping
42: the third sound-absorbing tube 43: the third sound-absorbing case

Claims (3)

an outer case 100 comprising a body 11 and a front cap 12 having a pair of coupling holes 12a and 12b formed therein; and
It is provided in the outer case 100, the noise reduction means 200 having an intake part 20 and an exhaust part 30;
The outer case 100 is composed of a first chamber 110 and a second chamber 120 communicating at the rear end, and the first chamber 110 and the second chamber 120 are in the longitudinal direction of the outer case. An intake and exhaust silencer for an oxygen generator, characterized in that it is formed by a partition wall (13) formed with
The method of claim 1,
Between the rear end of the partition wall 13 and the inner rear surface of the case 100, a communication space 13a formed to be spaced apart from each other is provided, or
The rear end of the partition wall 13 and the inner rear surface of the outer case 100 are in contact with each other, but at the rear end of the partition wall 13 so that the first chamber 110 and the second chamber 120 communicate with each other. An intake and exhaust silencer for an oxygen generator, characterized in that it is provided with a plurality of communication holes (13b).
The method of claim 1,
The noise reduction means 200 includes an intake part 20 disposed in the first chamber 110 provided in the outer case 100 and an exhaust part 30 disposed in the second chamber 120 , ,
The intake part 20,
intake pipe 21; a first sound absorbing pipe 22 having a predetermined length in which the front end is fitted into the intake pipe 21 or is connected to the rear end of the intake pipe 21 and has a plurality of through holes 22a formed on the side thereof; a first hollow sound-absorbing case 23 in which the first sound-absorbing tube 22 is disposed; and a sound-absorbing material 25 having a predetermined density filled in the inner space of the first sound-absorbing case 23 so as to surround the first sound-absorbing tube 22;
The exhaust unit 30,
exhaust pipe 31; a second sound absorbing pipe 32 having a front end fitted inside the exhaust pipe 31 or connected to the rear end of the exhaust pipe 31 and having a plurality of through holes 32a on the side thereof; a second hollow sound-absorbing case 33 in which the second sound-absorbing tube 32 is disposed; and a sound-absorbing material (35) having a predetermined density filled in the inner space of the second sound-absorbing case (33) so as to surround the second sound-absorbing pipe (32). .

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