WO2021177661A1

WO2021177661A1 - Flow guide for noise reduction and device for reducing noise

Info

Publication number: WO2021177661A1
Application number: PCT/KR2021/002396
Authority: WO
Inventors: 김정환; 박준철; 이효경
Original assignee: 주식회사 힘펠
Priority date: 2020-03-03
Filing date: 2021-02-25
Publication date: 2021-09-10
Also published as: KR102379679B1; KR102379679B9; KR20210111562A

Abstract

A purpose of the present invention is to provide a flow guide for noise reduction and a device for reducing noise, wherein noise can be reduced effectively without disturbing the air flow, thereby saving the volume and cost. A flow guide for noise reduction of the present invention is a flow guide installed inside a flow channel formed to allow air to flow from one side to the other side thereof, and comprises: a center part extending from one side to the other side thereof; and a guide part protruding from the outer circumference of the center part in the direction of diameter. The guide part extends along the longitudinal direction of the center part, and the other end of the guide part is formed at a position where same is rotated from one end of the guide part by a set angle. A device for reducing noise of the present invention comprises: the above-described flow guide; an upper case assembled on one end of the flow guide; and a lower case assembled on the other end of the flow guide, and a flow channel is formed by the upper case and the lower case.

Description

Flow guide and noise reduction device for noise reduction

The present invention relates to a noise reducer including a flow guide and a flow guide installed between ducts for ventilation. More particularly, it relates to a noise reduction flow guide and noise reduction device for effectively reducing noise transmitted along a duct without disturbing air flow.

In the bathroom of the apartment house, a noise reducer is installed to prevent the sound of a toilet bowl from flowing to other floors along the exhaust line of the fan and causing noise between floors. It is formed so that it can be installed between the conventional fan ducts.

1 is a perspective view of a conventional noise reducer, and FIG. 2 is an exploded perspective view of FIG. When described in more detail with reference to these drawings, the conventional noise reducer (1) includes an upper case (2) and a lower case (3) connected to a duct to form a flow path therein, and a sound absorbing material (5) in the case and a flow guide (4). In addition to being fixed to the duct, the noise reducer 1 is formed to be fixed to an external structure by an installation bracket 6 to increase structural stability.

The upper case (2) and the lower case (3) have a pipe connection part (9) through which the intake/exhaust port (8) is formed and connected to the ventilator duct, respectively, and the diameter of the pipe connection part (9) is the upper case (2) and the lower case 3 is formed to be smaller than the diameter of the central part, and the cross-sectional area of the flow path is changed as it passes through the noise reducer 1 . Therefore, when the sound passes through a space with a different cross-sectional area, the sound waves collide and cancel each other at the same time to have a structure in which the noise can be reduced.

Meanwhile, in the conventional flow guide 4 , a radial grid 7 is formed inside a tapered body, and the radial grid 7 is formed to extend along the longitudinal direction of the flow guide 4 . This structure has the effect of reducing the noise by introducing sound waves without disturbing the flow and splitting the wavelength, but restricts the radial flow of the upper case 2 and the lower case 3 to convert the entire cross-sectional area of the case into the flow path. Since it cannot be utilized, the noise reduction effect is low, and as a result, there is a problem in that the overall volume of the noise reducer 1 is increased.

In addition, the conventional noise reducer 1 is configured to fit the sound absorbing material 5 to the outer periphery of the flow guide 4 by forming the sound absorbing material 5 in the same tapered shape as the outer circumferential surface of the flow guide 4 in order to fix the sound absorbing material 5 . This structure also becomes a factor limiting the change in the flow passage cross-sectional area, and furthermore, there is a problem in that the noise reduction performance is impaired by reducing the contact surface between the noise and the sound absorbing material 5 .

An object of the present invention is to solve the problems of the prior art as described above, and specifically, to provide a flow guide and a noise reducer having excellent noise reduction effect without disturbing air flow. Furthermore, an object of the present invention is to provide a flow guide and a noise reducer for reducing the volume and cost by improving the noise reduction effect.

An embodiment of the present invention provides a flow guide and a noise reducer for noise reduction as follows in order to solve the above problems.

A flow guide for noise reduction of the present invention is a flow guide installed in a flow path formed so that air flows from one side to the other, and includes a center part extending from one side to the other side; and a guide part protruding from the outer periphery of the center part in a radial direction. Including, wherein the guide part is formed extending along the longitudinal direction of the center part, the other end of the guide part is characterized in that it is formed at a position rotated by an angle set from one end of the guide part.

In addition, a plurality of guide parts are formed, and one end of one guide part and one end of the other guide part adjacent to the other end are formed at a position rotated by the same angle with respect to one end of the guide part.

In addition, the length of the guide portion is formed to be longer than the length of the center portion, and one end and the other end of the guide portion are formed to be connected to one end and the other end of the center portion, characterized in that the central portion is formed concave.

In addition, the guide part is formed to extend in the longitudinal direction of the center part, one end and the other end are extended in a plane, it characterized in that the connection between the one end and the other end in a curved surface.

Further, the present invention noise reducer, including the above-described flow guide, the upper case assembled from one end of the flow guide; and a lower case assembled from the other end of the flow guide. Including, characterized in that the flow path is formed by the upper case and the lower case.

In addition, first fitting grooves recessed in the longitudinal direction are formed at one end and the other end of the guide part, and the upper case and the lower case are formed with a tubular pipe connection part through which intake and exhaust ports are formed in the longitudinal direction, inside A flow guide fixing rib protrudes and extends along the circumference of the intake and exhaust port, and a second fitting groove engaged with the first fitting groove in the longitudinal direction is recessed in the flow guide fixing rib.

In addition, a sound absorbing material disposed between the upper case and the lower case and the flow guide; It further includes, wherein the sound-absorbing material is in contact with the upper case and the lower case, characterized in that it is arranged to be spaced apart from the flow guide.

In addition, any one or more of the upper case and the lower case, it is characterized in that it comprises a sound-absorbing material fixing ribs formed to protrude in the longitudinal direction spaced apart a predetermined distance from the inner wall at the inner end.

According to the problem solving means of the present invention as described above, various effects including the following items can be expected. However, the present invention is not established only when exhibiting all of the following effects.

According to the flow guide for noise reduction of the present invention, by guiding the air flow in the radial and longitudinal directions at the same time, there is an effect that can reduce the noise by emitting noise without inhibiting the air flow.

In addition, both ends of the flow guide are concavely formed to prevent noise from colliding with the flow guide as air flows in, and it is possible to guide the flow of air between the guide parts.

Furthermore, according to the noise reducer of the present invention, the flow guide is assembled at the center of the upper and lower cases, and since the flow guide does not interfere with the flow inside the case, the entire cross-sectional area of the case can be used as a flow path. Therefore, the cross-sectional area difference with the fan duct is large, which has the advantage of excellent noise reduction effect.

Similarly, since the sound absorbing material is disposed so as to be in contact with the inner wall of the case and does not interfere with the flow inside the case, the noise reduction effect may be improved.

In addition, since the noise reduction effect is improved according to the structure of the flow guide and the noise reducer of the present invention, the overall length of the noise reducer can be reduced, thereby reducing the total volume.

The present applicant tested the noise reduction effect of the prior art and the present invention, and as a result of the test, although the size of the present invention was reduced by about 34%, the noise was further reduced by 0.4 dB compared to the prior art when the sound absorbing material is not applied, and the sound absorbing material is applied in the prior art It was found that the noise was reduced by 2dB more compared to the

		종래기술prior art	본 발명the present invention
사이즈 (직경(Φ) * 길이(H) )Size (Diameter(Φ) * Length(H) )		100 * 380100 * 380	100 * 250100 * 250
기준 소음 (dB)Reference noise (dB)		5050
측정 소음measurement noise	흡음재 미적용No sound absorbing material	45.645.6	45.245.2
	흡음재 적용Sound-absorbing material applied	44.544.5	42.742.7

1 is a perspective view of a conventional noise reducer;

Figure 2 is an exploded perspective view of Figure 1;

3 is a perspective view of a noise reducer of the present invention;

Figure 4 is an exploded perspective view of Figure 3;

Figure 5 is a front view showing only the flow guide for noise reduction of the present invention in Figure 4,

Fig. 6 is a plan view of Fig. 5;

7 is a longitudinal cross-sectional view taken along line VII-VII' in FIG. 4;

8 is a plan view showing only the lower case in FIG. 4;

9 is a perspective view of FIG. 8 ;

Hereinafter, a specific embodiment of the noise reducer including a flow guide for noise reduction will be described in detail with reference to the drawings.

Figure 3 is a perspective view of the present invention noise reducer, Figure 4 is an exploded perspective view of Figure 3, Figure 5 is a front view showing only the flow guide for noise reduction of the present invention in Figure 4, Figure 6 is a plan view of Figure 5, Figure 7 is In Fig. 4, a longitudinal cross-sectional view taken along line VII-VII', Fig. 8 is a plan view showing only the lower case in Fig. 4, and Fig. 9 is a perspective view of Fig. 8 .

As shown in these drawings, the noise reducer 10 of the present invention includes an upper case 20 and a lower case 30 connected to the fan duct, and is formed by the upper case 20 and the lower case 30. The formed internal space is used as a flow path, and a flow guide 40 and a sound absorbing material 50 are installed on the flow path to guide air flow.

The noise reducer 10 has intake and

exhaust ports

22 and 32 formed in the upper case 20 and the lower case 30 so that air can flow from one side to the other side, and it is also possible to flow from the other side to the one side, and the noise level the same Accordingly, the upper and lower portions of the silencer including the upper case 20 and the lower case 30 may be symmetrically formed. In particular, the upper case 20 and the lower case 30 may be formed to be injected with the same mold.

To this end, a case assembly groove 38 and a case assembly protrusion 39 may be formed at the assembly end of each case. The case assembly groove 38 and the case assembly projection 39 are both formed in each case, and the shape of the case assembly groove 38 of the upper case is when the upper case 20 is rotated 180 degrees with respect to the lower case 30. and the case assembly protrusion 39 of the lower case is disposed to engage. That is, the case assembly groove 38 is formed at a position rotated 180° from the case assembly projection 39 along the assembly end, and one case assembly groove 38 and the case assembly projection 39 may be formed as shown in the figure. Also, a plurality of case assembly grooves 38 and case assembly protrusions 39 may be formed.

The upper case 20 and the lower case 30 include

bodies

24 and 34, and

pipe connection portions

23 and 33 formed at the ends of the

bodies

24 and 34 and through which intake and

exhaust ports

22 and 32 are formed. is formed by The

bodies

24 and 34 are formed to extend beyond the

pipe connection parts

23 and 33 , and the

bodies

24 and 34 of the upper case 20 and the lower case 30 are coupled to each other to be assembled with each other. Since the upper case 20 and the lower case 30 have fastening

holes

21 and 31 formed around them, they can be assembled by applying bolts to the fastening holes of both parts and coupling them together.

In addition, as shown in FIGS. 8 and 9 , the flow guide fixing ribs 36 may be extended inward along the intake and

exhaust ports

22 and 32 in the upper case 20 and the lower case. This is a configuration for fixing the flow guide 40, and the first fitting groove 37 may be recessed along the circumferential direction at the end of the flow guide fixing rib 36, and as shown in the drawing, the first fitting groove 37 ) It is also possible to form the first fitting groove (37) by forming the adjacent portion more protruding.

In addition, the upper case 20 and the lower case 30, the end of the intake and exhaust port (22, 32) side of the body (24, 34), the sound absorbing material fixing rib 35 may be formed to protrude in the longitudinal direction. The sound absorbing material fixing rib 35 is advantageous in fixing the sound absorbing material 50 when the upper case 20 and the lower case 30 have a polygonal cross section and is formed at a portion where the vertex is located. In addition, the sound-absorbing material fixing ribs 35 are formed to be spaced apart from the inner wall by a predetermined distance, and it is preferable that the spaced distance corresponds to the thickness of the sound-absorbing material 50 . This is to install the sound absorbing material 50 to be in contact with the inner wall surface, so that the entire inner space of the case is utilized without disturbing the air flow radiated from the flow guide 40, and the noise and the sound absorbing material 50 are in contact. The usable area can be maximized, and the noise reduction effect can be improved.

The sound absorbing material 50 may use a porous sound absorbing material 50 , a plate-shaped sound absorbing material 50 , and the like, and may be formed to correspond to the inner shape of the upper case 20 and the lower case 30 . In addition, as described above, the upper case 20 and the lower case 30 are inserted to be in contact with the inner wall, and the position may be fixed by the sound-absorbing material fixing rib 35 .

The flow guide 40 serves to radiate air and noise toward the inner walls of the upper case 20 and the lower case 30 without impeding the air flow in the noise reducer 10 . The flow guide 40 is illustrated in detail in FIGS. 4 to 7 .

Referring to these drawings, the flow guide 40 may be divided in a direction perpendicular to the axial direction as shown in FIG. 4 . This is to form the flow guide 40 in a shape that can be injected in the axial direction, and the upper guide 40a and the lower guide 40c are injection-manufactured in the same shape and assembled using the assembly structure formed in the central part. One flow guide 40 may be formed. Furthermore, as shown in the drawings, it may further include a ring-shaped connector 40b interposed between the upper guide 40a and the lower guide 40c to connect the two parts.

When the flow guide 40 is viewed as one part, the flow guide 40 protrudes from the outer surface of the hollow center portion 41 extending in one direction and the center portion 41 as shown in FIGS. 5 to 7 . and a guide portion 42 extending along the center portion 41 . The flow guide 40 is formed like a long blade as a whole, and the guide portion 42 of the present invention is formed in a twisted shape along the longitudinal direction, unlike the conventional technology that is simply extended in a straight line. That is, the guide part 42 is formed extending from one end to the other end, and the other end of the guide part 42 is formed at a position rotated by a predetermined angle with respect to the center of the center part 41 .

Further, as shown in FIG. 5, one end and the other end (A) of the guide part 42 are formed to extend straight in a planar shape, and the other end is formed at a position rotated by a predetermined angle from one end, so that one end and Between the other ends (B) may be formed in a curved surface. This is to facilitate fluid inflow and outflow.

In addition, the position of the other end of one guide part 42 and the one end of the guide part 42 adjacent thereto may be formed to match. In this case, as shown in FIG. 6 , when looking at the other end direction from one end of the flow guide 40 , it may be formed as if the gap between the guide parts 42 is blocked, so that as many sound waves as possible are generated from the upper case 20 and the lower case 30 . It may be guided to radiate toward the inner wall. Accordingly, air can flow between the inside of the center part 41 and the guide part 42 so that the flow is not disturbed, and at the same time, noise can be radiated along the guide part 42 . That is, there is an effect of blocking the noise propagation gap while minimizing the resistance of the flow with the minimum amount of torsion in consideration of the flow characteristics.

In addition, the center portion 41 may be formed to have a shorter total length than the guide portion 42 , and may be formed such that the center portion 41 is placed in the center of the guide portion 42 in the longitudinal direction. Further, the central portions of both ends of the guide portion 42 may be formed to have the same length as the center portion 41 , and the ends of the guide portion 42 may be concave from the outside to the inside (C). This reduces the collision between the flow guide 40 and the air when the air flow is dispersed in the radial direction as the passage area of the air introduced into the noise reducer 10 through the

pipe connection parts

23 and 33 is rapidly expanded. This is to prevent additional noise from being generated. In addition, this structure has the effect of reducing fluid loss as well. At this time, it is preferable that the concave portion (C) is formed as a curved surface as shown in the drawing so that noise reduction and flow effect can be maximized.

In addition, a second fitting groove 47 having a shape corresponding to the first fitting groove 37 may be recessed in one end and the other end of the guide part 42 . By assembling the first fitting groove 37 and the second fitting groove 47 together, the upper case 20 and the lower case 30 can be assembled at both ends of the flow guide 40 .

Although specific embodiments have been described in detail for each configuration in the present specification, embodiments that can be derived by arbitrarily combining some configurations also fall within the scope of the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains can make various modifications and variations without departing from the essential characteristics of the present invention. The scope of protection should be interpreted by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

1 Noise Reduction 2 Upper Case

3 Lower case 4 Floating guide

5 Sound absorbing material 6 Mounting bracket

7 Radial grid 8 Intake and exhaust vents

9 pipe connection

10 Noise Reduction

20

Upper case

21, 31, 61 fastening hole

22, 32 Intake and

exhaust port

23, 33 Pipe connection

24, 34 body

30 Lower case 35 Sound absorbing material fixing rib

36 Floating guide fixing rib 37 First fitting groove

38 Case assembly groove 39 Case assembly projection

40 Floating guide 41 Center part

42 Guide part 47 Second fitting groove

50 sound absorbing material

Claims

As a flow guide installed in a flow path formed so that air flows from one side to the other side,

a center portion extending from one side to the other side; and

a guide part protruding from the outer periphery of the center part in a radial direction;

includes,

The guide portion is formed extending along the longitudinal direction of the center portion, the other end of the guide portion is a noise reduction flow guide, characterized in that formed at a position rotated by a set angle from one end of the guide portion.
According to claim 1,

The guide part is formed in plurality,

A flow guide for noise reduction, characterized in that with respect to one end of one guide part, the other end of one guide part and one end of the other guide part adjacent to each other are formed at a position rotated by the same angle.
According to claim 1,

The length of the guide part is formed longer than the length of the center part,

One end and the other end of the guide part are formed to be connected to one end and the other end of the center part, and the flow guide for noise reduction, characterized in that the central part is concave.
According to claim 1,

The guide part is formed extending along the longitudinal direction of the center part, one end and the other end extending in a plane, the noise reduction flow guide, characterized in that the connection between the one end and the other end in a curved surface.
As a noise reducer comprising the flow guide of any one of claims 1 to 4,

an upper case assembled from one end of the flow guide; and

a lower case assembled from the other end of the flow guide;

includes,

A noise reducer, characterized in that a flow path is formed by the upper case and the lower case.
6. The method of claim 5,

A first fitting groove which is recessed in the longitudinal direction is formed at one end and the other end of the guide part,

The upper case and the lower case, a tubular connection portion through which the intake and exhaust ports are formed in the longitudinal direction is formed, and the flow guide fixing ribs protrude along the periphery of the intake and exhaust ports on the inside and are formed to extend,

A second fitting groove engaged with the first fitting groove in the longitudinal direction is recessed in the flow guide fixing rib.
6. The method of claim 5,

a sound absorbing material disposed between the upper case and the lower case and the flow guide;

further comprising,

The sound absorbing material is in contact with the upper case and the lower case, the noise reducer, characterized in that it is arranged to be spaced apart from the flow guide.
8. The method of claim 7,

At least one of the upper case and the lower case includes a sound-absorbing material fixing rib formed to protrude in the longitudinal direction at an inner end spaced apart from the inner wall by a predetermined distance.