WO2022162731A1

WO2022162731A1 - Muffling device

Info

Publication number: WO2022162731A1
Application number: PCT/JP2021/002649
Authority: WO
Inventors: 樹司村上; 一輝岡本; 裕司水野; 真也加藤
Original assignee: 三菱電機株式会社
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2022-08-04
Also published as: EP4286762A4; JP7558305B2; EP4286762A1; JPWO2022162731A1

Abstract

A muffling device (2) connected to a duct blower that supplies and discharges air comprises: a rectangular parallelepiped box-shaped housing (8); and an air path component (6) that is installed in the housing (8) and forms, in the housing (8), a supply air suction side chamber (5b) connected to a suction air path on the air supply side of the duct blower, a supply air discharge side chamber (5a) connected to a discharge air path on the air supply side of the duct blower, an exhaust air suction side chamber (5d) connected to a suction air path on the exhaust side of the duct blower, and an exhaust air discharge side chamber (5c) connected to a discharge air path on the exhaust side of the duct blower. The volume of the portion of the air path component (6) that forms the supply air discharge side chamber (5a) is larger than the volume of the portion of the air path component (6) that forms the supply air suction side chamber (5b). The volume of the portion of the air path component (6) that forms the exhaust air discharge side chamber (5c) is larger than the volume of the portion of the air path component (6) that forms the exhaust air suction side chamber (5d).

Description

silencer

The present disclosure relates to a silencer that suppresses duct noise.

Duct blowers that supply and exhaust air through ducts are widely used for ventilation purposes. When the discharge side of the duct blower is indoors, the draft noise flowing through the duct may be uncomfortable, and noise reduction is required. Also, even if the discharge side is outdoors, it is necessary to avoid noise to nearby houses due to the density of houses in urban areas, and noise reduction is required in the same way as when the discharge side is indoors. For this purpose, a silencer having a sound absorbing material is used together with a duct blower. The muffler is either connected in the middle of the duct or attached directly to the duct blower.

In a heat exchange ventilator that simultaneously supplies and exhausts air, it is necessary to muffle both the supply air duct and the exhaust duct. Installing separate silencers for the air supply duct and the exhaust duct increases the man-hours required for installation work. Therefore, in order to reduce the man-hours, a composite silencer capable of silencing a plurality of ducts is sometimes used. Patent Literature 1 discloses a composite muffler that muffles the suction side and the discharge side of each of supply air and exhaust air. A composite muffler is more expensive than a single-tube muffler that muffles only one duct, but is easier to install than a single-tube muffler installed in each of a plurality of ducts. is.

EP 2642215

A composite silencer is larger in size than a single-tube silencer because it integrates multiple air passages and silencers that silence each air passage. For this reason, there is a problem that it is difficult to secure an installation space for a composite muffler capable of preventing noise from being transmitted indoors or outdoors.

The present disclosure has been made in view of the above, and aims to obtain a noise suppressor that is a composite type, can suppress an increase in device size, and can prevent noise from being transmitted indoors or outdoors.

In order to solve the above-described problems and achieve the object, the muffler according to the present disclosure is a muffler connected to a ventilation device that supplies and exhausts air, and includes a rectangular box-shaped housing and a housing installed in the housing. A supply air suction side chamber connected to the air supply side suction air passage of the ventilation device, a supply air discharge side chamber connected to the air supply side discharge air passage of the ventilation device, and an air supply side discharge side chamber connected to the ventilation device and an air passage component forming an exhaust suction side chamber connected to the suction air passage of the ventilator and an exhaust discharge side chamber connected to the exhaust side discharge air passage of the ventilator. The volume of the portion of the air passage forming member that forms the supply air discharge side chamber is larger than the volume of the portion of the air passage forming member that forms the air supply suction side chamber. The volume of the portion of the air passage forming member that forms the exhaust discharge side chamber is larger than the volume of the portion of the air passage forming member that forms the exhaust suction side chamber.

The blower apparatus according to the present disclosure is a composite type, and has the effect of being able to suppress an increase in the size of the apparatus and to prevent noise from being transmitted indoors or outdoors.

1 is a perspective view of a silencer according to Embodiment 1 1 is a perspective view of a duct blower to which a noise suppressor according to Embodiment 1 is attached; FIG. FIG. 3 is a diagram showing an assembled state of the noise suppressing device and the duct blower according to the first embodiment; Sectional view of the silencer according to Embodiment 1 Sectional view of the silencer according to Embodiment 1 Cross-sectional view of a silencer according to Embodiment 2 Cross-sectional view of a silencer according to Embodiment 3

Below, the silencer according to the embodiment will be described in detail based on the drawings.

Embodiment 1.
FIG. 1 is a perspective view of a silencer according to Embodiment 1. FIG. The muffler 2 includes a rectangular parallelepiped box-shaped housing 8 . A discharge port 3a and a suction port 3b are provided on a first surface 8a of the housing 8 and a second surface 8b facing the first surface 8a. The first surface 8a and the second surface 8b may be the upper surface and the lower surface of the housing 8, or may be two opposite side surfaces of the housing 8. As shown in FIG.

FIG. 2 is a perspective view of a duct blower to which the silencer according to Embodiment 1 is attached. The white arrows in FIG. 2 represent the flow of air. The duct blower 1 has a supply air inlet 1a, a supply air outlet 1b, an exhaust air inlet 1c, and an exhaust air outlet 1d provided on one surface. The air sucked from the air supply suction port 1a is discharged from the air supply discharge port 1b. The air sucked from the exhaust suction port 1c is discharged from the exhaust discharge port 1d.

FIG. 3 is a diagram showing how the silencer according to Embodiment 1 and the duct blower are assembled. A muffler 2 according to Embodiment 1 is directly connected to a duct blower 1, which is a ventilation device for air supply and exhaust. When the noise suppressing device 2 is connected to the duct fan 1 , the first surface 8 a contacts the housing of the duct fan 1 . A supply air intake duct, a supply air discharge duct, an exhaust air intake duct, and an exhaust air discharge duct (not shown) are connected to the discharge port 3a and the suction port 3b formed on the second surface 8b. The supply air intake duct is a duct for taking in outside air from the outdoors, and forms an intake air passage on the supply side. The air supply/discharge duct is a duct for supplying air into the room, and constitutes a discharge air passage on the supply side. The exhaust intake duct is a duct for taking in room air, and forms an intake air passage on the exhaust side. The exhaust discharge duct is a duct for discharging air to the outside, and constitutes a discharge air passage on the exhaust side. The silencer 2 attenuates the noise generated in the duct blower 1 and suppresses the transmission of the noise indoors or outdoors through the supply air intake duct, the supply air discharge duct, the exhaust air intake duct, and the exhaust air discharge duct.

4 and 5 are cross-sectional views of the silencer according to Embodiment 1. FIG. FIG. 4 shows a cross section of the silencer 2 along line IV-IV in FIG. FIG. 5 shows a cross section of the silencer 2 along line VV in FIG. Although FIG. 5 shows a cross section passing through the air supply discharge side chamber 5a and the air supply suction side chamber 5b, a cross section passing through the exhaust discharge side chamber 5c and the exhaust suction side chamber 5d has the same cross section structure. there is In the silencer 2, the inside of the housing 8 is partitioned into four

chambers

9a, 9b, 9c, and 9d by the partition plate 4. As shown in FIG. Due to the air passage components 6 arranged in each of the

rooms

9a, 9b, 9c, and 9d, the housing 8 has a supply air discharge side chamber 5a, a supply air suction side chamber 5b, an exhaust discharge side chamber 5c, and an exhaust suction side chamber 5c. 5d is formed. The supply air suction side chamber 5b and the exhaust air suction side chamber 5d are provided with a discharge port 3a on the first surface 8a and a suction port 3b on the second surface 8b. The air supply discharge side chamber 5a and the exhaust discharge side chamber 5c are provided with the suction port 3b on the first surface 8a and the discharge port 3a on the second surface 8b. The volume of the room 9a in which the supply air discharge side chamber 5a is formed is larger than the volume of the room 9b in which the supply air suction side chamber 5b is formed. Further, the volume of the room 9c in which the exhaust discharge side chamber 5c is formed is larger than the volume of the room 9d in which the exhaust suction side chamber 5d is formed.

Also, the suction port 3b and the discharge port 3a of the air supply discharge side chamber 5a and the exhaust discharge side chamber 5c have different positions in a plane parallel to the first surface 8a and the second surface 8b. On the other hand, the suction port 3b and the discharge port 3a of the supply air suction side chamber 5b and the exhaust suction side chamber 5d have the same position in a plane parallel to the first plane 8a and the second plane 8b.

A supply air intake duct leading to the outdoors is connected to the intake port 3b of the supply air intake side chamber 5b. An exhaust discharge duct leading to the outside is connected to the discharge port 3a of the exhaust discharge side chamber 5c. An air supply discharge duct leading to the interior of the room is connected to the discharge port 3a of the air supply discharge side chamber 5a. An exhaust air intake duct leading to the inside of the room is connected to the intake port 3b of the exhaust air intake side chamber 5d. Thus, the muffler 2 is a composite muffler that muffles a plurality of ducts. The discharge port 3a and the suction port 3b of each of the supply air discharge side chamber 5a, the supply air suction side chamber 5b, the exhaust discharge side chamber 5c and the exhaust suction side chamber 5d have the same air passage area.

The air passage component 6 includes a first sound deadening material 6a forming the supply air discharge side chamber 5a and the exhaust discharge side chamber 5c, and a second sound deadening material forming the supply air intake side chamber 5b and the exhaust air intake side chamber 5d. 6b. The first sound-absorbing material 6a is a porous sound-absorbing material, and the second sound-absorbing material 6b is plastic foam. The second sound absorbing material 6b may be a porous sound absorbing material.

Since the volume of the room 9a in which the air supply discharge side chamber 5a is formed is larger than the volume of the room 9b in which the air supply intake side chamber 5b is formed, the air supply discharge side chamber 5a is formed in the air passage component 6. The volume of the portion forming the supply air suction side chamber 5b of the air passage component 6 is larger than the volume of the portion. In addition, since the outlet 3a and inlet 3b of each of the supply air discharge side chamber 5a, the supply air suction side chamber 5b, the exhaust discharge side chamber 5c and the exhaust suction side chamber 5d have the same air passage area, (Va/S)>(Vb/S), where Va is the volume of the chamber 9b, Vb is the volume of the room 9b, and S is the air passage area of the discharge port 3a and the suction port 3b. Therefore, the silencing performance of the supplied air discharge side chamber 5a is higher than the silencing performance of the supplied air suction side chamber 5b.

Similarly, the volume of the room 9c in which the exhaust discharge side chamber 5c is formed is larger than the volume of the room 9d in which the exhaust suction side chamber 5d is formed. The volume of the portion forming the exhaust suction side chamber 5d of the air passage component 6 is larger than the volume of the portion forming the exhaust suction side chamber 5d. In addition, since the outlet 3a and inlet 3b of the supply air discharge side chamber 5a, the supply air suction side chamber 5b, the exhaust discharge side chamber 5c, and the exhaust suction side chamber 5d have the same air passage area, (Vc/S)>(Vd/S), where Vc is the volume of the room 9d, Vd is the volume of the room 9d, and S is the air passage area of the discharge port 3a and the suction port 3b. Therefore, the noise reduction performance in the exhaust discharge side chamber 5c is higher than the noise reduction performance in the exhaust suction side chamber 5d.

In addition, the volume of the portion of the air passage forming member 6 forming the air supply discharge side chamber 5a is the same as the volume of the air passage forming member 6 forming the air supply suction side chamber 5b, The volume of at least one of the portion forming the side chamber 5c and the portion of the air passage forming member 6 forming the exhaust suction side chamber 5d is larger than the volume thereof. That is, the volume of the portion of the air passage forming member 6 that forms the air supply discharge side chamber 5a is not the smallest compared to the volume of the portion of the air passage forming member 6 that forms the other chambers. If the volume of the portion forming the air supply discharge side chamber 5a in the air passage constituting member 6 is the smallest compared to the volume of the portions forming the other chambers, the noise generated by the duct blower 1 will cause the air to be supplied. Although the noise tends to be transmitted into the room through the discharge side chamber 5a, such a phenomenon is suppressed in the noise suppressor 2 according to the first embodiment.

Further, since the suction port 3b and the discharge port 3a of the air supply discharge side chamber 5a and the exhaust discharge side chamber 5c are located at different positions in a plane parallel to the first surface 8a and the second surface 8b, The noise generated by the duct blower 1 is less likely to pass through the supply air discharge side chamber 5a or the exhaust air discharge side chamber 5c. That is, the noise generated by the duct blower 1 is likely to be attenuated in the supply air discharge side chamber 5a or the exhaust air discharge side chamber 5c.

The air supply discharge side chamber 5a and the exhaust discharge side chamber 5c have straight air paths between the suction port 3b and the discharge port 3a. Since the air passage between the suction port 3b and the discharge port 3a of the air supply discharge side chamber 5a or the exhaust discharge side chamber 5c is straight, it is arranged in the

chambers

9a and 9c separated by the partition plate 4. By increasing the amount of the first sound deadening material 6a, it is possible to improve the sound deadening performance, suppress rapid expansion and rapid contraction of the air passage area, and reduce the pressure loss in the air passage in the chamber.

In addition, in the supply air suction side chamber 5b and the exhaust air suction side chamber 5d, the cross-sectional area of the air passage between the suction port 3b and the discharge port 3a is constant. The supply air suction side chamber 5b and the exhaust air suction side chamber 5d are located in the

chambers

9b and 9d separated by the partition plate 4 because the cross-sectional area of the air passage between the suction port 3b and the discharge port 3a is constant. It is possible to increase the amount of the second sound deadening material 6b arranged in the chamber, improve the sound deadening performance, suppress the rapid expansion and rapid contraction of the air passage area, and reduce the pressure loss in the air passage in the chamber. can.

It is sufficient that the air passage component 6 is arranged at least in the room 9a in which the air supply discharge side chamber 5a is formed and the room 9c in which the exhaust discharge side chamber 5c is formed.

The noise reduction device 2 according to Embodiment 1 includes an air supply discharge side chamber 5a located downstream of the duct blower 1, which is a noise source, in the air passage forming member 6 in the direction of the air flow generated by the duct blower 1. is larger than the volume of the portion forming the supply air intake side chamber 5b upstream of the duct blower 1 in the air passage constituting member 6, so that the noise traveling direction is the direction of the airflow The silencing property of the air supply discharge side chamber 5a which is in the same direction as that can be improved. Similarly, on the exhaust side, in the direction of the airflow generated by the duct blower 1, the portion forming the exhaust discharge side chamber 5c, which is downstream of the duct blower 1, which is the noise source, of the air passage forming member 6. Since the volume is larger than the volume of the portion forming the exhaust suction side chamber 5d upstream of the duct blower 1 in the air passage component 6, the direction of noise travels in the same direction as the direction of the airflow. The silencing property of the ejection side chamber 5c can be enhanced.

When the air passage components 6 of all the

rooms

9a, 9b, 9c, and 9d are of the same size, noise is prevented from being transmitted indoors or outdoors from the air supply discharge side chamber 5a and the exhaust discharge side chamber 5c. , the supply air intake side chamber 5b and the exhaust air intake side chamber 5d have excessive noise reduction performance, and the size of the housing 8 is increased more than necessary. On the other hand, if the supply air discharge side chamber 5a and the exhaust discharge side chamber 5c are provided with the same silencing performance as that for preventing noise from being transmitted from the supply air suction side chamber 5b and the exhaust suction side chamber 5d to the inside or outside, Noise is transmitted indoors or outdoors due to lack of silencing performance. In the muffler 2 according to Embodiment 1, the volume of the portion forming the chamber on the discharge side downstream of the duct blower 1, which is the noise source, in the airflow direction in the airflow direction is Since the volume of the part forming the chamber on the suction side upstream of the duct blower 1 is larger than the volume of the passage forming member 6, the air passage forming members 6 of all the

rooms

9a, 9b, 9c, and 9d have the same size. As compared with the case where it is arranged side by side, an increase in device size can be suppressed, and noise can be prevented from being transmitted indoors or outdoors.

In the above description, an example of a configuration including suction-side and discharge-side chambers for each of the air supply and the exhaust was given, but the silencer 2 has a suction side and a discharge chamber for only one of the air supply and the exhaust. Configurations with side chambers are also possible. That is, the muffler 2 can be configured to include at least one chamber on the suction side and one chamber on the discharge side.

Embodiment 2.
FIG. 6 is a cross-sectional view of a silencer according to Embodiment 2. FIG. The muffler 2 according to the second embodiment is similar to the muffler according to the first embodiment in that the air passage component 6 is arranged with a constant thickness on the inner walls of the supply air discharge side chamber 5a and the exhaust discharge side chamber 5c. It differs from device 2. Other parts are the same as those of the muffler 2 according to Embodiment 1, and redundant description will be omitted.

In the silencer 2 according to the second embodiment, similarly to the silencer 2 according to the first embodiment, when compared with the case where the air passage constituent members 6 of all the

rooms

9a, 9b, 9c, and 9d have the same size, An increase in device size can be suppressed, and noise can be prevented from being transmitted indoors or outdoors.

Embodiment 3.
FIG. 7 is a cross-sectional view of a silencer according to Embodiment 3. FIG. The muffler 2 according to Embodiment 3 differs from Embodiment 1 in that the perforated plate 7 is arranged on the surface of the air passage component 6 in the air supply discharge side chamber 5a and the exhaust discharge side chamber 5c. It is different from the muffler 2 according to Other parts are the same as those of the muffler 2 according to the first embodiment, and redundant description will be omitted.

The perforated plate 7 is a resonator-type sound absorbing material in which a plurality of holes are formed at regular intervals. The perforated plate 7 dissipates sound of a specific frequency determined by the diameter of the perforations. The muffler 2 according to the third embodiment can make the muffling effect for the sound of a specific frequency determined by the diameter of the hole of the perforated plate 7 higher than that of the muffler 2 according to the first embodiment.

The configuration shown in the above embodiment shows an example of the contents, and it is possible to combine it with another known technique, and part of the configuration is omitted or changed without departing from the scope. is also possible.

1 duct blower, 1a supply air inlet, 1b air supply outlet, 1c exhaust air inlet, 1d exhaust outlet, 3a outlet, 3b air inlet, 2 silencer, 4 partition plate, 5a air supply discharge side chamber, 5b Air supply suction side chamber, 5c Exhaust discharge side chamber, 5d Exhaust suction side chamber, 6 Air passage component, 6a First sound deadening material, 6b Second sound deadening material, 7 Plate with holes, 8 Housing, 8a Second 1st side, 8b Second side, 9a, 9b, 9c, 9d Room.

Claims

A silencer connected to a ventilation device that supplies and exhausts air,
a rectangular parallelepiped box-shaped housing;
An air intake side chamber installed in the housing and connected to the intake air passage on the air supply side of the ventilator, and an air supply discharge side chamber connected to the air supply side discharge air passage of the ventilator. and an exhaust intake side chamber connected to the exhaust side intake air path of the ventilation device, and an exhaust discharge side chamber connected to the exhaust side discharge air path of the ventilation device are formed in the housing. a component,
A volume of a portion of the air passage forming member forming the air supply discharge side chamber is larger than a volume of a portion of the air passage forming member forming the air supply suction side chamber,
A muffler, wherein a volume of a portion of the air passage forming member forming the exhaust discharge side chamber is larger than a volume of a portion forming the exhaust air suction side chamber of the air passage forming member.
The air supply/discharge side chamber has a suction port and a discharge port formed on two surfaces facing each other of the housing,
2. The muffler according to claim 1, wherein the suction port and the discharge port of the air supply discharge side chamber are positioned at different positions in a plane parallel to the two planes.
The exhaust discharge side chamber has a suction port and a discharge port formed on the two surfaces,
3. The muffler according to claim 2, wherein positions of the suction port and the discharge port of the exhaust discharge side chamber are different from each other in a plane parallel to the two planes.
Each of the exhaust suction side chamber and the supply air suction side chamber has a suction port and a discharge port formed on the two surfaces,
4. The muffler according to claim 3, wherein the suction port and the discharge port of each of the exhaust suction side chamber and the supply air suction side chamber are located at the same position in a plane parallel to the two planes. .
5. The air supply suction side chamber and the exhaust suction side chamber according to claim 1, wherein the cross-sectional area of the air passage between the suction port and the discharge port is constant. Silencer.
The muffler according to any one of claims 1 to 5, wherein the air supply discharge side chamber and the exhaust discharge side chamber have straight air passages between the suction port and the discharge port. .
The muffler according to any one of claims 1 to 6, wherein a portion of the air passage component forming the air supply discharge side chamber is a porous sound absorbing material.
The air passage component includes a first sound deadening material that forms the air supply discharge side chamber and the exhaust discharge side chamber, and a second sound deadening material that forms the air supply intake side chamber and the exhaust air intake side chamber. with
The first sound-absorbing material is a porous sound-absorbing material,
7. A muffler according to any one of claims 1 to 6, wherein said second muffling material is plastic foam.
The muffler according to any one of claims 1 to 8, characterized in that a resonator-type sound absorbing material is installed at least in the air supply discharge side chamber.